Diodes APM8600 User Manual

APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

Description

The APM8600 is a linear Li-Ion charger for portable equipment that is optimized for small form-factor applications.

The charge algorithm in the APM8600 covers all the charge requirements for a single Li-Ion battery cell. Included is precharging for deeply discharged cells, constant current / constant voltage fast charging and a top-off feature to bring the cell safely to a full-charge level.

The battery is constantly monitored for overvoltage, charge time and cell temperature to ensure safe charging. A fault is triggered once the charge time exceeds a value that is programmable using a single capacitor and the temper ature measurement is achieved through a thermistor positioned close to the battery cell.

The APM8600 is packaged in U-DFN3030-14 package with a thermal pad.

Applications

NEW PRODUCT

• Handheld Consumer Devices

• Cell Phones, PDAs, MP3 Players

• Handheld Test Equipment

• Digital Still Cameras

• Multimedia players

Pin Assignments

Figure 1 Pin Out

Features

• Linear Lithium Ion / Lithium Polymer charging IC

• Supply input safe up to 28V

• Fast charging with maximum current of 1A

• Resistor-programmable charging current

• Resistor programmable end-of-charge

• Capacitor programmable charge timer

• Three charge indicator pins for a status display

• Thermal protection

• DFN3030-14: Available in “Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS

exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html

.

Typical Application Circuit

APM8600

Document number: DS35140 Rev. 1 - 2

Figure 2. Typical Application Circuit

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Pin Descriptions

APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

NEW PRODUCT

Name Pin # Description

BAT 1, 7

SETI 2

THM 3 Thermistor Input

GND 4 Ground Ground connection.

CT 5 Charge Timing

EN

10

POK

11

CHG

DC 12, 13 DC Input

FLT

EP Exposed Pad

NC 7,9 Not Connected Floating pins

DNC 6 Do Not Connect Must not connect

14

Connection to the

Charge Current

8

Charge Status

Battery

programming

Enable

(active-low)

Power OK

(active-low)

Fault Flag

(active-low)

The battery is charged via this pin and the BAT voltage is constantly monitored. Connect a bypass capacitor between BAT and GND (2.2µF).

The maximum charge current is programmed using a resistor from SETI to GND. This also determines the prequal current charging level and top-off threshold.

To monitor the battery temperature, connect a 10kΩ NTC thermistor. Place this thermistor as close as possible to the battery. Connect THM to GND if temperature measurement is not required.

Connecting a capacitor from CT to GND will set the time-outs for prequal, top-off and fast-charge. Connecting CT direct to GND disables these timers.

The charger is enabled when this input is low. To start the charger connect GND. Drive this input high to disable the charger.

When a valid input source is connected, this open-drain output is pulled low. Open-drain output that indicates the charging status. It is active only in the fast-

charge state and goes high-impedance when the charger is either disabled or in prequal or top-off mode.

DC supply input. The recommended input voltage is between 4.32V and 7V. This input is capable of withstanding up to 28V. Connect both DC pins together on the PCB. It is recommended to connect a bypass capacitor (1µF) from DC to GND.

If the prequal or fast-charge timers expire and the charging threshold voltage is not reached, power or raise

For optimal thermal performance connect to copper on PCB (electrically this can be GND).

(open-drain output) will go low. Remove the fault by cycling

FLT

.

EN

to

EN

APM8600

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Functional Block Diagram

APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

NEW PRODUCT

DC

SETI

EN CT

3.0V

4.2V

CHARGE

CONDITION

COMPARATORS

CHARGER REGULATOR

OVLO UVLO

V

DROP

PREQUAL

CHARGE

CONTROL

TIMER

THERMAL CURRENT

FOLDBACK

PROTECTION

1.5V

REFERENCE

BAT

THM

FLT

POR

APM8600

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GND

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CHG

December 2010

APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

Absolute Maximum Ratings

Symbol Parameter Rating Unit

DC to GND -0.3 to 28V V

ESD Susceptibility (Note 2)

HBM Human Body Model 2 kV

MM Machine Model 200 V

Note: 2. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be

taken when handling and transporting this device.

BAT, CT, SETI, THM, to GND -0.3 to 6V

FLT

,

CHG, POK

Thermal Resistance (Note 3)

Symbol Parameter Rating Unit

θ

Junction to Ambient 40 °C/W

JA

Note: 3. Test condition for DFN3030-10: Device mounted on FR-4 2-layer board, 2oz copper, with minimum recommended pad on top layer and 6 vias to bottom layer 1.0”x1.5” ground plane.

NEW PRODUCT

, EN

V

Recommended Operating Conditions (Note 4)

Symbol Parameter Rating Unit

Ambient Temperature Range -40 to +85 °C

I

Typical Charge Current 0.1 to 1.0 A

CHARGE

Note: 4. The device function is not guaranteed outside of the recommended operating conditions.

Input Supply Voltage

4.15 to 7.00

V

APM8600

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Electrical Characteristics

APM8600 is tested at VDC = 5V, V otherwise noted.

Symbol Parameter Test Conditions Min Typ. Max Unit

NEW PRODUCT

V

DC

V

DC

UVLO

OVLO Input Overvoltage Lock Out

IDC Input Supply Current I

I

SHTDWN

R

DS_ON

V

DROPOUT

V

BAT_REG

BAT

RSTTH

I

DC_CHG

SS Soft-Start Time Ramp time to fast-charge 1.2 ms

V

PREQ_TH

I

LEAK

R

SETI

Note: 5. Guaranteed by testing of undervoltage- and overvoltage-threshold. To completely charge a battery cell, the input voltage must be greater than 4.32V.

Input Voltage Range 0 28 V Input Operating Range (Note 5) 4.15 7.00 V Input Undervoltage Lock Out

(Note 5)

Shutdown Current

Input to BAT On-Resistance Input = 3.7V, V

Input to BAT dropout Voltage

Battery Voltage Regulation I

Battery Fast-Charge Restart Threshold

DC Charge Current V

USB

BAT Prequel Threshold

BAT Leakage Current VDC = V

Resista nce Ra nge for SETI Guaranteed by charging current 1.5 5.0 kΩ

= 0V

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

= 4V, VEN = 0V, R

BAT

APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

= 2kΩ, CCT = 68nF, at an ambient temperature of +25°C unless

SETI

Input rising, 500mV hysteresis

BAT

= 3.2V

(typ.) V Input rising, 200mV hysteresis

(typ.)

= 0mA, R

BAT

= High, TA = 25ºC

EN

= 10kΩ 750 1200 µA

THM

= 3.6V 0.5 0.8 Ω

BAT

Input falling, 200mV hysteresis (typ.)

= 0mA, TA = 25ºC 4.179 4.2 4.221 V

BAT

From BAT regulation voltage -230 -175 -110 mV R

= 1.5kΩ 950 1000 1140

SETI

R

= 2.0kΩ 727 750 870

SETI

R

= 5.0kΩ 280 300 353

SETI

Prequal, R

V

rising, 180mV hysteresis

BAT

= 2kΩ, V

SETI

= 2.5V 60 75 95

BAT

(typ.)

USB

= 0V, V

= 4.2V 0.001 5 µA

BAT

3.85 4.0 4.15 V

7.2 7.5 7.8 V

275 435 µA

5 55 150 mV

mA

2.9 3.0 3.1 V

APM8600

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Electrical Characteristics (Continued)

APM8600 is tested at VDC = 5V, V otherwise noted.

Symbol Parameter Test Conditions Min Typ. Max Unit

EN

Logic Input Thresholds

Logic Input Leakage Current

POK , CHG, FLT

Logic Output Voltage, Low

Logic Output Leakage Current, High

I

NEW PRODUCT

TOPOFF

R

THM_Pullup

Internal Pullup Resistance 10 kΩ

THM Resistance, Hot

R

THM

THM Resistance, Cold THM Resistance, Disabled

CT

Charge Timer Accuracy CCT = 68nF -20 +20 %

accu

TL

THFB

Prequal Time Limit

Prequal

TL

Charge Time Limit

CHG

Top-Off Time Limit

Top_off

Thermal Foldback Threshold

temp

Gain

Temperature

Thermal Foldback Gain

/ Top-Off Threshold

CHG

BAT

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

= 4V, VEN = 0V, R

APM8600

= 2kΩ, CCT = 68nF, at an ambient temperature of +25°C unless

SETI

Rising 1.6 Falling 0.4

V

= 0 to 5.5V,

EN

T

= 25ºC

A

1mAIII

===

FLTCHGPOK

V

= V

USB

falling,

= 0V

DC

= +25°C

T

A

I

BAT

battery is charged

R

falling, 420Ω hyst.

THM

FLTCHGPOK

R R R

5.5VVVV

===

= 1.5kΩ 75

SETI

= 2.0kΩ 37.5 56.25 75

SETI

= 5.0kΩ 22.5

SETI

(typ.)

rising, 2.7kΩ hyst.

R

THM

(typ.)

falling, 230Ω hyst.

R

THM

(typ.)

From entering prequal to going low, V

BAT

< 3V

FLT

0.001 1 µA

12 100 mV

0.001 1 µA

3.72 3.94 4.13 kΩ

26.7 28.3 29.7 kΩ 260 315 370 Ω

34.8 min

From entering fast-charge to

going low, 3V < V

FLT

BAT

<

334 min

4.2V From

charger disabled

going high to

CHG

34.8 min

Junction temperature beyond which the charge current is reduced, T Reduction of I increase in T R

SETI

rising

J

= 1.5kΩ

for

BAT

(using VDC),

J

+100 ºC

5 %/ºC

V

mA

APM8600

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APM8600

A

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

Functional Description

APM8600 is a linear Li-Ion battery charger device for single-cell applications. Charg e currents can be programm ed with the R

resistor. The device also incorporates several safety features, such as charge timers, battery temperature monitoring

SETI

and internal thermal limiting.

Functional State Diagram

NEW PRODUCT

EN = HIGH

ANY STATE

OR V OR V OR V

< V

IN

< 4.0V

IN

> 7.5V

IN

THM

POK 0 FLT 1

CHG 1 I

Timer Hold

BAT

0A

THM

POK 0 FLT 1

CHG 0 I

Timer Hold

BAT

0A

BAT

R OR (R

ND R

(R

ND R

OR R

R OR (R

ND R

(R

ND R

OR R

< 315Ω

THM

< 28.3kΩ)

THM

< 3.94kΩ)

THM

> 28.3kΩ

THM

< 315Ω

THM

< 28.3kΩ)

THM

< 3.94kΩ)

THM

> 28.3kΩ

THM

> 3.94kΩ

> 315Ω

> 3.94kΩ

> 315Ω

I

> 172.5 / R

BAT

Reset Timer

DISABLE

POK 1 FLT 1 CHG 1

I

0A

BAT

EN = LOW

ND VIN > V ND VIN > 4.0V ND VIN < 7.5V

PREQUAL

POK 0 FLT 1 CHG 1

I

150 / R

BAT

V

< 2.82V

BAT

Reset Timer

SETI

V

> 3V

BAT

Reset Timer

CHARGE

POK 0 FLT 1 CHG 0

I

(DC) 1500 / R

BAT

SETI

I

< 112.5 / R

SETI

BAT

Reset Timer

BAT

SETI

V

< 3V

BAT

ND Time out

FAULT

POK 0 FLT 0 CHG 1 I

BAT

I

> 112.5 / R

BAT

SETI

ND Time out

0A

V

TOP-OFF

BAT

< 4.05V

Reset Timer

POK 0 FLT 1 CHG 1

Time out

DONE

POK 0 FLT 1 CHG 1

I

0A

BAT

APM8600

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APM8600

°

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

Functional Description (continued)

INPUTS DC Pins 12 and 13 are the DC input. This input will allow chargin g from input voltages bet ween 4.15V and 7V, and ca n

withstand up to 28V without device damage although charging is disabled above 7.5V (typ.).

GND System ground connecti on. EN Pin 8 is the enable pin of the device. When pulled low the device will operate normally. W hen high, the device will

remain in the disabled state. For auto-starting, connect pin 8 directly to GND. SETI Pin 2 allows the charge currents to be programmed.

RSETI =

1500

ICHARGE

The charge current setting also changes the currents in prequal and top- off modes (being 10% an d 7.5% of I respectively):

150

NEW PRODUCT

IPREQUAL =

RSETI

This pin can also be used to monitor the bat tery charging current:

ICHARGE×=

THM The thermistor connection is on pin 3. This allows the battery temperature to be monitored using a 10k NTC

thermistor, which should be placed as close as possible to the batte ry cell. If no thermistor is used then this inp ut should be connected directly to ground. The charger will operate when there is less than 315Ω on this input (i.e., no thermistor connected); will be disabled when there is between 315Ω and 3.94k Ω; enabled when between 3.94kΩ and 28.3kΩ; and disabled above 28.3kΩ.

R

THM

Enabled

Disabled

Enabled

0 315Ω 3.94k 28.3k

Disabled

RSETI

112.5

ITOPOFF =

1000VSETI

Beta 3000 25.1 10 4. 6 55.1 ‐3.2 3250 27.1 10 4. 3 52.6 ‐1.3 3500 29.3 10 4 50.5 0.5 3750 31.7 10 3. 8 48.6 2.0

RSETI

ResistanceinkΩat Typicalin 0°C 25°C 50°C Hot trip ColdTrip

CHARGE

CThermistor

APM8600

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APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

Functional Description (continued)

CT The Charge Timer input on pin 5 allows sel ection of how long the system timers for Prequal, Charge and T op-off

states last. They are set by selecting the value of capacit or, C

The charge timer will hold its current value if the charging was stopped vi a the thermistor and continue when the battery is in a valid temperature range for charging.

OUTPUTS BAT Pin 1 is the current-controlled charg ing output for the bat tery cell. It should be connected to the positive t erminal of

the battery. The chip monitors the voltage on this pin. There should be a 2.2µF capacitor connected from BAT to GND.

POK The POK flag on pin 10 is pulled low when a valid power input is available on D C. It will go high when no valid

power is available and the device will enter the Dis able state.

CHG The CHG flag at pin 11 is pulled low when the device is in the Charge state. It will be high in Prequa l and Top-off

NEW PRODUCT

states. If the thermistor trips the circuit into the THM state (from Prequal or Charge states),

FLT The F LT flag on pin 14 indic ates a batter y fault, as det ermined by a time- out in either th e Prequal or Charge st ates.

If the battery voltage does not reach 3V after the prequal timer (default 34. 8mins), or does not reduce charging current to

7.5% after the charge timer (default 334mins), this indicates that the battery has failed or is failing and this will trigger the FLT flag. This flag will not automatically reset, and can only be cleared by cycling the power input or the EN pin.

:

CT

⎛

×=

min334TCHARGE

⎜ ⎝

CCT

⎞ ⎟

nF68

⎠

CCT

⎛

min34.8TTOPOFFTPREQUAL

×==

⎜

nF68

⎝

⎞ ⎟

⎠

CHG will hold its previous value.

APM8600

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WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

Functional Description (continued)

EN

CHG

V

BAT

0V

APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

4.2V

3V

I

CHARGE

1500/R

SETI

NEW PRODUCT

I

BAT

DISABLE

I

PREQUAL

150/R

0A

PREQUAL

SETI

CHARGE

I

TOPOFF

112.5/R

SETI

CHARGING PROCESS DESCRIPTION

The charging process is as follows, working through the state dia gram. The device will begin in the

Disable state as the input power supply ramps from 0V. Once the input power sup ply has got

into the valid range (4.15V – 7V), and the device is enabled then it will enter the charging of a severely discharged battery. If the battery is already partially charged then the condition to move into the

Charge state is met. If it is not then the slow charge will increase the battery voltage unti l it can enter the Charge state, or if

the voltage does not rise sufficiently befor e the ch arge time r runs out (set using the c apa citor on th e CT pin) then th e device will go into the

Fault state, indicating that the battery cell may be damag ed or has failed and is not taking charge. In the

Prequal state the battery temperature can be monitored with a 10k NTC thermistor connected to the T HM pin, and if the

battery temperature goes out of range (above ~50°C or belo w ~0°C, depending on thermistor choice) then chargi ng will be suspended with the device going into the

THM state.

Once the battery has charged to a level of 3V, the device enters the its normal voltage range, with 10 times the current used in the

Charge state, allowing faster charging of the battery in

Prequal state. For information on setting the charge currents,

see the functional description of the SETI pin. Again, the battery temperature is monitored and charg ing will be suspe nded if the temperature goes out of range. T he charge current. The device will then enter the current for the time defined by the C

Charge state will last until the current drawn by the battery drops to 7.5% of the full

Top-Off state, maintaining battery voltage and providing top-off charging

value. Once that timer completes, the device will enter the Done state, with zero

T

battery current. If the battery voltage falls b elow 4.05V then the device will automatically return to the

TOP-OFF

DONE

t

Prequal state. This state allows for slow

Charge state.

APM8600

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Ordering Information

APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

APM8600 FB - 7

Package

FB :U-DFN3030-14

Device

APM8600FB-7 FB U-DFN3030-14 3000/Tape & Reel -7

Note: 6. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.

Package

Code

Packaging

(Note 6)

Quantity Part Number Suffix

Packing

7 : Tape & Reel

7” Tape and Reel

Marking Information

( Top View )

: P3 : APM8600

NEW PRODUCT

XX

X

Y

W

Part Number Package Identification Code

APM8600FB-7 U-DFN3030-14 P3

XX

: Year : 0~9

Y

W

: Week : A~Z : 1~26 week;

a~z : 27~52 week;

z : represents 52 and 53

X

: A~Z : Internal Code

APM8600

Document number: DS35140 Rev. 1 - 2

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SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

Package Outline Dimensions (All Dimensions in mm)

U-DFN3030-14

TOP MARK

APM8600

NEW PRODUCT

2X-

0.10 C

0.08 C

0.25

0.57/0.63

B

2.95/3.05

B

0/0.05

2X-

1.6/1.8

0.40Typ.

A

Side View

0.25

(Pin #1 ID)

C

0

.

Bottom View

2.95/3.05

2.2/2.4

3

C

L

0.15/0.25

C

A

C

L

0.15

Seating Plane

0.30/0.40

0.10

C

AB

Top View

14x-0.25

14x-0.50

1.80

(Pin #1 ID)

Land Pattern Recommendation

C

L

2.40

(Unit:mm)

0.40Typ

C

L

2.65

APM8600

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Taping Orientation (Note 6)

APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

NEW PRODUCT

Note: 6. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf

APM8600

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APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

NEW PRODUCT

IMPORTANT NOTICE

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes In corporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this documen t or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign p atents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

LIFE SUPPORT

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can b e reasonably expected

to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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APM8600

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