参数资料
| 型号： | NCP5252MNTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 16QFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 4.5 V ~ 13.2 V |
| 频率 - 开关： | 333kHz ~ 1MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-QFN（3x3） |
| 其它名称： | NCP5252MNTXGOSDKR |
NCP5252
before re ? starting. A discharge resistor is turned on to
discharge V o before re ? starting.
Overvoltage Protection (OVP)
When the SMPS output voltage is above 115% (typ) of the
preset nominal regulation voltage for over 1.5 m s, an OV
fault is set. The high ? side MOSFET will turn off and the
low ? side MOSFET will be turned on to discharge the output
until V o drops below the default threshold (105%). Once the
output voltage is below the overvoltage window, the device
will recover to normal operation.
Undervoltage Protection (UVP)
A UVP circuit monitors the output voltage to detect an
undervoltage event. The undervoltage limit is 80% (typ) of
the nominal output voltage level. If the output voltage is
below this threshold for over 4 switching cycles, a UVP fault
is set. The high ? side and low ? side MOSFETs are turned off
and a discharge resistor is turned on to discharge the output
voltage for 3 soft ? start periods. Once the 3 soft ? start periods
have ended, the regulator will go through a normal soft ? start
cycle.
LDO Regulator
The internal LDO regulator (V5) can provide up to 20 mA
(typ) for internal analog circuitry. Connect a capacitor to pin
V5 for proper regulation.
Undervoltage Logout
The UVLO circuit will activate when the V CC voltage is
below 3.5 V (typ). At that time both MOSFETs will turn off.
When the V CC voltage is higher than 4.0 V, the UVLO flag
will be cleared and the soft ? start function will activate.
Thermal Shutdown
The IC will shutdown if the die temperature exceeds
150 ° C. The IC will restart with soft ? start operation only
after the junction temperature drops below 125 ° C.
4.5 TO 13.2V
C1
C2
R1
COMP
LX
L1
VOUT
FB
NCP5252
VO
AGND
PGND
R4
C3
R2
C4
R3
GND
Figure 26. Typical Application Circuit
http://onsemi.com
13
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