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PDF SC1766CS14 Data sheet ( Hoja de datos )
| Número de pieza | SC1766CS14 | |
| Descripción | BATTERY CHARGE CONTROLLER | |
| Fabricantes | Semtech Corporation | |
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BATTERY
CHARGE CONTROLLER
SC1766
Janaury 30, 1998
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1766 fast charge controller IC is designed for
intelligent charging of NiMH or NiCd batteries without
overcharging. It detects a voltage drop (-∆V) occurring
in the final stage of a fast charging cycle and
correspondingly controls the charging current. Fast
charge can also be cut off by a peak voltage timer
(0∆V).
The detection of -∆V is a very reliable method to
terminate fast charging for NiMH and NiCd batteries.
The SC1766 uses -∆V detection as one of the primary
decisions for fast charge cut-off. The -∆V value of the
SC1766 is as small as 4mV per cell, particularly
suitable for NiMH as well as NiCd batteries. The peak
voltage timer is particularly useful when the voltage
drop at the end of charge for some batteries, e.g.
NiMH cells, is not pronounced enough for reliable
detection. An adjustable safety timer (3 settings) is
used as a backup termination method. Provisions are
made with the SC1766 to prevent fast charge under
temperature fault conditions. Two LED outputs are
used to indicate the charging status. Another flash LED
output can be used alone to indicate charge status.
AC mode allows the battery to drive its loads while
being charged. Test mode is provided to dramatically
reduce production test time.
FEATURES
• Reliable fast charge control of NiMH/NiCd
batteries
• Fast charge termination by:
1 Accurate -∆V detection level -0.25% with
respect to peak value
2 Peak voltage timer (0∆V)
• Adjustable fast charge safety timer
• Protection against temperature fault
• Protection against short-circuited and open
batteries
• Wide operation voltage range of 9V to 18V, no
extra regulator needed
• Large battery voltage detection range of 0.65V to
3.7V
• LED drivers to indicate charge status or fault
conditions
• Voltage reference output
• Quick and easy testing for production
• Space saving 8-pin and 14-pin SO packages
ORDERING INFORMATION
DEVICE(1)
PACKAGE
SC1766CS08
SO-8
SC1766CS14
SO-14
Note:
(1) Add suffix ‘TR’ for tape and reel.
APPLICATIONS
Battery chargers for:
• Mobile phones
• Notebook and laptop personal computers
• Portable power tools and toys
• Portable communications equipment
• Portable video and stereo equipment
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Maximum
Supply Voltage
DC Voltage Applied
to any Pin
VCC
18
18
Sink Current of VOUT
pin, LED pin, and
FLASH pin
20
Operating
Temperature Range
TA
0 to 70
Storage
Temperature Range
TSTG
-65 to 150
Units
V
V
mA
°C
°C
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
BATTERY
CHARGE CONTROLLER
Janaury 30, 1998
TYPICAL APPLICATIONS (cont.)
Step Down Low-Side Current Sense Battery Charger
SC1766
Discharge Circuit of
Rechargeable Battery
FINAL VOLTAGE
OF BATTERY R26
6V 6.8K
5V 5.1K
4V 3.9K
3V 2.7K
Test Circuit
NOTE: The final voltage of battery is determined by R26.
Discharge current is decided by R5. S1: Push to initiate discharge.
Flashing-LED Circuit for Trickle Mode
Buzzer Circuit for Trickle Charge Mode
NOTE: Frequency (about 1Hz) is determined by R33 and C33.
LED will flash when LED pin goes low.
© 1997 SEMTECH CORP.
NOTE: Frequency (about 1Hz) is determined by R33 and C33.
Buzzer will be activated when LED pin goes low.
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page 
BATTERY
CHARGE CONTROLLER
SC1766
Janaury 30, 1998
CHARGER CIRCUIT DESIGN TIPS
1. A stable constant charge current is crucial for reli-
able precision -∆V detection by the SC1766 since fluc-
tuation of the charge current can cause fluctuation of
the battery terminal voltage due to battery internal se-
ries resistance, which will likely result in erroneous -∆V
detection by a properly functioning SC1766.
2. To prevent damage to the SC1766 from over-
voltage, make sure that none of the SC1766 pins see
any voltage beyond the supply voltage, which needs to
be between +9V and +18V.
3. If the battery charge current is high, e.g. over 1.5A,
quality of circuit board layout and wiring connection
points become increasingly important in the charger
circuit reliability.
4. Since the SC1766 is a CMOS device, care must be
taken in handling to avoid possible damage from elec-
trostatic discharge.
OUTLINE DRAWING SO-8
OUTLINE DRAWING SO-14
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SC1766CS14.PDF ] | |
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