© Semiconductor Components Industries, LLC, 2005

July, 2005 − Rev. 7

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Publication Order Number:

MC33340/D

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.

Figure 1. Simplified Block Diagram

This device contains 2,512 active transistors.

DC

Input

Undervoltage

Lockout

Over

Temp

Latch

Battery

Detect

Temp

Detect

Time/

Temp Select

Gate

Fast/

Trickle

Voltage to

Frequency

Converter

−

DV Detect

Counter

Timer

Battery

Pack

Internal Bias

GND

Q

R

S

7

6

5

8

4

3

2

1

High

Low

Gate

F/T

Over

Under

t1

t2

t3

t/T

Ck

F/V

R

PDIP−8

P SUFFIX

CASE 626

1

8

SOIC−8

NB SUFFIX

CASE 751

1

8

MARKING

DIAGRAMS

x

= 0 or 2

A

= Assembly Location

L

= Wafer Lot

Y

= Year

W

= Work Week

G

= Pb−Free Package

1

8

MC3334xP

AWL

YYWW

(Top View)

PIN CONNECTIONS

8

Fast/Trickle Output

Gnd

7

6

5

1

2

3

4

See detailed ordering and shipping information in the package

dimensions section on page 13 of this data sheet.

ORDERING INFORMATION

http://onsemi.com

3334x

ALYWX

G

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