AMS3121 datasheet(3/9 Pages) AMS

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AMS3121

2A Fast Transient Linear Regulator

02/11/2010

www.advanced-monolithic.com

Phone (925) 443-0722

Fax (925) 443-0723

Absolute Maximum Ratings

(1)

Maximum Input Supply Voltage (VIN)………....…...… -0.3V to 15V

Storage Temperature Range……………................ -65⁰C to 150⁰C

Lead Temperature…………………..………….……….…..… 260⁰C

Junction Temperature………...…………………..……..……..125⁰C

Recommended Operating Conditions

(2)

Input Voltage………………………….………….……….. 1.5V to 7V

Ambient Operating Temperature…….….………… -40⁰C to 125⁰C

Thermal Information

TO-220 3-pin θJA .. …………...…………….………….…...50⁰C/W

TO-263 3-pin θJA

(3) ………………………….………………30⁰C/W

Electrical Characteristics

Unless otherwise noted: VIN=3.3V; VOUT=1.8V; CIN=10 µF; COUT=22µF; -40⁰C≤TA=TJ≤85⁰C; TJ(Max.)= 125°C; Typical values are TA= 25°C

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Output Voltage Accuracy

VOUT

-3

Maximum Output Current

IOUT_Max

Load Regulation

IOUT= 0 – 2A

0.1

Line Regulation

VIN=3.0 – 7.0V; IOUT=100mA

0.2

Supply Current

ISUP

VIN=3.3V, Io=0A

0.2

0.5

Current Limit

ILIM

2.5

Dropout Voltage

VDO

IOUT=0.1A; VOUT=95% of VOUT(NOM)

IOUT=0.5A; VOUT=95% of VOUT(NOM)

180

IOUT=1A; VOUT=95% of VOUT(NOM)

275

IOUT=2A; VOUT=95% of VOUT(NOM)

550

PSRR

ΔVOUT/ΔVIN

F=10KHz Io=20mA

Output Noise Voltage

BW= 100Hz –100 KHz

COUT = 10µF

IOUT = 500mA

125

µV(rms)

Thermal Shutdown

TSD

145

°C

Thermal Shutdown Hysteresis

TSD_HYS

°C

Notes:

Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device.

Measured on approximately 1” square of 1 oz. copper.

With package soldering to 0.5in

2 copper area over backside ground plane or internal power plane θJA can vary from 20°C/W to >40°C/W depending on

mounting technique

. The thermal resistance Junction to Case is 45⁰C/W. Total power dissipation for the switching regulator and the LDO should be taken

in consideration when calculating the output current capability of each regulator

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