LP38859 3A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start | TI.com

LP38859 (ACTIVE) 3A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start

 

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Description

The LP38859 is a high-current, fast-response regulator which can maintain output voltage regulation with extremely low input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides voltage to drive the gate of the N-MOS power transistor, while VIN is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra-low VIN voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability.

The fast transient response of this device makes it suitable for use in powering DSP microcontroller core voltages and switch-mode power-supply post-regulators. The LP38859 is available in 5-pin TO-220 and DDPAK/TO-263 packages.

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • Input Voltage: 1.1 V to 5.5 V
  • Wide VBIAS Supply Operating Range: 3 V to 5.5 V
  • Standard VOUT Values: 0.8 V and 1.2 V
  • Stable With 10-µF Ceramic Capacitors
  • Dropout Voltage of 240 mV (typical) at 3-A Load Current
  • Programmable Soft-Start Time
  • Precision Output Voltage Across All Line and Load Conditions:
    • ±1% VOUT for TJ = 25°C
    • ±2% VOUT for 0°C ≤ TJ ≤ +125°C
    • ±3% VOUT for –40°C ≤ TJ ≤ +125°C
  • Overtemperature and Overcurrent Protection
  • Operating Temperature Range: −40°C to +125°C

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WEBENCH® Designer LP38859

  Min   Max Range
Vin  V 1.65 to 5.5V
Vout  V 1.2 to 1.2V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Output options Iout (Max) (A) Vin (Max) (V) Vin (Min) (V) Vout (Max) (V) Vout (Min) (V) Fixed output options (V) Package Group Features Regulated outputs (#) Operating temperature range (C) Thermal resistance θJA (°C/W) Noise (uVrms) Approx. price (US$) Rating PSRR @ 100 KHz (dB) Accuracy (%) Dropout voltage (Vdo) (Typ) (mV) Iq (Typ) (mA) Package size: mm2:W x L (PKG)
LP38859 Order now Fixed Output     3     5.5     1.15     1.2     0.8     0.8
1.2    
DDPAK/TO-263 | 5
TO-220 | 5    
Soft Start     1     -40 to 125     43     150     1.82 | 1ku     Catalog     37     1     350     10     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
5TO-220: 86 mm2: 8.47 x 10.16 (TO-220 | 5)    
LP38851 Order now Adjustable Output     0.8     5.5     0.915     1.8     0.8       DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
Enable
Soft Start    
1     -40 to 125     60     90     0.81 | 1ku     Catalog     50     2     115     10     7DDPAK/TO-263: 154 mm2: 15.24 x 10.1 (DDPAK/TO-263 | 7)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
7TO-220: 83 mm2: 8.13 x 10.16 (TO-220 | 7)    
LP38852 Order now Adjustable Output     1.5     5.5     0.93     1.8     0.8       DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
Enable
Soft Start    
1     -40 to 125     34     90     1.19 | 1ku     Catalog     35     3     130     10     7DDPAK/TO-263: 154 mm2: 15.24 x 10.1 (DDPAK/TO-263 | 7)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
7TO-220: 83 mm2: 8.13 x 10.16 (TO-220 | 7)    
LP38853 Order now Adjustable Output     3     5.5     1.04     1.8     0.8       DDPAK/TO-263 | 7
SO PowerPAD | 8
TO-220 | 7    
Enable
Soft Start    
1     -40 to 125     34     150     1.88 | 1ku     Catalog     35     2     240     10     7DDPAK/TO-263: 154 mm2: 15.24 x 10.1 (DDPAK/TO-263 | 7)
8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
7TO-220: 83 mm2: 8.13 x 10.16 (TO-220 | 7)    
LP38855 Order now Fixed Output     1.5