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參數(shù)資料
| 型號(hào)： | LM2770 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode |
| 中文描述： | 高效率開關(guān)電容降壓DC / DC變換器與睡眠模式穩(wěn)壓器 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 796K |
| 代理商： | LM2770 |
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
55μA 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
L
2004 National Semiconductor Corporation
DS201260
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2770A-AABZ WAF | 制造商:Texas Instruments 功能描述: |
| LM2770SD-1215 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2770SD-1215/NOPB | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2770SD-12157 | 制造商:Texas Instruments 功能描述:CONVERTER DC-DC STEP DOWN LLP-10 |
| LM2770SD-12157/NOPB | 功能描述:IC REG BUCK SWITCHED CAP 10-LLP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
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