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| 型号： | LM3691TLX-0.9 |
| 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-0.9 |
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3691TLX-1.0 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications |
| LM3691TLX-1.0/NOPB | 功能描述:直流/直流开关转换器 Hi Acc Mini 1A SD DC-DC Cnvtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM3691TLX-1.1 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications |
| LM3691TLX-1.2 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications |
| LM3691TLX-1.2/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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