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LTC1612

Description
Synchronous, Step-Down 800kHz PWM DC/DC Converter
File Size180KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTC1612 Overview

Synchronous, Step-Down 800kHz PWM DC/DC Converter

Final Electrical Specifications
LT1612
Synchronous, Step-Down
800kHz PWM
DC/DC Converter
April 2000
FEATURES
s
s
s
s
s
s
DESCRIPTION
The LT
®
1612 is an 800kHz, synchronous step-down DC/
DC converter that operates from an input voltage as low
as 2V. Internal 0.45Ω switches deliver output currents up
to 500mA, and the 800kHz switching frequency allows the
use of small, low value ceramic input and output capaci-
tors. Input voltage ranges from 5.5V down to 2V and
output voltage can be set as low as the 620mV reference.
The device features Burst Mode
TM
operation, keeping
efficiency high at light loads. Burst Mode operation can be
defeated by pulling the MODE pin high, enabling constant
switching throughout the load range for low noise.
No-load quiescent current is 160µA and shutdown current
is less than 1µA. The device is available in 8-lead SO and
MSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
Operates from Input Voltage As Low As 2V
Internal 0.7A Synchronous Switches
Uses Ceramic Input and Output Capacitors
620mV Reference Voltage
800kHz Fixed Frequency Switching
Programmable Burst Mode Operation
APPLICATIONS
s
s
s
s
Portable Devices
Lithium-Ion Step-Down Converters
5V to 3.3V Conversion
2-Cell Alkaline Step-Down Converters
TYPICAL APPLICATION
0.1µF
V
IN
2V
V
IN
SHDN
LT1612
C1
10µF
MODE
V
C
33k
330pF
FB
GND
R2
232k
1%
R1
215k
1%
C2
68µF
3.15V
BOOST
SW
100pF
L1
10µH
V
OUT
1.2V
500mA
Efficiency for LT1612 vs Linear Regulator
V
OUT
= 1.2V
90
80
V
IN
= 2V
V
IN
= 3V
V
IN
= 2V (LINEAR)
EFFICIENCY (%)
70
60
50
40
V
IN
= 3V (LINEAR)
10
100
LOAD CURRENT (mA)
500
1612 • F01b
C1: TAIYO-YUDEN JMK325BJ106MN
C2: PANASONIC EEFCDOF680R
L1: SUMIDA CD43-100
1612 F01a
30
Figure 1. 2V to 1.2V Converter
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
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