LP3927ILQ-AZ/NOPB National Semiconductor, LP3927ILQ-AZ/NOPB Datasheet - Page 14

• 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
(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.
www.national.com
14