LM3940

Manufacturer Part NumberLM3940
ManufacturerTexas Instruments
LM3940 datasheet
 


Specifications of LM3940

Iout(max)(a)1Vdo(typ)(mv)0.31
Iq(typ)(ma)0.11Vin(max)(v)7.5
Output Capacitor TypeTantalumVout(min)(v)3.3
Vout(max)(v)3.3Pin/package3PFM, 3TO, 4SOT
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
Page 1/14

Download datasheet (343Kb)Embed
Next
LM3940
LM3940 1A Low Dropout Regulator for 5V to 3.3V Conversion
Literature Number: SNVS114D

LM3940 Summary of contents

  • Page 1

    ... LM3940 LM3940 1A Low Dropout Regulator for 5V to 3.3V Conversion Literature Number: SNVS114D ...

  • Page 2

    ... Because the LM3940 is a true low dropout regulator, it can hold its 3.3V output in regulation with input voltages as low as 4.5V. The T0-220 package of the LM3940 means that in most ap- plications the full 1A of load current can be delivered without using an additional heatsink. The surface mount TO-263 package uses minimum board space, and gives excellent power dissipation capability when soldered to a copper plane on the PC board ...

  • Page 3

    ... Order Part Number LM3940WG-3.3-QML 5962-9688401QXA NSC Drawing Number WG16A www.national.com 1208027 Pin 2 and pin 7 are fused to center DAP Pin 5 and 6 need to be tied together on PCB board Order Part Number LM3940LD-3.3 1208028 2 8-Lead LLP 1208030 (Top View) NSC Drawing Number LDC08A ...

  • Page 4

    ... 100 rating for the LLP is with a JESD51-7 test board having 6 thermal vias JA 3 (Note 1) −40°C to +125° IN(MIN) O Typical LM3940 (Note 4) min max 3.20 3.40 3.3 3.13 3. 200 110 250 μV (rms) 150 ...

  • Page 5

    Typical Performance Characteristics Dropout Voltage Output Voltage vs. Temperature Quiescent Current vs. V www.national.com Dropout Voltage vs. Temperature 1208013 Quiescent Current vs. Temperature 1208015 Quiescent Current vs. Load IN 1208017 4 1208014 1208016 1208018 ...

  • Page 6

    Line Transient Response 1208019 Ripple Rejection 1208021 Output Impedance 1208023 Load Transient Response Low Voltage Behavior Peak Output Current 5 1208020 1208022 1208024 www.national.com ...

  • Page 7

    Application Hints EXTERNAL CAPACITORS The output capacitor is critical to maintaining regulator stabil- ity, and must meet the required conditions for both ESR (Equivalent Series Resistance) and minimum amount of ca- pacitance. MINIMUM CAPACITANCE: The minimum output capacitance required to ...

  • Page 8

    If a manufactured heatsink selected, the value of heatsink-to-ambient thermal resistance, θ calculated: θ = θ − θ − θ (H−A) (JA) (C−H) (J−C) Where: θ is defined as the thermal resistance from the (J−C) junction to ...

  • Page 9

    ... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 3-Lead SOT-223 Package Order Part Number LM3940IMP-3.3 NSC Package Number MP04A 3-Lead TO-220 Package Order Part Number LM3940IT-3.3 NSC Package Number TO3B 8 ...

  • Page 10

    ... TO-263 Package Order Part Number LM3940IS-3.3 NSC Package Number TS3B 16-Lead Ceramic Dual-in-Line Package Order Part Number LM3940J-3.3-QML 5962-9688401QEA NSC Drawing Number J16A 9 www.national.com ...

  • Page 11

    ... Ceramic Surface-Mount Package Order Part Number LM3940WG-3.3-QML 5962-9688401QXA NSC Package Number WG16A 8-Lead LLP Order Part Number LM3940LD-3.3 NSC Package Number LDC08A 10 ...

  • Page 12

    Notes 11 www.national.com ...

  • Page 13

    THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE ...

  • Page 14

    ... 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’ ...