MC33340_05 Datasheet, PDF (1/16 Pages) ON Semiconductor – Battery Fast Charge Controllers

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
V_CC 8
Undervoltage
Internal Bias
Lockout
V_CC
V_sen
Voltage to
Frequency
1
Converter
Over
Temp
Ck
High
Battery
Detect
F/V R
Over
R ^Latch
Q
S
Temp
Detect
Battery
Pack
Low Under
t1
−DV Detect
t1/T_ref High
7
V_sen
Gate
Counter
Timer _t2
2
V_sen
Gate
t3
3
t2/T_sen
6
t3/T_ref Low
5
Fast/
Trickle
F/T
t/T
Time/
V_CC
Temp Select
GND 4
This device contains 2,512 active transistors.
Figure 1. Simplified Block Diagram
http://onsemi.com
8
1
8
1
x
A
L
Y
W
G
PDIP−8
P SUFFIX
CASE 626
MARKING
DIAGRAMS
8
MC3334xP
AWL
YYWW
1
SOIC−8
NB SUFFIX
CASE 751
8
3334x
ALYWX
G
1
= 0 or 2
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
V_sen Input 1
8 ^VCC
V_sen Gate Output 2
7 t1/T_ref High
Fast/Trickle Output 3
6 t2/T_sen
Gnd 4
5 t3/T_ref Low
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
© Semiconductor Components Industries, LLC, 2005
1
July, 2005 − Rev. 7
Publication Order Number:
MC33340/D