PT8A2704WE

PT8A2704/04A ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Simple Fast Charger Controller Product Features Product Description  Fast charge of nickel cadmium (NiCd) or nickel- The PT8A2704/04A Fast-Charger IC is low-cost CMOS metal hydride (NiMH) batteries battery-charge controller providing reliable charge Fast-charge termination by negative delta voltage, termination maximum voltage, maximum temperature, and 90 applications, such as Power tool and Consumer minutes charging time electronics. A current-limited or constant–current supply  Support 1 to 8 cells fast charging allows the PT8A2704/04A to be a cost-effective charger  10% (PT8A2704) or 4% (PT8A2704A) of constant with charging current for trickle charging PT8A2704/04A has programmable charging time and  On-chip 2.0V regulator programmable trickle charging rate control by options in  On chip precise ADC a single IC for charging NiCd or NiMH battery cells.  Internal RC oscillator with external R&C For safety, fast or trickle charging is inhibited if the components battery temperature is over a safety threshold. Fast Low cost 8-pin DIP/SOIC package charge is terminated by any of the following:   only for a both few NiCd and external NiMH battery components. The - Negative delta voltage/zero delta voltage Applications - Maximum voltage  Rechargeable shavers and hair cutters  Rechargeable RC cars  Rechargeable power tools - Maximum temperature - Maximum time Pin Assignment and Pin Description Pin Description PT8A2704/04A DIP-8 or SOIC-8 Package (Top View) Pin No. 1 2 3 Pin Name GND VB VT I/O Description I I Power ground Battery voltage input (1.6V – 1.8V) NTC voltage input(1.6V – 1.8V) RC oscillator input, external resistor pull-up and capacitor pull-down Cord detection input Positive power supply voltage Charging control enable 2.0v regulated voltage 4 OSC I 5 6 7 8 CORD VCC CHARGE VEE I O O 12-07-0005 PT0199-8 1 07/05/12 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. 50˚C which equivalent to 0.887VEE). Constant current or trickle charging will stop completely when the temperature exceeds another threshold voltage (eg. 55˚C which equivalent to 0.897VEE). Charging Cycle Phases No charging Fast charging Pulse-trickle Stop charging CORD CHARGE Fast charge is started when the CORD is high. If the battery voltage is over the limit or temperature exceeds 50˚C, pulse-trickle charge begins and the device charges the battery with trickle charge till the CORD is low (see above Figure). Fast charge will be termination by one or more of the four possible termination conditions:  negative delta voltage/delta voltage  maximum voltage  maximum temperature  maximum time 12-07-0005 PT0199-8 2 07/05/12 PT8A2704/04A Simple Fast Charger Controller ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Maximum Ratings Storage Temperature…………………………………………... -25oC to +85oC Supply Voltage to Ground Potential (VCC)…………. ……………...…-0.5V to 6V DC Input Voltage…………………… ……………..……… -0.5V to VCC+0.5V DC Output Current……………………………………………....20mA Power Dissipation…………………………………………...…500mW Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Recommended Operation Condition Parameters VCC ADC VIN Fosc TA Description Operating Voltage Input voltage range (VT, VB) Frequency of oscillator (C=390pF, R=47kΩohm) Operation Temperature Min. 2.2 0.8 54.4 0 Type. 2.4 64 25 Max. 5.5 0.9 73.6 70 Unit V VEE kHz ˚C DC Electrical Characteristics (TA= 0~70°C, VCC= 2.4V unless otherwise claims) Symbol Description Input Low/HIGH leakage current for IIL, IIH CORD pin IOH Output HIGH current IOL Output LOW current VEE Regulator output voltage Line Regulation of regulator VO VLDR Load regulation Maximum battery voltage to stop fastVBmax charge Maximum VT voltage for battery VTmax temperature detection to stop fastcharge Rslt Average A/D resolution of ADC DNL ADC Differential nonlinearity INL ADC Integral nonlinearity ICC Supply Current Test Conditions Min. Typ. Max. Unit VCC=2.4V,VIL=0.2V, VIH=2.2V -1 - 1 μA CHARGE pin, VOH=2.2V CHARGE pin, VOL=0.2V No load 2.2VVCC3.0V, No load -3 3 1.9 - 2.0 - 1 2.1 50 0mA  IL3mA - - 50 mV - - 0.9 - VEE - - 0.897 - VEE 6.00 - 6.25 1 1 - 6.50 380 mV LSB LSB μA Min. 54.4 7 3 Typ. 64 90 10 4 Max. 73.6 13 5 Unit kHz Minutes % % No load No load No load R=47kΩ, C=390pF, no load mA V mV AC Electrical Characteristics (TA= 0~70°C, VCC= 2.2V~3.0V) Symbol Description FOSC Oscillator Frequency TFC Maximum fast-charge time DC Test Conditions C=390pF, R=47kΩ OSC=64kHz Duty-cycle of charge pin output in PT8A2704 trickle charge mode PT8A2704A 12-07-0005 PT0199-8 3 07/05/12 PT8A2704/04A Simple Fast Charger Controller ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Typical Application Circuit 1. Application circuit for larger discharging current. PT8A2704/04A Application Circuit for Shaver with Two Batteries Note: a. R1 value can be adjusted to make sure the CORD voltage is around 2.0V. b. As the device is always powered by battery, the static consumption must be considered in application design. 12-07-0005 PT0199-8 4 07/05/12 PT8A2704/04A Simple Fast Charger Controller ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2. Application circuit for smaller discharging current. If discharging current is smaller, suggest using the following schematic: PT8A2704/04A Application Circuit for Shaver with Two Batteries PCB Layout Constraint 1. Cross angle between two Tracks should be larger than 90 degree. 2. Track should be short and wide enough to reduce voltage drop, especially Power supply and Ground as well as some tracks flowing with large current, such as switch Q1. 3. A ceramic cap C6 about 103 need to add between VT and Ground of PT8A2704 in order to prevent detection circuit from noise. 4. A ceramic cap C7 about 103 and C8 10μF Tan cap need to add between VB to Ground. VEE How to determine RX1 Assuming Resistance of NTC at 55˚C is RT. See right figure, below formula can be attained. VT=RX1*VEE/ (RX1+RT) =1.8V VEE=2.0V, finally RX1=9*RT NTC VT RX1 12-07-0005 PT0199-8 5 07/05/12 PT8A2704/04A Simple Fast Charger Controller ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Mechanical Information 8-Pin DIP Symbol A A1 A2 B B1 c D E E1 e L E2 Note: 1) Controlling dimensions in millimeters. 2) Ref : JEDEC MS-001D/BA 12-07-0005 Dimensions In Millimeters Min Max 3.710 4.310 0.510 3.200 3.600 0.380 0.570 1.524 BSC 0.204 0.360 9.000 9.400 6.200 6.600 7.320 7.920 2.540 BSC 3.000 3.600 8.400 9.000 PT0199-8 6 07/05/12 PT8A2704/04A Simple Fast Charger Controller ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| WE (8-Pin SOIC) Symbol A A1 A2 b c D E E1 e L θ Note: 1) Controlling dimensions in millimeters. 2) Ref : JEDEC MS-012E/AA Dimensions In Millimeters Min Max 1.350 1.750 0.100 0.250 1.350 1.550 0.330 0.510 0.170 0.250 4.700 5.100 3.800 4.000 5.800 6.200 1.27 BSC 0.400 1.270 0° 8° Ordering Information Part Number PT8A2704PE PT8A2704WE PT8A2704APE* PT8A2704AWE* Package Code P W P W 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 Notes:  E = Pb-free or Pb-free and Green  Adding X Suffix= Tape/Reel  *Contact Pericom for availability. Pericom Semiconductor Corporation  1-800-435-2336  www.pericom.com 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 7 07/05/12