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参数资料
| 型号： | LM2631MTC-ADJ/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | TSSOP-20 |
| 文件页数： | 1/12页 |
| 文件大小： | 683K |
| 代理商： | LM2631MTC-ADJ/NOPB |
LM2631
Synchronous Step-Down Power Supply Controller
General Description
The LM2631 controller provides all the active functions for
step-down (buck) switching converters. These dc-to-dc con-
verters provide core CPU power in battery-operated sys-
tems.
High efficiency is achieved by using synchronous rectifica-
tion and pulse-skipping mode operation at light load. Inex-
pensive N-channel MOSFETs are used to reduce system
cost. Bootstrap circuit is used to drive the high-side
N-channel MOSFET.
Current mode control scheme is used to improve line regu-
lation and transient response, also provides cycle-by-cycle
current limiting.
The operating frequency is adjustable between 200 kHz and
400 kHz. An external shutdown pin can be used to disable
the device and reduce the quiescent current to 0.1 A. In low
noise applications, bringing the FPWM pin high can force the
device to operate in constant frequency mode. Other fea-
tures include the external synchronization pin, and the
PGOOD pin to indicate the state of the output voltage.
Protection circuitry includes thermal shutdown, undervoltage
and overvoltage shutdown protection, soft-start capability,
and two levels of current limits: The first level simply limits
the load current directly; at the second level, if the load pulls
the output voltage down below 80% of the regulated value,
the chip will shut down. This operation is disabled during
startup, but an internal timer will enable it if the output does
not come up in the preset time.
Features
n
4.5V to 30V input range
n
Adjustable output (1.5V to 7V)
n
200 kHz to 400 kHz adjustable operating frequency
n
Externally synchronizable
n
On-board power good function
n
Precision 1.24V reference output
n
0.8 mA typical quiescent current
n
0.1 A shutdown current
n
Thermal shutdown
n
Direct current limit protection
n
Input undervoltage lockout
n
Output undervoltage shutdown protection
n
Output overvoltage shutdown protection
n
Programmable soft-start function
n
Tiny TSSOP package
Applications
n
Notebook and subnotebook computers
n
Cellular phones
n
Portable instruments
n
Battery-powered digital devices
Typical Application Circuit
10093701
July 2005
LM2631
Synchronous
Step-Down
Power
Supply
Controller
2005 National Semiconductor Corporation
DS100937
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2633 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs |
| LM2633EVAL | 功能描述:电源管理IC开发工具 EVAL BOARDFOR LM2633 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LM2633MTD | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs |
| LM2633MTD/NOPB | 功能描述:IC REG CTRLR 2-PHS SYNC 48TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| LM2633MTDX/NOPB | 制造商:Texas Instruments 功能描述:5 BIT DAC TRIPLE OUTPUT CONTR |
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