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LTC4020 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4020
Description  55V Buck-Boost Multi-Chemistry Battery Charger
Download  42 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4020 Datasheet(HTML) 1 Page - Linear Technology

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background image
LTC4020
1
4020fb
For more information www.linear.com/LTC4020
VIN (V)
5
100
100
90
80
70
60
50
40
30
20
10
0
95
90
85
80
75
10
15
4020 TA01b
20
30
25
VOUT = 14V
EFFICIENCY
INPUT POWER
P(LOSS)
TYPICAL APPLICATION
FEATURES
DESCRIPTION
55V Buck-Boost
Multi-Chemistry
Battery Charger
The LTC®4020 is a high voltage power manager provid-
ing PowerPath™ instant-on operation and high efficiency
battery charging over a wide voltage range. An onboard
buck-boost DC/DC controller operates with battery and/or
systemvoltagesabove,below,orequaltotheinputvoltage.
The LTC4020 seamlessly manages power distribution
between battery and converter outputs in response to load
variations, battery charge requirements and input power
supply limitations.
TheLTC4020batterychargercanprovideaconstant-current/
constant-voltage charge algorithm (CC/CV), constant-
currentcharging(CC),orchargingwithanoptimized4-step,
3-stagelead-acidbatterychargeprofile. Maximumconverter
and battery charge currents are resistor programmable.
The IC's instant-on operation ensures system load power
even with a fully discharged battery. Additional safety
features include preconditioning for heavily discharged
batteries and an integrated timer for termination and
protection.
APPLICATIONS
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 7583113 and 8405362.
n
Wide Voltage Range: 4.5V to 55V Input, Up to 55V
Output (60V Absolute Maximums)
n
Synchronous Buck-Boost DC/DC Controller
n
Li-Ion and Lead-Acid Charge Algorithms
n
±0.5% Float Voltage Accuracy
n
±5% Charge Current Accuracy
n
Instant-On for Heavily Discharged Batteries
n
Ideal Diode Controller Provides Low Loss
PowerPath When Input Power is Limited
n
Input Voltage Regulation for High Impedance Input
Supplies and Solar Panel Peak Power Operation
n
Onboard Timer for Protection and Termination
n
Bad Battery Detection with Auto-Reset
n
NTC Input for Temperature Qualified Charging
n
Binary Coded Open-Collector Status Pins
n
Low Profile (0.75mm) 38-Pin 5mm × 7mm QFN
Package
n
Portable Industrial and Medical Equipment
n
Solar-Powered Systems
n
Military Communications Equipment
n
12V to 24V Embedded Automotive Systems
Buck-Boost DC/DC Converter Controller with PowerPath Battery Charger Accepts
Inputs from 4.5V to 55V and Produces Output Voltages Up to 55V
5V to 30V 6-Cell Lead-Acid Supply/Charger
Maximum Power Efficiency vs VIN
(Application Circuit on Page 37)
LTC4020
RNTC
RSENSEB
RSENSEA
BUCK-BOOST
DC/DC CONVERTER
PowerPath BATTERY CHARGER
4020 TA01a
VIN
VOUT
RCS


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