MAX604CSA+T - Maxim Integrated

General Description

The MAX603/MAX604 low-dropout, low quiescent current,

linear regulators supply 5V, 3.3V, or an adjustable output

for currents up to 500mA. They are available in a 1.8W SO

package. Typical dropouts are 320mV at 5V and 500mA,

or 240mV at 3.3V and 200mA. Quiescent currents are

15μA typ and 35μA max. Shutdown turns off all circuitry

and puts the regulator in a 2μA off mode. A unique protection

scheme limits reverse currents when the input voltage falls

below the output. Other features include foldback current

limiting and thermal overload protection.

The output is preset at 3.3V for the MAX604 and 5V

for the MAX603. In addition, both devices employ Dual

Mode™ operation, allowing user-adjustable outputs from

1.25V to 11V using external resistors. The input voltage

supply range is 2.7V to 11.5V.

The MAX603/MAX604 feature a 500mA P-channel

MOSFET pass transistor. This transistor allows the devices

to draw less than 35μA over temperature, independent

of the output current. The supply current remains low

because the P-channel MOSFET pass transistor draws

no base currents (unlike the PNP transistors of conventional

bipolar linear regulators). Also, when the input-to-output

voltage differential becomes small, the internal P-channel

MOSFET does not suffer from excessive base current

losses that occur with saturated PNP transistors.

Features

●500mA Output Current, with Foldback Current

Limiting

●High-Power (1.8W) 8-Pin SO Package

● Dual Mode™ Operation: Fixed or Adjustable Output

from 1.25V to 11V

●Large Input Range (2.7V to 11.5V)

●Internal 500mA P-Channel Pass Transistor

● 15μA Typical Quiescent Current

● 2μA (Max) Shutdown Mode

●Thermal Overload Protection

●Reverse-Current Protection

Applications

●5V and 3.3V Regulators

●1.25V to 11V Adjustable Regulators

●Battery-Powered Devices

●Pagers and Cellular Phones

●Portable Instruments

●Solar-Powered Instruments

Ordering Information appears at end of data sheet.

19-0269; Rev 1; 4/17

Dual Mode is a trademark of Maxim Integrated Products.

MAX603

MAX604

OUT

SETGND

OFF COUT

10µF

CIN

10µF

BATTERY

OUTPUT

VOLTAGE

OUT

GND

SET

GND

OFF

MAX603

MAX604

DIP/SO

TOP VIEW

MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

Typical Operating Circuit Pin Conguration

Supply Voltage (IN or OUT to GND) .....................-0.3V to +12V

Output Short-Circuit Duration ............................................. 1 min

Continuous Output Current ..............................................600mA

SET, OFF Input Voltages .......................... -0.3V to the greater of

(IN + 0.3V) or (OUT + 0.3V)

Continuous Power Dissipation (TA = +70°C)

Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW

SO (derate 23.6mW/°C above +70°C) ............................1.8W

CERDIP (derate 8.00mW/°C above +70°C) ................640mW

Operating Temperature Ranges

MAX60_C_A .......................................................0°C to +70°C

MAX60_E_A ................................................... -40°C to +85°C

MAX60_MJA ................................................. -55°C to +125°C

Junction Temperature ...................................................... +150°C

Storage Temperature Range ............................ -65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

(VIN = 6V (MAX603) or 4.3V (MAX604), CIN = COUT = 10μF, OFF = VIN, SET = GND, TJ = TMIN to TMAX, unless otherwise noted.

Typical values are at TJ = +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Voltage VIN SET = OUT, RL = 1kΩ

MAX60_C 2.7 11.5

VMAX60_E 2.9 11.5

MAX60_M 3.0 11.5

Output Voltage (Note 2) VOUT

IOUT = 20μA to 500mA,

6.0V < VIN < 11.5V MAX603 4.75 5.00 5.25

IOUT = 20μA to 300mA,

4.3V < VIN < 11.5V MAX604 3.15 3.30 3.45

Load Regulation ∆VLDR

IOUT = 1mA to 500mA MAX603C/E 60 100

mVMAX603M 150

IOUT = 1mA to 300mA MAX604 30 100

Line Regulation ∆VLNR (VOUT + 0.5V) ≤ VIN ≤ 11.5V, IOUT = 25mA 7 40 mV

Dropout Voltage (Note 3) ∆VDO

IOUT = 200mA MAX603 130 220

IOUT = 500mA 320 550

IOUT = 200mA MAX604 240 410

IOUT = 400mA 480 820

Quiescent Current IQ3.0V ≤ VIN ≤ 11.5V, SET = OUT MAX60_C/E 15 35 μA

MAX60_M 40

OFF Quiescent Current IQ OFF

OFF ≤ 0.4V, RL = 1kΩ,

(VOUT + 1V) ≤ VIN ≤ 11.5V

MAX60_C 0.01 2

µAMAX60_E 10

MAX60_M 20

Minimum Load Current IOUT MIN VIN = 11.5V, SET = OUT

MAX60_C 2

µAMAX60_E 6

MAX60_M 20

Foldback Current Limit

(Note 4) ILIM

VOUT < 0.8V 350 mA

VOUT > 0.8V and VIN - VOUT > 0.7V 1200

Thermal Shutdown Temperature TSD 160 °C

Thermal Shutdown Hysteresis ∆TSD 10 °C

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MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

Electrical Characteristics

(VIN = 6V (MAX603) or 4.3V (MAX604), CIN = COUT = 10μF, OFF = VIN, SET = GND, TJ = TMIN to TMAX, unless otherwise noted.

Typical values are at TJ = +25°C.) (Note 1)

Note 1: Electrical specifications are measured by pulse testing and are guaranteed for a junction temperature (TJ) equal to the

operating temperature range. C and E grade parts may be operated up to a TJ of +125°. Expect performance similar to M

grade specifications. For TJ between +125°C and +150°C, the output voltage may drift more.

Note 2: (VIN - VOUT) is limited to keep the product (IOUT x (VIN - VOUT)) from exceeding the package power dissipation limits.

Note 3: Dropout Voltage is (VIN - VOUT) when VOUT falls to 100mV below its nominal value at VIN = VOUT + 2V. For example, the

MAX603 is tested by measuring the VOUT at VIN = 7V, then VIN is lowered until VOUT falls 100mV below the measured

value. The difference (VIN - VOUT) is then measured and defined as ∆VDO.

Note 4: Foldback Current Limit was characterized by pulse testing to remain below the maximum junction temperature.

Note 5: The Reverse-Current Protection Threshold is the output/input differential voltage (VOUT - VIN) at which reverse-current

protection switchover occurs and the pass transistor is turned off.

Note 6: Noise is tested using a bandpass amplifier with two poles at 10Hz and two poles at 10kHz.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reverse-Current Protection

Threshold (Note 5) ∆VRTH

VOUT = 4.5V MAX603 6 20 mV

VOUT = 3.0V MAX604 6 20

Reverse Leakage Current IRVL

VIN = 0V, VOUT = 4.5V

(MAX603) VOUT = 3.0V

(MAX604)

MAX60_C 0.01 10

µAMAX60_E 20

MAX60_M 100

Start-Up Overshoot VOSH RL = 1kΩ, COUT = 10μF, OFF rise time ≤ 1μs 2 %VOUT

Time Required to Exit Shutdown tSTART VIN = 9V, RL = 18Ω, VOFF switched from

0V to VIN, time from 0% to 95% of VOUT 200 µs

Dual-Mode SET Threshold VSET TH

For internal feedback 80 30 mV

For external feedback 150 80

SET Reference Voltage VSET SET = OUT, RL = 1kΩ 1.16 1.20 1.24 V

SET Input Leakage Current ISET VSET = 1.5V or 0V ±0.01 ±10 nA

OUT Leakage Current IOUT LKG VIN = 11.5V, VOUT = 2V,

SET = OUT

MAX60_C 0.01 2

μA

MAX60_E 6

MAX60_M 20

OFF Threshold Voltage

VIL OFF Off 0.4

VIH OFF

On, SET = OUT, VIN = 4V 2.0

VOn, SET = OUT, VIN = 6V 3.0

On, SET = OUT, VIN = 11.5V 4.0

OFF Input Leakage Current IOFF VOFF = VIN or GND ±0.01 ±10 nA

Output Noise (Note 6) en10Hz to 10kHz, SET = OUT, RL = 1kΩ,

COUT = 10μF 250 μVRMS

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MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

Electrical Characteristics (continued)

(VIN = 7V for MAX603, VIN = 5.3V for MAX604,

OFF

= VIN, SET = GND, CIN = COUT = 10μF, RL = 1kΩ, TJ = +25°C, unless otherwise noted.)

1.00

1.01

0.95

0.1 10 700

OUTPUT VOLTAGE vs. LOAD CURRENT

0.96

MAX603/4-TOC-01

LOAD CURRENT (mA)

NORMALIZED OUTPUT VOLTAGE

0.97

0.98

0.99

1 100

VOUT = 3.3V, 5V, 10V

NORMALIZED TO

OUTPUT VOLTAGE

AT 1mA

0.1 10 700

QUIESCENT CURRENT vs. LOAD CURRENT

MAX603/4-TOC-02

LOAD CURRENT (mA)

QUIESCENT CURRENT (µA)

1 100

UPWARD CURVE IS

THERMAL EFFECT

MAX603, VIN = 12V, VOUT = 10V

MAX603, VIN = 7V, VOUT = 5V

MAX604, VIN = 5.3V, VOUT = 3.3V

OUTPUT VOLTAGE AND

QUIESCENT CURRENT vs. SUPPLY VOLTAGE

MAX1603/4 TOC-03

SUPPLY VOLTAGE (V)

OUTPUT VOLTAGE (V)

QUIESCENT CURRENT (µA)

4 6 12

3 95 7 11

, MAX604

IQ, MAX603

MAX604, VOUT = 3.3V

MAX603, VOUT = 5V

100

101

102

103

104

-55 45 125

OUTPUT VOLTAGE vs.

TEMPERATURE

MAX603/4-TOC-04

TEMPERATURE (°C)

NORMALIZED OUTPUT VOLTAGE (%)

5-35 856525-15 105

-55 45 125

QUIESCENT CURRENT vs.

TEMPERATURE

MAX603/4-TOC-05

TEMPERATURE (°C)

QUIESCENT CURRENT (µA)

5-35 856525-15 105

MAX603

MAX604

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

0 500

DROPOUT VOLTAGE vs. LOAD CURRENT

MAX603/4-TOC-06

LOAD CURRENT (mA)

DROPOUT VOLTAGE (V)

300100 700600400200

MAX604

VOUT = 3.3V

MAX603

VOUT = 5V

MAX603, VOUT = 10V,

SET EXTERNALLY

DS(ON)

= 0.4Ω

RDS(ON) = 0.65Ω

DS(ON)

= 1.2Ω

10ms/div

10Hz TO 10kHz OUTPUT NOISE

OUTPUT NOISE (1mV/div)

MAX603

VOUT = 5V

2ms/div

LINE-TRANSIENT RESPONSE

A: VIN = 8V (HIGH), VIN = 7V (LOW)

B: OUTPUT VOLTAGE (50mV/div)

MAX603

VOUT = 5V

tR = 10µs, tF = 70µs

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MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

Typical Operating Characteristics

(VIN = 7V for MAX603, VIN = 5.3V for MAX604,

OFF

= VIN, SET = GND, CIN = COUT = 10μF, RL = 1kΩ, TJ = +25°C, unless otherwise noted.)

Figure 1. Test Circuit

NAME

DESCRIPTION

1 IN

Regulator Input. Supply voltage can range from 2.7V to 11.5V.

2, 3, 6,

7 GND

Ground. These pins function as heatsinks, only in the SOIC

package.

All GND pins must be soldered to

the

circuit board for proper power dissipation. Connect to large copper pads or planes to channel heat from the IC.

OFF Shutdown, active low. Switch logic levels in less than 1µs with the high level above the

OFF

threshold.

SET Feedback for Setting the Output Voltage. Connect to GND to set the output voltage to the preselected 3.3V

or 5V. Connect to an external resistor network for adjustable output

operation.

OUT Regulator Output. Fixed or adjustable from

1.25V

11.0V.

Sources up to 500mA for input voltages above 4V.

2ms/div

LOAD-TRANSIENT RESPONSE

A: OUTPUT VOLTAGE (100mV/div)

B: IOUT = 500mA (HIGH), IOUT = 5mA (LOW)

MAX603

VOUT = 5V

500µs/div

OVERSHOOT AND TIME

EXITING SHUTDOWN MODE

A: OFF PIN VOLTAGE (1V/div)

RISE TIME = 13µs

B: MAX603 OUTPUT VOLTAGE (1V/div)

DELAY = 4.936ms, OVERSHOOT = 1%, RISE TIME = 55µs

MAX603

MAX604 OUT

GND

SET

OFF

COUT

10µF

CIN

10µF

VIN

VOUT

GND

GND R1

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MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

Typical Operating Characteristics (continued)

Pin Description

Detailed Description

The MAX603/MAX604 are low-dropout, low-quiescent-

current linear regulators designed primarily for battery-

powered applications. They supply an adjustable 1.25V

to 11V output or a preselected 5V (MAX603) or 3.3V

(MAX604) output for load currents up to P-channel. As

illustrated in Figure 2, they consist of a 1.20V reference,

error amplifier, MOSFET driver, P-channel pass transis-

tor, dual-mode comparator, and internal feedback voltage

divider.

The 1.20V bandgap reference is connected to the error

amplifier’s inverting input. The error amplifier compares

this reference with the selected feedback voltage and

amplifies the difference. The MOSFET driver reads the

error signal and applies the appropriate drive to the

P-channel pass transistor. If the feedback voltage is lower

than the reference, the pass transistor gate is pulled

lower, allowing more current to pass and increasing the

output voltage. If the feedback voltage is too high, the

pass transistor gate is pulled up, allowing less current to

pass to the output.

The output voltage is fed back through either an internal

resistor voltage divider connected to the OUT pin, or

an external resistor network connected to the SET pin.

The dual-mode comparator examines the SET voltage

and selects the feedback path used. If SET is below

80mV, internal feedback is used and the output voltage is

regulated to 5V for the MAX603 or 3.3V for the MAX604.

Additional blocks include a foldback current limiter, reverse

current protection, thermal sensor, and shutdown logic.

Internal P-Channel Pass Transistor

The MAX603/MAX604 feature a 500mA P-channel

MOSFET pass transistor. This provides several advan-

tages over similar designs using PNP pass transistors,

including longer battery life.

The P-channel MOSFET requires no base drive, which

reduces quiescent current considerably. PNP based regu-

lators waste considerable amounts of current in dropout

when the pass transistor saturates. They also use high

base-drive currents under large loads. The MAX603/

MAX604 do not suffer from these problems and consume

only 15μA of quiescent current under light and heavy

loads, as well as in dropout.

Figure 2. Functional Diagram

MOSFET DRIVER

WITH FOLDBACK

CURRENT LIMIT

THERMAL

SENSOR

SHUTDOWN

LOGIC

1.20V

REFERENCE DUAL-MODE

COMPARATOR

OUT

SET

REVERSE

CURRENT

PROTECTION

80mV

ERROR AMP

OFF

GND MAX603

MAX604

SHUTDOWN

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MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

Output Voltage Selection

The MAX603/MAX604 feature dual-mode operation. In

preset voltage mode, the output of the MAX603 is set

to 5V and the output of the MAX604 is set to 3.3V using

internal, trimmed feedback resistors. Select this mode by

connecting SET to ground.

In adjustable mode, an output between 1.25V and 11V is

selected using two external resistors connected as a volt-

age divider to SET (Figure 3). The output voltage is set by

the following equation:

OUT SET

V V1



= +





where VSET = 1.20V. To simplify resistor selection:

OUT

SET

R1 R2 1



= −





Since the input bias current at SET is nominally zero,

large resistance values can be used for R1 and R2 to

minimize power consumption without losing accuracy. Up

to 1.5MΩ is acceptable for R2. Since the VSET tolerance

is less than ±40mV, the output can be set using fixed

resistors instead of trim pots.

In preset voltage mode, impedances between SET and

ground should be less than 10kΩ. Otherwise, spurious

conditions could cause the voltage at SET to exceed the

80mV dual-mode threshold.

Shutdown

A low input on the OFF pin shuts down the MAX603/

MAX604. In the off mode, the pass transistor, control cir-

cuit, reference, and all biases are turned off, reducing the

supply current below 2μA. OFF should be connected to IN

for normal operation.

Use a fast comparator, Schmitt trigger, or CMOS or TTL

logic to drive the OFF pin in and out of shutdown. Rise

times should be shorter than 1μs. Do not use slow RC cir-

cuits, leave OFF open, or allow the input to linger between

thresholds; these measures will prevent the output from

jumping to the positive supply rail in response to an inde-

terminate input state.

Since the OFF threshold varies with input supply voltage

(see Electrical Characteristics), do not derive the drive

voltage from 3.3V logic. With VIN at 11.5V, the high OFF

logic level needs to be above 4V.

Foldback Current Limiting

The MAX603/MAX604 also include a foldback current

limiter. It monitors and controls the pass transistor’s gate

voltage, estimating the output current and limiting it to 1.2A

for output voltages above 0.8V and VIN - VOUT > 0.7V.

For VIN - VOUT < 0.7V (dropout operation), there is no

current limit. If the output voltage drops below 0.8V, imply-

ing a short-circuit condition, the output current is limited

to 350mA. The output can be shorted to ground for one

minute without damaging the device if the package can

dissipate VIN x 350mA without exceeding TJ = +150°C.

Thermal Overload Protection

Thermal overload protection limits total power dissipation

in the MAX603/MAX604. When the junction temperature

exceeds TJ = +160°C, the thermal sensor sends a signal

to the shutdown logic, turning off the pass transistor and

allowing the IC to cool. The thermal sensor will turn the

pass transistor on again after the IC’s junction tempera-

ture cools by 10°C, resulting in a pulsed output during

thermal overload conditions.

Thermal overload protection is designed to protect the

MAX603/MAX604 in the event of fault conditions. For

continual operation, the absolute maximum junction tem-

perature rating of TJ = +150°C should not be exceeded.

Operating Region and Power Dissipation

Maximum power dissipation of the MAX603/MAX604

depends on the thermal resistance of the case and circuit

board, the temperature difference between the die junc-

tion and ambient air, and the rate of air flow. The power

dissipation across the device is P = IOUT (VIN - VOUT).

The resulting maximum power dissipation is:

( )

MAX JB BA

P

−

=



θ +θ



where (TJ - TA) is the temperature difference between the

MAX603/MAX604 die junction and the surrounding air, θJB

Figure 3. Adjustable Output Using External Feedback Resistors

MAX603

MAX604

OUT

SET

GND

OFF COUT

10µF

CIN

0.1µF to

10µF

BATTERY

OUTPUT

VOLTAGE

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MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

(or θJC) is the thermal resistance of the package chosen,

and θBA is the thermal resistance through the printed cir-

cuit board, copper traces and other materials to the sur-

rounding air. The 8-pin SOIC package for the MAX603/

MAX604 features a special lead frame with a lower thermal

resistance and higher allowable power dissipation. The

thermal resistance of this package is θJB = 42°C/W, com-

pared with θJB = 110°C/W for an 8-pin plastic DIP package

and θJB = 125°C/W for an 8-pin ceramic DIP package.

The GND pins of the MAX603/MAX604 SOIC package

perform the dual function of providing an electrical con-

nection to ground and channeling heat away. Connect all

GND pins to ground using a large pad or ground plane.

Where this is impossible, place a copper plane on an

adjacent layer. The pad should exceed the dimensions

in Figure 4.

Figure 4 assumes the IC is an 8-pin SOIC package, is sol-

dered directly to the pad, has a +125°C maximum junction

temperature and a +25°C ambient air temperature, and

has no other heat sources. Use larger pad sizes for other

packages, lower junction temperatures, higher ambient

temperatures, or conditions where the IC is not soldered

directly to the heat-sinking ground pad.

The MAX603/MAX604 can regulate currents up to 500mA

and operate with input voltages up to 11.5V, but not simul-

taneously. High output currents can only be sustained

when input-output differential voltages are low, as shown

in Figure 5. Maximum power dissipation depends on

packaging, board layout, temperature, and air flow. The

maximum output current is:

( )

MAX J A

OUT(max)

IN OUT

P TT

IV V 100 C

×−

=− ×°

where PMAX is derived from Figure 4.

Reverse-Current Protection

The MAX603/MAX604 has a unique protection scheme

that limits reverse currents when the input voltage falls

below the output. It monitors the voltages on IN and OUT

Figure 4. Typical Maximum Power Dissipation vs. Ground Pad

Size.

Figure 5. Power Operating Regions: Maximum Output Current

vs. Differential Supply Voltage

1.0

10.2 10 20

6.51.3

(in2)

(cm2)65 130

POWER DISSIPATION vs.

GROUND PAD AREA

1.2

MAX603/4 FIG 4

COPPER GROUND PAD AREA

POWER DISSIPATION (W)

1.4

1.6

1.8

1.1

1.3

1.5

1.7

MAX603, VOUT = 5V

8-PIN SO PACKAGE

PAPER EPOXY BOARD

SINGLE SIDED

1oz. COPPER

TJ = +125°C

TA = +25°C STILL AIR

100

200

300

400

500

600

700

2 7

MAX604

MAX603/4-FIG-04B

SUPPLY VOLTAGE (V)

MAXIMUM OUTPUT CURRENT (mA)

53 98 10 121164 13

CERAMIC DIP

PLASTIC DIP

HIGH-POWER SOIC

MAXIMUM SUPPLY VOLTAGE LIMIT

TYPICAL DROPOUT VOLTAGE LIMIT

MAXIMUM CONTINUOUS CURRENT LIMIT

OPERATING

REGION AT

TA = +25°C

TJ = +125°C

100

200

300

400

500

600

700

MAX603

MAXIMUM OUTPUT CURRENT vs. SUPPLY VOLTAGE

MAX603/4-FIG-04A

SUPPLY VOLTAGE (V)

MAXIMUM OUTPUT CURRENT (mA)

5 98 10 121164 13

CERAMIC DIP

PLASTIC DIP

HIGH-POWER

SOIC

MAXIMUM SUPPLY VOLTAGE LIMIT

TYPICAL DROPOUT VOLTAGE LIMIT

MAXIMUM CONTINUOUS CURRENT LIMIT

OPERATING

REGION AT

TA = +25°C

TJ = +125°C

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MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

and switches the IC’s substrate and power bus to the

more positive of the two. The control circuitry can then

remain functioning and turn the pass transistor off, limit-

ing reverse currents back through the device. This feature

allows a backup regulator or battery pack to maintain

VOUT when the supply at IN fails.

Reverse-current protection activates when the voltage on

IN falls 6mV (20mV maximum) below the voltage on OUT.

Before this happens, currents as high as several milliam-

peres can flow back through the device. After switchover,

typical reverse currents are limited to 0.01μA for as long

as the condition exists.

Applications Information

Figure 6 illustrates the typical application for the MAX603/

MAX604.

Capacitor Selection and

Regulator Stability

Normally, use 0.1μF to 10μF capacitors on the input and

10μF on the output of the MAX603/MAX604. The larger

input capacitor values provide better supply-noise rejec-

tion and line-transient response. Improve load-transient

response, stability, and power-supply rejection by using

large output capacitors. For stable operation over the full

temperature range and with load currents up to 500mA,

10μF is recommended. Using capacitors smaller than

3.3μF can result in oscillation.

Noise

The MAX603/MAX604 exhibit 3mVP-P to 4mVP-P of

noise during normal operation. This is negligible in most

applications. When using the MAX603/MAX604 in appli-

cations that include analog-to-digital converters of greater

than 12 bits, consider the ADC’s power-supply rejection

specifications. Refer to the output noise plot in the Typical

Operating Characteristics.

PSRR and Operation from Sources

Other than Batteries

The MAX603/MAX604 are designed to deliver low dropout

voltages and low quiescent currents in battery-powered

systems. Achieving these objectives requires trading off

power-supply noise rejection and swift response to sup-

ply variations and load transients. Power-supply rejection

is 80dB at low frequencies and rolls off above 10Hz. As

the frequency increases above 10kHz, the output capaci-

tor is the major contributor to the rejection of power-

supply noise (Figure 7). Do not use power supplies with

ripple above 100kHz, especially when the ripple exceeds

100mVP-P. When operating from sources other than

batteries, improved supply-noise rejection and transient

response can be achieved by increasing the values of the

input and output capacitors, and through passive filtering

techniques. The Typical Operating Characteristics show the

MAX603/MAX604 supply and load-transient responses.

Transient Considerations

The Typical Operating Characteristics show the MAX603/

MAX604 load-transient response. Two components of the

output response can be observed on the load-transient

graphs—a DC shift from the output impedance due to the

different load currents, and the transient response. Typical

transients for step changes in the load current from 5mA

to 500mA are 0.2V. Increasing the output capacitor’s value

attenuates transient spikes.

Figure 6. 3.3V or 5V Linear-Regulator Application

Figure 7. Power-Supply Rejection Ratio vs. Ripple Frequency

MAX603

MAX604

OUT

SETGND

OFF COUT

10µF

CINBATTERY

OUTPUT

VOLTAGE

100101102103104105106

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX603/4-FIG-06

FREQUENCY (Hz)

PSRR (dB)

IOUT = 1mA

IOUT = 100mA

VIN = 1Vp-p

FOR f < 400kHz

CIN = 0µF

COUT = 10µF

www.maximintegrated.com Maxim Integrated

│

MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

Input-Output (Dropout) Voltage

A regulator’s minimum input-output voltage differential, or

dropout voltage, determines the lowest usable supply volt-

age. In battery-powered systems, this will determine the

useful end-of-life battery voltage. Because the MAX603/

MAX604 use a P-channel MOSFET pass transistor, their

dropout voltage is a function of rDS(ON) multiplied by the

load current (see Electrical Characteristics).

Quickly stepping up the input voltage from the dropout

voltage can result in overshoot. This occurs when the

pass transistor is fully on at dropout and the IC is not

given time to respond to the supply voltage change.

Prevent this by slowing the input voltage rise time.

TRANSISTOR COUNT: 111

NO DIRECT SUBSTRATE CONNECTION. THE N-SUBSTRATE

IS INTERNALLY SWITCHED BETWEEN THE MORE POSITIVE

OF IN OR OUT.

0.100"

(2.54mm)

0.104"

(2.64mm)

OFF GND SET

OUT

www.maximintegrated.com Maxim Integrated

│

MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

Chip Topography

Package Information

For the latest package outline information and land patterns (foot-

prints), go to www.maximintegrated.com/packages. Note that

a “+”, “#”, or “-” in the package code indicates RoHS status only.

Package drawings may show a different suffix character, but the

drawing pertains to the package regardless of RoHS status.

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND PATTERN

NO.

8 PDIP P8+3 21-0043 —

8 SOIC S8-7F 21-0041 90-0096

8 CDIP J8-3 —–

* Dice are tested at TA = +25°C, DC parameters only.

** Contact factory for availability.

PART TEMP. RANGE PIN-PACKAGE

MAX603CPA 0°C to +70°C 8 Plastic DIP

MAX603CSA 0°C to +70°C 8 SO

MAX603C/D 0°C to +70°C Dice*

MAX603EPA -40°C to +85°C 8 Plastic DIP

MAX603ESA -40°C to +85°C 8 SO

MAX603MSA/PR+T -55°C to +125°C 8 SO

MAX604CPA 0°C to +70°C 8 Plastic DIP

MAX604CSA 0°C to +70°C 8 SO

MAX604C/D 0°C to +70°C Dice*

MAX604EPA -40°C to +85°C 8 Plastic DIP

MAX604ESA -40°C to +85°C 8 SO

Ordering Information

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 9/94 Initial Release —

1 4/17 Updated Ordering Information table 10

Revision History

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)

shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

│

MAX603/MAX604 5V/3.3V or Adjustable, Low-Dropout,

Low IQ, 500mA Linear Regulators

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

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Maxim Integrated:

MAX603CPA+ MAX603CSA+ MAX603ESA+ MAX604CPA+ MAX604CSA+ MAX604ESA+ MAX603CSA+T

MAX603EPA+ MAX603ESA+T MAX604CSA+T MAX604EPA+ MAX604ESA MAX604ESA+T MAX604ESA-T

MAX603CSA-T MAX603CPA MAX603CSA MAX603ESA MAX603ESA-T MAX604CSA MAX604CSA-T