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MAX5078

4A, 20ns, MOSFET Driver

General Description

The MAX5078A/MAX5078B high-speed MOSFET drivers

source and sink up to 4A peak current. These devices

feature a fast 20ns propagation delay and 20ns rise and

fall times while driving a 5000pF capacitive load.

Propagation delay time is minimized and matched

between the inverting and noninverting inputs. High

sourcing/sinking peak currents, low propagation delay,

and thermally enhanced packages make the MAX5078A/

MAX5078B ideal for high-frequency and high-power

circuits.

The MAX5078A/MAX5078B operate from a 4V to 15V

single power supply and consume 40µA (typ) of supply

current when not switching. These devices have an

internal logic circuitry that prevents shoot-through during

output state changes to minimize the operating current

at a high switching frequency. The logic inputs are pro-

tected against voltage spikes up to +18V, regardless of

the V

voltage. The MAX5078A has CMOS input logic

levels while the MAX5078B has TTL-compatible input

logic levels.

The MAX5078A/MAX5078B feature both inverting and

noninverting inputs for greater flexibility in controlling the

MOSFET. They are available in a 6-pin TDFN (3mm x

3mm) package and operate over the automotive temper-

ature range of -40°C to +125°C.

Applications

Power MOSFET Switching Motor Control

Switch-Mode Power Supplies Power-Supply Modules

DC-DC Converters

Features

o 4V to 15V Single Power Supply

o 4A Peak Source/Sink Drive Current

o 20ns (typ) Propagation Delay

o Matching Delay Between Inverting and

Noninverting Inputs

o V

/ 2 CMOS (MAX5078A)/TTL (MAX5078B) Logic

Inputs

o 0.1 x V

(CMOS) and 0.3V (TTL) Logic-Input

Hysteresis

o Up to +18V Logic Inputs (Regardless of V

Voltage)

o Low Input Capacitance: 2.5pF (typ)

o 40µA (typ) Quiescent Current

o -40°C to +125°C Operating Temperature Range

o 6-Pin TDFN Package

Ordering Information

MAX5078A

MAX5078B

IN+

IN-

OUT

GND

4V TO 15V

PWM IN

Typical Operating Circuit

19-3346; Rev 2; 9/12

EP = Exposed pad.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

/V denotes an automotive qualified part.

Note: Devices are also available in a tape-and-reel package. Specify

tape and reel by adding "T" to the part number when ordering.

PART TEMP RANGE PIN-PACKAGE

MAX5078AATT+ -40°C to +125°C 6 TDFN-EP*

MAX5078AATT/V+ -40°C to +125°C 6 TDFN-EP*

MAX5078BATT+ -40°C to +125°C 6 TDFN-EP*

MAX5078BATT/V+ -40°C to +125°C 6 TDFN-EP*

Selector Guide

PART PIN-PACKAGE LOGIC INPUT

MAX5078AATT 6 TDFN-EP V

/ 2 CMOS

MAX5078BATT 6 TDFN-EP TTL

6 IN+1

IN-

TDFN-EP

TOP VIEW

GND 2

GND

OUT

MAX5078

Pin Configuration

Summary of content (13 pages)

PAGE 1
MAX5078 4A, 20ns, MOSFET Driver General Description The MAX5078A/MAX5078B high-speed MOSFET drivers source and sink up to 4A peak current. These devices feature a fast 20ns propagation delay and 20ns rise and fall times while driving a 5000pF capacitive load. Propagation delay time is minimized and matched between the inverting and noninverting inputs.
PAGE 2
MAX5078 4A, 20ns, MOSFET Driver ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) VDD...............................................................................-0.3V to +18V IN+, IN- ........................................................................-0.3V to +18V OUT .................................................................-0.3V to (VDD + 0.3V) OUT Short-Circuit Duration.......................................................10ms Continuous Source/Sink Current at OUT_ (PD < PDMAX) .....
PAGE 3
MAX5078 4A, 20ns, MOSFET Driver ELECTRICAL CHARACTERISTICS (continued) (VDD = 4V to 15V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = 15V and TA = +25°C.) (Note 1) PARAMETER SYMBOL Output-Voltage High CONDITIONS MIN VDD = 4.5V VDD 0.55 VDD = 15V VDD 0.275 IOUT = 100mA TYP MAX UNITS V LOGIC INPUT (Note 3) Logic 1 Input Voltage VIH MAX5078A MAX5078B (Note 4) Logic 0 Input Voltage Logic-Input Hysteresis VIL VHYS Logic-Input-Current Leakage Input Capacitance 0.
PAGE 4
MAX5078 4A, 20ns, MOSFET Driver ELECTRICAL CHARACTERISTICS (continued) (VDD = 4V to 15V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = 15V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MATCHING CHARACTERISTICS Mismatch Propagation Delays from Inverting and Noninverting Inputs to Output Note 1: Note 2: Note 3: Note 4: ∆tON-OFF VDD = 15V, CL = 10,000pF 2 VDD = 4.5V, CL = 10,000pF 4 ns All devices are 100% tested at TA = +25°C.
PAGE 5
MAX5078 4A, 20ns, MOSFET Driver Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) VIN RISING 6 5 4 VIN FALLING 3 2 VIN RISING 2.0 1.5 1.0 VIN FALLING MAX5078 toc09 MAX5078B (TTL INPUT) VDD = 15V 400 SUPPLY CURRENT (µA) 7 MAX5078B (TTL INPUT) 2.5 500 MAX5078 toc08 8 3.0 INPUT THRESHOLD VOLTAGE (V) MAX5078A (CMOS INPUT) 9 INPUT THRESHOLD VOLTAGE (V) MAX5078 toc07 10 SUPPLY CURRENT vs. LOGIC-INPUT VOLTAGE (INPUT LOW-TO-HIGH) INPUT THRESHOLD VOLTAGE vs.
PAGE 6
MAX5078 4A, 20ns, MOSFET Driver Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) LOGIC-INPUT VOLTAGE vs. OUTPUT VOLTAGE (VDD = 4V, CL = 10,000pF) LOGIC-INPUT VOLTAGE vs. OUTPUT VOLTAGE (VDD = 4V, CL = 5000pF) MAX5078 toc16 MAX5078 toc17 MAX5078B (TTL INPUT) MAX5078B (TTL INPUT) IN2V/div IN2V/div OUT 2V/div OUT 2V/div IN+ = VDD IN+ = VDD 40ns/div 20ns/div LOGIC-INPUT VOLTAGE vs. OUTPUT VOLTAGE (VDD = 4V, CL = 10,000pF) LOGIC-INPUT VOLTAGE vs.
PAGE 7
MAX5078 4A, 20ns, MOSFET Driver Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) LOGIC-INPUT VOLTAGE vs. OUTPUT VOLTAGE (VDD = 15V, CL = 5000pF) MAX5078 toc21 LOGIC-INPUT VOLTAGE vs. OUTPUT VOLTAGE (VDD = 15V, CL = 10,000pF) MAX5078 toc22 MAX5078B (TTL INPUT) MAX5078B (TTL INPUT) IN2V/div IN2V/div OUT 5V/div OUT 5V/div IN+ = VDD IN+ = VDD 40ns/div 20ns/div VDD vs. OUTPUT VOLTAGE VDD vs.
PAGE 8
MAX5078 4A, 20ns, MOSFET Driver Pin Description PIN NAME FUNCTION 1 IN- 2, 3 GND Inverting Logic-Input Terminal. Connect to GND when not used. Ground 4 VDD Power Supply. Bypass to GND with one or more 0.1µF ceramic capacitors. 5 OUT Driver Output. Sources or sinks current to turn the external MOSFET on or off. 6 IN+ Noninverting Logic-Input Terminal. Connect to VDD when not used. — EP Exposed Pad. Internally connected to GND.
PAGE 9
MAX5078 4A, 20ns, MOSFET Driver IN+ VIH VIL VDD MAX5078A MAX5078B 90% IN- OUT 10% tD-OFF1 tD-ON1 tF IN- tR P BREAKBEFOREMAKE CONTROL IN+ OUT N VIH VIL tD-OFF2 tD-ON2 GND RISING MISMATCH = tD-ON2 - tD-ON1 FALLING MISMATCH = tD-OFF2 - tD-OFF1 Figure 1. Timing Diagram Figure 2.
PAGE 10
MAX5078 4A, 20ns, MOSFET Driver Table 1. MAX5078 Truth Table IN+ IN- OUT Low Low Low Low High Low High Low High High High Low VDD MAX5078 PWM INPUT OFF Use the following PC board layout guidelines when designing with the MAX5078A/MAX5078B: • • • • • Place one or more 0.1µF decoupling ceramic capacitors from VDD to GND as close to the device as possible. Connect VDD and GND to large copper areas.
PAGE 11
MAX5078 4A, 20ns, MOSFET Driver 4V TO 15V VDD IN+ MAX5078A MAX5078B OUT P INFROM PWM CONTROLLER (BOOST) GND VDD IN+ VOUT MAX5078A MAX5078B OUT N INGND Figure 6. MAX5078A/MAX5078B In High-Power Synchronous Buck Converter VIN VOUT 4V TO 15V VDD 4V TO 15V VDD MAX5078 PWM IN VDD OUT IN+ MAX5078 MAX5078 OUT IN- GND IN+ OUT IN+ GND IN- IN- GND SIGNAL FROM PRIMARY Figure 7.
PAGE 12
MAX5078 4A, 20ns, MOSFET Driver Package Information Chip Information PROCESS: CMOS 12 For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 13
MAX5078 4A, 20ns, MOSFET Driver Revision History REVISION NUMBER REVISION DATE 2 9/12 DESCRIPTION Added automotive qualified parts to Ordering Information PAGES CHANGED 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.