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SP6120_05 Datasheet (HTML) - Sipex Corporation

Part No. SP6120_05
Description  Low Voltage, AnyFETTM, Synchronous,Buck Controller Ideal for 2A to 10A, High Performance, DC-DC Power Converters
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Maker  SIPEX [Sipex Corporation]
Homepage  http://www.sipex.com
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 5 page
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5
Date: 1/21/05
SP6120 Low Voltage, AnyFETTM, Synchronous, Buck Controller
© Copyright 2005 Sipex Corporation
BLOCK DIAGRAM
APPLICATION SCHEMATIC
Figure 1. Schematic 3.3V to 1.9V Power Supply
QT, QB = FAIRCHILD FDS6690A
L1 = PANASONIC ETQP6F2R5SFA
DS = STMICROELECTRONICS STPS2L25U
+
-
+
-
-
+
-
+
-
+
-
+
-
+
+
-
Synchronous
Driver
Driver
Logic
Soft Start
& Hiccup Logic
S
Q
R
Set Dominant
Fault Latch
S
Q
R
Program
Logic
Window
Comparator
Logic
+
-
TOFF
ENABLE
GND
VFB
COMP
VCC
ISP
ISN
Reference
SS
2.85 VON
2.75 VOFF
430mV
3
4
2
13
5
6
10
SS
2V
VFB 3% Low ENABLE
VFB
1.25V
GM
Error Amplifier
VFB
Zero crossing detect
250mV
SS
7
ICHARGE
0.65V
12
8
PGND
ROSC
11
14
15
16
9
Continuous/
Discontinuous
NFET/PFET
ON 100%
OFF 100%
RESET
Dominant
PWM Latch
QPWM
FAULT
F (kHz) = 5.7E6/ROSC (Ω)
+
-
10µs
OVC
UVLO
1V RAMP
3%
3%
- +
PROG
BST
GH
SWN
-
+
GL
x 10
C
IN = SANYO 6TPB330M
C
OUT = SANYO 4TPB470M
SP6120
NC
ENABLE
ISP
ISN
VFB
COMP
SS
ROSC
BST
GH
SWN
GND
PGND
GL
VCC
PROG
®
®
NMOS High Side Drive
PROG = GND
ENABLE
CP
100pF
CZ
4.7nF
RZ
15k
CSS
0.33µF
ROSC
18.7k
CVCC
2.2µF
VIN
MBR0530
CBST
1µF
QT
3.3V
VIN
CIN
330µF x 2
RS
22.1k
CS
39nF
L1
2.5µH
1.9V
1A to 8A
VOUT
RF
5.23k
COUT
470µF x 3
RI
10k
QB
DS
CB
1µF



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