BQ24721 Datasheet, PDF (2/48 Pages) Texas Instruments – ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

bq24721
SLUS683 – NOVEMBER 2005
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device
placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
PART NO.
bq24721
PACKAGE
32 PIN
5x5mm QFN
ORDERING INFORMATION
THERMISTOR
SENSE
BATTERY SHORTED
(VERY LOW BATTERY
VOLTAGE) OPERATION
TS
Charge Current Changes to
C/8
ORDERING NUMBER
(TAPE AND REEL)
bq24721RHBR
bq24721RHBT
QUANTITY
3000
250
PACKAGE THERMAL DATA
PACKAGE ⁽¹⁾
RHB ⁽²⁾
θ_JA
36°C/W
TA ≤ 40°C
POWER RATING
2.36 W
DERATING FACTOR
ABOVE T_A = 25°C
0.028 W/°C
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
Web site at www.ti.com.
(2) This data is based on using the JEDEC High-K board and the exposed die pad is connected to a copper pad on the board. This is
connected to the ground plane by a 2×3 via matrix.
DEVICE INFORMATION
TERMINAL
NAME
NO.
CHGEN
1
ACDRV
2
ACN
3
ACP
4
ACDET
5
BYPASS
6
EAO
7
EAI
8
FBO
9
AGND
10
VREF5
11
VCC
12
SDA
13
SCL
14
TS
15
ISYNSET 16
TERMINAL FUNCTIONS
DESCRIPTION
TERMINAL
NAME NO
Charge enable logic level low input
IOUT
17
AC adapter to system switch driver output
BAT
18
Adapter current sense resistor, negative input SRN
19
Adapter current sense resistor, positive input SRP
20
AC adapter detected sense voltage input
SYNN
21
Adapter Schottky diode bypass switch
SYNP
22
Error amplifier output for compensation
SYS
23
Error amplifier input for compensation
BATDRV 24
Feedback output for compensation
ALARM
25
Analog ground
PGND
26
5V regulated voltage output. Can be used to
indicate ac present status
LODRV
27
IC analog positive supply
REGN
28
SMBus Data input
SMBus Clock input
Thermistor sense input
Program SRUC of charge regulator
PH
29
HIDRV
30
BTST
31
PVCC
32
DESCRIPTION
Battery charger or adapter current amplifier
output
Battery voltage remote sense
Charge current sense resistor, negative input
Charge current sense resistor, positive input
SROC and SRUC, Negative sense resistor in
SROC and SRUC, Positive sense resistor in
System load, voltage sense
Battery to system switch driver output
Alarm indicating charger status change,
open-drain output
Power ground
PWM low side driver output
Low-side driver gate voltage regulator. Add
1uFfilter capacitor
High-side driver negative supply, connect
neg-side of boot-strap capacitor
PWM high side driver output
High-side driver positive supply, connect
pos-side of boot-strap capacitor.
IC power positive supply
2