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LTC3527EUD-TRPBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC3527EUD-TRPBF Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  LTC3527/LTC3527-1 8 35271f ⎯S⎯H⎯D⎯N⎯1 (Pin 1): Boost Converter 1 Logic-Controlled Shutdown Input. There is an internal 4MΩ pull-down on this pin. • ⎯S⎯H⎯D⎯N⎯1 = High: Normal free running operation, 1.2MHz/2.2MHz typical operating frequency. • ⎯S⎯H⎯D⎯N⎯1 = Low: Shutdown, quiescent current < 2µA. Note: Both converters must be shut down together to achieve < 2µA quiescent current. FB1 (Pin 2): Boost Converter 1 Feedback Input to the gm Error Amplifier. Connect resistor divider tap to this pin. The output voltage can be adjusted from 1.6V to 5.25V by: VV R R See Block Diagram OUT1 120 1 1 2 =+ ⎡ ⎣⎢ ⎤ ⎦⎥ .• ( ) MODE (Pin 3): Logic-Controlled Mode Input for Both Boost Converters. • MODE = High: Fixed frequency operation • MODE = Low: Automatic Burst Mode operation MODE pin must be 1V or greater to ensure fixed frequency over all operating conditions. VOUT1 (Pin 5): Boost Converter 1 Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier MOSFET. Driver bias is derived from VOUT1. PCB trace length from VOUT1 to the output filter capacitor(s) should be as short and wide as possible. SW1 (Pin 6): Boost Converter 1 Switch Pin. Connect the inductor between SW1 and VIN1. Keep these PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. If the inductor current falls to zero or ⎯S⎯H⎯D⎯N⎯1 is low, an internal 100Ω anti-ringing switch is connected from SW1 to VIN1 to minimize EMI. SW2 (Pin 7): Boost Converter 2 Switch Pin. Connect the inductor between SW2 and VIN2. Keep these PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. If the inductor current falls to zero or ⎯S⎯H⎯D⎯N⎯2 is low, an internal 100Ω anti-ringing switch is connected from SW2 to VIN2 to minimize EMI. VOUT2 (Pin 8): Boost Converter 2 Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier MOSFET. Driver bias is derived from VOUT2. PCB trace length from VOUT2 to the output filter capacitor(s) should be as short and wide as possible. FSEL (Pin 10): Logic-Controlled Frequency Select Input. • FSEL = High: 2.2MHz Operation • FSEL = Low: 1.2MHz Operation FB2 (Pin 11): Boost Converter 2 Feedback Input to the gm Error Amplifier. Connect resistor divider tap to this pin. The output voltage can be adjusted from 1.6V to 5.25V by: VV R R See Block Diagram OUT2 120 1 3 4 =+ ⎡ ⎣⎢ ⎤ ⎦⎥ .• ( ) ⎯S⎯H⎯D⎯N⎯2 (Pin 12): Boost Converter 2 Logic-Controlled Shutdown Input. There is an internal 4MΩ pull-down on this pin. • ⎯S⎯H⎯D⎯N⎯2 = High: Normal free-running operation, 1.2MHz/2.2MHz typical operating frequency. • ⎯S⎯H⎯D⎯N⎯2 = Low: Shutdown, quiescent current < 2µA. Note: Both converters must be shut down together to achieve < 2µA quiescent current. PGOOD2 (PIN 13): Boost Converter 2 Power Good Com- parator Output. This open-drain output is low when VFB is 9% below its regulation voltage. GND (Pin 14): Signal Ground. This pin is used as a ground reference for the internal circuitry of the LTC3527/ LTC3527-1. VIN, VIN1, VIN2 (Pins 15, 4, 9): Battery Input Voltage. See Operation section for more information. PGOOD1 (PIN 16) Boost Converter 1 Power Good Com- parator Output. This open-drain output is low when VFB is 9% below its regulation voltage. Exposed Pad (Pin 17): Backplane. The Exposed Pad is PGND and must be soldered to the PCB ground plane. It serves as the power ground connection for VOUT1 and VOUT2, and as a means of conducting heat away from the package. PIN FUNCTIONS |
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