BL9310
1.5 MHz, 1A Synchronous Buck Converter
FEATURES
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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
1.0V,1.2V,1.5V,1.8V,2.5V and 3.3V
Fixed/Adjustable Output Voltage
100% Duty Cycle in Dropout Mode
Low Quiescent Current: 200µA
Over temperature Protection
Short Circuit Protection
Shutdown Quiescent Current < 1µA
Space Saving 5-Pin Thin SOT23 Package
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Portable Instruments
GPS Receivers
DESCRIPTION
The BL9310 is a 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 BL9310 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 200µA at no load, and drops to <
1µA in shutdown. Pulse Skipping Mode
operation increases efficiency at light loads,
further extending battery life. The BL9310 is
offered in a low profile (1mm) 5-pin, thin
SOT23 package, and is available in an
adjustable version and fixed output versions
of 1.0V, 1.2V, 1.5V , 1.8V, 2.5V and 3.3V.
APPLICATIONS
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Cellular and Smart Phones
Wireless Handsets and DSL Modems
Microprocessors and DSP Core Supplies
PDAs
Digital Still and Video Cameras
MP3/MP4/MP5 Players
ORDERING INFORMATION
BL9310 –XX X XXX
Package
TRN: TSOT23-5
RN: SOT23-5
Features:
P: Standard (default,
lead free)
C: Customized
TYPICAL APPLICATION
PPMIC BU
BL9310 Rev 1.1
1/2011
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2011 Belling All Rights Reserved
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Output Voltage
10: 1.0V
12: 1.2V
15: 1.5V
18: 1.8V
25: 2.5V
33: 3.3V
AD: Adjustable
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Figure 1. BL9310-ADJ Typical Application Circuit
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