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參數資料
| 型號： | LM261J |
| 英文描述： | Analog Comparator |
| 中文描述： | 模擬比較器 |
| 文件頁數： | 1/19頁 |
| 文件大小： | 2317K |
| 代理商： | LM261J |
LM2612BL/LM2612TL
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
August 2002
L
U
2002 National Semiconductor Corporation
DS200418
www.national.com
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| LM2621 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Input Voltage, Step-Up DC-DC Converter |
| LM2621_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Input Voltage, Step-Up DC-DC Converter |
| LM2621EVAL | 功能描述:EVALUATION BOARD FOR LM2621 RoHS:是 類別:編程器，開發系統 >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2621EVAL/NOPB | 功能描述:電源管理IC開發工具 EVAL BOARDFOR LM2621 RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2621MM | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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