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LP3927ILQ-AH Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LP3927ILQ-AH Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 16 page Pin Description Pin Name Functional Description 1 VO1 150 mA, LDO1 output pin. 2 EN5 LDO5 enable input. 3 EN4 LDO4 enable input. 4 EN3 LDO3 enable input. 5 RST Externally pulled high, open drain output to processor/memory reset. 6 IRQ Externally pulled high, open drain output to processor interrupt indicating KYBD has gone high. 7 PS_HOLD Input from the processor to the LP3927. A HIGH indicates a steady supply of power is granted. Refer to ’Application Hints’ section for more detail. 8 KYBD An active high input signal indicating the keyboard “On/Off” button has been asserted. Refer to ’Application Hints’ section for more detail. 9 D_GND Digital ground, used primarily for the digital and DAC circuits. 10 VEXT Active low input indicating a battery charger insertion Refer to ’Application Hints’ section for more detail. 11 BYP Reference bypass pin. 12 TEST_MODE Pin used for production testing, factory use only. This pin should be grounded in applications. 13 LED_EN LED driver enable input. 14 LED LED driver, drain connection of the LED drive MOSFET. 15 LED_PGM LED drive current programming pin. 16 OP_AMP_OUT Operational amplifier output pin. 17 IN− − input of the Op-Amp. 18 IN+ + input of the Op-Amp. 19 OP_AMP_V DD Power supply pin for Op-Amp. 20 A_GND2 Ground for analog. 21 VO5 200 mA, LDO5 output pin. 22 V DD3 Input power pin for LDO5. V DD1,VDD2 and VDD3 must be tied together externally. 23 VO4 150 mA, LDO4 output pin. 24 V DD2 Input power pin for LDO3 and LDO4. V DD1,VDD2 and VDD3 must be tied together externally. 25 VO3 100 mA, LDO3 output pin. 26 A_GND1 Ground for analog. 27 VO2 200 mA, LDO2 output pin. 28 V DD1 Input power pin for LDO1 and LDO2. V DD1,VDD2 and VDD3 must be tied together externally. www.national.com 3 |
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