LP38511-1.8 800 mA Fast-Transient Response Low-Dropout
Linear Voltage Regulator with Error Flag
May 14, 2008
LP38511-1.8
800 mA Fast-Transient Response Low-Dropout Linear
Voltage Regulator with Error Flag
General Description
The LP38511-1.8 Fast-Transient Response Low-Dropout
Voltage Regulator offers the highest-performance in meeting
AC and DC accuracy requirements for powering Digital
Cores. The LP38511-1.8 uses a proprietary control loop that
enables extremely fast response to change in line conditions
and load demands. Output Voltage DC accuracy is guaran-
teed at 鹵2.5% over line, load and full temperature range from
-40擄C to +125擄C. The LP38511-1.8 is designed for inputs
from the 2.5V, 3.3V, and 5.0V rail, is stable with 10uF ceramic
capacitors, and has a fixed 1.8V output. An Error Flag feature
monitors the output voltage and notifies the system processor
when the output voltage falls more than 15% below the nom-
inal value. The LP38511-1.8 provides excellent transient per-
formance to meet the demand of high performance digital
core ASICs, DSPs, and FPGAs found in highly-intensive ap-
plications such as servers, routers/switches, and base sta-
tions.
Features
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2.25V to 5.5V Input Voltage Range
1.8V Fixed Output Voltage
800 mA Output Load Current
+/- 2.5% V
OUT
Accuracy over Line, Load, and Full-
Temperature Range from -40擄C to +125擄C
Stable with tiny 10 碌F ceramic capacitors
0.20% Output Voltage Load Regulation from 10 mA to 800
mA
Enable pin
Error Flag Indicates Status of Output Voltage
1 碌A(chǔ) of Quiescent current in Shutdown
40dB of PSRR at 100 kHz
Over-Temperature and Over-Current Protection
TO263 and TO-263 THIN Surface Mount Packages
Applications
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Digital Core ASICs, FPGAs, and DSPs
Servers
Routers and Switches
Base Stations
Storage Area Networks
DDR2 Memory
Typical Application Circuit
20182901
漏 2008 National Semiconductor Corporation
201829
www.national.com
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