APM8600

NOT RECOMMENDED FOR NEW DESIGN
APM8600
Green
SINGLE CELL LINEAR LITHIUM BATTERY CHARGER
WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER
Description
Pin Assignments
BAT
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 temperature
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.
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
U-DFN3030-14: Available in “Green” Molding
Compound
(No Br, Sb)
•
•
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
1
14 FLT
SETI 2
13 DC
THM
3
12 DC
GND
4
CT
5
10 POK
DNC
6
9
NC
NC
7
8
EN
APM8600
11 CHG
Figure 1 Pin Out
Applications
•
•
•
•
•
Handheld Consumer Devices
Cell Phones, PDAs, MP3 Players
Handheld Test Equipment
Digital Still Cameras
Multimedia Players
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
APM8600
Document number: DS35140 Rev. 2 - 3
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NOT RECOMMENDED FOR NEW DESIGN
APM8600
Typical Application Circuit
DC Input
To Battery
DC
BAT
GND
Attach to cell
THM
APM8600
POK
Charge status
BAT
OFF
ON
EN
CHG
CT
Status LED
SETI
+5V
Figure 2. Typical Application Circuit
Pin Descriptions
BAT
1
14 FLT
13 DC
SETI 2
APM8600
Document number: DS35140 Rev. 2 - 3
THM
3
GND
4
12 DC
APM8600
11 CHG
CT
5
10 POK
DNC
6
9
NC
NC
7
8
EN
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APM8600
Name
Pin #
Description
Connection to the
Battery
Charge Current
programming
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 Input thermistor as close as possible to the battery. Connect THM to GND if
temperature measurement is not required.
Ground
Ground connection.
Connecting a capacitor from CT to GND will set the time-outs for prequal, top-off
Charge Timing
and fast-charge. Connecting CT direct to GND disables these timers.
BAT
1, 7
SETI
2
THM
3
GND
4
CT
5
EN
8
Enable
(Active-low)
The charger is enabled when this input is low. To start the charger connect EN to
GND. Drive this input high to disable the charger.
POK
10
Power OK
(Active -low)
When a valid input source is connected, this open-drain output is pulled low.
CHG
11
DC
12, 13
FLT
14
EP
NC
NC
7,9
6
Open-drain output that indicates the charging status. It is active only in the fastcharge 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
DC Input
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
Fault Flag
not reached, FLT (open-drain output) will go low. Remove the fault by cycling
(Active -low)
power or raise EN .
For optimal thermal performance connect to copper on PCB (electrically this can
Exposed Pad
be GND).
Not Connected Floating pins
Do Not Connect Must not connect
Charge Status
(Active -low)
APM8600
Document number: DS35140 Rev. 2 - 3
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APM8600
Functional Block Diagram
BAT
DC
SETI
CHARGER REGULATOR
THERMAL
CURRENT
FOLDBACK
PROTECTION
1.5V
REFERENCE
OVLO
3.0V
CHARGE
CONDITION
COMPARATORS
4.2V
UVLO
VDROP
PREQUAL
THM
CHARGE
CONTROL
EN
FLT
CT
TIMER
POR
CHG
GND
APM8600
Document number: DS35140 Rev. 2 - 3
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APM8600
Absolute Maximum Ratings
Symbol
–
Parameter
Rating
-0.3 to 28V
DC to GND
BAT, CT, SETI, THM, FLT , CHG , POK , EN
to GND
ESD Susceptibility (Note 4)
HBM
Human Body Model
MM
Machine Model
–
Note:
-0.3 to 6V
2
200
Unit
V
V
kV
V
4. 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.
Thermal Resistance (Note 5)
Symbol
θJA
Note:
Parameter
Junction to Ambient
Rating
Unit
40
°C/W
5. 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.
Recommended Operating Conditions (Note 6)
Symbol
–
–
ICHARGE
Note:
Parameter
Ambient Temperature Range
Input Supply Voltage
Typical Charge Current
Rating
-40 to +85
4.15 to 7.00
0.1 to 1.0
Unit
°C
V
A
6. The device function is not guaranteed outside of the recommended operating conditions.
APM8600
Document number: DS35140 Rev. 2 - 3
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APM8600
Electrical Characteristics
APM8600 is tested at VDC = 5V, VBAT = 4V, V EN = 0V, RSETI = 2kΩ, CCT = 68nF, at an ambient temperature of +25°C unless
otherwise noted.
Symbol
Parameter
Test Conditions
Min
Typ.
Max
Unit
VDC
Input Voltage Range
–
0
–
28
V
VDC
Input Operating Range (Note 7)
–
4.15
–
7.00
V
UVLO
Input Undervoltage Lock Out
(Note 7)
Input rising, 500mV hysteresis
(typ.) VBAT = 3.2V
3.85
4.0
4.15
V
OVLO
Input Overvoltage Lock Out
Input rising, 200mV hysteresis
(typ.)
7.2
7.5
7.8
V
Input Supply Current
IBAT = 0mA, RTHM = 10kΩ
–
750
1200
µA
ISHTDWN
Shutdown Current
EN =
–
275
435
µA
RDS_ON
Input to BAT On-Resistance
Input = 3.7V, VBAT = 3.6V
–
0.5
0.8
Ω
VDROPOUT
Input to BAT dropout Voltage
Input falling, 200mV hysteresis
(typ.)
5
55
150
mV
VBAT_REG
Battery Voltage Regulation
IBAT = 0mA, TA = +25ºC
4.179
4.2
4.221
V
BATRSTTH
Battery Fast-Charge Restart
Threshold
From BAT regulation voltage
-230
-175
-110
mV
RSETI = 1.5kΩ
950
1000
1140
RSETI = 2.0kΩ
727
750
870
RSETI = 5.0kΩ
280
300
353
Prequal, RSETI = 2kΩ, VBAT = 2.5V
60
75
95
–
1.2
–
ms
2.9
3.0
3.1
V
–
0.001
5
µA
1.5
–
5.0
kΩ
IDC
IDC_CHG
SS
Soft-Start Time
Ramp time to fast-charge
BAT Prequel Threshold
VBAT rising, 180mV hysteresis
(typ.)
ILEAK
BAT Leakage Current
VDC = VUSB = 0V, VBAT = 4.2V
RSETI
Resistance Range for SETI
Guaranteed by charging current
VPREQ_TH
Note:
DC Charge Current
VUSB = 0V
High, TA = +25ºC
mA
7. Guaranteed by testing of undervoltage- and overvoltage-threshold. To completely charge a battery cell, the input voltage must be greater than 4.32V.
APM8600
Document number: DS35140 Rev. 2 - 3
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APM8600
Electrical Characteristics (Cont.)
APM8600 is tested at VDC = 5V, VBAT = 4V, V EN = 0V, RSETI = 2kΩ, CCT = 68nF, at an ambient temperature of +25°C unless
otherwise noted.
Symbol
Parameter
Test Conditions
Min
Typ.
Max
Unit
–
–
1.6
0.4
–
–
–
0.001
1
µA
–
12
100
mV
–
0.001
1
µA
–
75
–
75
56.25
22.5
–
10
–
kΩ
3.72
3.94
4.13
kΩ
26.7
28.3
29.7
kΩ
260
315
370
Ω
-20
–
+20
%
EN
Logic Input Thresholds
–
Logic Input Leakage Current
Rising
Falling
VEN = 0 to 5.5V,
TA = 25ºC
V
POK , CHG , FLT
Logic Output Voltage, Low
–
ITOPOFF
RTHM_Pullup
Logic Output Leakage Current,
High
CHG / Top-Off Threshold
Internal Pullup Resistance
THM Resistance, Hot
RTHM
THM Resistance, Cold
THM Resistance, Disabled
CTaccu
Charge Timer Accuracy
TLPrequal
Prequal Time Limit
TLCHG
Charge Time Limit
TLTop_off
Top-Off Time Limit
THFBtemp
Thermal Foldback Threshold
Temperature
THFBGain
Thermal Foldback Gain
APM8600
Document number: DS35140 Rev. 2 - 3
IPOK  ICHG  IFLT  1mA
VPOK  VCHG  VFLT  5.5V
VDC = VUSB = 0V
TA = +25°C
IBAT falling, RSETI = 1.5kΩ
battery is
RSETI = 2.0kΩ
charged
RSETI = 5.0kΩ
–
RTHM falling, 420Ω hyst.
(typ.)
RTHM rising, 2.7kΩ hyst.
(typ.)
RTHM falling, 230Ω hyst.
(typ.)
CCT = 68nF
From entering prequal to FLT
going low, VBAT < 3V
From entering fast-charge to
FLT going low, 3V < VBAT <
4.2V
From CHG going high to
charger disabled
Junction temperature beyond
which the charge current is
reduced, TJ rising
Reduction of IBAT for
increase in TJ (using VDC),
RSETI = 1.5kΩ
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37.5
–
mA
–
34.8
min
334
min
34.8
min
+100
ºC
5
%/ºC
May 2016
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
APM8600
Functional Description
APM8600 is a linear Li-Ion battery charger device for single-cell applications. Charge currents can be programmed with the
RSETI resistor. The device also incorporates several safety features, such as charge timers, battery temperature monitoring and
internal thermal limiting.
Functional State Diagram
OR
OR
OR
ANY STATE
DISABLE
EN = HIGH
VIN < VBAT
VIN < 4.0V
VIN > 7.5V
POK 1
IBAT
FLT
1
PREQUAL
THM
POK
0
1
IBAT
Timer Hold
FLT
1
EN = LOW
AND VIN > VBAT
AND VIN > 4.0V
AND VIN < 7.5V
RTHM < 315Ω
OR (RTHM > 3.94kΩ
AND RTHM < 28.3kΩ)
CHG
CHG
0A
POK 0
IBAT
1
0A
FLT
1 CHG
150 / RSETI
1
VBAT < 3V
AND Time out
(RTHM > 315Ω
AND RTHM < 3.94kΩ)
OR RTHM > 28.3kΩ
FAULT
VBAT < 2.82V
Reset Timer
VBAT > 3V
Reset Timer
RTHM < 315Ω
OR (RTHM > 3.94kΩ
AND RTHM < 28.3kΩ)
CHARGE
THM
POK
0
FLT
CHG
0
IBAT
Timer Hold
POK 0
IBAT (DC)
1
0A
0
FLT
0
CHG
1
IBAT
0A
0
IBAT < 112.5 / RSETI
Reset Timer
VBAT < 4.05V
Reset Timer
TOP-OFF
POK
0
IBAT > 112.5 / RSETI
AND Time out
FLT 1 CHG
1500 / RSETI
(RTHM > 315Ω
AND RTHM < 3.94kΩ)
OR RTHM > 28.3kΩ
IBAT > 172.5 / RSETI
Reset Timer
POK
FLT
1
CHG
1
Time out
DONE
POK 0
IBAT
APM8600
Document number: DS35140 Rev. 2 - 3
FLT
1
CHG
0A
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APM8600
Functional Description (Cont.)
INPUTS
DC
Pins 12 and 13 are the DC input. This input will allow charging from input voltages between 4.15V and 7V, and can
withstand up to 28V without device damage although charging is disabled above 7.5V (typ.).
GND
System ground connection.
EN
Pin 8 is the enable pin of the device. When pulled low the device will operate normally. When 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% and 7.5% of ICHARGE
respectively):
IPREQUAL 
150
RSETI
ITOPOFF 
112.5
RSETI
This pin can also be used to monitor the battery charging current:
ICHARGE
VSETI 1000
RSETI
0
315Ω
Enabled
3.94k
APM8600
Document number: DS35140 Rev. 2 - 3
RTHM
Disabled
Enabled
Disabled
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 battery cell. If no thermistor is used then this input 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 3.94kΩ; enabled when between 3.94kΩ and 28.3kΩ; and disabled above 28.3kΩ.
28.3k
Thermistor
Beta
3000
3250
3500
3750
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Resistance in kΩ at
0°C
25°C 50°C
25.1
10
4.6
27.1
10
4.3
29.3
10
4
31.7
10
3.8
Typical in °C
Hot trip Cold Trip
55.1
-3.2
52.6
-1.3
50.5
0.5
48.6
2.0
May 2016
© Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
APM8600
Functional Description (Cont.)
CT
The Charge Timer input on pin 5 allows selection of how long the system timers for Prequal, Charge and Top-off
states last. They are set by selecting the value of capacitor, C CT:
 CCT 
TCHARGE  334 min 

 68nF 
 CCT 
TPREQUAL  TTOPOFF  34.8min 

 68nF 
The charge timer will hold its current value if the charging was stopped via the thermistor and continue when the battery is in a
valid temperature range for charging.
OUTPUTS
BAT
Pin 1 is the current-controlled charging output for the battery cell. It should be connected to the positive terminal 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 DC. It will go high when no valid power is
available and the device will enter the Disable state.
CHG
The CHG flag at pin 11 is pulled low when the device is in the Charge state. It will be high in Prequal and Top-off
states. If the thermistor trips the circuit into the THM state (from Prequal or Charge states), CHG will hold its previous value.
FLT
The FLT flag on pin 14 indicates a battery fault, as determined by a time-out in either the Prequal or Charge states. 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.
APM8600
Document number: DS35140 Rev. 2 - 3
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APM8600
Functional Description (Cont.)
EN
CHG
4.2V
3V
VBAT
0V
DONE
TOP-OFF
CHARGE
DISABLE
IBAT
PREQUAL
ICHARGE
1500/RSETI
IPREQUAL
150/RSETI
0A
ITOPOFF
112.5/RSETI
t
CHARGING PROCESS DESCRIPTION
The charging process is as follows, working through the state diagram.
The device will begin in the Disable state as the input power supply ramps from 0V. Once the input power supply has got into
the valid range (4.15V – 7V), and the device is enabled then it will enter the Prequal state. This state allows for slow 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 until it can enter the Charge state, or if the voltage does
not rise sufficiently before the charge timer runs out (set using the capacitor on the CT pin) then the device will go into the Fault
state, indicating that the battery cell may be damaged 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 THM pin, and if the battery temperature goes out of
range (above ~50°C or below ~0°C, depending on thermistor choice) then charging 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 Charge state, allowing faster charging of the battery in its
normal voltage range, with 10 times the current used in the Prequal state. For information on setting the charge currents, see
the functional description of the SETI pin. Again, the battery temperature is monitored and charging will be suspended if the
temperature goes out of range. The Charge state will last until the current drawn by the battery drops to 7.5% of the full charge
current. The device will then enter the Top-Off state, maintaining battery voltage and providing top-off charging current for the
time defined by the CT value. Once that timer completes, the device will enter the Done state, with zero battery current. If the
battery voltage falls below 4.05V then the device will automatically return to the Charge state.
APM8600
Document number: DS35140 Rev. 2 - 3
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APM8600
Ordering Information
APM8600 FB - 7
Device
APM8600FB-7
Note:
Package
Code
FB
Package
Packing
FB :U-DFN3030-14
7 : Tape & Reel
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
Packaging
(Note 8)
U-DFN3030-14
8. Pad layout as shown on Diodes Inc. suggested pad layout document, which can be found on our website at
http://www.diodes.com/package-outlines.html.
Marking Information
( Top View )
XX
Y WX
XX : P4 : APM8600
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week;
z : represents 52 and 53
X : A~Z : Internal Code
Part Number
Package
Identification Code
APM8600FB-7
U-DFN3030-14
P3
APM8600
Document number: DS35140 Rev. 2 - 3
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APM8600
Package Outline Dimensions (All Dimensions in mm)
U-DFN3030-14
0.15
TOP MARK
0.10 C
0.08 C
C
2.95/3.05
2.2/2.4
B
14x-0.50
0.25 A
0/0.05
Side View
2X-
0.57/0.63
Seating Plane
A
Top View
0.40Typ
14x-0.25
CL
2X-
C0
0.25 B
0.40Typ.
CL
CL
0.15/0.25
(Pin #1 ID)
0.10
Bottom View
APM8600
Document number: DS35140 Rev. 2 - 3
CL
2.65
1.80
.3
0.30/0.40
1.6/1.8
2.95/3.05
(Pin #1 ID)
C A B
2.40
Land Pattern Recommendation
(Unit:mm)
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APM8600
Taping Orientation (Note 9)
Note:
9. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf
APM8600
Document number: DS35140 Rev. 2 - 3
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NOT RECOMMENDED FOR NEW DESIGN
APM8600
IMPORTANT NOTICE
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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 Incorporated convey any license under its patent or
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website, harmless against all damages.
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indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
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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 be 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 devices 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.
Copyright © 2016, Diodes Incorporated
www.diodes.com
APM8600
Document number: DS35140 Rev. 2 - 3
15 of 15
www.diodes.com
May 2016
© Diodes Incorporated
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