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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15049 Datasheet

Triple-Output Buck Controllers

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EVALUATION KIT AVAILABLE
MAX15048/MAX15049
Triple-Output Buck Controllers
with Tracking/Sequencing
General Description
The MAX15048/MAX15049 are triple-output pulse-width
modulated (PWM), step-down, DC-DC controllers with
tracking (MAX15048) and sequencing (MAX15049)
options. The devices operate over the 4.7V to 23V input-
voltage range. Each PWM controller provides an adjustable
output down to 0.6V and delivers up to 15A of load current
with excellent load and line regulation. The MAX15049 can
start into prebiased outputs. The MAX15048/MAX15049
are optimized for high-performance, small-size power-
management solutions.
The options of coincident or ratiometric tracking (MAX15048)
or output sequencing (MAX15049) allow the tailoring of
the power-up/power-down sequence depending on the
system requirements. Each of the MAX15048/MAX15049
PWM sections utilizes a voltage-mode control scheme with
external compensation, allowing for good noise immunity
and maximum flexibility with a wide selection of inductor
values and capacitor types. Each PWM section operates at
the same fixed switching frequency that is programmable
from 200kHz to 1.2MHz. Each converter, operating at up to
1.2MHz with 120N out-of-phase, increases the input capaci-
tor ripple frequency up to 3.6MHz, reducing the RMS input
ripple current and thus the size of the input bypass capaci-
tor significantly. The MAX15048/MAX15049 integrate boost
diodes for additional system cost savings.
The MAX15048/MAX15049 include internal undervolt-
age lockout (UVLO) with hysteresis and digital soft-start
(MAX15048/MAX15049)/soft-stop (MAX15048) for glitch-
free power-up and power-down of the converter. The
power-good circuitry (PGOOD) monitors all three outputs
and provides a power-good signal to the system control/
processor when all outputs are within regulation. Protection
features include lossless valley-mode current limit, hiccup
mode output short-circuit protection, and thermal shutdown.
The MAX15048/MAX15049 are available in space-saving,
5mm x 5mm, lead-free, 32-pin TQFN-EP packages and
are specified for operation over the -40NC to +85NC
extended temperature range.
Applications
Point-of-Load DC-DC Converters
ASIC/CPU/DSP Core and I/O Voltages
DDR Power Supply
Base-Station Power Supplies
Telecom and Networking Power Supplies
RAID Control Power Supplies
Set-Top Boxes
Features
S 4.7V to 23V or 5V ±10% Input Voltage Range
S Triple-Output Synchronous Buck Controllers with
120° Out-of-Phase Operation
S Prebias Power-Up (MAX15049)
S Output Voltage Adjustable Down to 0.6V
S Coincident/Ratiometric Tracking (MAX15048)
S Accurate Sequencing Through Enable Threshold
(MAX15049)
S External Compensation for Maximum Flexibility
S Digital Soft-Start (MAX15048/MAX15049) and Soft-
Stop (MAX15048)
S Lossless Valley-Mode Current Sensing Using
RDS(ON) of the Low-Side MOSFET
S PGOOD Output
S Integrated Bootstrap Diodes
S Programmable Switching Frequency from 200kHz
to 1.2MHz
S Thermal Shutdown and Hiccup Mode Short-Circuit
Protection
S Space-Saving (5mm x 5mm), 32-Pin TQFN
Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX15048ETJ+ -40NC to +85NC 32 TQFN-EP*
MAX15049ETJ+ -40NC to +85NC 32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Typical Operating
Circuit (Coincident Tracking)
VOUT2
IN
VOUT3
VOUT1
DH3
LX3
BST3
DL3
PGND3
FB3
COMP3
EN3
MAX15048
EN1
DH1
LX1
BST1
DL1
PGND1
FB1
COMP1
IN
IN
VOUT1
VREG
VOUT1
VOUT2
VOUT3
SOFT-START
SOFT-STOP
COINCIDENT TRACKING OUTPUTS
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5110; Rev 0; 1/10


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15049 Datasheet

Triple-Output Buck Controllers

No Preview Available !

MAX15048/MAX15049
Triple-Output Buck Controllers
with Tracking/Sequencing
ABSOLUTE MAXIMUM RATINGS
IN, LX_ to SGND....................................................-0.3V to +30V
BST_ to SGND........................................................-0.3V to +30V
BST_ to LX_..............................................................-0.3V to +6V
REG, DREG_, EN_, RT to SGND..............................-0.3V to +6V
PGOOD, FB_, COMP_ to SGND..............................-0.3V to +6V
DL_ to PGND_......................................-0.3V to (VDREG_ + 0.3V)
DH_ to LX_..............................................-0.3V to (VBST_ + 0.3V)
PGND to SGND, PGND_
to Any Other PGND_..........................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70NC)
32-Pin TQFN (derate 34.5mW/NC above +70NC)....2758.6mW
Junction-to-Case Thermal Resistance (BJC)
(Note 1)......................................................................2NC/W
Junction-to-Ambient Thermal Resistance (BJA)
(Note 1)....................................................................29NC/W
Operating Junction Temperature Range............ -40NC to +85NC
Maximum Junction Temperature......................................+150NC
Storage Temperature Range............................. -60NC to +150NC
Lead Temperature (soldering, 10s)...... ………….………+300NC
Soldering (reflow).................................. ………….………+260NC
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.
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.
ELECTRICAL CHARACTERISTICS
(VIN = 12V or VIN = VREG = 5V, VDREG_ = VREG, VPGND_ = 0V, CREG = 2.2FF, RRT = 39.2kI, TA = -40NC to +85NC, unless otherwise
noted. Typical values are at TA = TJ = +25NC.) (Note 2)
PARAMETER
SYSTEM SPECIFICATIONS
Input Voltage Range
Input Undervoltage-Lockout
Threshold
SYMBOL
CONDITIONS
VIN
VUVLO
VIN = VREG = VDREG_ (Note 3)
VIN rising
MIN TYP MAX UNITS
4.7 23
4.5 5.5
4.0 4.2 4.4
V
V
Input Undervoltage-Lockout
Hysteresis
0.3 V
Operating Supply Current
VIN = 12V, VFB_ = 0.8V
Shutdown Supply Current
VIN = 12V, EN_ = 0, PGOOD unconnected
VOLTAGE REGULATOR (REG)
Output-Voltage Set Point
VREG VIN = 6V to 23V
Load Regulation
IREG = 0 to 60mA, VIN = 6V
BOOTSTRAP SWITCH
Internal Boost Switch Resistance
VBST,LX = 5V
TRANSCONDUCTANCE ERROR AMPLIFIER/DIGITAL SOFT-START/-STOP
FB_ Input Bias Current
FB_ Voltage Set Point
VFB_
FB_ to COMP_ Transconductance
COMP_ Output Swing
Open-Loop Gain
Unity-Gain Bandwidth
Soft-Start/-Stop Duration
Reference Voltage Steps
69
100 200
mA
FA
4.75
5.25
0.2
V
V
3I
-1
0.594
0.75
0.600
2.0
80
10
2048
64
+1
0.606
3.5
FA
V
mS
V
dB
MHz
Clocks
Steps
2   Maxim Integrated


Part Number MAX15049
Description Triple-Output Buck Controllers
Maker Maxim Integrated Products
PDF Download

MAX15049 Datasheet PDF






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