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| 型号： | LTC3499EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 0.75A 8DFN |
| 标准包装： | 121 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 6 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 750mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3499/LTC3499B
750mA Synchronous
Step-Up DC/DC Converters
with Reverse-Battery Protection
Reverse-Battery Protection for DC/DC Converter
High Efficiency: Up to 94%
Generates 5V at 175mA from a 1.8V Input
Operates from 1.8V to 5.5V Input Supply
2V to 6V Adjustable Output Voltage
Inrush Current Controlled During Start-Up
Output Disconnnect in Shutdown
Low Noise 1.2MHz PWM Operation
Tiny External Components
Automatic Burst Mode ? Operation (LTC3499)
Continuous Switching at Light Loads (LTC3499B)
Overvoltage Protection
8-Lead (3mm × 3mm × 0.75mm) DFN
Medical Equipment
Digital Cameras
MP3 Players
Handheld Instruments
FEATURES
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and MSOP Packages
APPLICATIONS
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L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Two AA Cells to 5V Synchronous Boost Converter
DESCRIPTION
The LTC ? 3499/LTC3499B are synchronous, fixed frequency
step-up DC/DC power converters with integrated reverse
battery protection that protect and disconnect the devices
and load when the battery polarity is reversed while
delivering high efficiency in a small (3mm × 3mm) DFN
package. True output disconnect eliminates inrush current
and allows zero load current in shutdown.
The devices feature an input voltage range of 1.8V to 5.5V
enabling operation from two alkaline or NiMH batteries. The
switching frequency is internally set at 1.2MHz allowing
the use of tiny surface mount inductors and capacitors.
A minimal number of external components are required
to generate output voltages ranging from 2V to 6V. The
LTC3499 features automatic Burst Mode operation to
increase efficiency at light loads, while the LTC3499B
features continuous switching at light loads.
The soft-start time is externally programmable through a
small capacitor. Anti-ring circuitry reduces EMI emissions
by damping the inductor in discontinuous mode. The de-
vices feature <1μA shutdown supply current, integrated
overvoltage protection and are available in both 8-pin
(3mm × 3mm) DFN and 8-pin MSOP packages.
Battery Current vs V IN
V IN
1.8V TO 3.2V
+
2.2μF
V IN
4.7μH
SW
1.0
0.5
SHDN = 0V
V OUT = 0V
100k
ON OFF
LTC3499
V OUT
SHDN
VC
FB
SS
GND
1M
324k
V OUT
5V
175mA
10μF
0
–0.5
330pF
0.01μF
3499 TA01
–1.0
–6
–4
–2
0
2
4
6
V IN AND SW VOLTAGE (V)
3499 TA01b
3499fc
1
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| LTC3499EMS8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection |
| LTC3499EMS8#PBF | 功能描述:IC REG BST SYNC ADJ 0.75A 8MSOP 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 |
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| LTC3520EUF#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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