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LTC3402

Description
2A, 3MHz Micropower Synchronous Boost Converter
File Size226KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3402 Overview

2A, 3MHz Micropower Synchronous Boost Converter

LTC3402
2A, 3MHz Micropower
Synchronous Boost Converter
FEATURES
DESCRIPTIO
Synchronous Rectification: Up to 97% Efficiency
2A Switch Current Rating
Fixed Frequency Operation Up to 3MHz
Wide Input Range: 0.5V to 5V
Very Low Quiescent Current: 38μA (Burst Mode
®
Operation)
2.6V to 5.5V Adjustable Output Voltage
0.85V (Typ) Start-Up Voltage
No External Schottky Diode Required (V
OUT
< 4.3V)
Synchronizable Switching Frequency
Burst Mode Enable Control
Antiringing Control Reduces Switching Noise
PGOOD Output
OPTI-LOOP
®
Compensation
Very Low Shutdown Current: < 1μA
Small 10-Pin MSOP Package
The LTC
®
3402 is a high efficiency, fixed frequency, step-
up DC/DC converter that operates from an input voltage
below 1V. The device includes a 0.16Ω N-channel MOSFET
switch and a 0.18Ω P-channel synchronous rectifier.
Switching frequencies up to 3MHz are programmed with
an external timing resistor and the oscillator can be
synchronized to an external clock. An external Schottky
diode is optional but will slightly improve efficiency.
Quiescent current is only 38μA in Burst Mode operation,
maximizing battery life in portable applications. Burst
Mode operation is user controlled and can be enabled by
driving the MODE/SYNC pin high. If the MODE/SYNC pin
has either a clock or is driven low, then fixed frequency
switching is enabled.
Other features include a 1μA shutdown, antiringing con-
trol, open-drain power good output, thermal shutdown
and current limit. The LTC3402 is available in the 10-lead
thermally enhanced MSOP package. Lower current appli-
cations should use the 1A rated LTC3401 synchronous
boost converter. Applications that require V
OUT
< 2.6V
should use the LTC3424.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
APPLICATIO S
Cellular Telephones
Handheld Computers
MP3 Players
2-Way Pagers
GPS Receivers
Battery Backup Supplies
CCFL Backlights
TYPICAL APPLICATIO
V
IN
= 1.8V to 3V
L1
2.2μH
All Ceramic Capacitor 2-Cell to 3.3V at 1A Step-Up Converter
100
V
OUT
3.3V
1A
90
80
EFFICIENCY (%)
Burst Mode
OPERATION
1MHz
CONSTANT
FREQUENCY
3
10
LTC3402
V
IN
SHDN
SW
V
OUT
4
7
8
9
5
C3
470pF
R5
82k
R2
909k
C2
44μF
(2
×
22μF)
R1
549k
C4
4.7pF
70
60
50
40
30
20
10
0
+
2
CELLS
2
6
MODE/SYNC FB
PGOOD
R
t
V
C
GND
C1
10μF
1
R
t
30.1k
V
IN
= 2.4V WITH SCHOTTKY
0.1
1
10
I
OUT
(mA)
100
1000
3402
TA02
C1: TAIYO YUDEN JMK212BJ106MG
0 = FIXED FREQ
C2: TAIYO YUDEN JMK325BJ226MM
1 = Burst Mode OPERATION
L1: COILCRAFT: D03316P-222
3402 TA01
U
Efficiency
3402fb
U
U
1

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