参数资料
| 型号： | BD8314NUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 4/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2.5A SON10 |
| 标准包装： | 3,000 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4 V ~ 12 V |
| 输入电压： | 3 V ~ 12 V |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | VSON010V3030 |
BD8314NUV
● Description of Blocks
Technical Note
1.
2.
3.
4.
5.
6.
7.
8.
9.
VREF
This block generates ERROR AMP reference voltage.
The reference voltage is 1.0 V.
UVLO
Circuit for preventing low voltage malfunction
Prevents malfunction of the internal circuit at activation of the power supply voltage or at low power supply voltage.
Monitors VREG pin voltage to turn off all output FET and DC/DC converter output when VREG voltage is lower than
2.4 V, and reset the timer latch of the internal SCP circuit and soft-start circuit. This threshold contains 100 mV
hysteresis.
SCP
Timer latch system short-circuit protection circuit
When the INV pin is the set 1.0 V or lower voltage, the internal SCP circuit starts counting. The internal counter is in
synch with OSC; the latch circuit activates after a lapse of 13.3 msec after the counter counts about 16000 oscillations
and then, turn off DC/DC converter output. To reset the latch circuit, turn off the STB pin once. Then, turn it on again or
turn on the power supply voltage again.
OSC
Circuit for oscillating saw tooth waves with an operation frequency fixed at 1.2 MHz
ERROR AMP
Error amplifier for detecting output signals and outputting PWM control signals
The internal reference voltage is set at 1.0 V.
A primary phase compensation device of 200 pF, 62 k ? is built in between the inverting input terminal and the output
terminal of this ERROR AMP.
PWM COMP
Voltage-pulse width converter for controlling output voltage corresponding to input voltage
Comparing the internal SLOPE waveform with the ERROR AMP output voltage, PWM COMP controls the pulse width
to the output to the driver.
Max Duty is set at 85%.
SOFT START
Circuit for preventing in-rush current at startup by bringing the output voltage of the DC/DC converter into a soft-start
Soft-start time is in synch with the internal OSC, and the output voltage of the DC/DC converter reaches the set voltage
after about 10000 oscillations.
PRE DRIVER
CMOS inverter circuit for driving the built-in Nch FET.
STBY_IO
Voltage applied on STB pin (8 pin) to control ON/OFF of IC
Turned ON when a voltage of 2.5 V or higher is applied and turned OFF when the terminal is open or 0 V is applied.
Incorporates approximately 400 k ? pull-down resistance.
10. Nch FET SW
Built-in SW for switching the coil current of the DC/DC converter. Incorporates an 80 m ? NchFET SW capable of
withstanding 14 V. Since the current rating of this FET is 2.5 A (DC), it should be used within 3.5 A including the DC
current (within 2.5A) and ripple current of the coil.
www.rohm.com
? 2013 ROHM Co., Ltd. All rights reserved.
4/14
2013.12 - Rev.F
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