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參數資料
| 型號： | FAN5235 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | System Electronics Regulator for Mobile PCs |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | QSOP-24 |
| 文件頁數： | 2/15頁 |
| 文件大小： | 85K |
| 代理商： | FAN5235 |
FAN5235
2
REV. 1.3.3 1/3/02
Pin Assignments
Pin Description
Pin Name
VIN
3.3V-ALWAYS
Pin Number Pin Function Description
1
Input power.
2
3.3V Always on linear regulator.
50mA total.
3
Charge Pump 3.3V.
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.
node for 3.3V.
6
5V Always on linear regulator output.
and 6 must not exceed 50mA total.
7
Low-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".
8
Ground for 3.3V MOSFET.
9
Current sense for 3.3V.
This pin should be connected to the Drain of the bottom
Mosfet with an appropriate resistor and an RC filter. See Application Section.
10
Voltage feedback for 3.3V.
11
Soft Start and ON/OFF for 3.3V.
open collector device for control.
12
Power Good Flag.
An open collector output that will be logic low if any output
voltage is not above 89% of the nominal output voltage.
13
Master Shutdown.
Shutdown for all power. Off when low. When high
5V/3.3V-ALWAYS are ON while 5V/3.3V-Main are ready to turn on if SDN5,
SDN3.3 go open.
14
Signal ground.
15
Voltage feedback for 12V.
16
FET driver for 12V Boost.
17
Enable/Soft Start for 5V and 12V.
OFF=Grounded. ON=open with SDWN=High.
18
Voltage feedback for 5V.
19
Ground for 5V MOSFET.
20
Low 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".
Load current on pins 2 and 6 must not exceed
CPUMP3.3
High side Gate drive voltage for 3.3V. This pin is to be
HSD3.3
SW3.3
Switching
5V-ALWAYS
The sum of the load currents on pins 2
LSD3.3
GND3.3
ISEN3.3
VFB3.3
SDN3.3
OFF=GND. ON=open with SDWN=High. Use
PGOOD
SDWN
SGND
VFB12
SW12
SDN5
Soft start and ON/OFF for 5V & 12V.
VFB5
GND5
LSD5
1
2
3
4
5
6
7
8
9
10
11
12
Top View
24
23
22
21
20
19
18
17
16
15
14
13
VIN
3.3V-ALWAYS
CPUMP3.3
HSD3.3
5V-ALWAYS
LSD3.3
GND3.3
SW3.3
ISEN3.3
VFB3.3
SDN3.3
PGOOD
CPUMP5
HSD5
SW5
ISEN5
LSD5
GND5
VFB5
SDN5
SW12
VFB12
SGND
SDWN
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