APW7290 Datasheet, PDF (1/18 Pages) Anpec Electronics Coropration – 1.5MHz, 1A Synchronous Buck Regulator

APW7290
1.5MHz, 1A Synchronous Buck Regulator
Features
General Description
• 1A Output Current
• Support 4 AA alkaline, NiCd or NiMH batteries
• Wide 3.5V~7.2V Input Voltage
• Fixed 1.5MHz Switching Frequency
• Low Dropout Operating at 100% duty cycle
• Low 25µA Quiescent Current
• Integrate Synchronous Rectifier
• 0.6V Low Reference Voltage
• <0.5µA Input Current during Shutdown
• Current-Mode Operation with Internal
Compensation
- Stable with Ceramic Output Capacitors
- Fast Line Transient Response
• Short-Circuit Protection
• Over-Temperature Protection with Hysteresis
• Available in TDFN2x2-8 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• E-Book
• Toy
• Portable Instrument
The APW7290 is a high efficiency monolithic synchro-
nous buck regulator. APW7290 operates with a constant
1.5MHz switching frequency and using the inductor cur-
rent as a controlled quantity in the current mode
architecture. The 3.5V to 7.2V input voltage range makes
the APW7290 ideally suited for single Li-Ion battery pow-
ered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable electrical
devices. The internally fixed 1.5MHz operating frequency
allows the use of small surface mount inductors and
capacitors. The synchronous switches included inside
increase the efficiency and eliminate the need for an ex-
ternal Schottky diode.
The APW7290 is available in TDFN2x2-8 package.
Pin Configuration
GND 1
VIN 2
RUN 3
LBI 4
8 LBO
7 SW
6 VOUT
5 FB
TDFN2x2-8
(Top View)
Simplified Application Circuit
1 _GND
Low Battery
Output
R3
VIN
C1
ON
OFF
2 _VIN
LBO ⁸
3 _RUN
SW ⁷
VOUT ⁶
R4
4 _LBI
FB ⁵
R5
APW7290
L1
R1
R2
VOUT
C2
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.2 - Jun., 2013
www.anpec.com.tw