LP3907TLX-JJ11/NOPB National Semiconductor, LP3907TLX-JJ11/NOPB Datasheet - Page 28
![IC PMU DUAL DC/DC REG 25USMD](/photos/6/99/69997/tla25aaa_sml.jpg)
LP3907TLX-JJ11/NOPB
Manufacturer Part Number
LP3907TLX-JJ11/NOPB
Description
IC PMU DUAL DC/DC REG 25USMD
Manufacturer
National Semiconductor
Series
PowerWise®r
Type
Step-Down (Buck)r
Specifications of LP3907TLX-JJ11/NOPB
Topology
Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
Function
Any Function
Number Of Outputs
4
Frequency - Switching
2.1MHz
Voltage/current - Output 1
1.2V, 1A
Voltage/current - Output 2
1.8V, 600mA
Voltage/current - Output 3
2.85V, 300mA
W/led Driver
No
W/supervisor
No
W/sequencer
Yes
Voltage - Supply
2.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
25-MicroSMD
Current - Output
300mA, 600mA, 1A
Voltage - Output
1.2V, 1.8V
Voltage - Input
2.8 ~ 5.5 V
Power - Output
1.43W
Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LP3907TLX-JJ11
www.national.com
An internal Power-on reset of the IC is used with EN1, and
EN2 to produce a reset signal (LOW) to the delay timer nPOR.
EN1 and RDY1 or EN2 and RDY2 are used to generate the
set signal (HIGH) to the delay timer. S=R=1 never occurs. The
mask timers are triggered off EN1 and EN2 which are gated
with RDY1, and RDY2 to generate outputs to the final AND
gate to generate the nPOR.
Under Voltage Lock Out
The LP3907 features an “under voltage lock out circuit”. The
function of this circuit is to continuously monitor the raw input
supply voltage (VINLDO12) and automatically disables the
Design Implementation of the Flexible Power-On Reset
28
four voltage regulators whenever this supply voltage is less
than 2.8VDC.
The circuit incorporates a bandgap based circuit that estab-
lishes the reference used to determine the 2.8VDC trip point
for a V
used to gate the enable signals to the four regulators of the
LP3907. When VINLDO12 is greater than 2.8VDC the four
enables control the four regulators, when VINLDO12 is less
than 2.8VDC the four regulators are disabled by the V
tector being in the “Not OK” state. The circuit has built in
hysteresis to prevent chattering occurring.
IN
OK – Not OK detector. This V
IN
OK signal is then
30017812
IN
de-