LP3971_16 Datasheet, PDF (3/52 Pages) Texas Instruments – Power Management Unit for Advanced Application Processors

LP3971
www.ti.com
SNVS432V – JANUARY 2006 – REVISED MAY 2013
Li-ion/polymer cell
+
DC SOURCE
4.5 ± 5.5V
See notes
Cvdd
4.7 PF
VIN VDDA
6
27
26 14 31 20
LP3971 PMIC
SYNC
40
35
APPLICATION
PROCESSOR
Cchg_det
4.7 PF
VinBUBATT ₁₅
VoutLDO_RTC
COMP
EOC
Vout
Switch
Clock
divider
BUCK1
BUCK2
PWR_ON ₁
GPIO1/nCHG_EN ₂₉
nTEST_JIG 2
GPIO2 30
SPARE 3
nRSTI ₉
Internal HW reset for
test purposes
CODEC
VoutLDO2 8
Cldo1
1.0 PF
OSC
Wake up
BUCK3
VIN
LDO1
Power
ON-OFF
Logic
LDO3
RESET
VinLDO4
Logic Control _VinLDO5
and registers
LDO4
PWR_EN
LDO5
VIN SYS_EN
LDO2
VDDA
LDORTC
Vout Switch
Power On
Reset
Thermal
I2C
Shutdown
BIAS
vref
VREF
Cvrefh
10 nF
11
38
18
33
PGND1 PGND2 PGND3
34
10
BGND1,2,3 GND1
37 _{PWR_EN}
Lsw1 2.2 PH
39
SW1
VFB1
5
Lsw2 2.2 PH
19
10 PF
VBUCK2
SW2
VFB2
23
Lsw3 2.2 PH
32
SW3
VFB3
28
SYS_EN
10 PF
10 PF
36
VoutLDO1
7
Cldo2
0.47 PF
VoutLDO3
12
Cldo3
0.47 PF
VoutLDO4
13
Cldo4
0.47 PF
VoutLDO5
25
Cldo5
0.47 PF
16 ^VoutLDO_RTC
CldoRTC
1.0 PF
See notes
3.3V
10k
22 _{I2C_SCL}
10k
21 _{I2C_SDA}
24 _nRSTO
4 EXT_WAKEUP
17 _{nBATT_FLT}
• The I²C lines are pulled up via a I/O source
• V_INLDO4, 5 can either be powered from main battery source, or by a buck regulator or V_IN.
Figure 2.
CPU
CORE
USB
UART
BG
MVT
AP_IO
PLL
SRAM
RTC
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