EC8812|1.5A Low Dropout Linear Regulator


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1.5A Low Dropout Linear Regulator

EC8812

General Description

The EC8812 series of fixed output ultra low dropout linear regulators are designed for portable battery powered applications, which require low power consumption and low dropout voltage. ​​ Each device contains a bandgap voltage reference, an error amplifier, a PMOS power transistor, and current limit and temperature limit protection circuits.

The EC8812 is designed to work with low cost electrolytic and ceramic capacitors and requires a minimum output capacitor of 10μF. ​​ 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Typical Application

 

Features

  • Typical 150mV Dropout Voltage at 500mA.

  • Output Voltages0.8V to 3.9V0.1V Step

  • Excellent Line and Load Regulation.

  • High Accuracy Output Voltage of 2%.

  • Ultra-Low Ground Current at 150μA (Typ.)

  • Thermal and Over-Current Protection.

  • Short Circuit Protection

  • Standard SOT-223 and TO-252 Package.

 

Applications

  • USB removable devices

  • MPEG4 devices

  • Wireless LAN’s

  • Hand-Held Instrumentation.

  • Portable DVD players

  • Digital camera

 

Pin Configurations

Pin Description

Pin Name

Pin Function Description

GND

Ground

OUT

Output Voltage

IN

Input Voltage

Functional Block Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ordering Information

  • SOT223 Package

  • TO252-3L Package


 

 

 

 

 

Marking Information

  • SOT223:

Device

Marking Information

Package Type

​​ (Pin Type)

Remarks

​​ EC8812NNAB7R

12NNA

LLLLLL

SOT223

(Pin Type:A Type)

NN is Output Voltage(Ex:33=3.3V)

LLLLLL:Date Code

EC8812NNBB7R

12NNB

LLLLLL

SOT223

(Pin Type:A Type)

NN is Output Voltage(Ex:33=3.3V)

LLLLLL:Date Code

  • TO252-3L:

Device

Marking Information

Package Type

​​ (Pin Type)

Remarks

​​ EC881212A4TR

8812

12TYW

TO252-3L

(T Type)

  • Y:Year code(D=2013;E=2014;

F=2015)

  • W:Week Code(The big character of A~Z is for the week of 1~26, and small a~z is for the week of 27~52.)

EC881215A4TR

8812

15TYW

EC881218A4TR

8812

18TYW

EC881225A4TR

8812

25TYW

EC881233A4TR

8812

33TYW

​​ EC881212A4GR

8812

12GYW

TO252-3L

(G Type)

EC881215A4GR

8812

15GYW

EC881218A4GR

8812

18GYW

EC881225A4GR

8812

25GYW

EC881233A4GR

8812

33GYW

 

 

Absolute Maximum Ratings

Parameter

Symbol

Value

Units

Input Voltage

VIN

6

V

Output Voltage Range

VOUT

-0.3 to VIN

V

Power Dissipation

PD

Internally Limited (3)

 

Output Short Circuit Duration

 

Infinite

 

Thermal Resistance, Junction-to-Ambient

ΘJA

155(SOT-223)

°C/W

90(TO-252)

Lead Temperature (Soldering, 5 sec.)

 

260

°C

Junction Temperature Range

TJ

-40 to +150

°C

Storage Temperature Range

TS

-40 to +150

°C

 

Recommended Operating Conditions

Parameter

Symbol

Value

Units

Supply Input Voltage Range

VIN

5

V

Junction Temperature Range

TJ

-40 to +125

°C

 

 

 

 

 

 

 

 

Electrical Characteristics

VIN = 5V; CIN = 10μF; COUT = 10μF; IOUT = 10mA; TJ = 25°C; unless otherwise noted

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

VOUT

Output Voltage Accuracy

Vout=1.2V

Vout=1.5V

Vout=1.8V

Vout=2.5V

Vout=3.3V

1.176

1.47

1.764

2.45

3.234

1.2

1.5

1.8

2.5

3.3

1.224

1.53

1.836

2.55

3.366

V

ΔVOUT/VOUT

Line Regulation

VIN = (VOUT + 0.7)V to 5.5V

--

0.1

--

%/V

ΔVOUT/VOUT

Load Regulation (5)

VIN = (VOUT + 0.7)V

IOUT = 10mA to 1500mA

--

2

--

%

ΔVOUT/ΔT

Output Voltage Temperature Coefficient

Note 4

--

0.1

--

mV/°C

VIN – VOUT

Dropout Voltage (6)

IOUT = 150mA

--

40

--

mV

IOUT = 500mA

--

150

--

mV

IOUT = 1000mA

--

300

--

mV

TPROTECTION

Thermal Protection

Thermal Protection Temperature

--

150

--

°C

Protection Hysterisys

--

30

--

°C

IQ

Quiescent Current

IOUT = 0mA

--

150

--

μA

ILIMIT

Current Limit

 

--

2.5

--

A

Ishort

Short Circuit Current

Vin=Vout+1V; Vout< 0.4V

--

0.55

--

A

Note 1: Exceeding the absolute maximum rating may damage the device.

Note 2: The device is not guaranteed to function outside its operating rating.

Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD(MAX) = (TJ(MAX) – TA)/ΘJA. ​​ Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. ​​ See “Thermal Consideration” section for details

Note 4: Output voltage temperature coefficient is the worst case voltage change divided by the total temperature range.

Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. ​​ Parts are tested for load regulation in the load range from 0.1mA to 1200mA. ​​ Changes in output voltage due to heating effects are covered by the thermal regulation specification.

Note 6: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential.

 

 

Typical Performance Characteristics

 

Applications Information

Application Hints

Like any low dropout regulator, EC8812 requires external capacitors to ensure stability. ​​ The external capacitors must be carefully selected to ensure performance.

Input Capacitor

An input capacitor of at least 10μF is required. ​​ Ceramic or Tantalum can be used. ​​ The value can be increase without upper limit.

Output Capacitor

An output capacitor is required for stability. ​​ It must be placed no more than 1 cm away from the VOUT pin, and connected directly between VOUT and GND pins. ​​ The minimum value is 10μF but may be increase without limit.

 

Thermal Considerations

It is important that the thermal limit of the package is not exceeded. ​​ The EC8812 has built-in thermal protection. ​​ When the thermal limit is exceeded, the IC will enter protection, and VOUT will be pulled to ground. ​​ The power dissipation for a given application can be calculated as following:

 

The power dissipation (PD) is

PD = IOUT * [VIN – VOUT]

 

The thermal limit of the package is then limited to PD(MAX) = [TJ – TA]/ΘJA where TJ is the junction temperature, TA is the ambient temperature, and ΘJA is around 155°C/WSOT-223 for EC8812. ​​ The EC8812 is designed to enter thermal protection at 170°C. ​​ For example, if TA is 25°C then the maximum PD is limited to about 0.94W. ​​ In other words, if IOUT(MAX) = 1200mA, then [VIN – VOUT] cannot exceed 780mV.

 

Outline Drawing For SOT-223

 

Outline Drawing For TO252-3L

 

 

 

 


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