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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX17558 Datasheet

Step-Down Controller

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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


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX17558 Datasheet

Step-Down Controller

No Preview Available !

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
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX17558
Description Step-Down Controller
Maker Maxim
Total Page 28 Pages
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