参数资料
型号: SP7656EN2-L
厂商: Exar Corporation
文件页数: 3/10页
文件大小: 0K
描述: IC REG BUCK ADJ 3A 8HNSOIC
标准包装: 98
系列: Power Blox™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 28 V
输入电压: 4.5 V ~ 29 V
PWM 型: 电压模式
频率 - 开关: 600kHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm Width)裸露焊盘
包装: 管件
供应商设备封装: 8-HSOICN
其它名称: 1016-1443
SP7656EN2-L-ND
PIN DESCRIPTION
PIN #
1
2
3
4,5
6
7,9
8
5V
PIN NAME
FB
GND
VDR
PVIN
SVIN
LX
ISET
DESCRIPTION
Regulator feedback input. Connect to a resistive voltage-divider network to set the
output voltage. This pin can be also used for ON/OFF control. If this pin is pulled above
1V the controller resets internal soft start circuit.
Ground pin.
Power supply for the internal driver. This voltage is internally regulated to about 5V
below VIN. Place a 0.1uF decoupling capacitor between VDR and Vin as close as
possible to the IC.
Internal P-Channel FET Source. Connect to input voltage.
Input power supply for the controller. Place input decoupling capacitor as close as
possible to this pin. Connect to input voltage.
Internal P-Channel FET Drain. Connect to the output inductor.
This pin is used as a current limit input for the internal current limit comparator. Connect
to LX through an optional resistor. Internal threshold is pre-set to 300mV nominal and
can be decreased by changing the external resistor based on the following formula:
V TRSHLD = 300mV – 30uA * R. Where R≤3k ?
CONVERTER BLOCK DIAGRAM
SVIN
VDR
VIN
Oscillator
I = k x VIN
Vin - 5V LDO
5V Internal LDO
PVIN
FAULT
VREF
PWM Latch
Reset Dominant
S
FET GATE
FB
+
-
+
-
PWM Comparator
R
R
VDR
Internal
P-FET
LX
Error Amplifier
FAULT
FAULT
ENBL
Power PAD
ISET
UVLO
FAULT
200ms delay
Register
S
4-Bit counter
Overcurrent
Comparator
VIN - 0.3V
30uA
GND
+
R
POR
1V
-
11/07/08 SP7656 PowerBlox
R
Set Dominant
3
? Copyright 2008 EXAR Corporation
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