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FUNCTIONALITY GUIDE — SYSTEM POWER AND CHARGE MANAGEMENT
AC
BAT
OUT
USB
TMR
ISET
1
TS
BAT
OUT
DPPM
POWERPATH
CONTROL
LINEAR
CHARGER
Battery
GND
+
-
AC _DC Adapter
Output
USBPower
ACSWITCH
USBSWITCH
BATTERY
SWITCH
SYSTEMPOWERBUS
TPS 65810
Withtheabovecomponentsthefollowingsystem
parametersareset :
FastChargeCurrent = 1A (100% scaling, inputlimit=2. 5A)
Safety Timer = 5hours, 30 minpre-charge
DPPMthreshold = 4. 3V
Temphot: 65C
TempCold : 5C
SystemPower
Selection
InputCurrentLimit
Selection
ChargeVoltage
FastCharge
CurrentScaling
ChargeSuspend
I2CREGISTERS
R
37.4k
DPPM
W
A1
C26
22 Fm
C25
10 Fm
50k
NTC
W
R
49.9k
TMR
W
C2
10 Fm
C23
47nF
A1
R
1k
SET
W
A1
C24
0.22 Fm
A1
C1
10 Fm
POWER PATH AND CHARGE MANAGEMENT
Overview
TPS65810
TPS65811
SLVS658B – MARCH 2006 – REVISED FEBRUARY 2007
CHARGE MANAGEMENT
Fast Charge
(1)
Precharge Termination Charge Precharge SafetyTimer Power Up
Current Voltage Voltage Timeout Default
Charge Charge Current Current Current Scaling
Current Value Scaling
I
O(BAT)
, 25%, 50%, 75%, 10% of I(TERM), 10% of 25%, 50%, 75%, 4.2 V or 3.0 V Programmable Charger OFF
Programmable, 100% of I
O(BAT)
I
O(BAT)
I
O(BAT)
100% of I
(TERM)
4.36 V
1.5A max value
Set via external Fixed ratio Fixed ratio Fixed Set via external
Set via I
2
C Set via I
2
C Set via I
2
C
resistor resistor
(1) The input current limit (see system power management below ) regulates the input current, effectively limiting the charge current if the
input current limit is lower than the fast charge current value programmed.
POWER PATH MANAGEMENT
INPUT CURRENT LIMIT INPUT CONNECTED TO OUT PIN POWER UP DEFAULT
AC PIN USB PIN INPUT POWER TO SYSTEM BATTERY TO SYSTEM
2.5 A typ 100 mA max or #1 – AC Battery connected to system, Input Power to System,
500 mA max or #2 – USB independently of battery USB mode selected,
2.5 A typ #3 – Battery (when AC pin power and USB pin power are voltage 100 mA max
not detected )
Internal fixed Automatic internal algorithm
Set via I
2
C Set via I
2
C, overrides
current limit
internal algorithm
Figure 30. Required External Components, Recommended Values, External Connections
The TPS65810 has an integrated charger with power path integrated MOSFETs. This topology, shown in the
simplified block diagram below, enables using an external input power to run the system and charge the battery
simultaneously. The power path has dual inputs that can be used to select either an external AC_DC adapter
(AC pin) or an USB port power (USB pin) to power the end equipment main power rail (OUT pin, also referred to
as the system power bus) and charge the battery pack (connected to BAT pin).
Copyright © 2006 – 2007, Texas Instruments Incorporated Submit Documentation Feedback 41
Product Folder Link(s): TPS65810 TPS65811