IC REG LDO 3A ADJ VOLT TO-263-5

LP3856ES-ADJ/NOPB

Manufacturer Part NumberLP3856ES-ADJ/NOPB
DescriptionIC REG LDO 3A ADJ VOLT TO-263-5
ManufacturerNational Semiconductor
LP3856ES-ADJ/NOPB datasheet
 


Specifications of LP3856ES-ADJ/NOPB

Regulator TopologyPositive AdjustableVoltage - OutputAdjustable
Voltage - Input2.5 ~ 7 VVoltage - Dropout (typical)0.39V @ 3A
Number Of Regulators1Current - Output3A (Max)
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / CaseTO-263-5, D²Pak (5 leads + Tab), TO-263BAPrimary Input Voltage7V
Dropout Voltage Vdo390mVNo. Of Pins5
Output Current3AOperating Temperature Range-40°C To +125°C
MslMSL 3 - 168 HoursFilter TerminalsSMD
Rohs CompliantYesLead Free Status / RoHS StatusLead free / RoHS Compliant
Current - Limit (min)-Other names*LP3856ES-ADJ
*LP3856ES-ADJ/NOPB
LP3856ES-ADJ
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3A Fast Response Ultra Low Dropout Linear Regulators
General Description
The LP3856-ADJ fast ultra low-dropout linear regulators op-
erate from a +2.5V to +7.0V input supply. These ultra low
dropout linear regulators respond very quickly to step
changes in load, which makes them suitable for low voltage
microprocessor applications. The LP3856-ADJ is developed
on a CMOS process which allows low quiescent current op-
eration independent of output load current. This CMOS pro-
cess also allows the LP3856-ADJ to operate under extremely
low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 39mV
at 300mA load current and 390mV at 3A load current.
Ground Pin Current: Typically 4mA at 3A load current.
Shutdown Mode: Typically 10nA quiescent current when the
shutdown pin is pulled low.
Adjustable Output Voltage: The output voltage may be pro-
grammed via two external resistors.
Typical Application Circuit
**See Application Hints
© 2011 National Semiconductor Corporation
LP3856-ADJ
Features
Ultra low dropout voltage
Stable with selected ceramic capacitors
Low ground pin current
Load regulation of 0.08%
10nA quiescent current in shutdown mode
Guaranteed output current of 3A DC
Available in TO-263 and TO-220 packages
Overtemperature/overcurrent protection
−40°C to +125°C junction temperature range
Applications
Microprocessor power supplies
GTL, GTL+, BTL, and SSTL bus terminators
Power supplies for DSPs
SCSI terminator
Post regulators
High efficiency linear regulators
Battery chargers
Other battery powered applications
200742
March 4, 2011
20074234
www.national.com

LP3856ES-ADJ/NOPB Summary of contents

  • Page 1

    ... Shutdown Mode: Typically 10nA quiescent current when the shutdown pin is pulled low. Adjustable Output Voltage: The output voltage may be pro- grammed via two external resistors. Typical Application Circuit **See Application Hints © 2011 National Semiconductor Corporation LP3856-ADJ Features ■ Ultra low dropout voltage ■ ...

  • Page 2

    ... Input Supply IN GND Ground V Output Voltage OUT ADJ Set Output Voltage TABLE 1. Package Marking and Ordering Information Current Description Package Type 3A TO263-5 3A TO263-5 3A TO220-5 2 20074206 Top View TO263-5 Package Function 20074231 Package Marking Supplied As: LP3856ES-ADJ Rail LP3856ES-ADJ Tape and Reel LP3856ET-ADJ Rail ...

  • Page 3

    Block Diagram LP3856-ADJ 3 20074229 www.national.com ...

  • Page 4

    ... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Lead Temperature (Soldering, 5 sec.) ESD Rating (Note 3) Power Dissipation (Note 2) Input Supply Voltage (Survival) Shutdown Input Voltage (Survival) ...

  • Page 5

    Symbol Parameter Shutdown Input V Shutdown Threshold SDT T Turn-off delay dOFF T Turn-on delay dON I SD Input Current SD AC Parameters PSRR Ripple Rejection ρ Output Noise Density n(l/f e Output Noise Voltage n Note 1: Absolute maximum ...

  • Page 6

    Typical Performance Characteristics C = 10µF, S/D pin is tied Dropout Voltage vs Output Load Current Ground Current vs Output Voltage IL=3A DC Load Reg. vs Junction Temperature www.national.com Unless otherwise specified ...

  • Page 7

    Over Temperature IN OUT 20074260 Load Transient Response 10µF, OSCON IN OUT 20074271 Load Transient Response 100µF, POSCAP IN OUT 20074273 Noise vs Frequency Load Transient Response C = ...

  • Page 8

    Load Transient Response 100µF, TANTALUM IN OUT Load Transient Response 100µF, OSCON IN OUT Load Transient Response 10µF, TANTALUM IN OUT www.national.com Load Transient Response ...

  • Page 9

    Load Transient Response 10µF CERAMIC 10µF CERAMIC OUT 20074291 Load Transient Response 10µF CERAMIC 10µF CERAMIC OUT 20074293 Load Transient Response C ...

  • Page 10

    Application Hints SETTING THE OUTPUT VOLTAGE The output voltage is set using the resistors R1 and R2 (see Typical Application Circuit). The output is also dependent on the reference voltage (typically 1.216V) which is measured at the ADJ pin. The ...

  • Page 11

    If the maximum load current is 2A and a 10µF ceramic input capacitor is used, the regulator will be stable with ceramic output capacitor values from 10µ about 50µ load current, the ratio of input ...

  • Page 12

    IC load is connected to the IC output which switches at high speed (such as a clock), the high-frequency ...

  • Page 13

    TO220 package. The value for θ method of attachment, insulator, etc. θ CH C/W to 2.5°C/W. If the exact value is unknown, 2°C/W can be assumed. ...

  • Page 14

    Physical Dimensions TO220 5-lead, Molded, Stagger Bend Package (TO220-5) For Order Numbers, refer to the “Ordering Information” section of this document. www.national.com inches (millimeters) unless otherwise noted NS Package Number T05D 14 ...

  • Page 15

    TO263 5-Lead, Molded, Surface Mount Package (TO263-5) NS Package Number TS5B For Order Numbers, refer to the “Ordering Information” section of this document. 15 www.national.com ...

  • Page 16

    ... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...