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19-3663; Rev 1; 6/07
Push-Pull FET Driver with Integrated Oscillator
and Programmable Clock Output
General Description
The MAX5077 is a +4.5V to +15V push-pull, current-fed
topology driver subsystem with an integrated oscillator
used in telecom module power supplies. The device
drives two MOSFETs connected to a center-tapped
transformer primary providing secondary-side, isolated,
negative or positive voltages. The MAX5077 features a
programmable accurate integrated oscillator with a
synchronizing clock output to synchronize an external
PWM regulator. A single external resistor programs the
internal oscillator frequency from 50kHz to 1.5MHz.
The MAX5077 incorporates dual MOSFET drivers with
±3A peak drive currents and 50% duty cycle. The
MOSFET drivers generate complementary signals to
drive external ground-referenced n-channel MOSFETs.
The MAX5077 clock output frequency is programmable
by logic inputs to set the clock output to 1x, 2x, or 4x
the MOSFET’s driver frequency.
The MAX5077 is available in a 14-pin exposed pad
TSSOP package and is specified over the -40°C to
Features
? Dedicated Current-Fed, Push-Pull Driver
Subsystem
? Oscillator Frequency Programmable from 50kHz
to 1.5MHz
? Single +4.5V to +15V Supply Voltage Range
? ±3A Peak Gate-Drive Current
? 1mA Operating Current at 250kHz with No
Capacitive Load
? Selectable Synchronizing Clock Frequency for a
Preceding PWM Stage
? Thermally Enhanced 14-Pin TSSOP
? -40°C to +125°C Operating Temperature Range
Ordering Information
+125°C operating temperature range.
Applications
PART
MAX5077AUD
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
14 TSSOP-EP*
PKG
CODE
U14E-3
Current-Fed Power Supplies
Power-Supply Building Subsystems
Push-Pull Driver Subsystems
* EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
V IN
V IN
DRVH
V OUT
SYNCIN
CLK
PWM
CONTROLLER
V CC
V CC
SEL1
I.C.
MAX5077
NDRV2
NDRV1
DRVL
RT
SEL2
GND
4.7k ?
AGND
DGND
PGND
1nF
GND
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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相关代理商/技术参数
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MAX5078AATT-T 功能描述:功率驱动器IC 4A 20ns MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube