X-Powers AXP202 Schematics

Single Cell Li-Battery PWM Charger and Power System Management IC

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AXP202

X-Powers

AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

1．Introduction

AXP202 is designed to be a highly-integrated power system management IC that is optimized for applications requiring single-cell Li-battery (Li-Ion/Polymer) and multiple output DC-DC converters. It is offering an easy-to-use and flexible complete solution which can fully meet the increasingly complexity of accurate power control required by modern application processor system.

AXP202 comprises an adaptive USB-Compatible PWM charger, 2 BUCK DC-DC converters, 5 LDOs,

multiple 12-bit ADCs of Voltage, current and temperature as well as 4 configurable GPIOs. To

guarantee the safty and stability of power system, AXP202 has integrated various protection circuits such as Over voltage Protection(OVP)/Under voltage Protection(UVP) 、 Over temperature protection(OTP)、Over current protection(OCP).

With Intelligent Power Select, IPS™ circuits, AXP202 can distribute power safely and transparently

among external AC-adapter, Li-battery and loaded application system, and it can still work normally

when there is no battery (deeply discharged/infective battery) but only external input power source.

The AXP202 provides a small, simple solution for obtaining power from three different power sources,

single-cell Li-Ion battery, USB port, and AC-adapter, and it can support rechargable backup battery too.

To ensure compatibility with a wide range of system processors, AXP202 uses a sTwo Wire Serial

Interface (TWSI),through which application processor is capable of enabling/disabling power rails,

programming voltage, visiting internal registers as well as measurement data (including Fuel Gauge).

With the power monitoring results of high precision (1%, determined by the 1% BIAS resistance), end

users will be always posted with the real-time power consumption, which can bring them an

unprecedented experiences of power management.

AXP202 is available in a 6mm x 6mm 48-pin QFN package.

Product Application

z Portable Handset:

Smartphone, PMP/MP4, Digital Camera, Digital Camcorder, PND, PDA, PTV

z Mobile Connected Devices

such as xPad,MID

z DPF, Portable DVD Player，

Ultra Mobile UMPC and UMPC-like，Entertainment and Education Machine

z Application Processor systems z Other battery and multi-power

Pin Description

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

2． Feature

• Intelligent Power Select(IPS)

o W ide in pu t Voltage

2.9V~6.3V (AMR：-0.3V~11V)

o Configurable highefficient IPS system o Adaptive USB(supporting USB3.0) or

AC-adaptor with voltage/current-limit

(4.4V/900mA/500mA/100mA)

o Equivelent Resistance of Batter Power Path

less than 75mΩ

• Fully Integrated PWM Cha rger

o Max Charge Current up to 1.8A o Support Battery Temperature Monitoring o Support USB compatible

charger( supporting USB3.0)

o Support Battery of Various Voltage such as

4.1V/4.15V/4.2V/4.36V

o Automatic Charge Procedure Management o Directly drive LED to indicate charge

status

o Automatical scaling of charge current

according to the System Load

• Backup Battery

o Backup Battery to Supply Power for RTC o Support Backup Battery Charge with

Adjustable Charge Current

• 2 Synchronous Duck DC-DC

o DC-DC1 : PWM Charger o DC-DC2 : 1.6A ,with Voltage from 0.7V to

2.275V and 25mV/step, supporting Voltage Ramp Control(VRC)

o DC-DC3 : 1.2A with Voltage from 0.7V to

3.5V and 25mV/step

• 5 Low-dropout Linear Regulator(LDO)

o LDO1:Always-on 30mA LDO1 o LDO2:200mA Low Noise with voltage

from 1.8V to 3.3V and 100mV/step

o LDO3:200mA with Voltage from 0.7V to

3.5V and 25mV/step

o LDO4:200mA Low Noise with voltage

from 1.8V to 3.3V and 100mV/step

o LDO5:50mA Low Noise with voltage from

1.8V to 3.3V and 100mV/step

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• Signal Capture System

o 12 channel on-chip 12-bit ADC o Support 2 external signal input o Provide Battery and External Input Power Current

and Voltage

o On-chip Coulometer and Fuelgauge with High

Precision

o Provide Various Power Management data such as

Transient Power Consumption(mA or mW), Remaining Battery Life(% or mAh)，Charge State(%) and Charge Time

o Two-level Low-Power Warning & Protection o Provide AXP202 Die Temperature

• Host Interface

o Host can exchange data with PMIC via TWSI o Flexible Interrupts and Sleep Management o Flexible Pin Function Configuration. Multiple GPIO

can be set as IO, ADC and so on

o On-chip Configurable Timer o 12 Registers for Data storage during System

Power-off

• System Management

o Support Soft Reset and Hard Reset o Support Soft Power-off and Hard Power-off o Support Exteranl Wakeup T r iggers o Support Output Voltage Monitoring and

Self-Diagnosis

o Output PWROK indicating System Reset or

Power-off

o External Power

Detection(Plugin/Removal/Inqualified Drive Capability)

o Support Soft Power-on for Input & Output o Overvoltage/Undervoltage Protection(O V P/U V P) o Overcurrent Protection(OCP) o Overtemperature Protection(OTP) o Support OTG VBUS Power State Setting/Monitoring

• Highly Integration

o Internal Reference Voltage with High Accuracy

(0.5%)

o On-chip MOSFET o Customizable Timing and Output Voltage

3． Typical Application

AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

4． Absolute Maximum Ratings

Symbol Description Value Units

ACIN Input Voltage -0.3 to 11 V

VBUS Input Voltage -0.3 to 11 V

TJ Operating Temperature Range -40 to 130

Ts Storage Temperature Range -40 to 150

T

V

LEAD

ESD

Maximum Soldering Temperature (at leads，10sec)

Maximum ESD stress voltage，Human Body Model

300

>4000 V

℃

PD Maximum Power Dissipation 2100 mW

5． Electrical Characteristics

VIN =5V， BAT=3.8V， TA= 25℃

SYMBOL DESCRIPTION CONDITIONS MIN TYP MAX UNITS ACIN

VIN ACIN Input Voltage 3.8 6.3 V

I

V

OUT

Current Available Before

OUT

500mV Voltage Drop 2500 mA

Loading BAT

V

ACIN Under Voltage Lockout 3.8 V

UVLO

V

IPS Output Voltage 2.9 5.0 V

OUT

R

Internal Ideal Diode On

ACIN

Resistance

PIN to PIN, ACIN to

IPSOUT

170 mΩ

VBUS

VIN VBUS Input Voltage 3.8 6.3 V

I

V

OUT

Current Available Before

OUT

500 900 mA

Loading BAT

V

VBUS Under Voltage Lockout 3.8 V

UVLO

V

IPS Output Voltage 2.9 5.0 V

OUT

R

Internal Ideal Diode On

VBUS

Resistance

PIN to PIN, VBUS to

IPSOUT

300 mΩ

Battery Charger

V

BAT Charge Target Voltage -0.5% 4.2 +0.5% V

TRGT

I

Charge Current 1200 1800 mA

CHRG

I

Trickle Charge Current 10% I

TRKL

CHRG

mA

V

Trickle Charge Threshold

TRKL

3.0 V

Voltage

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

ΔV

T

TIMER1

Recharge Battery Threshold

RECHG

Voltage

Charger Safety Timer

Threshold Voltage

Relative to V

Trickle Mode 40 Min

Termination Time

T

Charger Safety Timer

TIMER2

CC Mode 480 Min

Termination Time

I

End of Charge Indication

END

CV Mode 10% 15% I

Current Ratio

Backup Battery

V

Backup Battery Charge Target

TRGT

2.5 3.0 3.1 V

Voltage

I

Backup Battery Charge

CHRG

50 200 400 uA

Current

I

Current when use Backup

Backup

10 15 uA

Battery

NTC

Charge 2.112 VTL Cold Temperature Fault

Threshold Voltage

Discharge

Charge 0.397 VTH Hot Temperature Fault

Threshold Voltage

VTE NTC Disable Threshold

Voltage

Discharge

Falling Threshold

Hysteresis

Ideal Diode

R

On Resistance(BAT to

ds(on)

75 mΩ

IPSOUT)

TAR GE T

-100 mV

CHRG

mA

0

3.264

V

3.226

0

3.264

V

0.282

0.2 V

SYMBOL DESCRIPTION CONDITIONS MIN TYP MAX UNITS Off Mode Current

I

OFF Mode Current BAT=3.8V 27 μA

BATOFF

I

SUSPEND

USB VBUS suspend Mode

current

BAT=3.8V， VBUS=5V，

86 μA

N_VBUSEN=1

Logic

VIL Logic Low Input Voltage 0.3 V

VIH Logic High Input Voltage 2 V

TWSI

VCC Input Supply Voltage 3.3 V

ADDRESS TWSI Address 0x68

f

Clock Operating Frequency 400 1200 kHZ

SCK

tf Clock Data Fall Time 2.2Kohm Pull High 60 ns

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

tr Clock Data Rise Time 2.2Kohm Pull High 100 ns

DCDC

f

Oscillator Frequency Default 1.5 MHz

OSC

DCDC2

I

PMOS Switch Current Limit PWM Mode 2300 mA

LIM2

I

V

DCDC3

I

V

SYMBOL DESCRIPTION CONDITIONS MIN TYP MAX UNITS LDO1

V

Available Output Current PWM Mode 1800 mA

DC2OUT

Output Voltage Range

DC2OUT

PMOS Switch Current Limit PWM Mode 1400 mA

LIM3

Available Output Current PWM Mode 1000 mA

DC3OUT

Output Voltage Range

DC3OUT

Output Voltage I

LDO1

=1mA

0.7 2.275

0.7 3.5

1.3

-1%

3.3

1%

V

I

Output Current 30 mA

LDO1

LDO2

V

Output Voltage I

LDO2

I

Output Current 200 mA

LDO2

PSRR Power Supply Rejection Ratio

=1mA 1.8 3.3 V

LDO2

=60mA，1KHz

I

LDO2

TBD dB

eN Output Noise,20-80KHz Vo=3V , Io=150mA 28 μV

LDO3

V

Output Voltage I

LDO3

I

Output Current 200 mA

LDO3

PSRR Power Supply Rejection Ratio

eN Output Noise,20-80KHz Vo=1.8V ,

=1mA 0.7 3.5 V

LDO3

=10mA， 1KHz

I

LDO3

TBD dB

TBD μV

Io=150mA

LDO4

V

Output Voltage I

LDO3

I

Output Current 200 mA

LDO3

PSRR Power Supply Rejection Ratio

eN Output Noise,20-80KHz Vo=1.8V ,

=1mA 1.8 3.3 V

LDO3

=10mA， 1KHz

I

LDO3

TBD dB

18 μV

Io=150mA

LDO5

V

Output Voltage I

LDO5

I

Output Current 50 mA

LDO5

PSRR Power Supply Rejection Ratio

=1mA 1.5 3.3 V

LDO5

=10mA，1KHz

I

LDO5

TBD dB

eN Output Noise,20-80KHz Vo=1.8V, Io=30mA 18 μV

RMS

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Single Cell Li-Battery PWM Charger and Power System Management IC

6． Typical Characteristics

DC-DC Efficiency vs. Load(3.8Vin)

AXP202

DC-DC Load Transient(Typical)

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

DC-DC Ripple

vs Temperature

V

REF

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

vs Temperature

V

TRGT

Off Mode Current vs V

BAT

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

7． Pin Description

Num Name Type Condition Function Description

1 SDA IO Data pin for serial interface,normally it connects a

2.2K resistor to 3.3V I/O power

2 SCK I the Clock pin for serial interface,normally it connects

a 2.2K resistor to 3.3V I/O power

3 GPIO3 IO

4 N_OE I Power output on/off switch

5 GPIO2 IO REG92H[2:0] GPIO 2

6 N_VBUSEN I VBUS to IPSOUT Selection

7 VIN2 PI DCDC2 input source

8 LX2 IO Inductor Pin for DCDC2

9 PGND2 G NMOS Ground for DCDC2

10 DCDC2 I DC-DC2 feedback pin

11 LDO4 O Output Pin of LDO4

REG9EH[7]

GPIO 3

GND:on； IPSOUT:off

GND:IPSOUT select VBUS

High:IPSOUT do not select VBUS

12 LDO2 O Output Pin of LDO2

13 LDO24IN PI Input to LDO2 and LDO4

14 VIN3 PI DCDC3 input source

15 LX3 IO Inductor Pin for DCDC3

16 PGND3 G NMOS GND for DCDC3

17 DCDC3 I Feed back to DCDC3

REG93H[2:0]

19 GPIO0 IO

REG90H[2:0]

20 EXTEN O

21 APS PI Internal Power Input

22 AGND G Analog Ground

23 BIAS IO External 200Kohm 1% resistor

24 VREF O Internal reference voltage

25 PWROK O Power Good Indication Output

26 VINT PO Internal logic power, 2.5V

27 PWREN IO It is the Power domain enable signal

28 LDO1 O

GPIO 1 18 GPIO1 IO

ADC Input

GPIO 0

Low noise LDO/Switch

ADC Input

External Power Enable

LDO1 output，for Host RTC block

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Single Cell Li-Battery PWM Charger and Power System Management IC

29 DC3SET IO It set the DCDC3 default voltage

30 BACKUP IO Backup battery pin

31 VBUS PI USB VBUS input

32，33

ACIN PI Adapter input

AXP202

34，35

36 CHGLED O Charger status indication

37 TS I Battery Temperature sensor input or external ADC

38，39

40 LDO3IN O LDO3 input source

41 LDO3 I

42 BATSENSE I PWM Charger Current sense port1

43 CHSENSE O PWM Charger Current sense port2

44 VIN1 PI PWM Charger input source

45 LX1 IO Inductor Pin for PWM Charger

46 PGND1 G NMOS Ground for PWM Charger

47 PWRON I Power On-Off key input

48 IRQ IO IRQ output

49 EP G Exposed Pad, need to connect to system ground

IPSOUT IO Main Battery

input

BAT PO System power source

Output Pin of LDO3

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Single Cell Li-Battery PWM Charger and Power System Management IC

8． Functional Block Diagram

AXP202

VBUS

BAT

ACIN

N_VBUSEN

BACKUP

LX1

VIN1

PGND1

CHGLED

BATSENSE

CHSENSE

PWRON

N_OE

IRQ

SCK SDA

TS

BIAS

VREF

VINT

PWM

Charger

Serial Interface

Bat

Temperature

Monitor

Reference

Voltage

IPS

Control Logic

Register

12 bit ADC Current Monitor Voltage Monitor

Temperature Monitor

LDO1

LDO2

LDO4

LDO3

DC-DC2

DC-DC3

Output

voltage

monitor/LBO

IPSOUT APS

LDO1

N_RSTO

LDO24IN

LDO2

LDO4

LDO3

LDO3IN

DCDC2

LX2 VIN2

PGND2

DCDC3

LX3 VIN3

PGND3

DC3SET PWREN

GPIO2

GPIO1

GPIO0/LDOio0

EXTEN

PWROK

AGND EP

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

9． Control and Operation

Once AXP202 is powered on, SCK/SDA pin of TWSI will be pulled up to IO Power and then Host can

adjust and monitor AXP202.

Remarks: “Host” here refers to system processor.

Remarks: “External Power” below includes ACIN and VBUS input.

9.1 Power On/Off & Reset

Power Enable Key (PEK)

The Power Enable/ Sleep/Wakeup Key can be connected between PWRON pin and GND of AXP202.

AXP202 can automatically identify the “Long-press” and “Short-press” and then correspond

respectively.

Power on Source

1. ACIN、VBUS and battery

2. N_OE changes from high to low

3. PEK

Power On

System power-on is initiated whenever the following conditions occur:

1. N_OE is low and a valid power source has plugged in (ACIN or VBUS>3.8V, and battery voltage is

higher than power off voltage), AXP202 will be turned on. ( Developer can decide whether AXP202

shall be turned on when there is a valid power source plugging in)

2. N_OE is low and the system is powered off, press PEK can power on AXP202 (In application, Host

Alarm output signal can be connected to PWRON and parallel with PEK. Whenever there is a valid

Alarm signal ((Low Level)), AXP202 can be powered on).

3. When there is a external power source or battery, when N_OE changes from high to low, AXP202

will be turned on.

After power on, DC-DC and LDO will be soft booted in preset timing sequence, and then either Host or

PWREN pin can enable/disable corresponding power.

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AXP202

Single Cell Li-Battery PWM Charger and Power System Management IC

Power Off

When you push-and-hold PEK longer than IRQLEVEL, HOST can write “1” into“REG32H [7]” to inform

AXP202 to shutdown, which can disable all power output except LDO1.

System power-off is initiated whenever the following conditions occur:

1. input voltage is too low( Low-Power Protection)

2. Power output voltage is too low due to overload( Overload Protection)

3. Input voltage is too high( Overvoltage Protection)( See more details in chapter “ Intelligent Power

Select”

4. Have waited more than 2S(default) when N_OE changes from hight to low

5. Push PEK longer more than OFFLEVEL( Default 6S), and system will cut off all power output

except LDO1( there is no need for an extra RESET key)

Remarks: With the automatic protection mechanism, AXP202 can protect whole system by preventing

Components from irriversable damage due to system abnormality.

Sleep and wakeup

When the running system needs to enter Sleep mode, REG31H [3] will determine whether one or

several power rails should be disabled or change to other voltage. Wakeup can be triggled by either PEK signal, or the rising/falling edge of GPIO0、GPIO1、GPIO2、GPIO3 (To be the rising or falling edge, or both can be programmed by REG90H[7:6]、REG92H[7:6]、REG93H[7:6] and REG95H[7:6]), with all

power rails resume to default voltage in default power on timing sequence.

NOTE: PEK IRQ（REG42H[1]）、GPIO0 INPUT Edge IRQ（REG44H[0]）、GPIO1 INPUT Edge IRQ （REG44H[1]）、GPIO2 INPUT Edge IRQ（REG44H[2]）、GPIO3 INPUT Edge IR（REG44H[3]）should

be “Enable” to notify the processor to exit Sleep Mode via IRQ PIN.

See control process under sleep and wakeup modes as below:

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