Datasheet Texas Instruments BQ24751ARHDT — Ficha de datos

bq24751A
www.ti.com. SLUS756C – SEPTEMBER 2007 – REVISED MARCH 2009 Host-controlled Multi-Chemistry Battery Charger With System Power Selector, AC
Over-Power Protection, Programmable OVP and Low Iq PGND LODRV REGN HIDRV 28 27 26 25 24 23 22 CHGEN 1 21 LEARN ACN 2 20 CELLS ACP 3 bq24751A 19 SRP ACDRV 4 28 LD QFN 18 SRN ACDET 5 TOP VIEW 17 BAT ACSET 6 16 SRSET ACOP 7 15 IADAPT 8 9 10 11 12 13 14 BATDRV The bq24751A charges two, three, or four series Li+
cells, supporting up to 10 A of charge current, and is
available in a 28-pin, 5x5-mm thin QFN package. ACGOOD The bq24751A is a high-efficiency, synchronous
battery charger with integrated compensation and
system power selector logic, offering low component
count for space-constrained multi-chemistry battery
charging applications. Ratiometric charge current and
voltage programming allows very high regulation
accuracies, and can be either hardwired with resistors
or programmed by the system power-management
microcontroller using a DAC or GPIOs. VADJ DESCRIPTION PH Notebook and Ultra-Mobile Computers
Portable Data Capture Terminals
Portable Printers
Medical Diagnostics Equipment
Battery Bay Chargers
Battery Back-up Systems VREF VDAC APPLICATIONS BTST AGND NMOS-NMOS Synchronous Buck Converter
with 300 kHz Frequency and >95% Efficiency
30-ns Minimum Driver Dead-time and 99.5%
Maximum Effective Duty Cycle
High-Accuracy Voltage and Current Regulation
– В±0.5% Charge Voltage Accuracy …