19-3046; Rev 2; 6/04
KIT
ATION
EVALU
BLE
AVAILA
Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
General Description
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
The MAX5042/MAX5043 isolated multimode PWM power
ICs feature integrated switching power MOSFETs con-
nected 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 hot-
swap controller for use with an external power MOSFET to
limit inrush current for applications where the power sup-
ply 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 fre-
quency, these devices provide up to 50W of output
power. The MAX5042/MAX5043 allow the implementa-
tion of both forward and flyback voltage or current-mode
converter topologies. A dedicated latched external shut-
down 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 surface-
mount 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
MAX5042
PART
PART
MAX5042ATN
MAX5043ETN
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +85°C
PIN-PACKAGE
56 Thin QFN
56 Thin QFN
Selector Guide
DESCRIPTION
Two-Switch Power IC with Integrated Power
MOSFETs and Hot-Swap Controller for Isolated
Power Supplies
Two-Switch Power IC with Integrated Power
MOSFETs for Isolated Power Supplies
MAX5043
Pin Configurations appear at end of data sheet.
________________________________________________________________
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.
Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
MAX5042/MAX5043
ABSOLUTE MAXIMUM RATINGS
(See the
Absolute Maximum Ratings Diagram
below to better understand the absolute maximum ratings of the various blocks.)
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)
T
J
= +125°C.........................................................................2A
T
J
= +150°C......................................................................1.4A
XFRMRH Continuous Average Current (all pins combined)
T
J
= +125°C.........................................................................2A
T
J
= +150°C......................................................................1.4A
XFRMRL Continuous Average Current (all pins combined)
T
J
= +125°C.........................................................................2A
T
J
= +150°C......................................................................1.4A
SRC Continuous Current (all pins combined)
T
J
= +125°C.........................................................................2A
T
J
= +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
A
= +70°C)
56-Pin Thin QFN (derate 47.6mW/°C above +70°C) .......3.8W
Junction to Ambient Thermal Resistance,
θ
JA
...............+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
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.
Absolute Maximum Ratings Diagram
POSINHS,
POSINPWM
BST
12V
XFRMRH, DRNH
XFRMRL
REG15
80V
80V
80V
40V
12V
6V
4V
DEN
PWMNEG,
PWMPNEG,
HSDRAIN,
HSOK
HSGATE
HSEN
4V
IC SUBSTRATE, NEGIN
80V
REG5, OPTO, PWMSD, SYNC, CSP,
CSN, DRVDEL, SRC, PPWM
80V
95V
REG9, UVLO, RAMP, CSS, FLTINT,
CSOUT, RCFF, RCOSC, DRVIN
80V
12V
2
_______________________________________________________________________________________
Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
ELECTRICAL CHARACTERISTICS
(V
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, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at V
POSINPWM
= 48V, T
A
= +25°C, unless otherwise noted. All voltages are referred to PWMNEG,
unless otherwise noted.)
PARAMETER
Input Supply Range
REG15 REGULATOR
REG15 Output Voltage Range
REG15 Output Voltage Load
Regulation
REG15 Output Current
REG15 Current Limit
REG15 Overdrive Voltage
REG9 REGULATOR
REG9 Output Voltage Range
REG9 Output Voltage Load
Regulation
REG9 Output Current
REG9 Current Limit
REG5 REGULATOR
REG5 Output Voltage Range
REG5 Output Voltage Load
Regulation
REG5 Output Current
REG5 Current Limit
PWM COMPARATOR
Common-Mode Range
Input Offset Voltage
Input Bias Current
Propagation Delay
RCOSC OSCILLATOR
PWM Period
Maximum Duty Cycle
Maximum RCOSC Frequency
RCOSC Peak Trip Level
RCOSC Valley Trip Level
RCOSC Input Bias Current
RCOSC Discharge MOSFET
R
DS(ON)
RCOSC Discharge Pulse Width
SYNC High Level
SYNC Low Level
3.5
0.8
Sinking 10mA
f
RCOSC
V
TH
t
OSC-PWM
3.9
47
1.2
2.55
0.2
-0.3
60
50
120
µs
%
MHz
V
V
µA
Ω
ns
V
V
50mV overdrive, 0
≤
V
CM-PWM
≤
5.5V
-2.5
70
V
CM-PWM
0
10
+2.5
5.5
V
mV
µA
ns
V
REG15
= 18V to 40V
I
REG5
= 0 to 20mA
Inferred from load regulation test
REG5 shorted to PWMNEG with 10Ω
40
4.5
5.5
0.35
20
V
V
mA
mA
V
REG15
= 18V to 40V
I
REG9
= 0 to 40mA
Inferred from load regulation test
REG9 shorted to PWMNEG with 10Ω
100
8.3
10.1
0.35
40
V
V
mA
mA
V
REG15
V
POSINPWM
= 20V to 76V
V
POSINPWM
= 20V, I
REG15
= 0 to 80mA
Inferred from load regulation test
REG15 shorted to PWMNEG with 10Ω
18
140
40
13.0
16.6
1.5
80
V
V
mA
mA
V
SYMBOL
V
POSINPWM
CONDITIONS
MIN
20
TYP
MAX
76
UNITS
V
MAX5042/MAX5043
_______________________________________________________________________________________
3
Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
MAX5042/MAX5043
ELECTRICAL CHARACTERISTICS (continued)
(V
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, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at V
POSINPWM
= 48V, T
A
= +25°C, unless otherwise noted. All voltages are referred to PWMNEG,
unless otherwise noted.)
PARAMETER
SYNC Leakage Current
SYNC Maximum Frequency
SYNC On-Time
SYNC Off-Time
PWM LOGIC
PWM Comparator Propagation
Delay
PPWM to XFRMRL Delay
DRVDEL Reference Voltage
PPWM Output High
PPWM Output Low
PWMSD
Logic High
PWMSD
Logic Low
PWMSD
Leakage Current
SOFT-START
Soft-Start Current
Minimum OPTO Voltage
RAMP GENERATOR
Minimum RCFF Voltage
RCFF Leakage
OVERLOAD FAULT
FLTINT Pulse Current
FLTINT Trip Point
FLTINT Hysteresis
INTERNAL POWER FETs
On-Resistance
Off-State Leakage Current
Total Gate Charge Per FET
HIGH-SIDE DRIVER
Low-to-High Latency
High-to-Low Latency
Output Drive Voltage
LOW-SIDE DRIVER
Low-to-High Latency
Driver delay until FET V
GS
reaches 0.9 x
V
DRVIN
80
ns
Driver delay until FET V
GS
reaches 0.9 x
(V
BST
- V
XFRMRH
)
Driver delay until FET V
GS
reaches 0.1 x
(V
BST
- V
XFRMRH
)
BST to XFRMRH with high side on
80
45
8
ns
ns
V
Inferred from supply current with V
DS
= 50V
45
R
DSON
V
DRVIN
= V
BST
= 9V, V
XFRMRH
= V
SRC
= 0,
I
DS
= 190mA
75
200
10
mΩ
µA
nC
I
FLTINT
2.0
80
2.7
0.75
3.5
µA
V
V
RCFF sinking 2mA
2.1
±0.1
±1
V
µA
I
CSS
CSS = 0, sinking 2mA
33
1.4
µA
V
Sourcing 2mA
Sinking 2mA
3.5
0.8
±1
PPWM rising
1.14
2.8
0.4
70
120
1.38
ns
ns
V
V
V
V
V
µA
f
SYNC
50
200
2.4
SYMBOL
CONDITIONS
MIN
TYP
MAX
±1
UNITS
µA
MHz
ns
ns
4
_______________________________________________________________________________________
Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
ELECTRICAL CHARACTERISTICS (continued)
(V
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, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at V
POSINPWM
= 48V, T
A
= +25°C, unless otherwise noted. All voltages are referred to PWMNEG,
unless otherwise noted.)
PARAMETER
High-to-Low Latency
CURRENT-SENSE COMPARATOR
Current-Limit-Comparator
Threshold Voltage
Current-Limit-Comparator
Propagation Delay
CURRENT-SENSE AMPLIFIER
Current Amplifier Gain
Input Voltage Offset
Input Common-Mode Range
Input Differential-Mode Range
CSP Input Bias Current
CSN Input Bias Current
Settling Time
3dB Bandwidth
BOOST VOLTAGE CIRCUIT
QB R
DS(ON)
Driver Output Delay
One-Shot Pulse Width
THERMAL SHUTDOWN
Shutdown Temperature
Thermal Hysteresis
PWM CONVERTER UNDERVOLTAGE LOCKOUT (UVLO)
Preset UVLO Threshold
UVLO Threshold Hysteresis
UVLO Resistance
UVLO Trip Point
UVLO Hysteresis
Preset DEN Threshold
DEN Threshold Hysteresis
DEN Startup Delay
DEN Turn-Off Delay
DEN Trip Point
MAX5043 only, measured at POSINPWM
rising
MAX5043 only
MAX5043 only
MAX5043 only
MAX5043 only, rising with respect to
PWMNEG
3.5
0.2
1.11
27
3.1
12
0.7
27.0
1.5
1.35
Looking into UVLO
Measured at UVLO rising
30
1.15
1.27
+127
34
Measured at POSINPWM rising
28
31
3
75
1.39
34
V
V
kΩ
V
mV
V
V
ms
ms
V
Temperature rising
150
14.5
°C
°C
Sinking 100mA
10
200
300
20
Ω
ns
ns
Inferred from current amplifier gain test
V
CSP
= -0.3V to +0.3V, V
CSN
= 0
V
CSP
= -0.3V to +0.3V, V
CSN
= 0
V
CSN
= 0, V
CSP
steps from 0 to 0.2V, 10%
settling time, C
L
= 20pF
-160
-160
70
7
V
CSN
= 0, V
CSP
= 0 to 0.35V
V
CN
= V
CSP
= -0.3V to +0.3V
9.75
185
-0.3
10
200
10.25
230
+0.3
0.35
-40
-30
V/V
mV
V
V
µA
µA
ns
MHz
10mV overdrive
140
156
40
172
mV
ns
SYMBOL
CONDITIONS
Driver delay until FET V
GS
reaches
0.1 x V
DRVIN
MIN
TYP
45
MAX
UNITS
ns
MAX5042/MAX5043
_______________________________________________________________________________________
5
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