参数资料
型号: ADP1752-1.5-EVALZ
厂商: Analog Devices Inc
文件页数: 12/20页
文件大小: 0K
描述: BOARD EVAL AD1752 1.5V
标准包装: 1
每 IC 通道数: 1 - 单
输出电压: 1.5V
电流 - 输出: 800mA
输入电压: 1.6 ~ 3.6 V
稳压器类型: 正,固定式
工作温度: -40°C ~ 125°C
板类型: 完全填充
已供物品:
已用 IC / 零件: ADP1752-1.5
ADP1752/ADP1753
Data Sheet
1
T
EN
The EN pin active/inactive thresholds are derived from the VIN
voltage. Therefore, these thresholds vary with changing input
voltage. Figure 29 shows typical EN active/inactive thresholds
when the input voltage varies from 1.6 V to 3.6 V.
1.1
1.0
V OUT
0.9
EN ACTIVE
2
500mV/DIV
V OUT = 1.5V
C IN = C OUT = 4.7μF
0.8
EN INACTIVE
CH1 2.0V BW
CH2 500mV BW M40μs
A CH1
920mV
0.7
T 9.8%
Figure 27. V OUT Ramp-Up with Internal Soft Start
ADJUSTABLE OUTPUT VOLTAGE ( ADP1753 )
0.6
The output voltage of the ADP1753 can be set over a 0.75 V to
0.5
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.3 V range. The output voltage is set by connecting a resistive
voltage divider from VOUT to ADJ. The output voltage is calcu-
lated using the following equation:
INPUT VOLTAGE (V)
Figure 29. Typical EN Pin Thresholds vs. Input Voltage
POWER-GOOD FEATURE
V OUT = 0.5 V × (1 + R1 / R2 )
(2)
The ADP1752 / ADP1753 provide a power-good pin, PG, to
where:
R1 is the resistor from VOUT to ADJ.
R2 is the resistor from ADJ to GND.
The maximum bias current into ADJ is 150 nA. Therefore, to
achieve less than 0.5% error due to the bias current, use values
less than 60 kΩ for R2.
ENABLE FEATURE
The ADP1752 / ADP1753 use the EN pin to enable and disable
the VOUT pin under normal operating conditions. As shown in
Figure 28, when a rising voltage on EN crosses the active
threshold, VOUT turns on. When a falling voltage on EN
crosses the inactive threshold, VOUT turns off.
indicate the status of the output. This open-drain output
requires an external pull-up resistor to V IN . If the part is in
shutdown, in current limit mode, in thermal shutdown, or if it
falls below 90% of the nominal output voltage, PG immediately
transitions low. During soft start, the rising threshold of the
power-good signal is 93.5% of the nominal output voltage.
The open-drain output is held low when the ADP1752 / ADP1753
have sufficient input voltage to turn on the internal PG transistor.
An optional soft start delay can be detected. The PG transistor
is terminated via a pull-up resistor to V OUT or V IN .
Power-good accuracy is 93.5% of the nominal regulator output
voltage when this voltage is rising, with a 90% trip point when
this voltage is falling.
T
EN
Regulator input voltage brownouts or glitches trigger a power
no-good if V OUT falls below 90%.
A normal power-down triggers a power no-good when V OUT
drops below 90%.
V OUT
1 2
500mV/DIV
V OUT = 1.5V
C IN = C OUT = 4.7μF
CH1 500mV BW CH2 500mV BW M2.0ms
A CH1
1.05V
T 29.6%
Figure 28. Typical EN Pin Operation
As shown in Figure 28, the EN pin has hysteresis built in. This
hysteresis prevents on/off oscillations that can occur due to
noise on the EN pin as it passes through the threshold points.
Rev. F | Page 12 of 20
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