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参数资料
| 型号： | LM3691TLX-3.3 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.7 A SWITCHING REGULATOR, 4400 kHz SWITCHING FREQ-MAX, PBGA6 |
| 封装： | MICRO, SMD-6 |
| 文件页数： | 1/20页 |
| 文件大小： | 1921K |
| 代理商： | LM3691TLX-3.3 |
LM3691
September 8, 2011
High Accuracy, Miniature 1A, Step-Down DC-DC Converter
for Portable Applications
General Description
The LM3691 step-down DC-DC converter is optimized for
powering ultra-low voltage circuits from a single Li-Ion cell or
3 cell NiMH/NiCd batteries. It provides up to 1A load current,
over an input voltage range from 2.3V to 5.5V. There are sev-
eral different fixed voltage output options available.
LM3691 has a mode-control pin that allows the user to select
Forced PWM mode or ECO mode that changes modes be-
tween gated PWM mode and PWM automatically depending
on the load. In ECO, LM3691 offers superior efficiency and
very low I
q under light load conditions. ECO mode extends the
battery life through reduction of the quiescent current during
light load conditions and system standby.
The LM3691 is available in a 6-bump micro SMD package.
Only three external surface-mount components, a 1
μH in-
ductor, a 4.7
μF input capacitor and a 4.7 μF output capacitor,
are required.
Features
■ V
OUT = 0.75V to 3.3V
■ ±1% DC output voltage precision
■ 2.3 ≤ V
IN ≤ 5.5V
■ 4 MHz switching frequency
■ 64 μA (typ.) quiescent current in ECO mode
■ 1A maximum load capability
■ Automatic ECO/PWM mode switching
■ Mode Pin to select ECO/Forced PWM mode
■ 1 μH inductor, 4.7 μF input capacitor (0603(1608) case
size) and 4.7
μF output capacitor (0603(1608) case size)
■ Current overload and thermal shutdown protections
■ Only three tiny surface-mount external components
required (solution size less than 15 mm2)
Applications
■ Mobile Phones
■ Hand-Held Radios
■ MP3 players
■ Portable Hard Disk Drives
Typical Application Circuit
30013430
FIGURE 1. Typical Application Circuit
Efficiency vs. Output Current
(V
OUT = 1.8V, ECO Mode)
30013466
2011 National Semiconductor Corporation
300134
www.national.com
LM3691
High
Accuracy,
Miniature
1A,
Step-Down
DC-DC
Converter
for
Portable
Applications
相关PDF资料 |
PDF描述 |
|---|---|
| LM3691TL-1.0 | 1.7 A SWITCHING REGULATOR, 4400 kHz SWITCHING FREQ-MAX, PBGA6 |
| LM3691TL-1.6 | 1.7 A SWITCHING REGULATOR, 4400 kHz SWITCHING FREQ-MAX, PBGA6 |
| LM3691TLX-1.375 | 1.7 A SWITCHING REGULATOR, 4400 kHz SWITCHING FREQ-MAX, PBGA6 |
| LM3702YABP-308/NOPB | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA9 |
| LM3702XCTP-308/NOPB | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA9 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM36922EVM | 功能描述:LM36922 2, Non-Isolated Output LED Driver Evaluation Board 制造商:texas instruments 系列:- 零件状态:有效 电流 - 输出/通道:- 输出和类型:2，非隔离 电压 - 输出:- 特性:I2C 电压 - 输入:2.5 V ~ 5.5 V 所含物品:板 使用的 IC/零件:LM36922 标准包装:1 |
| LM36923EVM | 功能描述:LM36923 3, Non-Isolated Output LED Driver Evaluation Board 制造商:texas instruments 系列:- 零件状态:有效 电流 - 输出/通道:- 输出和类型:3，非隔离 电压 - 输出:- 特性:I2C 电压 - 输入:2.5 V ~ 5.5 V 所含物品:板 使用的 IC/零件:LM36923 标准包装:1 |
| LM36923HEVM | 功能描述:LM36923H 3, Non-Isolated Output LED Driver Evaluation Board 制造商:texas instruments 系列:- 零件状态:有效 电流 - 输出/通道:- 输出和类型:3，非隔离 电压 - 输出:- 特性:I2C 电压 - 输入:2.5 V ~ 5.5 V 所含物品:板 使用的 IC/零件:LM36923H 标准包装:1 |
| LM36923YFFR | 功能描述:LED 驱动器 IC 3 输出 DC DC 稳压器 升压（升压） I2C，PWM 调光 25mA 12-DSBGA 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:在售 类型:DC DC 稳压器 拓扑:升压（升压） 内部开关:是 输出数:3 电压 - 供电（最低）:2.5V 电压 -?供电（最高）:5.5V 电压 - 输出:28V 电流 - 输出/通道:25mA 频率:500kHz ~ 1MHz 调光:I2C，PWM 应用:背光 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:12-UFBGA，DSBGA 供应商器件封装:12-DSBGA 标准包装:1 |
| LM3697 | 制造商:TI 制造商全称:Texas Instruments 功能描述:High-Efficiency Three-String White LED Driver |
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