apm8600 Diodes, Inc., apm8600 Datasheet - Page 8

• Manufacturer Part Number: apm8600
• Description: Single Cell Linear Lithium Battery Charger With 28v Ovp And Programmable Charge Timer
• Manufacturer: Diodes, Inc.

Functional Description (continued)
INPUTS
DC
withstand up to 28V without device damage although charging is disabled above 7.5V (typ.).
GND
EN
remain in the disabled state. For auto-starting, connect pin 8 directly to GND.
SETI
respectively):
THM
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.
0
APM8600
Document number: DS35140 Rev. 1 - 2
315Ω
Pins 12 and 13 are the DC input. This input will allow charging from input voltages between 4.15V and 7V, and can
System ground connection.
Pin 8 is the enable pin of the device. When pulled low the device will operate normally. When high, the device will
Pin 2 allows the charge currents to be programmed.
The charge current setting also changes the currents in prequal and top-off modes (being 10% and 7.5% of I
This pin can also be used to monitor the battery charging current:
The thermistor connection is on pin 3. This allows the battery temperature to be monitored using a 10k NTC
3.94k
R
THM
IPREQUAL =
Enabled
WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER
RSETI
ICHARGE
150
SINGLE CELL LINEAR LITHIUM BATTERY CHARGER
RSETI =
www.diodes.com
28.3k
=
8 of 14
ICHARGE
VSETI
1500
RSETI
×
1000
ITOPOFF =
Thermistor
Beta
3000
3250
3500
3750
RSETI
25.1
27.1
29.3
31.7
112.5
Resistance in kΩ at
0°C
25°C
10
10
10
10
50°C
4.6
4.3
3.8
4
APM8600
Hot trip Cold Trip
55.1
52.6
50.5
48.6
Typical in °C
© Diodes Incorporated
December 2010
‐3.2
‐1.3
0.5
2.0
CHARGE