Diodes AUR9801C User Manual

Li-ion/Li Polymer Battery Charger AUR9801C

Data Sheet

General Description

The AUR9801C is a highly-integrated battery charger
for single-cell Li-ion or Li-polymer batteries capable
of operating with an input voltage reached 2.5V. It is
a complete charger device designed to work with an
USB port or 5V output AC adapter.

The AUR9801C operates with CC (constant current)
mode and CV (constant voltage) mode profiles. A
low-current preconditioning charge mode is also
provided as a trickle charging operation. The charge
current is programmable up to 1A with an external
resistor or a logic input. The charge voltage is 1%
accurate over the full application range.

When operating with a current-limited adapter, the
charger minimizes the thermal dissipation with
pulsed operations to prevent overheat conditions that
is commonly occurred with conventional linear
chargers. The AUR9801C reduces charge current for
thermal fold-back to ensure product safe operation.
The charger automatically re-charges the battery
when the battery voltage drops blow a recharge
threshold. The chip includes a safety timer for setting
the fast charge time limit in case of charging a dead
battery.

The AUR9801C is available in standard
WDFN-3×3-10 package.

WDFN-3

Features

•　 Complete Charger for Single-cell Li-ion
Batteries

•　 Charges from either AC Adapter or USB Port

•　 Integrated Power Pass Device with Current
Sensing

•　 No External Blocking Diode Required

•　 Pre-charge Condition with Safety Timing

•　 1% Charger Voltage Accuracy

•　 Programmable Current Limit up to 1A

•　 Sleep Mode for Power Saving

•　 Charge Current Thermal Fold-back

•　 Stand-alone or Integrated Charger

•　 Ambient Temperature Range: -40°C to 85°C

•　 Thermally-enhanced WDFN-3×3-10 Package

•　 Pb-free Plus Anneal Available (RoHS
Compliant)

Applications

• PDAs, Cell Phones and Smart Phones

• Digital Camera, MP3 and Handheld Gamming

• Portable Instruments Including Medical

Handhelds

• Self-charging Battery Packs

• Stand-alone Chargers or USB Port Chargers

×3-10

Figure 1. Package Type of AUR9801C

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Pin Configuration

D Package

（WDFN-3×3-10）

Figure 2. Pin Configuration of AUR9801C (Top View)

Pin Functions

Pin Number Pin Name Pin Type Function

1

2

3

4

5

6

7

8

9

10

VIN POWER Charger input supply voltage

TIME I

GND GROUND Ground pin

EN I

V2P8 O

IREF I

VSEN I

VBAT O Connection to the battery positive node

O

O

Active-low, open-drain output, capable of sinking 5mA
current
Open-drain pin to show charging and inhibit states,
capable of sinking 5mA current
Timing capacitor pin for connecting a capacitor to set
internal clocking and charger time reference

Chip enable control, high to activate the chip with internal
880KΩ pull-up resistor

2.8V reference voltage output, capable of driving up to
2mA
A resistor can be connected at the pin to set the charge
current
VSEN is the remote voltage sense pin. Connect to battery
positive node

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Functional Block Diagram

VIN

V2P8

IREF

VSEN

TIME

GND

1

7

8

9

4

5 6

Voltage

Current

Reference

VSEN

Block

CounterOSC

/

Figure 3. Functional Block Diagram of AUR9801C

Ordering Information

Circuit Type D: WDFN-3×3-10

Charge Voltage G: Green
C: 4.256V

Package

Temperature

Range

Current

Sense

Charger

Control

STATUS

AUR9801

Part Number Marking ID

FAULT

Temp

Control

10

VBAT

3

STATUS

2

FAULT

EN

Packing

Type

WDFN-3×3-10

-40 to 85°C

AUR9801CGD 9801C Type & Reel

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

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Input Voltage VIN -0.3 to 6.5 V

Enable Input Voltage VEN -0.3 to VIN+0.3 V

Output Voltage V

Other Pin Voltage -0.3 to VIN+0.3 V

Thermal Resistance (Simulation) θJA 45.13 °C/W

Operating Junction Temperature TJ 160 °C

Storage Temperature T

ESD Withstand Voltage
(Human Body Model)
ESD Withstand Voltage
(Machine Model)

-0.3 to VIN+0.3 V

BAT

-65 to 150 °C

STG

2000 V

V

HBM

200 V

V

MM

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

Supply Voltage VIN 4.6 5.5 V

Ambient Temperature Range TA -40 85

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°C

Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Electrical Characteristics

VIN=5V and TA=25°C for the typical values. The maximum and minimum values are over -40°C to 85°C
Ambient Temperature with a supply voltage in the range of 4.6V to 5.5V, unless otherwise specified.

Parameter Symbol Conditions Min Typ Max Units

Power-on Reset

VIN Rising Voltage 3.2 3.6 3.9 V

VIN Falling Voltage 2.25 2.5 2.7 V

Standby Current

VBAT Pin Sink Current I

STANDBY

VIN Pin Supply Current IIN

VIN-VBAT Offset Voltage

Offset Voltage VOS

Voltage Regulation

Output Voltage V

BAT

Dropout Voltage

Charge Current

Constant Charge Current I

Trickle Charge Current I

End-of-Charge Threshold I

CHG

TRICKLE

MIN

V2P8 Pin Output

V2P8 Pin Output Voltage V

2P8

Recharge Threshold

VIN floating or
EN=LOW
VBAT floating and
EN pulled low
VBAT floating and
EN floating

V

=4.2V,

BAT

=20mA,

I

BAT

use /STATUS pin

Tested at 50mA load,
5V input, and 25°C

=4.0V,

V

BAT

Charge Current=0.35A

=100kΩ,

R

IREF

=3.0V to 4.0V

V

BAT

=100kΩ,

R

IREF

V

BAT

R

IREF

=2.5V
=100kΩ

Load current less than
1mA

3.3

150

µA

µA

1 mA

45 80 100 mV

4.213 4.256 4.299 V

175 mV

760 800 840 mA

120 mA

70 80 90 mA

2.8 2.9 3.0 V

Recharge Threshold V

Recharge Threshold

V

Hysteresis

3.97 4.05 4.13 V

RECHG

RECHGHY

S

50 mV

Trickle Charge Threshold

Trickle Threshold
Voltage
Trickle Threshold
Hysteresis

2.7 2.8 2.9 V

V

MIN

V

50 100 150 mV

MINHYS

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Electrical Characteristics(Continued)

VIN=5V and TA=25°C for the typical values. The maximum and minimum values are over -40°C to 85°C
Ambient Temperature with a supply voltage in the range of 4.6V to 5.5V, unless otherwise specified.

Parameter Symbol Conditions Min Typ Max Units

Temperature Monitoring

Fold-back Threshold T

Oscillator

Oscillation Frequency f

Logic Input and Output

EN Pin Logic Input High 1.5 V

EN Pin Logic Input Low 0.8 V

EN Pin Internal Pull-up
Resistance
/STATUS, /FAULT
Output Voltage

107

FOLD

C

OSC

880

10mA Current 0.8 V

=15nF 305 333 370 Hz

TIME

°C

kΩ

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Typical Performance Characteristics

VIN=5V, TA=25°C, R

=100kΩ, V

IREF

=3.7V, unless otherwise specified.

BAT

1.0

0.9

0.8

0.7

0.6

Charge Current (A)

0.5

0.4

4.0 4.3 4.6 4.9 5.2 5.5 5.8 6.1

Input Voltage(V)

Figure 4. Charge Current vs. Input Voltage Figure 5. V2P8 Output Voltage vs. Input Voltage

2.90

2.88

2.86

2.84

V2P8 Output Voltage(V)

2.82

2.80
0246810

V2P8 Load Current (mA)

Figure 6. V2P8 Output Voltage vs. V2P8 Load Current

2.90

2.88

2.86

2.84

V2P8 Output Voltage(V)

2.82

2.80

3.5 4.0 4.5 5.0 5. 5 6.0 6.5

Input Voltage(V)

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Description of Charger Operation

The AUR9801C initiates a charger operation when
attached with a voltage source device or adaptor.
Figure 7 shows a typical charge profile when the
chip operates as a conventional linear charger with
a constant voltage source. The charging current is
set by an external resistor up to 1A. The target
charging voltage is 1% accurate over the specified
range.

The charger IC resets internal operational circuits
when internal Power-on-reset (POR) signal
becomes valid. V2P8 presents a voltage reference
output source capable of driving 2mA current after
POR. Other indication output pins are /STATUS

and /FAULT. The /STATUS is active low as an
open-drain type to indicate a charging cycle and
valid till the End-off-charge (EOC). The /FAULT
output signal becomes low to signal any occurred
fault conditions such as a charging time fault.

When charge with a current-limited adapter,
AUR9801C should be programmed with I
the upper limit of I
displayed in Figure 8 for minimizing power
dissipation during CC mode. The worst power
dissipation is often at the start of CV mode,
although thermal fold-back conditions could still
occur in this application case.

. A typical charge profile is

LIM

REF

over

Figure 7. A Typical Charge Profile as a Conventional Linear Charger

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Description of Charger Operation (Continued)

Figure 8. A Typical Charge Profile with a Current-limited Adapter

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Operation Overview

For linear charging case, the AUR9801C performs
either constant current (CC) and constant voltage
(CV) profiles. The charging current is set by an
external resistor up to 1A for package options. The
target charging voltage is 1% accurate over the
specified range. AUR9801C enters a trickle mode for
preconditioning operation each time when a charging
cycle starts till that the minimum charging voltage is
reached and verified in 15 clock cycles.

A thermal-feedback function offers thermal
protection during linear charging operations. When
the die temperature of AUR9801C goes up above 107
degree C, the charger automatically reduces the
charging current.

AUR9801C provides a TIMEOUT limit to prevent
charging a dead battery for extensive time.
Recharging is automatically started when battery
voltage drops to the recharging threshold point.
AUR9801C enters the shutdown mode in case no
voltage adapter is attached.

/STATUS /FAULT Condition

Power-down,

High High

Low High Charging

High Low

Charge current setting

5

⎛

10

⎜

0.8I

CHG

Charge timer setting

Time

×=

⎜

R

IREF

⎝

C

1

time

nF

14 ×=

charging is suspended

or interrupted

Bad battery

(Safety timer expired)

⎞
⎟

Where R

⎟
⎠

Where Time in Minutes

IREF

in KΩ

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Flow chart

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Data Sheet

K

K

Li-ion/Li Polymer Battery Charger AUR9801C

Application Circuit

10

F

10

F

IREF

EN

10

9

8

7

Li Battery

100K

1

F

VIN

+5V

1K 1K

LED1

LED2

15nF

1

VIN

2

FAULT

3

STATUS

4

TIME

56

GND

AUR9801C

VBAT

VSEN

V2P8

Figure 9. Typical Application Circuit

ADP

USB

680

1A

P_MOS

4.7K

1

VIN

VBAT

1A

10

F

1

680

BAT
16V

P_MOS

loading

4.7K

I

REF

KK

150200

•
=

150200

+

≈ 940mA

K

7.85

15nF

AUR9801C

4

TIME

GND

5

IREF

8

200K

150K

N_MOS

Figure 10. External Power Path Application Circuit

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Data Sheet

Li-ion/Li Polymer Battery Charger AUR9801C

Mechanical Dimensions

WDFN-3×3-10 Unit: mm(inch)

Aug. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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