BL3406B
1.5 MHz, 800mA 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: 180µA
Over temperature Protection
Short Circuit Protection
Shutdown Quiescent Current < 1µA
Space Saving 5-Pin Thin SOT23 Package
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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.
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
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
TYPICAL APPLICATION
2.7V - 4.2V
V
IN
C1
4.7uF
4
V
IN
SW
3
L1
2.2 H
V
OUT
1.8V
C2
10uF
BL3406B-ADJ
1
C3
22pF
Run
GND
2
V
FB
5
R2
200k
R1
100k
Figure 1. BL3406B-ADJ Typical Application Circuit
PPMIC BU
BL3406B Rev 1.5
10/2009
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