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LT1510CGN Datasheet(PDF) 6 Page - Linear Technology |
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LT1510CGN Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LT1510/LT1510-5 TYPICAL PERFORMANCE CHARACTERISTICS SWITCH CURRENT (A) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.8 2.0 1.6 50 45 40 35 30 25 20 15 10 5 0 1510 G07 VCC = 16V VBOOST = 38V 28V 18V Switch Current vs Boost Current vs Boost Voltage TEMPERATURE ( °C) 0 2.470 2.468 2.466 2.464 2.462 2.460 2.458 25 50 75 100 1510 G14 125 150 Reference Voltage vs Temperature VBOOST (V) 4 26 8 16 18 20 96 95 94 93 92 91 90 89 88 87 86 LT1510 • TPC15 10 12 14 22 VBOOST vs Maximum Duty Cycle PIN FUNCTIONS GND: Ground Pin. SW: Switch Output. The Schottky catch diode must be placed with very short lead length in close proximity to SW pin and GND. VCC: Supply for the Chip. For good bypass, a low ESR capacitor of 10 µForhigherisrequired,withtheleadlength kept to a minimum. VCC should be between 8V and 28V and at least 2V higher than VBAT for VBAT less than 10V, and 2.5V higher than VBAT for VBAT greater than 10V. Under- voltage lockout starts and switching stops when VCC goes below 7V. Note that there is a parasitic diode inside from SW pin to VCC pin. Do not force VCC below SW by more than 0.7V with battery present. All VCC pins should be shorted together close to the pins. BOOST: This pin is used to bootstrap and drive the switch power NPN transistor to a low on-voltage for low power dissipation. In normal operation, VBOOST = VCC + VBAT when switch is on. Maximum allowable VBOOST is 55V. SENSE: Current Amplifier CA1 Input. Sensing can be at either terminal of the battery. Note that current sense resistor RS1 (0.08Ω) is between Sense and BAT pins. BAT: Current Amplifier CA1 Input. PROG: This pin is for programming the charging current and for system loop compensation. During normal opera- tion, VPROG stays close to 2.465V. If it is shorted to GND the switching will stop. When a microprocessor-controlled DAC is used to program charging current, it must be capable of sinking current at a compliance up to 2.465V. VC: This is the control signal of the inner loop of the current mode PWM. Switching starts at 0.7V and higher VC corresponds to higher charging current in normal opera- tion. A capacitor of at least 0.1 µF to GND filters out noise and controls the rate of soft start. To shut down switching, pull this pin low. Typical output current is 30 µA. OVP: This is the input to the amplifier VA with a threshold of 2.465V. Typical input current is about 50nA into pin. For charging lithium-ion batteries, VA monitors the battery voltage and reduces charging current when battery volt- age reaches the preset value. If it is not used, the OVP pin should be grounded. |
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Similar Description - LT1510CGN |
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