ADP221ACBZ2828-R7 datasheet(4/20 Pages) AD

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ADP220/ADP221

Data Sheet

Rev. H | Page 4 of 20

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

POWER SUPPLY REJECTION RATIO

PSRR

VIN = 2.5 V, VOUT = 0.8 V, IOUT = 100 mA

100 Hz

1 kHz

10 kHz

100 kHz

1 MHz

VIN = 3.8 V, VOUT = 2.8 V, IOUT = 100 mA

100 Hz

1 kHz

10 kHz

100 kHz

1 MHz

Based on an end-point calculation using 1 mA and 200 mA loads.

Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only for output

voltages above 2.5 V.

Start-up time is defined as the time between the rising edge of ENx to VOUTx being at 90% of its nominal value.

Current-limit threshold is defined as the current at which the output voltage drops to 90% of the specified typical value. For example, the current limit for a 3.0 V

output voltage is defined as the current that causes the output voltage to drop to 90% of 3.0 V, or 2.7 V.

INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS

Table 2.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

MINIMUM INPUT AND OUTPUT CAPACITANCE1

CMIN

TA = −40°C to +125°C

0.70

µF

CAPACITOR ESR

RESR

TA = −40°C to +125°C

0.001

The minimum input and output capacitance should be greater than 0.70 µF over the full range of operating conditions. The full range of operating conditions in the

application must be considered during device selection to ensure that the minimum capacitance specification is met. X7R and X5R type capacitors are recommended;

Y5V and Z5U capacitors are not recommended for use with LDOs.

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