APW7137 Datasheet, PDF (1/18 Pages) Anpec Electronics Coropration – 1MHz, High Efficiency, Step-Up Converter with Internal FET Switch

APW7137
1MHz, High Efficiency, Step-Up Converter with Internal FET Switch
Features
General Description
• Wide 2.5V to 6V Input Voltage Range
• Built-in 0.6Ω N-Channel MOSFET
• Built-in Soft-Start
• High Efficiency up to 90%
• <1µA Quiescent Current During Shutdown
• Current-Mode Operation
- Stable with Ceramic Output Capacitors
- Fast Transient Response
• Current-Limit Protection
• Over-Temperature Protection with Hysteresis
• Available in a Tiny 5-Pin SOT-23 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Cell Phone and Smart Phone
• PDA, PMP, MP3
• Digital Camera
• Boost Regulators
The APW7137 is a fixed switching frequency (1MHz
typical), current-mode, step-up regulator with an inte-
grated N-channel MOSFET. The device allows the usage
of small inductors and output capacitors for portable
devices. The current-mode control scheme provides fast
transient response and good output voltage accuracy.
The APW7137 includes under-voltage lockout, current
limit, and over-temperature shutdown preventing dam-
age in the event of an output overload.
100
90
80
70
60
50
40
30
20
10
0
0.1
V_IN=5V
V_IN=3.3V
V_OUT=12V
1
10
100
1000
Pin Configuration
Simplified Application Circuit
LX 1
GND 2
FB 3
5 VIN
4 EN
SOT-23-5 (Top View)
V_IN
5V
C1
4.7µF
ON
OFF
L1
10µH
5 _VIN
LX ¹
2 _GND
APW7137
4 _EN
FB ³
R1
1.2MΩ
V_OUT
12V
C2
4.7µF
R2
137kΩ
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
1
Rev. A.4 - Oct., 2008
www.anpec.com.tw