Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Features Description • Fast charging of nickel cadmium (NiCd) or nickel- The PT8A2704 fast charger IC is low-cost CMOS metal hydride (NiMH) batteries battery-charge controller providing reliable charge Fast charging termination by negative delta voltage, termination for both NiCd and NiMH battery applications, maximum voltage, maximum temperature, and 90 such as power tools and consumer electronics. A current- minutes charging time limited or constant-current supply allows the PT8A2704 • Support 1 to 8 cells fast charging to be a cost-effective charger with only a few external • 10% (with metal options) of constant charging cur- components. The PT8A2704 also has programmable rent for trickle charging charging time and programmable trickle charging rate • On-chip 2.0V regulator control by options in a single IC for charging NiCd or • On-chip precision ADC NiMH battery cells. • Internal RC oscillator with external R&C compo- • Charge controller for negative delta voltage fast charg- nents ing termination • • Low cost 8-Pin DIP/SOIC package For safety, fast or tickle charging is inhibited if the battery temperature is outside a safety threshold. Fast charging is normally terminated by any of the following: • negative delta voltage • maximum voltage • maximum temperature • maximum charging time Ordering Information Applications P a r t N o. Pa ck a ge PT8A2704PE Lead free DIP- 8 PT8A2704WE Lead free SOIC- 8 PT0199(04/07) 1 • Rechargeable shavers and hair cutters • Rechargeable RC cars • Rechargeable power tools Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Block Diagram Fig2 Function Block diagram CORD Input Control Charging/discharging Logic Control CHARGE POR MCLK VB VT 5-bit ADC OSC 2.0V Voltage Re gulator VEE VCC PT0199(04/07) Oscillator 2 GND Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Pin Information Pin Configuration 1 GN D VEE 8 2 VB CHARG E 7 3 VT VDD VCC 6 4 OSC CORD 5 Pin Description No. Pin Name I/O Description 1 GND - Power ground 2 3 4 5 6 7 8 VB VT OSC CORD VCC CHARGE VEE I I I I O O 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 PT0199(04/07) 3 Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Functional Description • Voltage Regulator (2.0V Regulator): Built-in voltage regulator to supply power RC oscillator and precision ADC • Precision ADC: VB measures the battery voltage. VB is a divided voltage from • Oscillator: Internal RC oscillator to generate a 64KHz clock 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 • POR (Power-on reset): Reset all internal logics on powerup. the ADC which is 0.8VEE to 0.9VEE. • Charging Control: Charging control enable output (CHARGE) which can be used to show charging status. It is VT measures the temperature of the battery with an external NTC (refer to How to determine RX1 on page 7). Maximun logic high during constant current charging and 12.5Hz with 10% duty cycle during trickle current charging temperature termination occurs when the VT exceeds a temperature cut-off threshold voltage (eg. 50 o C which equivalent to 0.887VEE). Both constant current or tickle • AC Cord Control: CORD input is external cord detection pin (digital level), active high. charging will stop completely when the temperature exceeds another threshold voltage (eg. 55 oC which equivalent to 0.897VEE). When the CORD is high, fast charging is started. Fast charging continues until one of the four possible termination conditions occurs: • negative delta voltage • maximum voltage • maximum temperature • maximum time After the fast charging is terminated, pulse (or tickle) charging will be started until the CORD is low (see below Figure). Charging Cycle Phases No charging Fast charging Pulse-trickle Stop charging CORD CHARGE PT0199(04/07) 4 Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Maximum Ratings Storage Temperature ...........................................................-25oC to +85oC Supply Voltage to Ground Potential (Inputs & VCC Only)..............-0.5V to VCC+0.5V 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 A DC Vin Fo s c TA PT0199(04/07) Des cription Op eratin g v o ltag e In p u t v o ltag e ran g e (VT, VB) Freq u en cy o f o s cillato r (R=47kΩ , C=390p F) Op eratio n temp eratu re 5 Min 2.2 0.8 54.4 0 Typ 2.4 64 25 Max 5.5 0.9 73.6 70 Unit V VEE KHz ℃ Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| DC Electrical Characteristics DC Electrical Characteristics (TA=0~70oC, VCC=2.4V unless otherwise claims) Sym Description Test Conditions Input low leakage current for IIl, IIH CORD pin Output high current for Ioh Voh =2.2V CHARGE pin Output low current for CHARGE Vol =0.2V Iol pin VEE Regulator output voltage No load Line regulation of regulator No load, 2.2≤VCC≤3.0V ∆VO Min Typ Max Unit -1 - 1 µA -3 - mA 3 - - 1.9 2 2.1 V - - 50 mV ∆VLDR Load regulation of regulator 0mA ≤ IL ≤3mA - - 50 mV VBMAX Maximum battery voltage for terminating fast-charge - - 0.9 - VEE VTMAX Maximum VT voltage for stopping charge - - 0.897 - VEE Rslt Average A/D resolution of ADC No load 6 6.25 6.5 mV DNL Differential nonlinearity of ADC No load - 1 - LSB INL Integral nonlinearity of ADC No load - 1 - LSB ICC Supply current R=47kΩ,C=390pF, No load - - 380 µA AC Electrical Characteristics AC Electrical Characteristics (TA=0~70oC, VCC=2.4V unless otherwise claims) S ym FO SC T FC PT0199(04/07) Des cription Os cillator Frequency M aximum fas t-charge time Tes t Conditions R=47kΩ , C=390pF OSC=64kHz 6 Min 54.4 - Typ 64 90 Max 73.6 - Unit kHz min Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Application Circuit 1. Application circuit for larger discharging current. KSB772 D1 Q1 VCC Constant Current Power Supply R4 1k * J1 R10 240 R1 270K 2 1 R11 10K C2 CORD C1 104 1uF R3 Q2 9014 10K 104 C4 A CHARGE 104 D2 1N4001 - VEE C5 104 VCC IC1 * + 100UF/10V Note: * means the related value varies from different application condition. VEE M1 B1 C10 PLUG_USE CORD R2 680k PLUG_USE S1 SW SPDT 1N5817 NTC1 VT R8 47K VB R5 100K C6 103 1 VEE R7 75K R6 100K C7 103 C8 10UF C11 390 VB 2 VT 3 OSC 4 C9 GND VEE VB CHARGE VT VDD OSC CORD 8 7 10UF/10V 240 6 5 LED1 CHARGE R9 VCC CORD C3 104 PT8A2704 2704 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 IC is always powered by battery, the static consumption must be considered in application design PT0199(04/07) 7 Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2. Application circuit for smaller discharging current. If discharging current is smaller, suggest to use the following schematic: VCC KSB772 VBAT D1 Q1 SLIDE ON S1 1N5819 Constant Current Power Supply R4 C4 1k * J1 R10 240 R1 270K C2 D2 1N4001 104 + C10 CORD 2 1 M1 B1 R2 680k 104 C1 1uF R3 10K Q2 9014 100UF/10V CHARGE A - CORD VEE VEE C5 VBAT * NTC1 VT 1 VEE R7 75K R8 47K VB R5 100K C6 R6 100K C7 103 103 VB 2 VT OSC C8 10UF C11 390 3 4 IC1 GND VEE VB CHARGE VT VDD OSC CORD 8 7 6 5 104 C9 10UF/10V LED1 CHARGE R9 240 CORD R12 VCC 560 C3 104 PT8A2704 Q3 SLIDE ON R13 10K 4.7k Z1 2.4V C12 10uF VEE How to determine RX1 NTC Assuming resistance of NTC at 55oCis RT. VT See the figure, VT=RX1*VEE/(RX1+RT)=1.8V RX1 VEE=2.0V, finally RX1=9*RT PT0199(04/07) 8 Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Mechanical Information PE (8-Pin DIP) 8 .240 .280 1 6.09 7.11 .355 .400 7.62 8.25 9.01 10.16 .300 .325 .210 Max 5.33 SEATING PLANE .008 .014 0.20 0.35 .015 Min .115 .150 2.921 3.81 X.XX X.XX .100 typical 2.54 .014 .022 0.381 0O 15o .430 Max 10.92 .356 .558 DENOTES DIMENSIONS IN MILLIMETERS Note: 1) Controlling dimensions in inches. JEDECMS-001 MS-001BA BA 2) Ref: JDDEC PT0199(04/07) 9 Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| WE (8-Pin SOIC) X.XX X.XX DENOTES DIMENSIONS IN MILLIMETERS Note: 1) Controlling dimensions in millimeters. JEDEC MS-001 2) Ref: JDDEC MS-012BA AA PT0199(04/07) 10 Ver:6 Data Sheet PT8A2704 Simple Fast Charger Controller |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Notes Pericom Technology Inc. Email: [email protected] Web-Site: www.pti.com.cn, www.pti-ic.com China: No. 20 Building, 3/F, 481 Guiping Road, Shanghai, 200233, China Tel: (86)-21-6485 0576 Fax: (86)-21-6485 2181 Asia Pacific: Unit 1517, 15/F, Chevalier Commercial Centre, 8 Wang Hoi Rd, Kowloon Bay, Hongkong Tel: (852)-2243 3660 Fax: (852)- 2243 3667 U.S.A.: 2380 Bering Drive, San Jose, California 95131, USA Tel: (1)-408-435 0800 Fax: (1)-408-435 1100 Pericom Technology Incorporation 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 Technology does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom Technology product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom Technology Incorporation. PT0199(04/07) 11 Ver:6