LP3855ESX-1.8/NOPB National Semiconductor, LP3855ESX-1.8/NOPB Datasheet

IC REG LDO 1.5A 1.8V TO-263-5

LP3855ESX-1.8/NOPB

Manufacturer Part Number
LP3855ESX-1.8/NOPB
Description
IC REG LDO 1.5A 1.8V TO-263-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3855ESX-1.8/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
1.8V
Voltage - Input
2.5 ~ 7 V
Number Of Regulators
1
Current - Output
1.5A (Max)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-5, D²Pak (5 leads + Tab), TO-263BA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Dropout (typical)
-
Current - Limit (min)
-
Other names
LP3855ESX-1.8
© 2011 National Semiconductor Corporation
1.5A Fast Response Ultra Low Dropout Linear Regulators
General Description
The LP3852/LP3855 series of fast ultra low-dropout linear
regulators operate from a +2.5V to +7.0V input supply. Wide
range of preset output voltage options are available. These
ultra low dropout linear regulators respond very quickly to step
changes in load, which makes them suitable for low voltage
microprocessor applications. The LP3852/LP3855 are devel-
oped on a CMOS process which allows low quiescent current
operation independent of output load current. This CMOS
process also allows the LP3852/LP3855 to operate under ex-
tremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 24mV
at 150mA load current and 240mV at 1.5A load current.
Ground Pin Current: Typically 4mA at 1.5A load current.
Shutdown Mode: Typically 10nA quiescent current when the
shutdown pin is pulled low.
Error Flag: Error flag goes low when the output voltage drops
10% below nominal value.
SENSE: Sense pin improves regulation at remote loads.
Precision Output Voltage: Multiple output voltage options
are available ranging from 1.8V to 5.0V with a guaranteed
accuracy of ±1.5% at room temperature, and ±3.0% over all
conditions (varying line, load, and temperature).
Typical Application Circuits
**SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this function is not used. See Application
Hints for more information.
**SD must be pulled high through a 10kΩ pull-up resistor. See Application Hints for more information.
200310
LP3852/LP3855
Features
Applications
Ultra low dropout voltage
Stable with selected ceramic capacitors
Low ground pin current
Load regulation of 0.06%
10nA quiescent current in shutdown mode
Guaranteed output current of 1.5A DC
Available in TO-263, TO-220 and SOT-223 packages
Output voltage accuracy ± 1.5%
Error flag indicates output status
Sense option improves load regulation
Overtemperature/overcurrent protection
−40°C to +125°C junction temperature range
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
March 9, 2011
www.national.com
20031001
20031034

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LP3855ESX-1.8/NOPB Summary of contents

Page 1

... ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this function is not used. See Application Hints for more information. **SD must be pulled high through a 10kΩ pull-up resistor. See Application Hints for more information. © 2011 National Semiconductor Corporation LP3852/LP3855 Features ■ ...

Page 2

Connection Diagrams Top View TO220-5 Package Bent, Staggered Leads Top View SOT223-5 Package Pin Descriptions for TO220-5 and TO263-5 Packages Pin # Name GND V 4 OUT 5 ERROR Pin Descriptions for SOT223-5 Package ...

Page 3

... LP3852ES-1.8 1.8 LP3852ESX-1.8 1.8 LP3852EMP-1.8 1.8 LP3852EMPX-1.8 5.0 LP3855EMP-5.0 5.0 LP3855EMPX-5.0 5.0 LP3855ES-5.0 5.0 LP3855ESX-5.0 3.3 LP3855EMP-3.3 Description Package Type (Current, Option) 1.5A, Error Flag SOT223-5 1.5A, Error Flag SOT223-5 1.5A, Error Flag TO263-5 1.5A, Error Flag TO263-5 1.5A, Error Flag SOT223-5 1 ...

Page 4

... LP3855EMPX-3.3 3.3 LP3855ES-3.3 3.3 LP3855ESX-3.3 2.5 LP3855EMP-2.5 2.5 LP3855EMPX-2.5 2.5 LP3855ES-2.5 2.5 LP3855ESX-2.5 1.8 LP3855EMP-1.8 1.8 LP3855EMPX-1.8 1.8 LP3855ES-1.8 1.8 LP3855ESX-1.8 5.0 LP3852ET-5.0 3.3 LP3852ET-3.3 2.5 LP3852ET-2.5 1.8 LP3852ET-1.8 5.0 LP3855ET-5.0 3.3 LP3855ET-3.3 2.5 LP3855ET-2.5 1.8 LP3855ET-1.8 www.national.com Description Package Type (Current, Option) 1 ...

Page 5

Block Diagrams LP3852 20031003 LP3855 5 20031029 www.national.com ...

Page 6

... 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 7

Symbol Parameter Shutdown Input V Shutdown Threshold SDT T Turn-off delay dOFF T Turn-on delay dON I SD Input Current SD Error Flag V Threshold T V Threshold Hysteresis TH V Error Flag Saturation EF(Sat) Td Flag Reset Delay I ...

Page 8

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

Page 9

Over Temperature IN OUT 20031060 Load Transient Response 10µF, OSCON IN OUT 20031081 Load Transient Response 100µF, POSCAP IN OUT 20031083 Noise vs Frequency Load Transient Response C = ...

Page 10

Load Transient Response 100µF, TANTALUM IN OUT Load Transient Response 10µF CERAMIC 10µF CERAMIC OUT www.national.com Load Transient Response OUT 20031085 20031094 10 = ...

Page 11

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, external capacitors are re- quired to assure stability. these capacitors must be correctly selected for proper performance. INPUT CAPACITOR: An input capacitor of at least 10µF is required. Ceramic or Tantalum may ...

Page 12

Of course, they are typi- cally larger and more costly than Z5U/Y5U types for a given voltage and capacitance. TANTALUM: Solid Tantalum capacitors are typically recom- ...

Page 13

LP3852/LP3855 achieves low noise performance and low quiescent current operation. The total output noise specification for LP3852/LP3855 is presented in the Electrical Characteristics table. The Output noise density at different frequencies is represented by ...

Page 14

FIGURE 4. Improving remote load regulation using LP3855 SHUTDOWN OPERATION A CMOS Logic low level signal at the shutdown ( SD) pin will turn-off the regulator. Pin SD must be actively terminated through a 10kΩ pull-up resistor for a proper ...

Page 15

HEATSINKING TO-263 PACKAGE The TO-263 package uses the copper plane on the PCB as a heatsink. The tab of these packages are soldered to the copper plane for heat sinking. Figure 5 shows a curve for the θ of TO-263 ...

Page 16

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 16 ...

Page 17

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. 17 www.national.com ...

Page 18

SOT223, 5-Lead, Molded, Surface Mount Package (SOT223-5) For Order Numbers, refer to the “Ordering Information” section of this document. www.national.com NS Package Number MP05A 18 ...

Page 19

Notes 19 www.national.com ...

Page 20

... 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 ...

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