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参数资料
| 型号： | LM2630MTC-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： | 681K |
| 代理商： | LM2630MTC-ADJ/NOPB |
LM2630
Synchronous Step-Down Power Supply Controller
General Description
The LM2630 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
shut down, 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 willshut down.
This latched 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 (1.8V to 6V)
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
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
10012001
July 2005
LM2630
Synchronous
Step-Down
Power
Supply
Controller
2005 National Semiconductor Corporation
DS100120
www.national.com
相关PDF资料 |
PDF描述 |
|---|---|
| LM2630MTC-ADJX | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| LM2631MTCX-ADJ/NOPB | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| LM2636MWC | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, UUC |
| LM2636MX/NOPB | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| LM2636MTCX/NOPB | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2630MTCX-ADJ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM2630MTCX-ADJ/NOPB | 制造商:Texas Instruments 功能描述:DC DC Cntrlr Single-OUT Step Down 4.5V to 30V Input 20-Pin TSSOP T/R |
| LM2631 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Synchronous Step-Down Power Supply Controller |
| LM2631MTC-ADJ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Mode SMPS Controller |
| 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 |
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