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参数资料
| 型号： | IR3842MTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 15QFN |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 14.4 V |
| 输入电压： | 1.5 V ~ 16 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 225kHz ~ 1.65MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 15-PowerVQFN |
| 包装： | 标准包装 |
| 供应商设备封装： | PQFN（5x6） |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | IR3842MTR1PBFDKR |
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IR3842MPbF
Thermal Shutdown
Temperature sensing is provided inside IR3842.
The trip threshold is typically set to 140 o C. When
1.5V <Vin<16V
4.5V <Vcc<5.5V
trip threshold is exceeded, thermal shutdown
turns off both MOSFETs and discharges the soft
start capacitor.
Automatic restart is initiated when the sensed
temperature drops within the operating range.
PGood
Vcc
PGood
Seq
Rt
Enable
Vin
Boot
SW
OCSet
Fb
RA
RB
Vo(master)
There is a 20 o C hysteresis in the thermal
shutdown threshold.
SS/ SD
Gnd
PGnd
Comp
Output Voltage Sequencing
The IR3842 can accommodate user
programmable sequencing using Seq, Enable
1.5V <Vin<16V
4.5V <Vcc<5.5V
and Power Good pins.
Enable
Vin
Boot
Vo(master)
Vcc
SW
Vo(slave)
PGood
Vo1
RE
PGood
OCSet
RC
Seq
Fb
Vo2
RF
Rt
RD
SS/ SD
Gnd
PGnd
Comp
Simultaneous Powerup
Fig. 8b. Application Circuit for Simultaneous
Fig. 8a. Simultaneous Power-up of the slave
Sequencing
with respect to the master.
Power Good Output
Through these pins, voltage sequencing such as
simultaneous and sequential can be
implemented. Figure 8. shows simultaneous
sequencing configurations. In simultaneous
power-up, the voltage at the Seq pin of the slave
reaches 0.7V before the Fb pin of the master. For
R E /R F =R C /R D , therefore, the output voltage of
the slave follows that of the master until the
voltage at the Seq pin of the slave reaches 0.7 V.
After the voltage at the Seq pin of the slave
exceeds 0.85V, the internal 0.7V reference of
the slave dictates its output voltage.
It is recommended that irrespective of the
sequencing configuration used, the input voltage
should be allowed to come up to its nominal
value first, followed by V cc and Enable, before the
sequencing signal is applied.
For non-sequenced operation, the Seq pin
should be tied to a voltage greater than 0.85V,
such as 3.3V or V cc . Again, the input voltage
should be allowed to come up before V cc and
Enable.
06/18/09
The IC continually monitors the output voltage via
Feedback (Fb pin). The feedback voltage is
compared to a fixed voltage. As soon as the Fb
voltage reaches 0.88* V ref , the Power Good signal
flags. This pin is open drain and it needs to be
externally pulled high. High state indicates that
output is in regulation. Fig 9. shows the timing
diagram for the PGood function.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3842MTR1PBF | 制造商:International Rectifier 功能描述:IC DC/DC SUPIRBUCK 4A 15QFN 制造商:International Rectifier 功能描述:IC, DC/DC, SUPIRBUCK 4A 15QFN |
| IR3842MTRPBF | 功能描述:直流/直流开关调节器 4A SupIRBuck Reg 250-1500kHz, 1.5-16V 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 |
| IR3842WMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 4A SYNCHRONOUS BUCK REGULATOR |
| IR3842WMPBF_12 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 4A SYNCHRONOUS BUCK REGULATOR |
| IR3842WMTR1PBF | 功能描述:直流/直流开关调节器 4A SupIRBuck Reg 250-1500kHz, 1.5-16V 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 |
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