FPF2193 - Fairchild - Pdf.Support

June 2010

FPF2193/4/5 • Rev. 1.0.4

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

FPF2193 / F PF214 / FPF2195

Full-Function Load Switch with Adjustable Current Limit

Features

 <1.8 to 5.5V Input Voltage Range

 Controlled Turn-On

 0.1 to 1.5A Adjustable Current Limit

 Under-Voltage Lockout

 Thermal Shutdown

 <2µA Shutdown Current

 Auto Restart

 Fast Current Limit Response Time

 5µs to Moderate Over Currents

 30ns to Hard Shorts

 Fault Blanking

 Reverse Current Blocking

Applications

 PDAs

 Cell Phones

 Handheld GPS Devices

 Portable Enterprise / Industrial Devices

 Digital Cameras

 Peripheral Ports and Accessories

 Portable Medical Equipment

 Hot Swap Supplies

Description

The FPF2193, FPF2194, and FPF2195 form a series of

load switches that provides full protection to systems

and loads that may encounter large current conditions.

These devices contain a 55mΩ current-limited P-

channel MOSFET that can operate over an input

voltage range of 1.8 to 5.5V. Internally, current is

prevented from flowing when the MOSFET is off and the

output voltage is higher than the input voltage. Switch

control is by a logic input (ON) capable of interfacing

directly with low-voltage control signals. Each part

contains thermal shutdown protection that shuts off the

switch to prevent damage to the part when a continuous

over-current condition causes excessive heating.

When the switch current reaches the current limit, the

parts operate in a constant-current mode to prohibit

excessive currents from causing damage. For the

FPF2193 and FPF2194, if the constant current

condition still persists after 30ms, the parts shut off the

switch and pull the fault signal pin (FLAGB) LOW. The

FPF2193 has an auto-restart feature that turns the

switch on again after 450ms if the ON pin is still active.

The FPF2194 does not have this auto-restart feature,

so the switch remains off until the ON pin is cycled. The

FPF2195 does not turn off after a current limit fault, but

remains in the constant-current mode indefinitely. The

minimum current limit is 100mA.

These parts are available in a space-saving six ball

advanced 1 x 1.5mm WLCSP package.

Ordering Information

Part

Number Current

Limit [mA] Current Limit Blanki ng

Time [ms] Auto-Restart

Time [ms] ON Pin

Activity Top Mark

FPF2193

100-1500

15/30/60 225/450/900

Active HIGH

FPF2194 15/30/60 NA S7

FPF2195 0 NA S9

FPF2193/4/5 • Rev. 1.0.4 2

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Application Diagram

Figure 1. Typical Application

Block Diagram

Figure 2. Functional Block Diagram

FPF2193/4/5 • Rev. 1.0.4 3

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Pin Configuration

Figure 3. 1.0 x 1.5mm Chip-Scale Package

Figure 4. Pin Configuration (Bottom View)

Pin Definitions

Pin # Name Description

C1 ISET Current Limit Set Input. A resistor from ISET to ground sets the current limit for the switch.

B2 VIN Supply Input. Input to the power switch and the supply voltage for the IC.

B1 VOUT Switch Output. Output of the power switch.

A1 FLAGB

Fault Output. Active LOW, open-drain output that indicates an over-current supply, under-

voltage, or over-temperature state.

C2 GND Ground.

A2 ON ON control input, active HIGH.

FPF2193/4/5 • Rev. 1.0.4 4

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be

operable above the recommended operating conditions and stressing the parts to these levels is not recommended.

In addition, extended exposure to stresses above the recommended operating conditions may affect device

reliability. The absolute maximum ratings are stress ratings only.

Symbol Parameter Min. Max. Unit

IN, VOUT, ON, FLAGB, ISET to GND -0.3 6.0 V

PD Power Dissipation at TA = 25°C(1) 1.2 W

TJ Operating Temperature Range -40 +125 °C

TSTG Storage Temperature -65 +150 °C

ΘJA Thermal Resistance, Junction to Ambient 85 °C/W

ESD Electrostatic Discharge Capability Human Body Model, JESD22-A114 8000 V

Machine Model, JESD22-A115 400

Notes:

1. Package power dissipation on one-square inch pad, two-ounce copper board.

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended

operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not

recommend exceeding them or designing to Absolute Maximum Ratings.

Symbol Parameter Min. Max. Unit

VIN Input Voltage 1.8 5.5 V

TA Ambient Operating Temperature -40 +85 °C

FPF2193/4/5 • Rev. 1.0.4 5

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Electrical Characteristics

VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C.

Symbol Parameter Conditions Min. Typ. Max. Units

Basic Operation

VIN Operating Voltage 1.8 5.5 V

IQ Quiescent Current IOUT=0mA, VON=VIN

VIN=1.8V 70

µA

VIN=3.3V 75

VIN=5.5V 80

RON On Resistance TA=25°C, IOUT=200mA 55 80

mΩ

TA=-40 to 85°C, IOUT=200mA 135

VIH On Input Logic High Voltage

VIN=1.8V 0.8

VIN=5.5V 1.4

VIL On Input Logic Low Voltage VIN=1.8V 0.5

VIN=%.5V 1.0

On Input Leakage VON=VIN or GND -1 0 1 µA

IN Shutdown Current VON=0V, VIN=5.5V,

VOUT=Short to GND -2 2 µA

VFLB_L FLAGB Output Logic Low

Voltage

VIN=5V, ISINK=10mA 0.05 0.20

VIN=1.8, ISINK=10mA 0.12 0.30

VFLB_H FLAGB Output Logic High

Leakage Current VIN=5V, Switch ON 1 µA

Reverse Block

ISDT V

OUT Shutdown Current VON=0V, VOUT=5.5V,

VIN=Short-to-GND -2 2 µA

Vbreakdown Reverse Breakdown Voltage VIN=VON=0V, IOUT=200µA 9 V

Protections

ILIM Current Limit VIN=3.3V, VOUT=3.0V, RSET=690Ω 600 800 1000 mA

ILIM(MIN) Minimum Current Limit VIN=3.3V, VOUT=3.0V 100 ma

TSD Thermal Shutdown

Shutdown Threshold 140

°C Return from Shutdown 130

Hysteresis 10

VUVLO Under-Voltage Lockout VIN Increasing 1.55 1.65 1.75 V

VUVLO_HYST Under-Voltage Lockout

Hysteresis 50 mV

Dynamic

tdON Delay On Time RL=500Ω, CL=0.1µF 20 µs

tR VOUT Rise Time RL=500Ω, CL=0.1µF 20 µs

tON Turn-On Time RL=500Ω, CL=0.1µF 40 µs

tdOFF Delay Off Time RL=500Ω, CL=0.1µF 15 µs

tF V

OUT Fall Time RL=500Ω, CL=0.1µF 110 µs

tOFF Turn-Off Time RL=500Ω, CL=0.1µF 125 µs

tBLANK Over-Current Blanking Time FPF2193, FPF2194 15 30 60 ms

tRSTRT Auto-Restart FPF2193 225 450 900

FPF2194, FPF2195 NA

tSC Short-Circuit Response Time

VIN=VOUT=3.3V, Moderate Over-

Current Condition 5 µs

VIN=VOUT=3.3V, Hard Short 30 ns

FPF2193/4/5 • Rev. 1.0.4 6

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Typical Performance Characteristics

Figure 5. Quiescent Current vs. Input Voltage Figure 6. Quiescent Current vs. Input Voltage

Figure 7. Quiescent Current vs. Temperature Figure 8. VON High Voltage vs. Input Voltage

Figure 9. VON Low Voltage vs. Input Voltage Figure 10. Current Limit vs. Output Voltage

FPF2193/4/5 • Rev. 1.0.4 7

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Typical Performance Characteristics (Continued)

Figure 11. Current Limit vs. Temperature Figure 12. RON vs. VIN

Figure 13. RON vs. Temperature Figure 14. tON / tOFF vs. Temperature

Figure 15. tRISE / tFALL vs. Temperature Figure 16. tRSTRT vs. Temperature

FPF2193/4/5 • Rev. 1.0.4 8

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Typical Performance Characteristics (Continued)

Figure 17. tBLANK vs.Temperature Figure 18. tON Response

Figure 19. tOFF Response Figure 20. Short-Circuit Response Time

(Output Shorted to GND)

Figure 21. Current Limit Response Time

(Switch is Powered into a Short) Figure 22. Current Limit Response Time

(Output is Loaded by 2.2Ω, COUT=0.1µF)

FPF2193/4/5 • Rev. 1.0.4 9

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Typical Performance Characteristics (Continued)

Figure 23. Current Limit Response Time

(Output is Loaded by 2.2Ω, COUT=10µF) Figure 24. Short-Circuit Detection Function

(

)

Figure 25. tBLANK vs. Response

(

)

Figure 26. tRESTART vs. Response

(

)

Notes:

2. When the output voltage is below VSCTH=1.1V, the current limit value is set at 62.5% of the current limit value.

3. VDRV signal forces the device to go into over-current condition by loading.

FPF2193/4/5 • Rev. 1.0.4 10

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Functional Description

The FPF2193, FPF2194, and FPF2195 are current-

limited switches that protect systems and loads that can

be damaged or disrupted by the application of high

currents. The core of each device is a 55mΩ P-channel

MOSFET and a controller capable of functioning over the

wide input operating range of 1.8- 5.5V. The controller

protects against system malfunctions through current

limiting, under-voltage lockout, and thermal shutdown.

The current limit is adjustable from 100mA to 1.5A

through the selection of an external resistor.

On/Off Con tro l

The ON pin controls the state of the switch. When ON is

HIGH, the switch is in ON state. Activating ON

continuously holds the switch in the ON state so long as

there is no fault. For all versions, an under-voltage on VIN

or a junction temperature in excess of 140°C overrides

the ON control to turn off the switch. In addition,

excessive currents cause the switch to turn off in the

FPF2193 and FPF2194. The FPF2193 has an auto-

restart feature that automatically turns the switch on again

after 450ms. For the FPF2194, the ON pin must be

toggled to turn the switch on again. The FPF2195 does

not turn off in response to an over-current condition, but

remains operating in constant-current mode aslong as

ON is active and the thermal shutdown or under-voltage

lockout have not activated.

Fault Reporting

Upon the detection of an over-current, input under-

voltage, or over-temperature condition, FLAGB signals

the fault mode by activating LOW. For the FPF2193 and

FPF2194, the FLAGB goes LOW at the end of the

blanking time, while FLAGB goes LOW immediately for

the FPF2195. FLAGB remains LOW through the auto-

restart time for the FPF2195. For the FPF2194, FLAGB is

latched LOW and ON must be toggled to release it. With

the FPF2195, FLAGB is LOW during the faults and

immediately returns HIGH at the end of the fault

condition. FLAGB is an open-drain MOSFET that requires

a pull-up resistor between VIN and FLAGB. During

shutdown, the pull-down on FLAGB is disabled to reduce

current draw from the supply.

Current Limiting

The current limit ensures that the current through the

switch doesn't exceed a maximum value, while not

limiting at less than a minimum value. The current at

which the parts limit is adjustable through the selection of

an external resistor connected to ISET. Information for

selecting the resistor is found in the Application

Information section. The FPF2193 and FPF2194 have a

blanking time of 30ms, nominally, during which the switch

acts as a constant current source. At the end of the

blanking time, the switch is turned off. The FPF2195 has

no current limit blanking period, so it remains in a

constant current state until the ON pin is deactivated or

the thermal shutdown turns off the switch.

For preventing the switch from large power dissipation

during heavy load, a short-circuit detection feature is

introduced. Short-circuit condition is detected by,

observing the output voltage. The switch is put into short-

circuit current-limiting mode if the switch is loaded with a

heavy load. When the output voltage drops below VSCTH,

the short-circuit detection threshold voltage, the current

limit value is re-conditioned and the short-circuit current-

limit value is decreased to 62.5% of the current limit

value. This keeps the power dissipation of the part below

a certain limit even at dead-short conditions at 5.5V input

voltage. The VSCTH value is set to be 1V. At around 1.1V

of output voltage, the switch is removed from short-circuit

current-limiting mode and the current limit is set to the

current limit value.

Under-Voltage Lockout (UVLO)

The under-voltage lockout turns the switch off if the input

voltage drops below the under-voltage lockout threshold.

With the ON pin active, the input voltage rising above the

under-voltage lockout threshold causes a controlled turn-

on of the switch, which limits current over shoot.

Thermal Shutdown

The thermal shutdown protects the die from internally or

externally generated excessive temperatures. During an

over-temperature condition, FLAGB is activated and the

switch is turned off. The switch automatically turns on

again if temperature of the die drops below the threshold

temperature.

Reverse-Current Blocking

The entire FPF2193/94/95 family has a reverse current

blocking feature that protects the input source against

current flow from output to input. For a standard USB

power design, this is an important feature to protect the

USB host from being damaged due to reverse current

flow on VBUS.

When the load switch is OFF, no current flows from the

output to the input. If the switch is turned on and the

output voltage is greater than input voltage, this feature is

activated and turns off the switch. This prevents any

current flow from output to input. The reverse-current

blocking feature is deactivated if the VOUT - VIN is smaller

than a typically 50mV threshold. During this time, some

current (50mV/RON) flows from the output to input until

input voltage becomes greater than output voltage.

FLAGB operation is independent of the reverse-current

blocking and does not report a fault condition if this

feature is activated.

Figure 27. Timing Diagram

where:

tdON = Delay On Time

tR = VOUT Rise Time

tON = Turn-On Time

tdOFF = Delay Off Time

tF = VOUT Fall Time

tOFF = Turn-Off Time

FPF2193/4/5 • Rev. 1.0.4 11

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Application Information

Figure 28. Typical Application

Setting Current Limit

The FPF2193, FPF2194, and FPF2195 current limit is

set with an external resistor connected between ISET

and GND. This resistor is selected using the following

equation:

LIM

SET I

6.551

R= (1)

RSET is in Ω and ISET is in Amps.

Table 1 can also be used to select RSET. A typical

application would be the 500mA current required by a

single USB port. Using Table 1, an appropriate

selection for the RSET resistor would be 788Ω. This

ensures that the port load could draw 525mA, but not

more than 875mA. Likewise for a dual-port system; an

RSET of 368Ω always delivers at least 1125mA and

never more than 1875mA.

Table 1. Current Limit Various RSET Values

RSET(Ω) Min. Current

Limit(mA) Typ. Current

Limit(mA) Max. Current

Limit(mA)

368 1125 1500 1875

441 928 1250 1562

552 750 1000 1250

613 675 900 1125

690 600 800 1000

788 525 700 875

919 450 600 750

1103 375 500 625

1226 338 450 563

1379 300 400 500

1576 263 350 438

1839 225 300 375

2206 188 250 313

2758 150 200 250

3677 113 150 188

5516 75 100 125

Input Capacitor

To limit the voltage drop on the input supply caused by

transient inrush currents when the switch is turned on

into a discharged load capacitor or a short-circuit, a

capacitor needs to be placed between VIN and GND. A

0.1µF ceramic capacitor, CIN, placed close to the pins is

usually sufficient. Higher values of CIN can be used to

further reduce the voltage drop.

Output Capaci t or

A 0.1µF capacitor, COUT, should be placed between

VOUT and GND. This capacitor prevents parasitic board

inductances from forcing VOUT below GND when the

switch turns off. For the FPF2193 and FPF2194, the

total output capacitance needs to be kept below a

maximum value, COUT(max), to prevent the part from

registering an over-current condition and turning off the

switch. The maximum output capacitance can be

determined from the following formula:

BLANKLIM

OUT V

(min)t(max)I

(max)C ×

= (2)

Power Dissipati on

During normal operation as a switch, the power

dissipated depends upon the level at which the current

limit is set. The maximum allowed setting for the current

limit is 1.5A and results in a power dissipation of:

mW75.123055.0)5.1(R)I(P 2

LIM =×=×= (3)

If the part goes into current limit, the maximum power

dissipation occurs when the output is shorted to ground.

For the FPF2193, the power dissipation scales by the

auto-restart time, tRSTRT, and the over-current blanking

time, tBLANK, so that the maximum power dissipated is:

mW6.5155.15.5

45030

(max)I(max)V

(max)P LIMIN

RSTRTBLANK

BLANK

=××

××

(4)

FPF2193/4/5 • Rev. 1.0.4 12

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

This is more power than the package can dissipate, but

the thermal shutdown of the part activates to protect the

part from damage due to excessive heating. When

using the FPF2194, attention must be given to the

manual resetting of the part. The junction temperature

is only able to increase to the thermal shutdown

threshold. Once this temperature has been reached,

toggling ON does not turn the switch on until the

junction temperature drops. For the FPF2195, a short

on the output causes the part to operate in a constant-

current state, dissipating a worst-case power of:

W25.85.15.5

(max)I(max)V(max)P LIMIN

=×=

×=

(5)

This large amount of power activates the thermal

shutdown and the part cycles in and out of thermal

shutdown as long as the ON pin is active and the short

is present.

Board Layout

For best performance, all traces should be as short as

possible. To be most effective, the input and output

capacitors should be placed close to the device to

minimize the effects that parasitic trace inductances

may have on normal and short-circuit operation. Using

wide traces for VIN, VOUT, and GND help to minimize

parasitic electrical effects along with minimizing the

case-to-ambient thermal impedance.

FPF2193/4/5 • Rev. 1.0.4 13

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit

Physical Dimensions

BOTTOM VIEW

SIDE VIEWS

RECOMMENDED LAND PATTERN

BALL A1

INDEX AREA

SEATING PLANE

(NSMD PAD TYPE)

(Ø0.350)

SOLDER MASK

OPENING

(X) ±0.018

(Y) ±0.018

(Ø0.250)

Cu Pad

0.06 C

0.05 CE

NOTES:

A. NO JEDEC REGISTRATION APPLIES.

B. DIMENSIONS ARE IN MILLIMETERS.

C. DIMENSIONS AND TOLERANCE

PER ASMEY14.5M, 1994.

D. DATUM C IS DEFINED BY THE SPHERICAL

CROWNS OF THE BALLS.

E. PACKAGE NOMINAL HEIGHT IS 582 MICRONS

±43 MICRONS (539-625 MICRONS).

F. FOR DIMENSIONS D, E, X, AND Y SEE

PRODUCT DATASHEET.

G. DRAWING FILNAME: MKT-UC006AFrev2.

0.03 C

Ø0.315 +/- .025

0.332±0.018

0.250±0.025

(1.00)

(0.50)

0.005 CAB

0.50

1.00

0.625

0.539

TOP VIEW

Figure 29. 6-Ball, Wafer-Level Chip-Scale Package (WLCSP)

Product D E X Y

FPF2193 1.500+/-0.030 1.000+/-0.030 0.240 0.240

FPF2194 1.500+/-0.030 1.000+/-0.030 0.240 0.240

FPF2195 1.500+/-0.030 1.000+/-0.030 0.240 0.240

Pack age drawings are provi ded as a servic e to customers considering Fairc h i l d components. Drawi ngs may change in any manner

without notice. P l ease note the revi sion and/or date on t he drawing and contac t a Fairchild S emic onductor representative to v er ify

or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically

the warranty therein, which covers Fairchild products.

Always visit Fairchild Semiconductor’ s online packaging area for the most recent package drawings:

http://www.fairchildsemi.com/packaging/.

FPF2193/4/5 • Rev. 1.0.4 14

FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit