Atec L116b User Manual

LP38690 LP38692

1A Low Dropout CMOS Linear RegulatorsStable with Ceramic Output

Capacitors

General Description

The LP38690/2 low dropout CMOS linear regulators provide tight output tolerance (2.5% typical), extremely low dropout voltage (450mV @ 1A load current, V AC performance utilizing ultra low ESR ceramic output capacitors.

The low thermal resistance of the LLP, SOT-223 and T0-252 packages allow the full operating current to be used even in high ambient temperature environments.

The use of a PMOS power transistor means that no DC base drive current is required to bias it allowing ground pin current to remain below 100 µA regardless of load current, input voltage, or operating temperature.

Dropout Voltage: 450 mV (typ) @ 1A (typ. 5V out). Ground Pin Current: 55 µA (typ) at full load. Precision Output Voltage: 2.5% (25°C) accuracy.

= 5V), and excellent

OUT

Typical Application Circuits

Features

2.5% output accuracy (25°C)

●

Low dropout voltage: 450mV @ 1A (typ, 5V out)

●

Wide input voltage range (2.7V to 10V)

●

Precision (trimmed) bandgap reference

●

Guaranteed specs for -40°C to +125°C

●

1µA off-state quiescent current

●

Thermal overload protection

●

Foldback current limiting

●

T0-252, SOT-223 and 6-Lead LLP packages

●

Enable pin (LP38692)

●

Applications

Hard Disk Drives

●

Notebook Computers

●

Battery Powered Devices

●

Portable Instrumentation

●

Note:

* Minimum value required for stability.

**LLP package devices only.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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LP38690 LP38692

Connection Diagrams

TO-252, Top View

LP38690DT-X.X

6-Lead LLP, Top View

LP38690SD-X.X

Pin Descriptions

Pin Description

GND

SNS

OUT

DAP

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SOT-223, Top View

LP38692MP-X.X

6-Lead LLP, Top View

LP38692SD-X.X

This is the input supply voltage to the regulator. For LLP devices, both VIN pins must be tied together for full current operation (500mA maximum per pin).

Circuit ground for the regulator. For the TO-252 and SOT-223 packages this is thermally connected to the die and functions as a heat sink when the soldered down to a large copper plane.

Output sense pin allows remote sensing at the load which will eliminate the error in output voltage due to voltage drops caused by the resistance in the traces between the regulator and the load. This pin must be tied to V

OUT

The enable pin allows the part to be turned ON and OFF by pulling this pin high or low.

Regulated output voltage.

LLP Only - The DAP (Exposed Pad) functions as a thermal connection when soldered to a copper plane. See LLP MOUNTING section in Application Hints for more information.

Ordering Information

Order Number Package Marking Package Type Package Drawing Supplied As

LP38690SD-1.8 L113B 6-Lead LLP SDE06A 1000 Units Tape and Reel

LP38690SD-2.5 L114B 6-Lead LLP SDE06A 1000 Units Tape and Reel

LP38690SD-3.3 L115B 6-Lead LLP SDE06A 1000 Units Tape and Reel

LP38690SD-5.0 L116B 6-Lead LLP SDE06A 1000 Units Tape and Reel

LP38690DT-1.8 LP38690DT-1.8 TO-252 TD03B 75 Units per Rail

LP38690DT-2.5 LP38690DT-2.5 TO-252 TD03B 75 Units per Rail

LP38690DT-3.3 LP38690DT-3.3 TO-252 TD03B 75 Units per Rail

LP38690DT-5.0 LP38690DT-5.0 TO-252 TD03B 75 Units per Rail

LP38692SD-1.8 L123B 6-Lead LLP SDE06A 1000 Units Tape and Reel

LP38692SD-2.5 L124B 6-Lead LLP SDE06A 1000 Units Tape and Reel

LP38692SD-3.3 L125B 6-Lead LLP SDE06A 1000 Units Tape and Reel

LP38692SD-5.0 L126B 6-Lead LLP SDE06A 1000 Units Tape and Reel

LP38692MP-1.8 LJPB SOT-223 MP05A 1000 Units Tape and Reel

LP38692MP-2.5 LJRB SOT-223 MP05A 1000 Units Tape and Reel

LP38692MP-3.3 LJSB SOT-223 MP05A 1000 Units Tape and Reel

LP38692MP-5.0 LJTB SOT-223 MP05A 1000 Units Tape and Reel

LP38690SDX-1.8 L113B 6-Lead LLP SDE06A 4500 Units Tape and Reel

LP38690SDX-2.5 L114B 6-Lead LLP SDE06A 4500 Units Tape and Reel

LP38690SDX-3.3 L115B 6-Lead LLP SDE06A 4500 Units Tape and Reel

LP38690SDX-5.0 L116B 6-Lead LLP SDE06A 4500 Units Tape and Reel

LP38690DTX-1.8 LP38690DT-1.8 TO-252 TD03B 2500 Units Tape and Reel

LP38690DTX-2.5 LP38690DT-2.5 TO-252 TD03B 2500 Units Tape and Reel

LP38690DTX-3.3 LP38690DT-3.3 TO-252 TD03B 2500 Units Tape and Reel

LP38690DTX-5.0 LP38690DT-5.0 TO-252 TD03B 2500 Units Tape and Reel

LP38692SDX-1.8 L123B 6-Lead LLP SDE06A 4500 Units Tape and Reel

LP38692SDX-2.5 L124B 6-Lead LLP SDE06A 4500 Units Tape and Reel

LP38692SDX-3.3 L125B 6-Lead LLP SDE06A 4500 Units Tape and Reel

LP38692SDX-5.0 L126B 6-Lead LLP SDE06A 4500 Units Tape and Reel

LP38692MPX-1.8 LJPB SOT-223 MP05A 2000 Units Tape and Reel

LP38692MPX-2.5 LJRB SOT-223 MP05A 2000 Units Tape and Reel

LP38692MPX-3.3 LJSB SOT-223 MP05A 2000 Units Tape and Reel

LP38692MPX-5.0 LJTB SOT-223 MP05A 2000 Units Tape and Reel

For LP38690 Ordering and Availability Information see: http://www.national.com/pf/LP/LP38690.html#Order For LP38692 Ordering and Availability Information see: http://www.national.com/pf/LP/LP38692.html#Order

LP38690 LP38692

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.

Storage Temperature Range −65°C to +150°C Lead Temp. (Soldering, 5 seconds) 260°C ESD Rating (Note 3) 2 kV Power Dissipation (Note 2) Internally Limited V(max) All pins (with respect to GND) -0.3V to 12V I

OUT

Internally Limited

Junction Temperature −40°C to +150°C

Operating Ratings

VIN Supply Voltage 2.7V to 10V

Operating Junction Temperature Range

−40°C to +125°C

Electrical Characteristics Limits in standard typeface are for T

the full operating temperature range. Unless otherwise specified: VIN = V

OUT

= 25°C, and limits in boldface type apply over

+ 1V, CIN = C

limits are guaranteed through testing, statistical correlation, or design.

Symbol Parameter Conditions Min

-2.5 2.5

Output Voltage Tolerance

100 µA < IL < 1A

VO + 1V ≤ VIN ≤ 10V

ΔVO/ΔV

ΔVO/ΔI

Output Voltage Line Regulation

(Note 6)

Output Voltage Load Regulation (Note 7)

VO + 0.5V ≤ VIN ≤ 10V IL = 25mA

1 mA < IL < 1A VIN = VO + 1V

(VO = 1.8V) IL = 1A

(VO = 2.5V) IL = 0.1A IL = 1A

VIN - V

OUT

Dropout Voltage (Note 8)

(VO = 3.3V) IL = 0.1A IL = 1A

(VO = 5V) IL = 0.1A IL = 1A

Quiescent Current

VIN ≤ 10V, IL =100 µA - 1A

VEN ≤ 0.4V, (LP38692 Only)

IL(MIN) Minimum Load Current

Foldback Current Limit VIN - VO > 5V

VIN - VO ≤ 4V

VIN - VO < 4V 1500

PSRR Ripple Rejection VIN = VO + 2V(DC), with 1V(p-p) /

120Hz Ripple

Thermal Shutdown Activation (Junction Temp)

TSD (HYST) Thermal Shutdown Hysteresis

(Junction Temp)

= 10 µF, I

OUT

Typ

(Note 4)

= 10mA. Min/Max

LOAD

Max Units

-5.0 5.0

0.03 0.1 %/V

1.8 5 %/A

950 1600

800

650

450

145

1300

110

1000

100 800

55 100

0.001 1

100

450

55 dB

160

OUT

µA

°C

LP38690 LP38692

Symbol Parameter Conditions Min

Output Noise BW = 10Hz to 10kHz

VO = 3.3V

VO (LEAK) Output Leakage Current VO = VO(NOM) + 1V @ 10V

Enable Voltage (LP38692 Only) Output = OFF 0.4

0.7

0.5 12 µA

Typ

(Note 4)

Max Units

µV/

Output = ON, VIN = 4V 1.8

Output = ON, VIN = 6V 3.0

Output = ON, VIN = 10V 4.0

Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics. Specifications do not apply when operating the device outside of its rated operating conditions.

Note 2: At elevated temperatures, device power dissipation must be derated based on package thermal resistance and heatsink values (if a heatsink is used). The junction-to-ambient thermal resistance ( θ copper area (less than 0.1 square inch). If one square inch of copper is used as a heat dissipator for the TO-252, the θ SOT-223 package has a θ when soldered to a copper area of one square inch. The θ thermal vias used (refer to application note AN-1187 and the LLP MOUNTING section in this datasheet). If power dissipation causes the junction temperature to exceed specified limits, the device will go into thermal shutdown.

Note 3: ESD is tested using the human body model which is a 100pF capacitor discharged through a 1.5k resistor into each pin.

Note 4: Typical numbers represent the most likely parametric norm for 25°C operation.

Note 5: If used in a dual-supply system where the regulator load is returned to a negative supply, the output pin must be diode clamped to ground.

Note 6: Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.

Note 7: Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from 1mA to full load.

Note 8: Dropout voltage is defined as the minimum input to output differential required to maintain the output within 100mV of nominal value.

Enable Pin Leakage VEN = 0V or 10V, VIN = 10V -1 0.001 1

) for the TO-252 is approximately 90°C/W for a PC board mounting with the device soldered down to minimum

J-A

of approximately 125°C/W when soldered down to a minimum sized pattern (less than 0.1 square inch) and approximately 70°C/W

J-A

values for the LLP package are also dependent on trace area, copper thickness, and the number of

J-A

drops to approximately 50°C/W. The

J-A

µA

LP38690 LP38692

Block Diagrams

FIGURE 1. LP38690 Functional Diagram (LLP)

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FIGURE 2. LP38690 Functional Diagram (TO-252)

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