LP8765
High Performance Power Management Unit for Handset
Applications
General Description
Features
The LP8765 is a complete Power Management Unit (PMU)
designed for handset applications. The LP8765 PMU contains a 28V Over-Voltage Protection (OVP) single-input linear
Li-Ion battery charger, backup battery charger, 10 lowdropout voltage regulators including 4 A-type LDOs, 4 D-type
LDOs, one LILO LDO and one 28V OVP LDO, 2 high-efficiency buck regulators, 2 comparators, 3 current sinks, 12-bit
ADC, real-time clock, 32 KHz OSC and one 2.5V reference
output voltage. Programming is handled via a high-speed serial interface to program on/off conditions and output voltages
of individual regulators, and to read status information of the
PMU.
The LP8765 can safely charge and maintain a single cell LiIon battery operating from an AC adapter or USB power
source.
The Li-Ion charger requires few external components and integrates the power FET. Charging is thermally regulated to
obtain the most efficient charging rate for a given ambient
temperature.
A built-in OVP circuit at the charger inputs protects the PMU
from input voltages up to +28V, eliminating the need for any
external protection circuitry.
Buck regulators have an automatic switch to PFM mode at
low-load conditions providing very good efficiency at low-output currents.
A-type LDO regulators provide excellent PSRR and very low
noise, 10 µV typ., ideally suited for supplying voltage to RF
section.
The real-time clock/calendar provides time interval information as well as two programmable alarms.
The current sink provides 4-bit current resolution with 6-bit
PWM dimming, up to 120 mA maximum load current.
Two general-purpose comparators can be used for detecting
external accessories like ear plugs, etc.
■ Linear Li-Ion Battery Charger with Single Input
© 2011 National Semiconductor Corporation
301620
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50 mA to 1200 mA Charging Current
4.05V to 4.75V Termination Voltage
28V OVP on the VIN_CHG Input
Charging from either AC Adaptor or USB
Two Synchronous Magnetic Buck Regulators
IOUT 600 mA and 500 mA
High-efficiency PFM mode @ low IOUT
Auto-Mode PFM/PWM Switch
Programmable Peak Switching Current Limit
Low-Inductance 2.2 µH @2 MHz Switching Frequency
3% Accurate Buck Regulators up to 90% Efficiency
LDOs
4 x A-type LDOs (3 x 200 mA, 1 x 100 mA)
4 x D-type LDOs (2 x 200 mA, 1 x 300 mA, 1 x 400 mA)
1 x LILO LDO (1 x 300 mA)
1 x 28V OVP LDO for USB Transceiver (1 x 10 mA)
10 µV noise on A-type LDOs
2% typ. Output Voltage Accuracy on LDOs
12-bit A/D Converter
Three Controllable Current Sinks
Two Comparators
Interrupt Request to Reduce S/W Polling
32.786 KHz OSC
Real-Time Clock with Two Programmable Alarms
Thermal Shutdown with Early Warning Alarm
49-bump micro SMD package 3.7 x 3.7 mm, 0.5 mm pitch
Applications
■ GSM, GPRS, EDGE, CDMA & 3G Handsets
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LP8765 High Performance Power Management Unit for Handset Applications
September 7, 2011
LP8765
Table of Contents
General Description .............................................................................................................................. 1
Features .............................................................................................................................................. 1
Applications ......................................................................................................................................... 1
General Typical Application Diagram ....................................................................................................... 3
Device Pin Diagram .............................................................................................................................. 4
Package Marking Information ................................................................................................................. 4
Ordering Information ............................................................................................................................. 4
LP8765 Pin Descriptions ........................................................................................................................ 5
Device Operation Description ................................................................................................................. 6
OPERATION MODES .................................................................................................................... 6
POWER-ON AND POWER-OFF SEQUENCES ................................................................................. 8
Support Functions ............................................................................................................................... 10
REFERENCE ............................................................................................................................. 10
OSCILLATOR ............................................................................................................................. 10
REFERENCE VOLTAGE (2.5V) .................................................................................................... 10
OPERATING VOLTAGE MONITOR ............................................................................................... 10
THERMAL SHUTDOWN .............................................................................................................. 10
Absolute Maximum Ratings .................................................................................................................. 11
Operating Ratings (Note 1, Note 2) ......................................................................................................... 11
Thermal Properties ............................................................................................................................. 11
General Electrical Characteristics ......................................................................................................... 11
Linear Li-Ion Battery Charger with Single Input ....................................................................................... 13
CHARGER FUNCTION ................................................................................................................ 13
END-OF-CHARGE (EOC) FUNCTION ........................................................................................... 13
EOC & BATTERY DEFAULT SETTING .......................................................................................... 13
HIGH-CURRENT MODE .............................................................................................................. 13
Buck Converters ................................................................................................................................. 15
CIRCUIT OPERATION ................................................................................................................. 15
PWM OPERATION ...................................................................................................................... 15
PFM OPERATION ....................................................................................................................... 15
INTERNAL SYNCHRONOUS RECTIFICATION .............................................................................. 16
CURRENT LIMITING ................................................................................................................... 16
SOFT-START ............................................................................................................................. 16
LOW-DROPOUT OPERATION ..................................................................................................... 16
LDO's ............................................................................................................................................... 18
A/D Converter .................................................................................................................................... 21
A/D CONVERTER DATA AND CONTROL REGISTERS ................................................................... 21
MEASUREMENT RESULT CALCULATION .................................................................................... 21
WORKING RANGE AND ACCURACY ........................................................................................... 21
S&H .......................................................................................................................................... 21
Real-Time Clock ................................................................................................................................. 22
RTC UNLOCK FUNCTION ........................................................................................................... 22
Backup Battery Charger ...................................................................................................................... 23
32.768 kHz Crystal Oscillator ............................................................................................................... 23
Comparators ...................................................................................................................................... 23
3 Current Sinks .................................................................................................................................. 25
SINK DRIVERS ........................................................................................................................... 25
I2C-Compatible Serial Bus Interface ...................................................................................................... 26
INTERFACE BUS OVERVIEW ...................................................................................................... 26
DATA TRANSACTIONS ............................................................................................................... 26
START AND STOP ...................................................................................................................... 26
ACKNOWLEDGE CYCLE ............................................................................................................. 26
Physical Dimensions ........................................................................................................................... 27
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2
LP8765
General Typical Application Diagram
30162001
3
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LP8765
Device Pin Diagram
30162002
TOP VIEW
49-Bump (0.5 mm pitch) micro SMDxt Package
Package Marking Information
30162003
Ordering Information
Order Number
LP8765RLE
LP8765RLX
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Package Type
Product ID
micro SMD xT
8765
4
Supplied As
250 Units on Tape & Reel
1000 Units onTape & Reel
LP8765
LP8765 Pin Descriptions
Pin #
Name
Type
Description
F5
ADC1
A
ADC input for Battery thermal NTC thermal monitor, also used for battery detection.
E5
ADC2
A
Reserved Pin for external ADC usage
G6
BATT
P
Main Battery connection
F3
FB_B1
A
Buck1 feedback
E1
FB_B2
A
Buck2 feedback
G3
GND_B1
G
Buck1 GND
F1
GND_B2
G
Buck1 GND
D4
GND_LDO
G
LDOs GND
B2
GND_SINK
G
SINKs GND
F2
GPIO1
DI
Used for Enable1
E2
GPIO2
DI
Used for Enable2
E3
GPIO3
DI
Used for Enable3
B4
INP1
DI
Comparator Input1
C4
INP2
DI
Comparator Input1
E4
IRQ_N
DO
Interrupt output, active low (Open Drain)
E6
LDO1
A
LDO1 output
C7
LDO2
A
LDO2 output
E7
LDO3
A
LDO3 output
D6
LDO4
A
LDO4 output
A7
LDO5
A
LDO5 output
C6
LDO6
A
LDO6 output
B6
LDO7
A
LDO7 output
A6
LDO8
A
LDO8 output
C1
LDO9
A
LDO9 output
C5
OSC_32KHz
A
32 KHz clock buffer output to BB
B5
PS_HOLD
DI
Control input from BB
C2
PWR_ON
DI
Power switch on input
D5
REF_OUT
A
2.5V reference output for ADC (load current should be less than 1mA)
D2
RSTIN_N
DI
Reset input, active low
F4
RSTOUT_N
DO
Reset output, active low (Open Drain)
D3
SCL
DI
Serial interface clock input, external pull up 1.5K to LDO5
C3
SDA
DI/O
B1
SINK1
A
Current Sink1 Input
A1
SINK2
A
Current Sink2 Input
A2
SINK3
A
Current Sink3 Input
Serial interface bi-directional data, external pull up 1.5K to LDO5
B3
SLEEP_N
DI
Sleep Mode input, active low
G4
SW_B1
A
Buck1 switch note
G1
SW_B2
A
Buck2 switch note
A3
VCOIN
A
Backup battery connection
G5
VIN_B1
A
Buck1 input
G2
VIN_B2
A
Buck2 input
G7
VIN_CHG
P
DC power input to charger block (AC adaptor or USB)
F6
VIN_CHG SENSE
DO
D7
VIN1
A
VIN_CHG pin testing point (test purpose only) and leave this pin floating.
LDOs Input1
B7
VIN2
A
LDOs Input2
D1
VIN3
A
LILO LDO input
F7
VTRM
A
3.3V LDO output for USB transceiver
5
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LP8765
Pin #
Name
Type
A5
XIN
A
External crystal oscillator IN
A4
XOUT
A
External crystal oscillator OUT
A:
DI/O:
G:
Description
Analog Pin
Digital Input/Output Pin
Ground
D:
O:
Digital Pin
Output Pin
I:
P:
Input Pin
Power Pin
Device Operation Description
OPERATION MODES
POWER-ON-RESET: In POWER-ON RESET mode all internal registers are reset to the default values.
STANDBY:
In STANDBY mode all PMU functions are disabled except BB charger, 32 KHz OSC & RTC.
START UP:
Startup sequence is triggered by setting Power-on-Switch (PWR_ON) high for 100 ms or connecting a
suitable voltage to charger input (VIN_CHG). For RTC ALARM events the startup sequence begins after
2ms delay from the RTC events. During the startup sequence, the 2.5V reference voltage will be powered
by either charger block or battery first in order to detect battery existing. If there is a battery and the battery
voltage is over OPVM, then the default on regulators (Buck1, Buck2 & LDO5) will be enabled according to
a pre-programmed timing pattern. If the regulators are enabled, RSTOUT_N is released, allowing the processor to start up. PS_HOLD must be set high within a programmed timer* (8s max) from the start of
STARTUP state; this is true for all startup events except PWR_ON. For PWR_ON startup, PMU stays in
POWER ON state when PWR_ON is held high, and the PS_HOLD must be set high before the PWR_ON
goes low or Power-on-Switch is released. Otherwise, PMU will go to SHUTDOWN state.
If there is no main battery detected (voltage at ADC1 pin is about 2.4V), PMU will not start the startup
sequence. In other modes, the PMU will not enable the charger. If the main battery is removed when
PMU is running, then Charger will be disabled immediately to force UVLO shutdown.
If two-pin battery is used then ADC1 pin should be connect to GND through a resistor or floating in
order to start up the PMU normally. However, there will be no battery exiting detection.
IDLE:
PMU will enter into IDLE mode (normal operating mode) after PS_HOLD signal is asserted by the host
processor. IDLE mode will enable all PMU functions that can be controlled by the Serial Interface or direct
control inputs. PS_HOLD going low for 10 ms, VDD voltage below UVLO, Chip temperature over TSDH,
or a flag failure in a monitored regulator (LDO5) for 10 ms will initiate a SHUTDOWN Sequence.
SLEEP:
When BB pulls SLEEP_N pin LOW, the PMU will not do anything except setting BUCKs and LDOs to lowpower mode in order to minimize quiescent current if LDOs_LOW_PWR_IN_SLEEP and
BUCKs_LOW_PWR_IN_SLEEP bits are set to 1, otherwise both BUCKs and LDOs will stay in normally
mode. However, in low-power mode, the summary of total load current of BUCKs or LDOs should stay
below 5mA. Buck1 has two preset voltages (BUCK1 NORMAL & BUCK1 SLEEP); BUCK1 output equals
BUCK1 SLEEP when SLEEP_N pin is low, and goes back to BUCK1 NORMAL when SLEEP_N is high.
By default, BUCK1 SLEEP & NORMAL are same 1.2V. In this mode, only LDO1, LDO2, LDO3, LDO4 and
LDO9 can be enabled/disabled through GPIO pins (EN1,2&3). If I2C communication is disabled during
sleep, then for other power regulators, BB need to turn them off through I2C before SLEEP_N goes to 0.
Otherwise, these power regulators will stay on during BB sleep. The condition of going to SHUTDOWN
state is the same as in IDLE state. Please see Register Maps for detail.
SHUTDOWN:
In this state, RSTOUT_N is pulled low, and all regulators are disabled according to pre-programmed timing
pattern (opposite of STARTUP sequence). After this, all registers are reset to default values except address
xxxx, then PMU will go to STANDBY state.
SYSTEM RESET:
PMU goes to SYSTEM RESET mode if RSTIN_N input has been pulled low for xxms**. There are two
different reset methods:
1. Cold reset (EN_RSTIN_SHUTDOWN = high); PMU will go to SHUTDOWN state first and then initiate
STARTUP event automatically. PS_HOLD must be high within programmed PS_HOLD timer, otherwise
PMU will go to SHUTDOWN state.
a. Enable shutdown and enter EPROM READ + PREPARE mode, active the pulldown (Total time = 33
ms);
b. Disable the pulldown and enter STARTUP mode;
c. Wait 100 ms; and
d. Enter Normal working mode.
2. Hot reset (EN_RSTIN_SHUTDOWN = low); PMU will pull low RSTOUT_N and disable all the power
regulators except BUCK1, BUCK2, LDO5(DLDO1), REF_OUT. A STARTUP event then initiates automatically, and PS_HOLD must be high within programmed PS_HOLD timer, otherwise PMU will go to
SHUTDOWN state.
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LP8765
30162004
* Note 1: PS_HOLD timer is programmable 1.5s, 2s, 4s, and 8s.
** Note 2: RSTIN_N timer is programmable 0.5 ms, 1.0 ms, 2.0 ms 33 ms.
7
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LP8765
POWER-ON AND POWER-OFF SEQUENCES
30162005
Default on power rail startup sequence: 2.5V reference voltage→LDO5 → Buck2 → Buck1.
Power-Off sequence is in reverse order of startup sequences.
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LP8765
LP8765 POWER REGULATOR SPEC TABLE
Loads
Voltage
Range (V)
Default
Voltage
(V)
Current
Rating
[mA]
Default
ON (Y/N)
Turn-on
Sequence
Voltage
Steps
(mV)
ON/OFF
Control
BUCK1
Core1
0.8 - 1.45
1.2
600
Y
T0+128µs
50
S/I(always on)
BUCK2
IO&Memory
0.8 - 2.1
1.8
500
Y
T0+64µs
50
S/I(always on)
LDO1 (ALDO1) 26M, VCTCXO
1.5 - 3.0
2.85
100
N
-
50
S/I AND GPIO1
(EN1)
LDO2 (ALDO2)
RF IC
1.5 - 3.0
2.85
200
N
-
50
S/I AND GPIO1
(EN1)
LDO3 (ALDO3)
RF IC
1.5 - 3.0
2.85
200
N
-
50
S/I OR GPIO1
(EN1)
LDO4 (ALDO4)
RF IC
1.85 - 3.4
2.85
200
N
-
50
S/I AND GPIO2
(EN2)
LDO5 (DLDO1) IO&Cam&LCD
1.5 - 3.3
3
400
Y
T0
100
S/I(always on)
LDO6 (DLDO2)
USIM1
1.8 or 3.0
1.8
200
N
-
-
S/I
LDO7 (DLDO3)
USIM2&IO
1.5 - 3.3
1.8
200
N
-
100
S/I
-
S/I
Outputs
VTRM (DLDO4)
USB Xcvr
3.3 fixed
3.3
10
Y
Always as
long as the
USB/Adaptor
plugged
LDO8 (DLDO5)
SDIO
1.5 - 3.3
3
300
N
-
100
S/I
LDO9 (DLDO6)
Core2
0.8 - 1.5
1.2
300
-
-
50
S/I AND GPIO3
(EN3)
REF_OUT
ADC
Ref_Voltage
2.5
2.5
1
Y
Always
-
S/I(always on)
9
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LP8765
THERMAL SHUTDOWN
The Thermal Shutdown (TSD) function monitors the chip temperature to protect the chip from temperature damage
caused, e.g. by excessive power dissipation. The temperature monitoring function has two threshold values that result
in protective actions. When a lower threshold of +125°C is
exceeded, the TSDL bit in the Register 0x08 will be set and
an “early warning” interrupt, unless masked, is generated to
the processor. A read operation on the TSDL bit will reset it if
the temperature has decreased to lower than 10°C below the
threshold. If the temperature exceeds a higher threshold value of +160°C, the TSDH bit in the Register 0x08 is set, and
the chip will automatically go to the Power-Off sequence. A
read operation on the TSDH bit will reset it. Power On can be
activated only if the junction temperature is less than the early
warning lower threshold +115°C.
Support Functions
REFERENCE
LP8765 has an internal reference block creating all necessary
references and biasing for all blocks.
OSCILLATOR
There is an internal oscillator giving clock to the bucks and to
logic control (2MHz typ.).
REFERENCE VOLTAGE (2.5V)
Parameter
Typ.
Min.
Max.
REF_OUT
2.5V
2.425
2.575V
V
Load
(typ.)
100 µA
OPERATING VOLTAGE MONITOR
There is Operating Voltage Monitor (OPVM) that checks
VDD-pin voltage before starting Power-On sequence. OPVM
is also checked during Power-On sequence. If the VDD voltage is less than OPVM threshold LP8765 will not power on.
After LP8765 successfully passed Power-On sequence
OPVM is not monitored.
Parameter
Typ.
Min.
Max.
Unit
OPVM threshold
3.1
3.0
3.25
V
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Parameter
Typ.
Higher Threshold*)
160
Early Warning*)
125
Early Warning Hysteresis*)
10
*) Guaranteed by design.
10
Unit
°C
Operating Ratings
2)
VIN_CHG (Note 10)
BATT
VCOIN
VIN1, VIN2, ViN_B1, VIN_B2
VIN3
All input-output pins
Junction Temperature (TJ) Range
Ambient Temperature (TA)
Maximum Power Dissipation
(Note 5)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN_CHG, VIN_CHG SENSE
VBATT, VIN1, VIN2, VIN_B1,
VIN_B2
VIN3
VCOIN
SINK1&2
SINK3
All other input-only pins
Junction Temperature (TJ-MAX)
Storage Temperature
Maximum Continuous Power
Dissipation
PD-MAX
ESD (Note 4)
VIN_CHG, BATT, GND,
ADC1&2, PWR_ON, RSTIN_N
All other
−0.3V to +28V
−0.3V to +6V
-0.3 to +4.5V
−0.3V to +4V
−0.3V to VBATT+0.5V
and < 6V
−0.3V to 10V
−0.3V to VBATT+0.3V,
max 6V
150°C
−40 to 150°C
(Note 3)
(Note 1, Note 2)
4.5V to 6.8V
3.0V to 5.5V
2.0V to 3.6V
2.5V to VBATT
0.7V to 4.5V
0V to VBATT
−40°C to +125°C
−40°C to +85°C
1.4W
Thermal Properties
(Note 9)
Junction-to-Ambient Thermal
Resistance (θJA)
(Jedec Standard Thermal PCB)
38.6°C/W
8 kV HBM
2 kV HBM
General Electrical Characteristics
CURRENT CONSUMPTION
Unless otherwise noted, VBATT (=VVIN1=VVIN2=VVIN3=VVIN_B1=VVIN_B2) =3.7V, GND (=GND_B1=GND_B2=GND_LDO=GND_SINK)
=0V, CVIN_CHG=CVIN_B1=CVIN_B2=CBUCK1=CBUCK2= CVIN1=CVIN2=10 μF, CLDOx=CVTRM=CCOIN=1μF. Typical values and limits appearing in normal type apply for TJ=25°C. Limits appearing in boldface type apply over the entire junction temperature range for
operation, TJ= −40°C to +125°C . (Note 6)
Symbol
Parameter
Conditions
IQ(STANDBY)
Battery Standby Current
IQ(SLEEP)
Battery Current in SLEEP Mode
@ 0 load
Typ
COIN on, no load
35
COIN off, no load
4
SLEEP_EN=LOW (Buck1, Buck2,
LDO5, COIN & REF_OUT on)
Limit
Min
Max
Units
µA
165
LOGIC AND CONTROL
Unless otherwise noted, VBATT (=VVIN1=VVIN2=VVIN3=VVIN_B1=VVIN_B2) =3.7V, GND (=GND_B1=GND_B2=GND_LDO=GND_SINK)
=0V, CVIN_CHG=CVIN_B1=CVIN_B2=CBUCK1=CBUCK2= CVIN1=CVIN2=10 μF, CLDOx=CVTRM=CCOIN=1μF. Typical values and limits appearing in normal type apply for TJ=25°C. Limits appearing in boldface type apply over the entire junction temperature range for
operation, TJ= −40°C to +125°C. (Note 7)
Symbol
Parameter
Conditions
Typ
Limit
Min
Max
Units
Logic and Control Inputs
VIL
Input Low Level
VIH
Input High Level
VIL
Input Low Level
VIH
Input High Level
VIL
Input Low Level
VIH
Input High Level
0.9
PWR_ON
V
1.5
0.4
GPIO1-3
V
1.3
0.35
SDA,SCL
1.3
11
V
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LP8765
Absolute Maximum Ratings (Note 1, Note
LP8765
Symbol
VIL
Parameter
Conditions
Typ
Limit
Min
0.2*
VLDO5
Input Low Level
SLEEP_N, PS_HOLD, RSTIN_N
VIH
Input High Level
ILEAK
Input Current
SDA, SCL, SLEEP_N, PS_HOLD,
GPIO1-3 0V
