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LTC4002ES8-4.2 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4002ES8-4.2
Description  Standalone Li-Ion Switch Mode Battery Charger
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4002ES8-4.2 Datasheet(HTML) 1 Page - Linear Technology

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LTC4002-4.2
1
400242i
s
Portable Computers
s
Charging Docks
s
Handheld Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Wide Input Supply Range: 4.7V to 24V
s
High Efficiency Current Mode PWM Controller with
500kHz Switching Frequency
s
±1% Charge Voltage Accuracy
s
End-of-Charge Current Detection Output
s
3 Hour Charge Termination Timer
s
Constant Switching Frequency for Minimum Noise
s
±5% Charge Current Accuracy
s
Low 10
µA Reverse Battery Drain Current
s
Automatic Battery Recharge
s
Automatic Shutdown When Input Supply is Removed
s
Automatic Trickle Charging of Low Voltage Batteries
s
Battery Temperature Sensing and Charge
Qualification
s
Stable with Ceramic Output Capacitor
s
8-Lead SO and 10-Lead DFN Packages
Standalone Li-Ion
Switch Mode Battery Charger
June 2003
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
The LTC
®4002-4.2 is a complete battery charger controller
for single cell 4.2V lithium-ion batteries. With a 500kHz
switching frequency, the LTC4002-4.2 provides a small,
simple and efficient solution to fast charge Li-Ion batteries
from a wide range of supply voltages. An external sense
resistor sets the charge current with
±5% accuracy. An
internal resistor divider and precision reference set the
final float voltage to 4.2V with
±1% accuracy.
When the input supply is removed, the LTC4002-4.2
automatically enters a low current sleep mode, dropping
the battery drain current to 10
µA. An internal comparator
detects the near end-of-charge condition while an internal
timer sets the total charge time and terminates the charge
cycle. After the charge cycle ends, if the battery voltage
drops below 4.05V, a new charge cycle will automatically
begin.
The LTC4002-4.2 is available in the 8-lead SO and 10-lead
DFN packages.
L1
6.8
µH
Si6435ADQ
2
3
7
6
1
5
4
8
B330B-13
B330B-13
22
µF
CER
+
400242 F01
NTC: DALE NTHS-1206N02
10
µF
CER
0.1
µF
CER
0.47
µF
2.2k
68m
Li-Ion
BATTERY
10k
NTC
SENSE
GATE
BAT
CHRG
LTC4002ES8-4.2
VCC
VIN
5V TO 24V
BAT
NTC
GND
COMP
2k
CHARGE
STATUS
T
Figure 1. 1.5A Single Cell Li-Ion Battery Charger
INPUT VOLTAGE (V)
5
80
VBAT = 4V
90
25
400242 TA02
70
60
10
15
20
100
VBAT = 3.8V
ICHRG = 1.5A
RSENSE = 68mΩ
(CURVES INCLUDE
INPUT DIODE)
Efficiency vs Input Voltage


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