LP3927ILQX-AH National Semiconductor, LP3927ILQX-AH Datasheet - Page 14

• Manufacturer Part Number: LP3927ILQX-AH
• Manufacturer: National Semiconductor
• Type: Power Management Sysr

Specifications of LP3927ILQX-AH

• Output Current: 200mA
• Output Voltage: 2.6/2.85/2.9/3V
• Operating Supply Voltage (min): 3.3V
• Operating Supply Voltage (typ): 3.7V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 85C
• Package Type: LLP EP
• Mounting: Surface Mount
• Pin Count: 28
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Not Compliant

Timing Diagrams
(Continued)
VEXT Detect W/Keyboard Interrupts
20037928
Note: Diagram indicates Open Drain IRQ tied to V
.
DD
*** = Internal signal
1. VEXT goes active low.
2. VEXT 32 msec de-bounce period.
3. Delay between LDO1 and LDO2 enable.
4. Both LDO1 and LDO2 outputs reach 95% of respective output voltage, start Reset timer.
5. Reset delay.
6. Keyboard de-bounce delay.
7. Keyboard pulse must be a minimum of 32 msec.
8. PS_HOLD may go low after Key press, but LDOs stay on since VEXT is low.
9. VEXT goes high, begin shutdown since PS_HOLD is low.
10. Delay between RST going low and LDO2 disabled.
11. Delay between LDO2 disable and LDO1 disabled.
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