参数资料
型号: LTC3440EDD#TRPBF
厂商: Linear Technology
文件页数: 1/20页
文件大小: 0K
描述: IC REG BUCK BOOST SYNC ADJ 10DFN
标准包装: 2,500
类型: 降压(降压),升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 2.5 V ~ 5.5 V
输入电压: 2.5 V ~ 5.5 V
PWM 型: Burst Mode?
频率 - 开关: 2MHz
电流 - 输出: 600mA
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-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-DFN(3x3)
LTC3440
Micropower Synchronous
Buck-Boost DC/DC Converter
FEATURES
DESCRIPTIO
Single Inductor
Fixed Frequency Operation with Battery Voltages
Above, Below or Equal to the Output
Synchronous Rectification: Up to 96% Efficiency
25 μ A Quiescent Current in Burst Mode ? Operation
Up to 600mA Continuous Output Current
No Schottky Diodes Required (V OUT < 4.3V)
V OUT Disconnected from V IN During Shutdown
2.5V to 5.5V Input and Output Range
Programmable Oscillator Frequency
from 300kHz to 2MHz
Synchronizable Oscillator
Burst Mode Enable Control
<1 μ A Shutdown Current
Small Thermally Enhanced 10-Pin MSOP and
(3mm × 3mm) DFN Packages
The LTC ? 3440 is a high efficiency, fixed frequency, Buck-
Boost DC/DC converter that operates from input voltages
above, below or equal to the output voltage. The topology
incorporated in the IC provides a continuous transfer
function through all operating modes, making the product
ideal for single lithium-ion, multicell alkaline or NiMH
applications where the output voltage is within the battery
voltage range.
The device includes two 0.19 Ω N-channel MOSFET
switches and two 0.22 Ω P-channel switches. Switching
frequencies up to 2MHz are programmed with an external
resistor and the oscillator can be synchronized to an
external clock. Quiescent current is only 25 μ A in Burst
Mode operation, maximizing battery life in portable appli-
cations. Burst Mode operation is user controlled and can
be enabled by driving the MODE/SYNC pin high. If the
APPLICATIO S
MODE/SYNC pin has either a clock or is driven low, then
fixed frequency switching is enabled.
Palmtop Computers
Handheld Instruments
MP3 Players
Digital Cameras
Other features include a 1 μ A shutdown, soft-start con-
trol, thermal shutdown and current limit. The LTC3440 is
available in the 10-pin thermally enhanced MSOP and
(3mm × 3mm) DFN packages.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
Protected by U.S. Patents including 6404251, 6166527.
TYPICAL APPLICATIO
Li-Ion to 3.3V at 600mA Buck-Boost Converter
Efficiency vs V IN
V IN = 2.7V TO 4.2V
3
7
L1
10 μ H
SW1 SW2
LTC3440
V IN V OUT
4
6
R1
340k
V OUT
3.3V
600mA
100
V OUT = 3.3V
98 I OUT = 100mA
96 f OSC = 1MHz
94
92
15k
Li-Ion
+
C1 *
10 μ F
8
2
1
R T
SHDN/SS
MODE/SYNC
R T
FB
V C
GND
9
C5 1.5nF
10
5
R3
R2
200k
C2
22 μ F
90
88
86
84
82
60.4k
80
*1 = Burst Mode OPERATION
0 = FIXED FREQUENCY
C1: TAIYO YUDEN JMK212BJ106MG
C2: TAIYO YUDEN JMK325BJ226MM
3440 TA01
2.5
3.0
3.5
4.0
V IN (V)
4.5
5.0
5.5
L1: SUMIDA CDRH6D38-100
3440 TA02
3440fb
1
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LTC3440EMS 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON(1.45x1) 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2
LTC3440EMS#PBF 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON(1.45x1) 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2
LTC3440EMS#TR 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V,1.5V,1.8V,2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP,10-MSOP(0.118",3.00mm 宽)裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘
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LTC3440EMSPBF 制造商:Linear Technology 功能描述:LTC3440 adj 600mA SU/SD dc-dc converter