LP2954

Manufacturer Part NumberLP2954
ManufacturerTexas Instruments
LP2954 datasheet
 


Specifications of LP2954

Iout(max)(a)0.25Vdo(typ)(mv)800
Iq(typ)(ma)0.21Vin(min)(v)-20
Vin(max)(v)30Vout Adj(min)(v)1.23
Vout Adj(max)(v)29Output Capacitor TypeTantalum
Vout(min)(v)1.23Vout(max)(v)29
Pin/package3PFM, 3TO, 8SOIC  
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LP2954,LP2954A
LP2954/LP2954A 5V and Adjustable Micropower Low-Dropout Voltage Regulators
Literature Number: SNVS096C

LP2954 Summary of contents

  • Page 1

    ... LP2954,LP2954A LP2954/LP2954A 5V and Adjustable Micropower Low-Dropout Voltage Regulators Literature Number: SNVS096C ...

  • Page 2

    ... The quiescent current increases only slightly at dropout (120 µA typical), which prolongs battery life. The LP2954 with a fixed 5V output is available in the three- lead TO-220 and TO-263 packages. The adjustable LP2954 is provided in an 8-lead surface mount, small outline pack- age ...

  • Page 3

    ... Ordering Information Order Number LP2954AIT LP2954IT LP2954AIS LP2954IS LP2954AIM −40 to +125 LP2954IM www.national.com Temp. Range Package (T ) ˚C (JEDEC) J −40 to +125 TO-220 −40 to +125 TO-263 SO Package Number TO3B TS3B M08A ...

  • Page 4

    ... If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Operating Junction Temperature Range LP2954AI/LP2954I Electrical Characteristics Limits in standard typeface are for T J are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Un- ...

  • Page 5

    ... Symbol Parameter e Output Noise C n Voltage ( 100 kHz 100 Additional Specifications for the Adjustable Device (LP2954AIM and LP2954IM) V Reference Voltage (Note 10) REF ∆V / Reference Voltage V REF V Line Regulation VO(NOM)+1V REF V VO(NOM)+1V to 30V (Note 11) ∆ ...

  • Page 6

    ... If an external heatsink is used, the effective junction-to-ambient thermal resistance is the sum of the junction-to-case resistance (3˚C/W), the specified thermal resistance of the heatsink selected, and the thermal resistance of the interface between the heatsink and the LP2954. Some typical values are listed for interface materials used with TO-220: TABLE 1 ...

  • Page 7

    Typical Performance Characteristics Ground Pin Current vs Load Ground Pin Current Ripple Rejection www.national.com (Continued) 01112814 01112816 01112818 6 Ground Pin Current 01112815 Output Noise Voltage 01112817 Ripple Rejection 01112819 ...

  • Page 8

    Typical Performance Characteristics Ripple Rejection Line Transient Response Load Transient Response (Continued) Line Transient Response 01112820 01112822 Load Transient Response 01112824 7 01112821 Output Impedance 01112823 01112825 www.national.com ...

  • Page 9

    Typical Performance Characteristics Dropout Characteristics Short-Circuit Output Current and Maximum Output Current Application Hints EXTERNAL CAPACITORS A 2.2 µF (or greater) capacitor is required between the output pin and the ground to assure stability (refer to Figure 1). Without this ...

  • Page 10

    ... The minimum input voltage, including AC ripple on the filter capacitor , must not drop below the voltage required to keep the LP2954 in regulation also advisable to verify operating at minimum operating ambient temperature, since the increasing ESR of the filter capacitor makes this a worst-case test for dropout voltage due to increased ripple amplitude ...

  • Page 11

    Application Hints (Continued) DROPOUT DETECTION COMPARATOR This comparator produces a logic “LOW” whenever the out- put falls out of regulation by more than about 5%. This figure results from the comparator’s built-in offset divided by the 1.23V ...

  • Page 12

    Typical Applications *Output voltage equals +V minus dropout voltage, which varies with output current. Current limits at 380 mA (typical). IN Typical Application Circuit 01112801 5V Regulator 01112806 5V Current Limiter 01112807 11 www.national.com ...

  • Page 13

    Schematic Diagram www.national.com 12 01112808 ...

  • Page 14

    ... Physical Dimensions inches (millimeters) unless otherwise noted TO-220 3-Lead Plastic Package Order Number LP2954AIT or LP2954IT NS Package T03B 13 www.national.com ...

  • Page 15

    ... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) TO-263 3-Lead Plastic Surface Mount Package Order Number LP2954AIS or LP2954IS NS Package TS3B SO-8 Surface Mount Package Order Number LP2954AIM or LP2954IM NS Package Number M08A 14 ...

  • Page 16

    National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...

  • Page 17

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...