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MAX17558
EVALUATION KIT AVAILABLE
60V, Dual-Output, Synchronous
Step-Down Controller
General Description
The MAX17558 is a dual-output, synchronous step-down
controller that drives nMOSFETs.
The device features a peak-current-mode, constant-
frequency architecture, allowing it to operate up to
2.2MHz. The device can be configured as two single-
phase, independent 10A power supplies or as a dual-
phase, single-output 20A power supply. The device also
provides the ability to run two controllers 180° out-of-
phase to reduce the power loss and noise due to the
input-capacitor ESR.
The IC supports current sensing using either an external
current-sense resistor for accuracy or an inductor DCR
for improved system efficiency. Current foldback limits
MOSFET power dissipation under short-circuit conditions.
The IC provides independent adjustable soft-start for
each output and can start up monotonically into a
prebiased output. The IC can be configured in either
PWM or DCM modes of operation, depending on whether
constant-frequency operation or light-load efficiency is
desired.
The IC operates over the -40°C to +125°C temperature
range and is available in a lead(Pb)-free, 32-pin TQFN,
5mm x 5mm package with an exposed pad.
Applications
● Industrial Power Supplies
● Distributed DC Power Systems
● Motion Control
● Programmable Logic Controllers
● Computerized Numerical Control
Benefits and Features
● Wide Range of Operation
• Wide 4.5V to 60V Input Voltage Range
• Wide 0.8V to 24V Output Voltage Range
• RSENSE or Inductor DCR Current Sensing
• Selectable In-Phase or 180° Out-of-Phase
Operation
• Adjustable 100kHz to 2.2MHz Switching Frequency
• Independent Enable and PGOOD
• Available in a Lead(Pb)-Free 32-Pin, 5mm x 5mm
TQFN-EP Package
● Enhances Power Efficiency
• Low-Impedance Gate Drives for High Efficiency
• DCM Operation at Light Loads
• Auxiliary Bootstrap LDO
● Operates Reliably in Adverse Industrial Environments
• Independent Adjustable Soft-Start or Tracking
• Current Foldback Limits MOSFET Heat Dissipation
During a Short-Circuit Condition
• Operates Over the -40°C to +125°C Temperature
Range
• Output Overvoltage and Overtemperature Protections
Ordering Information appears at end of data sheet.
19-7532; Rev 1; 3/16

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MAX17558
Block Diagram
PGOOD 1 27
PGOOD 2 14
RT 2
SKIP 5
10µA
0.8
8V
VFB1
0.72V
0.88V
VFB
2
0.72V
100 K
SEL_PH
3
OSC
TEST
4
CLK 2
CLK 1
ILIM 28
CURRENT
LIMIT
IN 22
VCCEXT 20
4.7V
LDO
EN
LDO
EN
6
GND
19
VCCINT
60V, Dual-Output, Synchronous
Step-Down Controller
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
SQ
RQ
SKIP
CONTROL
LOGIC
VCCINT
21
BST_
24,17
DH_
26,15
LX_
25,16
DL_
23,18
PGND
ZX
SLOPE
COMP
EA 0.80V
SS_
CS_+
32,10
CS_-
1,9
FB_
31,11
1.8µA
COMP _
30,12
5µA
SS_
1.5V 29,13
EN_
7,8
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Maxim Integrated 2

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MAX17558
60V, Dual-Output, Synchronous
Step-Down Controller
Absolute Maximum Ratings
IN to GND...............................................................-0.3V to +70V
CS_+ to GND.........................................................-0.3V to +40V
CS_+ to CS_-........................................................-0.3V to +0.3V
LX_, BST_ to PGND..............................................-0.3V to +70V
BST_ to LX_.............................................................-0.3V to +6V
BST_ to VCCINT.....................................................-0.3V to +70V
DH_ to LX_.............................................-0.3V to (VBST_ + 0.3)V
DL_ to PGND....................................... -0.3V to (VCCINT + 0.3)V
EN_ to GND.............................................................-0.3V to +6V
VCCINT to GND........................................................-0.3V to +6V
VCCEXT to GND.....................................................-0.3V to +26V
PGND to GND.......................................................-0.3V to +0.3V
PGOOD_ to GND.....................................................-0.3V to +6V
FB_, COMP_, SS_, RT, SKIP, SEL_PH,
ILIM................................................... -0.3V to (VCCINT + 0.3)V
GND to EP.............................................................-0.3V to +0.3V
Continuous Power Dissipation at +70°C
(multilayer board).....................................................2758.6mW
Power Deration (multilayer board)............................34.5 mW/°C
Operating Temperature Range.......................... -40°C to +125°C
Maximum Junction Temperature......................................+150°C
Storage Temperature Range............................. -65°C to +160°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.
Package Thermal Characteristics (Note 1)
Junction-to-Ambient Thermal Resistance (θJA)...............29°C/W
Junction-to-Case Thermal Resistance (θJC)...................1.7°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VIN = 24V, RT = open, CVCCINT = 4.7µF, EN_ = open, DH_, DL_ = open, TJ = -40°C to +125°C, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 2)
PARAMETER
INPUT SUPPLY
Input Voltage Range
Operating Supply Current
(Note 3)
Shutdown Supply Current
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VIN VCCINT = VIN
4.5 60
4.5 5.5
SKIP = open, LX_ = PGND, BST_ = 5V
EN1 = open, EN2 = GND, VFB1 = 0.84V or 0.5 1.5 2.0
EN2 = open, EN1 = GND, VFB2 = 0.84V
SKIP = open, LX_ = PGND, BST_ = 5V
IIN EN1 = EN2 = open, VFB1 = VFB1 = 0.84V
1 2.5 3.5
SKIP = VCCINT, LX_ = PGND, BST_ = 5V
EN1 = open, EN2 = GND, VFB1 = 0.76V or 1 1.8 3.5
EN2 = open, EN1 = GND, VFB2 = 0.76V
SKIP = VCCINT, LX_ = PGND,BST_=5V
EN1 = EN2 = open, VFB1 = VFB1 = 0.76V
1.5 3.2
5
EN1 = EN2 = GND
10 20
V
mA
mA
µA
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Maxim Integrated 3

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MAX17558
60V, Dual-Output, Synchronous
Step-Down Controller
Electrical Characteristics (continued)
(VIN = 24V, RT = open, CVCCINT = 4.7µF, EN_ = open, DH_, DL_ = open, TJ = -40°C to +125°C, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 2)
PARAMETER
VCCINT REGULATOR
VCCINT Output Voltage
VCCINT Load Regulation
VCCINT Short-Circuit Output
Current
VCCINT Dropout Voltage
VCCEXT Switch Overvoltage
VCCEXT Switch Overvoltage
Hysteresis
VCCINT UVLO
OSCILLATOR
Switching Frequency
RT Pullup Current
Switching Frequency
Adjustable Range
SKIP
DCM Mode Setting Range
PWM Mode Setting Range
SKIP Pulldown Resistance
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VCCINT
6V < VIN < 60V, IVCCINT = 1mA
6V < VCCEXT < 24V, IVCCINT = 1mA
(VCCINT supplied from VCCEXT)
VIN = 12V, I = 0mA to 100mA, VCCEXT =
0V (VCCINT supplied from VIN)
VVCCEXT = 12V, IVCCINT = 0mA to 100mA
(VCCINT supplied from VCCEXT)
VIN = 8.5V, VCCEXT = 0V, VCCINT = 4V
VCCEXT = 8.5V, VCCINT = 4V
(VCCINT supplied from VCCEXT)
VIN = 4.5V, load = 75mA, VCCEXT = 0
VCCINT supplied from VCCEXT, VIN = 24V,
VCCEXT = 4.7V, load = 75mA
VCCEXT rising
VCCINT rising
VCCINT falling
4.95 5.1 5.25
4.95 5.1 5.25
5 25 50
5 25 50
120 250 340
120 250 340
50 150 420
50 150 420
4.55 4.7 4.85
0.2 0.25 0.3
4 4.2 4.4
3.5 3.7 3.9
RT = 62kΩ
fSW RT = VCCINT
RT = GND
VRT = 0.5V
fSW 26.5kΩ < RT < 280kΩ
405 440 475
480 535 590
325 350 375
9.5 10 10.5
100 2200
V
mV
mA
mV
V
V
V
kHz
µA
kHz
1.25
VCCINT
-1.6
VCCINT
- 1.5
VCCINT
70 100 130
V
V
kΩ
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Maxim Integrated 4

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MAX17558
60V, Dual-Output, Synchronous
Step-Down Controller
Electrical Characteristics (continued)
(VIN = 24V, RT = open, CVCCINT = 4.7µF, EN_ = open, DH_, DL_ = open, TJ = -40°C to +125°C, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 2)
PARAMETER
GATE DRIVER
DH_ to BST_ On-Resistance
DH_ to LX_ On-Resistance
DL_ to VCCINT On-Resistance
DL_ to PGND_ On-Resistance
SYMBOL
CONDITIONS
Sourcing 100mA
Sinking 100mA
Sourcing 100mA
Sinking 100mA
MIN TYP MAX UNITS
0.7
0.25
0.7
1.3
0.5
1.3
2.5
0.9
2.5
0.35 0.75 1.25
DH_ Minimum Controlled
On-Time
DL_ Minimum Controlled
Off-Time
Dead Time
DH_ Transition Time
tON_MIN
tOFF_MIN
tDT
DL_ Transition Time
SOFT-START
Soft-Start Current
ENABLE
EN_ Logic-High Threshold
EN_ Hysteresis
EN_ Bias Pullup Bias Current
CURRENT-SENSE AMPLIFIER
CS_+ , CS_- Common-Mode
Voltage Range
CS_+ to CS_- Input Operating
Voltage Range
ISS
VCS_+ -
VCS_-
Current-Sense Amplifier Gain
CS_+ Input Bias Current
CS_- Input Bias Current
PWM mode, VFB_ = 0.84V
DH_ falling to DL_ rising, CLOAD = 6nF
DL_ falling to DH_ rising, CLOAD = 6nF
DH_ rising, CLOAD = 6nF
DH_ falling, CLOAD = 6nF
DL_ rising, CLOAD = 6nF
DL_ falling, CLOAD = 6nF
VSS = 0.5V
EN_ rising
VEN_ = 0.5V
0 < VCS_- < 24V
ILIM = GND
ILIM = open
VILIM = VCCINT
0 < VCS_- < 24V, TA = TJ = +25°C
VCS_+ = VCS_- = 1.2V or 24V
120 155
80 120 160
30
30
25
15
25
15
3.5 5 6.5
1.2 1.25 1.3
90
0.9 1.8 2.7
ns
ns
ns
ns
ns
µA
V
mV
µA
0 24
-100
+100
30 33.3 36.6
18 20 22
12 13.3 14.5
0.01 1
5 600
V
mV
V/V
µA
µA
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Maxim Integrated 5