BQ25015 Datasheet, PDF (1/28 Pages) Texas Instruments – SINGLE-CHIP CHARGER AND DC/DC CONVERTER IC FOR PORTABLE APPLICATIONS

bq25015
bq25017
www.ti.com
SLUS721A – DECEMBER 2006 – REVISED MARCH 2007
SINGLE-CHIP CHARGER AND DC/DC CONVERTER IC FOR PORTABLE APPLICATIONS
FEATURES
• Li-Ion Or Li-Pol Charge Management and
Synchronous DC-DC Power Conversion In a
Single Chip
• Charges and Powers the System from Either
the AC Adapter or USB with Autonomous
Power Source Selection
• Integrated USB Charge Control with
Selectable 100 mA and 500 mA Charge Rates
• Integrated Power FET and Current Sensor for
Up to 500 mA Charge Applications AND
300 mA DC-DC Controller with Integrated
FETs
• Reverse Leakage Protection Prevents Battery
Drainage
• Automatic Power Save Mode For High
Efficiency at Low Current, or Forced PWM for
Frequency Sensitive Applications
APPLICATIONS
• MP3 Players
• PDAs, Smartphones
• Digital Cameras
DESCRIPTION
The bq25015/7 are highly integrated charge and
power management devices targeted at
space-limited bluetooth applications. The bq25015/7
devices offer integrated power FET and current
sensor for charge control, reverse blocking
protection, high accuracy current and voltage
regulation, charge status, charge termination, and a
highly efficient and low-power dc-dc converter in a
small package.
The bq25015/7 devices charge the battery in three
phases: conditioning, constant current and constant
voltage. Charge is terminated based on minimum
current. An internal charge timer provides a backup
safety feature for charge termination. The bq25015/7
automatically re-starts the charge if the battery
voltage falls below an internal threshold. The
bq25015/7 automatically enters sleep mode when
V_CC supply is removed.
The integrated low-power high-efficiency dc-dc
converter is designed to operate directly from a
single-cell Li-ion or Li-Pol battery pack. The output
voltage is either adjustable from 0.7 V to VBAT, or
fixed at 1.8 V (bq25017) and is capable of delivering
up to 300-mA of load current. The dc-dc converter
operates at a synchronized 1 MHz switching
frequency allowing for the use of small inductors.
AC Adapter
VDC
GND
10 μF
TYPICAL APPLICATION
bq25017RHL _{PG 14}
5 AC
SW 19
10 μH
1.8 V
3 VSS
FB 2
10 μF
D+
D−
VBUS
10 μF
GND
USB Port
9 VSS
CE 15
18 VSS BAT/OUT 17
6 USB BAT/OUT 16
7 STAT1
ISET1 12
8 STAT2
ISET2 13
4 EN
FPWM 20
R_SET
Battery
Pack
PACK+
1 μF
+
PACK−
SYSTEM
sim_app2a_lus721
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2007, Texas Instruments Incorporated