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PDF ICS1708 Data sheet ( Hoja de datos )
| Número de pieza | ICS1708 | |
| Descripción | QuickSaver Charge Control IC for Nickel-Cadmium and Nickel-Metal Hydride Batteries | |
| Fabricantes | ETC | |
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ICS1708
QuickSaver® Charge Control IC for Nickel-Cadmium
and Nickel-Metal Hydride Batteries
General Description
The ICS1708 is a low cost 8 pin CMOS control IC for the intelligent charging of either nickel-cadmium (NiCd) or nickel-metal hydride
(NiMH) batteries. The ICS1708 uses a pulsed-current charging technique together with multiple voltage slope termination methods. The
ICS1708 employs a four stage charge sequence that provides a complete recharge without overcharging. The controller has three (3) user
selectable charge rates, user accessible clock, and two (2) charge status output pins. On power-up, the ICS1708 monitors for the presence of
a battery and begins charging. The ICS1708 is for applications where battery temperature protection is not required of the charge controller.
Applications
Embedded and charger stands for: Portable consumer products, Power tools, Audio/video products, Communications products, RC toys,
and Wireless products
Features
• Charge termination methods include: Voltage slope (+∆V/dt and +/- peak detect), and Fast charge time out to maintenance mode
• Four stage charge sequence: SoftStart conditioning, Fast charge, Topping charge, and Maintenance charge
• Three (3) user selectable charge rates: 15 minutes (4C), 60 minutes (1C), 150 minutes (C/2.5)
• Continuous polling mode for battery detection
• Adjustable open circuit (no battery) voltage reference
Benefits -compared to other methods
• Peak battery performance and extended cycle life
• Improved battery efficiency and reliability
• Lower internal resistance build-up
• Lower capacity fade
Block Diagram
OPEN CIRCUIT
REFERENCE
VOLTAGE
BATTERY
VOLTAGE
SENSE
RC (CLOCK)
0.5V
ADC
MICROCODE CONTROL
PROCESSOR
OUTPUT
CONTROL
RAM
ROM
OSCILLATOR
FAST
CHARGE
CHARGE
COMPLETE
CURRENT
SOURCE
1 page  
ICS1708
Charge Termination Methods
Charge termination methods include voltage slope and fast charge time out.
Voltage Slope Termination
The most distinctive point on the voltage curve of a battery in response to charging by a constant amplitude current is the voltage peak that
occurs as the battery approaches full charge. By mathematically calculating the first derivative of the voltage, a second curve can be
generated showing the change in voltage with respect to time as shown in Figure 6. The slope will reach a maximum just before peak
voltage. Using milestone voltage slope data as charging progresses, the ICS1708 determines when the point of full charge will occur and
accurately terminates the applied current when the battery reaches that point. The actual termination point is based on the actual charging
characteristics of the particular battery. Typically, fast charge ends around peak voltage.
Figure 6: Voltage and slope curves showing inflection and zero slope points
New, over-discharged, old, and already full batteries often produce a voltage profile that varies from that shown in Figure 6. The ICS1708
fast charge termination in these cases is based on a slight decrease in the voltage. Some new batteries may need several charge/use cycles
before their response fully stabilizes to that shown in Figure 6.
Charge Timer Termination
The controller uses a timer to limit fast charge duration. These times are internally set according to the charge rate selected and can be
adjusted slightly by changing the clock frequency. Fast charge timer termination is a safety backup feature to limit the duration of the fast
charge stage. The fast charge timer is always active and cannot be disabled. See Table 3 Charge Rate List.
5
5 Page 
ICS1708
Data Tables
Table 3: Absolute Maximum Ratings
Supply Voltage
Input/Output Levels
Ambient Operating Temperature
Storage Temperature
6.5
-0.5 to VDD + 0.5
70
-55 to 150
V
V
°C
°C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only.
Functional operation of the device at the Absolute Maximum Ratings or other conditions not consistent with the characteristics shown in this
document is not recommended. Exposure to absolute maximum rating conditions for extended periods affects product reliability.
Tamb=25°C.
Parameter
Supply Voltage
Supply Current
Internal pull-up
OPREF
High Level Source Current
CHG
Low Level Sink Current
CHG
Low Level Sink Current, indicator
CMN, MMN
Analog/Digital Converter Range
Minimum Battery Threshold
Table 4: DC Characteristics
Symbol
VDD
IDD
IIL
IOH
IOL
IOL
Conditions
V= VDD - 0.4V
V=0.4V
V=0.4V
MIN
4.5
0-2.2
TYP
5.0
7.3
75
25
25
40
0-2.3
0.5
MAX
5.5
0-2.3
UNITS
V
mA
kΩ
mA (max)
mA (max)
mA (max)
V
V
Table 5: Timing Characteristics
R≈15kΩ, C≈100pF
PARAMETER
SYMBOL
REFERENCE
Clock Frequency
Charge Pulse Width in Fast Charge Stage tFCHG see Figure A
Rest Time
tR see Figure A
Data Acquisition Time
tDA see Figure A
Cycle Time
tCYCLE
see Figure A
Polling Detect Pulse Width
Polling Detect Pulse Period
SoftStart Initial Pulse Width
SoftStart Incremental Pulse Width
Rate Select Read of CMN pin 3 at power-up or
with battery removed after fast charge starts
TYP
1.0
1048
13.0
16.4
1077
100
624
200
7.0
1160
UNITS
MHz
ms
ms
ms
ms
ms
ms
ms
ms
ms
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ICS1708.PDF ] | |
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