Diodes AUR9807 User Manual

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Data Sheet

General Description

The AUR9807 is a single-cell Li-ion charger IC with
system power management feature. It charges the
battery and power the system simultaneously. The
maximum charging current (up to 1.5A) is set by
external resistor for fast charging. The output
voltage for the system is regulated to a nominal
value (three different versions available: 4.4V, 5V or
6V); the actual value of the output voltage depends
on the input voltage from the adapter, the charging
current and the system loading. With the decrease of
the input voltage or the increase of the system
loading current, the output voltage drops. When the
output voltage drops to a predetermined value
(V
is activated and tries to maintain the output voltage
at V
loading with first priority and reduce the charging
current temporarily, i.e. under heavy load condition,
the AUR9807 charges the battery with the remaining
available current to keep the output voltage at V
In this manner, the charge and discharge cycle of the
battery can be reduced.

It is possible that the AUR9807 fails to maintain the
output voltage at V
system loading current exceeds the capability of the
current-limiting AC adapter. In this scenario, the
output voltage drops to the battery voltage, and the
system is allowed to draw current from the battery.

The AUR9807 is available in QFN-4.5×3.5-20
package.

), the Active Power Management function

APM-REG

; the AUR9807 will suffice the system

APM-REG

; for example, when the

APM-REG

APM

Features

• QFN Package

• Active Power Management (APM) for
Simultaneously Powering the System and
Charging the Battery

• Total Current Supported Up to 2 Amperes

(System Loading Having Higher Priority on the
Budget)

• Automatic Power Source Selection (AC Adapter

or Battery)

• 40m Power Path for the Battery to Supply the

System Power Efficiently

• Junction Temperature Detection and Thermal

Regulation During Charging Process

• External LED Indicating Charger and Power

Good Status as Well as Fault Condition

• Thermal, Short-Circuit, and Reverse Current

Protection

• Short-Circuit Protection in the Low Power

Consumption Sleep Mode

• SYSOFF Function to Cut Off the Path Between

.

the System and the Battery

• Built-in Over Voltage Protection up to 18V

Applications

• Battery-Powered Devices or Equipment

• Mobile Phones, Digital Cameras and MP3

Players

• Radios, Other Hand-Held Games and Instruments

• Solar Power System

Figure 1. Package Type of AUR9807

QFN-4.5×3.5-20

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

1

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Pin Configuration

D Package
(

Pin 1 Mark

STAT1

2

QFN-4.5×3.5-20

VREF

1

20

)

GND

19

GND

STAT2

BAT

BAT

ISET2

MODE

CE

IN

3

4

5

6

Exposed

Pad

7

8

9

10

11

18

17

16

15

14

13

12

/PG

OUT

OUT

OUT

TMR

APM

TS

ISET1

SYSOFF

Figure 2. Pin Configuration of AUR9807 (Top View)

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

2

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Pin Description

Pin Number I/O Pin Name Function

1 O VREF

2 O STAT1 Charge status flag 1 (open-drain)

3 O STAT2 Charge status flag 2 (open-drain)

4 I IN Chip input voltage

5 , 6 I/O BAT

7 I ISET2

8 I MODE Set AUR9807 in AC(High) or USB(Low) mode

Internal reference; VREF output capacitor not required, but
one with a value of 0.1µF is recommended.

Battery connection; charging or discharging all through this
pin
USB mode total current selection (High=450mA, Low=
90mA) and AC mode charge current selection (High=Full
current, Low=half current)

9 I CE Chip enable (active high)

10 I/O ISET1 Set the maximum charging current

11 I SYSOFF Cut off the power path between the battery and the output pin

12 I/O TS Battery Temperature sensing

13 I APM

14 I/O TMR

15 , 16 , 17 O OUT System output

18 O /PG Power-good status flag (open-drain)

19 , 20 I GND Chip Ground

Active Power Management set point ※ no need for
capacitors
Timer program by external resistor connected to this pin.
Tying TMR and VREF together to disable the safety timer

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

3

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Functional Block Diagram

4

IN

UVLO

Power Source

V

SET

SYSOFF

GND

TMR Oscillator

APM

11

19, 20

14

13

Selection

100mA
500mA

V

V

OUT

OUT(REG)

I

AMP

V

ISENSE

V

V

BAT

BAT(REG)

V

SET

V

APM

Short-Circuit

Recovery

Q1

V

I(ISET1)

V

SET

T

J(REG)

15, 16, 17

V

OUT

10

V

I(ISET1)

5, 6
V

1

BAT

VREF

OUT

ISET1

BAT

3.3V

I

SENSE

BAT

Fault

Recovery

T

J

Recovery

Short-Circuit

V

BAT

V

OUT

Q2

1V

V

HTF

Thermal

Shutdown

V

LTF

AC Charge Enable

BAT Charge Enable

500mA/100mA

TS

1V

12

I

TS

Fast Precharge

MODE

CE

8

9

V

BAT

V

RCH

V

I(ISET1)

V

TERM

Power Source Selection

Recharge

V

V

BAT

LOWV

V

BAT

V

IN

Precharge

Termation

Sleep

Charge

Control Timer

and Display

Logic

1C - 500mA

C/S - 100mA

18

7

ISET2

/PG

2

STAT1

3

STAT2

Figure 3. Functional Block Diagram of AUR9807

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

4

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Ordering Information

AUR9807

Circuit Type

Package

QFN-4.5x3.5-20

Temperature

Output Voltage
VF: 4.4V, CV Mode
DF: 4.4V, Done
VI: 5V, CV Mode
DI: 5V, Done
VS: 6V, CV Mode
DS: 6V, Done

CV mode: After charge done, charger will stay in constant
voltage mode until time out.
Done: After charge done, charger will shut down until the
battery voltage drops below the battery recharge threshold.

Range

-40 to 85°C

Output Voltage Part Number Marking ID

4.4V, CV Mode AUR9807VFGD A9807VFG Tape & Reel

4.4V, Done AUR9807DFGD A9807DFG Tape & Reel

5V, CV Mode AUR9807VIGD A9807VIG Tape & Reel

5V, Done AUR9807DIGD A9807DIG Tape & Reel

6V, CV Mode AUR9807VSGD A9807VSG Tape & Reel

6V, Done AUR9807DSGD A9807DSG Tape & Reel

D: QFN-4.5x3.5-20

G: Green

Packing

Type

BCD Semiconductor's Pb-free products, as designated with "G" in the part number, are RoHS compliant and
green.

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Input Voltage VIN -0.3 to 18 V

V

, VCE, V

BAT

, V

V

MODE

, V

V

ISET2

STAT1

Input Voltage

V

V

Input Current IIN 3.5 A

I

Output Current

I

Output Source Current
(In Regulation at 3.3V V

REF

)

Output Sink Current I

/PG

, I

I

STAT1

Thermal Resistance
(Junction to Ambient)

Storage Temperature T

Junction Temperature TJ -40 to 150 °C

Lead Temperature
(Soldering, 10 Seconds)

ESD (Human Body Model) V

ESD (Machine Model) VMM 200 V

, V

APM

, V

OUT

, V

V

TS

-0.3 to V

REF

-0.3 to V

TMR

4 A

OUT

-4 to 1.5 A

BAT

30 mA

REF

, I

θ

JA

-65 to 150 °C

STG

,

/PG

,

ISET1

,

STAT2

15 mA

STAT2

-0.3 to 7 V

+0.3 V

OUT

+0.3 V

OUT

52 °C/W

300 °C

2000 V

HBM

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter Symbol Min Max Unit

AUR9807DSGD, AUR9807VSGD 4.35 6.3 V

Supply Voltage

AUR9807DFGD,AUR9807VFGD,
AUR9807DIGD, AUR9807VIGD

V

IN

4.35 5.5 V

Input Current IIN 2 A

Operating Junction Temperature Range TOP -40 125 °C

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

6

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Electrical Characteristics

TA=25oC, VIN is within the recommended range, unless otherwise specified.

Parameter Symbol Test Condition Min Typ Max Unit

Active Supply Current I

Sleep Mode Current into
BAT Pin

Input Pin Standby
Current

BAT Pin Standby Current I

Charge Done Current,
BAT

I

I

IN(STDBY)

BAT(STDBY)

I

BAT(TERM)

Q1,Q2 DROP-OUT VOLTAGE

IN to OUT Dropout
Voltage
BAT to OUT Dropout
Voltage

V

DO(IN-OUT)

V

DO(BAT-OUT)VBAT

VOLTAGE REGULATION

Regulation V
9807VF 9807DF
Regulation V
9807VI 9807DI
Regulation V
9807VS 9807DS

OUT

OUT

OUT

V

V

V

APM REGULATION

VIN>4.35V 1.1 2 mA

IN(SPLY)

BAT(SLP)

V

IN<VBAT

2.6V<V

,

BAT<VBAT(REG)

2.5 5 µA
No load at OUT pin
V

<6V, Total current flow

IN

into IN pin with CE pin

200 µA
low; no load
Total current flow into
BAT pin with input source

45 65 µA
present and CE pin low
Current flows into BAT
pin after the termination of

1 5 µA
the charging process

MODE=High , IIN=1A 300 475 mV

OUT(REG)

OUT(REG)

OUT(REG)

> 4V , I

VIN>4.4V+V

VIN>5V+V

VIN>6V+V

=1A 40 100 mV

BAT

DO(IN-OUT)

DO(IN-OUT)

DO(IN-OUT)

4.4 4.5 V

4.9 5.1 V

6 6.3 V

APM Set Point V

APM Current Source I

APM-SET

APM-SET

APM Scale Factor SF V

V

APM-SET<VOUT

2.6 3.8 V

Input present 95 100 105 µA

APM-REG=VAPM-SET

x SF 1.139 1.15 1.162

BATTERY SUPPLEMENT MODE

V

<

Run Battery Supplement
Mode

Escape Battery
Supplement Mode

V

V

BSUP1

BSUP2

V

V

BAT

BAT

>2V

>2V

OUT

V

BAT

60mV

–

V

V

>

OUT

–

V

BAT

20mV

V

CHARGING-PRECHARGE

Precharge to Fast-charge
Transition Voltage

Precharge Current Range I

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

V

Voltage on BAT 2.9 3 3.1 V

LOWV

10 150 mA

PRECHG

7

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Electrical Characteristics (Continued)

TA=25oC, VIN is within the recommended range, unless otherwise specified.

Parameter Symbol Test Condition Min Typ Max Unit

Precharge Set Voltage V

De-glitch Time Between
Fast Charge and
Precharge Transition

225 250 275 mV

PRECHG

t

=100ns,

FAL L

10mV overdrive,

t

DGLF

decreasing below

V

BAT

22.5 ms

threshold

CHARGING-CURRENT REGULATION

Fast Charge Current
Range

BAT to OUT Pull-up R

Battery Charge Current
Set Voltage

(1)

Charge Current Set
Factor

V

I

V

CHG

PBAT

SET

BAT>VLOWV

V

<1V 1000 

BAT

Voltage on ISET1 2.4 2.5 2.6 V

100mA<I

K

SET

10mA<I

, Mode=High 100 1000 1500 mA

<1.5A 375 425 450

CHG

<100mA 300 450 600

CHG

USB MODE INPUT CURRENT LIMIT

ISET2=High 400 500

USB Input Current Range I

USB

mA

ISET2=Low 80 90 100

CHARGING VOLTAGE REGULATION

Battery-charge-voltage 4.2 V

Battery Charge Voltage
Regulation Accuracy

V

BAT(REG)

TA=25°C -0.5 0.5 %

-1 1 %

CHARGE TERMINATION DETECTION

Charge Done Detection
Current

Charge Done Set Voltage,
Measured on ISET1

I

TERM

V

TERM

V

BAT>VRCH

I

TERM

R

SET

V

BAT>VRCH

V

BAT>VRCH

,

=(K

SET

x V

TERM

)/

10 150 mA

, Mode=High 230 250 270

, Mode=Low 95 100 130

mV

TEMPERATURE SENSE COMPARATORS

High Voltage, Low
Temperature Threshold
Low Voltage , High
Temperature Threshold
Current Source for
Temperature Sense

Temp fault at VTS>V

V

LTF

Temp fault at VTS<V

V

HTF

95 100 105 µA

I

TS

2.5 V

LTF

0.5 V

HTF

BATTERY RECHARGE THRESHOLD

Recharge Threshold
Voltage

V

RCH

(1) For half-charge rate, V

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

is 1.25V.

SET

8

V

-0.125

BAT(RE

G)

V

BAT(RE

-0.1

G)

V

BAT(RE

G)

-0.075

V

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Electrical Characteristics (Continued)

TA=25oC, VIN is within the recommended range, unless otherwise specified.

Parameter Symbol Test Condition Min Typ Max Unit

STAT1, STAT2, AND /PG

I

=5mA, requiring an

Low-level Output
Saturation Voltage

Input Leakage Current I

V

OL

LKG

ISET2, CE

t

CE Pin Hold-off Time

CE-HLDOF

F

Low-level Input Voltage VIL 0 1.1

High-level Input Voltage VIH 1.5

CE Pin
Low-level Input Current
CE Pin
High-level Input Current
ISET2 Pin
Low-level Input Current
ISET2 Pin
High-level Input Current

I

IL1

I

IH1

I

IL2

I

IH2

MODE

Mode Pin
Low-level Input Voltage

Mode Pin
High-level Input Voltage
Mode Pin
Low-level Input Current

V

IL

V

IH

I

IL

TIMERS

OL

external pull-up resistor>

0.25 V

1k

1 5 µA

CE fall low only 4 6 ms

V

-1

1

µA

V

V

=0.4V -20

ISET2

ISET2=VIN

40

Falling HiLow;
280k±10% applied when

0.975 1 1.025 V
low
Input R
hysteresis

sets external

MODE

VIL+

0.01

+

V

IL

0.024

V

-1 µA

Timer Set Factor K

External Resistor Limits R

Precharge Timer t

Timer Fault Recovery
Pull-up from OUT to BAT

Time Out Extension
Factor1

Time Out Extension
Factor2

t

TMR

TMR

PRECHG

R

FAULT

CHG=KTMR

30 100 k

1 k

x R

0.313 0.36 0.414 s/

TMR

0.115

t

x

CHG

0.125
x

t

CHG

The actual charge current less

K

EXT1

than 50% of maximum fast

2
charge current
The actual charge current less

K

EXT2

than 25% of maximum fast

4
charge current

0.135
x

t

CHG

s

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Electrical Characteristics (Continued)

TA=25oC, VIN is within the recommended range, unless otherwise specified.

Parameter Symbol Test Condition Min Typ Max Unit

CHARGER SLEEP THRESHOLDS

Sleep-mode Entry
Threshold
Sleep-mode Exit
Threshold

V

V

SLPENT

SLPEXIT

DE-GLITCH TIME

De-glitch Time for
Charge Done Detection,

18.75 ms

Temperature Fault,

t

DEG

Recharge and Sleep
Mode Detection

START-UP CONTROL BOOT-UP

Boot-up Time t

BOOT-UP

On the first application
of input low

SWITCHING POWER SOURCE TIMING

Switching Power Source
from Input to Battery

t

SW-BAT

When input applied.
Measure from: [/PG: Lo
 Hi to I

THERMAL SHUTDOWN REGULATION

>5 mA ]

IN

V

BAT

+0.195

120 150 180 ms

50 µs

V

BAT

+0.125

mV

Temperature Trip T

SHTDWN

Thermal Hysteresis TJ (Q1 and Q3 only) 25

Temperature Regulation
Limit

T

TJ (Q1 and Q3 only) 150

TJ (Q2) 110 130

J(REG)

°C

UVLO

Under-voltage Lockout V

Decreasing VIN 2.45 2.5 2.65 V

UVLO

Input power detected

Input Power Detection
Threshold

V

IN(DT)

when
V

IN>VBAT

=3.6V

V

BAT

: 3.5V  4V

V

IN

+ V

IN(DT)

55 80 130 mV

Hysteresis 27 mV

VREF OUTPUT

Output Regulation
Voltage

V

REF

Active only if ADP or
USB is present

3.3 V

Regulation Accuracy -5 +5 %

Output Current I

On Resistance R

Output Capacitance C

20 mA

REF

OUT to VREF 50 

DS(ON)

1 µF

OUT

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Electrical Characteristics (Continued)

TA=25oC, VIN is within the recommended range, unless otherwise specified.

SHORT CIRCUIT PROTECTION

Pull-up source from
Short-circuit Recovery
Between BAT to OUT

IN to OUT Short-circuit
Protection

I

R

OSH1

SHAC

Output Short-circuit
Detection Threshold,

V

OUT(SC1)

Power-on
Output Short-circuit
Detection Threshold,
Supplement mode
(V

BAT

– V

OUT

)>V

OUT(SC2)

V

OUT(SC2)

Indicates Short-circuit
Deglitch Time,
Supplement Mode Short

t

DGL(SC2)

Circuit
Maximum Short-current
for V

BAT>VOUT

I

SHORT

(2) For short current>I

, short-protection may not work due to avalanche breakdown phenomenon.

SHORT

BAT to OUT for

short-circuit recovery

V

OUT<VBAT

V

V

<1V 500 

OUT

V

IN>VUVLO

V

IN>VBAT

>2.5V 160 200 240 mV

BAT

–200mV

and

+ V

IN(DT)

10 mA

0.9 1 1.1 V

512 µs

(2)

V

>2.5V 9 A

BAT

Typical Performance Characteristics

Figure 4. Output Voltage vs. Output Current Figure 5. Output Voltage vs. Charge Current

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Typical Performance Characteristics (Continued)

V

OUT

2V/div

V

2V/div

I

CHG

0.5A/div

IN

Figure 6. Charge Current vs. Input Voltage Figure 7. Power On

V

2V/div

V

2V/div

I

CHG

1A/div

V

SYSOFF

2V/div

OUT

IN

V

2V/div

V

OUT

2V/div

I

CHG

0.5A/div

V

MODE

2V/div

IN

Time 1ms/div

Figure 8. SYSOFF Floating Figure 9. MODE Pin Pull Low

Time 20ms/div

Time 200µs/div

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Typical Performance Characteristics (Continued)

V

IN

2V/div

V

OUT

2V/div

I

CHG

0.5A/div

V

2V/div

V

OUT

2V/div

I

CHG

0.5A/div

IN

V

V

2V/div

ISET2

ISET2

2V/div

Time 40µs/div Time 400µs/div

Figure 10. ISET2 Pin Pull High Figure 11. ISET2 Pin Pull Low

V

IN

2V/div

V

OUT

2V/div

I

CHG

0.5A/div

V

MODE

2V/div

Time 40µs/div

Figure 12. MODE Pin Pull High

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Power Flow

The AUR9807 selects the power source automatically.
In the absence of the input source (AC adapter or USB),
the battery is chosen to power the system. Under this
circumstance, the AUR9807 consumes less than 5µ
Ampere; the power path resistance from the battery to
the system is only 40m
efficiency and elongate the battery discharge time. With
this stringent sleep current budget (<5µA), the
AUR9807 is still able to detect an output short
condition and cuts off the power path between the
battery and the system under short condition.

With the input power present, the MODE pin sets the
AUR9807 in adapter mode or USB mode. In adapter
mode, the AUR9807 does not limit the total current

MODE Pin

Level

Low

(3)

; all these guarantee a high

Power Source Selection and Charge Current Setting

AC Adapter

Yes USB ISET1, limitation depends on ISET2 setting

No Battery N/A

Loading Power

Source

directly, current limiting phenomenon occurs through
Adaptive Power Management in response to the output
voltage drop. The resistor connected to ISET1 pin sets
the maximum charging current. This maximum
charging current can be halved by pulling down the
ISET2 pin. In USB mode, the AUR9807 will limit the
total current within 450mA (ISET2=High) or 90mA
(ISET2=Low). The maximum charging current is still
set by the resistor connected to ISET1 pin; however,
because of this current limiting feature, the actual
charging current is usually less than 450mA (or 90mA).

(3) Q2 design value is 40m.

Charge Current Setting

High

Yes AC Adapter ISET1, half charging rate by setting ISET2 to low

No Battery N/A

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

14

×

×

×

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Charge Function Descriptions

Charge Flow

Maximum Charging Current Setting

MODE=High ISET2=High

MODE=High ISET2=Low

MODE=Low

ISET2=High/L

ow

I

I

I

CHG

CHG

CHG

Pre-charge and Charge Done

Current Setting

I

maxCHG,

I

KV

=

SETSET

R

SET

2.5V,

=

maxSET,

PRECHG

I

TERM

=

I

=

10

I

I

KV

=

SETSET

R

SET

1.25V,

=

maxSET,

PRECHG

I

TERM

=

I

=

20

I

I

KV

=

SETSET

R

SET

2.5V,

=

maxSET,

PRECHG

I

TERM

=

I

=

25

10

maxCHG,

20

maxCHG,

10

maxCHG,

;

ModeAC;

maxCHG,

ModeAC;

maxCHG,

ModeUSB;

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

15

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Charge Function Descriptions (Continued)

The maximum charging current, the pre-charge
current and charge done current setting are given in
the above table. The charging process begins with a
pre-charge phase; when the battery voltage reaches
the pre-charge threshold V

, the charger enters

LOWV

the constant current mode. At this stage, the charger
tries to charge the battery with the maximum
charging current (a constant); however, the actual
charging current may be lower due to Active Power
Management activated by large system loading or
insufficient input current capability. The thermal
fold-back mechanism also reduces the actual
charging current when the junction temperature is
over 110°C. The battery voltage rises gradually with
the constant current entering the battery.

When the battery voltage reaches V

BAT(REG)

, the
charger enters the constant voltage mode. At this
stage, the charger keeps the battery voltage at
V

BAT(REG)

with a decreasing charging current. When

the charging current drops below the charge done

current setting, nominally the charging process is
complete (this can be observed from the external
indicator). Depending on different versions, after the
charge done status indicated, the charger will stop
providing charging current completely or stay in
constant voltage mode till time out. When the battery
voltage drops below the recharge threshold, a new
charge cycle begins.

Example:

With a R

=1k, the maximum charging current is

SET

about 1A for ISET2=High and 0.5A for ISET2=Low.
The pre-charge current I

is 100mA. The charge

PRECHG

done current setting is 100mA for AC mode and
40mA for USB mode. Note the absolute values of
pre-charge current and charge done current setting do
not vary with ISET2.

Power Source Selecting

OUT

REF

i. V
ii. V
iii. V

IN<VBAT

BAT<VIN<VOUT(REG)

OUT(REG) +VDO(IN-OUT)<VIN

iv. 6V<V

: V

OUT=VBAT–VDO(BAT-OUT)

: V

: V

IN

OUT =VBAT–VDO(BAT-OUT)

OUT=VIN–VDO(IN-OUT)

<6V: V

OUT=VOUT(REG)

The AUR9807 selects power source automatically
depending on the voltage present at the input. When
V

is lower than V

IN

power the system. The output voltage V
V

DO(BAT-OUT)

than V

. When the input voltage V

and lower than 6V, the input source is used

BAT

, the battery is responsible to

BAT

is V

OUT

is higher

IN

BAT

to supply the system power; the output voltage
depends on V

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

. When V

IN

is lower than V

IN

OUT(REG)

the output voltage V
is high enough, which means that VIN>(V

–

V

DO(IN-OUT)

V

OUT(REG)

), the output voltage is regulated at

. When the input voltage V
6V, the current path between IN and OUT is cut off to
protect the chip; AUR9807 therefore selects the
Battery as the power source; the output voltage V

,

is then V

16

BAT–VDO(BAT-OUT)

OUT

is VIN–V

.

DO(IN-OUT)

is higher than

IN

; when V

OUT(REG)

IN

+

OUT

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Charge Function Descriptions (Continued)

Active Power Management (APM)

 AC MODE (MODE=HIGH)
i. V

APM-REG<VOUT

by R

SET

ii. V

BAT<VOUT<VAPM-REG

–I

OUT

max

iii. V

OUT<VBAT

 USB 500 MODE (MODE=LOW ,

ISET2=HIGH)

i. V

APM-REG<VOUT

by R

SET

ii. V

BAT<VOUT<VAPM-REG

450mA – I

iii. V

OUT

OUT<VBAT

 USB 100 MODE (MODE=LOW ,

ISET2=LOW)

i. V

APM-REG<VOUT

by R

SET

ii. V

BAT<VOUT<VAPM-REG

90mA–I

iii. V

OUT

OUT<VBAT

The active power management feature adjusts the
charging current to resist the output voltage drop due to
heavy system loading or insufficient input driving
capability. In the extreme situation, the charging current
flow would be reversed (the battery helps to supply the
system power). The active power management
regulation voltage V

APM-REG

= I

APM-SET×RAPM

V

: Normal Mode; I

: APM mode ; I

: BAT supply mode

: Normal Mode; I

: APM mode; I

: BAT supply mode

: Normal Mode; I

: APM mode; I

: BAT supply mode

is given by:

APM-REG

× SF

AUR9807

(4)

determined

CHG

CHG

determined

CHG

CHG

determined

CHG

CHG

=

=

= I

supply

When the output voltage is higher than V
input source is capable of providing the charging
current (set by R

) and output current (determined by

SET

system loading) simultaneously. When the output
voltage goes down and reaches V

APM-REG

increasing loading, AUR9807 starts to reduce the
charging current and tries to keep the output voltage at
V

. Because AUR9807 uses the remaining

APM-REG

available current to charge the battery, the charging
current can be estimated as I
the I

supply max

is determined by the driving capability of

supply max

– I

OUT

the AC adapter and AUR9807 itself (usually the
limiting factor is the AUR9807, and I
2A). The I
USB mode (I
and I

supply max

is determined by the ISET2 setting in

supply max

is about 450mA with ISET2 high,

supply max

is about 90mA with ISET2 low).

supply max

When the loading current keeps increasing and exceeds
I

supply max

voltage dropping below V

, the AUR9807 can not prevent the output

even the charging

APM-REG

current is reduced to zero. When the output voltage
drops below the battery voltage, the battery helps to
supply the loading current and keeps the output voltage
roughly at V

I

= I

OUT

supply max+IBAT

(4) R

APM

R

APM

. At this situation, we have:

BAT

(5)

<38k: V

>41k: The V

APM-REG=IAPM-SET×RAPM

APM-REG

is set to a

predetermined fixed value (4.26V)

(5) I

BAT

=(V

BAT–VOUT

) / (40m Power Path

Resistance)

Battery Temperature Protection

BAT

1µF

Li Battery

APM-REG

due to an

. In AC mode,

is about

×SF

, the

100µA

LOGIC UNIT

V

HTF

NTC

TS

V

LTF

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

17

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Charge Function Descriptions (Continued)

The AUR9807 interrupts the charging process when the
battery temperature is out of normal range. It provides a
100µA sensing current to the negative-temperature
coefficient resistor (on the battery side) through the TS
pin. The battery protection is achieved by constantly
monitoring the voltage at the TS pin. When this voltage
is higher than V
V

(nominally 0.5V), an under-temperature or

HTF

(nominally 2.5V) or lower than

LTF

over-temperature condition is detected. For an usual
103AT-type NTC resistor, the corresponding
temperature range is between 0°C and 45°C. The
normal battery temperature range can be modified by
adjusting the NTC resistor or by adding extra resistor
network between the TS pin and the
negative-temperature coefficient resistor. The charging
process would resume after the battery temperature
goes back within the normal range.

Charge Timeout Setting

The charge timeout setting is programmed by the
resistor R
pin. The timeout setting is given by:

t

= K

CHG

A suggested 36k R
because the nominal value of K
actual charging process, the charging duration is
elongated if the charging current can not reach the
maximum current setting (again this relates to system
loading and environment temperature); therefore, it is
possible that the charging process is still on progress
while the 3.6 hrs timeout limit has been reached. To
circumvent this problem, the actual charging current is
monitored and the clock rate of the timer counter is
halved if the charging current is less than 50% of the
maximum fast charging current. This is equivalent to
modify the timeout setting temporarily by the following
equation:

t

= K

CHG

If the actual charging current is less than one fourth the
maximum fast charging current, the time out counter
rate is reduced to 25%. The temporary timeout setting
is given by:

t

= K

CHG

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

connected between the TMR and ground

TMR

× R

x K

TMR

TMR

gives a 3.6 hrs timeout setting

TMR

is 0.36 sec/. In the

TMR

× R

, where K

TMR

EXT1

=2

TMR

EXT1

EXT2

x K

TMR

× R

, where K

TMR

EXT2

=4

Once the abnormal condition is removed (high
temperature or heavy loading), the charging current
resumes the maximum values (set by R

), and the

SET

time out counter will operate in normal rate.

Charge Status Indicator

Status STAT1 STAT2
Pre-charge ON ON
Constant current and constant
voltage charge

ON OFF

Charge done OFF ON
Fault condition (time out,
sleep mode, or OTP)

OFF OFF

The open drain pins STAT1 and STAT2 provides the
information about the charger status when the CE pin
(chip enable) is set to high. The various charger status
and the corresponding STAT1 and STAT2 levels are
given in the above Table. Connect these pins to the host
processor or LEDS to indicate the charger status.

Short Circuit Protection

AUR9807 provides short circuit protection for both the
input and the battery. When V

is larger than V

IN

BAT

, AC
adapter (or USB port) is chosen as the power source. If
the output voltage is lower than 1V (V
than t

, a short circuit condition is detected; the

DGL(SC)

OUT(SC1)

) for more

power path between the input and the output will be cut
off. The charging process will be interrupted. A 500
resistor is used to pull up the output voltage; if the load
at the output is removed, the output voltage can be
pulled up and the short circuit condition is dissolved.

Similarly, when the battery is chosen as the power
source, an output voltage lower than the battery voltage
by 200mV (V

OUT(SC2)

) longer than t

DGL(SC)

will trigger
the short circuit protection mechanism (this
corresponds to a 5A loading current). A 10mA current
source is used to pull up the output and detect the
removal of the short condition. The power consumption
is less than 5µA under the battery supply mode;
however, AUR9807 is still able to monitor the output
voltage and detect a short circuit condition with this
limiting current budget.

SYSOFF Function

The SYSOFF function is used to cut off the power path
between the battery and the output. This means the

18

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Charge Function Descriptions (Continued)

charger function can be disabled by pulling up the
SYSOFF pin; in this mode, the AUR9807 is almost a
regulator to power the system. Because the power path
is cut off, the output voltage will drop to zero when the
input source is removed, the battery will not be used to
power the system. The SYSOFF pin is pulled high
internally; therefore, this pin should be pulled to ground
for normal operation.

Recharge Process and Timer Fault
Elimination

If timeout occurs and the battery voltage is higher
than the recharge threshold, the charger will stay in
the charge done mode until the battery voltage drops
below the recharge threshold. Once the battery
voltage drops below the recharge threshold, a new

charge cycle starts.

If timeout occurs and the battery voltage is lower
than the recharge threshold, the charger will indicate
a fault condition and an internal resistor between
output and battery will try to pull up the battery
voltage. If the internal resistor is unable to pull up the
battery voltage to the recharge threshold, the charger
will stay in fault condition. Once the battery voltage
is higher than the recharge threshold, the charger
removes the pull-up resistor, leaves the fault
condition and stay in the charge done mode
temporarily. The charger then waits the battery
voltage to drop below the recharge threshold and
starts a new charge cycle.

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

19

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

PC Board Layout Considerations

It is important to pay special attention to the PCB
layout. The following provides some guidelines.

1. To obtain optimal performance, the decoupling
capacitor from the input terminal to GND and the
output filter capacitor from OUT to GND should be
placed as close as possible to the AUR9807, with
short trace runs to both signal and GND pins.

2. All low-current GND connections should be kept

V

OUT

H

V

+5V

OUT

JP5

3
2
1

separate from the high-current charge or discharge
paths from the battery. Use a single-point ground
technique incorporating both the small signal
ground path and the power ground path.

3. The high-current charge paths into IN and from the
BAT and OUT pins must be sized appropriately for
the maximum charge current in order to avoid
voltage drops in these traces.

STAT1

LED1 - Green

STAT2

LED2 - Red

R1 1k

R2 1k

H

TP4

TP3

R3 1k

C4

10µF/16V

R13
/opt

R14
30k

R11
27k

R8
1k

R10
10k

C5
/opt

R15

50k

R12

20k

R9
10k

V

OUT

/PG

R16
1k

V

V

IN

V

BAT

IN

C6
/opt

C7
/opt

R4

100k

D1

5.1V ZENER

L

3
2

ISET2

1

H

JP1

C2

10µF/35V

C3

1µF

R5
100k

3
2
1

JP2

L

MODE

H

1
2
3
4
5
6
7
8

10

TP1

ISET1

R6
100k

C1

0.1µF

U1

VREF
STAT1
STAT2

IN

BAT
BAT
ISET2
MODE

ISET1

AUR9807

3

L

2

CE

1

H

JP3

GND
GND

/PG
OUT
OUT
OUT
TMR
APM

SYSOFF

L

SYS_OFF

H

LED3 - Green

20
19
18
17
16
15
14
13
129

TSCE

11

3
2
1

JP4

TP2

R7
100k

TMR

APM

TS

H

Figure 13. The Evaluation Board Schematic

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

20

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

PC Board Layout Considerations (Continued)

Figure 14. Top Side View of The Evaluation Board

Figure 15. Bottom Side View of The Evaluation Board

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

21

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Typical Application

Figure 16. Typical Application of AUR9807

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

22

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Mechanical Dimensions

QFN-4.5

×3.5-20

Unit: mm(inch)

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

23

BCD Semiconductor Manufacturing Limited

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