MAXIM MAX5042, MAX5043 User Manual

现货库存、技术资料、百科信息、热点资讯，精彩尽在鼎好!

General Description

The MAX5042/MAX5043 isolated multimode PWM power ICs feature integrated switching power MOSFETs connected in a voltage-clamped, two-transistor, power-circuit configuration. These devices operate from a wide 20V to 76V input voltage range. The MAX5042 includes a hotswap controller for use with an external power MOSFET to limit inrush current for applications where the power supply is plugged into a live power backplane. The MAX5043 does not include a hot-swap controller.

The voltage-clamped power topology of the MAX5042/ MAX5043 enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. Operating at up to 500kHz switching frequency, these devices provide up to 50W of output power. The MAX5042/MAX5043 allow the implementation of both forward and flyback voltage or current-mode converter topologies. A dedicated latched external shutdown provides protection in addition to internal thermal shutdown.

The MAX5042/MAX5043 achieve higher efficiency when used with secondary-side synchronous rectification. These devices generate a look-ahead signal for driving secondary-side synchronous rectifiers.

The MAX5042/MAX5043 are rated for operation over the

-40°C to +125°C and -40°C to +85°C temperature range, respectively, and are available in a small surfacemount 56-pin thin QFN package.

Warning: The MAX5042/MAX5043 are designed to work with high voltages. Exercise caution.

Applications

High-Efficiency Telecom/Datacom Power Supplies

Router/Switch Cards with 48V Backplane Power Systems

Servers with 48V Backplane Power Systems

xDSL Line Cards

xDSL Line-Driver Power Supplies

Distributed Power Systems with 48V Bus

42V Automotive Power Supplies

Power-Supply Modules

Features

♦ Reliable Single-Stage Clamped Two-Switch Power

ICs for High Efficiency

♦ No Reset Winding Required

♦ Up to 50W Output Power ♦ Integrated High-Voltage 75mΩ Power MOSFETs

♦ 20V to 76V Wide Input Voltage Range

♦ Feed-Forward Voltage or Current-Mode Control

♦ Programmable Brownout Undervoltage Lockout

♦ Integrated Current Signal Amplifier for High-

Efficiency, Current-Mode Control

♦ Internal Overtemperature Shutdown

♦ Indefinite Short-Circuit Protection

♦ Integrated Thermally Protected High-Voltage

Startup Linear Regulator

♦ Integrated Hot-Swap Controller (MAX5042)

♦ Integrated Look-Ahead Signal Output Drives

High-Speed Optocoupler for Secondary-Side Synchronous Rectification

♦ >90% Efficiency with Synchronous Rectification

♦ Up to 500kHz Switching Frequency

♦ High-Power, Small-Footprint 56-Pin Thermally

Enhanced QFN Package

MAX5042/MAX5043

Two-Switch Power ICs with Integrated

Power MOSFETs and Hot-Swap Controller

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3046; Rev 2; 6/04

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.

Pin Configurations appear at end of data sheet.

Selector Guide

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX5042ATN -40°C to +125°C 56 Thin QFN

MAX5043ETN -40°C to +85°C 56 Thin QFN

PART DESCRIPTION

Two-Switch Power IC with Integrated Power

MAX5042

MAX5043

MOSFETs and Hot-Swap Controller for Isolated Power Supplies

Two-Switch Power IC with Integrated Power MOSFETs for Isolated Power Supplies

MAX5042/MAX5043

Two-Switch Power ICs with Integrated Power MOSFETs and Hot-Swap Controller

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

PWMNEG, POSINPWM, DRNH,

XFRMRH, XFRMRL, SRC to NEGIN....................-0.3V to +80V

BST to NEGIN.........................................................-0.3V to +95V

BST to XFRMRH .....................................................-0.3V to +12V

SRC to PWMNEG .....................................................-0.3V to +6V

REG15 to PWMNEG ...............................................-0.3V to +40V

REG15 to POSINPWM ............................................-80V to +0.3V

REG9, DRVIN to PWMNEG ....................................-0.3V to +12V

REG5 to PWMNEG ...................................................-0.3V to +6V

REG15 Current..................................................................±80mA

REG9 Current......................................................................40mA

REG5 Current......................................................................20mA

UVLO, RAMP, CSS, FLTINT, CSOUT,

RCFF, RCOSC to PWMNEG ...............................-0.3V to +12V

OPTO, PWMSD, SYNC, CSP, CSN,

DRVDEL to PWMNEG...........................................-0.3V to +6V

PPWM to PWMNEG .................................-0.3V to (REG5 + 0.3V)

PPWM Current .................................................................±20mA

PWMPNEG to PWMNEG .......................................-0.3V to +0.3V

DRNH Continuous Average Current (all pins combined)

= +125°C.........................................................................2A

= +150°C......................................................................1.4A

XFRMRH Continuous Average Current (all pins combined)

= +125°C.........................................................................2A

= +150°C......................................................................1.4A

XFRMRL Continuous Average Current (all pins combined)

= +125°C.........................................................................2A

= +150°C......................................................................1.4A

SRC Continuous Current (all pins combined)

= +125°C.........................................................................2A

= +150°C......................................................................1.4A

POSINHS to NEGIN................................................-0.3V to +80V

HSEN to NEGIN........................................................-0.3V to +4V

DEN to PWMNEG .....................................................-0.3V to +4V

HSGATE to NEGIN .................................................-0.3V to +12V

HSDRAIN, HSOK to NEGIN....................................-0.3V to +80V

HSOK Current .....................................................................20mA

Continuous Power Dissipation (T

= +70°C)

56-Pin Thin QFN (derate 47.6mW/°C above +70°C) .......3.8W

Junction to Ambient Thermal Resistance, θ

...............+21°C/W

Operating Temperature Range

MAX5042ATN ................................................-40°C to +125°C

MAX5043ETN ..................................................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

(See the Absolute Maximum Ratings Diagram below to better understand the absolute maximum ratings of the various blocks.)

IC SUBSTRATE, NEGIN

PWMNEG, PWMPNEG, HSDRAIN, HSOK

POSINHS, POSINPWM

REG15

REG9, UVLO, RAMP, CSS, FLTINT, CSOUT, RCFF, RCOSC, DRVIN

REG5, OPTO, PWMSD, SYNC, CSP, CSN, DRVDEL, SRC, PPWM

HSEN

HSGATE

XFRMRL

XFRMRH, DRNH

BST

DEN

80V

40V

12V

80V

12V

80V

95V

Absolute Maximum Ratings Diagram

_______________________________________________________________________________________ 3

MAX5042/MAX5043

Two-Switch Power ICs with Integrated

Power MOSFETs and Hot-Swap Controller

ELECTRICAL CHARACTERISTICS

POSINPWM

= 20V to 76V, V

REG15

= 18V, C

REG15

= 4.7µF, C

REG9

= 1µF, C

REG5

= 1µF, R

RCOSC

= 24kΩ, C

RCOSC

= 100pF, C

BST

0.22µF, R

DRVDEL

= 10kΩ, C

DRVDEL

= 0.22µF, V

CSS

= V

CSP

= V

CSN

= V

RAMP

= V

PWMNEG

= V

NEGIN

= 0, TA= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at V

POSINPWM

= 48V, TA= +25°C, unless otherwise noted. All voltages are referred to PWMNEG,

unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Range

20 76 V

REG15 REGULATOR

REG15 Output Voltage Range

POSINPWM

= 20V to 76V

REG15 Output Voltage Load Regulation

POSINPWM

= 20V, I

REG15

= 0 to 80mA 1.5 V

REG15 Output Current Inferred from load regulation test 80 mA REG15 Current Limit REG15 shorted to PWMNEG with 10Ω

REG15 Overdrive Voltage 18 40 V

REG9 REGULATOR

REG9 Output Voltage Range V

REG15

= 18V to 40V 8.3

REG9 Output Voltage Load Regulation

REG9

= 0 to 40mA

REG9 Output Current Inferred from load regulation test 40 mA REG9 Current Limit REG9 shorted to PWMNEG with 10Ω

REG5 REGULATOR

REG5 Output Voltage Range V

REG15

= 18V to 40V 4.5 5.5 V

REG5 Output Voltage Load Regulation

REG5

= 0 to 20mA

REG5 Output Current Inferred from load regulation test 20 mA REG5 Current Limit REG5 shorted to PWMNEG with 10Ω 40 mA

PWM COMPARATOR

Common-Mode Range

0 5.5 V

Input Offset Voltage 10 mV

Input Bias Current

µA

Propagation Delay 50mV overdrive, 0 ≤ V

CM-PWM

≤ 5.5V 70 ns

RCOSC OSCILLATOR

PWM Period

3.9 µs

Maximum Duty Cycle 47 %

Maximum RCOSC Frequency f

RCOSC

1.2

MHz

RCOSC Peak Trip Level V

RCOSC Valley Trip Level 0.2 V

RCOSC Input Bias Current

µA

RCOSC Discharge MOSFET R

DS(ON)

Sinking 10mA 60

Ω

RCOSC Discharge Pulse Width 50 ns

SYNC High Level 3.5 V

SYNC Low Level 0.8 V

POSINPWM

REG15

13.0 16.6

140

100

CM-PWM

OSC-PWM

-2.5 +2.5

2.55

-0.3

10.1

0.35

120

MAX5042/MAX5043

Two-Switch Power ICs with Integrated Power MOSFETs and Hot-Swap Controller

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

POSINPWM

= 20V to 76V, V

REG15

= 18V, C

REG15

= 4.7µF, C

REG9

= 1µF, C

REG5

= 1µF, R

RCOSC

= 24kΩ, C

RCOSC

= 100pF, C

BST

0.22µF, R

DRVDEL

= 10kΩ, C

DRVDEL

= 0.22µF, V

CSS

= V

CSP

= V

CSN

= V

RAMP

= V

PWMNEG

= V

NEGIN

= 0, TA= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at V

POSINPWM

= 48V, TA= +25°C, unless otherwise noted. All voltages are referred to PWMNEG,

unless otherwise noted.)

SYNC Leakage Current ±1 µA

SYNC Maximum Frequency f

SYNC On-Time 50 ns

SYNC Off-Time 200 ns

PWM LOGIC

PWM Comparator Propagation Delay

PPWM to XFRMRL Delay PPWM rising 120 ns

DRVDEL Reference Voltage 1.14 1.38 V

PPWM Output High Sourcing 2mA 2.8 V

PPWM Output Low Sinking 2mA 0.4 V

PWMSD Logic High 3.5 V PWMSD Logic Low 0.8 V PWMSD Leakage Current ±1 µA

SOFT-START

Soft-Start Current I

Minimum OPTO Voltage CSS = 0, sinking 2mA 1.4 V

RAMP GENERATOR

Minimum RCFF Voltage RCFF sinking 2mA 2.1 V

RCFF Leakage ±0.1 ±1 µA

OVERLOAD FAULT

FLTINT Pulse Current I

FLTINT Trip Point 2.0 2.7 3.5 V

FLTINT Hysteresis 0.75 V

INTERNAL POWER FETs

On-Resistance R

Off-State Leakage Current 10 µA

Total Gate Charge Per FET Inferred from supply current with V

HIGH-SIDE DRIVER

Low-to-High Latency

High-to-Low Latency

Output Drive Voltage BST to XFRMRH with high side on 8 V

LOW-SIDE DRIVER

Low-to-High Latency

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SYNC

2.4 MHz

70 ns

CSS

FLTINT

DSON

= V

D R V I N

= 190mA

BS T

= 9V , V

Driver delay until FET V

- V

BST

XFRMRH

)

Driver delay until FET V

- V

BST

XFRMRH

)

Driver delay until FET V V

DRVIN

= V

X F RM RH

reaches 0.9 x

reaches 0.1 x

reaches 0.9 x

= 0,

S R C

= 50V 45 nC

D S

33 µA

80 µA

75 200 mΩ

80 ns

45 ns

80 ns

MAX5042/MAX5043

Two-Switch Power ICs with Integrated

Power MOSFETs and Hot-Swap Controller

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

POSINPWM

= 20V to 76V, V

REG15

= 18V, C

REG15

= 4.7µF, C

REG9

= 1µF, C

REG5

= 1µF, R

RCOSC

= 24kΩ, C

RCOSC

= 100pF, C

BST

0.22µF, R

DRVDEL

= 10kΩ, C

DRVDEL

= 0.22µF, V

CSS

= V

CSP

= V

CSN

= V

RAMP

= V

PWMNEG

= V

NEGIN

= 0, TA= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at V

POSINPWM

= 48V, TA= +25°C, unless otherwise noted. All voltages are referred to PWMNEG,

unless otherwise noted.)

High-to-Low Latency

CURRENT-SENSE COMPARATOR

Current-Limit-Comparator Threshold Voltage

Current-Limit-Comparator Propagation Delay

CURRENT-SENSE AMPLIFIER

Current Amplifier Gain V

Input Voltage Offset VCN = V

Input Common-Mode Range -0.3 +0.3 V

Input Differential-Mode Range Inferred from current amplifier gain test 0.35 V

CSP Input Bias Current V

CSN Input Bias Current V

Settling Time

3dB Bandwidth 7MHz

BOOST VOLTAGE CIRCUIT

QB R

Driver Output Delay 200

One-Shot Pulse Width 300 ns

THERMAL SHUTDOWN

Shutdown Temperature Temperature rising 150 °C

Thermal Hysteresis 14.5 °C

PWM CONVERTER UNDERVOLTAGE LOCKOUT (UVLO)

Preset UVLO Threshold Measured at POSINPWM rising 28 31 34 V

UVLO Threshold Hysteresis 3V UVLO Resistance Looking into UVLO 30 75 kΩ

UVLO Trip Point Measured at UVLO rising 1.15 1.27 1.39 V

UVLO Hysteresis +127 mV

Preset DEN Threshold

DEN Threshold Hysteresis MAX5043 only 3.1 V

DEN Startup Delay MAX5043 only 3.5 12 27.0 ms

DEN Turn-Off Delay MAX5043 only 0.2 0.7 1.5 ms

DEN Trip Point

DS(ON)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Driver delay until FET V

0.1 x V

DRVIN

10mV overdrive 40 ns

= 0, V

CSN

= -0.3V to +0.3V, V

CSP

= -0.3V to +0.3V, V

CSP

= 0, V

CSN

settling time, C

Sinking 100mA 10 20 Ω

MAX5043 only, measured at POSINPWM rising

MAX5043 only, rising with respect to PWMNEG

= 0 to 0.35V 9.75 10 10.25 V/V

CSP

= -0.3V to +0.3V 185 200 230 mV

CSP

steps from 0 to 0.2V, 10%

CSP

= 20pF

reaches

140 156 172 mV

= 0 -160 -40 µA

CSN

= 0 -160 -30 µA

CSN

27 34 V

1.11 1.35 V

45 ns

70 ns

MAX5042/MAX5043

Two-Switch Power ICs with Integrated Power MOSFETs and Hot-Swap Controller

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

POSINPWM

= 20V to 76V, V

REG15

= 18V, C

REG15

= 4.7µF, C

REG9

= 1µF, C

REG5

= 1µF, R

RCOSC

= 24kΩ, C

RCOSC

= 100pF, C

BST

0.22µF, R

DRVDEL

= 10kΩ, C

DRVDEL

= 0.22µF, V

CSS

= V

CSP

= V

CSN

= V

RAMP

= V

PWMNEG

= V

NEGIN

= 0, TA= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at V

POSINPWM

= 48V, TA= +25°C, unless otherwise noted. All voltages are referred to PWMNEG,

unless otherwise noted.)

DEN Hysteresis MAX5043 only 124 mV DEN Input Resistance MAX5043 only, looking into DEN 18 55 kΩ

SUPPLY CURRENT

Supply Current

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

From V

POSINHS

CSS shorted to PWMNEG, REG15 = 18V

From REG15 = 18V, V V

POSINPWM

PWMNEG

= V

POSINPWM

= 76V, CSS shorted to

POSINHS

= 76V,

6 8.5

= V

POSINPWM

= 76V,

27 34 V

0.6 1 mA

±1 µA

From REG15 = 18V, V V

POSINPWM

Standby Supply Current

HOT-SWAP CONTROLLER (MAX5042 Only)

Hot-Swap UVLO Threshold

Hot-Swap UVLO Hysteresis 3.1 V

Hot-Swap UVLO Resistance Looking into HSEN 18 55 kΩ Startup Delay From HSEN rising to HSOK falling 50 165 350 ms HSEN Turn-Off Delay From HSEN falling to HSOK rising 3 10 25 ms

HSOK Output-High Leakage Current

HSEN Reference Threshold Rising with respect to NEGIN 1.11 1.35 V

HSEN Hysteresis 124 mV HSOK Output Low Voltage Sinking 5mA 0.4 V

HSGATE Voltage High 7.5 10.0 V

Hot-Swap Slew Rate CL = 10µF, from HSDRAIN to NEGIN 10 V/ms

XFRMRL

MAX5042 only, V V

PWMNEG

HSEN = NEGIN

POSINHS with respect to NEGIN, voltage rising

= 76V, V

= V

SRC

= V

POSINHS

DRNH = VXFRMRH

= 0V

POSINHS

PWMPNEG = VHSDRAIN

_______________________________________________________________________________________ 7

MAX5042/MAX5043

Two-Switch Power ICs with Integrated

Power MOSFETs and Hot-Swap Controller

HOT-SWAP UNDERVOLTAGE LOCKOUT

THRESHOLD vs. TEMPERATURE

MAX5042 toc01

TEMPERATURE (°C)

HOT-SWAP UNDERVOLTAGE LOCKOUT THRESHOLD (V)

1007550250-25

-50 125

POSINHS

RISING

POSINHS

FALLING

HOT-SWAP STARTUP DELAY

vs. TEMPERATURE

MAX5042 toc02

TEMPERATURE (°C)

HOT-SWAP STARTUP DELAY (ms)

1007550250-25

155

160

165

170

175

150

-50 125

HOT-SWAP GATE VOLTAGE

vs. INPUT VOLTAGE

MAX5042 toc03

INPUT VOLTAGE (V)

HOT-SWAP GATE VOLTAGE (V)

7060504030

8.70

8.71

8.72

8.73

8.69 20 80

HOT-SWAP STARTUP WAVEFORM

MAX5042 toc04

HSGATE

5V/div

10ms/div

HSDRAIN

20V/div

HSOK

20V/div

100kΩ PULLUP

PWM UNDERVOLTAGE LOCKOUT

THRESHOLD vs. TEMPERATURE

MAX5042 toc05

TEMPERATURE (°C)

PWM UVLO THRESHOLD (V)

1007550250-25

-50 125

POSINPWM

RISING

POSINPWM

FALLING

POSINPWM INPUT CURRENT, REG15

INPUT CURRENT vs. TEMPERATURE

MAX5042 toc06

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

10075-25 0 25 50

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

2.0

-50 125

REG15

, V

POSINPWM

= 76V

POSINPWM

, V

POSINPWM

= 76V

REG15

= 18V, CSS = 0,

XFRMRH = 0, NO SWITCHING

POSINPWM INPUT CURRENT, REG15 INPUT CURRENT vs. INPUT VOLTAGE

MAX5042 toc07

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

7060504030

20 80

REG15

POSINPWM

REG15

= 18V, CSS = 0,

XFRMRH = 0, NO SWITCHING

OPERATING FREQUENCY

vs. TEMPERATURE

MAX5042 toc08

TEMPERATURE (°C)

OPERATING FREQUENCY (kHz)

1007550250-25

250

270

290

310

330

350

230

-50 125

RCOSC

= 25kΩ, C

RCOSC

= 100pF

RCOSC

= 19kΩ, C

RCOSC

= 100pF

Typical Operating Characteristics

POSINPWM

= 20V, TA = +25°C, unless otherwise noted.)

+ 15 hidden pages