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LTC3114-1 Folha de dados(PDF) 10 Page - Analog Devices |
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LTC3114-1 Folha de dados(HTML) 10 Page - Analog Devices |
10 / 34 page LTC3114-1 10 Rev. D For more information www.analog.com PIN FUNCTIONS PGND (Pin 1, Exposed Pad Pin 17): Power Ground Connections. The PGND pin must be electrically con- nected to a power ground plane in the application. The exposed pad is an additional power ground connection in parallel with Pin 1. Optimal thermal performance requires that the exposed pad be soldered to the PC board and preferably to a ground plane. SW2 (Pin 2): Buck-Boost Converter Power Switch Pin. This pin is connected to one side of the buck-boost inductor. PVOUT (Pin 3): Buck-Boost Converter Power Output. This pin should be connected to a low ESR capacitor of at least 10µF. The capacitor should be placed as close to the IC as possible and should have a short return path to PGND. In applications subject to output short circuits through an inductive load, it is recommended that a Schottky diode be installed from ground (anode) to PVOUT (cathode) to limit the extent that PVOUT is driven below ground during the short-circuit transient. RUN (Pin 4): Input to Enable and Disable the IC and Set Custom Input Undervoltage Lockout (UVLO) Thresholds. The RUN pin can be driven by an external logic signal to enable and disable the IC. In addition, the voltage on this pin can be set by a resistive voltage divider connected to the input voltage in order to provide accurate turn-on and turn-off (UVLO) thresholds. The IC is enabled if RUN exceeds 1.2V nominally. Once enabled, the UVLO thresh- old has built-in hysteresis of approximately 100mV, so turn-off will occur when the voltage on RUN drops to below 1.1V nominally. To continuously enable the IC, RUN can be tied directly to the input voltage up to the absolute maximum rating. PROG (Pin 5): Output Current Programming Pin and Output of the Switch D Current Sense Amplifier. A current proportional to the current in switch D, the buck-boost converter output current, is delivered from PROG. The PROG current magnitude is approximately ISWD/25000. Connect a parallel resistor and capacitor from PROG to GND to generate a voltage proportional to output current. In applications where this voltage is used to control aver- age output current, the resistor value should be set such that the desired average output current produces 1V on PROG and is given by: RPROG(Ω) = 1V • 25000 IOUT A ( ) Alternatively, the voltage on PROG can be connected to an A/D converter and used for system diagnostic functions. Refer to the Applications Information section for complete details on how to select the proper values for RPROG and CPROG. VC (Pin 6): Error Amplifier Output. A frequency com- pensation network must be connected between VC and GND to stabilize the buck-boost converter. Refer to the Applications Information section for details. FB (Pin 7): Feedback Voltage Input. A resistor divider connected to this pin sets the output voltage for the buck- boost converter. The nominal FB voltage is 1V. Care should be taken in the routing of the connection to this pin to minimize the possibility of stray coupling from the SW pins. VOUT is determined by the following relationship: VOUT (V) = 1 + RTOP/RBOT where RTOP is connected from PVOUT to FB and RBOT is connected from FB to GND GND (Pin 8): Signal Ground. This pin is the ground con- nection for the control circuitry of the IC and must be tied to ground in the application. LDO (Pin 9): Low Voltage Supply Input for the IC Control Circuitry. This pin powers internal IC control circuitry and must be connected to the LDO pin in the application. A 4.7µF or larger bypass capacitor must be connected between this pin and ground. Pins LDO and PLDO must be connected together in the application. VIN (Pin 10): LDO Supply Connection. This pin provides power to the internal VCC regulator. Pins VIN and PVIN must be connected together in the application. If the trace connecting VIN and PVIN is of substantial length, a 1µF capacitor should be connected from VIN to GND as close to the IC pins as possible. |
Nº de peça semelhante - LTC3114-1 |
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Descrição semelhante - LTC3114-1 |
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