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LTC1612ES8 Datasheet

  • LTC1612ES8

  • Analog IC

  • 193.40KB

  • 12頁

  • ETC

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LT1612
Synchronous, Step-Down
800kHz PWM
DC/DC Converter
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
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
Low Quiescent Current: 160碌A(chǔ)
8-Lead MSOP or SO Package
APPLICATIO S
s
s
s
s
The LT
廬
1612 is an 800kHz, synchronous step-down DC/
DC converter that operates from an input voltage as low
as 2V. Internal 0.45鈩?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 160碌A(chǔ) and shutdown current
is less than 1碌A(chǔ). 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.
Portable Devices
Lithium-Ion Step-Down Converters
5V to 3.3V Conversion
2-Cell Alkaline Step-Down Converters
TYPICAL APPLICATION
0.1碌F
V
IN
2V
V
IN
SHDN
LT1612
C1
10碌F
MODE
V
C
33.2k
330pF
FB
GND
R2
232k
1%
R1
215k
1%
C2
68碌F
3.15V
BOOST
SW
100pF
L1
10碌H
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 鈥?F01b
C1: TAIYO-YUDEN JMK325BJ106MN
C2: PANASONIC EEFCDOF680R
L1: SUMIDA CD43-100
1612 F01a
30
Figure 1. 2V to 1.2V Converter
U
U
U
1

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