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LT1616ES6 Datasheet

  • LT1616ES6

  • Analog IC

  • 16頁(yè)

  • ETC

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LT1616
600mA, 1.4MHz Step-Down
Switching Regulator
in SOT-23
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Wide Input Range: 3.6V to 25V
5V at 400mA from 7V to 25V Input
3.3V at 400mA from 4.7V to 25V Input
Fixed Frequency 1.4MHz Operation
Uses Tiny Capacitors and Inductors
Internally Compensated
Low Shutdown Current: <1碌A(chǔ)
Low V
CESAT
Switch: 220mV at 300mA
Tiny 6-Lead SOT-23 Package
APPLICATIO S
s
s
The LT
廬
1616 is a current mode PWM step-down DC/DC
converter with internal 0.6A power switch, packaged in a
tiny 6-lead SOT-23. The wide input range of 3.6V to 25V
makes the LT1616 suitable for regulating a wide variety of
power sources, from 4-cell batteries and 5V logic rails to
unregulated wall transformers and lead-acid batteries. Its
high operating frequency allows the use of tiny, low cost
inductors and ceramic capacitors. With its internal com-
pensation eliminating additional components, a complete
400mA step-down regulator fits onto 0.15 square inches
of PC board area.
The constant frequency current mode PWM architecture
and stable operation with ceramic capacitors results in
low, predictable output ripple. Current limiting provides
protection against shorted outputs. The low current (<1碌A(chǔ))
shutdown provides complete output disconnect, enabling
easy power management in battery-powered systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
s
s
Wall Transformer Regulation
Local Logic Supply Conversion:
12V to 5V
12V or 5V to 3.3V, 2.5V or 1.8V
Distributed Supply Regulation
Digital Cameras
Battery-Powered Equipment
TYPICAL APPLICATIO
3.3V Step-Down Converter
V
IN
4.5V TO 25V
5
V
IN
BOOST
LT1616
OFF ON
4
SHDN
GND
2
C1
1碌F
SW
FB
3
R2
10k
6
R1
16.5k
1
D2
C3
0.01碌F
L1
10碌H
100
90
V
OUT
3.3V
300mA: V
IN
= 4.5V TO 25V
400mA: V
IN
= 4.7V TO 25V
C2
10碌F
80
EFFICIENCY (%)
D1
C1: TAIYO-YUDEN TMK316BJ105
C2: TAIYO-YUDEN JMK316BJ106ML
D1: ON SEMICONDUCTOR MBR0530
D2: 1N4148
L1: SUMIDA CR43-100
1616 TA01
U
Efficiency
V
IN
= 5V
V
IN
= 12V
70
60
50
40
30
0
100
300
400
LOAD CURRENT (mA)
200
500
1616 G02
U
U
V
IN
= 20V
1

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