FET Driver. MAX5077 Datasheet

MAX5077 Driver. Datasheet pdf. Equivalent

Part MAX5077
Description Push-Pull FET Driver
Feature 19-3663; Rev 0; 5/05 www.DataSheet4U.com Push-Pull FET Driver with Integrated Oscillator and Progr.
Manufacture Maxim Integrated Products
Datasheet
Download MAX5077 Datasheet



MAX5077
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
+125°C operating temperature range.
Applications
Current-Fed Power Supplies
Power-Supply Building Subsystems
Push-Pull Driver Subsystems
VIN
VIN
DRVH
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
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
MAX5077AUD -40°C to +125°C 14 TSSOP-EP* U14E-3
*EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
VOUT
SYNCIN
PWM
CONTROLLER
DRVL
GND
GND
VCC
4.7k
1nF
CLK
MAX5077
VCC NDRV2
SEL1
I.C.
NDRV1
RT SEL2
AGND DGND PGND
________________________________________________________________ Maxim Integrated Products 1
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.



MAX5077
Push-Pull FET Driver with Integrated Oscillator
and Programmable Clock Output
ABSOLUTE MAXIMUM RATINGS
VCC to AGND, DGND, PGND.................................-0.3V to +18V
PGND, DGND to AGND ........................................-0.3V to +0.3V
SEL1, SEL2 to DGND .............................................-0.3V to +18V
CLK, RT to AGND.....................................................-0.3V to +6V
NDRV1, NDRV2 to PGND...........................-0.3V to (VCC + 0.3V)
CLK Current......................................................................±20mA
NDRV1, NDRV2 Peak Current (200ns) ..................................±5A
NDRV1, NDRV2 Reverse Current (Latchup Current) .....±500mA
Continuous Power Dissipation (TA = +70°C)
14-Pin TSSOP (derate 20.8mW/°C above +70°C) .....1667mW
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +12V, SEL1 = VCC, SEL2 = DGND, RRT = 124k, NDRV1 = NDRV2 = open, TA = TJ = -40°C to +125°C, unless otherwise
noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SUPPLY
Input Voltage Supply Range
Static Supply Current
Switching Supply Current
Undervoltage Lockout
UVLO Hysteresis
OSCILLATOR
Frequency Range
Accuracy
Oscillator Jitter
SYMBOL
VCC
ICCST
ICCSW
VUVLO
fOSC
CLK Output High Voltage
CLK Output Low Voltage
CLK Output Rise Time
CLK Output Fall Time
GATE DRIVERS (NDRV1, NDRV2)
CONDITIONS
SEL2 = SEL1 = DGND, drivers not switching
SEL2 = DGND, SEL1 = VCC, fOSC = 250kHz
VCC rising
(Note 2)
fOSC = 250kHz, 6V VCC 15V (Note 3)
ICLK = 1mA
ICLK = -1mA
CCLK = 30pF
CCLK = 30pF
7V VCC 15V
4.5V VCC 7V
MIN
4.5
3
50
-8
3.9
3.35
TYP
150
1
3.5
300
±0.6
35
10
MAX UNITS
15.0 V
320 µA
3 mA
4V
mV
1500
+10
5.0
5.0
50
kHz
%
%
V
mV
ns
ns
Output High Voltage
Output Low Voltage
Output Peak Current
Driver Output Impedance
Latchup Current Protection
Rise Time
Fall Time
VOH
VOL
IP
tR
tF
INDRV1 = INDRV2 = 100mA
INDRV1 = INDRV2 = -100mA
Sourcing and sinking
NDRV_ sourcing 100mA
NDRV_ sinking 100mA
Reverse current at NDRV1/NDRV2
CLOAD = 2nF
CLOAD = 2nF
VCC -
0.3
3
1.8
1.6
400
10
10
0.3
3
2.6
V
V
A
mA
ns
ns
2 _______________________________________________________________________________________







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