SC803 SEMTECH [Semtech Corporation], SC803 Datasheet
SC803
Available stocks
Related parts for SC803
SC803 Summary of contents
Page 1
... The output voltage to the battery is controlled to within 1% of the programmed voltage for either 4.1V or 4.2V. The SC803 can also function as a general purpose cur- rent source current source for charging nickel- cadmium (NiCd) and nickel-metal-hydride (NiMH) batter- ies using external termination. ...
Page 2
... SC803 ° ° C ° C ° C ° ° ...
Page 3
... www.semtech.com SC803 ° ...
Page 4
... www.semtech.com SC803 ...
Page 5
... POWER MANAGEMENT Block Diagram Control OVP 9 1. Reference and OT SD GND 6 EN STAT 10 Status BIP BSEN 1 Vprog Detect VPRGM 2 2004 Semtech Corp. Fast Charge Enable UV Charge Pump OV 1.2V 4.2V 4.1V 3. Vout 1.2V V_FB - + + - Termination - + 1.2V 4.2V 4.1V 3.0V 5 SC803 VCC 13,14 100 100 1 0.1 15, ITERM IPRGM www.semtech.com VOUT ...
Page 6
... ITERM pin, the SC803 will turn off and the end of charge will be indicated by the status LED turning off. The equa- tion to set the termination current is given by: ...
Page 7
... The OVP LED will light whenever the SC803 is enabled and there is an overvoltage on the VCC pins. When this occurs the SC803 will turn off and stay off as long as the overvoltage condition remains. As soon as the overvolt- age is removed the SC803 will resume operation. The OVP LED will not light if the part is disabled, even though an overvoltage is present on the VCC pins ...
Page 8
... SC803. The best method of interfacing the SC803 with such a device is to place the SC803 in LDO mode, and monitor the current to the battery by an ADC that samples the voltage on the IPRGM pin. Slow and fast ...
Page 9
... BSEN trace follow in parallel the VOUT trace and tie them together at the contact point of the battery termi- nal for the best result. The bottom of the SC803 package has a heat slug and this slug should be tied to a ground plane of the PCB through one large via or a series of smaller vias. If there is no ground plane, an area should be dedicated on the bottom of the PCB to act as a heat sink ...
Page 10
... BSEN 8 16 BIP VOUT 6 15 GND VOUT 1.24K 3.01K SC803 JP8 619 SC801/SC801M 10 SC803 JP2 1 2 Adjustable Vout R1 OPEN VOUT / VCHG C2 R2 JP7 OPEN OPEN Li-Ion FAULT STATUS 2.2uF Bottom Gerber Silk Screen Gerber www.semtech.com ...
Page 11
... POWER MANAGEMENT LDO Mode Timing Diagram Vcc BIP Vout 1ms 1ms Iout Precharge Limit CP OVP Stat EN 2004 Semtech Corp. LDO Mode LDO Mode 6.5V 6.3V 5V 4.2V Low 4.2V 4ms 1ms 1ms I LIMIT Soft Start 1ms High Z 11 SC803 4ms I LIMIT www.semtech.com ...
Page 12
... Charge Mode Timing Diagram 4.2V Vcc BIP Vout 1ms 1ms Iout Precharge Limit CP OVP Stat EN 2004 Semtech Corp. Charge Mode Charge Mode Charge Mode Charge Mode 4.2V 1ms 2.8V precharge Icharge 4ms Termination Soft Start Current End of Charge 12 SC803 4.0V 4ms 1ms Monitor Mode www.semtech.com ...
Page 13
... Fast Charge Mode VOUT > 2.8V Iout = 1500/Rprog Yes IOUT < ITERM BSEN < CV-200mV 13 SC803 Over Voltage, Under Voltage, or Over Temperature will force the SC803 into Shutdown Mode from any state. STAT=High, Yes Soft Start BSEN = CV Yes Start CV Mode Yes Monitor Mode STAT = Low ...
Page 14
... Charge Mode Bias Current vs Input Voltage 2 1.75 1.5 1.25 1 4.3 4.7 Vout Leakage Current vs Temperature 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -40 -20 Output Voltage vs Temperature 4.11 4.1 ILOAD = 250mA 4.09 ILOAD = 500mA 4.08 -40 - Temperature (Degrees C) 14 SC803 5.1 5.5 5.9 6.3 6.7 Input Voltage (Volts 100 120 Temperature (Degrees C) ILOAD = 250mA ILOAD = 500mA 100 120 www.semtech.com ...
Page 15
... Output Current (mA) 4.5 4 3.5 3 2.5 2 1.5 2004 Semtech Corp. 1600 1400 1200 1000 800 600 400 200 0 1010 Battery Charge Profile Charge Time 15 IPRGM Voltage vs Output Current RPRGM = 1.87K 0 200 400 600 800 1000 Output Current (mA) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 www.semtech.com SC803 Vout Iout ...
Page 16
... B A1 .000 A2 b .010 D .153 D1 .074 E E .153 E1 .074 e L .018 N aaa bbb A2 SEATING PLANE e/2 LxN E bxN bbb D/2 16 SC803 DIMENSIONS INCHES MILLIMETERS NOM MAX MIN NOM MAX - - .040 0.80 1. .002 0.00 0.05 - (.008 (0.20) - .012 .014 0.25 0.30 0.35 .157 .161 3.90 4.00 4.10 .085 .089 1.90 2.15 2 ...
Page 17
... Contact Information Portable Power Management Products Division 2004 Semtech Corp. DIM Semtech Corporation 200 Flynn Rd., Camarillo, CA 93012-8790 Phone: (805)498-2111 FAX (805)498-3804 17 SC803 DIMENSIONS INCHES MILLIMETERS (.148) (3.75) .106 2.70 .091 2.30 .091 2.30 .026 0.65 .016 0.40 .041 1.05 .189 4.80 ...