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LTC4002EDD-4.2 Datasheet

  • LTC4002EDD-4.2

  • Standalone Li-Ion Switch Mode Battery Charger

  • 16頁(yè)

  • LINER

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Final Electrical Specifications
LTC4002-4.2
Standalone Li-Ion
Switch Mode Battery Charger
June 2003
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
Wide Input Supply Range: 4.7V to 24V
High Efficiency Current Mode PWM Controller with
500kHz Switching Frequency
鹵1%
Charge Voltage Accuracy
End-of-Charge Current Detection Output
3 Hour Charge Termination Timer
Constant Switching Frequency for Minimum Noise
鹵5%
Charge Current Accuracy
Low 10碌A(chǔ) Reverse Battery Drain Current
Automatic Battery Recharge
Automatic Shutdown When Input Supply is Removed
Automatic Trickle Charging of Low Voltage Batteries
Battery Temperature Sensing and Charge
Qualification
Stable with Ceramic Output Capacitor
8-Lead SO and 10-Lead DFN Packages
The LTC
廬
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
鹵5%
accuracy. An
internal resistor divider and precision reference set the
final float voltage to 4.2V with
鹵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碌A(chǔ). 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Portable Computers
Charging Docks
Handheld Instruments
TYPICAL APPLICATIO
V
IN
5V TO 24V
B330B-13
0.1碌F
CER
2
V
CC
GATE
2k
LTC4002ES8-4.2
CHARGE
STATUS
5
7
3
Si6435ADQ
B330B-13
90
BAT
10碌F
CER
100
I
CHRG
= 1.5A
R
SENSE
= 68m鈩?/div>
(CURVES INCLUDE
INPUT DIODE)
V
BAT
= 4V
CHRG
SENSE
EFFICIENCY (%)
L1
6.8碌H
68m鈩?/div>
80
1
0.47碌F
2.2k
COMP
NTC
8
T
BAT
GND
4
10k
NTC
6
22碌F
CER
+
Li-Ion
BATTERY
400242 F01
70
NTC: DALE NTHS-1206N02
60
5
Figure 1. 1.5A Single Cell Li-Ion Battery Charger
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.
U
Efficiency vs Input Voltage
V
BAT
= 3.8V
10
15
INPUT VOLTAGE (V)
400242 TA02
U
U
20
25
400242i
1

LTC4002EDD-4.2 產(chǎn)品屬性

  • LTC4002

  • 121

  • 集成電路 (IC)

  • PMIC - 電池管理

  • -

  • 充電管理

  • 鋰離子（Li-Ion）

  • 4.7 V ~ 22 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 10-WFDFN 裸露焊盤(pán)

  • 10-DFN（3x3）

  • 管件

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