Fairchild FPF2123, FPF2125 service manual
tm
September 2006
FPF2123-FPF2125
IntelliMAX™ Advanced Load Management Products
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
Features
1.8 to 5.5V Input Voltage Range
Controlled Turn-On
0.15-1.5A Adjustable Current Limit
Undervoltage Lockout
Thermal Shutdown
<2uA Shutdown Current
Auto Restart
Fast Current limit Response Time
3us to Moderate Over Currents
20ns to Hard Shorts
Fault Blanking
Reverse Current Blocking
Applications
PDAs
Cell Phones
GPS Devices
MP3 Players
Digital Cameras
Peripheral Ports
Hot Swap Supplies
General Description
The FPF2123, FPF2124, and FPF2125 are a series of load
switches which provide full protection to systems and loads
which may encounter large current conditions. These devices
contain a 0.125Ω current-limited P-channel MOSFET which can
operate over an input voltage range of 1.8-5.5V. The current
limit is settable using an external resistor. 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 parts
operate in a constant-current mode to prohibit excessive
currents from causing damage. For the FPF2123 and FPF2124
if the constant current condition still persists after 10ms, these
parts will shut off the switch. The FPF2123 has an auto-restart
feature which will turn the switch on again after 160ms if the ON
pin is still active. The FPF2124 does not have this auto-restart
feature so the switch will remain off after a current limit fault until
the ON pin is cycled. The FPF2125 will not turn off after a
current limit fault, but will rather remain in the constant current
mode indefinitely. The minimum current limit is 150mA.
These parts are available in a space-saving 5 pin SOT23
package
Typical Application Circuit
V
FPF2123 - FPF2125
OFF ON ON
IN
GND
V
OUT
ISET
Ordering Information
Current Limit
Current Limit
Part
FPF2123 0.15 - 1.5 5/10/20 80/160/320 Active HI 2123
FPF2124 0.15 - 1.5 5/10/20 NA Active HI 2124
FPF2125 0.15 - 1.5 Infinite NA Active HI 2125
[A]
Blanking Time
[ms]
Auto-Restart
Time
[ms]
ON Pin
Activity Top Mark
TO LOAD
©2006 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com
FPF2123-FPF2125 Rev. C4
Functional Block Diagram
V
IN
UVLO
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
ON
THERMAL
SHUTDOWN
Pin Configuration
CONTROL
LOGIC
V
IN
REVERSE
CURRENT
BLOCKING
CURRENT
LIMIT
V
OUT
ISET
GND
V
1
5
OUT
Pin Description
Pin Name Function
1V
2 GND Ground
3 ON ON Control Input
4 ISET Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch.
5V
FPF2123-FPF2125 Rev. C4
IN
OUT
2
GND
34
ON
SOT23-5
Supply Input: Input to the power switch and the supply voltage for the IC
Switch Output: Output of the power switch
2 www.fairchildsemi.com
ISET
Absolute Maximum Ratings
Parameter Min. Max. Unit
VIN, 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 4000 V
, ON, ISET to GND -0.3 6 V
OUT
= 25°C (note 1) 667 mW
A
MM 400 V
Recommended Operating Range
Parameter Min. Max. Unit
V
IN
Ambient Operating Temperature, T
A
1.8 5.5 V
-40 85 °C
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.
Parameter Symbol Conditions Min. Typ. Max Units
Basic Operation
Operating Voltage V
Quiescent Current I
Shutdown Current I
Reverse Block Leakage Current I
Latch-Off Current I
On-Resistance R
ON Input Logic High Voltage (ON) V
ON Input Logic Low Voltage V
ON Input Leakage V
Off Switch Leakage I
IN
Q
SHDN
BLOCK
LATCHOFF
ON
IH
IL
SWOFF
I
= 0mA VIN = 1.8 to 3.3V 75 µA
OUT
= 3.3 to 5.5V 80 120
V
IN
FPF2124 50 µA
TA = 25°C, I
= -40 to +85°C, I
T
A
= 50mA 125 160 mΩ
OUT
= 50mA 150
OUT
VIN = 1.8V 0.75 V
= 5.5V 1.30
V
IN
VIN = 1.8V 0.5 V
= 5.5V 1.0
V
IN
= VIN or GND 1 µA
ON
VON = 0V, V
= 0V 1 µA
OUT
Protections
Current Limit I
Min. Current Limit I
LIM
LIM(min.)
VIN = 3.3V, V
RSET=576Ω
VIN = 3.3V, V
= 3.0V,
OUT
= 3.0V 150 mA
OUT
Thermal Shutdown Shutdown Threshold 140 °C
Return from Shutdown 130
Hysteresis 10
Under Voltage Shutdown UVLO V
Increasing 1.5 1.6 1.7 V
IN
Under Voltage Shutdown Hysteresis 50 mV
1.8 5.5 V
2 µA
1 µA
600 800 1000 mA
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
FPF2123-FPF2125 Rev. C4
3 www.fairchildsemi.com
Electrical Characteristics Cont.
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 Conditions Min. Typ. Max Units
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
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.
RL=500Ω, CL=0.1uF 25 µs
RL=500Ω, CL=0.1uF 70 µs
RL=500Ω, CL=0.1uF 12 µs
RL=500Ω, CL=0.1uF 200 µs
FPF2123, FPF2124 5 10 20 ms
FPF2123 80 160 320 ms
FPF2124, FPF2125 NA
= VON = 3.3V. Moderate
IN
Over-Current Condition.
V
= VON = 3.3V. Hard Short. 20 µs
IN
3 µs
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
FPF2123-FPF2125 Rev. C4
4 www.fairchildsemi.com
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