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MAX5066EUI+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
General Description
The MAX5066 is a two-phase, configurable single- or
dual-output buck controller with an input voltage range of
4.75V to 5.5V or from 5V to 28V. Each phase of the
MAX5066 is designed for 180° operation. A mode pin
allows for a dual-output supply or connecting two phases
together for a single-output, high-current supply. Each
output channel of the MAX5066 drives n-channel
MOSFETs and is capable of providing more than 25A of
load current. The MAX5066 uses average current-mode
control with a switching frequency up to 1MHz per phase
where each phase is 180° out of phase with respect to
the other. Out-of-phase operation results in significantly
reduced input capacitor ripple current and output volt-
age ripple in dual-phase, single-output voltage applica-
tions. Each buck regulator output has its own high-
performance current and voltage-error amplifier that can
be compensated for optimum output filter L-C values and
transient response.
The MAX5066 offers two enable inputs with accurate
turn-on thresholds to allow for output voltage sequencing
of the two outputs. The device’s switching frequency can
be programmed from 100kHz to 1MHz with an external
resistor. The MAX5066 can be synchronized to an exter-
nal clock. Each output voltage is adjustable from 0.61V to
5.5V. Additional features include thermal shutdown, “hic-
cup mode” short-circuit protection. Use the MAX5066
with adaptive voltage positioning for applications that
require a fast transient response, or accurate output volt-
age regulation.
The MAX5066 is available in a thermally enhanced 28-pin
TSSOP package capable of dissipating 1.9W. The device
is rated for operation over the -40°C to +85°C extended,
or -40°C to +125°C automotive temperature range.
Applications
High-End Desktop Computers
Graphics Cards
Networking Systems
Point-of-Load High-Current/High-Density
Telecom DC-DC Regulators
RAID Systems
Features
♦ 4.75V to 5.5V or 5V to 28V Input
♦ Dual-Output Synchronous Buck Controller
♦ Configurable for Two Separate Outputs or One
Single Output
♦ Each Output is Capable of Up to 25A Output
Current
♦ Average Current-Mode Control Provides Accurate
Current Limit
♦ 180° Interleaved Operation Reduces Size of Input
Filter Capacitors
♦ Limits Reverse Current Sinking When Operated in
Parallel Mode
♦ Each Output is Adjustable from 0.61V to 5.5V
♦ Independently Programmable Adaptive Voltage
Positioning
♦ Independent Shutdown for Each Output
♦ 100kHz to 1MHz per Phase Programmable
Switching Frequency
♦ Oscillator Frequency Synchronization from
200kHz to 2MHz
♦ Hiccup Mode Overcurrent Protection
♦ Overtemperature Shutdown
♦ Thermally Enhanced 28-Pin TSSOP Package
Capable of Dissipating 1.9W
♦ Operates Over -40°C to +85°C or -40°C to +125°C
Temperature Range
MAX5066
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3661; Rev 1; 8/05
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX5066EUI -40°C to +85°C 28 TSSOP-EP*
MAX5066AUI -40°C to +125°C 28 TSSOP-EP*
*Exposed Pad
MAX5066
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
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.
IN to AGND.............................................................-0.3V to +30V
BST_ to AGND........................................................-0.3V to +35V
DH_ to LX_ ....................................-0.3V to (V
BST_
- V
LX_
) + 0.3V
DL_ to PGND..............................................-0.3V to (V
DD
+ 0.3V)
BST_ to LX_ ..............................................................-0.3V to +6V
V
DD
to PGND............................................................-0.3V to +6V
AGND to PGND .....................................................-0.3V to +0.3V
REG, RT/CLKIN, CSP_, CSN_ to AGND ..................-0.3V to +6V
All Other Pins to AGND ............................-0.3V to (V
REG
+ 0.3V)
REG Continuous Output Current
(Limited by Power Dissipation, No Thermal or Short-Circuit
Protection).........................................................................67mA
REF Continuous Output Current ........................................200µA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TSSOP (derate 23.8mW/°C above +70°C) .....1904mW
Package Thermal Resistance (
θ
JC
) ...................................2°C/W
Operating Temperature Ranges
MAX5066EUI ...................................................-40°C to +85°C
MAX5066AUI .................................................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
IN
= V
REG
= V
DD
= V
EN_
= +5V, T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted, circuit of Figure 6. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
SYSTEM SPECIFICATIONS
528
Input Voltage Range V
IN
IN and REG shorted together for +5V
operation
4.75
5.5
V
Quiescent Supply Current I
IN
f
OSC
= 500kHz, DH_, DL_ = open 4 20 mA
STARTUP/INTERNAL REGULATOR OUTPUT (REG)
REG Undervoltage Lockout UVLO V
REG
rising 4.0
4.15
4.5 V
Hysteresis V
HYST
200
mV
REG Output Accuracy V
IN
= 5.8V to 28V, I
SOURCE
= 0 to 65mA
4.75 5.10 5.30
V
REG Dropout V
IN
< 5.8V, I
SOURCE
= 60mA 0.5 V
INTERNAL REFERENCE
Internal Reference Voltage V
EAN_
EAN_ connected to EAOUT_ (Note 2)
0.6135
V
Internal Reference Voltage
Accuracy
V
EAN_
V
IN
= V
REG
= 4.75V to 5.5V or V
IN
= 5V to
28V, EAN_ connected to EAOUT_ (Note 2)
-0.9 +0.9
%
EXTERNAL REFERENCE VOLTAGE OUTPUT (REF)
Accuracy V
REF
I
REF
= 100µA
3.23
3.3
3.37
V
Load Regulation I
REF
= 0 to 200µA 3.2 3.4 V
MOSFET DRIVERS
p-Channel Output Driver
Impedance
R
ON_P
1.35
4 Ω
n-Channel Output Driver
Impedance
R
ON_N
0.45 1.35
Ω
Output Driver Source Current
I
DH_
, I
DL_
2.5 A
Output Driver Sink Current
I
DH_
, I
DL_
8A
Nonoverlap Time (Dead Time) t
NO
C
DH_
or C
DL_
= 5nF 30 ns
MAX5066
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
REG
= V
DD
= V
EN_
= +5V, T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted, circuit of Figure 6. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OSCILLATOR
R
RT
= 12.4kΩ
1000
Switching Frequency f
SW
1MHz (max)
switching
frequency per
phase
R
RT
= 127kΩ 100
kHz
f
SW
= 250kHz nominal, R
RT
= 50kΩ
-7.5 +7.5
Switching Frequency Accuracy
f
SW
= 1MHz nominal, R
RT
= 12.4kΩ
-10 +10
%
RT/CLKIN Output Voltage
V
RT/CLKIN
1.225
V
RT/CLKIN Current Sourcing
Capability
I
RT/CLKIN
0.5 mA
RT/CLKIN Logic-High Threshold
V
RT/CLKIN_H
2.4 V
RT/CLKIN Logic-Low Threshold
V
RT/CLKIN_L
0.8 V
RT/CLKIN High Pulse Width
t
RT/CLKIN
30 ns
RT/CLKIN Synchronization
Frequency Range
f
RT/CLKIN
200 2000
kHz
CURRENT LIMIT
Average Current-Limit Threshold
V
CL_
V
CSP_
- V
CSN_
20.4
22.5
24.75
mV
Reverse Current-Limit Threshold
V
RCL_
V
CSP_
- V
CSN_
-3.13 -1.63 -0.1
mV
Cycle-by-Cycle Current-Limit
Threshold
V
CLpk_
V
CSP_
- V
CSN_
52.5 mV
Cycle-by-Cycle Current-Limit
Response Time
t
R
260 ns
DIGITAL FAULT INTEGRATION (DF_)
Number of Switching Cycles to
Shutdown in Current-Limit
NS
DF_
32,768
Clock
cycles
Number of Switching Cycles to
Recover from Shutdown
NR
DF_
524,288
Clock
cycles
CURRENT-SENSE AMPLIFIER
CSP_ to CSN_ Input Resistance R
CS_
1.9835
kΩ
V
IN
= V
REG
= 4.75V to 5.5V or
V
IN
= 5V to 10V
-0.3 +3.6
V
Common-Mode Range
V
CMR
(
CS
)
V
IN
= 7V to 28V
-0.3 +5.5
V
Input Offset Voltage
V
OS
(
CS
)
100 µV
Amplifier Gain A
V(CS)
36 V/V
-3dB Bandwidth f
-3dB
4
MHz
V
CSP_
= 5.5V, sinking 120
CSP_ Input Bias Current I
CSA(IN)
V
CSP_
= 0V, sourcing 30
µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

MAX5066EUI+T

Mfr. #:
Buy MAX5066EUI+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Synch Buck Controller
Lifecycle:
New from this manufacturer.
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