BL9328 Datasheet, PDF (1/10 Pages) SHANGHAI BELLING CO., LTD. – 1.5 MHz, Dual 800mA Synchronous Buck Converter

BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
FEATURES
• High Efficiency: Up to 96%
• 1.5MHz Constant Switching Frequency
• Current Mode Operation for Excellent
Line and Load Transient Response
• No Schottky Diode Required
• 2.5V to 5.5V Input Voltage Range
• Adjustable Output Voltage
• 100% Duty Cycle in Dropout Mode
• Output Current:Up to 800mA per Channel
• Low Quiescent Current: 180μA each
• Over temperature Protection
• Short Circuit Protection
• Shutdown Quiescent Current < 1μA
• Compact and thermally enhanced
Package:ESOP-8
APPLICATIONS
• Cellular and Smart Phones
• Wireless Handsets and DSL Modems
• Microprocessors and DSP Core Supplies
• PDAs
• Digital Still and Video Cameras
• MP3/MP4/MP5 Players
• Portable Instruments
• GPS Receivers
ORDERING INFORMATION
BL9328 – X XXXX
Package：
ESPA: ESOP-8-A
ESPB: ESOP-8-B
Features:
P: Standard (default,
lead free)
C: Customized
DESCRIPTION
The BL9328 is a dual constant frequency,
1.5MHz, slope compensated current mode
PWM step-down converter working under an
input voltage range of 2.5V to 5.5V. This
feature makes the BL9328 suitable for single
cell Li-ion battery-powered applications. The
internal synchronous rectifier is desired to
increase efficiency without an external
Schottky diode. 100% duty cycle capability
extends battery life in portable devices, while
the quiescent current is 180μA at no load,
and drops to < 1μA in shutdown. Pulse
Skipping Mode operation increases efficiency
at light loads, further extending battery life.
Low output voltage ripple and small external
inductor and capacitor sizes are achieved
with 1.5MHz switching frequency. The
BL9328 is offered in a compact and thermally
enhanced ESOP-8 package, and is available
in an adjustable version.
TYPICAL APPLICATION
Figure 1. BL9328-ADJ Typical Application Circuit
PPMIC BU
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BL9328 Rev 0.3
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6/2010
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