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LM2677 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2677
Description  SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator with Sync
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2677 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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SIMPLE SWITCHER® High Efficiency 5A Step-Down
Voltage Regulator with Sync
General Description
The LM2677 series of regulators are monolithic integrated
circuits which provide all of the active functions for a step-
down (buck) switching regulator capable of driving up to 5A
loads with excellent line and load regulation characteristics.
High efficiency (>90%) is obtained through the use of a low
ON-resistance DMOS power switch. The series consists of
fixed output voltages of 3.3V, 5V and 12V and an adjustable
output version.
The SIMPLE SWITCHER concept provides for a complete
design using a minimum number of external components.
The switching clock frequency can be provided by an inter-
nal fixed frequency oscillator (260KHz) or from an externally
provided clock in the range of 280KHz to 400Khz which
allows the use of physically smaller sized components. A
family of standard inductors for use with the LM2677 are
available from several manufacturers to greatly simplify the
design process. The external Sync clock provides direct and
precise control of the output ripple frequency for consistent
filtering or frequency spectrum positioning.
The LM2677 series also has built in thermal shutdown,
current limiting and an ON/OFF control input that can power
down the regulator to a low 50µA quiescent current standby
condition. The output voltage is guaranteed to a ±2% toler-
Efficiency up to 92%
Simple and easy to design with (using off-the-shelf
external components)
100 m
Ω DMOS output switch
3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
50µA standby current when switched OFF
n ±
2%maximum output tolerance over full line and load
Wide input voltage range: 8V to 40V
External Sync clock capability (280KHz to 400KHz)
260 KHz fixed frequency internal oscillator
−40 to +125˚C operating junction temperature range
Simple to design, high efficiency (>90%) step-down
switching regulators
Efficient system pre-regulator for linear voltage
Battery chargers
Communications and radio equipment regulator with
synchronized clock frequency
Typical Application
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.
April 2005
© 2005 National Semiconductor Corporation

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