Datasheet

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FPF2140/42/43/44/46/47 Rev. D

FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking

October 2007

FPF2140/42/43/44/46/47

Full Function Load Switch with Reverse Current Blocking

Features

 1.8 to 5.5V Input Voltage Range

 Controlled Turn-On

 200mA and 400mA Current Limit Options

 Undervoltage 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

 Power Good Function

 RoHS Compliant

Applications

 PDAs

 Cell Phones

 GPS Devices

 MP3 Players

 Digital Cameras

 Peripheral Ports

 Hot Swap Supplies

General Description

The FPF2140/42/43/44/46/47 is a series of load switches which

provides full protection to systems and loads which may

encounter large current conditions. These devices contain a

0.12Ω current-limited P-channel MOSFET which can operate

over an input voltage range of 1.8-5.5V. 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

which 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 part

operates in a constant-current mode to prohibit excessive

currents from causing damage. For the FPF2140/42/44/46, if

the constant current condition still persists after 30ms, the part

will shut off the switch and pull the fault signal pin (FLAGB) low.

The FPF2140/44 have an auto-restart feature which will turn the

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

FPF2142/46 do not have this auto-restart feature so the switch

will remain off until the ON pin is cycled. For the FPF2143/47, a

current limit condition will immediately pull the fault signal pin

low and the part will remain in the constant-current mode until

the switch current falls below the current limit. The minimum

current limit is 200mA for the FPF2140/42/43 while that for the

FPF2144/46/47 is 400mA.

These parts are available in a space-saving 6 pin 2X2 MLP

package.

Ordering Information

Part

Current Limit

[mA]

Current Limit

Blanking Time

[ms]

Auto-Restart

Time

[ms]

ON Pin

Activity

FPF2140 200/300/400 15/30/60 225/450/900 Active HI

FPF2142 200/300/400 15/30/60 NA Active HI

FPF2143 200/300/400 0 NA Active HI

FPF2144 400/600/800 15/30/60 225/450/900 Active HI

FPF2146 400/600/800 15/30/60 NA Active HI

FPF2147 400/600/800 0 NA Active HI

BOTTOM

TOP

Pin 1

Summary of content (13 pages)

PAGE 1
FPF2140/42/43/44/46/47 tm Full Function Load Switch with Reverse Current Blocking Features General Description 1.8 to 5.5V Input Voltage Range The FPF2140/42/43/44/46/47 is a series of load switches which provides full protection to systems and loads which may encounter large current conditions. These devices contain a 0.12Ω current-limited P-channel MOSFET which can operate over an input voltage range of 1.8-5.5V.
PAGE 2
TO LOAD VIN VOUT FPF2140/2/3/4/6/7 FLAGB PGOOD OFF ON ON GND Functional Block Diagram VIN UVLO REVERSE CURRENT BLOCKING CONTROL LOGIC ON THERMAL SHUTDOWN CURRENT LIMIT VOUT FLAGB PGOOD GND FPF2140/42/43/44/46/47 Rev. D 2 www.fairchildsemi.
PAGE 3
ON 6 GND 5 FLAGB 4 7 1 PGOOD 2 VIN 3 VOUT 2X2 MicroFET-6 Pin Description Pin Name 1 PGOOD 2 VIN 3 VOUT 4 FLAGB 5, 7 GND 6 ON Function Power Good output: Open drain output which indicate that output voltage has reached 90% of input voltage Supply Input: Input to the power switch and the supply voltage For the IC Switch Output: Output of the power switch Fault Output: Active LO, open drain output which indicates an over current supply under voltage or over temperature state.
PAGE 4
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. Parameter Symbol ON Input Logic High Voltage (ON) VIH ON Input Logic Low Voltage VIL Conditions Min VIN = 1.8V 0.8 VIN = 5.5V 1.4 Typ Max Units V VIN = 1.8V 0.5 VIN = 5.5V 1 V ON Input Leakage VON = VIN or GND -1 1 µA VIN Shutdown Current VON = 0V, VIN = 5.5V, VOUT = short to GND -2 2 µA FLAGB Output Logic Low Voltage VIN = 5V, ISINK = 10mA 0.05 0.2 VIN = 1.
PAGE 5
110 90 105 100 SUPPLY CURRENT (uA) SUPPLY CURRENT (uA) 85 80 75 70 65 95 90 VIN = 5.5V 85 80 VIN = 3.3V 75 70 VIN = 1.8V 65 60 55 60 50 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 -40 -15 SUPPLY VOLTAGE (V) Figure 1. Quiescent Current vs. Input Voltage 1.3 1.2 1.2 1.1 1.1 1 0.9 0.8 60 85 1 0.9 0.8 0.7 0.6 0.7 0.5 0.6 1.5 2 2.5 3 3.5 4 4.5 5 5.5 1.5 6 2 2.5 3 3.5 4 4.5 5 5.5 6 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Figure 4. VON Low Voltage vs.
PAGE 6
700 350 FPF2140 / 42 / 43 VIN = 5.5V FPF2144 / 46 / 47 VIN = 5.5V 600 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 300 250 200 150 100 500 400 300 200 100 50 0 0 0 1 2 3 VIN - VOUT (V) 4 5 0 6 1 2 3 4 Figure 7. Current Limit vs. Output Voltage 6 Figure 8.
PAGE 7
33 500 495 32.5 RESTART TIME (mS) BLANK TIME (mS) 490 32 31.5 31 30.5 485 480 475 470 465 460 30 455 450 29.5 -40 -15 10 35 TJ, JUNCTION TEMPERATURE (°C) 60 -40 85 -15 Figure 13. TBLANK vs. Temperature 35 60 85 Figure 14. TRESTART vs. Temperature CIN = 10µF COUT = 0.1µF RL = 500Ω VIN = 3.3V VON 2V/DIV 10 TJ, JUNCTION TEMPERATURE (°C) CIN = 10µF COUT = 0.1µF RL = 500Ω VIN = 3.3V VON 2V/DIV IOUT 10mA/DIV IOUT 10mA/DIV VOUT 2V/DIV 100µs/DIV 500ns/DIV Figure 15.
PAGE 8
VIN 2V/DIV VIN 2V/DIV VON 2V/DIV VON 2V/DIV CIN = 10µF COUT = 0.1µF VIN = 3.3V IOUT 500mA/DIV IOUT 500mA/DIV VOUT 2V/DIV VOUT 2V/DIV 50µs/DIV 50µs/DIV Figure 20. Current Limit Response Time (Output is loaded by 2.2Ω, COUT = 10µF) Figure 19. Current Limit Response Time (Output is loaded by 2.2Ω, COUT = 0.1µF) VIN 5V/DIV FPF2140/42/44/46 VDRV2 2V/DIV CIN = 10µF COUT = 0.1µF RL = 500Ω VIN = 5.5V VON 5V/DIV CIN = 10µF COUT = 10µF VIN = 3.
PAGE 9
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, short circuit detection threshold voltage, the current limit value re-conditioned and short circuit current limit value is decreased to 62.5% of the current limit value.
PAGE 10
Typical Application FPF2140/2/3/4/6/7 Typical value = 100KΩ Battery 1.8V-5.5V OFF ON LOAD VOUT VIN PGOOD ON R1 = 100KΩ FLAGB GND R2 = 499Ω C2 = 0.1µF C1 = 0.1µF Input Capacitor To limit the voltage drop on the input supply caused by transient in-rush currents when the switch turns-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.
PAGE 11
Startup Power Sequence VIN1 PGOOD VIN1 FPF2140/2/ VOUT1 3/4/6/7 To Load FLAGB OFF ON ON GND 100KΩ VIN2 PGOOD VIN2 FPF2140/2/ VOUT2 3/4/6/7 To Load FLAGB ON GND 100KΩ TP Power good function in sequential startup. No battery is loaded to the output Power Good Sequential Startup using Power Good FPF214X family has a "Power Good" feature. PGOOD pin is an open-drain MOSFET which asserts high when the output voltage reaches 90% of the input voltage.
PAGE 12
FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking Dimensional Outline and Pad Layout FPF2140/42/43/44/46/47 Rev. D 12 www.fairchildsemi.
PAGE 13
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