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LT1959IR

Description
Conv DC-DC 4V to 16V Synchronous Step Down Single-Out 1.21V to 2.42V 8.5A 8-Pin(7+Tab) DDPAK
CategoryPower/power management    The power supply circuit   
File Size293KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LT1959IR Overview

Conv DC-DC 4V to 16V Synchronous Step Down Single-Out 1.21V to 2.42V 8.5A 8-Pin(7+Tab) DDPAK

LT1959IR Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
HTS8542.39.00.01
SVHCYes
SVHC Exceeds ThresholdYes
TypeSynchronous Step Down
Process TechnologyBipolar
Output TypeAdjustable
Switching Frequency (kHz)540
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)1.21 to 2.42
Maximum Output Current (A)8.5
Minimum Input Voltage (V)4
Maximum Input Voltage (V)16
Operating Supply Voltage (V)4 to 16
Typical Quiescent Current (uA)3800
Line Regulation0.03%/V
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeIndustrial
Pin Count8
Standard Package NameTO-263
Supplier PackageDDPAK
MountingSurface Mount
Package Height4.57(Max)
Package Length10.54(Max)
Package Width9.4(Max)
PCB changed7
TabTab
Lead ShapeGull-wing
LT1959
4.5A, 500kHz Step-Down
Switching Regulator
FEATURES
s
s
s
s
s
s
s
s
s
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
µ
H
Saturating Switch Design: 0.07Ω
Shutdown Current: 15µA
Easily Synchronizable
Cycle-by-Cycle Current Limiting
4.5A Switch
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 15µA. 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
0.68µF
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
5µH
90
C3
10µF TO
50µF
CERAMIC
+
OPEN
OR
HIGH
= ON
OUTPUT
1.8V
4A
EFFICIENCY (%)
80
+
C1
100µF, 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 = 10µH
1959 TA02
U
U
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