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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
First Prev 11 12 13 14 15 16 17 18 19 20
ADP122/ADP123
140
120
100
80
60
ILOAD = 1mA
ILOAD = 150mA
ILOAD = 10mA
ILOAD = 250mA
ILOAD = 50mA
ILOAD = 300mA
40
ILOAD = 100mA TJ MAX
20
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
VIN – VOUT (V)
Figure 40. Junction Temperature vs. Power Dissipation,
Board Temperature = 85°C
PRINTED CIRCUIT BOARD LAYOUT
CONSIDERATIONS
Heat dissipation from the package can be improved by increasing
the amount of copper attached to the pins of the ADP122/ADP123.
However, as shown in Table 6, a point of diminishing returns
eventually is reached, beyond which an increase in the copper
size does not yield significant heat dissipation benefits.
The input capacitor should be placed as close as possible to the
VIN and GND pins, and the output capacitor should be placed
as close as possible to the VOUT and GND pins. Use of 0402 or
0603 size capacitors and resistors achieves the smallest possible
footprint solution on boards where the area is limited.
Rev. 0 | Page 16 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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