LP2951-N Series of Adjustable Micropower Voltage Regulators | TI.com

LP2951-N (ACTIVE)

Series of Adjustable Micropower Voltage Regulators

 

Description

The LP2950-N and LP2951-N are micropower voltage regulators with very low quiescent current (75 µA typical) and very low dropout voltage (typical 40 mV at light loads and 380 mV at 100 mA). They are ideally suited for use in battery-powered systems. Furthermore, the quiescent current of the device increases only slightly in dropout, prolonging battery life.

Careful design of the LP2950-N/LP2951-N has minimized all contributions to the error budget. This includes a tight initial tolerance (0.5% typical), extremely good load and line regulation (0.05% typical) and a very low output voltage temperature coefficient, making the part useful as a low-power voltage reference.

One such feature is an error flag output which warns of a low output voltage, often due to falling batteries on the input. It may be used for a power-on reset. A second feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. Also, the part may be pin-strapped for a 5-V, 3-V, or 3.3-V output (depending on the version), or programmed from 1.24 V to 29 V with an external pair of resistors.

The LP2950-N is available in the surface-mount TO-252 package and in the popular 3-pin TO-92 package for pin-compatibility with older 5-V regulators. The 8-pin LP2951-N is available in plastic, ceramic dual-in-line, WSON, or metal can packages and offers additional system functions.

Features

  • Input Voltage Range: 2.3 V to 30 V
  • 5-V, 3-V, and 3.3-V Output Voltage Versions Available
  • High Accuracy Output Voltage
  • Ensured 100-mA Output Current
  • Extremely Low Quiescent Current
  • Low Dropout Voltage
  • Extremely Tight Load and Line Regulation
  • Very Low Temperature Coefficient
  • Use as Regulator or Reference
  • Needs Minimum Capacitance for Stability
  • Current and Thermal Limiting
  • Stable With Low-ESR Output Capacitors (10 mΩ to 6 Ω)
  • LP2951-N Versions Only:
    • Error Flag Warns of Output Dropout
    • Logic-Controlled Electronic Shutdown
    • Output Programmable From 1.24 V to 29 V

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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 Output capacitor type PSRR @ 100 KHz (dB) Accuracy (%) Vdo (Typ) (mV) Iq (Typ) (mA) Package size: mm2:W x L (PKG)
LP2951-N Order now Adjustable Output
Fixed Output    
0.1     30     2.3     29     1.24     3
3.3
5    
PDIP | 8
SOIC | 8
VSSOP | 8
WSON | 8    
Enable
Power Good    
1     -40 to 125     43     160     0.25 | 1ku     Catalog     Ceramic     51     2.5     380     0.075     See datasheet (PDIP)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)
See datasheet (WSON)    
LP2950 Order now Fixed Output     0.1     30     2     5     3     3
3.3
5    
TO-92 | 3    
   
1     -40 to 125     97     100     0.12 | 1ku     Catalog     Ceramic     57     3     110     0.075     3TO-92: 19 mm2: 3.68 x 5.2 (TO-92 | 3)    
LP2950-N Order now Fixed Output     0.1     30     2.3     5     3     3
3.3
5    
TO-252 | 3
TO-92 | 3    
   
1     -40 to 125     51     100     0.25 | 1ku     Catalog     Ceramic     51     3     380     0.075     3TO-252: 40 mm2: 6.1 x 6.58 (TO-252 | 3)
3TO-92: 19 mm2: 3.68 x 5.2 (TO-92 | 3)    
LP2951 Order now Adjustable Output
Fixed Output    
0.1     30     2     29     1.2     3
3.3
5    
SOIC | 8
SON | 8    
Enable
Power Good    
1     -40 to 125     52     160     0.18 | 1ku     Catalog     Non-Ceramic     57     3     380     0.075     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
See datasheet (SON)