参数资料
型号: LTC3402EMS#PBF
厂商: Linear Technology
文件页数: 1/16页
文件大小: 0K
描述: IC REG BOOST SYNC ADJ 2A 10MSOP
标准包装: 50
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 2.6 V ~ 5.5 V
输入电压: 0.5 V ~ 5 V
PWM 型: 电流模式,混合
频率 - 开关: 2MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 管件
供应商设备封装: 10-MSOP
产品目录页面: 1334 (CN2011-ZH PDF)
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: 38 μ A (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: < 1 μ A
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 0.16 Ω N-channel MOSFET
switch and a 0.18 Ω 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 38 μ A 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 1 μ A shutdown, antiringing con-
APPLICATIO S
trol, open-drain power good output, thermal shutdown
and current limit. The LTC3402 is available in the 10-lead
Cellular Telephones
Handheld Computers
MP3 Players
2-Way Pagers
GPS Receivers
Battery Backup Supplies
CCFL Backlights
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.
TYPICAL APPLICATIO
All Ceramic Capacitor 2-Cell to 3.3V at 1A Step-Up Converter
Efficiency
V IN = 1.8V to 3V
L1
2.2 μ H
V OUT
3.3V
100
90
Burst Mode
OPERATION
+ 2
CELLS
C1
10 μ F
3
10
2
6
1
LTC3402
V IN SW
SHDN V OUT
MODE/SYNC FB
PGOOD V C
R t GND
4
7
8
9
5
C3
470pF
R2
909k
R1
549k
1A
C2
44 μ F
(2 × 22 μ F)
80
70
60
50
40
30
20
10
1MHz
CONSTANT
FREQUENCY
R t
30.1k
R5
82k
C4
4.7pF
0
V IN = 2.4V WITH SCHOTTKY
0.1 1 10
100
1000
I OUT (mA)
0 = FIXED FREQ
1 = Burst Mode OPERATION
C1: TAIYO YUDEN JMK212BJ106MG
C2: TAIYO YUDEN JMK325BJ226MM
L1: COILCRAFT: D03316P-222
3402 TA01
3402 TA02
3402fb
1
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