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参数资料
| 型号： | ADP225CP-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP225 |
| 标准包装： | 1 |
| 系列： | * |
Data Sheet
THEORY OF OPERATION
The ADP222 / ADP223 / ADP224 / ADP225 are low quiescent
current, fixed and adjustable dual output, low dropout linear
regulators that operate from 2.5 V to 5.5 V and provide up to
300 mA of current from each output. Drawing a low 300 μA
equipment. Shutdown current consumption is typically 200 nA.
Optimized for use with small 1 μF ceramic capacitors, the
ADP222/ADP223/ADP224/ADP225
controlled 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.
transient performance.
ADJ1
ADP223/ADP225
VIN
140 ?
THERMAL CURRENT
VOUT1
V IN = 4.2V
+ C1
1μF
ON
OFF
ON
OFF
1 EN1
2 EN2
ADJ1 8
ADP223/
ADP225
VOUT1 7
R2
R1
VOUT2 = 2.0V
+ C2
1μF
SHUTDOWN
LIMIT
3 GND
VIN 6
+ C3
EN1
CONTROL
LOGIC
AND
REFERENCE
ADP225 ONLY
4 ADJ2
VOUT2 5
VOUT1 = 2.8V
R3
1μF
R4
EN2
ENABLE
Figure 64. Typical Application Circuit for Setting Output Voltages,
GND
CURRENT
LIMIT
140 ?
ADP224 except that the output voltage dividers are internally
ADJ2
SENSE1
VOUT2
disconnected and the feedback input of the error amplifiers is
brought out for each output. The output voltages can be set
according to the following equations:
V OUT1 = 0.50 V(1 + R1 / R2 )
V OUT2 = 0.50 V(1 + R3 / R4 )
VIN
ADP222/ADP224
VOUT1
The value of R1 and R3 should be less than 200 kΩ to minimize
errors in the output voltage caused by the ADJx pin input current.
THERMAL
SHUTDOWN
CURRENT
LIMIT
140 ?
For example, when R1 and R2 each equal 200 kΩ, the output
voltage is 1.0 V. The output voltage error introduced by the ADJx
pin input current is 2 mV or 0.20%, assuming a typical ADJx pin
input current of 10 nA at 25°C.
EN1
EN2
CONTROL
LOGIC
AND
ENABLE
REFERENCE
ADP224
ONLY
The output voltage of the ADP223 / ADP225 may be set from
0.5 V to 5.0 V.
The ADP222 / ADP224 are available in multiple output voltage
options ranging from 0.8 V to 3.3 V.
GND
CURRENT
LIMIT
140 ?
VOUT2
with the addition of a quick output discharge (QOD) feature.
This allows the output voltage to start up from a known state.
The ADP222 / ADP223 / ADP224 / ADP225 use the EN1/EN2 pins
SENSE2
Internally, the ADP222 / ADP223 / ADP224 / ADP225 consist of a
reference, two error amplifiers, and two PMOS pass transistors.
to enable and disable the VOUT1/VOUT2 pins under normal
operating conditions. When EN1/EN2 are high, VOUT1/VOUT2
turn on; when EN1/EN2 are low, VOUT1/VOUT2 turn off. For
automatic startup, EN1/EN2 can be tied to VIN.
Output current is delivered via the PMOS pass device, which is
Rev. D | Page 17 of 24
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