Motorola MC33340P, MC33340D Datasheet

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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

CASE 626

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

Input

∆

V Detect

Counter

Timer

Undervoltage Lockout

Over

Under

t/T

Time/ Temp Select

Regulator

Internal Bias

sen

Gate

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

Over Temp Latch

Temp Detect

Battery

Pack

t1/T

High

ref

7 t2/T

sen 6 t3/T

Low

ref 5

PIN CONNECTIONS

Input

sen

Gate Output

sen

Fast/Trickle Output

Gnd

1 2 3 4

(Top View)

t1/T

High

ref

t2/T

sen

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

MC33340

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage (Pin 8) V

Input Voltage Range V

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

Gate Output (Pin 2)

sen

Voltage Current

IR(t/T)

IR(sen)

O(gate)

Fast/Trickle Output (Pin 3)

Voltage Current

Thermal Resistance, Junction–to–Air R

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.

stg

18 V

–1.0 to V

–1.0 to VCC + 0.6

–1.0 to 10

20 50

+150 °C

–25 to +85 °C

–55 to +150 °C

°C/W

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

BATTERY SENSE INPUT (Pin 1)

Input Sensitivity for –∆V Detection Overvoltage Threshold

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Undervoltage Threshold Input Bias Current Input Resistance

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

Programing Inputs (Vin = 1.5 V)

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Input Current

Input Current Matching

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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

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(OV)

ÁÁÁ

th(UV)

ÁÁÁ

∆I

ÁÁÁ

H(T)

th(t/T)

OSC

gate

ÁÁÁ

hold

off

–

1.9

0.95 – –

–24

–

– – –

–

– –

–4.0

2.0

ÁÁÁ

1.0 10

6.0

ÁÁÁ

–30

1.0

ÁÁÁ

5.0 44

VCC –0.7

760

ÁÁÁ

1.38 177

1.2

1.0

2.1

1.05

–36

2.0

–

– –

– – –

–

– –

–

– –

ÁÁ

MΩ

µA

% mV mV mV

kHz

s s

MOTOROLA ANALOG IC DEVICE DATA

MC33340

ELECTRICAL CHARACTERISTICS (continued) (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 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)

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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

th(on)

th(off)

ÁÁÁ

8.0

–

2.75

–

3.0

2.85

0.65

ÁÁÁ

0.61

3.1

2.0

–

Figure 2. Oscillator Frequency

versus T emperature

VCC = 6.0 V

V V

ÁÁ

1.02

1.00

, OVER/UNDERVOL TAGE THRESHOLDS (V)

0.98

–50 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

–8.0

, OSCILLAT OR FREQUENCY CHANGE (%)

–16

OSC

∆

–50 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

MOTOROLA ANALOG IC DEVICE DATA

MC33340

Figure 3. T emperature Select Threshold Voltage

versus T emperature

–0.2

0.4

–

–0.6

–0.8

, TEMPERATURE SELECT THRESHOLD VOLTAGE (

–1.0

th(t/T)

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

Figure 5. Undervoltage Lockout Thresholds

versus T emperature

3.1 Startup Threshold

3.0

2.9

, SUPPLY VOLTAGE (V)

2.8

(VCC Increasing)

Minimum Operating Threshold

(VCC Decreasing)

Figure 4. Saturation V oltage versus Sink Current

Gate and Fast/Trickle Outputs

3.2

2.4

1.6

0.8

, SINK SATURATION VOLTAGE (V)

0 8.0 16 24 32 40

sen

VCC = 6.0 V

TA = 25

Gate

sen

Pin 2

, 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

2.7 –50

–25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

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.

MOTOROLA ANALOG IC DEVICE DATA

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