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LTC4007-1 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4007-1
Description  4A, High Efficiency, Li-Ion Battery Charger
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4007-1 Datasheet(HTML) 1 Page - Linear Technology

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1
LTC4007-1
40071f
TYPICAL APPLICATIO
APPLICATIO S
DESCRIPTIO
FEATURES
4A, High Efficiency,
Li-Ion Battery Charger
Charger Controller for 3- or 4-Cell
Lithium-Ion Batteries
High Conversion Efficiency: Up to 96%
Output Currents Exceeding 4A
±0.8% Charging Voltage Accuracy
Built-In Charge Termination for Li-Ion Batteries
AC Adapter Current Limiting Maximizes Charge Rate*
Thermistor Input for Temperature Qualified Charging
Wide Input Voltage Range: 6V to 28V
0.5V Dropout Voltage; Maximum Duty Cycle: 98%
Programmable Charge Current:
±4% Accuracy
Indicator Outputs for Charging, C/10 Current
Detection, AC Adapter Present, Low Battery, Input
Current Limiting and Faults
Charging Current Monitor Output
Available in a 24-Pin 4mm
× 5mm QFN Package
Notebook Computers
Portable Instruments
Battery-Backup Systems
Li-Ion Chargers
12.6V, 4A Li-Ion Battery Charger
The LTC
®4007-1 is a constant-current/constant-voltage
charger controller for 3- or 4-cell lithium-ion batteries.
The PWM controller uses a synchronous, quasi-constant
frequency, constant off-time architecture that will not
generate audible noise even when using ceramic capaci-
tors. Charging current is programmable to
±4% accuracy
using a programming resistor. Charging current can also
be monitored as a voltage across the programming
resistor.
The output float voltage is pin programmed for cell count
(3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer,
programmed by an external resistor, sets the total charge
time.
The LTC4007-1 includes a thermistor input, which sus-
pends charging if an unsafe temperature condition is de-
tected. If the cell voltage is less than 3.25V, a low-battery
indicator asserts and can be used to program a trickle charge
current to safely charge depleted batteries. The FAULT pin
is also asserted and charging terminates if the low-battery
condition persists for more than 1/4 of the total charge time.
3C4C
CHEM
LOBAT
ICL
ACP
SHDN
FAULT
CHG
FLAG
NTC
RT
LOBAT
ICL
ACP
SHDN
FAULT
CHG
FLAG
DCIN
INFET
CLP
CLN
TGATE
BGATE
PGND
CSP
BAT
PROG
ITH
GND
LTC4007-1
32.4k
309k
0.47
µF
THERMISTOR
10k
NTC
TIMING RESISTOR
(~2 HOURS)
100k
100k
100k
VLOGIC
DCIN
0V TO 28V
0.1
µF
INPUT SWITCH
15nF
Q1
Q2
20
µF
10
µH
4.99k
3.01k
3.01k
0.025
0.025
20
µF
Li-Ion
BATTERY
CHARGING
CURRENT
MONITOR
Q1: Si4431BDY
Q2: FDC645N
SYSTEM
LOAD
0.12
µF
6.04k
26.7k
0.0047
µF
40071 TA01
PART
AUTO
RESTART
LOW BATTERY
THRESHOLD (Per Cell)
(4.2V/4.1V)
LTC4007-1
NO
3.25V/3.173V
LTC4007
YES
2.5V/2.44V
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
*Protected by U.S. Patents including 5723970.


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