MIC5232-1.2YD5TR - Micrel, Inc.

MIC5232

10mA Ultra-Low Quiescent Current

µCap LDO

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

General Description

The MIC5232 is an ultra-low quiescent current, low-

dropout linear regulator that is capable of operating

from a single-cell lithium ion battery. Consuming only

1.8µA of quiescent current while operating, the

MIC5232 is ideal for stand-by applications like

powering real-time clocks or memory in battery

operated electronics.

The MIC5232 is capable of providing 10mA of output

current and has low output noise, providing a small,

efficient solution ideal for any keep-alive application.

Including reverse current protection, keeping reverse

leakage (VOUT > VIN) down to 20nA.

The MIC5232 is a µCap design, operating with very

small ceramic output capacitors for stability, reducing

required board space and component cost.

The MIC5232 is available in fixed output voltages in

the miniature 6-pin 2mm x 2mm MLF® package and

thin SOT-23-5 package with an operating junction

temperature range of -40°C to 125°C.

Features

• Input voltage range: 2.7V to 7.0V

• Ultra-low Iq: Only 1.8µA operating current

• Stable with 0.47µF ceramic output capacitor

• Low dropout voltage of 100mV @ 10mA

• Reverse Battery Protection

• High output accuracy:

– +2.0% initial accuracy

– +3.0% over temperature

• Logic-Level Enable Input

• Miniature 6-pin 2mm x 2mm MLF® package

• Lead-Free Thin SOT-23-5 Package

• Tight Load and Line Regulation

Applications

• Real-Time Clock Power Supply

• Stand-by Power Supply

• SRAM Memory Back-up Supply

• Cellular Telephones and Notebook Computers

Typical Application

VIN VOUT

GND

MIC5232-1.2YD5

VOUT

VIN

3.6V 1.2V

0.47µF

ceramic

1µF

1.5 Real-Time Clock Back-up Supply 0

0.3

0.6

0.9

1.2

1.5

1.8

2.1

2.4

2.7

3.0

2.5 3 3.5 4 4.5 5 5.5 6 6.5 7

INPUT VOLTAGE (V)

Ground Pin Current

vs. Input Voltage

VOUT = 1.2V

IOUT = 100µA

COUT = 0.47µF

September 2008 M9999-090508-

Micrel, Inc. MIC5232

September 2008 2 M9999-090508-

Block Diagram

Ordering Information

Part Number Marking

Code(1)

Voltage(2) Junction

Temperature Range

Package Lead Finish

MIC5232-1.2YD5 ZA12 1.2V –40°C to +125°C TSOT-23-5 Pb-Free

MIC5232-2.5YD5 ZA25 2.5V –40°C to +125°C TSOT-23-5 Pb-Free

MIC5232-2.8YD5 ZA28 2.8V –40°C to +125°C TSOT-23-5 Pb-Free

MIC5232-3.3YD5 ZA33 3.3V –40°C to +125°C TSOT-23-5 Pb-Free

MIC5232-1.2YML 12Z 1.2V –40°C to +125°C 6-Pin 2mm x 2mm MLF®(3) Pb-Free

MIC5232-2.5YML 25Z 2.5V –40°C to +125°C 6-Pin 2mm x 2mm MLF®(3) Pb-Free

MIC5232-2.8YML 28Z 2.8V –40°C to +125°C 6-Pin 2mm x 2mm MLF®(3) Pb-Free

MIC5232-3.3YML 33Z 3.3V –40°C to +125°C 6-Pin 2mm x 2mm MLF®(3) Pb-Free

Notes:

1. Overbar/Underbar symbol ( / __ ) may not be to scale.

2. Other voltages available. Contact Micrel Inc. for more details.

3. MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Micrel, Inc. MIC5232

September 2008 3 M9999-090508-

Pin Configuration

GND

VIN

VOUT

MIC5232-x.xYML

2mm x 2mm MLF® (ML)

EN GND

NC VOUT

VIN

MIC5232-x.xYD5

TSOT-23-5 (D5)

Pin Description

Pin Number

TSOT-23-5

Pin Number

MLF

Pin Name Pin Name

1 3 VIN Supply Input.

2 2 GND Ground.

3 1 EN Enable Input. Active High. High = on, Low = off. Do not leave floating.

4 5 NC Not Internally Connected.

5 4 VOUT Output (10mA output current).

- 6 NC Not Internally Connected.

- EP EP Exposed pad connected-to-ground.

Micrel, Inc. MIC5232

September 2008 4 M9999-090508-

Absolute Maximum Ratings(1)

Supply Input Voltage (VIN)................................0V to 8V

Enable Input Voltage (VEN)...............................0V to 8V

Power Dissipation (PD) .................... Internally Limited(3)

Junction Temperature (TJ).................. –40°C to +125°C

Storage Temperature (TS).................. –65°C to +150°C

Lead Temperature (soldering, 5 sec.) ................. 260°C

ESD Rating(4)......................................................... ±2kV

Operating Ratings(2)

Supply voltage (VIN) ...................................... 2.7V to 7V

Enable Input voltage (VEN)...............................0V to VIN

Thermal Resistance

TSOT-23-5 (θJA)......................................... 235°C/W

MLF-6 (θJA) .................................................. 90°C/W

Electrical Characteristics(5)

VIN = VOUT + 1.0V, COUT = 0.47µF, IOUT = 100µA, TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.

Parameter Conditions Min Typ Max Units

Variation from nominal VOUT -2.0 +2.0 % Output Voltage Accuracy

Variation from nominal VOUT; -40C to +125C -3.0 +3.0 %

Output Voltage Temp.

Coefficient

40 ppm/C

Line Regulation VIN = VOUT +1V to7V;

0.02

0.25 %/V

Load Regulation IOUT = 10µA to 10mA 0.2 1.0

1.5

Dropout Voltage(6) IOUT = 100µA

IOUT = 10mA

100

300

Ground Pin Current IOUT = 10µA 1.8 3 µA

Ground Pin Current in

Shutdown

VEN < 0.18V 0.1 1.5 µA

Current Limit VOUT = 0V 70

120 mA

Reverse Current (VOUT > VIN) VOUT = VIN + 1V 0.02 1 µA

Ripple Rejection f = 10Hz

f = 1kHz

Output Voltage Noise COUT =0.47µF; 10Hz to 100kHz 400 µVrms

Enable Input

Logic Low (Regulator Shutdown) 0.18 V Enable Input Voltage

Logic High (Regulator Enabled) 1.4 V

VIL < 0.18V (Regulator Shutdown) 1 nA Enable Input Current

VIH > 1.4V (Regulator Enabled) 1 nA

Turn-on Time COUT = 0.47µF(7) 0.75 1.5 ms

Notes:

1. Exceeding the absolute maximum rating may damage the device.

2. The device is not guaranteed to function outside its operating rating.

3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = TJ(max) – TA) / θJA. Exceeding the maximum allowable

power dissipation will result in excessive die temperature.

4. Devices are ESD sensitive. Handling precautions recommended.

5. Specification for packaged product only.

6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below

2.7V, dropout voltage is the input-to-output differential with the minimum input voltage 2.7V.

7. Turn-on time is measured from 10% of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.

Micrel, Inc. MIC5232

September 2008 5 M9999-090508-

Typical Characteristics

0.01 0.1 1 10 100 1000

FREQUENCY (kHz)

Power Supply

Rejection Ratio

VOUT = 3.3V

VIN = VOUT + 1V

IOUT = 100µA

COUT = 0.47µF

100

120

012345678910

DROPOUT VOLTAGE (mV)

OUTPUT CURRENT (mA)

Dropout Voltage

vs. Output Current

VOUT = 3.3V

COUT = 0.47µF

DROPOUT VOLTAGE (mV)

Dropout Voltage

vs. Temperature

VOUT = 3.3V

IOUT = 100µA

COUT = 0.47µF

100120

TEMPERATURE (°C)

100

120

140

160

DROPOUT VOLTAGE (mV)

Dropout Voltage

vs. Temperature

100 120

TEMPERATURE (°C)

VOUT = 3.3V

IOUT = 10mA

COUT = 0.47µF

0.2

0.4

0.6

0.8

1.2

1.4

01234567

INPUT VOLTAGE (V)

Output Voltage

vs. Input Voltage

VOUT = 1.2V

COUT = 0.47µF

100µA

10mA

2.5

2.6

2.7

2.8

2.9

3.1

3.2

3.3

3.4

3.5

Output Voltage

vs. Temperature

100120

TEMPERATURE (°C)

VOUT = 3.3V

VIN = VOUT + 1V

COUT = 0.47µF

012345678910

OUTPUT CURRENT (mA)

Ground Pin Current

vs. Output Current

VOUT = 3.3V

VIN = VOUT + 1V

COUT = 0.47µF

0.3

0.6

0.9

1.2

1.5

1.8

2.1

2.4

2.7

3.0

2.5 3 3.5 4 4.5 5 5.5 6 6.5 7

INPUT VOLTAGE (V)

Ground Pin Current

vs. Input Voltage

VOUT = 1.2V

IOUT = 100µA

COUT = 0.47µF

2.5 3 3.5 4 4.5 5 5.5 6 6.5 7

INPUT VOLTAGE (V)

Ground Pin Current

vs. Input Voltage

VOUT = 1.2V

IOUT = 10mA

COUT = 0.47µF

GROUND CURRENT (µA)

Ground Pin Current

vs. Temperature

100120

TEMPERATURE (°C)

VOUT = 3.3V

VIN = VOUT + 1V

IOUT = 10mA

COUT = 0.47µF

100

2.5 3 3.5 4 4.5 5 5.5 6 6.5 7

INPUT VOLTAGE (V)

Current Limit

vs. Input Voltage

VOUT = 3.3V

COUT = 0.47µF

0.2

0.4

0.6

0.8

ENABLE THRESHOLD (V)

Enable-On Threshold

vs. Temperature

VOUT = 3.3V

VIN = 4.3V

COUT = 0.47µF

100120

TEMPERATURE (°C)

Micrel, Inc. MIC5232

September 2008 6 M9999-090508-

Typical Characteristics (continued)

200

400

600

800

1000

1200

1400

Turn-On Time

100120

TEMPERATURE (°C)

VOUT = 1.2V

VIN = 2.7V

COUT = 0.47µF

IOUT = 100µA

SHORT CUIRCUIT (mA)

Short Circuit Current

vs. Temperature

VOUT = 0V

VIN = 4.3V

COUT = 0.47µF

100120

TEMPERATURE (°C)

100

2.5 3 3.5 4 4.5 5 5.5

(VOUT CURRENT)

OUTPUT VOLTAGE (V)

Reverse Leakage Current

VIN = 2.7V

COUT = 0.47µF

(VOUT > VIN)

REVERSE CURRENT (nA)

1E-02

1E-01

1E-00

1E+01

1E+02

Output Noise

Spectral Density

0.1 100

FREQUENCY (kHz)

VOUT = 1.2V

VIN = 4.3V

ROUT

COUT = 0.47µF

Micrel, Inc. MIC5232

September 2008 7 M9999-090508-

Functional Characteristics

Enabl

Turn-O

Transie

Enable Voltage

(2V/div)

Output Volta

(0.5V/div)

Time (200µs/div)

COUT = 0.47µF

IOUT = 100mA

VOUT = 1.2V

Loa

Transient Respon

Output Current

(5mA/div)

Output Volta

(50mV/div)

Time (100µs/div)

10mA

100µA

COUT = 0.47µF

VOUT = 3.3V

VIN = VOUT + 1V

Lin

Transient Response

Input Volta

(2V/div)

Output Volta

(200mV/div)

Time (200µs/div)

COUT = 0.47µF

IOUT = 1mA

VOUT = 3.3V

Micrel, Inc. MIC5232

September 2008 8 M9999-090508-

Application Information

Input Capacitor

If there is more than 20cm of wire between IN and the

ac filter capacitor or if supplied from a battery, a 1µF

(or larger) capacitor should be placed from the IN

(supply input) to GND (ground).

Output Capacitors

The MIC5232 requires an output capacitor for stability.

A 0.47µF, or larger capacitor, is recommended

between OUT (output) and GND to improve the

regulator’s transient response. A 0.47µF capacitor can

be used to reduce overshoot recovery time at the

expense of overshoot amplitude. The ESR (effective

series resistance) of this capacitor has no effect on

regulator stability, but low-ESR capacitors improve the

high frequency transient response. The value of this

capacitor may be increased without limit, but values

larger than 10µF tend to increase the settling time

after a step change in input voltage or output current.

Minimum Load Current

The MIC5232 does not require a minimum load for

proper operation. This allows the device to operate in

applications where very light output currents are

required for keep-alive purposes. This is important for

powering SRAM or Flash memory in low-power

modes for handheld devices.

Safe Operating Conditions

The MIC5232 incorporates current limit in the design.

There is also reverse circuit protection circuitry built

into the device. The maximum junction temperature

for the device is +125°C, and it is important that this is

not exceeded for any length of time.

Thermal Considerations

The MIC5232 is designed to provide 10mA of

continuous current in a very small package. Maximum

ambient operating temperature can be calculated

based on the output current and the voltage drop

across the part. Given that the input voltage is 4.3V,

the output voltage is 3.3V and the output current =

10mA.

The actual power dissipation of the regulator circuit

can be determined using the equation:

PD = (VIN – VOUT) IOUT + VIN IGND

Because this device is CMOS and the ground current

is typically <15μA over the load range, the power

dissipation contributed by the ground current is < 1%

and can be ignored for this calculation.

D = (4.3V – 3.3V) • 10mA

D = 0.01W

To determine the maximum ambient operating

temperature of the package, use the junction-to-

ambient thermal resistance of the device and the

following basic equation:

−

=(max)

(max)

TJ(max) = 125°C, the max. junction temperature of the

die, θJA thermal resistance = 90°C/W

Table 1 shows junction-to-ambient thermal resistance

for the MIC5232 in the 2mm x 2mm MLF®-6 package.

Package θJA Recommended

Minimum Footprint θJC

2mm x 2mm MLF®-6 90°C/W 2°C/W

Table 1. MLF Thermal Resistance

Substituting PD for PD(max), and solving for the

ambient operating temperature, will give the maximum

operating conditions for the regulator circuit. The

junction-to-ambient thermal resistance for the

minimum footprint is 90°C/W, from Table 1. The

maximum power dissipation must not be exceeded for

proper operation.

For example, when operating the MIC5232-3.3BML at

an input voltage of 4.3V and 10mA load with a

minimum footprint layout, the maximum ambient

operating temperature TA can be determined as

follows:

/90

125

01.0 °

−°

A = 124°C

Therefore, a 3.3V application at 10mA of output

current can accept an ambient operating temperature

of 124°C in a 2mm x 2mm MLF®-6 package. For a full

discussion of heat sinking and thermal effects on

voltage regulators, refer to the “Regulator Thermals”

section of Micrel’s “Designing with Low-Dropout

Voltage Regulators” handbook. This information can

be found on Micrel's website at:

http://www.micrel.com/_PDF/other/LDOBk_ds.pdf

Micrel, Inc. MIC5232

September 2008 9 M9999-090508-

Package Information

5-Pin TSOT-23 (D5)

6-Pin 2mm x 2mm MLF® (ML)

Micrel, Inc. MIC5232

September 2008 10 M9999-090508-

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com

The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for

its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a

product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for

surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant

injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk

and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.