IR3638SPBF

厂商：
IRF
封装：
描述：
IR3638SPBF - HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS - Internationa...

数据手册：

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数据手册
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IR3638SPBF 数据手册

Data Sheet No.PD94724 IR3638SPbF HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS Features • • • • • • Power up Sequencing / Tracking Enable Input Internal 400kHz Oscillator Programmable Soft-Start Fixed Frequency Voltage Mode Output Voltage as low as 0.6V Description The IR3638 controller IC is designed to provide a simple synchronous Buck regulator for on-board DC to DC applications in a 14-pin SOIC. The IR3638 is designed specifically for tracking applications by providing the track input. The IR3638 operates at a fixed internal 400kHz switching frequency allowing the use of small external components. The device features a programmable soft start set by an external capacitor, under-voltage lockout and output under-voltage detection that latches off the device when an output short is detected. Applications • • • • • Tracking Applications Game Consoles Computing Peripheral Voltage Regulators Graphics Cards General DC/DC Converters 12V 5V C1 C2 C3 Vcc Vc HDrv Q1 D1 L1 Vout Q2 C7 V_CPUCore Vp / Enable LDrv SS C6 PGnd R1 Fb Gnd R2 Comp C4 C5 R3 Fig. 1: Typical Application Circuit ORDERING INFORMATION PKG PACKAGE DESIG DESCRIPTION S IR3638STRPbF PIN PARTS PARTS COUNT PER TUBE PER REEL 14 ---2500 T&R ORIANTAION Figure A 3/19/07 IR3638SPbF ABSOLUTE MAXIMUM RATINGS Caution: Stresses beyond those listed below may cause permanent damage to the device. These are stress ratings only and function of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. (Voltages referenced to GND) • • • • • • Vcc Supply Voltage ................................................… -0.5V to 16V Vc Supply Voltage …………………………………… -0.5V to 25V Storage Temperature Range ..................................... -65°C To 150°C Operating Junction Temperature Range ................... 0°C To 150°C ESD Classification …………………………………..… JEDEC, JESD22-A114 Moisture Sensitivity Level ……………………………. JEDEC Level 2 @ 260oC Package Information Fb 1 VP 2 NC 3 Vcc 4 NC 5 LDrv 6 Gnd 7 14 NC 13 SS 12 Comp 11 NC 10 Vc 9 HDrv 8 PGnd 14-Pin SOIC NB (S) ΘJA = 88o C/W 3/19/07 2 IR3638SPbF Block Diagram 250mV Vcc 4 4.25V 50mV POR 10 Vc 3V 22uA SS 13 POR 64uA Error Comp R Reset Dom VP 2 Fb 1 Comp 12 25K 25K Error Amp 0.4V FbLo Comp 2V SS Pre-Bias Comparator 6 LDrv Q Vcc 0.65V Ramp Oscillator S 9 HDrv 8 PGnd 7 Gnd POR Fig. 2: Simplified block diagram of the IR3638 3/19/07 3 IR3638SPbF Pin Description Pin 1 Name Fb Description Inverting input to the error amplifier. This pin is connected to the output of the regulator via resistor divider to set the output voltage and provide feedback to the error amplifier. Dual function pin. Non inverting input to the error amplifier. Enable input. No Connect This pin provides power for the internal blocks of the IC as well as powers the low side driver. A minimum of 0.1uF, high frequency capacitor must be connected from this pin to power ground. No Connect Output driver for low side MOSFET. IC ground for internal control circuitry. Power Ground. This pin serves as a separate ground for the MOSFET drivers and should be connected to the system’s power ground plane. Output driver for high side MOSFET. The negative voltage at this pin may cause instability for the gate drive circuit. To prevent this, a low forward voltage drop diode (e.g. BAT54 or 1N4148) is required between this pin and Power Ground. This pin powers the high side driver. No Connect Output of error amplifier. An external resistor and capacitor network is typically connected from this pin to ground to provide loop compensation. Soft start. This pin provides user programmable soft-start function. Connect an external capacitor from this pin to ground to set the start up time of the output voltage. No Connect 2 Vp / Enable 3 4 NC Vcc 5 6 7 8 9 NC LDrv Gnd PGnd HDrv 10 11 12 13 Vc NC Comp SS 14 NC 3/19/07 4 IR3638SPbF Recommended Operating Conditions Symbol Vcc Vc Tj Definition Supply Voltage Supply Voltage Junction Temperature Min 5 Converter Voltage + 5V 0 Max 13.2 20 125 Units V V o C Electrical Specifications Unless otherwise specified, these specification apply over Vcc=Vc=12V, 0oC

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IR3638SPBF

1. 物料型号：IR3638SPbF 2. 器件简介：IR3638控制器IC设计用于提供简单的同步降压调节器，用于板上DC到DC应用，特别适用于跟踪应用。

3. 引脚分配： - 1号引脚(Fb)：错误放大器的反相输入。 - 2号引脚(Vp/Enable)：双功能引脚，错误放大器的非反相输入和使能输入。 - 3号引脚(NC)：不连接。 - 4号引脚(Vcc)：为IC内部模块供电。 - 6号引脚(LDrv)：低侧MOSFET的输出驱动。 - 7号引脚(Gnd)：IC内部控制电路的地。 - 8号引脚(PGnd)：MOSFET驱动器的独立地。 - 9号引脚(HDrv)：高侧MOSFET的输出驱动。 - 10号引脚(Vc)：为高侧驱动器供电。 - 12号引脚(Comp)：错误放大器的输出。 - 13号引脚(SS)：软启动功能引脚。

4. 参数特性： - 工作频率：内部400kHz振荡器。 - 输出电压：最低可至0.6V。 - 供电电压：Vcc 5V至13.2V，Vc 5V至20V。 - 启动阈值和停止阈值：Vcc和使能输入的UVLO阈值。 - 软启动：通过外部电容设置。

5. 功能详解： - IR3638是一款电压模式PWM同步控制器，具有固定400kHz的开关频率。 - 欠压锁定和软启动功能。 - 短路保护：当输出电压低于0.4V时关闭PWM信号并锁定。

6. 应用信息： - 跟踪应用、游戏机、计算外设电压调节器、显卡等DC/DC转换器。

7. 封装信息：14引脚SOIC表面贴装，窄体封装。

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