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General Description

The MAX15018A/MAX15018B/MAX15019A/MAX15019B

high-frequency, 125V half-bridge, n-channel MOSFET

drivers drive high- and low-side MOSFETs in high-volt-

age applications. These drivers are independently con-

trolled, and their 35ns (typ) propagation delay, from input

to output, are matched to within 2ns (typ). The high-volt-

age operation with very low and matched propagation

delay between drivers, and high source-/sink-current

capabilities in a thermally enhanced package make

these devices suitable for high-power, high-frequency

telecom power converters. The 125V maximum input

voltage provides plenty of margin over the 100V input

transient requirement of telecom standards. A reliable

on-chip bootstrap diode connected between V

and

BST eliminates the need for an external discrete diode.

The MAX15018A/MAX15019A both offer noninverting dri-

vers. The MAX15018B/MAX15019B offer a noninverting

high-side driver and an inverting low-side driver (see the

Selector Guide

.) The MAX15018_ feature CMOS (V

/2)

logic inputs. The MAX15019_ feature TTL-logic inputs.

The drivers are available in the industry-standard 8-pin

SO footprint and pin configuration with a thermally

enhanced 8-pin SO package. All devices operate over

the -40°C to +125°C automotive temperature range.

Applications

Telecom Power Supplies

Synchronous Buck DC-to-DC Converters

Half-Bridge, Full-Bridge, and Two-Switch

Forward Converters

Power-Supply Modules

Motor Control

Features

o HIP2100IB/HIP2101IB Pin Compatible

(MAX15018A/MAX15019A)

o Up to 125V V

Operation

o 8V to 12.6V V

Input Supply Range

o 3A Peak Source and Sink Current

o 35ns Propagation Delay

o Guaranteed 8ns or Less Propagation Delay

Matching Between High- and Low-Side Drivers

o Both Noninverting/Noninverting and

Noninverting/Inverting Logic-Input Versions

Available

o Up to 15V Logic Inputs, Independent of V

Supply Voltage

o Low 8pF Input Capacitance

o Available in CMOS (V

/2) or TTL Logic-Level

Inputs with Hysteresis

o Available in a Space-Saving, Thermally Enhanced

8-Pin SO-EP Package

MAX15018/MAX15019

125V/3A, High-Speed,

Half-Bridge MOSFET Drivers

________________________________________________________________

Maxim Integrated Products

MAX15018A

MAX15018B

MAX15019A

MAX15019B

81V

72BST GND

63DH IN_L

54HS IN_H

SO-EP

TOP VIEW

Pin Configuration

Ordering Information

MAX15018A

MAX15019A

BST

PWM1

PWM2

IN_H

IN_L

OUT

= 0 TO 125V

BST

= 8V TO

12.6V

VDD

GND

PART TEMP RANGE PIN-PACKAGE

MAX15018AASA+

-40°C to +125°C 8 SO-EP*

MAX15018BASA+

-40°C to +125°C 8 SO-EP*

MAX15019AASA+

-40°C to +125°C 8 SO-EP*

MAX15019BASA+

-40°C to +125°C 8 SO-EP*

Typical Operating Circuit

19-4146; Rev 1; 9/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Denotes a lead-free/RoHS-compliant package.

EP = Exposed pad. Internally connected to GND.

Summary of content (14 pages)

PAGE 1
9-4146; Rev 1; 9/08 125V/3A, High-Speed, Half-Bridge MOSFET Drivers Features The MAX15018A/MAX15018B/MAX15019A/MAX15019B high-frequency, 125V half-bridge, n-channel MOSFET drivers drive high- and low-side MOSFETs in high-voltage applications. These drivers are independently controlled, and their 35ns (typ) propagation delay, from input to output, are matched to within 2ns (typ).
PAGE 2
MAX15018/MAX15019 125V/3A, High-Speed, Half-Bridge MOSFET Drivers ABSOLUTE MAXIMUM RATINGS VDD to GND ............................................................-0.3V to +15V IN_H, IN_L to GND .................................................-0.3V to +15V DL to GND ..................................................-0.3V to (VDD + 0.3V) DH to HS.....................................................-0.3V to (VDD + 0.3V) BST to HS ...............................................................-0.
PAGE 3
125V/3A, High-Speed, Half-Bridge MOSFET Drivers (VDD = VBST = 8V to 12.6V, VHS = VGND = 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = VBST = 12V and TA = +25°C.
PAGE 4
MAX15018/MAX15019 125V/3A, High-Speed, Half-Bridge MOSFET Drivers ELECTRICAL CHARACTERISTICS (continued) (VDD = VBST = 8V to 12.6V, VHS = VGND = 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = VBST = 12V and TA = +25°C.
PAGE 5
125V/3A, High-Speed, Half-Bridge MOSFET Drivers VDD AND BST UNDERVOLTAGE LOCKOUT vs. TEMPERATURE 7.3 7.1 7.0 VBST - VHS RISING 6.9 0.58 0.56 HYSTERESIS (V) 7.3V 0.54 VDD 0.52 0.48 0.46 6.7 0.44 6.6 0.42 VDL 5V/div VBST - VHS 0.40 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 AMBIENT TEMPERATURE (°C) AMBIENT TEMPERATURE (°C) UNDERVOLTAGE LOCKOUT RESPONSE (VDD FALLING) MAX15018A IDDO + IBSTO CURRENT vs. VDD (250kHz SWITCHING) 4.
PAGE 6
Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) DH AND DL OUTPUT HIGH VOLTAGE vs. TEMPERATURE 260 OUTPUT VOLTAGE (mV) 160 140 120 100 SOURCING 100mA 4.0 3.5 3.0 240 VDD - VDL 220 2.5 200 180 VBST - VDH 0.5 100 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 AMBIENT TEMPERATURE (°C) AMBIENT TEMPERATURE (°C) VDH OR VDH (V) DH OR DL OUTPUT RISE TIME vs. TEMPERATURE DH OR DL OUTPUT FALL TIME vs. TEMPERATURE DH OR DL RISING PROPAGATION DELAY vs.
PAGE 7
125V/3A, High-Speed, Half-Bridge MOSFET Drivers RESPONSE TO VDD GLITCH DELAY MATCHING (DH AND DL RISING) MAX15018 toc19 MAX15018 toc18 VIN_ 10V/div 10V/div VDH_ 10V/div VDL VDH AND VDL 10V/div CL = 0pF 10V/div VDD 10V/div VIN_ 40µs/div 10ns/div Pin Description PIN NAME FUNCTION 1 VDD Input Supply Voltage. Valid supply voltage ranges from 8V to 12.6V. Bypass VDD to GND with a parallel combination of 0.1µF and 1µF ceramic capacitors as close to the IC as possible.
PAGE 8
MAX15018/MAX15019 125V/3A, High-Speed, Half-Bridge MOSFET Drivers Detailed Description The MAX15018A/MAX15018B/MAX15019A/MAX15019B half-bridge, n-channel MOSFET drivers control highand low-side MOSFETs in high-voltage, high peak-current applications and offer a high 125V voltage range that allows ample margin above the 100V transient specification of telecom standards. These drivers operate with an IC supply voltage of 8V to 12.6V, and consume only 2.
PAGE 9
125V/3A, High-Speed, Half-Bridge MOSFET Drivers Propagation delay from the logic inputs to the driver outputs is matched to within 8ns (max) between the low-side and high-side drivers. Turn-on and turn-off propagation delays are typically 35ns and 36ns. See Figure 1. The internal drivers also contain break-beforemake logic to eliminate shoot-through conditions that would cause unnecessarily high operating supply currents, efficiency reduction, and voltage spikes at VDD.
PAGE 10
MAX15018/MAX15019 125V/3A, High-Speed, Half-Bridge MOSFET Drivers Bootstrap Capacitor The bootstrap capacitor is used to ensure adequate charge is available to switch the high-side MOSFET. This capacitor is charged from VDD through the internal bootstrap diode when the low-side MOSFET is on. The bootstrap capacitor value should be selected carefully to avoid oscillations during turn-on and turn-off at the DH output.
PAGE 11
125V/3A, High-Speed, Half-Bridge MOSFET Drivers • There are two AC current loops formed between the IC and the gate of the MOSFET being driven. The MOSFET looks like a large capacitance from gate to source when the gate is being pulled low. The active current loop is from the MOSFET driver output (DL or DH) to the MOSFET gate, to the MOSFET source, and to the return terminal of the MOSFET driver (either GND or HS).
PAGE 12
5V/3A, High-Speed, Half-Bridge MOSFET Drivers MAX15018/MAX15019 Typical Application Circuits (continued) VDD = 8V TO 12.6V VIN = 0 TO 125V BST VDD DH N HS IN_H VOUT MAX15018A MAX15019A PWM IN_L DL N GND Figure 3.
PAGE 13
125V/3A, High-Speed, Half-Bridge MOSFET Drivers MAX15018A MAX15018B MAX15019A VDD/2 CMOS VDD/2 CMOS TTL DH IN_H IN_L BST DH IN_H DH IN_H DH IN_H TTL BST BST BST MAX15019B HS HS HS HS VDD VDD VDD VDD DL IN_L IN_L DL SO-EP DL GND GND GND GND IN_L DL SO-EP SO-EP SO-EP Selector Guide HIGH-SIDE DRIVER LOW-SIDE DRIVER LOGIC LEVEL PIN COMPATIBLE MAX15018AASA+ PART Noninverting Noninverting CMOS (VDD/2) HIP 2100IB MAX15018BASA+ Noninverting Inverting CMOS (VDD/
PAGE 14
MAX15018/MAX15019 125V/3A, High-Speed, Half-Bridge MOSFET Drivers Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 5/08 Initial release — 1 9/08 Removed future product asterisk for the MAX15018B. 1 DESCRIPTION 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.