鈻?/div>
Programmable over current protection with adjustable latch-
off delay
Description
The FAN5182 is a highly ef鏗乧ient 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
ef鏗乧iency. 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 speci鏗乪d over the commercial temperature range of
0擄C to +85擄C and is available in a 20-lead QSOP package.
Applications
鈻?/div>
Auxiliary supplies
鈻?/div>
DDR memory supplies
鈻?/div>
Point-of-load supplies
Block Diagram
VCC
1
RAMPADJ
9
RT
8
FAN5182
UVLO
SHUTDOWN
& BIAS
EN
6
OSCILLATOR
SET
RESET
EN
20
PWM1
+
GND
14
950mV
FB
鈥?/div>
+
鈥?/div>
CMP
CURRENT
BALANCING
CIRCUIT
+
+
鈥?/div>
CMP
RESET
1/ 2 / 3-PHASE
DRIVER LOGIC
RESET
19
PWM2
+
鈥?/div>
CMP
18
PWM3
650mV
鈥?/div>
CROWBAR
DELAY
CURRENT
LIMIT
PWRGD
5
1.05V
FB
鈥?/div>
+
17
SW1
16
SW2
15
SW3
ILIMIT
10
EN
CURRENT
LIMIT
CIRCUIT
SOFT
START
鈥?/div>
+
12
CSSUM
DELAY
7
11
CSREF
13
CSCOMP
鈥?/div>
3
COMP
4
FB
+
800 mV
REFERENCE
2
FBRTN
漏2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FAN5182 Rev. 1.0.1
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