FAN5235 Datasheet, PDF (3/15 Pages) Fairchild Semiconductor – System Electronics Regulator for Mobile PCs

FAN5235
Pin Description (Continued)
Pin Name
ISEN5
SW5
HSD5
CPUMP5
Pin Number Pin Function Description
21
Current Sense for 5V. This pin should be connected to the drain of the bottom
Mosfet using appropriate resistor and RC filter. See Application Section.
22
High Side Driver Source and Low Side Driver Drain Switching Node.
Switching node for 5V.
23
High side FET driver for 5V. Connect this pin directly to the gate of an N-channel
MOSFET. The trace from this pin to the MOSFET gate should be < 1".
24
Charge Pump 5V. High side Gate drive voltage for 5V. High side Gate drive
voltage for 5V. This pin is to be connected to SW5 through a 100nF cap. and to
5V-ALWAYS through a diode.
Absolute Maximum Ratings¹
Parameter
Conditions
Min.
V_IN
-0.3
SW, ISEN Pins,SDWN Pin
-0.3
CPUMP, HSD Pins
-0.3
SDN, VFB, V_always pins
-0.3
CPUMP to SW pins, and all other pins
-0.3
The sum of the load currents on pins 2 and 6 must not exceed 60mA total
Typ.
Max.
27
27
33
6.5
6.5
Units
V
V
V
V
V
Note:
1. Stresses beyond "Absolute Maximum Ratings" may cause permanent device damage. Continuous exposure to absolute
maximum rating conditions may affect device reliability. Functional operation of the device at these or any other conditions
beyond those indicated in the operational sections of the specification is not implied.
Recommended Operating Conditions
Input Voltage, V_IN
Ambient Temperature, T_A
+5.4V to 24V
-20°C to 85°C
Thermal Information
Thermal Resistance, θ_JA
Thermal Resistance, θ_JC
QSOP
TSSOP
Maximum Junction Temperature
Storage Temperature Range
Maximum Lead Temperature, Soldering 10 Sec
88°C/W
28.5°C/W
16°C/W
150°C
-65°C to 150°C
300°C
REV. 1.3.3 1/3/02
3