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LM25575-Q1 Datasheet(PDF) 2 Page - Texas Instruments |
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LM25575-Q1 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 32 page  1 2 3 4 5 6 7 8 VIN PRE FB VCC IS AGND OUT RAMP 9 10 11 12 COMP SD BST RT 13 14 15 16 SS PGND SYNC SW BST SW COMP FB SS RAMP RT VCC VIN OUT IS GND LM25575 VIN VOUT SYNC SD LM25575, LM25575-Q1 SNVS479G – JANUARY 2007 – REVISED APRIL 2013 www.ti.com Simplified Application Schematic Connection Diagram Figure 1. Top View 16-Lead HTSSOP PIN DESCRIPTIONS Pin(s) Name Description Application Information 1 VCC Output of the bias regulator Vcc tracks Vin up to 9V. Beyond 9V, Vcc is regulated to 7 Volts. A 0.1uF to 1uF ceramic decoupling capacitor is required. An external voltage (7.5V – 14V) can be applied to this pin to reduce internal power dissipation. 2 SD Shutdown or UVLO input If the SD pin voltage is below 0.7V the regulator will be in a low power state. If the SD pin voltage is between 0.7V and 1.225V the regulator will be in standby mode. If the SD pin voltage is above 1.225V the regulator will be operational. An external voltage divider can be used to set a line undervoltage shutdown threshold. If the SD pin is left open circuit, a 5µA pull-up current source configures the regulator fully operational. 3 Vin Input supply voltage Nominal operating range: 6V to 42V 4 SYNC Oscillator synchronization input or output The internal oscillator can be synchronized to an external clock with an external pull-down device. Multiple LM25575 devices can be synchronized together by connection of their SYNC pins. 5 COMP Output of the internal error amplifier The loop compensation network should be connected between this pin and the FB pin. 6 FB Feedback signal from the regulated output This pin is connected to the inverting input of the internal error amplifier. The regulation threshold is 1.225V. 7 RT Internal oscillator frequency set input The internal oscillator is set with a single resistor, connected between this pin and the AGND pin. 2 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM25575 LM25575-Q1 |
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