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300mA/1.8V/2.5V Switching Regulator for Baseband Supply
2.8V/80mA LDO for Baseband Pad Supply
Two 130mA/2.8V Low-noise, High PSRR RF LDO Voltage Regulators
130mA/2.7V/2.8V Baseband Low-noise, High PSRR Analog LDO Regulator
Ultra Low-power RTC LDO Voltage Regulator
Backup Battery Charger
Li-Ion or Li-polymer Battery Charger Controller
Buzzer and Vibrator Drivers
Charging LED Driver
Power Management Start-up Controller and Reset Generation
SIM Level Shifters and SIM 10mA/1.8V/2.8V LDO Voltage Regulator
Ultra-low Sleep Mode Current Consumption (17 µA typ)
Over and Under Voltage Protections
Over Temperature Protection
Low-power Mode and Sleep Mode
Straight and Easy Interfacing to any Baseband Controller
Small 5x5mm, Forty-nine Ball FBGA Package
Power
Management for
Mobiles (PM)
AT73C202
Power and
Battery
Management
Unit for Cellular
Phone
Preliminary
Description
The AT73C202 is a low-cost, ultra low-power, power and battery management IC
designed to interface directly with state-of-the-art cellular phones, for example with
2.5G GSM phones. It includes all required power supplies tailored to be fully compati-
ble with the sub-systems of recent mobile phone chipsets, including the RF, analog
and digital (DSP, microcontroller, memories) sections.
The AT73C202 integrates a step-down DC-DC converter that supplies 300 mA with
internal switches and two levels of voltage programming for the baseband core (1.8V
and 2.5V). A low-power mode is available in order to minimize standby current con-
sumption during the “quiet” transmission periods.
In addition, the AT73C202 includes a lowcost battery charger, using a simple external
PNP transistor for Li-Ion or Li-Polymer batteries. Battery operating conditions are
maintained within safe limits under hardware control during the start-up procedure
(when the phone is turned on or a charger is plugged in). The battery pre-charge is
also integrated and self-operated by the AT73C202. On completion the fast charge
and end-of-charge procedure is transferred to the baseband software.
The AT73C202 integrates 7 low-dropout linear regulators specifically designed to sup-
ply RF (x2), analog, memories, etc. It also includes a back-up battery charger and an
ultra low-power regulator dedicated to the baseband real-time clock (RTC) supply dur-
ing sleep mode.
The hardwired start-up mechanism (power management controller state machine)
ensures safe telephone operation during the wake-up and shut-down procedures, and
during the multiple real-life operating conditions of a mobile phone (such charger plug-
in, plug-out, battery plug-in, plug-out, low or dead battery, etc.).
The AT73C202 is packaged into a 49 ball (7x7 matrix), 0.65mm pitch, 5mm x 5mm
outline FBGA package.
2740B–PMGMT–05/03
1
AT73C202
Pin Description
Table 1.
AT73C202 Pin Description
Signal
Ball
Type
Description
Charger Block
CHG-IN
GATE-CHG
CHG
DC-ON
BAT-VOLT
FLASH-LED
LED-OUT
VBAT (V
BAT1
)
D2
D3
C3
D6
F5
C1
C2
E1
Power Supply
O
I
O
O
I
O
Power Supply
AC/DC Adapter Input
External PNP control output
Charger command from Base Band chip
AC/DC Adapter detector output
Resistance Divider output
Flash LED input
LED output (Charging phase indicator)
Battery Charger
Power On Block
ON-OFF
UP-ON-OFF
RES-B
AA-GND
D5
C6
F6
E5
I
I
O
Ground
Key ON/OFF input
Hold the Power ON from Base Band chip
Reset Open collector Output
Analog ground
Baseband Supply Block
VIN-REG1 (V
BAT2
)
LX
ECO-MODE
V-CORE
GND-REG1
VIN-REG2 (V
BAT3
)
EN-ANA-B
A-VCC
A-GND
V-PAD
V-RTC
V-BCK
G6
F7
G5
G4
G7
A5
B5
B4
A7
B6
B7
A6
I
O
Ground
O
O
O
Power Supply
O
I
O
Ground
Input supply for DC/DC converter
DC/DC converter Output Inductor
DC/DC converter Output (Base Band chip Core supply)
DC/DC converter Output (Base Band chip Core supply)
Ground of DC/DC Converter
Input supply for Base Band LDO
Enable the Analog LDO
Analog LDO Output (Base Band chip Analog supply)
Ground of A-VCC, V-PAD and RTC LDO
Digital LDO Output (Base Band chip Digital PAD supply)
Base Band RTC supply output
Back-up Battery RTC charger
RF Supply Block
VIN-RF (V
BAT4
)
EN-RF1
EN-RF2
V-RF1
GND-RF
V-RF2
A3
B2
C4
B1
A2
A1
Power Supply
I
I
O
Ground
O
Input supply for RF LDO
Enable LDO RF1
Enable LDO RF2
RF1 LDO Output
Ground of RF1 & RF2 LDO
RF2 LDO Output
3
2740B–PMGMT–05/03
Table 1.
AT73C202 Pin Description (Continued)
Signal
Ball
Type
Description
Vibrator and Buzzer Driver Block
VIN-VIB (V
BAT5
)
EN-VIB
V-VIB
BUZ-IN
BUZ-OUT
BUZ-GND
D7
E6
E7
C5
B3
A4
Power Supply
I
O
I
O
Ground
Input Vibrator LDO
Vibrator driver input (from Base Band chip)
Vibrator LDO Output
Buzzer driver input (from Base Band chip)
Buzzer output (connected to the buzzer)
Ground of Buzzer Output
SIM Interface Block
D-VCC
SIM-EN
SIM-1V8/2V8
RESET-IN
CLK-IN
DATA-IO
SIM-VCC
SIM-RST
SIM-CLK
SIM-IO
G1
G3
F4
E4
F3
G2
E3
F1
F2
E2
Power Supply
I
I
I
I
IO
O
O
O
IO
Digital supply for SIM Base Band chip Interface
Input to Power ON the SIM
Input to select the SIM Level (1.8V or 2.8V)
Reset Input from base band chip
Clock Input from base band chip
Data Input/Output from base band chip
SIM Power Supply (1.8V or 2.8V)
SIM Reset Output
SIM Clock Output
SIM Data Input/Output
Miscellaneous
CREF
D-GND
BB1
C7
D1
D4
IO
Ground
I
Band gap decoupling
Ground for Digital (Charger, SIM & Vibrator)
Chip Configuration:
BB1 = 0: First Platform
BB1 = 1: Second Platform
4
AT73C202
2740B–PMGMT–05/03
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