LP3927ILQ-AZ/NOPB National Semiconductor, LP3927ILQ-AZ/NOPB Datasheet - Page 11

• Manufacturer Part Number: LP3927ILQ-AZ/NOPB
• Description: IC PWR MNGMNT CELL/PCS 28-LLP
• Manufacturer: National Semiconductor

Specifications of LP3927ILQ-AZ/NOPB

• Applications: Handheld/Mobile Devices
• Current - Supply: 5µA
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LP3927ILQ-AZ

Timing Diagrams
Keyboard Start-Up/Shut-Down
20037925
Note: Diagram indicates Open Drain IRQ tied to V
.
DD
*** = Internal signal
1. Keyboard de-bounce delay, 32 msec typ.
2. Delay between LDO1 reaching 95% of its output voltage and LDO2 enable, 125 µsec typical.
3. Both LDO1 and LDO2 outputs reach 95% of respective output voltage, start RST timer.
4. RST delay, 20 msec typical.
5. IRQ is active low.
6. Keyboard press must be greater than 32 msec.
7. PS_HOLD timer begins upon RST going high.
8. Maximum of 500 msec period from RST going high to PS_HOLD going high.
9. Response time from PS_HOLD going low to RST going low.
10. Delay between RST high-low transition to LDO2 disable.
11. Delay between LDO2 disable and LDO1 disable.
11
www.national.com