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LT1959 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT1959
Description  4.5A, 500kHz Step-Down Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1959 Datasheet(HTML) 1 Page - Linear Technology

 
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1
LT1959
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATION
4.5A, 500kHz Step-Down
Switching Regulator
s
Operates with Input as Low as 4V
s
Output Range Down to 1.21V
s
Constant 500kHz Switching Frequency
s
Uses All Surface Mount Components
s
Inductor Size Reduced to 1.8
µH
s
Saturating Switch Design: 0.07
s
Shutdown Current: 15
µA
s
Easily Synchronizable
s
Cycle-by-Cycle Current Limiting
s
4.5A Switch
s
Current Mode Control
The LT
®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 3.8mA and by uti-
lizing 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 15
µA.Synchronizationallowsanexternallogiclevelsig-
nal to increase the internal oscillator from 580kHz to 1MHz.
s
Portable Computers
s
Battery-Powered Systems
s
Battery Chargers
s
Distributed Power
s
5V to 3.3V Conversion
s
5V to 2.5V Conversion
s
5V to 1.8V Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
Efficiency vs Load Current
5V to 1.8V Down Converter
BOOST
LT1959
VIN
OUTPUT
1.8V
4A
INPUT
5V
1959 TA01
C2
0.68
µF
CC
1.5nF
D1
MBRS330T3
C1
100
µF, 10V
SOLID
TANTALUM
C3
10
µF TO
50
µF
CERAMIC
D2
1N914
L1
5
µH
VSW
FB
SHDN
OPEN
OR
HIGH
= ON
GND
VC
+
+
R2
2.49k
R1
1.21k
LOAD CURRENT (A)
0
90
85
80
75
70
2.0
2.5
3.0
3.5
1959 TA02
0.5
1.0
1.5
4.0
VOUT = 3.3V
VIN = 5V
L = 10
µH


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