AAT2500 datasheet(4/26 Pages) ANALOGICTECH

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AAT2500

1MHz Step-Down Converter/LDO Regulator

2500.2006.05.1.16

Electrical Characteristics1

Symbol

Description

Conditions

Min

Typ Max

Units

LDO

VIN = VLDO = VOUT(NOM) + 1V for VOUT options greater than 1.5V. VIN = VLDO = 2.5V for VOUT ≤ 1.5V. IOUT =

1mA, COUT = 2.2µF, CIN = 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.

TA = 25°C

-1.5

1.5

VOUT

Output Voltage Tolerance

IOUT = 1mA to 300mA TA = -40°C

-2.5

2.5

to 85°C

VIN

Input Voltage

VOUT+VDO2

5.5

VDO

Dropout Voltage3, 4

IOUT = 300mA

400

600

ΔVOUT/

Line Regulation

VIN = VOUT + 1V to 5V

0.09

%/V

VOUT*ΔVIN

ΔVOUT(Line) Dynamic Line Regulation

IOUT = 300mA, VIN = VOUT + 1V to

2.5

VOUT + 2V, TR/TF = 2µS

ΔVOUT(Load)

Dynamic Load Regulation

IOUT = 1mA to 300mA, TR <5µS

IOUT

Output Current

VOUT > 1.3V

300

ISC

Short-Circuit Current

VOUT < 0.4V

600

IQLDO

LDO Quiescent Current

VIN = 5V, No Load, ENLDO = VIN

125

µA

ISHDN

Shutdown Current

VIN = 5V; ENLDO = GND,

1.0

µA

EN = SGND = PGND

1kHz

PSRR

Power Supply Rejection Ratio IOUT = 10mA, CBYP = 10nF 10kHz

1MHz

TSD

Over-Temperature Shutdown

145

°C

Threshold

THYS

Over-Temperature Shutdown

°C

Hysteresis

Output Noise

eNBW = 300Hz to 50kHz

µVRMS

Output Voltage Temperature

ppm/°C

Coefficient

1. The AAT2500 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured

by design, characterization, and correlation with statistical process controls.

2. To calculate the minimum LDO input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX), as long as VIN ≥ 2.5V.

3. For VOUT <2.1V, VDO = 2.5 - VOUT.

4. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.

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