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LM2630 Datasheet

  • LM2630

  • Synchronous Step-Down Power Supply Controller

  • 15頁

  • NSC

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LM2630 Synchronous Step-Down Power Supply Controller
February 1999
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 regula-
tion 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 碌A(chǔ). 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 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 pre-
set time.
Features
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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 碌A(chǔ) shutdown current
Thermal shutdown
Direct current limit protection
Input undervoltage lockout
Output Undervoltage shutdown protection
Programmable soft-start function
Tiny TSSOP package
Applications
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Notebook and subnotebook computers
Cellular phones
Portable instruments
Battery-powered digital devices
Typical Application Circuit
DS100120-1
漏 1999 National Semiconductor Corporation
DS100120
www.national.com

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