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參數(shù)資料
| 型號： | LM2630MTC-ADJX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 373K |
| 代理商： | LM2630MTC-ADJX |
LM2630
OBSOLETE
August 25, 2011
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 systems.
High efficiency is achieved by using synchronous rectification
and pulse-skipping mode operation at light load. Inexpensive
N-channel MOSFETs are used to reduce system cost. Boot-
strap circuit is used to drive the high-side N-channel MOS-
FET.
Current mode control scheme is used to improve line regula-
tion and transient response, also provides cycle-by-cycle cur-
rent 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 features
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 lim-
its: 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
■ 4.5V to 30V input range
■ Adjustable output (1.8V to 6V)
■ 200 kHz to 400 kHz adjustable operating frequency
■ Externally synchronizable
■ On-board power good function
■ Precision 1.24V reference output
■ 0.8 mA typical quiescent current
■ 0.1 A shutdown current
■ Thermal shutdown
■ Direct current limit protection
■ Input undervoltage lockout
■ Output Undervoltage shutdown protection
■ Programmable soft-start function
■ Tiny TSSOP package
Applications
■ Notebook and subnotebook computers
■ Cellular phones
■ Portable instruments
■ Battery-powered digital devices
Typical Application Circuit
10012001
2011 National Semiconductor Corporation
100120
www.national.com
100120 Version 9 Revision 2
Print Date/Time: 2011/08/25 17:11:52
LM2630
Synchronous
Step-Down
Power
Supply
Controller
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相關代理商/技術參數(shù) |
參數(shù)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 制造商全稱:National Semiconductor 功能描述:Synchronous Step-Down Power Supply Controller |
| LM2631MTC-ADJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
| LM2633 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs |
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