National Semiconductor Supplier Page

LP38512 - 1.5A Fast-Transient Response
Low-Dropout Linear Voltage Regulator


LP38512-ADJ (Adjustable) and LP38512-1.8 (Fixed 1.8V Output) - Now Available at Digi-Key

National Semiconductor's LP38512-ADJ and LP38512-1.8 fast-transient response low-dropout voltage regulators offer high-performance that meets AC and DC accuracy requirements for powering digital cores. They both use a proprietary control loop that enables extremely fast response to change in line conditions and load demands. Output voltage DC accuracy is guaranteed at 2.5% over line, load and full temperature range from -40°C to +125°C.

LP38512-ADJ Datasheet     LP38512-1.8 Datasheet
National Semiconductor LP38512 - 1.5A Fast-Transient Response Low-Dropout Linear Voltage Regulator
  • Overview
  • Features & Applications
  • Specifications
  • Buy Now


Overview

The LP38512-ADJ is designed for inputs from the 2.5V, 3.3V, and 5.0V rail is stable with 10 µF ceramic capacitors. The LP38512-ADJ has an adjustable output voltage, while the LP38512-1.8 has a fixed 1.8V output. The LP38512-1.8 has an error flag feature that monitors the output voltage and notifies the system processor when the output voltage falls more than 15% below the nominal value. Both provide excellent transient performance to meet the demand of high performance digital core ASICs, DSPs, and FPGAs found in highly-intensive applications such as servers, routers/switches, and base stations.


LP38512-ADJ Features
  • 2.25V to 5.5V input voltage range
  • Adjustable output voltage range of 0.5V to 4.5V
  • 1.5A output load current
  • ±2.0% accuracy over line, load, and full-temperature range from -40°C to +125°C
  • Stable with tiny 10 µF ceramic capacitors
  • Enable pin
  • Typically less than 1µA of ground pin current in when enable pin is low
  • 25dB of PSRR at 100kHz
  • Over-temperature and over-current protection
  • PSOP-8 and TO263 thin surface mount packages

Applications
  • Digital Core ASICs, FPGAs, and DSPs
  • Servers
  • Routers and switches
  • Base stations
  • Storage area networks
  • DDR2 memory

LP38512-1.8 Features
  • 2.25V to 5.5V input voltage range
  • 1.8V fixed output voltage
  • 1.5A output load current
  • ±2.5% accuracy over line, load, and full-temperature range from -40°C to +125°C
  • Stable with tiny 10 µF ceramic capacitors
  • 0.20% output voltage load regulation from 10 mA to 1.5A
  • Enable pin
  • Error flag indicates status of output voltage
  • 1µA of quiescent current in shutdown
  • 40dB of PSRR at 100kHz
  • Over-temperature and over-current protection
  • TO-263 and TO-263 thin surface mount packages

Applications
  • Digital core ASICs, FPGAs, and DSPs
  • Servers
  • Routers and switches
  • Base stations
  • Storage area networks
  • DDR2 memory


LP38512-ADJ Specifications

LP38512-1.8 Specifications

Output current
1500mA
Output min
0.5V
Input min voltage
2.25V
Input max voltage
5.5V
Dropout voltage
0.300V
Adjustable output
Yes
Quiescent current
10mA
PSRR
73dB
Voltage noise (rms)
25µV
Ceramic capacitors stable
Yes
Feedback tolerance
2.0%
On/Off pin
Yes
Error flag
No
Reg type
LDO
Temperature min
-40°C
Temperature max
+125°C
Output max
4.5V
Feedback voltage
0.5V
 
Output current
1500mA
Input min voltage
2.25V
Input max voltage
5.50V
Dropout voltage
0.300V
Adjustable output
No
Quiescent current
7.5mA
PSRR
73dB
Voltage noise (rms)
75µV
Ceramic capacitors stable
Yes
On/Off pin
Yes
Error flag
Yes
Reg type
LDO
Temperature min
-40°C
Temperature max
+125°C
Output voltage
1.8V


Buy Now

Adjustable
National Semiconductor
Part Number
Digi-Key
Part Number
Voltage -
Input
Voltage -
Output
Package/Case
LP38512MR-ADJ/NOPB
2.25 ~ 5.5V
0.5 ~ 4.5V
PSOP-8
LP38512TJ-ADJ/NOPB
2.25 ~ 5.5V
0.5 ~ 4.5V
TO-263 Thin (5 leads + tab)
 LP38512TJ-ADJ/NOPB available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)

Fixed
National Semiconductor
Part Number
Digi-Key
Part Number
Voltage -
Input
Voltage -
Output
Package/Case
LP38512TS-1.8/NOPB
2.25 ~ 5.5V
1.8V
D2Pak, SMD-220, TO-263
(5 leads + tab)
LP38512TJ-1.8/NOPB
2.25 ~ 5.5V
1.8V
TO-263 Thin (5 leads + tab)
 LP38512TJ-1.8/NOPB available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)