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4.8.
Power Supplies
4.8.1 Introduction
The power management block primarily consists of SM-PWR (U304) and Companion IC (U300). U304 is a highly integrated
power management ASIC with a complete on/off logic and charging control, regulators, LED drivers, 8-ohm speaker and
vibrator driver. The companion IC is an ASIC that complements U304 providing the additional functionality like back-up battery
charging, audio switching including stereo/mono headset, boost converter and additional regulators.
J300
VBUS
I/O CN
VACC
D303
P300
BATT
Li-ION
TEMP
Battery
780
mAH
R327
BT300
The Power Management Block consists of the following sections:
1. Power Source
2. Power Control Logic
3. System Power Supply
4. Battery Charging & Monitoring
5. Accessory Detection
4.8.2
Power Source
The main battery is a single Lithium-Ion 780mAH(Li-Ion) cell with 3.7v nominal voltage. The RTC back-up battery is a Lithium-
Ion 0.5mAH coin cell with 3.0v nominal voltage. The charger supported is a 5.6v±0.4v, 700mAH
PROVISIONAL ISSUE
EXT_PWR
Charging
CKT
D302
Q301
D301
U304
R321
SM-
PWR
VBATT
VMAIN
R313
PWR
KEY
VIB
M
Keypad, Alert, Charging LED
U300
Com-
VRTC3
panion
SDBB
IC
Figure 4.11: Power Supply and Related Sub-System Block Diagram
VRTC2
SDBB
VLBB1
SDBB
VLBB2
VLBB1
VINT
VLBB2
VSIM1
VINT
V28
VSD
VSIM1
VUSB
VANA
SGOLD
VANA
VRF1
VRF2
BATT_TEMP
VRF3
SENSEOUT
RESET_N
I2C and Control I/F
LED
SLED1/2
VIB
SDBB
DCDCOUT
VLBB3
V28
VUSB
SENSEOUT
VBUS
VRTC2
VAUDIO
R252
VLBB3
R251
− 4-16 −
U102
RTC
MEMORY
Backlight
Main/Sub/
Photo
Q401
U100
VSIM1
SIM
SW
RF
F26M
U201
Bluetooth
Mini-SD
Sub-LCD
Main-LCD
U200
Camera
OMAP
IrDA
U203
MEMORY
SDBB
DCDCOUT
VSIM1
VBATT
VRF1
VRF2
VRF3
VSD
V28
V28
V28
V28
SDBB
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