max5077audt Maxim Integrated Products, Inc., max5077audt Datasheet

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max5077audt

Manufacturer Part Number
max5077audt
Description
Max5077 Push-pull Fet Driver With Integrated Oscillator And Programmable Clock Output
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
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
+125°C operating temperature range.
19-3663; Rev 1; 6/07
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.
Push-Pull FET Driver with Integrated Oscillator
Current-Fed Power Supplies
Power-Supply Building Subsystems
Push-Pull Driver Subsystems
GND
V
IN
CONTROLLER
GND
PWM
V
IN
SYNCIN
________________________________________________________________ Maxim Integrated Products
DRVH
DRVL
General Description
Applications
and Programmable Clock Output
4.7kΩ
1nF
V
CC
CLK
V
I.C.
AGND
SEL1
RT
CC
MAX5077
DGND
NDRV2
NDRV1
♦ Dedicated Current-Fed, Push-Pull Driver
♦ Oscillator Frequency Programmable from 50kHz
♦ Single +4.5V to +15V Supply Voltage Range
♦ ±3A Peak Gate-Drive Current
♦ 1mA Operating Current at 250kHz with No
♦ Selectable Synchronizing Clock Frequency for a
♦ Thermally Enhanced 14-Pin TSSOP
♦ -40°C to +125°C Operating Temperature Range
PGND
*EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
MAX5077AUD
SEL2
Subsystem
to 1.5MHz
Capacitive Load
Preceding PWM Stage
PART
Typical Operating Circuit
-40°C to +125°C 14 TSSOP-EP*
TEMP RANGE
Ordering Information
PIN-PACKAGE
Features
U14E-3
CODE
PKG
V
OUT
1

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max5077audt Summary of contents

Page 1

Rev 1; 6/07 Push-Pull FET Driver with Integrated Oscillator 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 ...

Page 2

Push-Pull FET Driver with Integrated Oscillator and Programmable Clock Output ABSOLUTE MAXIMUM RATINGS V to AGND, DGND, PGND.................................-0.3V to +18V CC PGND, DGND to AGND ........................................-0.3V to +0.3V SEL1, SEL2 to DGND .............................................-0.3V to +18V CLK AGND.....................................................-0.3V to ...

Page 3

Push-Pull FET Driver with Integrated Oscillator ELECTRICAL CHARACTERISTICS (continued +12V, SEL1 = V , SEL2 = DGND noted. Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL SEL_ INPUTS Input Current Input ...

Page 4

Push-Pull FET Driver with Integrated Oscillator and Programmable Clock Output (V = +12V, SEL1 = V , SEL2 = DGND CLK FALL TIME vs. SUPPLY VOLTAGE 30pF CLK ...

Page 5

Push-Pull FET Driver with Integrated Oscillator PIN NAME 1, 8 N.C. No Connection. Must be left unconnected. 2 SEL1 CLK Frequency Ratio Select Input. Use SEL1 and SEL2 to set f Synchronizing Clock Output. Clock output with a ±10mA peak ...

Page 6

Push-Pull FET Driver with Integrated Oscillator and Programmable Clock Output Detailed Description The MAX5077 is a +4.5V to +15V push-pull, current-fed topology driver subsystem with an integrated oscillator for use in 48V module power supplies. The MAX5077 features a programmable ...

Page 7

Push-Pull FET Driver with Integrated Oscillator Applications Information Supply Bypassing Pay careful attention to bypassing and grounding the MAX5077. Peak supply and output currents may exceed 3A when driving large MOSFETs. Ground shifts due to insufficient device grounding may also ...

Page 8

Push-Pull FET Driver with Integrated Oscillator and Programmable Clock Output Pin Configuration TOP VIEW N.C. 1 SEL1 2 CLK 3 MAX5077 I. AGND 6 DGND 7 *EP TSSOP *EXPOSED PADDLE CONNECTED TO DGND. 8 _______________________________________________________________________________________ TRANSISTOR COUNT: ...

Page 9

... Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2007 Maxim Integrated Products and Programmable Clock Output is a registered trademark of Maxim Integrated Products, Inc. Package Information PACKAGE OUTLINE, TSSOP, 4.40 MM BODY, EXPOSED PAD ...

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