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参数资料
| 型号： | ADP1755-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 1.2V SET ADP1755 |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 输出电压： | 0.75 ~ 3V |
| 电流 - 输出： | 1.2A |
| 输入电压： | 1.6 ~ 3.6V |
| 稳压器类型： | 正，可调式 |
| 工作温度： | -40°C ~ 125°C |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1755 |
Data Sheet
THEORY OF OPERATION
The ADP1754/ADP1755 are low dropout linear regulators that
use an advanced, proprietary architecture to provide high power
supply rejection ratio (PSRR) and excellent line and load transient
response with only a small 4.7 μF ceramic output capacitor. Both
devices operate from a 1.6 V to 3.6 V input rail and provide up
to 1.2 A of output current. Supply current in shutdown mode is
typically 2 μA.
ADP1754/ADP1755
The ADP1754 is available in seven fixed output voltage options
between 0.75 V and 2.5 V. The ADP1754 allows for connection
of an external soft start capacitor that controls the output
voltage ramp during startup. The ADP1755 is the adjustable
version with an output voltage that can be set to a value
between 0.75 V and 3.3 V by an external voltage divider. Both
devices are controlled by an enable pin (EN).
SOFT START FUNCTION (ADP1754/ADP1755)
VIN
ADP1754
UVLO
REVERSE POLARITY
PROTECTION
VOUT
For applications that require a controlled startup, the ADP1754/
ADP1755 provide a programmable soft start function. The
programmable soft start is useful for reducing inrush current
upon startup and for providing voltage sequencing. To implement
GND
PG
SHORT-CIRCUIT
AND THERMAL
PROTECTION
0.5V
REF
R1
R2
SENSE
soft start, connect a small ceramic capacitor from SS to GND.
Upon startup, a 0.9 μA current source charges this capacitor.
The ADP1754/ADP1755 start-up output voltage is limited by
the voltage at SS, providing a smooth ramp-up to the nominal
output voltage. The soft start time is calculated as follows:
EN
PG
DETECT
SHUTDOWN
0.9μA
SS
t SS = V REF × ( C SS / I SS )
where:
t SS is the soft start period.
V REF is the 0.5 V reference voltage.
(1)
Figure 24. ADP1754 Internal Block Diagram
C SS is the soft start capacitance from SS to GND.
I SS is the current sourced from SS (0.9 μA).
VIN
ADP1755
UVLO
REVERSE POLARITY
PROTECTION
VOUT
When the ADP1754/ADP1755 is disabled (using the EN pin), the
soft start capacitor is discharged to GND through an internal 100 ?
resistor.
2.50
GND
SHORT-CIRCUIT
AND THERMAL
2.25
2.00
EN
PROTECTION
1.75
1nF
PG
PG
0.5V
REF
ADJ
1.50
1.25
4.7nF
DETECT
0.9μA
1.00
10nF
EN
SHUTDOWN
SS
0.75
0.50
Figure 25. ADP1755 Internal Block Diagram
0.25
Internally, the ADP1754/ADP1755 consist of a reference, an
0
0
2
4
6
8
10
error amplifier, a feedback voltage divider, and a PMOS pass
transistor. Output current is delivered via the PMOS pass
transistor, which is 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 pass 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 pass
and decreasing the output voltage.
Rev. F | Page 11 of 20
TIME (ms)
Figure 26. V OUT Ramp-Up with External Soft Start Capacitor
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