Datasheet MC33340P, MC33340D Datasheet (Motorola)

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Order this document by MC33340/D

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The MC33340 is a monolithic control IC that is specifically designed as a
fast charge controller for Nickel Cadmium (NiCd) and Nickel Metal Hydride
(NiMH) batteries. This device features 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. Provisions for entering a rapid test mode are available to
enhance end product testing. This device is available in an economical
8–lead surface mount package.

• 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

• Rapid System Test Mode

• Power Supply Input Undervoltage Lockout with Hysteresis

• Operating Voltage Range of 3.0 V to 18 V

Simplified Block Diagram

BATTERY FAST CHARGE

CONTROLLER

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

8

1

8

1

CASE 626

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

DC

Input

∆

V Detect

Counter

Timer

Undervoltage
Lockout

Over

Under

t1

t2

t3

t/T

Time/
Temp
Select

4

R

Q

S

Regulator

Internal Bias

V

sen

1

V

sen

Gate

2

3

Fast/

Trickle

This device contains 2,512 active transistors.

This document contains information on a new product. Specifications and information herein
are subject to change without notice.

MOTOROLA ANALOG IC DEVICE DATA

Voltage to

Frequency

Converter

Ck F/V R

High

Battery
Detect

Low

V
Gate

F/T

–

sen

Gnd

V

Over
Temp
Latch

Temp
Detect

CC

8

V

CC

Battery

Pack

t1/T

High

ref

7
t2/T

sen
6
t3/T

Low

ref
5

V

CC

PIN CONNECTIONS

V

Input

sen

V

Gate Output

sen

Fast/Trickle Output

Gnd

1
2
3
4

(Top View)

8V

CC

t1/T

High

7

ref

6

t2/T

sen

5

t3/T

Low

ref

ORDERING INFORMATION

Operating

Device

MC33340D
MC33340P Plastic DIP

 Motorola, Inc. 1996 Rev 0

Temperature Range

TA = –25° to +85°C

Package

SO–8

1

MC33340

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage (Pin 8) V

CC

Input Voltage Range V

Time/Temperature Select (Pins 5, 6, 7) V
Battery Sense, Note 1 (Pin 1) V

V

Gate Output (Pin 2)

sen

Voltage
Current

IR(t/T)

IR(sen)

V

O(gate)

I

O(gate)

Fast/Trickle Output (Pin 3)

Voltage
Current

Thermal Resistance, Junction–to–Air R

V

O(F/T)

I

O(F/T)

θJA

P Suffix, DIP Plastic Package, Case 626 100

D Suffix, SO–8 Plastic Package, Case 751 178
Operating Junction Temperature T
Operating Ambient Temperature (Note 2) T
Storage Temperature T

NOTE: ESD data available upon request.

J

A

stg

18 V

–1.0 to V

CC

–1.0 to VCC + 0.6

or

–1.0 to 10

20
50

20
50

+150 °C

–25 to +85 °C

–55 to +150 °C

V

mA

V

mA

°C/W

ELECTRICAL CHARACTERISTICS (V

= 6.0 V, for typical values TA = 25°C, for min/max values TA is the operating

CC

ambient temperature range that applies (Note 2), unless otherwise noted.)

Characteristic

BATTERY SENSE INPUT (Pin 1)

Input Sensitivity for –∆V Detection
Overvoltage Threshold

БББББББББББББББББ

Undervoltage Threshold
Input Bias Current
Input Resistance

TIME/TEMPERA TURE INPUTS (Pins 5, 6, 7)

Programing Inputs (Vin = 1.5 V)

БББББББББББББББББ

Input Current

Input Current Matching

БББББББББББББББББ

Input Offset Voltage, Over and Under Temperature Comparators
Under Temperature Comparator Hysteresis (Pin 5)
Temperature Select Threshold

INTERNAL TIMING

Internal Clock Oscillator Frequency
V

Gate Output (Pin 2)

sen

Gate Time

БББББББББББББББББ

Gate Repetition Rate
Fast Charge Holdoff from –∆V Detection

V

GATE OUTPUT (Pin 2)

sen

Off–State Leakage Current (VO = 20 V)
Low State Saturation Voltage (I

sink

= 10 mA)

FAST/TRICKLE OUTPUT (Pin 3)

Off–State Leakage Current (VO = 20 V)
Low State Saturation Voltage (I

NOTES: 1. Whichever voltage is lower.

2.Tested junction temperature range for the MC33340:
T

= –25°C T

low

high

= 10 mA)

sink

= +85°C

Symbol Min Typ Max Unit

–∆V

th

V

th(OV)

ÁÁÁ

V

th(UV)

I

IB

R

in

I

in

ÁÁÁ

∆I

in

ÁÁÁ

V

IO

V

H(T)

V

th(t/T)

f

OSC

t

gate

ÁÁÁ

t

hold

I

off

V

OL

I

off

V

OL

–

1.9

Á

0.95
–
–

Á

–24

–

Á

–
–
–

–

–

Á

–
–

–
–

–
–

–4.0

2.0

ÁÁÁ

1.0
10

6.0

ÁÁÁ

–30

1.0

ÁÁÁ

5.0
44

VCC –0.7

760

33

ÁÁÁ

1.38
177

10

1.2

10

1.0

2.1

Á

1.05

Á

–36

2.0

Á

Á

–

–
–

–
–
–

–

–
–

–

–
–

–
–

ÁÁ

ÁÁ

ÁÁ

ÁÁ

mV

V

mV

nA

MΩ

µA

%
mV
mV
mV

kHz

ms

s
s

nA

V

nA

V

2

MOTOROLA ANALOG IC DEVICE DATA

MC33340

Á

Á

Á

Á

Á

Á

ELECTRICAL CHARACTERISTICS (continued) (V

= 6.0 V, for typical values TA = 25°C, for min/max values TA is the operating

CC

ambient temperature range that applies (Note 2), unless otherwise noted.)

Characteristic UnitMaxTypMinSymbol

UNDERVOLTAGE LOCKOUT (Pin 8)

Start–Up Threshold (VCC Increasing, TA = 25°C)
Turn–Off Threshold (VCC Decreasing, TA = 25°C)

TOTAL DEVICE (Pin 8)

Power Supply Current (Pins 5, 6, 7 Open)

Start–Up (VCC = 2.9 V)

БББББББББББББББББ

Operating (VCC = 6.0 V)

NOTES: 1. Whichever voltage is lower.

2.Tested junction temperature range for the MC33340:
T

= –25°C T

low

high

= +85°C

Figure 1. Battery Sense Input Thresholds

versus T emperature

2.10
VCC = 6.0 V

2.00

1.90

V

th(on)

V

th(off)

I

CC

ÁÁÁ

16

8.0

–

2.75

–

Á

–

3.0

2.85

0.65

ÁÁÁ

0.61

3.1

2.0

Á

2.0

–

Figure 2. Oscillator Frequency

versus T emperature

VCC = 6.0 V

V
V

mA

ÁÁ

1.02

1.00

, OVER/UNDERVOL TAGE THRESHOLDS (V)

th

0.98

V

–50 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

0

–8.0

, OSCILLAT OR FREQUENCY CHANGE (%)

–16

OSC

f

∆

–50 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

MOTOROLA ANALOG IC DEVICE DATA

3

MC33340

V

Figure 3. T emperature Select Threshold Voltage

versus T emperature

0

V

CC

–0.2

0.4

–

–0.6

–0.8

, TEMPERATURE SELECT THRESHOLD VOLTAGE (

–1.0

th(t/T)

V

Threshold voltage is measured with respect to V

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.

–50 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

VCC = 6.0 V

CC

Figure 5. Undervoltage Lockout Thresholds

versus T emperature

3.1
Startup Threshold

3.0

2.9

, SUPPLY VOLTAGE (V)

2.8

CC

V

(VCC Increasing)

Minimum Operating Threshold

(VCC Decreasing)

Figure 4. Saturation V oltage versus Sink Current

V

Gate and Fast/Trickle Outputs

3.2

.

2.4

1.6

0.8

, SINK SATURATION VOLTAGE (V)

OL

V

0

0 8.0 16 24 32 40

sen

VCC = 6.0 V

°

C

TA = 25

V

Gate

sen

Pin 2

I

, SINK SATURATION (mA)

sink

Fast/Trickle
Pin 3

Figure 6. Supply Current

versus Supply V oltage

1.0
TA = 25°C

0.8

0.6

0.4

, SUPPLY CURRENT (mA)

0.2

CC

I

2.7
–50

–25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

0

0 4.0 8.0 12 16

VCC, SUPPLY VOLTAGE (V)

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 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

input that

sen

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.

4

MOTOROLA ANALOG IC DEVICE DATA

DC

Input

Charge

Status

Regulator

Reg Control

R2

R1

MC33340

Figure 7. T ypical Battery Charging Application

MC33340

Undervoltage

Over

Under

4

Lockout

Q

t1

t2

t3

t/T

Time/
Temp
Select

V

sen

1

V

sen

Gate

2

3

Fast/

Trickle

2.0 V

1.0 V

Internal Bias

Voltage to

Frequency

Converter

Battery
Detect

Ck F/V R

High

Low

∆

V Detect

–

Counter

Timer

V

sen

Gate

F/T

Gnd

R
S

Detect

Over
Temp
Latch

Temp

V

8

CC

V

CC

0.7 V

2.9 V

V

CC

30

µ

µ

30

30 µA

Battery

Pack

A

t1/T

High

ref

7

A

t2/T

sen

6

t3/T

Low

ref

5

T

SW1

SW3

R

SW2

NTC

R3

R4

R2+R1

ǒ

V

sen

–1

Ǔ

V

Batt

Figure 8. T ypical Charge Characteristics for NiCd and NiMh Batteries

1.6

1.5

1.4

1.3

CELL VOLTAGE (V)

1.2

1.1

1.0
0 40 80 120 160

Voltage

Temperature

Relative Pressure

CHARGE INPUT PERCENT OF CAP ACITY

V

max

T

max

–∆V

dV

dt

70

60

50

40

30

20

10

°

CELL TEMPERATURE ( C)

MOTOROLA ANALOG IC DEVICE DATA

5

MC33340

OPERA TING DESCRIPTION

The MC33340 starts up in the fast charge mode when
power is applied to VCC. A change to the trickle mode can
occur as a result of three possible conditions. The first is if the
V

input voltage is above 2.0 V or below 1.0 V . Above 2.0 V

sen

indicates that the battery pack is open or disconnected, while
below 1.0 V indicates the possibility of a shorted or defective
cell. The second condition is if a negative slope in battery
voltage is detected after a minimum of 177 seconds of fast
charging. This indicates that the battery pack is fully charged.
The third condition is either due to the battery pack being out
of a programmed temperature range, or that the preset timer
period has been exceeded.

There are three conditions that will cause the controller to
return from trickle to fast charge mode. The first is if the V

sen

input voltage moved to within the 1.0 to 2.0 V range from
initially being either too high or too low. The second is if the
battery pack temperature moved to within the programmed
temperature range, but only from initially being too cold. Third
is by cycling VCC off and then back on causing the internal
logic to reset. A concise description of the major circuit blocks
is given below.

Negative Slope V oltage Detection

A representative block diagram of the negative slope
voltage detector is shown in Figure 9. It includes a
Synchronous Voltage to Frequency Converter, a Sample
Timer , and a Ratchet Counter. The V

pin is the input for the

sen

Voltage to Frequency Converter (VFC), and it connects to the
rechargeable battery pack terminals through a resistive
voltage divider. The input has an impedance of
approximately 6.0 MΩ and a maximum voltage range of
–1.0 V to VCC + 0.6 V or 0 V to 10 V , whichever is lower. The
10 V upper limit is set by an internal zener clamp that
provides protection in the event of an electrostatic discharge.
The VFC is a charge–balanced synchronous type which
generates output pulses at a rate of FV = V

(24 kHz).

sen

The Sample Timer circuit provides a 95 kHz system clock
signal (SCK) to the VFC. This signal synchronizes the F
output to the other Sample Timer outputs used within the
detector. At 1.38 second intervals the V

Gate output goes

sen

low for a 33 ms period. This output is used to momentarily
interrupt the external charging power source so that a precise
voltage measurement can be taken. As the V

Gate goes

sen

low, the internal Preset control line is driven high for 11 ms.
During this time, the battery voltage at the V

sen

input is
allowed to stabilize and the previous FV count is preloaded.
At the Preset high–to–low transition, the Convert line goes
high for 22 ms. This gates the FV pulses into the ratchet
counter for a comparison to the preloaded count. Since the
Convert time is derived from the same clock that controls the
VFC, the number of FV pulses is independent of the clock
frequency. If the new sample has more counts than were
preloaded, it becomes the new peak count and the cycle is
repeated 1.38 seconds later. If the new sample has two fewer
counts, a less than peak voltage event has occurred, and a
register is initialized. If two successive less than peak voltage
events occur, the –∆V ‘AND’ gate output goes high and the
Fast/Trickle output is latched in a low state, signifying that the
battery pack has reached full charge status. Negative slope
voltage detection can only occur after 177 seconds have
elapsed in the fast charge mode. The trickle mode holdoff
time is implemented to ignore any initial drop in voltage that
may occur when charging batteries that have been stored for
an extended time period. The negative slope voltage detector
has a maximum resolution of 2.0 V divided by 1023, or 1.955
mV per count with an uncertainty of ±1.0 count. This yields a
detection range of 1.955 mV to 5.865 mV. In order to obtain
maximum sensing accuracy, the R2/R1 voltage divider must
be adjusted so that the V

input voltage is slightly less than

sen

2.0 V when the battery pack is fully charged. Voltage
variations due to temperature and cell manufacturing must
be considered.

V

V

sen

Input

Synchronous

Voltage to

Frequency

Converter

V

Gate

sen

Preset

Convert

SCK

95 kHz

Figure 9. Negative Slope V oltage Detector

FV = V

11 ms

(24 kHz)

sen

Ck

Convert

Sample

22 ms

Rachet Counter Convert

0 to 1023 FV Pulses

Preset

Timer

Rachet

Counter

Trickle Mode
Holdoff 160s

1.38 s

Battery Detect

∆

V

–

Over Under

V

Gate

sen

Logic

Temperature

UVLOHighLow

Charge

Timer

F/T

6

MOTOROLA ANALOG IC DEVICE DATA

MC33340

Backup

Time Limit

Fast Charge Timer

A programmable backup charge timer is available for fast
charge termination. The timer is activated by the Time/Temp
Select comparator, and is programmed from the t1/T
t2/T

, and t3/T

sen

Low inputs. If one or more of these inputs

ref

is allowed to go above VCC – 0.7 V or is left open, the
comparator output will switch high, indicating that the timer
feature is desired. The three inputs allow one of seven
possible fast charge time limits to be selected. The
programmable time limits, rounded to the nearest whole
minute, are shown in Figure 10.

Over/Under Temperature Detection

A backup over/under temperature detector is available
and can be used in place of the timer for fast charge
termination. The timer is disabled by the Time/Temp Select
comparator when each of the three programming inputs are
held below VCC – 0.7 V.

Temperature sensing is accomplished by placing a
negative temperature coefficient (NTC) thermistor in thermal
contact with the battery pack. The thermistor connects to the
t2/T

input which has a 30 µA current source pull–up for

sen

developing a temperature dependent voltage. The
temperature limits are set by a resistor that connects from the
t1/T

High and the t3/T

ref

Low inputs to ground. Since all

ref

three inputs contain matched 30 µA current source pull–ups,
the required programming resistor values are identical to that
of the thermistor at the desired over and under trip
temperature. The temperature window detector is composed
of two comparators with a common input that connects to the
t2/T

input.

sen

The lower comparator senses the presence of an under
temperature condition. When the lower temperature limit is
exceeded, the charger is switched to the trickle mode. The
comparator has 44 mV of hysteresis to prevent erratic
switching between the fast and trickle modes as the lower
temperature limit is crossed. The amount of temperature rise
to overcome the hysteresis is determined by the thermistor’s
rate of resistance change or sensitivity at the under
temperature trip point. The required resistance change is:

D

R(T

Low

³

T

High

H(T)

)

+

I

in

+

44 mV

30mA

V

The resistance change approximates a thermal hysteresis
of 2°C with a 10 kΩ thermistor operating at 0°C. The under
temperature fast charge inhibit feature can be disabled by
biasing the t3/T

Low input to a voltage that is greater than

ref

Figure 10. Fast Charge Backup T ermination Time/Temperature Limit

Backu

Termination

Mode

Time Open Open Open 283
Time Open Open Gnd 247
Time Open Gnd Open 212
Time Open Gnd Gnd 177
Time Gnd Open Open 141
Time Gnd Open Gnd 106
Time Gnd Gnd Open 71

Temperature 0 V to VCC – 0.7 V 0 V to VCC – 0.7 V 0 V to VCC – 0.7 V Timer Disabled

t3/T

Low

ref

(Pin 5)

High,

ref

+

1.46 k

Programming Inputs

that present at t2/T

, and less than VCC – 0.7 V. Under

sen

extremely cold conditions, it is possible that the thermistor
resistance can become too high, allowing the t2/T
go above VCC – 0.7 V , and activate the timer . This condition
can be prevented by placing a resistor in parallel with the
thermistor. Note that the time/temperature threshold of V
– 0.7 V is a typical value at room temperature. Refer to the
Electrical Characteristics table and to Figure 3 for additional
information.

The upper comparator senses the presence of an over
temperature condition. When the upper temperature limit is
exceeded, the comparator output sets the Over Temperature
Latch and the charger is switched to trickle mode. Once the
latch is set, the charger cannot be returned to fast charge,
even after the temperature falls below the limit. This feature
prevents the battery pack from being continuously
temperature cycled and overcharged. The latch can be reset
by removing and reconnecting the battery pack or by cycling
the power supply voltage.

If the charger does not require either the time or
temperature backup features, they can both be easily
disabled. This is accomplished by biasing the t3/T
input to a voltage greater than t2/T
t1/T

High input. Under these conditions, the Time/Temp

ref

, and by grounding the

sen

Select comparator output is low, indicating that the
temperature mode is selected, and that the t2/T
biased within the limits of an artificial temperature window.

Charging of battery packs that are used in portable power
tool applications typically use temperature as the only means
for fast charge termination. The MC33340 can be configured
in this manner by constantly resetting the –∆V detection
logic. This is accomplished by biasing the V
≈1.5 V from a two resistor divider that is connected between
the positive battery pack terminal and ground. The V
output is also connected to the V
that the Sample Timer causes the V
V

input will be pulled below the undervoltage threshold of

sen

input. Now, each time

sen

output to go low, the

sen

1.0 V. This causes a reset of the –∆V logic every 1.38
seconds, thus disabling detection.

Operating Logic

The order of events in the charging process is controlled
by the logic circuitry . Each event is dependent upon the input
conditions and the chosen method of charge termination. A
table summary containing all of the possible operating modes
is shown in Figure 1 1.

t2/T

sen

(Pin 6)

t1/T

High

ref

(Pin 7)

Time Limit

Fast Charge

(Minutes)

sen

sen

sen

input to

CC

Low

ref

input is

input to

Gate

sen

MOTOROLA ANALOG IC DEVICE DATA

7

MC33340

Figure 11. Controller Operating Mode Table

Input Condition Controller Operation

V

Input Voltage:

sen

>1.0 V and <2.0 V

>1.0 V and <2.0 V with
two consecutive –∆V
events detected after 160 s

<1.0 V or >2.0 V The divided down battery pack voltage is outside of the fast charge voltage range. The charger switches

Timer Backup:

Within time limit

Beyond time limit The timer has exceeded the programmed limit. The charger switches from fast to a latched trickle mode.

T emperature Backup:

Within limits

Below lower limit The battery pack temperature is below the programmed lower limit. The charger will stay in trickle mode

Above upper limit The battery pack temperature has exceeded the programmed upper limit. The charger switches from fast

Power Supply Voltage:

VCC >3.0 V and <18 V

VCC >0.6 V and <2.8 V The undervoltage lockout comparator will be activated and the charger will be in trickle mode. A reset

The divided down battery pack voltage is within the fast charge voltage range. The charger switches from
trickle to fast charge mode as V
timer and the over temperature latch.

The battery pack has reached full charge and the charger switches from fast to a latched trickle mode.
A reset pulse must be applied for the charger to switch back to the fast mode. The reset pulse occurs
when entering the 1.0 V to 2.0 V window for V

from fast to trickle mode.

The timer has not exceeded the programmed limit. The charger will be in fast charge mode if V
VCC are within their respective operating limits.

The battery pack temperature is within the programmed limits. The charger will be in fast charge mode if
V

and VCC are within their respective operating limits.

sen

until the lower temperature limit is exceeded. When exceeded, the charger will switch from trickle to fast
charge mode.

to a latched trickle mode. A reset signal must be applied and then released for the charger to switch back
to the fast charge mode. The reset pulse occurs when entering the 1.0 V to 2.0 V window for V
when VCC rises above 3.0 V.

This is the nominal power supply operating voltage range. The charger will be in fast charge mode if
V

, and temperature backup or timer backup are within their respective operating limits.

sen

signal is applied to the timer and over temperature latch.

enters this voltage range, and a reset pulse is then applied to the

sen

or when VCC rises above 3.0 V.

sen

sen

sen

and

or

T esting

Under normal operating conditions, it would take 283
minutes to verify the operation of the 34 stage ripple counter
used in the timer. In order to significantly reduce the test time,
three digital switches were added to the circuitry and are
used to bypass selected divider stages. Entering each of the
test modes without requiring additional package pins or
affecting normal device operation proved to be challenging.
Refer to the timer functional block diagram in Figure 12.

Switch 1 bypasses 19 divider stages to provide a 524,288
times speedup of the clock. This switch is enabled when the
V

input falls below 1.0 V. Verification of the programmed

sen

fast charge time limit is accomplished by measuring the
propagation delay from when the V

input falls below 1.0 V ,

sen

to when the F/T output changes from a high–to–low state.
The 71, 106, 141, 177, 212, 247 and 283 will now correspond
to 8.1, 12.1, 16.2, 20.2, 24.3, 28.3 and 32.3 ms delays. It is
possible to enter this test mode during operation if the
equivalent battery pack voltage was to fall below 1.0 V. This
will not present a problem since the device would normally
switch from fast to trickle mode under these conditions, and
the relatively short variable time delay would be transparent
to the user.

Switch 2 bypasses 11 divider stages to provide a 2048
times speedup of the clock. This switch is necessary for
testing the 19 stages that were bypassed when switch 1 was
enabled. Switch 2 is enabled when the V

1.0 V and the t1/T

High input is biased at –100 mV.

ref

input falls below

sen

Verification of the 19 stages is accomplished by measuring a
nominal propagation delay of 338.8 ms from when the V

sen

input falls below 1.0 V, to when the F/T output changes from
a high–to–low state.

Switch 3 is a dual switch consisting of sections “A” and “B”.
Section “A” bypasses 5 divider stages to provide a 32 times
speedup of the V

gate signal that is used in sampling the

sen

battery voltage. This speedup allows faster test verification of
two successive –∆V events. Section “B” bypasses 11 divider
stages to provide a 2048 speedup of the trickle mode holdoff
timer. Switches 3A and 3B are both activated when the t1/T

ref

High input is biased at –100 mV with respect to Pin 4.
Activation results in a reduction of the V

gate sample rate

sen

from 1.38 s to 43 ms, and a trickle mode holdoff time of 177 s
to 86 ms.

8

MOTOROLA ANALOG IC DEVICE DATA

Switch 2

11

2

MC33340

Figure 12. Timer Functional Block Diagram

Switch 1

19

Switch 3A

5

2

2

Oscillator

760 kHz

Each test mode bypass switch is shown
in the proper position for normal charger operation.

3

÷

2

95 kHz

SCK

Voltage to

Frequency

Converter

8

÷

2

Decoder

to

11 ms

Preset

Figure 13. Line Isolated Linear Regulator Charger

R5

1.0 k

D3

AC

Line

Input

DC

Input

R6

1.8 k
D1

Charge

Status

R2

I

chg(fast)

I

chg(trickle)

+

LM317

IC2

I

Adj

R1

+

D4

V

Batt

ǒ

V

sen

V

+

1N4002

D2

R7

2.4

R8

220

–1

)

(I

ref

R7

Vin–V

4

÷

2

22 ms
Convert

R2

R1

Ǔ

R8)

Adj

f(D3)–VBatt

R5

1

÷

2

V

sen

C1

0.01

V

sen

Gate

Fast/

Trickle

4

÷

2

V

Switch 3B

86 ms 177 s

Internal Bias

1

2.0 V

1.0 V

2

3

1.38 s
Gate

sen

11

2

Trickle

Handoff

Voltage to

Frequency

Converter

Battery
Detect

7

÷

2

Ck F/V R
High

Low

∆

–

V

sen

Gate

F/T

Gnd

3

÷

2

23.5 47.1 94.2

IC1 MC33340

Undervoltage

Over

Under

t1

V Detect

Counter

Timer

t2

t3

t/T

4

÷2÷2÷2÷

Time Period Minutes

Time and Test

Decoder

Timer Output

V

CC

Lockout

Over
Temp
Latch

R

Q

S

Temp

Detect

Time/Temp

Select

188.4

8

0.6 V

V

CC

2.9 V

V

CC

30

30

30

2

376.8

µ

A

µ

A

µ

A

C2

0.1

t1/T

7

t2/T

6

t3/T

5

t1/T
t2/T

t3/T

Battery

High

ref

sen

Low

ref

ref
sen

ref

Pack

SW1

SW3

High

Low

R
10 k

SW2

NTC

R3

R4

This application combines the MC33340 with an adjustable three terminal regulator to form an isolated secondary side battery charger. Regulator IC2 operates as
a constant current source with R7 setting the fast charge level. The trickle charge level is set by R5. The R2/R1 divider should be adjusted so that the V
less than 2.0 V when the batteries are fully charged. The printed circuit board shown below will accept the several TO–220 style heatsinks for IC2 and are all
manufactured by AAVID Engineering Inc.

AAVID # θSA °C/W
592502B03400 24.0
593002B03400 14.0
590302B03600 9.2

MOTOROLA ANALOG IC DEVICE DATA

sen

input is

9

Input
Return

Input
Positive

Input

R5

MC33340

Figure 14. Printed Circuit Board and Component Layout

(Circuit of Figure 13)

Charge Mode

R

C2

R7

NTC

Output

D2

D1

R6

IC2

D4

D3

R4

R1

C1

321

R3

IC1

R2
R8

(Top View) (Bottom View)

Figure 15. Line Isolated Switch Mode Charger

V

CC

R2

R1

OC2

Voltage

Feedback

Input

2
1

Output/

Compensation

V

Battery

Battery
Negative

R

NTC

R

NTC

Battery
Positive

Error

Amplifier

Primary Circuitry

Isolation Boundary

UC3842 Series

1.0 mA
2R

1.70

″

R

1.0 V
Current Sense

Gnd 5

Secondary Circuitry

Comparator

2.25

″

MC33340

MC33340

V

sen

Gate

R3

OC1

V

sen

Gate

2

3

Fast/

Trickle

F/T

Gnd 4

The MC33340 can be combined with any of the devices in the UC3842 family of current mode controllers to form a switch mode battery charger. In this example,
optocouplers OC1 and OC2 are used to provide isolated control signals to the UC3842. During battery voltage sensing, OC2 momentarily grounds the
Output/Compensation pin, effectively turning off the charger . When fast charge termination is reached, OC1 turns on, and grounds the lower side of R3. This reduces
the peak switch current threshold of the Current Sense Comparator to a programmed trickle current level. For additional converter design information, refer to the
UC3842 and UC3844 device family data sheets.

10

MOTOROLA ANALOG IC DEVICE DATA

MC33340

Figure 16. Switch Mode Fast Charger

MC34166 or MC34167

I

Limit

Osc

PWM

Thermal

Gnd 3 Compensation 5

S

Q

R

UVLO

Ref

EA

C1 R3

V

sen

Gate

2

3

Fast/

Trickle

V

CC

+

4

Switch
Output

2

Voltage
Feedback
Input

1

R1

MC33340

R2

Battery

Pack

V

sen

Gate

F/T

AC

Line

Input

R4

Gnd 4

The MC33340 can be used to control the MC34166 or MC34167 power switching regulators to produce an economical and efficient fast charger. These devices are
capable of operating continuously in current limit with an input voltage range of 7.5 to 40 V . The typical charging current for the MC34166 and MC34167 is 4.3 A and

6.5 A respectively. Resistors R2 and R1 are used to set the battery pack fast charge float voltage. If precise float voltage control is not required, components R1, R2,
R3 and C1 can be deleted, and Pin 1 must be grounded. The trickle current level is set by resistor R4. It is recommended that a redundant charge termination method
be employed for end user protection. This is especially true for fast charger systems. For additional converter design information, refer to the MC34166 and MC34167
data sheets.

MOTOROLA ANALOG IC DEVICE DATA

11

NOTE 2

A

B

C

A1

–T–

SEATING
PLANE

H

E

58

14

F

–A–

N

D

G

0.13 (0.005) B

D

58

1

H

4

e

A

B

SS

A0.25MCB

–B–

C

K

M

T

0.25MB

SEATING
PLANE

0.10

MC33340

OUTLINE DIMENSIONS

P SUFFIX

PLASTIC PACKAGE

CASE 626–05

ISSUE K

L

J

M

M

A

M

D SUFFIX

PLASTIC PACKAGE

CASE 751–05

(SO–8)

ISSUE R

M

h

X 45

_

q

C

L

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

DIM MIN MAX MIN MAX

A 9.40 10.16 0.370 0.400
B 6.10 6.60 0.240 0.260
C 3.94 4.45 0.155 0.175
D 0.38 0.51 0.015 0.020
F 1.02 1.78 0.040 0.070
G 2.54 BSC 0.100 BSC
H 0.76 1.27 0.030 0.050
J 0.20 0.30 0.008 0.012
K 2.92 3.43 0.115 0.135
L 7.62 BSC 0.300 BSC
M ––– 10 ––– 10
N 0.76 1.01 0.030 0.040

NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.

2. DIMENSIONS ARE IN MILLIMETERS.

3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.

5. DIMENSION B DOES NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.

MILLIMETERS

DIM MIN MAX

A 1.35 1.75

A1 0.10 0.25

B 0.35 0.49
C 0.18 0.25
D 4.80 5.00
E

3.80 4.00

1.27 BSCe

H 5.80 6.20
h

0.25 0.50

L 0.40 1.25

0 7

q

INCHESMILLIMETERS

__

__

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.

Mfax is a trademark of Motorola, Inc.

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12

◊

MOTOROLA ANALOG IC DEVICE DATA

MC33340/D