Datasheet

LTC4020
1
4020fd
For more information www.linear.com/LTC4020
V
IN
(V)
5
EFFICIENCY (%)
POWER (W)
100 100
90
80
70
60
50
40
30
20
10
0
95
90
85
80
75
10 15
4020 TA01b
20 3025
V
OUT
= 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
system voltages above, below, or equal to the input voltage.
The LTC4020 seamlessly manages power distribution
between battery and converter outputs in response to load
variations, battery charge requirements and input power
supply limitations.
The LTC4020 battery charger can provide a constant-current/
constant-voltage charge algorithm (CC/CV), constant-
current charging (CC), or charging with an optimized 4-step,
3-stage lead-acid battery charge profile. Maximum converter
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 , LT C , LT M, 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 V
IN
(Application Circuit on Page 37)
LTC4020
R
NTC
R
SENSEB
R
SENSEA
BUCK-BOOST
DC/DC CONVERTER PowerPath BATTERY CHARGER
4020 TA01a
V
IN
V
OUT
R
CS
BG1
TG1
SENSBOT
SENSTOP
SENSVIN
BG2
TG2
V
FBMAX
CSP
CSN
BGATE
VFB
NTC
SENSGND
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