BL3406B Datasheet, PDF (1/11 Pages) SHANGHAI BELLING CO., LTD. – 1.5 MHz, 800mA Synchronous Buck Converter

BL3406B
1.5 MHz, 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
• 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: 180µA
• Over temperature Protection
• Short Circuit Protection
• Shutdown Quiescent Current < 1µA
• Space Saving 5-Pin Thin SOT23 Package
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
ORDERING INFORMATION
BL3406B –XX X XXX
Package：
TRN: TSOT23-5
RN: SOT23-5
Features:
P: Standard (default,
lead free)
C: Customized
Output Voltage：
10: 1.0V
12: 1.2V
15: 1.5V
18: 1.8V
25: 2.5V
33: 3.3V
AD: Adjustable
• GPS Receivers
DESCRIPTION
The BL3406B 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 BL3406B 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.
The BL3406B 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.
TYPICAL APPLICATION
2.7V - 4.2V
VIN
C1
4.7uF
4 _VIN
L1
SW ^{3 2.2µH}
BL3406B-ADJ
C3
22pF
1 _Run
V_FB ⁵
R2
GND
200k
R1
100k
2
V_OUT1.8V
C2
10uF
Figure 1. BL3406B-ADJ Typical Application Circuit
PPMIC BU
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BL3406B Rev 1.5
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10/2009
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