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PDF MAX15048 Data sheet ( Hoja de datos )

Número de pieza MAX15048
Descripción (MAX15048 / MAX15049) Triple-Output Buck Controllers
Fabricantes Maxim Integrated Products 
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19-5110; Rev 0; 1/10
EVAALVUAAILTAIOBNLEKIT
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
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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MAX15048 pdf
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Triple-Output Buck Controllers
with Tracking/Sequencing
Typical Operating Characteristics (continued)
(VIN = 12V, VDREG_ = VREG, VPGND_ = 0V, CREG = 2.2FF, RRT = 39.2kI, TA = +25NC, unless otherwise noted. See Figure 10.)
3.330
3.328
3.325
3.323
3.320
3.318
3.315
3.313
3.310
3.308
3.305
3.303
3.300
0
CONVERTER 1 OUTPUT VOLTAGE
vs. LOAD CURRENT
VIN = 5V
VIN = 12V
VOUT1 = 3.3V
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
SWITCHING FREQUENCY vs. RRT
1200
1100
1000
900
800
700
600
500
400
300
200
15.60
31.22
46.84 62.46
RRT (kI)
VIN = 12V
78.08 93.70
ERROR AMP TRANSCONDUCTANCE
vs. TEMPERATURE
3.0
2.8
VCOMP_ = 2V
VFB_ = 0.6V ± 0.02V
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
-40 -28 -15 -3 10 23 35 48 60 73 85
TEMPERATURE (°C)
1.810
1.809
1.808
1.807
1.806
1.805
1.804
1.803
1.802
1.801
1.800
0
CONVERTER 2 OUTPUT VOLTAGE
vs. LOAD CURRENT
VIN = 5V
VIN = 12V
VOUT2 = 1.8V
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
SWITCHING-FREQUENCY ACCURACY
vs. TEMPERATURE
0.5
0.4 fSW = 500kHz
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-40 -28 -15 -3 10 23 35 48 60 73 85
TEMPERATURE (°C)
VALLEY CURRENT LIMIT
vs. TEMPERATURE
95
90
VIN = 12V
85
80
75
70
65
60
55
50
45
40
-40 -28 -15 -3 10 23 35 48 60 73 85
TEMPERATURE (°C)
1.200
1.199
1.198
1.197
1.196
1.195
1.194
1.193
1.192
1.191
1.190
0
CONVERTER 3 OUTPUT VOLTAGE
vs. LOAD CURRENT
VIN = 12V
VIN = 5V
VOUT3 = 1.2V
12345
LOAD CURRENT (A)
6
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
4.70
4.65
4.60
4.55
4.50
4.70
REG OUTPUT VOLTAGE
vs. INPUT VOLTAGE
IREG = 60mA
8.36 12.02 15.68 19.34 23.00
INPUT VOLTAGE (V)
DL1 AND DH1 PEAK
SOURCE-AND-SINK CURRENT
MAX15048 toc12
CLOAD = 10nF
200ns/div
IDL1
(1A/div)
IDH1
(1A/div)
_______________________________________________________________________________________   5
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MAX15048 arduino
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Triple-Output Buck Controllers
with Tracking/Sequencing
Pin Description (continued)
PIN NAME
FUNCTION
Controller Power-Good Output. Pull up PGOOD with a resistor to a positive voltage below 5.5V.
12
PGOOD
For the MAX15048, PGOOD output releases when all three VFB_ voltages are above 0.55V. For the
MAX15049, PGOOD output releases when all three controllers are out of prebias and all three VFB_
voltages are above 0.55V.
13
COMP1
Controller 1 Transconductance Error-Amplifier Output. Connect COMP1 to the compensation
feedback network of output 1.
14
FB1
Controller 1 Feedback Regulation Point. Connect to the center tap of a resistive voltage-divider from
the converter output to SGND to set the output voltage. The FB1 voltage regulates to 0.6V (typ).
Controller 1 Enable Input. For tracking (MAX15048), EN1 must be above 0.6V, VEN-TH, for the PWM
15
EN1
controller to start outputs 1, 2, and 3. Controller 1 is the master. Use the master as the highest output
voltage in a coincident tracking configuration. For the MAX15049, EN1 must be above 0.6V for the
PWM controller to start output 1.
16 BST1 Controller 1 High-Side Gate-Driver Supply. Connect a 0.1FF ceramic capacitor from BST1 to LX1.
17
DH1
Controller 1 High-Side Gate-Driver Output. DH1 drives the gate of the high-side MOSFET.
18
LX1
Controller 1 High-Side MOSFET Source Connection/Synchronous MOSFET Drain Connection.
Connect the inductor and the negative side of the boost capacitor to LX1.
19
DREG1
Controller 1 Low-Side Gate-Driver Supply. Connect externally to REG through a 1I to 4.7I resistor.
Connect a minimum of 0.22FF ceramic capacitor from DREG1 to PGND1.
20 DL1 Controller 1 Low-Side Gate-Driver Output. DL1 is the gate-driver output for the synchronous MOSFET.
Controller 1 Power Ground. Connect the input filter capacitor’s negative terminal, the source of the
21 PGND1 synchronous MOSFET, and the output filter capacitor’s return to PGND1. Connect to SGND at a
single point near the input capacitor return terminal.
22
COMP3
Controller 3 Transconductance Error-Amplifier Output. Connect COMP3 to the compensation
feedback network of output 3.
23
FB3
Controller 3 Feedback Regulation Point. Connect to the center tap of a resistive voltage-divider from
the converter output to SGND to set the output voltage. The FB3 voltage regulates to 0.6V (typ).
Controller 3 Enable/Tracking Input. See Figure 2. When tracking (MAX15048), connect the same
24
EN3
resistive voltage-divider used for FB3 from output 1 to EN3 to SGND for coincident tracking. Connect
EN3 to analog ground for ratiometric tracking. When sequencing (MAX15049), EN3 must be above
0.6V for PWM controller 3 to start.
25 BST3 Controller 3 High-Side Gate-Driver Supply. Connect a 0.1FF ceramic capacitor from BST3 to LX3.
26
DH3
Controller 3 High-Side Gate-Driver Output. DH3 drives the gate of the high-side MOSFET.
27
LX3
Controller 3 High-Side MOSFET Source Connection/Synchronous MOSFET Drain Connection.
Connect the inductor and the negative side of the boost capacitor to LX3.
28
DREG3
Controller 3 Low-Side Gate-Driver Supply. Connect externally to REG through a 1I to 4.7I resistor.
Connect a minimum of 0.22FF ceramic capacitor from DREG3 to PGND3.
29 DL3 Controller 3 Low-Side Gate-Driver Output. DL3 is the gate-driver output for the synchronous MOSFET.
30
PGND3
Controller 3 Power Ground. Connect the input filter capacitor’s negative terminal, the source of the
synchronous MOSFET, and the output filter capacitor’s return to PGND3.
31
IN
Supply Input Connection. Connect to an external voltage source from 4.7V to 23V. For 4.5V to 5.5V
input applications, connect IN and REG together.
32
REG
5V Regulator Output. Bypass with a 2.2FF ceramic capacitor to SGND.
— EP Exposed Pad. Solder the exposed pad to a large SGND plane to improve thermal dissipation.
______________________________________________________________________________________   11
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