MC33340, MC33342
Battery Fast Charge
Controllers
The MC33340 and MC33342 are monolithic control IC’s that are
specifically designed as fast charge controllers for Nickel Cadmium
(NiCd) and Nickel Metal Hydride (NiMH) batteries. These devices
feature negative slope voltage detection as the primary means for fast
charge termination. Accurate detection is ensured by an output that
momentarily interrupts the charge current for precise voltage
sampling. An additional secondary backup termination method can
be selected that consists of either a programmable time or temperature
limit. Protective features include battery over and undervoltage
detection, latched over temperature detection, and power supply input
undervoltage lockout with hysteresis. Fast charge holdoff time is the
only difference between the MC33340 and the MC33342. The
MC33340 has
a typical holdoff time of 177 seconds and the
MC33342 has a typical holdoff time of 708 seconds.
•
Negative Slope Voltage Detection with 4.0 mV Sensitivity
•
Accurate Zero Current Battery Voltage Sensing
•
High Noise Immunity with Synchronous VFC/Logic
•
Programmable 1 to 4 Hour Fast Charge Time Limit
•
Programmable Over/Undertemperature Detection
•
Battery Over and Undervoltage Fast Charge Protection
•
Power Supply Input Undervoltage Lockout with Hysteresis
•
Operating Voltage Range of 3.25 V to 18 V
•
177 seconds Fast Change Holdoff Time (MC33340)
•
708 seconds Fast Change Holdoff Time (MC33342)
•
Pb−Free Packages are Available
DC
Input
Internal Bias
Voltage to
V
sen
Frequency
Converter
1
Ck
F/V
High
Over
Battery
Detect
Low
Under
−DV Detect
Counter
V
sen
Timer
Gate
V
sen
2
Gate
3
Fast/
F/T
Trickle
GND
4
This device contains 2,512 active transistors.
Figure 1. Simplified Block Diagram
© Semiconductor Components Industries, LLC, 2005
July, 2005 − Rev. 7
www.DataSheet4U.com
V
8
CC
Undervoltage
Lockout
V
CC
Over
Temp
Latch
R
R
Battery
Q
S
Pack
Temp
Detect
t1/T
High
ref
t1
7
t2/T
sen
t2
6
t3/T
Low
ref
t3
5
V
CC
t/T
Time/
Temp Select
1
http://onsemi.com
MARKING
DIAGRAMS
8
PDIP−8
MC3334xP
P SUFFIX
CASE 626
8
1
1
8
SOIC−8
3334x
NB SUFFIX
8
ALYWX
CASE 751
1
1
x
= 0 or 2
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
PIN CONNECTIONS
V
V
Input
1
8
CC
sen
t1/T
2
7
V
Gate Output
ref
sen
3
6
Fast/Trickle Output
t2/T
sen
4
5
t3/T
Gnd
ref
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
Publication Order Number:
MC33340/D
AWL
YYWW
G
High
Low