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ADP122AUJZ-3.3-R7 View Datasheet(PDF) - Analog Devices

Part NameADP122AUJZ-3.3-R7 ADI
Analog Devices ADI
Description5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator
ADP122AUJZ-3.3-R7 Datasheet PDF : 20 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
ADP122/ADP123
Parameter
OUTPUT NOISE
POWER SUPPLY REJECTION RATIO
(VIN = VOUT + 0.5 V)
Symbol
OUTNOISE
PSRR
Test Conditions
10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 1.2 V
10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 1.8 V
10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 2.5 V
10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 3.3 V
10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 4.2 V
10 kHz, VOUT = 3.3 V
10 kHz, VOUT = 2.5 V
10 kHz, VOUT = 1.8 V
100 kHz, VOUT = 3.3 V
100 kHz, VOUT = 2.5 V
100 kHz, VOUT = 1.8 V
Min Typ Max Unit
25
μV rms
35
μV rms
45
μV rms
55
μV rms
65
60
dB
60
dB
60
dB
60
dB
60
dB
60
dB
1 The current from the external resistor divider network in the case of adjustable voltage output (as with the ADP123) should be subtracted from the ground current measured.
2 Accuracy when VOUT is connected directly to ADJ. When VOUT voltage is set by external feedback resistors, absolute accuracy in adjust mode depends on the tolerances of
the resistors used.
3 Based on an endpoint calculation using 1 mA and 300 mA loads.
4 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
greater than 2.3 V.
5 Start-up time is defined as the time between the rising edge of EN to 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 3.3 V
output voltage is defined as the current that causes the output voltage to drop to 90% of 3.3V, or 2.97 V.
RECOMMENDED SPECIFICATIONS
Table 2.
Parameter
Minimum Input and Output
Capacitance1
Capacitor ESR
Symbol
CAPMIN
RESR
Test Conditions
TA = −40°C to +125°C
TA = −40°C to +125°C
Min Typ
0.70
0.001
Max Unit
μF
1
Ω
1 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 any LDO.
Rev. 0 | Page 4 of 20
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GENERAL DESCRIPTION
The ADP122/ADP123 are low quiescent current, low dropout linear regulators. They are designed to operate from an input voltage between 2.3 V and 5.5 V and to provide up to 300 mA of output current. The low 85 mV dropout voltage at a 300 mA load improves efficiency and allows operation over a wide input voltage range.
The low 170 μA of quiescent current at full load makes the ADP122 ideal for battery-operated portable equipment.

FEATURES
Input voltage supply range: 2.3 V to 5.5 V
300 mA maximum output current
Fixed and adjustable output voltage versions
Very low dropout voltage: 85 mV at 300 mA load
Low quiescent current: 45 μA at no load
Low shutdown current: <1 μA
Initial accuracy: ±1% accuracy
Up to 31 fixed-output voltage options available from 1.75 V to 3.3 V
Adjustable-output voltage range 0.8 V to 5.0 V (ADP123)
Excellent PSRR performance: 60 dB at 100 kHz
Excellent load/line transient response
Optimized for small 1.0 μF ceramic capacitors
Current limit and thermal overload protection
Logic controlled enable
Compact, 5-lead TSOT package

APPLICATIONS
Digital camera and audio devices
Portable and battery-powered equipment
Automatic meter reading (AMR) meters
GPS and location management units
Medical instrumentation
Point-of-sale equipment

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