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Linear Technology Electronic Components Datasheet

LT1571 Datasheet

Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag

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LT1571 Series
Constant-Current/
Constant-Voltage Battery Chargers
with Preset Voltage and Termination Flag
FEATURES
s Fast Charging of Li-Ion, NiMH and NiCd Batteries
s Simple Charge Current Programming Requires
Only One Low Cost, 1/32W Resistor
s High Efficiency Charger with Up to
1.5A Charge Current
s Precision 0.6% Internal Voltage Reference
s Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V
s 500kHz or 200kHz Switching Frequency
Minimizes Charger Size
s Low Reverse Battery Drain Current: 5µA
s Flag Indicates Li-Ion Charge Completion
s 5% Typical Charge Current Accuracy
s Low Shutdown Current
s LT1571-1: 200kHz, Adjustable Voltage
LT1571-2: 200kHz, Fixed 8.2V or 8.4V
LT1571-5: 500kHz, Fixed 4.1V or 4.2V
U
APPLICATIO S
s Cellular Phones, PDAs, Notebook Computers,
Portable Instruments
s Cradle Chargers for Li-Ion, NiCd, NiMH and
Lead-Acid Rechargeable Batteries
DESCRIPTIO
The LT®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) 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.
TYPICAL APPLICATION
VIN
8.2V TO 20V
(ADAPTER
OUTPUT)
D3
MBRM120T3
CIN*
10µF
D1
MBRM120T3
VCC SW
LT1571-5
100k
6.19k
CHARGE
COMPLETE
4.2V
Li-Ion
BATTERY
+
1µF
300
PROG
0.33µF
VC
1k
+ COUT***
22µF
FLAG
BAT
BAT2
BOOST
SENSE
CAP
SELECT
GND
C1
0.22µF
D2
MMBD914L
L1**
10µH
0.1µF
*TOKIN OR MARCON CERAMIC SURFACE MOUNT
**COILTRONICS TP3-100, 10µH, 2.2mm HEIGHT (0.8A CHARGING CURRENT)
COILTRONICS TP1 SERIES, 10µH, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)
***PANASONIC EEFCD1B220
1571 F01
Figure 1. Compact Li-Ion Cellular Phone Charger (0.8A)
1


Linear Technology Electronic Components Datasheet

LT1571 Datasheet

Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag

No Preview Available !

LT1571 Series
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (VCC) .............................................. 28V
BOOST Pin Voltage with Respect to VCC ................. 20V
FLAG Pin Voltage ..................................................... VCC
IBAT (Average)........................................................ 1.5A
Switch Current (Peak) .............................................. 2A
Operating Ambient
Temperature Range (Note 2) .................. – 40°C to 85°C
Operating Junction
Temperature Range .............................. – 40°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Storage Temperature Range ................. – 65°C to 150°C
UW U
PACKAGE/ORDER I FOR ATIO
**GND 1
SW 2
BOOST 3
BAT2 4
FLAG 5
SELECT 6
SENSE 7
**GND 8
TOP VIEW
16 GND**
15 VCC1*
14 VCC2*
13 CAP
12 PROG
11 VC
10 BAT
9 GND**
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 75°C/ W
* VCC1 AND VCC2 SHOULD BE CONNECTED
TOGETHER CLOSE TO THE PINS
** FOUR CORNER PINS ARE FUSED TO
INTERNAL DIE ATTACH PADDLE FOR
HEAT SINKING. CONNECT THESE FOUR
PINS TO EXPANDED PC LANDS FOR
PROPER HEAT SINKING
TOP VIEW
**GND 1
**GND 2
**GND 3
SW 4
BOOST 5
NC 6
FLAG 7
NC 8
VFB 9
SENSE 10
**GND 11
**GND 12
**GND 13
**GND 14
28 GND**
27 GND**
26 GND**
25 GND**
24 VCC1*
23 VCC2*
22 CAP
21 PROG
20 VC
19 BAT
18 GND**
17 GND**
16 GND**
15 GND**
GN PACKAGE
28-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 40°C/ W
* VCC1 AND VCC2 SHOULD BE CONNECTED TOGETHER
CLOSE TO THE PINS
** ALL GND PINS ARE FUSED TO INTERNAL DIE ATTACH
PADDLE FOR HEAT SINKING. CONNECT THESE PINS TO
EXPANDED PC LANDS FOR PROPER HEAT SINKING
40°C/W THERMAL RESISTANCE ASSUMES AN INTERNAL
GROUND PLANE DOUBLING AS A HEAT SPREADER
TOP VIEW
**GND 1
**GND 2
**GND 3
SW 4
BOOST 5
BAT2 6
FLAG 7
NC 8
SELECT 9
SENSE 10
**GND 11
**GND 12
**GND 13
**GND 14
28 GND**
27 GND**
26 GND**
25 GND**
24 VCC1*
23 VCC2*
22 CAP
21 PROG
20 VC
19 BAT
18 GND**
17 GND**
16 GND**
15 GND**
GN PACKAGE
28-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 40°C/ W
* VCC1 AND VCC2 SHOULD BE CONNECTED TOGETHER
CLOSE TO THE PINS
** ALL GND PINS ARE FUSED TO INTERNAL DIE ATTACH
PADDLE FOR HEAT SINKING. CONNECT THESE PINS TO
EXPANDED PC LANDS FOR PROPER HEAT SINKING
40°C/W THERMAL RESISTANCE ASSUMES AN INTERNAL
GROUND PLANE DOUBLING AS A HEAT SPREADER
ORDER PART NUMBER
LT1571EGN-5
Consult factory for Industrial and Military grade parts.
ORDER PART NUMBER
LT1571EGN-1
ORDER PART NUMBER
LT1571EGN-2
2


Part Number LT1571
Description Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag
Maker Linear Technology
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LT1571 Datasheet PDF





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