参数资料
| 型号： | MC33470DW |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC/DC SYNC RECT 20-SOIC |
| 产品变化通告： | Product Obsolescence 11/Feb/2009 |
| 标准包装： | 38 |
| 应用： | 控制器，Intel Pentium? II |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 管件 |
MC33470
PIN FUNCTION DESCRIPTION
PV
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
G2
CC
P GND
A GND
V CC
Sense
I max
I FB
SS
Comp
OT
Fault
P wrgd
VID4
VID3
VID2
VID1
VID0
OUTEN
G1
Description
This is a high current dual totem pole output Gate Drive for the Lower, or rectifier, N?channel MOSFET. Its output
swings from ground to P VCC . During initial power application, both G2 and G1 are held low until both V CC and
P VCC have reached proper levels.
This is a separate power source connection for driving N?channel MOSFETs from the G1 and G2 outputs. It may
be connected to 12 V.
This is a separate power ground return that is connected back to the power source. It is used to reduce the
effects of switching transient noise on the control circuitry.
This pin is the ground for the control circuitry.
This pin is the positive supply of the control IC.
This pin is used for feedback from the output of the power supply. It has a 20 m A current source to ground which
can be used to provide offset in the converter output voltage.
This pin sets the current limit threshold. 190 m A must be sourced into the pin. The external resistor is determined
from the following equation: R = ([R DS(on) ] [I LIM ]/[190 m A])
This pin has two functions. First, it provides cycle?by?cycle current limiting. Second, if the current is excessive,
this pin will reinitiate a soft?start cycle. If the voltage at the I FB pin drops below the voltage at the I max pin when
G1 is on, the controller will go into current limit. The current limit circuit can be disabled by floating the I max pin
and shorting the I FB pin to V CC .
This is the soft?start pin. A capacitor at this pin, in conjunction with a 10 m A internal current source, sets the
soft?start time. During moderate overload (current limit with V O > 50% of the set value), the soft?start capacitor
will be discharged by an internal 90 m A current source in order to reduce the duty cycle of G1. During hard
current limit (current limit with V O < 50% of set value), the soft?start capacitor will be discharged by a 64 mA
current source.
This pin is provided for compensating the error amp for poles and zeros encountered in the power supply system,
mostly the output LC filter.
This is the over temperature fault pin. OT is an open drain output that will be pulled low if the OUTEN pin is less
than 2.0 V.
This pin indicates a fault condition. Fault is an open drain output that switches low if V O exceeds 115% of its set
value. Once triggered, the controller will remain in this state until the power supply is recycled or the OUTEN pin
is toggled.
This pin is an open drain output which indicates that V O is properly regulated. A high level on P wrgd indicates that
V O is within " 4% of its set value for more than 400 m s. P wrgd will switch low if V O is outside " 4% for more than
100 m s.
Voltage ID pin. This CMOS?compatible input programs the output voltage as shown in Table 2. This pin has an
internal 10 k pullup resistor to V CC .
Voltage ID pin. This CMOS?compatible input programs the output voltage as shown in Table 2. This pin has an
internal 10 k pullup resistor to V CC .
Voltage ID pin. This CMOS?compatible input programs the output voltage as shown in Table 2. This pin has an
internal 10 k pullup resistor to V CC .
Voltage ID pin. This CMOS?compatible input programs the output voltage as shown in Table 2. This pin has an
internal 10 k pullup resistor to V CC .
Voltage ID pin. This CMOS?compatible input programs the output voltage as shown in Table 2. This pin has an
internal 10 k pullup resistor to V CC .
This is the on/off control pin. A CMOS?compatible logic “1” allows the controller to operate. This pin can also be
used as a temperature sensor to trigger the OT pin (when OUTEN drops below 2.0 V OT pulls low). When
OUTEN drops below 1.7 V for longer than 50 m s, the controller will shut down.
This is a high current dual totem pole output Gate Drive for the Upper, or switching, N?channel MOSFET. Its
output swings from ground to P VCC . During initial power application, both G2 and G1 are held low until both V CC
and P VCC have reached proper levels.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC33470DWG | 功能描述:直流/直流开关调节器 5-Bit Synchronous Rectification Buck RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MC33470DWR2 | 功能描述:直流/直流开关调节器 5-Bit Synchronous RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MC33470DWR2G | 功能描述:直流/直流开关调节器 5-Bit Synchronous Rectification Buck RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MC33486ADH | 功能描述:电源开关 IC - 配电 DUALHIGH-SIDE BRIDGE RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MC33486ADHR2 | 功能描述:电源开关 IC - 配电 DUALHIGH-SIDE BRIDGE RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
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