MIC2954-07YM TR

Manufacturer Part NumberMIC2954-07YM TR
DescriptionImproved LP2954 Low Drop-out Regulator ( )
ManufacturerMicrel Inc
MIC2954-07YM TR datasheet
 


Specifications of MIC2954-07YM TR

Regulator TopologyPositive Fixed or AdjustableVoltage - Output5V, 1.24 ~ 29 V
Voltage - Input2 ~ 30 VVoltage - Dropout (typical)0.375V @ 250mA
Number Of Regulators1Current - Output250mA
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / Case8-SOIC (3.9mm Width)Lead Free Status / RoHS StatusLead free / RoHS Compliant
Current - Limit (min)-Other namesMIC2954-07YMTR
MIC2954-07YMTR
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General Description
The MIC2954 is a “bulletproof” efficient voltage regulator
with very low dropout voltage (typically 40mV @ light loads
and 375mV @ 250mA), and low quiescent current (120µA
typical). The quiescent current of the MIC2954 increases
only slightly in dropout, thus prolonging battery life. Key
MIC2954 features include protection against reversed
battery, fold-back current limiting, and automotive load
dump protection (60V positive transient).
The MIC2954-07/08BM is an adjustable version that
includes an error flag output that warns of a low output
voltage, which is often due to failing batteries on the input.
This may also be used as a power-on reset. A logic-
compatible shutdown input is provided which enables the
regulator to be switched on and off. This part may be pin-
strapped for 5V output, or programmed from 1.24V to 29V
with the use of two external resistors.
The MIC2954 is available in two voltage tolerances, ±0.5%
maximum and ±1% maximum. Both are guaranteed for
junction temperatures from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
___________________________________________________________________________________________________________
Ordering Information
Part Number
Pb-Free /
Standard
RoHS Compliant
MIC2954-02BT
MIC2954-02WT*
MIC2954-03BT
MIC2954-03WT*
MIC2954-02BS
MIC2954-02WS*
MIC2954-03BS
MIC2954-03WS*
MIC2954-02BZ
MIC2954-02YZ
MIC2954-03BZ
MIC2954-03YZ
MIC2954-07BM
MIC2954-07YM
MIC2954-08BM
MIC2954-08YM
* RoHS compliant with ‘high-melting solder’ exemption.
** TO-92 package discontinuance notification issued September 2007. End-of-life-buy offered thru December 31, 2007.
Contact factory for additional information.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
September 2007
250mA Low-Dropout Regulator
Features
• High-accuracy 5V, guaranteed 250mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Input can withstand –20V reverse battery and+60V
positive transients
• Error flag warns of low output voltage
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 29V
(MIC2954-07/08)
• Available in TO-220, TO-92, and surface-mount SOT-
223 and SOIC-8 packages
Applications
• Battery powered equipment
• Cellular telephones
• Laptop, notebook, and palmtop computers
• PCMCIA V
CC
• Bar code scanners
• Automotive electronics
• SMPS post-regulator/dc-to-dc modules
• Voltage reference
• High-efficiency linear power supplies
Junction
Accuracy
Temp. Range
0.5%
–40° to +125°C
1.0%
–40° to +125°C
0.5%
–40° to +125°C
1.0%
–40° to +125°C
0.5%
–40° to +125°C
1.0%
–40° to +125°C
0.5%
–40° to +125°C
1.0%
–40° to +125°C
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
MIC2954
and V
regulation/switching
PP
Package
TO-220-3
TO-220-3
SOT-223-3
SOT-223-3
TO-92-3**
TO-92-3**
8-Pin SOIC
8-Pin SOIC
M9999-090607

MIC2954-07YM TR Summary of contents

  • Page 1

    ... This part may be pin- strapped for 5V output, or programmed from 1.24V to 29V with the use of two external resistors. The MIC2954 is available in two voltage tolerances, ±0.5% maximum and ±1% maximum. Both are guaranteed for junction temperatures from –40°C to +125°C. ...

  • Page 2

    ... Selectable Regulator with Shutdown September 2007 100k MIC2954 OUT 3 5 SHDN ERR SHUTDOWN 7 FB ENABLE GND V 4 ⎛ R1 ⎞ REF ⎜ ⎟ OUT REF ⎝ ⎠ OPEN Adjustable Regulator Wide Input-Voltage-Range Current Limiter 2 MIC2954 V ERR V OUT 1.2V to 30V R1 10µF 100pF R2 M9999-090607 ...

  • Page 3

    ... Feedback (Input): Error amplifier input. Compared to internal1.23V FB reference. Connect to external voltage divider for adjustable operation or internal voltage divider (TAP) for 5V operation (see SNS, TAP GND OUT 3-Pin SOT-223 (S) 3-Pin TO-220 (T) = 5V) for fixed5V operation; also see TAP. OUT ) undervoltage condition. OUT M9999-090607 MIC2954 3 OUT 2 GND 1 IN ...

  • Page 4

    ... Supply Voltage (V Junction Temperature (T Package Thermal Resistance (θ ≤ 0.6V. All versions: V OUT SHDN Condition MIC2954-02/-07 (±0.5%) MIC2954-02/-07 (±0.5%), 1mA ≤ I MIC2954-03/-08 (±1%) MIC2954-03/-08 (±1%), 1mA ≤ I MIC2954-02/-07 (±0.5%) MIC2954-03/-08 (±1%) MIC2954-02/-07 (±0.5%), V MIC2954-03/-08 (±1%), V MIC2954-02/-07 (±0.5%), I MIC2954-03/-08 (±1%), 1mA 50mA ...

  • Page 5

    ... Shutdown Pin Input Current Regular Output Current in Shutdown September 2007 Condition OUT I = 100mA 2.2µ 100mA 33µ MIC2954-02/-07 (±0.5%) MIC2954-03/-08 (±1%) MIC2954-02/-07 (±0.5%), Note 13 MIC2954-03/-08 (±1%), Note 13 MIC2954-02/-07 (±0.5%) MIC2954-03/-08 (±1 30V 4.5V 400µ Note 14 Note 14 Note 14 low (on) high (off 2.4V SHDN ...

  • Page 6

    ... Information: Thermal Calculation”). 6. Output voltage temperature coefficient is defined as the worst case voltage change divide by the total temperature range. 7. Line regulation for the MIC2954 is tested at 125°C for I See “Typical Characteristics” for line regulation versus temperature and load current. ...

  • Page 7

    ... Micrel, Inc. Typical Characteristics September 2007 7 MIC2954 M9999-090607 ...

  • Page 8

    ... Micrel, Inc. Typical Characteristics September 2007 8 MIC2954 M9999-090607 ...

  • Page 9

    ... Micrel, Inc. Functional Diagrams Unregulated DC Supply September 2007 IN Error Amp. 182k 62k 1.23V REF. MIC2954-02/-03 MIC2954-02 and MIC2954-03 MIC2954-07 and MIC2954-08 9 OUT 5V/250mA Output 2.2µF GND M9999-090607 MIC2954 ...

  • Page 10

    ... For the worst-case situation of a 250mA load at 1.23V output (output shorted to feedback) a 5µF (or greater) capacitor should be used. The MIC2954 will remain in regulation with a minimum load of 1mA. When setting the output voltage of the MIC2954-07/-08 version with external resistors, the current through these resistors may be included as a portion of the minimum load. A 0.1µ ...

  • Page 11

    ... Automotive Applications The MIC2954 is ideally suited for automotive applica- tions for a variety of reasons. It will operate over a wide range of input voltages with very low dropout voltages (40mV at light loads), and very low quiescent currents (75µ ...

  • Page 12

    ... Micrel, Inc. Schematic Diagram September 2007 12 MIC2954 M9999-090607 ...

  • Page 13

    ... Seat ing Plane 0.025 (0.635) Max Uncont rolled Lead Diamet er 0.500 (12.70) Min. 0.016 (0.406) 0.014 (0.356) 0.0155 (0.3937 ) 0.055 (1.397) 0.0145 (0.3683 ) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 3-Pin TO-92 (Z) 13 5° typ. 5° typ. M9999-090607 MIC2954 ...

  • Page 14

    ... Micrel, Inc. September 2007 3-Pin SOT-223 (S) 3-Pin TO-220 (T) 14 MIC2954 M9999-090607 ...

  • Page 15

    ... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully September 2007 indemnify Micrel for any damages resulting from such use or sale. © 2001 Micrel, Incorporated. 15 MIC2954 M9999-090607 ...