AS3815M5-2.5 [SIPEX]

Fixed Positive LDO Regulator, 2.5V, 0.35V Dropout, BIPolar, PDSO5, SOT-23, 5 PIN;


型号：	AS3815M5-2.5
厂家：	SIPEX CORPORATION
描述：	Fixed Positive LDO Regulator, 2.5V, 0.35V Dropout, BIPolar, PDSO5, SOT-23, 5 PIN 光电二极管
文件：	总8页 (文件大小：160K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AS3815

150 mA, Low-Noise LDO Voltage Regulator

(Preliminary Information)

FEATURES

APPLICATIONS

•

Low Noise Output LDO

•

PDA

1% Initial Accuracy At 150mA

Battery Powered Systems

Cellular Phone

Very Low Quiescent Current

Low Dropout Voltage (210mV At 150mA)

Current & Thermal Limiting

Cordless Telephones

Radio Control Systems

Portable/Palm Top/Notebook Computers

Portable Consumer Equipment

Portable Instrumentation

Bar Code Scanners

Reverse-Battery Protection

Wide Range of Fix Output Voltages

1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 4.0V, 4.5V, & 5.0V

Zero Off-Mode Current

•

Small 5-Pin SOT-23

SMPS Post-Regulator

Pin Compatible to MIC5205/MAX8877 (Fixed Option Only)

PRODUCT DESCRIPTION

The AS3815 is an excellent choice for use in battery-powered applications, and where power conservation is desired. Such as:

cellular/ cordless telephones, radio control systems, and portable computers.

This device is a positive voltage regulator with very low dropout voltage and low output noise. It uses very little quiescent current of

750 µA at 100 mA output load. V_OUTtolerance is less than 1% with a compensated temperature coefficient. Many fixed output

voltages, as listed below, or an adjustable version are available in a small 5-pin SOT-23 package.

Other key features include: Zero off-mode current, protection against reversed battery, thermal and current limiting.

ORDERING INFORMATION

Part Number

Operating Junction

Accuracy

Package Type

Temperature Range

-40°C to +125°C

X = Output Voltage, X = 1.8 for 1.8V, 3.3 for 3.3V etc.

Blank for Adjustable

AS3815M5-X

SOT-23-5

PIN CONNECTIONS

For other fixed voltages consult factory.

Top View

MARKING INFORMATION

V_OUT

ADJ/BYP

BYP

Voltage

1.8

Marking

R1XX

R2XX

R3XX

R4XX

R5XX

R6XX

Voltage

3.6

Marking

R7XX

R8XX

R9XX

RAXX

RBXX

RCXX

AS3815

2.5

4.5

2.8

4.70

4.75

5.0

2.85

3.0

3.3

V_INGND EN

_INGND EN

AS3815M5-X

AS3815M5-ADJ

ADJ

Fixed Output Voltage

Adjustable Output Voltage

Rev. 10/6/00

AS3815

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

Input Voltage................................................. +2.5V to +16V

Operating Junction Temperature Range ..... -40°C to +125°C

Enable Input Voltage............................................. 0V to V_IN

SOT-23-5 (θ_JA) ..................................................... See Note 1

Thermal Shutdown .................................... Internally Limited

Lead Temp. (Soldering, 5 Seconds) ............................ 260°C

Operating Junction Temperature Range ..... -40°C to +125°C

Input Supply Voltage........................................-20V to +20V

Enable Input Voltage........................................-20V to +20V

ELECTRICAL CHARACTERISTICS

T_J= 25°C, V_IN= V_OUT+ 1V, I_L= 100µA, C_L= 1µF, and V_ENABLE> 2.4V. Unless otherwise specified boldface applies over the

junction temperature range

Parameter

Test Conditions

Typ

Min

Max

Units

Output Voltage Tolerance (V_OUT

)

-1

%V_NOM

I_L= 100 µA

I_L= 500 µA

-2

Output Voltage Temperature Coefficient

Line Regulation

0.03

ppm/°C

%/V

V_IN= V_OUT+ 1V to 16V

0.1

0.2

V_IN= V_OUT+ 1V to 16V

Load Regulation

I_L= 0.1mA to 150mA

I_L= 100 µA

0.1

0.2

0.5

Dropout Voltage (See Note 2)

(V_IN- V_O)

I_L= 50 mA

140

180

210

< 1

190

230

250

300

275

350

I_L= 100 mA

I_L= 150 mA

V_ENABLE< 0.6V

Quiescent Current (I_GND

)

µA

V_ENABLE< 0.25V

Ground Pin Current

125

150

600

800

1000

1500

1900

2500

I_L= 100 µA

I_L= 50 mA

I_L= 100 mA

I_L= 150 mA

(I_GND

)

350

750

1300

Ripple Rejection (PSRR)

Current Limit (I_LIMIT

Output Noise (e_NO

360

390

µV_RMS

)

V_OUT= 0V

500

)

I_L= 50mA, C_L= 1µF

10Hz – 100Khz.)

Input Voltage Level

Logic Low (V_IL)

OFF

0.6

Input Voltage Level

Logic High (V_IL)

V_IL< 0.6V

V_IH> 2.0V

2.0

ENABLE Input Current

0.01

µA

Note 1: The maximum allowable power dissipation is a function of maximum operating junction temperature, T_{J (max)}, the junction to ambient thermal resistance, and

the ambient, θ_JA, and the ambient temperature T_A. The maximum allowable power dissipation at any ambient temperature is given:

_{D (max)}= (T_{J (max)}- T_A)/θ_JA,exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal shutdown.

The θ_JAof the AS3815 is 220^oC/W mounted on a PC board.

Note 2: Not apply to 1.8V version.

Rev. 10/6/00

AS3815

TYPICAL APPLICATION

V_IN

V_OUT

1.0uF

GND

AS3815

BYP

(Optn)

ENABLE may be tied directly to

Rev. 10/6/00

AS3815

Application Hints

In general, linear regulator stability decreases with higher

output currents. In most applications the AS3815 is

operating at few milliamps. In these applications the output

capacitance can be further reduced. For example, when the

regulator is running at 10mA output current the output

capacitance value is half compared to the same regulator

that is running at 150mA.

The AS3815 requires an output capacitor for device stability.

The value required varies greatly depending upon the

application circuit. The high frequency characteristics of

electrolytic capacitors depend greatly on the type and also on

the manufacturer. Sometimes bench testing is the only means

to determine the proper capacitor type and value. The high

quality 2.2µF aluminum electrolytic capacitor covers all

general application circuits; this stability can be obtained with

a tantalum electrolytic value of 1µF.

With the AS3815 adjustable regulator, the minimum value

of output capacitance is a function of the output voltage.

The value decreases with higher output voltages, since the

closed loop gain is increased.

Typical Applications Circuits

The AS3815 provides access to the internal reference. A 10µF capacitor on the BYP pin will provide a significant reduction in output

noise. This pin may be left unconnected if the output noise is not a major concern. The AS3815 start-up speed is inversely

proportional to the size of this capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of

C_BYP. If the rapid turn-ON is necessary, omit bypass capacitor.

Figure 1 shows AS3815 standard application circuit. The EN pin is pulled high (>2.0V) to enable the regulator. To disable the

regulator, EN < 0.6V.

V_IN

V_OUT

GND

AS3815

BYP

(Optn)

Hi-ON

Lo-OFF

Fig. 1

Top View

The AS3815 in figure 2 shows adjustable output voltage configuration. Two resistors set the output voltage. The formula for output

voltage is:

V_OUT= 1.235 x 1+

Resistor values are not critical as the ADJ pin has high input impedance, for best results use resistors of 47kΩ or less. A capacitor

from ADJ to ground will provide improved noise performance.

V_IN

V_OUT

GND

AS3815

ADJ

Byp

Hi-ON

(Optn)

Lo-OFF

Top View

Fig. 2

Rev. 10/6/00

AS3815

PACKAGE DRAWING

SOT-23-5L (M5)

B (5 PLACES)

INCHES

MILLIMETERS

NOTE:

1. REFER TO APPLICABLE

MIN.

0.90

MAX

1.30

0.10

MIN.

MAX.

.035

.051

.004

2. CONTROLLING DIMENTION : MILLIMETER

3. PACKAGE SURFACE FINISHING TO BE SMOOTH

FINISH.

0.80 REF

.0315 REF

0.30

0.10

2.70

1.40

0.50

0.35

3.10

1.80

.012

.004

.106

.055

.019

.0137

.122

.071

.037 BSC.

0.95 BSC.

1.70

2.50

2.10

3.00

.066

.098

.082

.118

MIN 0.2

MIN .0078

Rev. 10/6/00

AS3815

Ground Current Vs. Load Current

Ground Current Vs. Input Voltage

1.40

1.20

1.00

0.80

0.60

0.40

0.20

0.00

110

100

Vo = 3.3V

IL = 100uA

CL = 1uF

3.3V Device

Vin = 4.3V

CL=1uF

100

150

Vin (V)

IL (mA)

Ground Current Vs. Load Current

(in Dropout)

Output Voltage Vs. Input Voltage

3.340

3.335

3.330

3.325

3.320

3.315

3.310

3.305

3.300

3.295

3.290

2.00

1.50

1.00

0.50

0.00

3.3V Device

IL = 100uA

CL = 1uF

3.3V Device

Vin = 4.3V

CL = 1uF

100

Vin (V)

IL (mA)

Dropout Voltage Vs. Load Current

Output Voltage Vs. Load Current

3.310

3.308

3.306

3.304

3.302

3.300

200

150

100

3.3V Device

Vin = 4.3V

CL = 1uF

Vin = 4.3V

Vo = 3.3V

CL = 1uF

100

150

IL ( mA)

Rev. 10/6/00

AS3815

Ground Current Vs. Temperature

90.0

80.0

70.0

60.0

50.0

950

850

750

650

550

450

Vin = 4.3V

Vout = 3.3V

CL = 1uF

IL = 100uA

Vin = 4.3V

Vout = 3.3V

CL= 1uF

IL = 100mA

-40

-20

100

120

-40

-20

100

120

Temperature (Degree C)

Ground Current in Dropout Vs. Temperature

Output Voltage Vs Temperature

3.400

3.380

3.360

3.340

3.320

3.300

3.280

3.260

3.240

3.220

3.200

2.30

2.20

2.10

2.00

1.90

1.80

1.70

1.60

1.50

1.40

Vin = 4.3V

Vout = 3.3V

CL = 1uF

Vin = 4.3V

Vout = 3.3V

CL = 1uF

IL = 150mA

-40

-20

100

120

-40

-20

100

120

Temperature (Degree C)

Enable Voltage, On Threshold Vs. Input Voltage

1.60

1.50

1.40

1.30

1.20

1.10

1.00

0.90

0.80

Vout = 3.3V

IL = 100uA

CL = 1uF

Vin (V)

Rev. 10/6/00

AS3815

Rev. 10/6/00

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