EC8317|600mA CMOS LDO


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600mA CMOS LDO

Converter

 

EC8317

 

 

 

Descriptions

EC8317 is a positive, linear regulator featuring a low quiescent current (35uA typ.) with low dropout voltage, making it ideal for battery powered applications. The space- saving SOT-23-5 package are attractive for "Pocket" and "Hand Held" applications. EC8317 has Over Temperature Protection (OTP), and Over Current Protection (OCP) to prevent possible device failures due to improper or worst case applications. EC8317 is stable with an output capacitor of 2.2μF or greater.

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Feature

 

​​ Very Low Dropout Voltage

 ​​ ​​ ​​ ​​​​  ​​ Guaranteed 600 mA Output

 ​​ ​​ ​​ ​​​​  ​​ Typical accuracy within 2%

 ​​ ​​ ​​ ​​​​  ​​ 35uA Quiescent Current

 ​​ ​​ ​​ ​​​​  ​​ Over Temperature Protection (OTP)

 ​​ ​​ ​​ ​​​​  ​​ Over Current Protection (OCP)

 ​​ ​​ ​​ ​​​​  ​​ Power Good Detector ​​ 

 ​​ ​​ ​​ ​​​​  ​​ Power-Saving Shutdown Mode

 ​​ ​​ ​​ ​​​​  ​​ Space-Saving SOT23-5L

 ​​ ​​ ​​ ​​​​  ​​ Adjustable Output Voltages

 ​​ ​​ ​​ ​​​​  ​​ Low Temperature Coefficient

 ​​ ​​ ​​ ​​​​  ​​ RoHS Compliant and 100% Lead (Pb)-Free

 

 

Application

 

​​ Instrumentation

​​ Portable Electronics

​​ Wireless Devices

​​ Cordless Phones

​​ PC Peripherals

​​ Battery Powered Widgets

​​ Electronic Scales

 

 

Ordering Information

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ EC8317 XXX XX X

 

RTape & Reel

Output voltage:

​​ ADJ : ADJ

B2:SOT23-5L

 

 

 

Part Number

Package

Marking

Marking Information

EC8317ADJB2R

SOT23-5L

​​ 

​​ ​​ Starting with 3, a bar on top of 3 is for

 ​​ ​​​​ production year 2011, and underlined 3 is ​​ 

 ​​ ​​​​ for year 2012. The naming pattern ​​ 

 ​​ ​​​​ continues with consecutive characters for  ​​​​ 

 ​​ ​​​​ later years.

□” is for the week code. (A-Z: 1-26, a-z:

 ​​ ​​ ​​ ​​ ​​​​ 27-52)The last character “L” is for Lead-

 ​​ ​​ ​​ ​​ ​​​​ freeprocess.

​​ A dot on top right corner is for PIN1.

 

 

 

 

 

 

Pin Configuration  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ Typical Application

 

 

 ​​​​ EC8317

 

 

 

 

 

 

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ Vout= 1.2 (R1 +R2)/R2 ; C2 is option

 

 

Absolute Maximum Ratings  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 

 

Parameter

Symbol

Value

Units

Input Voltage

VIN

7

V

Enable Voltage

VEN

-0.3 to VIN

V

Output Voltage

VOUT

-0.3 to 4.6

V

Power Dissipation

PD

Internally Limited

 

Thermal Resistance, Junction-to-Ambient

ΘJA

250 (SOT-23-5)

°C/W

Lead Temperature (Soldering, 5 sec.)

 

260

°C

Junction Temperature

TJ

-20 to +150

°C

Storage Temperature

TS

-40 to +150

°C

 

 

 

 

 

 

 

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Recommended Operating Conditions

 

Parameter

Symbol

Value

Units

​​ Supply Input Voltage Range

VIN

2.5~5.5

V

​​ Junction Temperature Range

TJ

-20 to +125

°C

 

 

Electrical Characteristic

 

TA = 25, VIN=5 V unless otherwise noted

Parameter

Symbol

Test Condition

Min

Typ

Max

Units

Input Voltage Range

VIN

 

Note

 

5.5

V

Output Voltage

VO

IO=1mA

-2

 

2

%

Dropout Voltage

VDROPOUT

IO=300mA

2.0V<VO(NOM)<=2.8V

 

400

 

mV

VO=VONOM -2.0%

2.8V<VO(NOM)<3.8V

 

300

 

Output Current

IO

VO>1.2V

​​ ​​ 

300

600

mA

Current Limit

ILIM

VO>1.2V

 

​​ 

600

mA

Quiescent Current

IQ

IO=0mA

 

35

50

uA

Line Regulation

REGlINE

IO=5mA ; VIN=VO+1 to 5.5V

 

0.1

 

%/V

Load Regulation

REGLOAD

IO=1mA to 300mA

 

0.2

​​ 

%

Over Temerature

Shutdown

OTS

 

 

150

 

Over Temerature Hysterisis

OTH

 

 

30

 

VO Temperature Coefficient

TC

 

 

30

 

ppm/

Power Supply Rejection

PSRR

IO=50mA

f=100Hz

 

70

 

dB

f=1kHz

 

53

 

Output Voltage Noise

eN

f=10Hz to 100kHz

Co=2.2uF

 

30

 

uVrms

ADJ Input Bias Current

IADJ

 

 

30

 

nA

ADJ Reference Voltage

VREF

 

-2%

1.21

+2%

V

EN Input Threshold

VEH

VIN=2.7V to 6V

2.0

 

Vin

V

VEL

VIN=2.7V to 6V

0

 

0.4

V

EN Input Bias Current

IEN

VEN=VIN, VIN=2.7V to 6V

 

 

0.1

mA

Shutdown Supply Current

ISD

VIN=5V, VO=0V, VEN<VEL

 

0.5

1

uA

Shutdown Output Voltage

VO,SD

IO=35mA,VEN<VEL

0

 

0.1

V

Note1:Vin(min)=Vout+Vdropout

 

 

 

 

 

 

 

 

 

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Block Diagram

 

 

 

 

 

 

 

 

 

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Detailed Description

 

EC8317 is a CMOS regulator containing a PMOS pass transistor, voltage reference, error amplifier, over-current protection, thermal shutdown, and Power Good detection circuitry.

 

The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal pro- tection circuits. During normal operation, the error amplifier compares the output voltage to an internal precision ​​ voltage ​​ reference. ​​ Over ​​ Temperature Protection (OTP) and Over Current Protection (OCP) circuits become active when the junction temperature exceeds 150℃, or the current exceeds 600mA, respectively. During OTP, the output voltage remains

low. Normal operation is restored when the junction temperature drops below 120℃.

 

 

External Capacitors

 

EC8317 is stable with an output capacitor to ground of 1.0µF or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are com- paratively expensive. One option is to parallel a 0.1µF ceramic capacitor with a 10µF Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low over all cost.

 

A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection..

 

 

 

Enable

 

The EN Pin is an enable control Pin, When The Enable pin pulled High, IC is enabled; when pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1µA. This pin

behaves much like an electronic switch.

 

 

Outline ​​ Drawing ​​ SOT-23-5L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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