DEMO MANUAL DC086 BATTERY CHARGER LT1510 Constant-Voltage/ Constant-Current Lithium-Ion Battery Charger U DESCRIPTIO Demonstration board DC086 is a complete lithium-ion cells being charged (4.2V, 8.4V or 12.6V). Charging cur- battery charger designed for 1-, 2- or 3-cell applications rent is programmed for 1.3A by resistor R1. (other rechargeable battery types can also be charged, see The DC input voltage must be at least 3V greater than the page three). The LT 1510 is used in a high efficiency output voltage. When the input voltage is removed, an current mode step-down switching topology, capable of external low current MOSFET (Q1) provides a disconnect providing up to 1.5A of charging current. This demo board for the output voltage divider resistors and the chip goes uses all surface mount components, resulting in a circuit into a sleep mode, draining approximately 3A from the occupying approximately 1 square inch of board area with battery. less than 0.3 in. (7.6mm) height. Jumpers J1 and J2, located on the demo board, are used , LTC and LT are registered trademarks of Linear Technology Corporation. to select the correct charging voltage for the number of WWU W PERFOR A CE SU ARY PARAMETER CONDITIONS LIMITS V V + 3V V 28V* IN OUT IN Battery Voltage (V)V = 10V 4.2 0.7% BAT IN When Charging Terminates V = 15V 8.4V 0.7% IN = 20V 12.6V 0.7% V IN Maximum Battery Charging Current 1.3A 5% Note: Good thermal PC board layout techniques are required when operating near maximum power levels to prevent excessive junction temperatures. Note: For 0.5% battery-voltage accuracy, replace R3 to R8 with 0.1% resistors. *For V > 25V, C1 should be replaced with a higher voltage rating capacitor. IN W U U TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO Component Side Demo Board Charging Efficiency 96 V = 15V CC 94 V = 8.4V BAT 92 90 88 86 84 82 80 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 BATTERY CHARGING CURRENT (A) DM086 TPC01 1 EFFICIENCY (%)DEMO MANUAL DC086 BATTERY CHARGER U WW PACKAGE A D SCHE ATIC DIAGRA S J4 J3 V GND IN TOP VIEW D1 D2 MBRS140L 1 16 MBRS140L GND GND GND 1 16 GND 2 15 SW V SW 2 15 V CC 1, 4 CC2 C2 3 14 BOOST V C1 0.22F BOOST 3 14 V CC CC1 L1 10F 4 13 CTX33-2 GND PROG GND 4 13 PROG LT1510 33H 5 12 D3 R2 OVP V OVP 5 12 V C C MMBD914 300 R1 2, 3 R9 6 11 SENSE BAT SENSE 6 11 BAT 3.83k 1k C3 7 10 0.25% 1F C5 GND GND GND 7 10 GND 16V 0.1F 8 9 GND GND GND 8 9 GND I V BAT BAT S PACKAGE 16-LEAD PLASTIC SO J6 + + Q1 C4 Li-Ion V IN 2N7002 22F BATTERY LT1510CS J1 J2 J5 FOUR CORNER PINS ARE FUSED TO INTERNAL DIE ATTACH PADDLE FOR HEAT SINKING TO PC BOARD PROGRAM OUTPUT VOLTAGE BATTERY R3 R4 R5 R6 R7 R8 USE GENEROUS AMOUNTS OF PC BOARD J1 J2 VOLTAGE 4.99k 3.52k 4.99k 3.52k 4.99k 3.52k COPPER AROUND LEADS (SEE LT1510 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% CLOSED CLOSED 4.2V DATA SHEET AND DESIGN NOTE 124) CLOSED OPEN 8.4V OPEN OPEN 12.6V DM086 SCHEMATIC Figure 1. Demo Board Schematic PARTS LIST REFERENCE DESIGNATOR QUANTITY PART NUMBER DESCRIPTION VENDOR TELEPHONE 1E106ZY5U-C304F-T Tokin (408) 432-8020 C1 1 THCS50EIE106Z 10F 25V 20% Y5U Ceramic Capacitor United Chemicon/Marcon (708) 696-2000 C2 1 12063C224MAT2A 0.22F 25V 20% X7R Ceramic Capacitor AVX (207) 282-5111 C3 1 1206YG105ZAT2A 1F 16V Y5V Ceramic Capacitor AVX (207) 282-5111 C4 1 TPSD226M025R0200 22F 25V 20% Tantalum Capacitor AVX (207) 282-5111 C5 1 12065C104MAT2A 0.1F 50V 20% X7R Ceramic Capacitor AVX (207) 282-5111 D1, D2 2 MBRS140LT3 1A 40V Schottky Diode Motorola (602) 244-3550 D3 1 MMBD914LT1 100V Silicon Diode Motorola (602) 244-3550 J1, J2 2 TSW-102-07-G-S 0.1 cc, 0.025 sq. 2-Pin Jumper Samtech (800) 726-8329 J3 to J6 4 1502-2 0.090 Turret Terminal Keystone (718) 956-8900 L1 1 CTX33-2 33H 2A SMT Inductor Coiltronics (407) 241-7876 Q1 1 2N7002 N-Channel MOSFET Transistor Siliconix (800) 554-5565 R1 1 CR1206F3K83CT 3.83k 1/4W 0.25% Chip Resistor IRC (512) 992-7900 R2 1 CR32-301J-T 300 1/8W 5% Chip Resistor AVX (207) 282-5111 R3, R5, R7 3 CR1206F4K99CT 4.99k 1/4W 0.25% Chip Resistor IRC (512) 992-7900 R4, R6, R8 3 CR1206F3K52CT 3.52k 1/4W 0.25% Chip Resistor IRC (512) 992-7900 R9 1 CR32-102J-T 1k 1/8W 5% Chip Resistor AVX (207) 282-5111 U1 1 LT1510CS SO-16 Battery Charger IC LTC (408) 432-1900 2