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参数资料
| 型号： | LM2770SD-12157/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 925 kHz SWITCHING FREQ-MAX, DSO10 |
| 封装： | 3 X 3 MM, 0.80 MM HEIGHT, LEAD FREE, PLL-10 |
| 文件页数： | 1/14页 |
| 文件大小： | 796K |
| 代理商： | LM2770SD-12157/NOPB |
LM2770
High Efficiency Switched Capacitor Step-Down DC/DC
Regulator with Sleep Mode
General Description
The LM2770 is a switched capacitor step-down regulator
that is ideal for powering low-voltage applications in portable
systems. The LM2770 can supply load currents up to 250mA
and operates over an input voltage range of 2.7V to 5.5V.
This makes the LM2770 a great choice for systems powered
by 1-cell Li-Ion batteries and chargers. The output voltage of
the LM2770 can be dynamically switched between two out-
put levels with a logic input pin. Output voltage pairs cur-
rently available include 1.2V/1.5V and 1.2V/1.575V. Other
pairs of voltage options can be developed upon request.
LM2770 efficiency is superior to both fixed-gain switched
capacitor buck regulators and low-dropout linear regulators
(LDO’s). Multiple fractional gains maximize power efficiency
over the entire input voltage and output current ranges. The
LM2770 can also be switched into a low-power sleep mode
when load currents are light (
≤ 20mA). In sleep mode, the
charge pump is off, and the output is driven with a low-noise,
low-power linear regulator.
Soft-start, short-circuit protection, current-limit protection,
and thermal-shutdown protection are also included. The
LM2770 is available in National’s small 10-pin Leadless
Leadframe Package (LLP-10).
Features
n
High Efficiency Multi-Gain Architecture: Peak Power
Efficiency >85%
n
Output Voltage Pairs: 1.2V/1.5V and 1.2V/1.575V
n
Dynamic Output Voltage Selection
n
±3% Output Voltage Accuracy
n
Output Currents up to 250mA
n
2.7V to 5.5V Input Range
n
Low-Supply-Current Sleep Mode
n
55A Quiescent Supply Current in Full-Power Mode
n
Soft-Start
n
Short-Circuit Protection in Full-Power Mode
n
Current-Limit Protection in Sleep Mode
n
LLP-10 Package (3mm x 3mm x 0.8mm)
Applications
n
DSP Power Supplies
n
Baseband Power Supplies
n
Mobile Phones and Pagers
n
Portable Electronic Equipment
Typical Application Circuit
20126001
LM2770 Efficiency vs.
Low-Dropout Linear Regulator (LDO) Efficiency
20126011
December 2004
LM2770
High
Efficiency
Switched
Capacitor
Step-Down
DC/DC
Regulator
with
Sleep
Mode
2004 National Semiconductor Corporation
DS201260
www.national.com
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| LM2770SDX-1215/NOPB | SWITCHED CAPACITOR REGULATOR, 925 kHz SWITCHING FREQ-MAX, DSO10 |
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| LM2788MM-1.5/NOPB | SWITCHED CAPACITOR REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2770SDX-1215 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode |
| LM2770SDX-1215/NOPB | 功能描述:IC REG BUCK SWITCHED CAP 10LLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| LM2770SDX-12157 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode |
| LM2770SDX-12157/NOPB | 功能描述:IC REG BUCK SWITCHED CAP 10LLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| LM2771 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter |
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