FAN5230 Datasheet, PDF (2/16 Pages) Fairchild Semiconductor – System Electronics Regulator for Mobile PCs

FAN5230
Typical Application
3.3V-ALWAYS@50mA
5V-ALWAYS
3.3V @ 5A
+
5V-ALWAYS@ 50mA
SDN3.3
PGOOD
Vin = 5.4-24V
FAN5230
1 VIN
CPUMP5 24
2 3.3 ALW
HSD5 23
3 CPUMP3.3
SW5 22
4 HSD3.3
ISEN5 21
5 SW3.3
6 5V-ALW
7 LSD3.3
8 GND3.3
9 ISEN3.3
LSD5 20
GND5 19
VFB5 18
SDN5 17
SW12 16
10 VFB3.3
11 SDN3.3
12 PGOOD
VFB12 15
SGND 14
SDWN 13
SDN5
VFB12
SDWN
5V-ALWAYS
5V @ 5A
+
12V @ 120mA
+
Pin Assignments
VIN
3.3V-ALWAYS
CPUMP3.3
HSD3.3
SW3.3
5V-ALWAYS
LSD3.3
GND3.3
ISEN3.3
VFB3.3
SDN3.3
PGOOD
Top View
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
CPUMP5
HSD5
SW5
ISEN5
LSD5
GND5
VFB5
SDN5
SW12
VFB12
SGND
SDWN
Pin Description
Pin Name
VIN
3.3V-ALWAYS
CPUMP3.3
HSD3.3
SW3.3
5V-ALWAYS
Pin Number Pin Function Description
1
Input power.
2
3.3V Always on linear regulator. Load current on pins 2 and 6 must not exceed
50mA total. This pin should be decoupled to ground with a 10µF capacitor.
3
Charge Pump 3.3V. High side Gate drive voltage for 3.3V. This pin is to be
connected to SW3.3 through a 100nF cap. and to 5V-ALWAYS through a diode
4
High-side gate driver for 3.3V. Connect this pin directly to the gate of an
N-channel MOSFET. The trace from this pin to the MOSFET gate should be < 1".
5
High side FET Source and Low Side FET Drain Switching Node. Switching
node for 3.3V.
6
5V Always on linear regulator output. The sum of the load currents on pins 2
and 6 must not exceed 50mA total. This pin should be decoupled to ground with
a 10µF capacitor.
2
REV. 2.8.5 10/17/01