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LTC3537 Datasheet(PDF) 9 Page - Linear Technology |
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LTC3537 Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page LTC3537 9 3537fa PIN FUNCTIONS MODE (Pin 1): Logic Controlled Input for the Auto-Burst Mode Feature. MODE = High: PWM operation with Burst Mode Operation MODE = Low: PWM operation only LBI (Pin 2): Low-Battery Comparator Non-Inverting Input. (Comparator enabled with ENBST or ENLDO) SGND (Pin 3): Signal Ground. Provide a short direct PCB path between GND and the (–) side of the input and output capacitors. VINB (Pin 4): Input Supply for the Step-Up Converter. Connect a minimum of 1μF ceramic decoupling capacitor from this pin to ground. PGDB (Pin 5): Power Good Indicator for the Boost Con- verter. This is an open-drain output that sinks current when VOUTB is greater than 94% of the programmed voltage. ENBST (Pin 6): Logic controlled shutdown input for the boost converter. ENBST = High: Normal operation ENBST = Low: Shutdown PGDL (Pin 7): Power Good Indicator for the LDO Regulator. This is an open-drain output that sinks current when VOLDO is greater than 96% of the programmed voltage. ENLDO (Pin 8): Logic Controlled Shutdown Input for the LDO Regulator. ENLDO = High: Normal operation ENLDO = Low: Shutdown FBB (Pin 9): Feedback Input to the gm Error Amplifier of the Boost Converter. Connect resistor divider tap to this pin. The output voltage can be adjusted from 1.5V to 5.25V by: VOUTB = 1.2V • [1 + (R2/R1)] FBL (Pin 10): Feedback Input to the gm Error Amplifier of the LDO. Connect resistor divider tap to this pin. The output voltage can be adjusted from 0.6V (typical) to 5V by: VOLDO = 0.6V • [1 + (R4/R3)] VOLDO (Pin 11): LDO Regulator Output. PCB trace from VOLDO to the output filter capacitor (1μF minimum) should be as short and as wide as possible. VINL (Pin 12): Input Supply for the LDO Regulator. VOUTB (Pin 13): Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier. PCB trace length from VOUTB to the output filter capacitor (4.7μF minimum) should be as short and wide as possible. SW (Pin 14): Switch Pin. Connect the inductor between SW and VINB. Keep these PCB trace lengths as short and wide as possible to reduce EMI. If the inductor current falls to zero or ENBST is low, an internal anti-ringing switch is connected from SW to VINB to minimize EMI. PGND (Pin 15): Power Ground. Provide a short direct PCB path between GND and the (–) side of the input and output capacitors. LBO (Pin 16): Low-Battery Comparator Output. (Open- Drain) Exposed Pad (Pin 17): Power Ground. The Exposed Pad must be soldered to the PCB. |
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