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LTC1769

Description
high effi ciency multi-chemistry battery charger with powerpath control
File Size300KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LTC1769 Overview

high effi ciency multi-chemistry battery charger with powerpath control

FEATURES
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LTC4012-3
High Efficiency,
Multi-Chemistry Battery Charger
with PowerPath Control
DESCRIPTION
The LTC4012-3 is a constant-current/constant-voltage
battery charger controller. It uses a synchronous quasi-
constant frequency PWM control architecture that will not
generate audible noise with ceramic bulk capacitors. Charge
current is set by external resistors and can be monitored
as an output voltage across the programming resistor.
With no built-in termination, the LTC4012-3 charges a
wide range of batteries under external control.
The LTC4012-3 features fully adjustable output voltage. For
charge management and safety, the IC includes an input
P-channel MOSFET ideal diode controller, battery (output)
overvoltage protection, reverse charge current protection,
PWM soft-start and robust non-overlap control for an all
N-channel MOSFET PWM power stage.
The device includes AC adapter input current limiting, which
maximizes the charge rate for a fixed input power level. An
external sense resistor programs the input current limit,
and the
ICL
status pin indicates reduced charge current as
a result of AC adapter current limiting. Ideal diode control
at the adaptor input improves charger efficiency.
The
CHRG
status pin is active during all charging modes,
including special indication for low charge current.
General Purpose Battery Charger Controller
Efficient 550kHz Synchronous Buck PWM Topology
±0.5% Output Float Voltage Accuracy
Programmable Charge Current: 4% Accuracy
Programmable AC Adapter Current Limit:
3% Accuracy
No Audible Noise with Ceramic Capacitors
INFET Low Loss Ideal Diode PowerPath™ Control
Wide Input Voltage Range: 6V to 28V
Wide Output Voltage Range: 2V to 28V
Indicator Outputs for Charging, C/10 Current
Detection and Input Current Limiting
Analog Charge Current Monitor
Micropower Shutdown
20-Pin 4mm
×
4mm
×
0.75mm QFN Package
APPLICATIONS
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Notebook Computers
Portable Instruments
Battery Backup Systems
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5723970.
TYPICAL APPLICATION
FROM
ADAPTER
13V TO 20V
INFET
DCIN
0.1μF
CLP
CLN
BOOST
TGATE
SW
INTV
DD
BGATE
GND
3.01k
ITH
6.04k
0.1μF
CSP
25mΩ
0.1μF
5.1k
20μF
POWER TO
SYSTEM
Efficiency at DCIN = 20V
100
95
EFFICIENCY (%)
EFFICIENCY
POWER LOSS (mW)
10000
0.1μF
90
85
80
75
70
V
OUT
= 12.3V
R
SENSE
= 33mΩ
R
IN
= 3.01k
R
PROG
= 26.7k
0
0.5
1
1.5
2
CHARGE CURRENT (A)
PIN J NAME
ACP
X
4012-3 TA02
POWER LOSS
1000
CHRG
TO/FROM
MCU
ICL
SHDN
2μF
6.8μH
LTC4012-3
CSN
PROG
BAT
FBDIV
33mΩ
3.01k
2.5
3
100
20μF
301k
26.7k
4.7nF
+
V
FB
32.8k
12.3V
Li-Ion
BATTERY
4012-3 TA01
PART
GND
LTC4012
LTC4012-3
X
40123f
1

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Description high effi ciency multi-chemistry battery charger with powerpath control high effi ciency multi-chemistry battery charger with powerpath control high effi ciency multi-chemistry battery charger with powerpath control high effi ciency multi-chemistry battery charger with powerpath control
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