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LM25005MH/NOPB データシート(PDF) 2 Page - Texas Instruments |
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LM25005MH/NOPB データシート(HTML) 2 Page - Texas Instruments |
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2 / 28 page  1 2 3 4 5 6 7 8 9 10 VIN PRE COMP VCC SW PGND IS RT SS 11 12 13 14 15 16 RAMP SYNC OUT SD BST AGND FB 17 18 19 20 PGND IS VIN SW LM25005 SNVS411C – JANUARY 2006 – REVISED MARCH 2013 www.ti.com Connection Diagram Figure 1. Top View 20-Lead HTSSOP PIN DESCRIPTIONS Pin(S) Name Description Application Information 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 1 VCC Output of the bias regulator external voltage (7.5V – 14V) can be applied to this pin to reduce internal power dissipation. 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 2 SD Shutdown or UVLO input 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, 4 Vin Input supply voltage Nominal operating range: 7V to 42V The internal oscillator can be synchronized to an external clock 5 SYNC Oscillator synchronization input or output with an external pull-down device. Multiple LM25005 devices can be synchronized together by connection of their SYNC pins. The loop compensation network should be connected between 6 COMP Output of the internal error amplifier this pin and the FB pin. This pin is connected to the inverting input of the internal error 7 FB Feedback signal from the regulated output amplifier. The regulation threshold is 1.225V. The internal oscillator is set with a single resistor, connected 8 RT Internal oscillator frequency set input between this pin and the AGND pin. The recommended frequency range is 50KHz to 500KHz. An external capacitor connected between this pin and the AGND 9 RAMP Ramp control signal pin sets the ramp slope used for current mode control. Recommended capacitor range 50pF to 2000pF. 10 AGND Analog ground Internal reference for the regulator control functions An external capacitor and an internal 10µA current source set the time constant for the rise of the error amp reference. The SS 11 SS Soft-start pin is held low during standby, Vcc UVLO and thermal shutdown. 12 OUT Output voltage connection Connect directly to the regulated output voltage. 13, 14 PGND Power ground Low side reference for the PRE switch and the IS sense resistor. 2 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LM25005 |
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