LP3855EMP-ADJ/NOPB National Semiconductor, LP3855EMP-ADJ/NOPB Datasheet

IC REG LDO 1.5A ADJ SOT223-5

LP3855EMP-ADJ/NOPB

Manufacturer Part Number
LP3855EMP-ADJ/NOPB
Description
IC REG LDO 1.5A ADJ SOT223-5
Manufacturer
National Semiconductor

Specifications of LP3855EMP-ADJ/NOPB

Regulator Topology
Positive Adjustable
Voltage - Output
Adjustable
Voltage - Input
2.5 ~ 7 V
Voltage - Dropout (typical)
0.26V @ 1.5A
Number Of Regulators
1
Current - Output
1.5A (Max)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-223 (4 leads + Tab)
Primary Input Voltage
7V
Dropout Voltage Vdo
240mV
No. Of Pins
5
Output Current
1.5A
Operating Temperature Range
-40°C To +125°C
Msl
MSL 1 - Unlimited
Filter Terminals
SMD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
LP3855EMP-ADJ
LP3855EMP-ADJTR
© 2008 National Semiconductor Corporation
LP3855-ADJ
1.5A Fast Response Ultra Low Dropout Linear Regulators
General Description
The LP3855-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 LP3855-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 LP3855-ADJ to operate under extremely
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.
Adjustable Output Voltage: The output voltage may be pro-
grammed via two external resistors.
Typical Application Circuit
**See Application Hints.
200743
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
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
September 2, 2008
20074334
www.national.com

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LP3855EMP-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. © 2008 National Semiconductor Corporation Features ■ Ultra low dropout voltage ■ Stable with selected ceramic capacitors ■ ...

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 # Pin Descriptions for SOT223-5 Package Pin # www.national.com ...

Page 3

... Ordering Information Package Type Designator is "T" for TO220 package, and "S" for TO263 package. TABLE 1. Package Marking and Ordering Information Output Order Number Voltage ADJ LP3855EMP-ADJ ADJ LP3855EMPX-ADJ ADJ LP3855ES-ADJ ADJ LP3855ESX-ADJ ADJ LP3855ET-ADJ Current Description Package Type 1.5A SOT223-5 1.5A SOT223-5 1 ...

Page 4

Block Diagram www.national.com LP3855-ADJ 4 20074329 ...

Page 5

... 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 6

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 7

Typical Performance Characteristics C = 10µF, S/D pin is tied OUT Dropout Voltage vs Output Load Current Shutdown I vs Junction Temperature Q DC Line Regulation vs Temperature Unless otherwise specified 2.5V, ...

Page 8

Noise vs Frequency Load Transient Response ( 100µF,OSCON) IN OUT Load Transient Response ( 10µF,TANTALUM) IN OUT www.national.com Load Transient Response ( 20074361 Load Transient Response ( 20074377 ...

Page 9

Load Transient Response 10µF CERAMIC 10µF CERAMIC OUT Application Hints SETTING THE OUTPUT VOLTAGE The output voltage is set using the resistors R1 and R2 (see Typical Application Circuit). The output ...

Page 10

Figure 2, which graphs the maximum stable value of ceramic output capacitance as a function of ceramic input capacitance for load currents of 1.5A. FIGURE 2. Maximum Ceramic Output Capacitance vs Ceramic Input Capacitance If the ...

Page 11

It should be noted that stability problems have been seen in applications where "vias" internal ground plane were used at the ground points of ...

Page 12

The LP3855-ADJ is available in TO-220 and TO-263 pack- ages. The thermal resistance depends on amount of copper area or heat sink, and on air flow. If the maximum allowable ≥ value of θ calculated above is 60 °C/W for ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted TO220 5-lead, Molded, Stagger Bend Package (TO220-5) For Order Numbers, refer to the “Ordering Information” section of this document. NS Package Number T05D 13 www.national.com ...

Page 14

TO263 5-Lead, Molded, Surface Mount Package (TO263-5) For Order Numbers, refer to the “Ordering Information” section of this document. www.national.com NS Package Number TS5B 14 ...

Page 15

SOT223, 5-Lead, Molded, Surface Mount Package (SOT223-5) NS Package Number MP05A For Order Numbers, refer to the “Ordering Information” section of this document. 15 www.national.com ...

Page 16

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