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ADP121CB-2.5-EVALZ View Datasheet(PDF) - Analog Devices

Part NameADP121CB-2.5-EVALZ ADI
Analog Devices ADI
Description150 mA, Low Quiescent Current, CMOS Linear Regulator


ADP121CB-2.5-EVALZ Datasheet PDF : 20 Pages
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Data Sheet
THEORY OF OPERATION
The ADP121 is a low quiescent current, low dropout linear
regulator that operates from 2.3 V to 5.5 V and provides up
to 150 mA of output current. Drawing a low 30 μA quiescent
current (typical) at full load makes the ADP121 ideal for battery-
operated portable equipment. Shutdown current consumption
is typically 100 nA.
Optimized for use with small 1 µF ceramic capacitors,
the ADP121 provides excellent transient performance.
VIN
VOUT
R1
GND
SHORT CIRCUIT,
UVLO, AND
THERMAL
PROTECT
EN
SHUTDOWN
0.8V REFERENCE
R2
Figure 27. Internal Block Diagram
ADP121
Internally, the ADP121 consists of a reference, an error amplifier,
a feedback voltage divider, and a PMOS pass transistor. Output
current is delivered via the PMOS pass device, which is con-
trolled by the error amplifier. The error amplifier compares the
reference voltage with the feedback voltage from the output and
amplifies the difference. If the feedback voltage is lower than
the reference voltage, the gate of the PMOS device is pulled
lower, allowing more current to flow and increasing the output
voltage. If the feedback voltage is higher than the reference
voltage, the gate of the PMOS device is pulled higher, allowing
less current to flow and decreasing the output voltage.
The ADP121 is available in output voltages ranging from 1.2 V to
3.3 V. The ADP121 uses the EN pin to enable and disable the
VOUT pin under normal operating conditions. When EN is
high, VOUT turns on; when EN is low, VOUT turns off. For
automatic startup, EN can be tied to VIN.
Rev. G | Page 11 of 20
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GENERAL DESCRIPTION
The ADP121 is a quiescent current, low dropout, linear regulator that operates from 2.3 V to 5.5 V and provides up to 150 mA of output current. The low 135 mV dropout voltage at 150 mA load improves efficiency and allows operation over a wide input voltage range. The low 30 μA of quiescent current at full load makes the ADP121 ideal for battery-operated portable equipment.
The ADP121 is available in output voltages ranging from 1.2 V to 3.3 V. The parts are optimized for stable operation with small 1 μF ceramic output capacitors. The ADP121 delivers good transient performance with minimal board area.
Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP121 is available in a tiny 5-lead TSOT and 4-ball 0.4 mm pitch halide-free WLCSP packages and utilizes the smallest footprint solution to meet a variety of portable applications.

FEATURES
  Input voltage range: 2.3 V to 5.5 V
  Output voltage range: 1.2 V to 3.3 V
  Output current: 150 mA
  Low quiescent current
     IGND = 11 μA with 0 μA load
     IGND = 30 μA with 150 mA load
  Low shutdown current: <1 μA
  Low dropout voltage
     90 mV @ 150 mA load
  High PSRR
     70 dB @ 1 kHz at VOUT = 1.2 V
     70 dB @ 10 kHz at VOUT = 1.2 V
  Low noise: 40 μV rms at VOUT = 1.2 V
  No noise bypass capacitor required
  Output voltage accuracy: ±1%
  Stable with a small 1 μF ceramic output capacitor
  Current limit and thermal overload protection
  Logic controlled enable
  5-lead TSOT package
  4-ball 0.4 mm pitch WLCSP
 
APPLICATIONS
  Mobile phones
  Digital cameras and audio devices
  Portable and battery-powered equipment
  Post dc-to-dc regulation
  Post regulation

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