PT8A2704AWEX

PT8A2704AWEX Datasheet

PT8A2704/04A

Part	Datasheet
PT8A2704AWEX	PT8A2704AWEX (pdf)

Related Parts	Information
PT8A2704PEX	PT8A2704PEX
PT8A2704AWE	PT8A2704AWE
PT8A2704PE	PT8A2704PE

PDF Datasheet Preview
PT8A2704/04A Simple Fast Charger Controller Product Features Product Description • Fast charge of nickel cadmium NiCd or nickelmetal hydride NiMH batteries • Fast-charge termination by negative delta voltage, maximum voltage, maximum temperature, and 90 minutes charging time • Support 1 to 8 cells fast charging • 10% PT8A2704 or 4% PT8A2704A of constant charging current for trickle charging • On-chip 2.0V regulator • On chip precise ADC • Internal RC oscillator with external R&C components • Low cost 8-pin DIP/SOIC package • Rechargeable shavers and hair cutters • Rechargeable RC cars • Rechargeable power tools The PT8A2704/04A Fast-Charger IC is low-cost CMOS battery-charge controller providing reliable charge termination for both NiCd and NiMH battery applications, such as Power tool and Consumer electronics. A current-limited or supply allows the PT8A2704/04A to be a cost-effective charger with only a few external components. The PT8A2704/04A has programmable charging time and programmable trickle charging rate control by options in a single IC for charging NiCd or NiMH battery cells. For safety, fast or trickle charging is inhibited if the battery temperature is over a safety threshold. Fast charge is terminated by any of the following: - Negative delta voltage/zero delta voltage - Maximum voltage - Maximum temperature - Maximum time Pin Assignment and Pin Description PT8A2704/04A DIP-8 or SOIC-8 Package Top View Pin Description No. Name 1 GND - Power ground I Battery voltage input 1.6V 1.8V I NTC voltage input 1.6V 1.8V 4 OSC RC oscillator input, external resistor pull-up and capacitor pull-down 5 CORD I Cord detection input 6 VCC - Positive power supply voltage 7 CHARGE O Charging control enable 8 VEE O 2.0v regulated voltage 12-07-0005 PT0199-8 07/05/12 1 PT8A2704/04A Simple Fast Charger Controller Block Diagram Functional Description Voltage Regulator 2.0V Regulator Build-in voltage regulator used to power supply RC oscillator, precise ADC. Oscillator Internal RC oscillator to generate a 64 kHz clock for internal system. POR Power-on Reset Power on reset to reset all internal logic while power on. Charging Control Charging control enables output CHARGE pin which can be used to show charging status. It is logic high during constant current charging and 12.5Hz with 10% for PT8A2704 or 4% for PT8A2704A duty cycle during trickle current charging AC Cord Control CORD input is external cord detection pin digital level , active high. Precision ADC VB measures the battery voltage. VB is a divide voltage from the battery voltage. When VB exceeds the maximum voltage 0.9VEE , fast charging will be terminated. Moreover, VB detects the negative delta voltage during fast charging. It is suggested to set the termination voltage of VB within the input range of the ADC which is 0.8VEE to 0.9VEE. VT measures the temperature of the battery with an external NTC refer to How to determine RX1 on page5 . Maximum temperature termination occurs when the VT exceeds a temperature cut-off threshold voltage eg. which equivalent to 0.887VEE . Constant current or trickle charging will stop completely when the temperature exceeds another threshold voltage eg. which equivalent to 0.897VEE . Charging Cycle Phases No charging CO RD CHA RG E Fast charging P ul s e-tri c k l e Stop charging Ordering Information Package Code PT8A2704PE PT8A2704WE PT8A2704APE* PT8A2704AWE* E = Pb-free or Pb-free and Green Adding X Suffix= Tape/Reel *Contact Pericom for availability. Package Lead free 8-Pin DIP Lead free and Green 8-Pin SOIC Lead free 8-Pin DIP Lead free and Green 8-Pin SOIC Pericom Semiconductor Corporation  1-800-435-2336  Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom. 12-07-0005 PT0199-8 07/05/12 7

PDF Datasheet Preview

PT8A2704/04A

Simple Fast Charger Controller

Product Features

Product Description
• Fast charge of nickel cadmium NiCd or nickelmetal hydride NiMH batteries
• Fast-charge termination by negative delta voltage, maximum voltage, maximum temperature, and 90 minutes charging time
• Support 1 to 8 cells fast charging
• 10% PT8A2704 or 4% PT8A2704A of constant
charging current for trickle charging
• On-chip 2.0V regulator
• On chip precise ADC
• Internal RC oscillator with external R&C
components
• Low cost 8-pin DIP/SOIC package
• Rechargeable shavers and hair cutters
• Rechargeable RC cars
• Rechargeable power tools

The PT8A2704/04A Fast-Charger IC is low-cost CMOS battery-charge controller providing reliable charge termination for both NiCd and NiMH battery applications, such as Power tool and Consumer electronics. A current-limited or supply allows the PT8A2704/04A to be a cost-effective charger with only a few external components. The PT8A2704/04A has programmable charging time and programmable trickle charging rate control by options in a single IC for charging NiCd or NiMH battery cells.

For safety, fast or trickle charging is inhibited if the battery temperature is over a safety threshold. Fast charge is terminated by any of the following:
- Negative delta voltage/zero delta voltage - Maximum voltage - Maximum temperature - Maximum time

Pin Assignment and Pin Description

PT8A2704/04A DIP-8 or SOIC-8 Package Top View

Pin Description

No. Name
1 GND
- Power ground

I Battery voltage input 1.6V 1.8V

I NTC voltage input 1.6V 1.8V
4 OSC

RC oscillator input, external resistor pull-up and capacitor pull-down
5 CORD

I Cord detection input
6 VCC
- Positive power supply voltage
7 CHARGE O Charging control enable
8 VEE

O 2.0v regulated voltage
12-07-0005

PT0199-8 07/05/12 1

PT8A2704/04A Simple Fast Charger Controller

Block Diagram

Functional Description

Voltage Regulator 2.0V Regulator Build-in voltage regulator used to power supply RC oscillator, precise ADC. Oscillator Internal RC oscillator to generate a 64 kHz clock for internal system. POR Power-on Reset Power on reset to reset all internal logic while power on. Charging Control Charging control enables output CHARGE pin which can be used to show charging status. It is logic high during constant current charging and 12.5Hz with 10% for PT8A2704 or 4% for PT8A2704A duty cycle during trickle current charging AC Cord Control CORD input is external cord detection pin digital level , active high. Precision ADC VB measures the battery voltage. VB is a divide voltage from the battery voltage. When VB exceeds the maximum voltage 0.9VEE , fast charging will be terminated. Moreover, VB detects the negative delta voltage during fast charging. It is suggested to set the termination voltage of VB within the input range of the ADC which is 0.8VEE to 0.9VEE. VT measures the temperature of the battery with an external NTC refer to How to determine RX1 on page5 . Maximum temperature termination occurs when the VT exceeds a temperature cut-off threshold voltage eg. which equivalent to 0.887VEE . Constant current or trickle charging will stop completely when the temperature exceeds another threshold voltage eg. which equivalent to 0.897VEE .

Charging Cycle Phases

No charging CO RD CHA RG E

Fast charging

P ul s e-tri c k l e

Stop charging
Ordering Information

Package Code

PT8A2704PE

PT8A2704WE

PT8A2704APE*

PT8A2704AWE*

E = Pb-free or Pb-free and Green

Adding X Suffix= Tape/Reel
*Contact Pericom for availability.

Package

Lead free 8-Pin DIP Lead free and Green 8-Pin SOIC Lead free 8-Pin DIP Lead free and Green 8-Pin SOIC

Pericom Semiconductor Corporation  1-800-435-2336 

Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.
12-07-0005

PT0199-8 07/05/12 7

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived PT8A2704AWEX Datasheet file may be downloaded here without warranties.

Datasheet ID: PT8A2704AWEX 510148