Datasheet LT1571 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Constant-Current/Constant-Voltage Battery Charger with Preset Voltage and Termination Flag |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTIO. Fast Charging of Li-Ion, NiMH and NiCd Batteries. … |
| File Format / Size | PDF / 220 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. Fast Charging of Li-Ion, NiMH and NiCd Batteries. Simple Charge Current Programming Requires
Model Line for this Datasheet
Text Version of Document
LT1571 Series Constant-Current/ Constant-Voltage Battery Chargers with Preset Voltage and Termination Flag
U FEATURES DESCRIPTIO
■
Fast Charging of Li-Ion, NiMH and NiCd Batteries
The LT®1571 PWM battery charger is a simple, efficient ■
Simple Charge Current Programming Requires
solution to fast-charge rechargeable batteries including
Only One Low Cost, 1/32W Resistor
lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and ■
High Efficiency Charger with Up to
nickel-cadmium (NiCd) using constant-current and/or
1.5A Charge Current
constant-voltage control. The internal switch is capable ■
Precision 0.6% Internal Voltage Reference
of delivering 1.5A DC current (2A peak current). The ■
Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V
onboard current sense resistor (0.1Ω) allows simple ■
500kHz or 200kHz Switching Frequency
charge current programming to within 5% accuracy
Minimizes Charger Size
using a low cost external resistor. The constant-voltage ■ Low Reverse Battery Drain Current: 5µA output can be selected for 4.1V or 4.2V per cell with 0.6% ■ Flag Indicates Li-Ion Charge Completion accuracy. ■ 5% Typical Charge Current Accuracy LT1571 can charge batteries ranging from 1V to 20V. A ■ Low Shutdown Current saturating switch operating at 200kHz (LT1571-1, ■ LT1571-1: 200kHz, Adjustable Voltage LT1571-2) or 500kHz (LT1571-5) gives high efficiency LT1571-2: 200kHz, Fixed 8.2V or 8.4V and small charger size. A logic output (flag) indicates LT1571-5: 500kHz, Fixed 4.1V or 4.2V
U
Li-Ion near full charge when the charge current drops to
APPLICATIO S
20% of the programmed value. The LT1571-1 and LT1571-2 are in a 28-pin fused lead narrow SSOP power ■ Cellular Phones, PDAs, Notebook Computers, package. The LT1571-5 is in a 16-pin fused lead narrow Portable Instruments SSOP power package. ■ Cradle Chargers for Li-Ion, NiCd, NiMH and , LTC and LT are registered trademarks of Linear Technology Corporation. Lead-Acid Rechargeable Batteries
U TYPICAL APPLICATION
D3 D1 VIN MBRM120T3 MBRM120T3 8.2V TO 20V VCC SW (ADAPTER C OUTPUT) IN* C1 10µF LT1571-5 0.22µF L1** PROG BOOST 10µH 100k 1µF D2 0.33µF MMBD914L 6.19k 300Ω V SENSE C 1k CAP CHARGE FLAG COMPLETE 0.1µF SELECT BAT 4.2V + + Li-Ion COUT*** BAT2 GND BATTERY 22µF TOKIN OR MARCON CERAMIC SURFACE MOUNT * COILTRONICS TP3-100, 10 ** µH, 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
U FEATURES DESCRIPTIO
■
Fast Charging of Li-Ion, NiMH and NiCd Batteries
The LT®1571 PWM battery charger is a simple, efficient ■
Simple Charge Current Programming Requires
solution to fast-charge rechargeable batteries including
Only One Low Cost, 1/32W Resistor
lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and ■
High Efficiency Charger with Up to
nickel-cadmium (NiCd) using constant-current and/or
1.5A Charge Current
constant-voltage control. The internal switch is capable ■
Precision 0.6% Internal Voltage Reference
of delivering 1.5A DC current (2A peak current). The ■
Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V
onboard current sense resistor (0.1Ω) allows simple ■
500kHz or 200kHz Switching Frequency
charge current programming to within 5% accuracy
Minimizes Charger Size
using a low cost external resistor. The constant-voltage ■ Low Reverse Battery Drain Current: 5µA output can be selected for 4.1V or 4.2V per cell with 0.6% ■ Flag Indicates Li-Ion Charge Completion accuracy. ■ 5% Typical Charge Current Accuracy LT1571 can charge batteries ranging from 1V to 20V. A ■ Low Shutdown Current saturating switch operating at 200kHz (LT1571-1, ■ LT1571-1: 200kHz, Adjustable Voltage LT1571-2) or 500kHz (LT1571-5) gives high efficiency LT1571-2: 200kHz, Fixed 8.2V or 8.4V and small charger size. A logic output (flag) indicates LT1571-5: 500kHz, Fixed 4.1V or 4.2V
U
Li-Ion near full charge when the charge current drops to
APPLICATIO S
20% of the programmed value. The LT1571-1 and LT1571-2 are in a 28-pin fused lead narrow SSOP power ■ Cellular Phones, PDAs, Notebook Computers, package. The LT1571-5 is in a 16-pin fused lead narrow Portable Instruments SSOP power package. ■ Cradle Chargers for Li-Ion, NiCd, NiMH and , LTC and LT are registered trademarks of Linear Technology Corporation. Lead-Acid Rechargeable Batteries
U TYPICAL APPLICATION
D3 D1 VIN MBRM120T3 MBRM120T3 8.2V TO 20V VCC SW (ADAPTER C OUTPUT) IN* C1 10µF LT1571-5 0.22µF L1** PROG BOOST 10µH 100k 1µF D2 0.33µF MMBD914L 6.19k 300Ω V SENSE C 1k CAP CHARGE FLAG COMPLETE 0.1µF SELECT BAT 4.2V + + Li-Ion COUT*** BAT2 GND BATTERY 22µF TOKIN OR MARCON CERAMIC SURFACE MOUNT * COILTRONICS TP3-100, 10 ** µH, 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
