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LT1571EGN-5 Datasheet

  • LT1571EGN-5

  • Constant-Current/ Constant-Voltage Battery Charger with Pres...

  • 205.21KB

  • 16頁(yè)

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Final Electrical Specifications
LT1571 Series
Constant-Current/
Constant-Voltage Battery Charger
with Preset Voltage and Termination Flag
April 2000
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
Fast Charging of Li-Ion, NiMH and NiCd Batteries
Simple Charge Current Programming Requires Only
One Low Cost, 1/32W Resistor
High Efficiency Charger with Up to
1.5A Charge Current
Precision 0.6% Internal Voltage Reference
Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V
500kHz or 200kHz Switching Frequency
Minimizes Charger Size
Low Reverse Battery Drain Current: 5碌A(chǔ)
Flag Indicates Li-Ion Charge Completion
5% Typical Charge Current Accuracy
Low Shutdown Current
LT1571-5: 500kHz, Fixed 4.1V or 4.2V
LT1571-1: 200kHz, Adjustable Voltage
LT1571-2: 200kHz, Fixed 8.2V or 8.4V
The LT
廬
1571 PWM battery charger is a simple, efficient
solution to fast-charge rechargeable batteries including
lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and
nickel-cadmium (NiCd) using constant-current and/or
constant-voltage control. The internal switch is capable
of delivering 1.5A DC current (2A peak current). The
onboard current sense resistor (0.1鈩? allows simple
charge current programming to within 5% accuracy
using a low cost external resistor. The constant-voltage
output can be selected for 4.1V or 4.2V per cell with 0.6%
accuracy.
LT1571 can charge batteries ranging from 1V to 20V. A
saturating switch operating at 200kHz (LT1571-1,
LT1571-2) or 500kHz (LT1571-5) gives high efficiency
and small charger size. A logic output (flag) indicates
Li-Ion near full charge when the charge current drops to
20% of the programmed value. The LT1571-1 and
LT1571-2 are in a 28-pin fused lead narrow SSOP power
package. The LT1571-5 is in a 16-pin fused lead narrow
SSOP power package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
Cellular Phones, PDAs, Notebook Computers,
Portable Instruments
Cradle Chargers for Li-Ion, NiCd, NiMH and
Lead-Acid Rechargeable Batteries
TYPICAL APPLICATIO
V
IN
8.2V
TO 20V
D3
MBRM120T3
V
CC
C
IN
*
10碌F
V
DD
1碌F
100k
6.19k
300鈩?/div>
1k
0.33碌F
V
C
FLAG
BAT
C
OUT
***
22碌F
BAT2
SENSE
CAP
SELECT
GND
LT1571-5
PROG
BOOST
SW
D1
MBRM120T3
C1
0.22碌F
L1**
10碌H
D2
MMBD914L
CHARGE
COMPLETE
4.2V
Li-Ion
BATTERY
+
+
*TOKIN OR MARCON CERAMIC SURFACE MOUNT
**COILTRONICS TP3-100, 10碌H, 2.2mm HEIGHT (0.8A CHARGING CURRENT)
COILTRONICS TP1 SERIES, 10碌H, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)
***PANASONIC EEFCD1B220
Figure 1. Compact Li-Ion Cellular Phone Charger (0.8A)
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
0.1碌F
1571 F01
U
U
1

LT1571EGN-5 產(chǎn)品屬性

  • LT1571 Series

  • 100

  • 集成電路 (IC)

  • PMIC - 電池管理

  • -

  • 充電管理

  • 鉛酸，鋰離子，鎳鎘，鎳氫

  • 8 V ~ 26 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 16-SSOP（0.154"，3.90mm 寬）

  • 16-SSOP

  • 管件

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