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
http://onsemi.com
MARKING
DIAGRAMS
8
PDIP−8
P SUFFIX
CASE 626
1
SOIC−8
NB SUFFIX
CASE 751
x
A
L
Y
W
G
1
8
3334x
ALYWX
G
MC3334xP
AWL
YYWW
8
8
1
1
= 0 or 2
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
V
sen
Input 1
V
sen
Gate Output 2
8 V
CC
7 t1/T
ref
High
6 t2/T
sen
5 t3/T
ref
Low
(Top View)
Regulator
DC
Input
V
CC
Internal Bias
V
sen
1
Voltage to
Frequency
Converter
Ck
High
Battery
Detect
Low
Under
t1
V
sen
Gate
2
3
Fast/
Trickle
F/T
GND
4
t/T
−DV Detect
Counter
Timer t2
V
sen
Gate
t3
F/V
R
Over
R
S
Temp
Detect
Undervoltage
Lockout
8
Fast/Trickle Output 3
Gnd 4
V
CC
Over
Temp
Latch
Battery
Pack
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
Q
t1/T
ref
High
7
t2/T
sen
6
t3/T
ref
Low
5
V
CC
Time/
Temp Select
This device contains 2,512 active transistors.
Figure 1. Simplified Block Diagram
©
Semiconductor Components Industries, LLC, 2005
1
July, 2005 − Rev. 7
Publication Order Number:
MC33340/D
MC33340, MC33342
MAXIMUM RATINGS
(Note 1)
Rating
Power Supply Voltage (Pin 8)
Input Voltage Range
Time/Temperature Select (Pins 5, 6, 7)
Battery Sense, (Note 2) (Pin 1)
V
sen
Gate Output (Pin 2)
Voltage
Current
Fast/Trickle Output (Pin 3)
Voltage
Current
Thermal Resistance, Junction−to−Air
P Suffix, DIP Plastic Package, Case 626
D Suffix, SO−8 Plastic Package, Case 751
Operating Junction Temperature
Operating Ambient Temperature (Note 3)
Storage Temperature
T
J
T
A
T
stg
V
IR(t/T)
V
IR(sen)
V
O(gate)
I
O(gate)
V
O(F/T)
I
O(F/T)
R
qJA
100
178
+150
−25 to +85
−55 to +150
°C
°C
°C
−1.0 to V
CC
−1.0 to V
CC
+ 0.6 or −1.0 to 10
20
50
20
50
V
mA
V
mA
°C/W
Symbol
V
CC
Value
18
Unit
V
V
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL−STD−883, Method 3015
Machine Model Method 400 V
http://onsemi.com
2
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2. Whichever voltage is lower.
3. Tested junction temperature range for the MC33340/342:
ELECTRICAL CHARACTERISTICS
(V
CC
= 6.0 V, for typical values T
A
= 25°C, for min/max values T
A
is the operating
ambient temperature range that applies (Note 3), unless otherwise noted.)
TOTAL DEVICE
(Pin 8)
UNDERVOLTAGE LOCKOUT
(Pin 8)
FAST/TRICKLE OUTPUT
(Pin 3)
V
sen
GATE OUTPUT
(Pin 2)
INTERNAL TIMING
TIME/TEMPERATURE INPUTS
(Pins 5, 6, 7)
BATTERY SENSE INPUT
(Pin 1)
Power Supply Current (Pins 5, 6, 7 Open)
Startup (V
CC
= 2.9 V)
Operating (V
CC
= 6.0 V)
Turn−Off Threshold (V
CC
Decreasing, T
A
= 25°C)
Startup Threshold (V
CC
Increasing, T
A
= 25°C)
Low State Saturation Voltage (I
sink
= 10 mA)
Off−State Leakage Current (V
O
= 20 V)
Low State Saturation Voltage (I
sink
= 10 mA)
Off−State Leakage Current (V
O
= 20 V)
Fast Charge Holdoff from −DV Detection
MC33340
MC33342
V
sen
Gate Output (Pin 2)
Gate Time
Gate Repetition Rate
Internal Clock Oscillator Frequency
Temperature Select Threshold
Under Temperature Comparator Hysteresis (Pin 5)
Input Offset Voltage, Over and Under Temperature Comparators
Programing Inputs (V
in
= 1.5 V)
Input Current
Input Current Matching
Input Resistance
Input Bias Current
Undervoltage Threshold
Overvoltage Threshold
Input Sensitivity for −DV Detection
Characteristic
MC33340, MC33342
http://onsemi.com
T
low
= −25°C
Symbol
V
th(OV)
V
th(UV)
V
th(t/T)
V
th(on)
V
th(off)
−DV
th
V
H(T)
f
OSC
t
gate
t
hold
V
OL
V
OL
I
in
DI
in
V
IO
I
CC
R
in
I
off
I
off
I
IB
T
high
= +85°C
2.75
0.95
Min
−24
−
1.9
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
V
CC
−0.7
33
1.38
0.65
0.61
2.85
−4.0
Typ
177
708
760
−30
1.0
3.0
1.0
1.2
5.0
6.0
1.0
2.0
10
10
44
10
3.25
1.05
Max
−36
2.0
2.0
2.0
2.1
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
Unit
kHz
MW
mA
mV
mV
mV
mV
ms
s
nA
nA
nA
mA
%
V
V
V
V
V
V
s
3
MC33340, MC33342
V th, OVER/UNDERVOLTAGE THRESHOLDS (V)
2.10
V
CC
= 6.0 V
2.00
1.90
Δ
f OSC, OSCILLATOR FREQUENCY CHANGE (%
16
V
CC
= 6.0 V
8.0
0
1.02
1.00
0.98
− 50
−8.0
− 25
0
25
50
75
100
125
−16
− 50
− 25
0
25
50
75
100
125
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 2. Battery Sense Input Thresholds
versus Temperature
Figure 3. Oscillator Frequency
versus Temperature
V th(t/T), TEMPERATURE SELECT THRESHOLD VOLTAGE (V
VOL , SINK SATURATION VOLTAGE (V)
0
−0.2
−0.4
−0.6
−0.8
−1.0
−50
Time mode is selected if any of
the three inputs are above the
threshold.
Temperature mode is selected
when all three inputs are below
the threshold.
−25
0
25
50
75
100
125
V
CC
V
CC
= 6.0 V
Threshold voltage is measured with respect to V
CC
.
3.2
V
CC
= 6.0 V
T
A
= 25°C
2.4
V
sen
Gate
Pin 2
1.6
Fast/Trickle
Pin 3
0.8
0
0
8.0
16
24
32
40
T
A
, AMBIENT TEMPERATURE (°C)
I
sink
, SINK SATURATION (mA)
Figure 4. Temperature Select Threshold Voltage
versus Temperature
Figure 5. Saturation Voltage versus Sink Current
V
sen
Gate and Fast/Trickle Outputs
3.1
ICC , SUPPLY CURRENT (mA)
VCC , SUPPLY VOLTAGE (V)
Startup Threshold
(V
CC
Increasing)
1.0
T
A
= 25°C
0.8
0.6
0.4
0.2
0
− 25
0
25
50
75
100
125
0
4.0
8.0
V
CC
, SUPPLY VOLTAGE (V)
12
16
T
A
, AMBIENT TEMPERATURE (°C)
3.0
2.9
2.8
Minimum Operating Threshold
(V
CC
Decreasing)
2.7
− 50
Figure 6. Undervoltage Lockout Thresholds
versus Temperature
Figure 7. Supply Current
versus Supply Voltage
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4
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 V
sen
input that
internally connects to a voltage to frequency converter and
Regulator
DC
Input
Reg Control
Internal Bias
R2
V
sen
1
R1
Charge
Status
2.0 V
1.0 V
Battery
Detect
Low
Under
t1
30
mA
t2
V
sen
Gate
t3
3
Fast/
Trickle
F/T
t/T
Time/
Temp
Select
Gnd
4
0.7 V
V
CC
30
mA
Ck
High
F/V
R
Over
Q
R
S
Temp
Detect
30
mA
t1/T
ref
High
7
t2/T
sen
6
t3/T
ref
Low
5
SW3
R4
SW2
SW1
R3
Voltage to
Frequency
Converter
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.
MC33340 or MC33342
Undervoltage
Lockout
V
CC
8
V
CC
2.9 V
Over
Temp
Latch
Battery
Pack
T
R
NTC
V
sen
Gate
2
−DV Detect
Counter
Timer
R2
+
R1
VBatt
–1
Vsen
Figure 8. Typical Battery Charging Application
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