Datasheet Texas Instruments BQ24751B — Datenblatt

Not Recommended For New Designs bq24751B
www.ti.com . SLUS835A – JULY 2008 – REVISED MARCH 2009 Host-Controlled Multi-Chemistry Battery Charger with Low Iq and System Power Selector
– < 10 µA Off-State Battery Discharge Current
– < 1.5 mA Off-State Input Quiescent Current FEATURES 1 APPLICATIONS Notebook and Ultra-Mobile Computers
Portable Data Capture Terminals
Portable Printers
Medical Diagnostics Equipment
Battery Bay Chargers
Battery Back-up Systems DESCRIPTION
The bq24751B 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 gor high regulation
accuracies, and can be either hardwired with resistors
or programmed by the system power-management
microcontroller using a DAC or GPIOs. PGND LODRV REGN HIDRV PH BTST PVCC The bq24751B 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. 28 27 26 25 24 23 22 LEARN 2 20 CELLS ACP 3 bq24751B 19 SRP ACDRV 4 28 LD QFN 18 SRN ACDET 5 TOP VIEW 17 BAT ACSET 6 16 SRSET ACOP 7 15 IADAPT BATDRV ACGOOD 10 11 12 13 14 VADJ 9 VDAC 8 VREF 21 ACN AGND CHGEN 1 OVPSET 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 …