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LT1959I Datasheet

  • LT1959I

  • 4.5A, 500kHz Step-Down Switching Regulator

  • 24頁(yè)

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LT1959
4.5A, 500kHz Step-Down
Switching Regulator
FEATURES
s
s
s
s
s
s
s
s
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s
s
DESCRIPTIO
Operates with Input as Low as 4V
Output Range Down to 1.21V
Constant 500kHz Switching Frequency
Uses All Surface Mount Components
Inductor Size Reduced to 1.8
碌
H
Saturating Switch Design: 0.07鈩?/div>
Shutdown Current: 20碌A(chǔ)
Easily Synchronizable
Cycle-by-Cycle Current Limiting
4.5A Switch
Current Mode Control
The LT
廬
1959 is a 500kHz monolithic buck mode switching
regulator functionally identical to the LT1506 but optimized
for lower output voltage applications. It will operate down
to 1.21V output compared to 2.42V for the LT1506. A 4.5A
switch is included on the die along with all the necessary
oscillator, control and logic circuitry. High switching fre-
quency allows a considerable reduction in the size of ex-
ternal components. The topology is current mode for fast
transient response and good loop stability.
A special high speed bipolar process and new design tech-
niques achieve high efficiency at high switching frequency.
Efficiency is maintained over a wide output current range
by keeping quiescent supply current to 4mA and by utiliz-
ing a supply boost capacitor to saturate the power switch.
The LT1959 fits into standard 7-pin DD and fused lead
SO-8 packages. Full cycle-by-cycle short-circuit protection
and thermal shutdown are provided. Standard surface
mount external parts are used, including the inductor and
capacitors. There is the optional function of shutdown or
synchronization. A shutdown signal reduces supply current
to 20碌A(chǔ). Synchronization allows an external logic level sig-
nal to increase the internal oscillator from 580kHz to 1MHz.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
s
Portable Computers
Battery-Powered Systems
Battery Chargers
Distributed Power
5V to 3.3V Conversion
5V to 2.5V Conversion
5V to 1.8V Conversion
TYPICAL APPLICATION
5V to 1.8V Down Converter
D2
1N914
C2
0.68碌F
INPUT
5V
BOOST
V
IN
V
SW
LT1959
SHDN
GND
FB
V
C
C
C
1.5nF
D1
MBRS330T3
R2
2.49k
R1
1.21k
85
L1
5碌H
90
C3
10碌F TO
50碌F
CERAMIC
+
OPEN
OR
HIGH
= ON
OUTPUT
1.8V
4A
EFFICIENCY (%)
80
+
C1
100碌F, 10V
SOLID
TANTALUM
1959 TA01
75
70
0
0.5
1.0
1.5 2.0 2.5 3.0
LOAD CURRENT (A)
3.5
4.0
U
Efficiency vs Load Current
V
OUT
= 3.3V
V
IN
= 5V
L = 10碌H
1959 TA02
U
U
1

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