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LM5088MHX-2 Datasheet(PDF) 2 Page - Texas Instruments |
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LM5088MHX-2 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 36 page  VIN EN SS RAMP RT GND COMP VCC BOOT HG SW CS CSG FB OUT DITH EP HTSSOP-16 VIN EN SS RAMP RT GND COMP VCC BOOT HG SW CS CSG FB OUT RES EP HTSSOP-16 LM5088, LM5088-Q1 SNVS600H – DECEMBER 2008 – REVISED MARCH 2013 www.ti.com Connection Diagram Figure 1. 16-Lead HTSSOP Package Figure 2. 6-Lead HTSSOP Package Top View (Dither version) Top View (Restart version) See Package Number PWP0016A See Package Number PWP0016A LM5088-1 LM5088-2 PIN DESCRIPTIONS Pin(s) Name Description Application Information 1 VIN Input supply voltage IC supply voltage. The operating range is 4.5V to 75V 2 EN Enable input If the EN pin voltage is below 0.4V the regulator will be in a low power state. If the EN pin voltage is between 0.4V and 1.2V the controller will be in standby mode. If the EN pin voltage is above 1.2V the controller will be operational. An external voltage divider can be used to set a line under voltage shutdown threshold. If the EN pin is left open, a 5µA pull-up current forces the pin to the high state and enables the controller. 3 SS Soft-start When SS is below the internal 1.2V reference, the SS voltage will control the error amplifier. An internal 11 µA current source charges an external capacitor to set the start-up rate of the controller. The SS pin is held low in the standby, VCC UV and thermal shutdown states. The SS pin can be used for voltage tracking by connecting this pin to a master voltage supply less than 1.2V. The applied voltage will act as the reference for the error amplifier. 4 RAMP Ramp control signal An external capacitor connected between this pin and the GND pin sets the ramp slope used for emulated current mode control. Recommended capacitor range 100 pF to 2000 pF. See the Applications section for selection of capacitor value. 5 RT/SYNC Internal oscillator frequency The internal oscillator is programmed with a single resistor between this pin and set input and synchronization the GND pin. The recommended frequency range is 50 kHz to 1 MHz. An input external synchronization signal, which is higher in frequency than the programmed frequency, can be applied to this pin through a small coupling capacitor. The RT resistor to ground is required even when using external synchronization. 6 GND Ground Ground return. 7 COMP Output of the internal error The loop compensation network should be connected between this pin and the amplifier FB pin. 8 FB Feedback signal from the This pin is connected to the inverting input of the internal error amplifier. The regulated output regulation threshold is 1.205V. 9 OUT Output voltage connection Connect directly to the regulated output voltage. 10 DITH Frequency Dithering ( A capacitor connected between DITH pin and GND is charged and discharged by LM5088-1 Only) 27 µA current sources. As the voltage on the DITH pin ramps up and down, the oscillator frequency is modulated between -5% to +5% of the nominal frequency set by the RT resistor. Grounding the DITH pin will disable the frequency dithering mode. 2 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Product Folder Links: LM5088 LM5088-Q1 |
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