FPF2124.pdf 데이터시트 (총 13 페이지) - 파일 다운로드 FPF2124 데이타시트 다운로드

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August 2005
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
Typical Application Circuit
General Description
The FPF2123, FPF2124, and FPF2125 are a series of load
switches which provides full protection to systems and loads
which may encounter large current conditions. These devices
contain a 0.125current-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
OFF ON
VIN VOUT
FPF2123 - FPF2125
ON ISET
GND
TO LOAD
©2005 Fairchild Semiconductor Corporation
FPF2123-FPF2125 Rev. C
1
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Functional Block Diagram
VIN
UVLO
ON
CONTROL
LOGIC
THERMAL
SHUTDOWN
CURRENT
LIMIT
REVERSE
CURRENT
BLOCKING
VOUT
ISET
GND
Pin Configuration
VIN 1
5 VOUT
GND 2
ON 3
4 ISET
SOT23-5
Pin Description
Pin Name
1 VIN
2 GND
3 ON
4 ISET
5 VOUT
Function
Supply Input: Input to the power switch and the supply voltage for the IC
Ground
ON Control Input
Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch.
Switch Output: Output of the power switch
FPF2123-FPF2125 Rev. C
2
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Absolute Maximum Ratings
Parameter
VIN, VOUT, ON, ISET to GND
Power Dissipation @ TA = 25°C (note 1)
Operating Temperature Range
Storage Temperature
Thermal Resistance, Junction to Ambient
Electrostatic Discharge Protection
HBM
MM
Min.
-0.3
-40
-65
4000
400
Max.
6
667
125
150
150
Unit
V
mW
°C
°C
°C/W
V
V
Recommended Operating Range
Parameter
VIN
Ambient Operating Temperature, TA
Min.
1.8
-40
Max.
5.5
85
Unit
V
°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.
Basic Operation
Operating Voltage
Quiescent Current
Shutdown Current
Reverse Block Leakage Current
Latch-Off Current
On-Resistance
ON Input Logic High Voltage (ON)
ON Input Logic Low Voltage
ON Input Leakage
Off Switch Leakage
Protections
VIN
IQ
ISHDN
IBLOCK
ILATCHOFF
RON
VIH
VIL
ISWOFF
IOUT = 0mA
VIN = 1.8 to 3.3V
VIN = 3.3 to 5.5V
FPF2124
TA = 25°C, IOUT = 50mA
TA = -40 to +85°C, IOUT = 50mA
VIN = 1.8V
VIN = 5.5V
VIN = 1.8V
VIN = 5.5V
VON = VIN or GND
VON = 0V, VOUT = 0V
1.8
0.75
1.30
75
80
50
125
150
Current Limit
ILIM VIN = 3.3V, VOUT = 3.0V,
RSET=576
600 800
Min. Current Limit
Thermal Shutdown
ILIM(min.)
VIN = 3.3V, VOUT = 3.0V
Shutdown Threshold
150
140
Return from Shutdown
130
Hysteresis
10
Under Voltage Shutdown
UVLO
Under Voltage Shutdown Hysteresis
VIN Increasing
1.5 1.6
50
Max Units
5.5 V
µA
120
2 µA
1 µA
µA
160 m
V
0.5 V
1.0
1 µA
1 µA
1000
mA
mA
°C
1.7 V
mV
FPF2123-FPF2125 Rev. C
3
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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.
Dynamic
Turn on time
Turn off time
VOUT Rise Time
VOUT Fall Time
Over Current Blanking Time
Auto-Restart Time
tON
tOFF
tR
tF
tBLANK
tRESTART
RL=500, CL=0.1uF
RL=500, CL=0.1uF
RL=500, CL=0.1uF
RL=500, CL=0.1uF
FPF2123, FPF2124
FPF2123
FPF2124, FPF2125
25
70
12
200
5 10
80 160
NA
Short Circuit Response Time
VIN = VON = 3.3V. Moderate
Over-Current Condition.
3
VIN = VON = 3.3V. Hard Short.
20
Max Units
µs
µs
µs
µs
20 ms
320 ms
µs
ns
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.
FPF2123-FPF2125 Rev. C
4
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Typical Characteristics
76
VON = VIN
74
72
70
68
66
64
62
1.5
2 2.5 3 3.5 4 4.5 5 5.5
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
6
95
85
75
VIN = 5.5V VIN = 3.3V
65 VIN = 1.8V
55
45
-40
-15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 2. Quiescent Current vs. Temperature
85
2500
I_SHDN
2000
1500
VIN = 5.5V
1000
500
VIN = 3.3V
0
-40 -15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
Figure 3. ISHUTDOWN Current vs. Temperature
500
450 I_SWOFF
400
350
300 VIN = 5.5V
250
200
150
100
50 VIN = 3.3V
0
-40 -15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 4. ISWITCH-OFF Current vs. Temperature
85
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
1.5
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
Figure 5. Reverse Current vs. VOUT
6.0
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-40
VIN = 5.5V
VIN = 3.3V
-15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
Figure 6. Reverse Current vs. Temperature
FPF2123-FPF2125 Rev. C
5
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