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)

(Top View)

PIN CONNECTIONS

Order this document by MC33340/D

sen

Input

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

MC33340P Plastic DIP

MC33342D SO–8

MC33342P Plastic DIP

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.

Input

Undervoltage Lockout

Over T emp Latch

Battery Detect

T emp Detect

Time/ T emp Select

sen

Gate

Fast/

Trickle

Voltage to

Frequency

Converter

–

∆

V Detect

Counter

Timer

Battery

Pack

Internal Bias

Gnd

R S

t1/T

ref

High

t2/T

sen

t3/T

ref

Low

High

Low

sen

Gate

F/T

Over

Under

t/T

Ck F/V R

Regulator

 Motorola, Inc. 1999 Rev 3

MC33340 MC33342

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage (Pin 8) V

18 V

Input Voltage Range V

Time/Temperature Select (Pins 5, 6, 7) V

IR(t/T)

–1.0 to V

Battery Sense, Note 1 (Pin 1) V

IR(sen)

–1.0 to VCC + 0.6 or –1.0 to 10

sen

Gate Output (Pin 2) Voltage Current

O(gate)

20 50

Fast/Trickle Output (Pin 3)

Voltage Current

O(F/T)

20 50

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

+150 °C

Operating Ambient Temperature (Note 2) T

–25 to +85 °C

Storage Temperature T

stg

–55 to +150 °C

NOTE: ESD data available upon request.

ELECTRICAL CHARACTERISTICS (V

= 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

–

–4.0

–

Overvoltage Threshold

th(OV)

1.9

2.0

2.1

Undervoltage Threshold

th(UV)

0.95

1.0

1.05

Input Bias Current

–

Input Resistance

–

6.0

–

MΩ

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

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Programing Inputs (Vin = 1.5 V)

Input Current Input Current Matching

ÁÁÁ

∆I

–24

–

ÁÁÁ

–30

1.0

–36

2.0

ÁÁ

µA

Input Offset Voltage, Over and Under Temperature Comparators

–

5.0

–

Under Temperature Comparator Hysteresis (Pin 5)

H(T)

–

Temperature Select Threshold

th(t/T)

–

VCC –0.7

–

INTERNAL TIMING

Internal Clock Oscillator Frequency

OSC

–

760

–

kHz

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sen

Gate Output (Pin 2) Gate Time Gate Repetition Rate

ÁÁÁ

gate

– –

ÁÁÁ

1.38

– –

ÁÁ

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Fast Charge Holdoff from –∆V Detection

MC33340 MC33342

ÁÁÁ

hold

– –

ÁÁÁ

177 708

– –

ÁÁ

sen

GATE OUTPUT (Pin 2)

Off–State Leakage Current (VO = 20 V)

off

–

Low State Saturation Voltage (I

sink

= 10 mA)

–

1.2

–

FAST/TRICKLE OUTPUT (Pin 3)

Off–State Leakage Current (VO = 20 V)

off

–

Low State Saturation Voltage (I

sink

= 10 mA)

–

1.0

–

UNDERVOLTAGE LOCKOUT (Pin 8)

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

th(on)

–

3.0

3.1

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

th(off)

2.75

2.85

–

TOTAL DEVICE (Pin 8)

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

Start–Up (VCC = 2.9 V) Operating (VCC = 6.0 V)

ÁÁÁ

– –

ÁÁÁ

0.65

0.61

2.0

ÁÁ

NOTES: 1. Whichever voltage is lower.

2.Tested junction temperature range for the MC33340/342: T

low

= –25°CT

high

= +85°C

MC33340 MC33342

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)

, OVER/UNDERVOL TAGE THRESHOLDS (V)

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

8.0

–8.0

–16

–50 –25 0 25 50 75 100 125

VCC = 6.0 V

sink

, SINK SATURATION (mA)

Figure 3. Temperature Select Threshold Voltage

versus Temperature

Figure 4. Saturation Voltage versus Sink Current

sen

Gate and Fast/Trickle Outputs

TA, AMBIENT TEMPERATURE (°C)

th(t/T)

, TEMPERATURE SELECT THRESHOLD VOLTAGE (

, SINK SATURATION VOLTAGE (V)

–50 –25 0 25 50 75 100 125

–0.2

–

0.4

–0.6

–0.8

–1.0

VCC = 6.0 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.

Threshold voltage is measured with respect to V

3.2

0 8.0 16 24 32 40

2.4

1.6

0.8

VCC = 6.0 V TA = 25

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)

, SUPPLY VOLTAGE (V)

, 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

TA = 25°C

MC33340 MC33342

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

Undervoltage

Lockout

Over Temp Latch

Battery Detect

Temp

Detect

Time/ Temp Select

sen

Gate

Fast/

Trickle

Voltage to

Frequency

Converter

–

∆

V Detect

Counter

Timer

Battery

Pack

Internal Bias

Gnd

R S

t1/T

ref

High

t2/T

sen

t3/T

ref

Low

High

Low

sen

Gate

F/T

Over

Under

t/T

Ck F/V R

Regulator

Reg Control

Input

Charge

Status

MC33340 or MC33342

2.0 V

1.0 V

NTC

SW2

SW1

SW3

2.9 V

0.7 V

R2+R1

Batt

sen

–1

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