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MC33342 Datasheet PDF - ON Semiconductor

Part Number MC33342
Description (MC33340 / MC33342) Battery Fast Charge Controllers
Manufacturers ON Semiconductor 
Logo ON Semiconductor Logo 



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MC33342 datasheet, circuit
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
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177 seconds Fast Change Holdoff Time (MC33340)
708 seconds Fast Change Holdoff Time (MC33342)
Pb−Free Packages are Available
DC
Input
VCC 8
Undervoltage
Internal Bias
Lockout
VCC
Vsen
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/Tref High
7
Vsen
Gate
Counter
Timer t2
2
Vsen
Gate
t3
3
t2/Tsen
6
t3/Tref Low
5
Fast/
Trickle
F/T
GND
t/T
Time/
Temp Select
4
VCC
This device contains 2,512 active transistors.
Figure 1. Simplified Block Diagram
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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
Vsen Input 1
8 VCC
Vsen Gate Output 2
7 t1/Tref High
Fast/Trickle Output 3
6 t2/Tsen
Gnd 4
5 t3/Tref 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
July, 2005 − Rev. 7
1
Publication Order Number:
MC33340/D

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MC33342 equivalent
MC33340, MC33342
INTRODUCTION
Nickel Cadmium and Nickel Metal Hydride batteries
require precise charge termination control to maximize cell
capacity and operating time while preventing overcharging.
Overcharging can result in a reduction of battery life as well
as physical harm to the end user. Since most portable
applications require the batteries to be charged rapidly, a
primary and usually a secondary or redundant charge sensing
technique is employed into the charging system. It is also
desirable to disable rapid charging if the battery voltage or
temperature is either too high or too low. In order to address
these issues, an economical and flexible fast charge controller
was developed.
The MC33340/342 contains many of the building blocks
and protection features that are employed in modern high
performance battery charger controllers that are specifically
designed for Nickel Cadmium and Nickel Metal Hydride
batteries. The device is designed to interface with either
primary or secondary side regulators for easy implementation
of a complete charging system. A representative block diagram
in a typical charging application is shown in Figure 8.
The battery voltage is monitored by the Vsen input that
internally connects to a voltage to frequency converter and
counter for detection of a negative slope in battery voltage. A
timer with three programming inputs is available to provide
backup charge termination. Alternatively, these inputs can be
used to monitor the battery pack temperature and to set the
over and undertemperature limits also for backup charge
termination.
Two active low open collector outputs are provided to
interface this controller with the external charging circuit.
The first output furnishes a gating pulse that momentarily
interrupts the charge current. This allows an accurate method
of sampling the battery voltage by eliminating voltage drops
that are associated with high charge currents and wiring
resistances. Also, any noise voltages generated by the
charging circuitry are eliminated. The second output is
designed to switch the charging source between fast and
trickle modes based upon the results of voltage, time, or
temperature. These outputs normally connect directly to a
linear or switching regulator control circuit in non−isolated
primary or secondary side applications. Both outputs can be
used to drive optoisolators in primary side applications that
require galvanic isolation. Figure 9 shows the typical charge
characteristics for NiCd and NiMh batteries.
Regulator
DC
Input
Charge
Status
Reg Control
R2
R1
MC33340 or MC33342
VCC 8
Internal Bias
Undervoltage
Lockout
Vsen
Voltage to
Frequency
1 Converter
Over
Temp
Ck
High
F/V R
Over
Latch
R
Q
2.0 V
Battery
S
Temp
Detect
Detect
1.0 V Low Under
t1
DV Detect
Counter
Vsen Timer
Gate t2
2
Vsen
Gate
t3
3
VCC
2.9 V
30 mA
30 mA
30 mA
Fast/
Trickle
F/T
t/T
Time/
Temp
Select
ǒ ǓR2 + R1
VBatt
Vsen
1
Gnd
4
VCC
0.7 V
Figure 8. Typical Battery Charging Application
T RNTC
Battery
Pack
t1/Tref High
7
SW1 R3
t2/Tsen
6
SW2
t3/Tref Low
5 SW3
R4
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Information Total 16 Pages
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