sc1766cs14 Semtech Corporation, sc1766cs14 Datasheet

sc1766cs14

Manufacturer Part Number

sc1766cs14

Description

Battery Charge Controller

Manufacturer

Semtech Corporation

Datasheet

1.SC1766CS14.pdf (11 pages)

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Janaury 30, 1998

DESCRIPTION

The SC1766 fast charge controller IC is designed for

intelligent charging of NiMH or NiCd batteries without

overcharging. It detects a voltage drop (- V) occurring

in the final stage of a fast charging cycle and

correspondingly controls the charging current. Fast

charge can also be cut off by a peak voltage timer

(0 V).

The detection of - V is a very reliable method to

terminate fast charging for NiMH and NiCd batteries.

The SC1766 uses - V detection as one of the primary

decisions for fast charge cut-off. The - V value of the

SC1766 is as small as 4mV per cell, particularly

suitable for NiMH as well as NiCd batteries. The peak

voltage timer is particularly useful when the voltage

drop at the end of charge for some batteries, e.g.

NiMH cells, is not pronounced enough for reliable

detection. An adjustable safety timer (3 settings) is

used as a backup termination method. Provisions are

made with the SC1766 to prevent fast charge under

temperature fault conditions. Two LED outputs are

used to indicate the charging status. Another flash LED

output can be used alone to indicate charge status.

AC mode allows the battery to drive its loads while

being charged. Test mode is provided to dramatically

reduce production test time.

APPLICATIONS

Battery chargers for:

Mobile phones

Notebook and laptop personal computers

Portable power tools and toys

Portable communications equipment

Portable video and stereo equipment

BATTERY

CHARGE CONTROLLER

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

652 MITCHELL ROAD NEWBURY PARK CA 91320

FEATURES

ORDERING INFORMATION

SC1766CS08

SC1766CS14

Note:

(1) Add suffix ‘TR’ for tape and reel.

ABSOLUTE MAXIMUM RATINGS

Parameter

Supply Voltage

DC Voltage Applied

to any Pin

Sink Current of V

pin, LED pin, and

FLASH pin

Operating

Temperature Range

Storage

Temperature Range

DEVICE

Reliable fast charge control of NiMH/NiCd

batteries

Fast charge termination by:

Adjustable fast charge safety timer

Protection against temperature fault

Protection against short-circuited and open

batteries

Wide operation voltage range of 9V to 18V, no

extra regulator needed

Large battery voltage detection range of 0.65V to

3.7V

LED drivers to indicate charge status or fault

conditions

Voltage reference output

Quick and easy testing for production

Space saving 8-pin and 14-pin SO packages

Accurate - V detection level -0.25% with

respect to peak value

Peak voltage timer (0 V)

(1)

OUT

Symbol

STG

PACKAGE

SO-14

SO-8

Maximum

-65 to 150

0 to 70

SC1766

Units

°C

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sc1766cs14 Summary of contents

Page 1

... Voltage reference output Quick and easy testing for production Space saving 8-pin and 14-pin SO packages ORDERING INFORMATION (1) DEVICE SC1766CS08 SC1766CS14 Note: (1) Add suffix ‘TR’ for tape and reel. ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage DC Voltage Applied to any Pin Sink Current of V ...

Page 2

Janaury 30, 1998 ELECTRICAL CHARACTERISTICS Unless otherwise specified 25º Parameter Supply Voltage Supply Current - V detection level w.r.t. peak value Voltage protection limits battery low battery high Input impedance of TIMER pin Input impedance of ...

Page 3

Janaury 30, 1998 TYPICAL APPLICATIONS Step-Down High-Side Current Sense Battery Charger NOTE: RSENSE = 0.1 ohm, CHARGE CURRENT = 0.5A ±10%, V RSENSE = 0.05 ohm, CHARGE CURRENT = 1.0A ±10%, V RSENSE = 0.033 ohm, CHARGE CURRENT = 1.5A ...

Page 4

Janaury 30, 1998 TYPICAL APPLICATIONS (cont.) Step-Up Rechargeable Battery Charger ** CHARGING CURRENT = 0.8A, AUTO CUT-OFF AT 0.25% - DELTA-V POINT AND FAULT CONDITIONS (RIF SETS THE CHARGING CURRENT MUST BE LOWER THAN VBAT SHORT ...

Page 5

Janaury 30, 1998 TYPICAL APPLICATIONS (cont.) Step Down Low-Side Current Sense Battery Charger FINAL VOLTAGE Discharge Circuit of OF BATTERY Rechargeable Battery NOTE: The final voltage of battery is determined by R26. Discharge current is decided by R5. S1: Push ...

Page 6

Page 7

Janaury 30, 1998 PRINCIPLES OF OPERATION Battery Properties The basic principle of rechargeable battery systems, including NiMH and NiCd cells, is that the processes of charge and discharge are reversible. The charge char- acteristics of NiMH and NiCd cells look ...

Page 8

Janaury 30, 1998 PRINCIPLES OF OPERATION (cont.) MODE PIN The MODE pin determines the mode in which the IC works: MODE Mode Function Floating NORMAL normal operation VDD TEST 1/512 safety timer GND detector reset timer stops ...

Page 9

Janaury 30, 1998 PRINCIPLES OF OPERATION (cont detector of the SC1766 to work properly in test mode, which is that the VBT voltage must be kept be- tween approximately 2.8V to 3.3V, rather than 0.8V to 3.5V in ...

Page 10

Janaury 30, 1998 PRINCIPLES OF OPERATION (cont.) Battery Voltage Divider To ensure proper operation of the SC1766, selection of resistor values for the battery voltage divider must meet the following two crucial requirements: 1. When the battery pack is disconnected ...

Page 11

Janaury 30, 1998 CHARGER CIRCUIT DESIGN TIPS 1. A stable constant charge current is crucial for reli- able precision - V detection by the SC1766 since fluc- tuation of the charge current can cause fluctuation of the battery terminal voltage ...

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