SM6780AS Datasheet, PDF (1/11 Pages) Nippon Precision Circuits Inc – Ni-Cd/Ni-MH Battery Charger IC

NIPPON PRECISION CIRCUITS INC.
SM6780AS
Ni-Cd/Ni-MH Battery Charger IC
OVERVIEW
The SM6780AS is a quick charge control IC for Nickel-Cadmium (Ni-Cd) and Nickel Metal Hydride (Ni-MH)
rechargeable batteries. It supports quick charge, supplemental and pulse trickle charging modes. The charging
mode is selected automatically in response to the battery voltage, temperature and charging time.
The quick charge uses either negative delta voltage detection (−∆V), temperature detection (∆T/∆t), or charg-
ing time cutoff to control the charging process. In addition, the quick charge mode can be placed on hold, if the
battery voltage or battery temperature are abnormal, until normal conditions are restored.
The SM6780AS requires few external components to realize a high-stability quick charge battery charger.
FEATURES
s Ni-Cd/Ni-MH battery quick charge control
s −∆V, ∆T/∆t, and maximum charge time cutoffs
s 3 charge modes (quick charge, supplemental,
pulse trickle charge)
s 3 selectable charge times (80, 120, and 240 min-
utes)
s Charge condition LED indicator output (on,
pulsed, off)
s Low power dissipation mode
s 4.0 to 5.5V operating supply voltage
s 300sec (typ) −∆V detection invalid time
s 8mV (typ) −∆V detection accuracy
s 25mV/min (typ) ∆T/∆t detection accuracy
s 8-pin SOP package
ORDERING INFORMATION
Device
SM6780AS
Package
8-pin SOP
PINOUT
(Top view)
TIME
LEDN
BATT
VSS
CHGN
INH
VDD
TEMP
PACKAGE DIMENSIONS
(Unit: mm)
0.15
+
−
0.1
0.05
0.695typ
5.2 0.3
1.27
0.10
0.4 0.1 _{0.12 M}
0 to 10
NIPPON PRECISION CIRCUITS—1