MOTOROLA MC33340DR2, MC33340EVK Datasheet
Device
Operating
Temperature Range
Package
SEMICONDUCTOR
TECHNICAL DATA
BATTERY FAST CHARGE
CONTROLLERS
ORDERING INFORMATION
MC33340D
TA = –25° to +85°C
SO–8
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
8
1
(Top View)
PIN CONNECTIONS
Order this document by MC33340/D
V
CC
8V
sen
Input
V
sen
Gate Output
Fast/Trickle Output
Gnd
t1/T
ref
High
t2/T
sen
t3/T
ref
Low
7
6
5
1
2
3
4
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
MC33340P Plastic DIP
MC33342D SO–8
MC33342P Plastic DIP
1
MOTOROLA ANALOG IC DEVICE DATA
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/Under Temperature Detection
• Battery Over and Undervoltage Fast Charge Protection
• Power Supply Input Undervoltage Lockout with Hysteresis
• Operating Voltage Range of 3.0 V to 18 V
• 177 seconds Fast Change Hold–off Time (MC33340)
• 708 seconds Fast Change Hold–off Time (MC33342)
Simplified Block Diagram
This device contains 2,512 active transistors.
DC
Input
V
CC
Undervoltage
Lockout
Over
T emp
Latch
Battery
Detect
T emp
Detect
Time/
T emp
Select
V
sen
V
sen
Gate
Fast/
Trickle
Voltage to
Frequency
Converter
–
∆
V Detect
Counter
Timer
Battery
Pack
Internal Bias
V
CC
V
CC
Gnd
Q
R
S
t1/T
ref
High
t2/T
sen
t3/T
ref
Low
7
6
5
8
4
3
2
1
High
Low
V
sen
Gate
F/T
Over
Under
t1
t2
t3
t/T
Ck F/V R
Regulator
Motorola, Inc. 1999 Rev 3
MC33340 MC33342
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Rating Symbol Value Unit
Power Supply Voltage (Pin 8) V
CC
18 V
Input Voltage Range V
Time/Temperature Select (Pins 5, 6, 7) V
IR(t/T)
–1.0 to V
CC
Battery Sense, Note 1 (Pin 1) V
IR(sen)
–1.0 to VCC + 0.6 or –1.0 to 10
V
sen
Gate Output (Pin 2)
Voltage
Current
V
O(gate)
I
O(gate)
20
50
V
mA
Fast/Trickle Output (Pin 3)
Voltage
Current
V
O(F/T)
I
O(F/T)
20
50
V
mA
Thermal Resistance, Junction–to–Air R
θJA
°C/W
P Suffix, DIP Plastic Package, Case 626 100
D Suffix, SO–8 Plastic Package, Case 751 178
Operating Junction Temperature T
J
+150 °C
Operating Ambient Temperature (Note 2) T
A
–25 to +85 °C
Storage Temperature T
stg
–55 to +150 °C
NOTE: ESD data available upon request.
ELECTRICAL CHARACTERISTICS (V
CC
= 6.0 V , for typical values TA = 25°C, for min/max values TA is the operating
ambient temperature range that applies (Note 2), unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
BATTERY SENSE INPUT (Pin 1)
Input Sensitivity for –∆V Detection
–∆V
th
–
–4.0
–
mV
Overvoltage Threshold
V
th(OV)
1.9
2.0
2.1
V
Undervoltage Threshold
V
th(UV)
0.95
1.0
1.05
mV
Input Bias Current
I
IB
–
10
–
nA
Input Resistance
R
in
–
6.0
–
MΩ
TIME/TEMPERA TURE INPUTS (Pins 5, 6, 7)
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Á
Programing Inputs (Vin = 1.5 V)
Input Current
Input Current Matching
ÁÁÁ
Á
I
in
∆I
in
Á
Á
–24
–
ÁÁÁ
Á
–30
1.0
Á
Á
–36
2.0
ÁÁ
Á
µA
%
Input Offset Voltage, Over and Under Temperature Comparators
V
IO
–
5.0
–
mV
Under Temperature Comparator Hysteresis (Pin 5)
V
H(T)
–
44
–
mV
Temperature Select Threshold
V
th(t/T)
–
VCC –0.7
–
V
INTERNAL TIMING
Internal Clock Oscillator Frequency
f
OSC
–
760
–
kHz
БББББББББББББББББ
Á
V
sen
Gate Output (Pin 2)
Gate Time
Gate Repetition Rate
ÁÁÁ
Á
t
gate
Á
Á
–
–
ÁÁÁ
Á
33
1.38
Á
Á
–
–
ÁÁ
Á
ms
s
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Á
Fast Charge Holdoff from –∆V Detection
MC33340
MC33342
ÁÁÁ
Á
t
hold
Á
Á
–
–
ÁÁÁ
Á
177
708
Á
Á
–
–
ÁÁ
Á
s
V
sen
GATE OUTPUT (Pin 2)
Off–State Leakage Current (VO = 20 V)
I
off
–
10
–
nA
Low State Saturation Voltage (I
sink
= 10 mA)
V
OL
–
1.2
–
V
FAST/TRICKLE OUTPUT (Pin 3)
Off–State Leakage Current (VO = 20 V)
I
off
–
10
–
nA
Low State Saturation Voltage (I
sink
= 10 mA)
V
OL
–
1.0
–
V
UNDERVOLTAGE LOCKOUT (Pin 8)
Start–Up Threshold (VCC Increasing, TA = 25°C)
V
th(on)
–
3.0
3.1
V
Turn–Off Threshold (VCC Decreasing, TA = 25°C)
V
th(off)
2.75
2.85
–
V
TOTAL DEVICE (Pin 8)
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Á
Power Supply Current (Pins 5, 6, 7 Open)
Start–Up (VCC = 2.9 V)
Operating (VCC = 6.0 V)
ÁÁÁ
Á
I
CC
Á
Á
–
–
ÁÁÁ
Á
0.65
0.61
Á
Á
2.0
2.0
ÁÁ
Á
mA
NOTES: 1. Whichever voltage is lower.
2.Tested junction temperature range for the MC33340/342: T
low
= –25°CT
high
= +85°C
MC33340 MC33342
3
MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Battery Sense Input Thresholds
versus Temperature
TA, AMBIENT TEMPERATURE (°C)
Figure 2. Oscillator Frequency
versus Temperature
TA, AMBIENT TEMPERATURE (°C)
V
th
, OVER/UNDERVOL TAGE THRESHOLDS (V)
f
OSC
, OSCILLATOR FREQUENCY CHANGE (%)
∆
2.10
2.00
1.90
1.02
1.00
0.98
–50 –25 0 25 50 75 100 125
VCC = 6.0 V
16
8.0
0
–8.0
–16
–50 –25 0 25 50 75 100 125
VCC = 6.0 V
I
sink
, SINK SATURATION (mA)
Figure 3. Temperature Select Threshold Voltage
versus Temperature
Figure 4. Saturation Voltage versus Sink Current
V
sen
Gate and Fast/Trickle Outputs
TA, AMBIENT TEMPERATURE (°C)
V
th(t/T)
, TEMPERATURE SELECT THRESHOLD VOLTAGE (
V
V
OL
, SINK SATURATION VOLTAGE (V)
0
–50 –25 0 25 50 75 100 125
–0.2
–
0.4
–0.6
–0.8
–1.0
VCC = 6.0 V
V
CC
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.
Threshold voltage is measured with respect to V
CC
.
3.2
0 8.0 16 24 32 40
2.4
1.6
0.8
0
VCC = 6.0 V
TA = 25
°
C
V
sen
Gate
Pin 2
Fast/Trickle
Pin 3
–50
VCC, SUPPLY VOLTAGE (V)
Figure 5. Undervoltage Lockout Thresholds
versus Temperature
Figure 6. Supply Current
versus Supply Voltage
TA, AMBIENT TEMPERATURE (°C)
V
CC
, SUPPLY VOLTAGE (V)
I
CC
, SUPPLY CURRENT (mA)
3.1
–25 0 25 50 75 100 125
3.0
2.9
2.8
2.7
Startup Threshold
(VCC Increasing)
Minimum Operating Threshold
(VCC Decreasing)
1.0
0 4.0 8.0 12 16
0.8
0.6
0.4
0.2
0
TA = 25°C
MC33340 MC33342
4
MOTOROLA ANALOG IC DEVICE DATA
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 7.
The battery voltage is monitored by the V
sen
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 under temperature 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 8 shows the typical charge
characteristics for NiCd and NiMh batteries.
Figure 7. Typical Battery Charging Application
V
CC
Undervoltage
Lockout
Over
Temp
Latch
Battery
Detect
Temp
Detect
Time/
Temp
Select
V
sen
V
sen
Gate
Fast/
Trickle
Voltage to
Frequency
Converter
–
∆
V Detect
Counter
Timer
Battery
Pack
Internal Bias
V
CC
V
CC
Gnd
Q
R
S
t1/T
ref
High
t2/T
sen
t3/T
ref
Low
7
6
5
8
4
3
2
1
High
Low
V
sen
Gate
F/T
Over
Under
t1
t2
t3
t/T
Ck F/V R
Regulator
Reg Control
DC
Input
Charge
Status
R2
R1
MC33340 or MC33342
2.0 V
1.0 V
R
NTC
R3
R4
SW2
SW1
SW3
2.9 V
30
µ
A
30
µ
A
30
µ
A
0.7 V
R2+R1
ǒ
V
Batt
V
sen
–1
Ǔ
T
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