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SP6138ER1 Datasheet

  • SP6138ER1

  • Synchronous Buck Controller

  • 17頁(yè)

  • SIPEX

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Solved by
SP6138
TM
Synchronous Buck Controller
UV
IN
BST
13
12 GH
11
10
9
V
CC
Now Available in Lead Free Packaging
DESCRIPTION
The SP638 is a synchronous step-down switching regulator controller optimized for small
footprint. The part is designed to be especially attractive for single supply step down con-
version from 5V to 24V. The SP638 is designed to drive a pair of external NFETs using a
fixed 2.5 MHz frequency, PWM voltage mode architecture. Protection features include UVLO,
thermal shutdown, output short circuit protection, and overcurrent protection with auto restart.
The device also features a PWRGD output and an enable input. The SP638 is available in
a space saving 6-pin QFN and offers excellent thermal performance.
TYPICAL APPLICATION CIRCUIT
VIN
C5
0.1uF
DBST
CVCC
4.7uF
SD101AWS
VIN
VCC
R3
10K鈩?/div>
POWERGOOD
NC
ENABLE
PWRGD
UVIN
EN
GND
BST
GH
SWN
RS1
1K鈩?/div>
GL
RS3
4.99K鈩?/div>
ISP
CSP
ISN
COMP
CP1
6 pF
VFB
SS
CSS
47nF
CZ3
47pF
CF1
18pF
CZ2
100pF
RZ2
54.9K鈩?/div>
RZ3
1K鈩?/div>
6.8nF
CS
0.1uF
R1
68.1K鈩? 1%
RS2
1K鈩?/div>
C2
22uF
CBST
0.1uF
MT/MB, Si7214DN
47 m鈩? 30V
(Co-Packaged FETs)
C1
4.7uF
12V
GND
COOPER, SD25-2R2
2.2uH, 2.8A, 31m鈩?/div>
VOUT
SP6138
3.3V
0-2A
PGND
GND
R2
21.5K鈩? 1%
Note: Die-attach paddle is connected to GND
Oct 24-06 Rev J
SP638 Synchronous Buck Controller
漏 2006 Sipex Corporation

PWRGD
FEATURES
鈻?/div>
5V to 24V Input step down converter
鈻?/div>
Up to 3A output in a small form factor
GL
鈻?/div>
Highly integrated design, minimal components
PGND
鈻?/div>
UVLO Detects Both V
CC
and V
IN
鈻?/div>
Overcurrent circuit protection with auto-restart
GND
鈻?/div>
Power Good Output, ENABLE Input
鈻?/div>
Maximum Controllable Duty Cycle Ratio up to 92%
V
FB
鈻?/div>
Wide BW amp allows Type II or III compensation
鈻?/div>
Programmable Soft Start
鈻?/div>
Fast Transient Response
鈻?/div>
Available in 6-Pin QFN package
鈻?/div>
External Driver Enable/Disable
鈻?/div>
U.S. Patent #6,922,04
16
1
2
3
4
15
14
SP6138
16 Pin QFN
3mm x 3mm
V
IN
SW
N
ISP
ISN
5
6
7
8
COMP
EN
SS

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