AS3020_技术文档

AS3020

800mA Linear Battery Charger

In SOT23-5LPackage

DESCRIPTION

FEATURES

AS3020 is a complete constant - current and

constant-voltage linear charger for single cell

lithium-ion and Lithium-Polymer batteries. Its

SOT23-5L Package and low external component

count make AS3020 ideally suited for portable

applications. Furthermore the AS3020 is specifically

designed to work within USB power specification. At

the same time AS3020 can also be used in the

standalone lithium-ion and Lithium-polymer battery

charger.

Programmable Charge Current Up to 800mA

No MOSFET, Sense Resistor or Blocking Diode

Required

Constant-Current/Constant-Voltage Operation

with Thermal Protection to Maximize Charge

Rate without Risk of Overheating

Charges Single Cell Li-Ion Batteries Directly

from USB Port

Press 4.2V Charge Voltage with ± 1% Accuracy

25μA. Supply Current in Shutdown

2.9V Trickle Charge Threshold

No external sense resistor is needed and no

blocking diode is required due to the internal

MOSFET architecture. Thermal feedback regulates

the charge current to limit the die temperature during

high power operation or high ambient temperature.

The charge voltage is fixed at 4.2V and the charge

current can be programmed externally with a single

resistor. The A3020 automatically terminates the

charge cycle when the charge current drops to

1/10th the programmed value after the final float

voltage is reached.

Available Without Trickle Charge

Soft-Start Limits Inrush Current

Available in SOT23-5L Package

APPLICATIONS

Cellular Telephones,

PDA’s, MP3 Players

Charging Docks and Cradles

Bluetooth Applications

“ANI” and “ANISEM” is Trademarks of ANISEM Semiconductor, Inc.

When the input supply (wall adapter or USB supply)

is removed the AS3020 automatically enters a low

current stagedropping the battery drain current to

less than 2μA. The AS3020 can be put into

shutdown mode reducing the supply current to 25μA.

Other features include charge current monitor,

undervoltage lockout, automatic recharge and a

status pin to indicate termination and the presence of

an input voltage.

TYPICAL APPLICATION

VIN

4.5V to 6.5V

4

VCC

LED

AS3020

3

BAT

330

4.2V

Li-lon

Batery

5

ORDER INFORMATION

PROG

1

Part Number

Operating Temperature

CHRG

1.65K

AS3020EGT

-40°C to 85°C

GND

2

EVALUATION BOARD

Board Number

Dimensions

50^mmX x 50^mmY x 1.4^mm

Z

EV3020EG-00A

AS3020 Rev.1.6

10/25/2009

www.anisem.com

1

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AS3020 – 800mA LINEAR BATTERY CHARGER

PACKAGE REFERENCE

ABSOLUTE MAXIMUM RATINGS⁽¹⁾

VCC Supply Voltage………………..……………7V

PROG Voltage ……………...………….VCC +0.3V

PROG Current…………………………….…800uA

CHRG Voltage ………………….………………..7V

BAT Voltage ……………………..………………..7V

BAT Current…………………………………800mA

Junction Temperature ……………….……….. 125°C

Lead Temperature (Soldering, 10sec.) …..…+300°C

Storage Temperature Range …….... -65℃ to 150°C

Recommended Operating Conditions⁽²⁾

Supply Voltage V_IN……………….………-0.3V to 7V

Operating Temperature ……………. -40°C to 85°C

Part Number*

Package

Operating Temp

AS3020EGT

SOT23-5L

-40°C to 85°C

NOTEs:

1)

2)

3)

Exceeding these ratings may damage the device.

The device is not guaranteed to function outside of its operating conditions.

Measure on approximately 1’’square of 1 oz copper.

ELECTRICAL CHARACTERISTICS

V_IN=5V, T_A= 25°C, Unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

Supply Voltage

4.25

6.5

2000

500

V

Charge Mode, R_PROG=9K

Standby Mode

300

200

uA

Supply Current

Shutdown Mode(R_PROGunconnected,

V_CC<V_BATor V_CC<V_UV

I_BAT=40mA

25

50

uA

Regulated Output Voltage

4.158

93

4.2

100

500

-2.5

1

4.242

107

535

-6

V

R_PROG=9K, Current Mode

R_PROG=1.8K, Current Mode

Standby Mode, V_BAT=4.2V

Shutdown Mode

mA

uA

mA

V

465

0

BAT Current

2

Sleep Mode, VCC=0V

V_BAT<V_TRIK1, R_PROG=1.8K

R_PROG=9K, V_BATRising

R_PROG=9K

1

2

Trickle Charge Current

Trickle Charge Threshold

Trickle Voltage Hysteresis

VCC UVLO Threshold

VCC UVLO Hysteresis

20

45

70

2.8

60

2.9

80

3.0

110

3.93

300

1.30

1.1

140

50

mV

V

From Vcc Low to High

3.7

150

1.15

0.9

70

3.8

200

1.21

1.0

100

30

mV

V

PROG Pin Rising

Manual Shutdown Threshold

V_CC-V_BATLockout Threshold

PROG Pin Falling

V

VCC from Low to High

VCC from High to Low

mV

5

AS3020 Rev.1.6

10/25/2009

www.anisem.com

2

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AS3020 – 800mA LINEAR BATTERY CHARGER

ELECTRICAL CHARACTERISTICS

V_IN=5V, T_A= 25°C, Unless otherwise noted.

PARAMETER

CONDITIONS

_PROG=9K

MIN

TYP

MAX UNITS

R

0.085 0.10 0.115 mA/mA

C/10 Termination Current

Threshold

R_PROG=1.8K

PROG Pin Voltage

R_PROG=9K, Current Mode

V_CHRG=5V

0.93

8

1.0

20

1.07

35

V

uA

V

CHRG Pull-down Current

CHRG Output Low Voltage

Recharge Battery Threshold

I_CHRG=5mA

0.35

100

0.6

200

V_FLOAT-V_RECHRG

mV

PIN FUNCTIONS

PIN NUMBER

PIN NAME FUNCTION

Open-Drain Charge Status Output. When the battery is charging. The CHRG Pin is

pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a

weak pull-down of approximately 20uA is connected to the CHRG pin, indicating an “AC

Present” condition.

1

CHRG

Ground.

2

3

GND

BAT

Charge Current Output. Provides charge current to the3 battery and regulates the final

float voltage to 4.2V.

Input Supply Voltage. Provides power to the charger. VCC can range from 4.25 to 6.5

and should be bypassed with at least a 1uF capacitor.

Charge Current Program. Charge current Monitor and Shutdown Pin.

4

5

VCC

PROG

AS3020 Rev.1.6

10/25/2009

www.anisem.com

3

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AS3020 – 800mA LINEAR BATTERY CHARGER

FUNCTION BLOCK DIAGRAM

AS3020 Rev.1.6

10/25/2009

www.anisem.com

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4

AS3020 – 800mA LINEAR BATTERY CHARGER

The charge current out of the BAT pin can be

determined at any time by monitoring the PROG pin

voltage using the following equation:

OPERATION

The AS3020 is a single cell lithium-lon battery

charger using a constant-current/constant-voltage

algorithm. It can deliver up to 800mA of charger

current(using a good thermal PCB layout) with a final

float voltage accuracy of ± 1%. The AS3020

includes an internal P-MOSFET and thermal

regulation circuitry. No blocking diode or external

current sense resistor is required; thus, the basic

charger circuit requires only two external

components. Furthermore, the AS3020 is capable of

operating from a USB power source.

V^PROG

I^BAT=

* 900

RPROG

CHARGE TERMINATION

A charge cycle is terminated when the charge

current falls to 1/10^ththe programmed value after the

final float voltage is reached. This condition is

detected by using an internal, filtered comparator to

monitor the PROG pin. When the PROG pin voltage

falls below 100mV for longer than t_TERM(typically

1ms), charging is terminated. The charge current is

latched off and the AS3020 enters standby mode,

where the input supply current drops to 200mA (note:

C/10 termination is disabled in trickle charging and

thermal limiting modes).When charging, transient

loads on the BAT pin can cause the PROG pin to fall

below 100mV for short periods to 1/10^ththe

programmed value. The 1ms filter time(t_TERM) on the

termination comparator ensures that transient loads

of this nature do not result in premature charge cycle

termination. Once the average charge current drops

below 1/10^ththe programmed value, the AS3020

terminates the charge cycle and ceases to provide

any current through the BAT pin. In this state, all

loads on the BAT pin must be supplied by the battery.

The AS3020 constantly monitors the BAT pin voltage

in standby mode. If this voltage drops below the

4.05V recharge threshold, another charge cycle

begins and current is once again supplied to the

battery.

NORMAL CHARGER CYCLE

A charge cycle begins when the voltage at the VCC

pin rises above the UVLO threshold level and a 1%

program resistor is connected from the PROG pin to

ground or when a battery is connected to the charger

output. If the BAT pin is less than 2.8V, the charger

enters constant-current is supplied to the battery.

When the BAT pin approaches the final float

voltage(4.2V), the AS3020 enters constant-voltage

mode and the charge current begins to decrease.

When the charge current drops to 1/10 of the

programmed value, the charge cycle ends.

PROGRAMMING CHARGE CURRENT

The charge current is programmed using a single

resistor from the PROG pin to ground. The battery

charge current is 1100 times the current out of the

PROG pin. The program resistor and the charge

current are calculated using the following equations:

900V

I^CHG

900V

R^PROG=

, ICHG=

R^PROG

AS3020 Rev.1.6

10/25/2009

www.anisem.com

ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

5

AS3020 – 800mA LINEAR BATTERY CHARGER

UNDERVOLTAGE LOCKOUT(UVLO)

OPERATION(Continued)

To manually restart a charge cycle when in standby

mode, the input voltage must be removed and

reapplied, or the charger must be shut down and

restarted using the PROG pin. Figure1 shows the

state diagram of a typical charge cycle.

An internal undervoltage lockout circuit monitors the

input voltage and keeps the charger in shutdown

mode until Vcc rises above the undervoltage lockout

threshold.The UVLO circuit has a built-in hysteresis

of 200mV. Furthermore, to protect against reverse

current in the power MOSFET, the UVLO circuit

keeps the charger in shutdown mode if Vcc falls to

with 30mV of the battery voltage. If the UVLO

comparator is tripped, the charger will not come out

of shutdown mode until Vcc rises 100mV above the

battery.

CHARGE STATUS INDICATOR(CHRG)

The charge status output has three different states:

strong pull-down 10mA, weak pull-down 20uA, and

high impedance. The strong pull-down state

indicates that the AS3020 is in a charge cycle. Once

the charge cycle has terminated,

The pin state is determined by undervoltage lockout

conditions. A weak pull-down indicates that VCC

meets the UVLO conditions and the AS3020 is ready

to charge. High impedance indicates that the

AS3020 is in undervoltage lockout mode: either Vcc

is less than 100mV above the BAT pin voltage or

insufficient voltage is applied to the Vcc pin.

THERMAL LIMITING

An internal thermal feedback loop reduces the

programmed charge current if the die temperature

attempts to rise above

a

preset value of

approximately 120 ℃ . This feature protects the

AS3020 from excessive temperature and allows the

user to push the limits of the power handling

capability of a given circuit board without risk of

damaging the AS3020. The charge current can be

set according to typical(not worst-case) ambient

temperature with the assurance that the charger will

automatically reduce the current in worst-case

conditions.

Figure1. Status Diagram of A Typical Charge Cycle

AS3020 Rev.1.6

10/25/2009

www.anisem.com

ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

6

AS3020 – 800mA LINEAR BATTERY CHARGER

APPLICATION INFORMATION

STABILITY CONSIDERATIONS

POWER DISSIPATION

The conditions that cause the AS3020 to reduce

charge current through thermal feedback can be

approximated by considering the power dissipated in

the IC. Nearly all of this power dissipation is

generated by the internal MOSFET this is calculated

to be approximately:

The constant-voltage mode feedback loop is stable

without an output capacitor provided a battery is

connected to the charge output. With no battery

present, an output capacitor is recommended to

reduce ripple voltage. When using high value, low

ESR ceramic capacitors, it is recommended to add a

1Ω resistor in series with the capacitor. No series

resistor is needed if tantalum capacitors are used.

In constant-current mode, the PROG pin is in the

feedback loop, not the battery. The constant-current

mode stability is affected by the impedance at the

PROG pin. With no additional capacitance on the

PROG pin, the charger is stable with program

resistor values as high as 20k. However, additional

capacitance on this mode reduces the maximum

allowed program resistor. The pole frequency at the

PROG pin should be kept above 100kHz.

_PD=ꢀ_VCC-VBATꢁ_{* IBAT}

The approximate ambient temperature at which the

thermal feedback begins to protect the IC is

TA=120ꢂ- PD*θJA

_TA=120ꢂ-ꢀ_{VCC- VBAT}ꢁ_*IBAT*θJA

THERMAL CONSIDERATIONS

Because of the small size of the thin SOT23 package,

it is very important to use a good thermal PC board

layout to maximize the available charge current. The

thermal path for the heat generated by the IC is from

the die to the cooper lead frame, through the

package leads, (especially the ground lead) to the

PC board copper. The PC board copper is the heat

sink. The footprint copper pads should be as wide as

possible and expand out to larger copper areas to

spread and dissipate the heat to the surrounding

ambient. Other heat sources on the board, not

related to the charger, must also be considered

when affect overall temperature rise and the

maximum charge current.

VCC BYPASS CAPACITOR

Many types of capacitors can be used for input

bypassing, however, caution must be exercised

when using multilayer ceramic capacitors. Because

of the self-resonant and high Q characteristics of

some types of ceramic capacitors, high voltage

transients can be generated under some start-up

conditions, such as connecting the charge input to a

live power source. Adding a 1.5Ω resistor in series

with a ceramic capacitor will minimize start-up

voltage transients.

AS3020 Rev.1.6

10/25/2009

www.anisem.com

7

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AS3020 – 800mA LINEAR BATTERY CHARGER

PACKAGE DESCRIPTION

Package

5-Lead Plastic SOT23-5L

2.70min

3.10max

5

4

NOTE:

1. DIMENSIONS ARE IN MILLIMETERS

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. JEDEC PACKAGE REFERENCE IS MO-193

1

2

3

0.95REF

0.30min

0.55max

10°max

1.90REF

0.45REF

0.6REF

AS3020 Rev.1.6

10/25/2009

www.anisem.com

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ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

AS3020 – 800mA LINEAR BATTERY CHARGER

ANISEM assume responsibility for use of any circuitry other than circuitry entirely embodied in an ANISEM product. No circuit patent licenses, copyrights,

mask work rights, or other intellectual property rights are implied. ANISEM reserves the right to make changes to their products or specifications or to

discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders,

that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order

acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. ANISEM warrants performance of its

semiconductor products to the specifications applicable at the time of sale in accordance with ANISEM’s standard warranty. Testing and other quality

control techniques are utilized to the extent ANISEM deems necessary to support this warranty. Specific testing of all parameters of each device is not

necessarily performed.

AS3020 Rev.1.6

10/25/2009

www.anisem.com

9

ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

EV3020-r1.0

800mA Linear Battery Charger

FEATURES

GENERAL DESCRIPTION

Programmable Charge Current Up to 800mA

AS3020 is a complete constant - current and

constant-voltage linear charger for single cell

lithium-ion and Lithium-Polymer batteries. Its

SOT23-5L Package and low external component count

make AS3020 ideally suited for portable applications.

Furthermore the AS3020 is specifically designed to

work within USB power specification. At the same time

AS3020 can also be used in the standalone lithium-ion

and Lithium-polymer battery charger.

No MOSFET, Sense Resistor or Blocking Diode

Required

Constant-Current/Constant-Voltage Operation

with Thermal Protection to Maximize Charge

Rate without Risk of Overheating

Charges Single Cell Li-Ion Batteries Directly

from USB Port

Press 4.2V Charge Voltage with ± 1% Accuracy

25μA. Supply Current in Shutdown

2.9V Trickle Charge Threshold

No external sense resistor is needed and no blocking

diode is required due to the internal MOSFET

architecture. Thermal feedback regulates the charge

current to limit the die temperature during high power

operation or high ambient temperature. The charge

voltage is fixed at 4.2V and the charge current can be

programmed externally with a single resistor. The

A3020 automatically terminates the charge cycle when

the charge current drops to 1/10th the programmed

value after the final float voltage is reached.

Available Without Trickle Charge

Soft-Start Limits Inrush Current

Available in SOT23-5L Package

APPLICATIONS

Cellular Telephones,

PDA’s, MP3 Players

Charging Docks and Cradles

Bluetooth Applications

When the input supply (wall adapter or USB supply) is

removedthe AS3020 automatically enters a low

current stage dropping the battery drain current to less

than 2μA. The AS3020 can be put into shutdown mode

reducing the supply current to 25μA.

TYPICAL APPLICATION

VIN

4.5V to 6.5V

Other features include charge current monitor,

undervoltage lockout, automatic recharge and a status

pin to indicate termination and the presence of an input

voltage.

4

VCC

LED

AS3020

3

BAT

330

4.2V

Li-lon

Batery

5

PROG

1

CHRG

1.65K

GND

2

600mA single cell Li-lon Charger

EV3020 Rev.10

7/25/2008

www.anisem.com

ANISEM Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

1


型号：	AS3020
厂家：	ETC
描述：	800mA Linear Battery Charger In SOT23-5LPackage 800毫安线性电池充电器SOT23-5LPackage 电池
文件：	总10页 (文件大小：305K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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