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LTC1872ES6 Datasheet

  • LTC1872ES6

  • Constant Frequency Current Mode Step-Up DC/DC Controller in ...

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LTC1872
Constant Frequency
Current Mode Step-Up
DC/DC Controller in SOT-23
FEATURES
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
High Efficiency: Over 90%
High Output Currents Easily Achieved
Wide V
IN
Range: 2.5V to 9.8V
V
OUT
Limited Only by External Components
Constant Frequency 550kHz Operation
Burst Mode
TM
Operation at Light Load
Current Mode Operation for Excellent Line and Load
Transient Response
Low Quiescent Current: 270碌A(chǔ)
Shutdown Mode Draws Only 8碌A(chǔ) Supply Current
鹵2.5%
Reference Accuracy
Tiny 6-Lead SOT-23 Package
The LTC
廬
1872 is a constant frequency current mode step-
up DC/DC controller providing excellent AC and DC load
and line regulation. The device incorporates an accurate
undervoltage lockout feature that shuts down the LTC1872
when the input voltage falls below 2.0V.
The LTC1872 boasts a
鹵2.5%
output voltage accuracy and
consumes only 270碌A(chǔ) of quiescent current. For applica-
tions where efficiency is a prime consideration, the LTC1872
is configured for Burst Mode operation, which enhances
efficiency at low output current.
In shutdown, the device draws a mere 8碌A(chǔ). The high
550kHz constant operating frequency allows the use of a
small external inductor.
The LTC1872 is available in a small footprint 6-lead
SOT-23.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Lithium-Ion-Powered Applications
Cellular Telephones
Wireless Modems
Portable Computers
Scanners
TYPICAL APPLICATION
R1
0.03鈩?/div>
147k
220pF
80.6k
1
I
TH
/RUN
LTC1872
2
3
GND
V
FB
SENSE
鈥?/div>
NGATE
422k
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: MURATA GRM42-2X5R226K6.3
D1: IR10BQ015
L1: MURATA LQN6C4R7M04
M1: IRLMS2002
R1: DALE 0.25W
4
6
M1
D1
V
IN
5
L1
4.7碌H
C1
10碌F
10V
V
IN
3.3V
100
95
V
OUT
5V
1A
90
EFFICIENCY (%)
+
C2
2脳 22碌F
6.3V
85
80
75
70
65
1872 TA01
Figure 1. LTC1872 High Output Current 3.3V to 5V Boost Converter
U
Efficiency vs Load Current
V
IN
= 3.3V
V
OUT
= 5V
1
10
100
LOAD CURRENT (mA)
1000
1872 TA01b
U
U
1

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