Fairchild FPF2500, FPF2506 service manual
February 2006
FPF2500-FPF2506
IntelliMAX™ Advanced Load Management Products
FPF2500-FPF2506 IntelliMAX™ Advanced Load Management Products
Features
4.5 to 20V Input Voltage Range
Controlled Turn-On
0.4A, 0.8A and Adjustable Current Limit Option
Undervoltage Lockout
Thermal Shutdown
<10uA Shutdown Current
Auto Restart
Fault Blanking
Applications
PDAs
Motor Drivers
Cell Phones
Digital Cameras
General Description
The FPF2500 through FPF2506 is a family of load switches
which provide full protection to systems and loads which may
encounter large current conditions. These devices contain a
0.23Ω current-limited N-channel MOSFET which can operate
over an input voltage range of 4.5-20V. 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 FPF2500, FPF2501,
FPF2503 and FPF2505, if the constant current condition still
persists after 5ms, these parts will shut off the switch and, for
the FPF2503 and FPF2505, the fault signal pin (FLAGB) will be
pulled low. The FPF2500, FPF2503, and FPF2505, have an
auto-restart feature which will turn the switch on again after
640ms if the ON pin is still active. The FPF2501 does not have
this auto-restart feature so the switch will remain off until the ON
pin is cycled. For the FPF2502, FPF2504 and FPF2506, 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. For the FPF2500
through FPF2502, the minimum current limit is adjustable from
500mA to 2A. For the FPF2503 and FPF2504 the minimum
current is internally fixed at 400mA while that for the FPF2505
and FPF2506 is internally fixed at 800mA.
These parts are available in a space-saving 5 pin SOT23
package.
Typical Application Circuit
TO LOAD
TO LOAD
GND
GND
V
OUT
ISET
V
OUT
FLAGB
5.5V max
V
IN
FPF2500-FPF2502
OFF ON ON
5.5V max
V
IN
FPF2503- FPF2506
-
©2006 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com
FPF2500-FPF2506 Rev. C4
OFF ON
5.5V max
ON
Functional Block Diagram
V
IN
UVLO
FPF2500-FPF2506 IntelliMAX™ Advanced Load Management Products
ON
V
ON
IN
THERMAL
SHUTDOWN
UVLO
THERMAL
SHUTDOWN
CONTROL
LOGIC
CURRENT
LIMIT
FPF2500, FPF2501, FPF2502
CONTROL
LOGIC
CURRENT
LIMIT
V
OUT
I
SET
GND
V
OUT
FLAGB
Pin Configuration
FPF2500-FPF2506 Rev. C4
FPF2503, FPF2504
FPF2505, FPF2506
V
1
OUT
2
GND
FLAGB/ISET
34
SOT23-5
GND
V
5
IN
ON
2 www.fairchildsemi.com
Pin Description
Pin Name Function
1 V
IN
2 GND Ground
3 ON ON Control Input:
4 FLAGB Fault Output (FPF2503-FPF2506): Active LO, open drain output which indicates on over
ISET Adjustable Current Limit Setting Resistor (FPF2500-FPF2502): An external resistor
5 V
OUT
Supply Input: Input to the power switch and the supply voltage for the IC
current supply under voltage or over temperature state.
connected between this pin and ground sets the current limit value.
Switch Output: Output of the power switch
Absolute Maximum Ratings
Parameter Min. Max. Unit
VIN, V
ON, FLAGB, ISET to GND -0.3 5.5 V
Power Dissipation @ T
Operating Temperature Range -40 125 °C
Storage Temperature -65 150 °C
Thermal Resistance, Junction to Ambient 150 °C/W
Electrostatic Discharge Protection HBM 2000 V
, to GND -0.3 20 V
OUT
=25°C (Note 1) 667 mW
A
MM 200 V
FPF2500-FPF2506 IntelliMAX™ Advanced Load Management Products
Recommended Operating Range
Parameter Min. Max. Unit
V
IN
Ambient Operating Temperature, T
A
4.5 20 V
-40 85 °C
Electrical Characteristics
VIN = 4.5 to 20V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 12V and TA = 25°C.
Parameter Symbol Conditions Min. Typ. Max Units
Basic Operation
Operating Voltage V
Quiescent Current I
Shutdown Current I
Latch-Off Current (Note 2) I
On-Resistance R
ON Input Logic High Voltage V
ON Input Logic Low Voltage V
IN
Q
SHDN
LATCHOFF
ON
IH
IL
ON Input Leakage V
Off Switch Leakage I
SWOFF
FLAGB Output Logic Low Voltage V
FLAGB Output High Leakage Current V
I
= 0mA, VIN = 12V, Von=5V 60 100 µA
OUT
FPF2501 45 µA
TA = 25°C, I
= -40 to +85°C, I
T
A
= 50mA 230 320 mΩ
OUT
= 50mA 300
OUT
VIN = 4.5V to 20V 0.9 V
VIN = 4.5V to 20V 0.4 V
= 5V or GND -1 1 µA
ON
VON = 0V, V
= 5V, I
IN
= 5V, Switch on 1 µA
IN
= 0V 0.01 µA
OUT
= 10mA 0.1 0.2 V
SINK
4.5 20 V
1 µA
FPF2500-FPF2506 Rev. C4
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Electrical Characteristics Cont.
VIN = 4.5 to 20V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 12V and TA = 25°C.
Parameter Symbol Conditions Min. Typ. Max Units
Protections
Current Limit I
LIM
TA=25 °C
Thermal Shutdown TJ Increasing 140 °C
Decreasing 130 °C
T
J
Under Voltage Shutdown UVLO V
Increasing 3.75 3.85 4.00 V
IN
Under Voltage Shutdown Hysteresis 100 mV
Dynamic
Turn on time t
Turn off time t
Rise Time t
V
OUT
Fall Time t
V
OUT
Over Current Blanking Time t
Auto-Restart Time t
ON
OFF
R
F
BLANK
RESTART
Short Circuit Response Time V
RL=500Ω, CL=1uF 1 ms
RL=500Ω, CL=1uF 0.1 ms
RL=500Ω, CL=1uF 3 ms
RL=500Ω, CL=1uF 1.5 ms
FPF2500, FPF2501, FPF2503, FPF2505
FPF2500, FPF2503, FPF2505 320 640 1280 ms
= 12V , VON = 5V
IN
Moderate Overcurrent Condition
FPF2503
FPF2504
FPF2505
FPF2506
FPF2500
FPF2501
FPF2502
400 600 800 mA
800 1200 1600
0.7xI
NOM
1.0xI
NOM
1.3xI
NOM
2.5 5 10 ms
3 µs
FPF2500-FPF2506 IntelliMAX™ Advanced Load Management Products
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.
Note 2: Applicable only to FPF2501. Latchoff current does not include current flowing into FLAGB.
FPF2500-FPF2506 Rev. C4
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