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參數(shù)資料
| 型號： | LM2612BL |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits |
| 中文描述： | 400mA的超小型，可編程，降壓型DC - DC轉(zhuǎn)換器，用于超低電壓電路 |
| 文件頁數(shù)： | 1/19頁 |
| 文件大?。?/td> | 2318K |
| 代理商： | LM2612BL |
LM2612BL
400mA Sub-miniature, Programmable, Step-Down DC-DC
Converter for Ultra Low-Voltage Circuits
General Description
The LM2612 step-down DC-DC converter is optimized for
powering ultra-low voltage circuits from a single Lithium-Ion
cell. It provides up to 400mA (300mA for B grade), over an
input voltage range of 2.8V to 5.5V. Pin programmable out-
put voltages of 1.05V, 1.3V, 1.5V or 1.8V allow adjustment
for MPU voltage options without board redesign or external
feedback resistors.
The device has three pin-selectable modes for maximizing
battery life in mobile phones and similar portable applica-
tions. Low-noise PWM mode offers 600kHz fixed-frequency
operation to reduce interference in RF and data acquisition
applications during full-power operation. In PWM mode, in-
ternal synchronous rectification provides high efficiency
(91% typ. at 1.8V
). A SYNC input allows synchronizing
the switching frequency in a range of 500kHz to 1MHz to
avoid noise from intermodulation with system frequencies.
Low-current hysteretic PFM mode reduces quiescent current
to 160 μA (typ.) during system standby. Shutdown mode
turns the device off and reduces battery consumption to
0.02μA (typ.). Additional features include soft start and cur-
rent overload protection.
The LM2612 is available in a 10 pin micro SMD packge. This
package uses National’s wafer level chip-scale micro SMD
technology and offers the smallest possible size. Only three
small external surface-mount components, an inductor and
two ceramic capacitors are required.
Key Specifications
n
Operates from a single LiION cell (2.8V to 5.5V)
n
Internal synchronous rectification for high PWM mode
efficiency
n
Pin programmable output voltage (1.05V, 1.3V, 1.5V and
1.8V)
n
400mA maximum load capability (300mA for B grade)
n
±
2% PWM mode DC output voltage precision
n
5mV typ PWM mode output voltage ripple
n
160 μA typ PFM mode quiescent current
n
0.02μA typ shutdown mode current
n
600kHz PWM mode switching frequency
n
SYNC input for PWM mode frequency synchronization
from 500kHz to 1MHz
Features
n
Sub-miniature 10-pin micro SMD package
n
Only three tiny surface-mount external components
required
n
Uses small ceramic capacitors
n
Internal soft start
n
Current overload protection
n
No external compensation required
n
Thermal shutdown protection
Applications
n
Mobile Phones
n
Hand-Held Radios
n
Battery Powered Devices
Typical Application Circuit
20041802
December 2002
L
L
2002 National Semiconductor Corporation
DS200418
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2612BTL | 功能描述:IC REG BUCK SYNC ADJ 10-USMD RoHS:否 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 |
| LM2612BTL/NOPB | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 2.8V to 5.5V 10-Pin uSMD |
| LM2612BTLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits |
| LM2612TL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM2614 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:400mA Sub-Miniature Adjustable DC-DC Converter Optimized for RF Power Amplifiers |
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