参数资料
| 型号： | NCV8570BMN180R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V .2A 6DFN |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 200mA |
| 电流 - 限制（最小）： | 200mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-VDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN（2x2.2） |
| 包装： | 标准包装 |
| 其它名称： | NCV8570BMN180R2GOSDKR |
NCV8570B
APPLICATIONS INFORMATION
t ON [s] + C noise [F] @
? 9 @
t ON + 100 @ 10
+ 4.41 ms
General
The NCV8570B is a high performance 200 mA low
dropout linear regulator. This device delivers excellent noise
and dynamic performance consuming only 75 m A (typ)
quiescent current at full load, with the PSRR of (typ) 82 dB
at 1 kHz. Excellent load transient performance and small
package size makes the device ideal for portable
applications.
Logic EN input provides ON/OFF control of the output
voltage. When the EN is low the device consumes as low as
typically 0.1 m A.
Access to the major contributor of noise within the
integrated circuit – Bandgap Reference is provided through
the BYP pin. This allows bypassing the source of noise by
the noise reduction capacitor and reaching noise levels
below 10 m V RMS .
The device is fully protected in case of output short circuit
condition and overheating assuring a very robust design.
Input Capacitor Requirements (C IN )
It is recommended to connect a 1 m F ceramic capacitor
between IN pin and GND pin of the device. This capacitor
will provide a low impedance path for unwanted AC signals
or noise present on the input voltage. The input capacitor
will also limit the influence of input trace inductances and
Power Supply resistance during sudden load current
changes. Higher capacitances will improve the line transient
response.
Output Capacitor Requirements (C OUT )
The NCV8570B has been designed to work with low ESR
ceramic capacitors on the output. The device will also work
with other types of capacitors until the minimum value of
capacitance is assured and the capacitor ESR is within the
specified range. Generally it is recommended to use 1 m F or
larger X5R or X7R ceramic capacitor on the output pin.
Noise Bypass Capacitor Requirements (C noise )
The C noise capacitor is connected directly to the high
impedance node. Any loading on this pin like the connection
of oscilloscope probe, or the C noise capacitor leakage will
cause a voltage drop in regulated output voltage. The
minimum recommended value of noise bypass capacitor is
10 nF. Values below 10 nF should be avoided due to possible
Turn ? On overshoot. Particular value should be chosen
based on the output noise requirements (Figure 22). Larger
values of C noise will improve the output noise and PSRR but
will increase the regulator Turn ? On time.
Enable Operation
The enable function is controlled by the logic pin EN. The
voltage threshold of this pin is set between 0.4 V and 1.2 V.
Voltage lower than 0.4 V guarantees the device is off.
Voltage higher than 1.2 V guarantees the device is on. The
NCV8570B enters a sleep mode when in the off state
drawing less than typically 0.1 m A of quiescent current. The
internal 5 M W pull ? down resistor (R PD ) assures that the
device is turned off when EN pin is not connected.
The device can be used as a simple regulator without use
of the chip enable feature by tying the EN to the IN pin.
Active Discharge
Active discharge circuitry has been implemented to insure
a fast V OUT turn off time. When EN goes low, the active
discharge transistor turns on creating a path to discharge the
output capacitor C OUT through 1 k W (R DIS ) resistor.
Turn ? On Time
The Turn ? On time of the regulator is defined as the time
needed to reach the output voltage which is 98% V OUT after
assertion of the EN pin. This time is determined by the noise
bypass capacitance C noise and nominal output voltage level
V OUT according the following formula:
V OUT [V]
(eq. 1)
68 @ 10 ? 6 [A]
Example:
Using C noise = 100 nF, V OUT = 3 V, C OUT = 1 m F,
3
68 @ 10 ? 6
The Turn ? On time is independent of the load current and
output capacitor C OUT . To avoid output voltage overshoot
during Turn ? On please select C noise ? 10 nF.
Current Limit
Output Current is internally limited within the IC to a
typical 310 mA. The NCV8570B will source this amount of
current measured with a voltage 100 mV lower than the
typical operating output voltage. If the Output Voltage is
directly shorted to ground (V OUT = 0 V), the short circuit
protection will limit the output current to 320 mA (typ). The
current limit and short circuit protection will work properly
up to V IN = 5.5 V at T A = 25 ? C. There is no limitation for the
short circuit duration.
Thermal Shutdown
When the die temperature exceeds the Thermal Shutdown
threshold (T SDU ? 150 ? C typical), Thermal Shutdown event
is detected and the output (V OUT ) is turned off.
The IC will remain in this state until the die temperature
decreases below the Thermal Shutdown Reset threshold
(T SDU ? 135 ? C typical). Once the IC temperature falls below
the 135 ? C the LDO is turned ? on again.
The thermal shutdown feature provides the protection
from a catastrophic device failure due to accidental
overheating. This protection is not intended to be used as a
substitute for proper heat sinking.
Reverse Current
The PMOS pass transistor has an inherent body diode
which will conduct the current in case that the V OUT > V IN .
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| NCV8570BMN250R2G | 功能描述:低压差稳压器 - LDO 200MA ULN RF LDO REG2.5V RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8570BMN280R2G | 功能描述:低压差稳压器 - LDO 200MA ULN RF LDO REG2.8V RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8570BMN300R2G | 功能描述:低压差稳压器 - LDO 200MA ULN RF LDO REG 3V RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8570BMN330R2G | 功能描述:低压差稳压器 - LDO 200MA ULN RF LDO REG3.3V RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8570BSN18T1G | 功能描述:低压差稳压器 - LDO 200MA ULN RF LDO REG1.8V RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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