Datasheet

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December 2013

FPF2700 / FPF2701 / FPF2702 • Rev. 1.0.3

FPF2700 / FPF2701 / FPF2702 — AccuPower™ 0.4~2A Adjustable Over-Current Protection Load Switches

FPF2700 / FPF2701 / FPF2702 — AccuPower™ 0.4~2 A

Adjustable Over-Current Protection Load Switches

Features

 2.8 V to 36 V Input Voltage Range

 Typical R

DS(ON)

=88 m

 0.4 A to 2 A Adjustable Current Limit (Min.)

 Slew Rate Controlled

 ESD Protected, above 2000 V HBM

 Thermal Shutdown

 Active LOW Enable

 UVLO Protection

 Power-Good Output

Applications

 Motor Drives

 Digital Cameras

 Consumer Electronics

 Industrial

 Computing

 Hard Disk Drives

 Telecom Equipment

Figure 1. MLP (Top View)

Figure 2. MLP (Bottom View)

Figure 3. SO8 (Top View)

Description

The AccuPower™ FPF270X series is a family of

current-limit load switches that provide full protection to

systems and loads from excess current conditions.

Minimum current limit is adjustable from 0.4 A to 2.0 A.

The FPF270X contains a slew-rate-controlled N-channel

MOSFET and slew-rated turn-on to prevent power bus

disturbances from being caused by “hot plugging” loads

or momentary excess load demands. The input voltage

range is 2.8 V to 36 V. Loads can be activated or

deactivated with a low-voltage logic-compatible ON pin.

Fault conditions can be monitored using the error flag

pin and/or the power-good pin.

Each member of the FPF270X family serves a category

of load-fault response. All devices clamp the load

current so that it cannot exceed an externally

programmed current level. An over temperature feature

provides further device protection in case of excessive

levels of power dissipation.

FPF2700 responds to an overload condition that lasts

longer than a fixed blanking period by turning off the

load, followed by a retry after the auto-restart time.

FPF2701 responds to an overload condition that lasts

longer than a fixed blanking period by latching off the

load. The load remains off unless either the ON pin is

toggled or the input voltage cycles through UVLO.

FPF2702 is intended to be used with external fault

management. Like the FPF2700 and FPF2701, it sets

the fault signal pin LOW when it activates current

clamping. This device is intended for applications where

external fault management coordinates the overload

response with the FPF2702.

The FPF270X is available in a space-saving, Lead and

Halogen free, 8-lead, MLP 3x3 mm and SO8 packages.

Ordering Information

Part

Number

Current Limit [A]

Current Limit

Blanking Time [ms]

Auto-Restart

Time [ms]

ON Pin

Activity

Package

FPF2700MPX

0.4 – 2.0

0.5

127.5

Active LOW

MLP3X3

FPF2701MPX

0.4 – 2.0

0.5

Active LOW

MLP3X3

FPF2702MPX

0.4 – 2.0

Active LOW

MLP3X3

FPF2700MX

0.4 – 2.0

0.5

127.5

Active LOW

SO8

FPF2701MX

0.4 – 2.0

0.5

Active LOW

SO8

FPF2702MX

0.4 – 2.0

Active LOW

SO8

Summary of content (19 pages)

PAGE 1
FPF2700 / FPF2701 / FPF2702 — AccuPower™ 0.4~2 A Adjustable Over-Current Protection Load Switches Features Description          The AccuPower™ FPF270X series is a family of current-limit load switches that provide full protection to systems and loads from excess current conditions. Minimum current limit is adjustable from 0.4 A to 2.0 A.
PAGE 2
36 V MAX. VIN VOUT ON FLAGB TO LOAD OFF ON VIN 2.8 V – 36 V 100KΩ 100KΩ COUT CIN ISET PGOOD RSET GND Figure 4. Typical Application Block Diagram IN VDD VREF BGAP/BIAS Reg Current Limit SOA Protection Current Limit UVLO CONTROL LOGIC VREF ON THERMAL PROTECTION CHARGE PUMP ISET VIN OUT VOUT PGOOD FLAGB + - FPF2700 / FPF2701 / FPF2702 — AccuPower™ 0.4~2A Adjustable Over-Current Protection Load Switches Application Diagram GND Figure 5.
PAGE 3
VOUT 8 1 VIN FLAGB 7 2 PGOOD VIN 1 8 VOUT PGOOD 2 7 FLAGB ISET 3 6 NC ON 4 5 GND GND NC 6 3 ISET GND 5 4 ON Figure 6. MLP (Bottom View) Figure 7. SO8 (Top View) Pin Definitions Pin # Name Description 1 VIN 2 PGOOD Power-Good Output. Open-drain output to indicate that output voltage has reached 90% of input voltage. 3 ISET Current Limit Set Input. A resistor from ISET to ground sets the current limit for the switch. 4 ON 5 GND 6 NC 7 FLAGB Fault Output.
PAGE 4
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 PGOOD, FLAGB, VIN to GND -0.3 40 V VOUT to GND -0.3 VIN + 0.3 V ON to GND -0.
PAGE 5
VIN=2.8 to 36 V and TA=-40 to +85°C unless otherwise noted. Typical values are at VIN=12 V and TA=25°C. Symbol Parameter Conditions Min. Typ. Max. Unit Basic Operation VIN Operating Voltage IQ Quiescent Current VIN=12 V, VON=0 V, IOUT=0 A ISHDN Shutdown Current VIN=36 V, VON=3.3 V, IOUT=0 A TA=25°C, VIN=12 V RON On Resistance 2.8 36.
PAGE 6
VOUT 90 % 90 % 10 % tR 10 % tF 3.3 V VON 50 % 50 % 90 % 10 % VOUT tdon tdoff tON = tR + tdon tOFF = tF + tdoff Figure 12. Timing Diagram Typical Performance Characteristics VIN = 12 V and TA = 25°C. 1.40 1.80 TA = 25°C V IN = 12V 1.70 1.38 On Threshold Voltage (V) On Threshold Voltage (V) 1.60 1.35 V IH 1.33 1.30 V IL 1.28 1.50 1.40 V IH 1.30 V IL 1.20 1.10 1.25 1.00 1.23 0.90 1.20 0.80 0 5 10 15 20 25 30 35 40 -50 -25 0 25 Figure 13. ON Threshold vs.
PAGE 7
VIN = 12 V and TA = 25°C. 100 160 95 On Resistance (m) On Resistance (m) 140 90 120 85 100 80 75 80 70 60 65 40 60 0 10 20 30 Supply Voltage (V) -50 -25 0 25 50 75 100 o125 150 TJ, Junction Temperature ( C) 40 Figure 17. On Resistance vs. Supply Voltage Figure 18. On Resistance vs. Junction Temperature 4.0 12 VIN = 12V RL = 500 CL = 2µF 11 10 Rise Time (ms) Turn-On Delay (ms) 3.5 3.0 9 2.5 8 7 2.0 6 1.5 5 4 1.
PAGE 8
When VOUT<2 V, the current limit is set to 75% of ILIM. 5V VON 0V VIN VOUT 2V 0V Slew rate limited turn-on tRISE = 7.5ms IOUT ILIM Turn-on delay tDON = 2.7ms Figure 23. Normal Startup to 0.5X ILIM VIN VIN VOUT 2V 0V 12A 2V 0V 12A Current limited operation at 0.75xILIM IOUT ILIM 0.
PAGE 9
VIN VOUT 2V 0V 12A Current limited operation at 0.75xILIM IOUT Switch turned off due to over-heating ILIM 0.75x ILIM OUT shorted to GND and switch immediately turned OFF Switch turns back ON and enters current limited operation at short circuit current limit (75 % of ISET ) Turn - on delay is similar to normal tDON ~ 2.7ms FLAGB FLAGB asserts due to current limit FLAGB asserts due to Thermal Shutdown Figure 28.
PAGE 10
VIN = 12 V and TA = 25°C. Figure 30. 12V Turn-On Delay (RL=500 , COUT=2 µF) Figure 31. 12 V Turn-Off Delay (RL=500 , COUT=2 µF) Figure 32. 12 V Blanking Time (Output Overloaded and tblank Expired, FPF2700/01, (2) ILIM=1 A, ILOAD=3.3 A, COUT= µF, RLOAD=500 ) VOC Figure 33. 12 V Restart Time (Switch Turned ON into Persistent Over-Current Condition,tRESTART~127.5 ms) FPF2700 / FPF2701 / FPF2702 — AccuPower™ 0.
PAGE 11
Description of Operation Current Limiting The FPF270X family of current limit load switches is designed to meet the power requirements of a variety of applications with wide input voltage range of 2.8 V to 36 V and adjustable current-limit value. The FPF270X family offers control and protection while providing optimum operation current for safe design practices.
PAGE 12
RSET Selection Guide Power Good Current Limit [A] RSET (k) Min. Typ. Max. 111 2.00 2.50 3.00 20 124 1.79 2.24 2.69 20 147 1.51 1.89 2.27 20 182 1.22 1.52 1.83 20 220 1.01 1.26 1.51 20 274 0.81 1.01 1.22 20 374 0.59 0.74 0.89 20 549 0.40 0.51 0.61 20 FPF270X has a power good feature. The PGOOD pin is an open-drain MOSFET that asserts HIGH when the output voltage reaches 90% of the input voltage (Figure 26).
PAGE 13
During extended output-short conditions, excessive power dissipation occurs in the load switch. FPF2700 and PFP2701 are protected by turning off the load switch after blanking time. FPF2702 has no blanking time feature; please refer to Note 3. It is possible to estimate the SOA for the two FPF2702 packages, MPX and MX, through their respective SOA curves shown in Figure 39 and Figure 40.
PAGE 14
Power Dissipation 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 short-circuit; an input capacitor, CIN, is recommended between the IN and GND pins. The FPF270X features a fast current limit response time (50 μs). During this period, the device relies on the input capacitor to supply the load current. A 10 μF to 100 μF ceramic capacitor is adequate for CIN in most cases.
PAGE 15
For the 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 (Figure 42). Using wide traces for IN, OUT, and GND pins helps minimize parasitic electrical effects as well as the caseto-ambient thermal impedance. 3.
PAGE 16
The FPF270X demonstration board has components and circuitry to demonstrate the load switch’s functions and features. Thermal performance of the board is improved using the techniques recommended in the layout recommendations section. Additional information about demonstration board can be found in the FPF270X board users guide. Figure 44. Top, SST, and AST Layers Figure 45. Bottom and ASB Layers © 2010 Fairchild Semiconductor Corporation FPF2700 / FPF2701 / FPF2702 • Rev. 1.0.
PAGE 17
0.65 A 4.90±0.10 (0.635) 8 5 B 1.75 6.00±0.20 1 PIN ONE INDICATOR 5.60 3.90±0.10 4 1.27 1.27 0.25 C B A LAND PATTERN RECOMMENDATION SEE DETAIL A 0.175±0.75 0.22±0.30 C 1.75 MAX 0.10 0.42±0.09 OPTION A - BEVEL EDGE (0.86) x 45° R0.10 GAGE PLANE R0.10 OPTION B - NO BEVEL EDGE 0.36 NOTES: UNLESS OTHERWISE SPECIFIED 8° 0° A) THIS PACKAGE CONFORMS TO JEDEC MS-012, VARIATION AA. B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS.
PAGE 18
3.00 0.15 C A 2X 2.52 B 8 3.00 5 1.94 1.70 3.30 PIN1 IDENT 0.56 8X 0.15 C TOP VIEW 1 2X 0.65 4 0.47 8X RECOMMENDED LAND PATTERN 0.80 MAX 0.10 C (0.20) 0.08 C 0.05 0.00 NOTES: C SIDE VIEW A. PACKAGE CONFORMS TO JEDEC MO-229 EXCEPT WHERE NOTED. SEATING PLANE B. DIMENSIONS ARE IN MILLIMETERS. C. DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 2.45 2.35 PIN 1 IDENT 1 (0.35) 4X D. LAND PATTERN RECOMMENDATION IS BASED ON FSC DESIGN ONLY. E. DRAWING FILENAME: MKT-MLP08Vrev1. 4 1.
PAGE 19
FPF2700 / FPF2701 / FPF2702 — AccuPower™ 0.4~2A Adjustable Over-Current Protection Load Switches © 2010 Fairchild Semiconductor Corporation FPF2700 / FPF2701 / FPF2702 • Rev. 1.0.3 www.fairchildsemi.