EC49315|500mA Low Noise, High PSRR, Fast Transient LDO Regulator


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500mA Low Noise, High PSRR, Fast Transient LDO Regulator

EC49315

 

 

 

General Description

The ​​ EC49315 ​​ is ​​ a ​​ low ​​ noise ​​ 500mA ​​ fixed ​​ /adjustable output voltage, with high ripple rejection ratio ​​ and fast

transient response. It includes ​​ a precise reference voltage, an error amplifier, driver transistors, a compensation ​​ 

network and a low ON-resistance power MOSFET. It also integrates many protection ​​ circuitries, such as current

limiters and an over temperature protection module. The EC49315 works well with low ESR ceramic capacitors,

suitable ​​ for ​​ battery-powered ​​ applications with ​​ stringent ​​ space ​​ requirements ​​ and ​​ demanding performance. It

also offers low quiescent current.

 

Features

Wide 2.5V to 6V Operating Range

Current Limiting Protection

Thermal Shutdown Protection

Low Dropout : 225mV @ 300mA; VOUT = 3.3V

High Ripple Rejection [email protected]

Standby Current Less Than 0.1μA

 

Applications

Battery-Powered Equipment

Portable Instruments

Digital Camera

WLAN Communication

Hand-Held Instruments

 

Ordering/Marking Information

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ EC49315 ​​ XX ​​ XX X

R:Tape & reel

1.05V=05

1.1V=11

3.3V=33

ADJ=AJ

B2:SOT23-5L

F9uDFN 1×1

T2:TSOT23-5L

 

 

Part No

Package

Marking

Information

EC49315XXB2R

SOT23-5L

XXYW

XXVoltage Code

1.05V=051.1V=113.3V=33

Y2017=72018=82019=9

W A~Z=1~26 weeks

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ a~z=27~52 weeks

XXYW

XXVoltage Code

1.05V=051.1V=113.3V=33

Y2017=H2018=I

WA~Z=1~26 weeks

 ​​ ​​ ​​ ​​ ​​ ​​​​ a~z=27~52 weeks

EC49315XXF9R

Udfn1x1 4L

VV

YW

Y2017=H2018=I

WA~Z=1~26 weeks

 ​​ ​​ ​​ ​​ ​​ ​​​​ a~z=27~52 weeks

EC49315XXT2R

TSOT23-5L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

​​ 

 

Pin Configurations

 

 

 

 

 

 

 

TSOT23-5L

 

 

Pin Description

 

Name

Description

EN

Chip Enable (Active High). Note that this pin is high impedance.

There should be a pull low 100k resistor connected to GND

when the control signal is floating.

GND

Ground

VOUT

Output Voltage

VIN

Input Voltage

ADJ

Feedback  pin  voltage  is  set  to  be  0.8V,  Output  voltage  can  be

programmed by a resistor divider.

NC

No Internal Connection (Floating or Connecting to GND).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Typical Application Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Absolute Maximum Ratings (Note 1)

Supply Voltage VIN  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 8V

Power Dissipation, PD @ TA=25°C

 ​​ ​​ ​​ ​​​​ SOT23-5  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 400mW

 ​​ ​​ ​​ ​​​​ uDFN-4L  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ ​​ 400mW

Thermal Resistance, JA

 ​​ ​​ ​​ ​​​​ SOT23-5  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 250°C/W

 ​​ ​​ ​​ ​​​​ uDFN-4L  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 250°C/W

Lead Temperature  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​​​ 260°C

Storage Temperature  ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ -65°C to 150°C

ESD Susceptibility

 ​​ ​​ ​​ ​​​​ HBM (Human Body Mode)  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​​​ 2kV

 ​​ ​​ ​​ ​​​​ MM (Machine Mode)  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​​​ 200V

 

 

 

 

 

 

 

Recommended Operating Conditions

Input Voltage VIN  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 2.5V to 6V

EN Input Voltage  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 0V to 6V

Junction Temperature  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​ ​​ ​​​​ -40°C to 125°C

Ambient Operating Temperature  ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ -40°C to 85°C

 

Electrical Characteristics (Unless otherwise specified. VIN=5V TA = 25°C)

 

Parameters

Symbol

Condition

Min

Typ

Max

Units

Operating Voltage Range

VIN

 

2.5

 

6.0

V

Shutdown Supply Current

ISBY

VEN = GND, Shutdown

 

0.1

1

μA

Supply Current Limit

ILIMIT

RLOAD = 1Ω

 

900

 

mA

Quiescent Current

IQ

VADJ = 1V

 

35

 

μA

Dropout Voltage

VDrop

VOUT=3.3V

IOUT 300mA

 

225

 

mV

IOUT 500mA

 

370

 

mV

Line regulation

ΔVLINE

VIN = (VOUT +1V) to 6V,

IOUT = 1mA

 

0.075

 

%/V

Load Regulation

ΔVLOAD

(Vin=Vout+1V)1mA < IOUT

< 500mA

 

10

 

mV

Fixed Output Voltage Accuracy

ΔVOUT

IOUT =1mA

-2

 

+2

%

Feedback Voltage

VADJ

 

0.775

0.8

0.825

V

EN Threshold

Logic-Low V

VIL

VIN 2.5V to 6V, Shutdown

 

 

0.5

V

Logic-High V

VIH

VIN = 2.5V to 6V, Start-Up

1.5

 

 

 

Power Supply

Rejection Rate

f = 10Hz

PSRR

COUT = 2.2F, IOUT = 10mA

 

65

 

dB

Thermal Shutdown Temperature

TSD

 

 

150

 

°C

Thermal Shutdown Temperature

Hysteresis

ΔTSD

 

 

30

 

°C

 

Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device.

These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability.

Note 2: VIN(MIN) = VOUT+VDROP

Note 3: The dropout voltage is defined as (VIN-VOUT) when VOUT is 100mV below the target value of VOUT.

Note 4: The maximum output current is defined as (VIN-VOUT) x IOUT < Power dissipation value.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Function Block Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Application Information

Input Capacitor

An ​​ input capacitance of 1μF is required between the device input pin and ground directly (the amount of the

capacitance may be increased without limit). The input capacitor ​​ MUST  ​​​​ be ​​ located ​​ less ​​ than ​​ 1cm ​​ from ​​ the

device to assure input stability.  ​​​​ A lower ESR capacitor allows ​​ the ​​ use ​​ of ​​ less ​​ capacitance, ​​ while ​​ higher ​​ ESR

type (like aluminum ​​ electrolytic) requires more capacitance. Capacitor ​​ types ​​ (aluminum, ​​ ceramic ​​ and tantalum)

can be mixed in parallel, but the total equivalent input capacitance/ESR must be defined as above for stable

operation. There are no requirements for ​​ the ESR on the input capacitor, but ​​ tolerance and temperature

coefficient must be considered when selecting ​​ the capacitor to ensure the capacitance is 1μF over the entire

operating range.

 

Output Capacitor

The EC49315 is designed specifically to work with very small ceramic output capacitors. The minimum capacitance

recommended(temperature characteristics of ​​ X7R, ​​ X5R, ​​ Z5U ​​ or ​​ Y5V) ​​ is ​​ within ​​ the ​​ 1μF ​​ to ​​ 10mf range with

5mΩ to 50mΩ ESR range ceramic capacitor between ​​ LDO ​​ output ​​ and ​​ GND ​​ for ​​ transient ​​ stability, but it may be

increased without limit. ​​ Higher capacitance values help to improve transient response. The output ​​ capacitor's

ESR ​​ is ​​ critical ​​ because ​​ it ​​ forms a zero to provide phase lead which is required for loop stability.

 

Enable Function

The EC49315 is shut down by pulling the EN pin low, and turned ​​ on ​​ by ​​ driving ​​ the ​​ input ​​ high. ​​ If ​​ the ​​ shutdown

feature ​​ is ​​ not ​​ required, ​​ the EN pin should ​​ be tied ​​ to VIN to keep ​​ the ​​ regulator ​​ on ​​ at ​​ all ​​ times ​​ (the ​​ EN ​​ pin MUST NOT be left floating). To assure proper operation, the signal source used to drive the EN pin must be able to

swing  above  and below the specified turn-on/off voltage thresholds listed in the “Electrical Characteristics” under VIH 

and VIL. The ON/OFF signal may come from either CMOS output, or an open-collector output with pull up resistor to the

device  input voltage or another logic supply. The high-level voltage may exceed the device  input  voltage, but must remain

within the absolute maximum ratings for the EN pin.

 

Thermal Considerations

For continuous operation, do not exceed the maximum operation ​​ junction ​​ temperature ​​ 125C. The maximum

power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow

and ​​ temperature ​​ difference ​​ between ​​ junctions to ​​ ambient. ​​ The maximum power dissipation can be calculated

by following formula:

 

 

 

 

Where TJ(MAX) is the maximum operation junction temperature 125C, TA is the ambient temperature and

theθJA is ​​ the ​​ junction ​​ to ​​ ambient ​​ thermal ​​ resistance. For recommended operating conditions specification of

EC49315 ​​ where TJ(MAX) is the maximum ​​ junction temperature of the die (125C) and TA is the maximum

ambient ​​ temperature. ​​ The ​​ junction ​​ to ​​ ambient ​​ thermal resistance θJA is layout dependent.

 

Adjustable Operation

The ​​ adjustable ​​ version ​​ of ​​ the ​​ EC49315 ​​ has ​​ an ​​ output voltage ranging from ​​ 0.9V to 5V. The output voltage of

the ​​ EC49315 ​​ adjustable ​​ regulator ​​ is ​​ programmed ​​ using an ​​ external ​​ resistor ​​ divider ​​ as ​​ shown ​​ in ​​ Figure2.

R2 resistor ​​ must ​​ less ​​ than ​​ 100KΩ ​​ for ​​ good ​​ stability. ​​ To enable ​​ default ​​ output ​​ voltage ​​ (pre-set), ​​ connect

ADJ pin to ground. There is no external component needed to decide voltage.

 

Package Information

SOT23-5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SYMBOLS

DIMENSIONS IN MILLIMETERS

DIMENSIONS IN INCH

MIN

NOM

MAX

MIN

NOM

MAX

A

1.00

1.10

1.30

0.039

0.043

0.051

A1

0.00

---

0.10

0.000

---

0.004

A2

0.70

0.80

0.90

0.027

0.031

0.035

b

0.35

0.40

0.50

0.013

0.016

0.020

C

0.10

0.15

0.25

0.004

0.006

0.001

D

2.70

2.90

3.10

0.106

0.114

0.122

E

1.50

1.60

1.80

0.059

0.063

0.071

e

---

1.90(TYP)

---

---

0.075

---

H

2.60

2.80

3.00

0.102

0.110

0.118

L

0.370

---

---

0.015

---

---

Θ1

e1

---

0.95(TYP)

---

---

0.037

---

 

 

 

 

 

 

uDFN(1x1) TypeA

 

 

 

 

 

 

 

 

 

 

​​ 

 

 

 

 

 

 

 

 

 

 

 

 

 

uDFN(1x1) TypeB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TSOT23-5L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SYMBOLS

DIMENSIONS IN MILLIMETERS

MIN

NOM

MAX

A

0.75

--------------

0.90

A1

0.00

--------------

0.10

A2

0.70

0.75

0.80

B

0.30

--------------

0.50

c

0.08

--------------

0.20

D

2.80

2.90

3.00

E

2.60

2.80

3.00

E1

1.50

1.60

1.70

e

 

0.95 BSC

 

e1

 

1.90 BSC

 

L

0.30

0.45

0.60

L1

 

0.60 REF

 

L2

 

0.25 BSC

 

R

0.10

--------------

---------------

R1

0.10

--------------

0.25

θ

θ1

10°

12°

y

----------------

---------------

0.10

NOTE :

​​ 1.  ​​​​ All dimensions are in millimeters.

2.  ​​​​ Dimension D does not include mold flash, protrusion or gate burrs. Mold flash protrusions or gate burrs shall not exceed 0.15mm per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15mm per side.

3.  ​​​​ The package top may be smaller then the package bottom. Dimensions D and E1 are determined at outermost extremes of the plastic body exclusive of mold flash, Tie bar burrs, Gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body.

4.  ​​​​ Dimension “b” does not include dambar protrusion. Allowable dambar protrusion shall be 0.08mm total in excess of the “b” dimension at maximum material condition. The dambar cannot be located on the lower radius of the foot. Minimum space between protrusion and an adjacent lead shall not be less than 0.07mm

 

 

 

 

 

Footprints

SOT23-5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

uDFN(1x1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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