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參數資料
| 型號： | FAN5182QSCX_NL |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Adjustable Output 1, 2, or 3-Phase Synchronous Buck Controller |
| 中文描述： | SWITCHING CONTROLLER, 3000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | LEAD FREE, MO-137AD, QSOP-20 |
| 文件頁數： | 1/18頁 |
| 文件大?。?/td> | 788K |
| 代理商： | FAN5182QSCX_NL |
2005 Fairchild Semiconductor Corporation
FAN5182 Rev. 1.0.1
1
www.fairchildsemi.com
May 2005
F
FAN5182
Adjustable Output 1, 2, or 3-Phase Synchronous Buck
Controller
Features
■
Selectable 1-, 2-, or 3-phase operation at up to 1MHz per
phase
±2% Worst-case differential sensing error over temperature
Externally adjustable 0.8V to 5V output from a 12V supply
Logic-level PWM outputs for interface to external high-power
drivers
Active current balancing between all phases
Built-in power-good/crowbar functions
Programmable over current protection with adjustable latch-
off delay
■
■
■
■
■
■
Applications
■
Auxiliary supplies
DDR memory supplies
Point-of-load supplies
■
■
Description
The FAN5182 is a highly efficient multi-phase synchronous buck
switching regulator controller optimized for converting a 12V
main supply into a high-current low voltage supply for use in
point-of-load (POL) applications. It uses a multi-loop PWM
architecture to drive the logic-level outputs at a programmable
switching frequency that can be optimized for regulator size and
efficiency. The phase relationship of the output signals can be
programmed to provide 1, 2, or 3-phase operation, allowing for
construction of up to three complementary interleaved buck
switching stages.
The FAN5182 also provides accurate and reliable over-current
protection and adjustable current limiting.
FAN5182 is specified over the commercial temperature range of
0°C to +85°C and is available in a 20-lead QSOP package.
Block Diagram
VCC
800 mV
REFERENCE
SOFT
START
DELAY
UVLO
SHUTDOWN
& BIAS
OSCILLATOR
–
+
GND
FAN5182
14
EN
6
DELAY
7
ILIMIT
10
PWRGD
5
1
RT
8
RAMPADJ
9
PWM2
19
3
FB
PWM3
18
SW1
17
CSSUM
12
CSCOMP
13
SW2
16
SW3
15
CSREF
11
PWM1
FBRTN
2
COMP
4
950mV
–
+
1.05V
–
+
650mV
+
–
FB
FB
EN
CURRENT
LIMIT
CIRCUIT
CROWBAR
CURRENT
LIMIT
+
–
CMP
+
–
CMP
–
+
+
–
CMP
CURRENT
BALANCING
CIRCUIT
1/ 2 / 3-PHASE
DRIVER LOGIC
EN
SET
RESET
RESET
RESET
20
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