ADM7155ARDZ-02-R7 datasheet(4/24 Pages) AD

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ADM7155

Data Sheet

Rev. C | Page 4 of 24

Parameter

Symbol

Test Conditions/Comments

Min

Typ

Max

Unit

VREG THRESHOLDS5

Rising

VREG_UVLORISE

1.94

Falling

VREG_UVLOFALL

1.60

Hysteresis

VREG_UVLOHYS

185

PRECISION EN INPUT

2.3 V ≤ VIN ≤ 5.5 V

Logic High

ENHIGH

1.13

1.22

1.31

Logic Low

ENLOW

1.05

1.13

1.22

Logic Hysteresis

ENHYS

Leakage Current

IEN-LKG

EN = VIN or GND

0.01

μA

1 Based on an endpoint calculation using 1 mA and 600 mA loads.

2 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.

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

voltages above 2.3 V.

4 Start-up time is defined as the time between the rising edge of VEN to VOUT, VREG, or VREF being at 90% of the nominal value.

5 The output voltage is disabled until the VREG UVLO rise threshold is crossed. The VREG output is disabled until the input voltage UVLO rising threshold is crossed.

Table 3. Input and Output Capacitors, Recommended Specifications

Parameter

Symbol

Test Conditions/Comments

Min

Typ

Max

Unit

MINIMUM CAPACITANCE

Input1

CIN

TA = −40°C to +125°C

7.0

μF

Regulator1

CREG

TA = −40°C to +125°C

7.0

μF

Output1

COUT

TA = −40°C to +125°C

7.0

μF

Bypass

CBYP

TA = −40°C to +125°C

0.1

μF

Reference

CREF

TA = −40°C to +125°C

0.7

μF

CAPACITOR ESR

CREG, COUT, CIN, CREF

RESR

TA = −40°C to +125°C

0.001

0.2

CBYP

RESR

TA = −40°C to +125°C

0.001

2.0

1 The minimum input, regulator, and output capacitances must be greater than 7.0 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 any LDO.

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