ADP170 datasheet(4/20 Pages) AD

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ADP170/ADP171

Rev. B | Page 4 of 20

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

OUTPUT NOISE

OUTNOISE

10 Hz to 100 kHz, VIN = 3.6 V, VOUT = 3.0 V

μV rms

10 Hz to 100 kHz, VIN = 3.6 V, VOUT = 1.8 V

μV rms

10 Hz to 100 kHz, VIN = 3.6 V, VOUT = 1.2 V

μV rms

10 Hz to 100 kHz, VIN = 3.6 V, VOUT = 0.8 V

μV rms

POWER SUPPLY REJECTION RATIO

PSRR

1 kHz, VIN = 3.6 V, IOUT = 10 mA, VOUT = 0.8 V

10 kHz, VIN = 3.6 V, IOUT = 10 mA, VOUT = 0.8 V

10 kHz, VIN = (VOUT + 1 V), IOUT = 10 mA to 300 mA

100 kHz, VIN = (VOUT + 1 V), IOUT = 10 mA to 300 mA

1 The current from the external resistor divider network in the case of adjustable voltage output (as with the ADP171) should be subtracted from the ground current measured.

2 Accuracy when VOUT is connected directly to ADJ. When the VOUT voltage is set by external feedback resistors, the absolute accuracy in adjust mode depends on the

tolerances of resistors used.

3 Based on an end-point calculation using 1 mA and 300 mA loads. See

for typical load regulation performance for loads less than 1 mA.

Figure 6

4 Applies only for output voltages above 1.6 V. Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal

output voltage.

5 Start-up time is defined as the time between the rising edge of EN and VOUT being at 90% of its nominal value.

6 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

TJ = −40°C to +125°C

0.45

μF

CAPACITOR ESR

RESR

TJ = −40°C to +125°C

0.001

1 The minimum input and output capacitance should be greater than 0.45 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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