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PDF MAX15022 Data sheet ( Hoja de datos )
| Número de pieza | MAX15022 | |
| Descripción | Step-Down DC-DC Regulator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX15022 (archivo pdf) en la parte inferior de esta página. Total 27 Páginas | ||
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19-4107; Rev 0; 5/08
EVAALVUAAILTAIOBNLEKIT
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
www.datasheet4u.com
General Description
The MAX15022 is a dual-output, pulse-width-modulated
(PWM), step-down DC-DC regulator with dual LDO con-
trollers. The device operates from 2.5V to 5.5V and
each output can be adjusted from 0.6V to the input
supply (VAVIN). The MAX15022 delivers up to 4A (regu-
lator 1) and 2A (regulator 2) of output current with two
LDO controllers that can be used to drive two external
PNP transistors to provide two additional outputs. This
device offers the ability to adjust the switching frequen-
cy from 500kHz to 4MHz and provides the capability of
optimizing the design in terms of size and performance.
The MAX15022 utilizes a voltage-mode control scheme
with external compensation to provide good noise
immunity and maximum flexibility in selecting inductor
values and capacitor types. The dual switching regula-
tors operate 180° out-of-phase, thereby reducing the
RMS input ripple current and thus the size of the input
bypass capacitor significantly.
The MAX15022 offers the ability to track (coincident or
ratiometric) or sequence during power-up and power-
down operation. When sequencing, it powers up glitch-
free into a prebiased output.
Additional features include an internal undervoltage
lockout with hysteresis and a digital soft-start/soft-stop
for glitch-free power-up and power-down. Protection
features include lossless cycle-by-cycle current limit,
hiccup-mode output short-circuit protection, and ther-
mal shutdown.
The MAX15022 is available in a space-saving, 5mm x
5mm, 28-pin TQFN-EP package and is specified for
operation from -40°C to +125°C temperature range.
Applications
RFID Reader Cards
Power-over-Ethernet (PoE) IP Phones
Automotive Multimedia
Multivoltage Supplies
Networking/Telecom
Ordering Information
PART
TEMP RANGE
MAX15022ATI+
-40°C to +125°C
+Denotes a lead-free package.
*EP = Exposed pad.
PIN-PACKAGE
28 TQFN-EP*
Features
o 2.5V to 5.5V Input-Voltage Range
o Dual-Output Synchronous Buck Regulators
o Integrated Switches for 4A and 2A Output
Currents
o 180° Out-Of-Phase Operation
o Output Voltage Adjustable from 0.6V to VAVIN
o Two LDO Controllers
o Lossless, Cycle-by-Cycle Current Sensing
o External Compensation for Maximum Flexibility
o Digital Soft-Start and Soft-Stop for Tracking
Applications
o Digital Soft-Start into a Prebiased Load for
Sequencing Applications
o Sequencing or Coincident/Ratiometric Tracking
o Programmable Switching Frequency from 500kHz
to 4MHz
o Thermal Shutdown and Hiccup-Mode Short-
Circuit Protection
o 30µA Shutdown Current
o 100% Maximum Duty Cycle
o Space-Saving (5mm x 5mm) 28-Pin TQFN
Package
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
B4 22
COMP2 23
FB2 24
EN2 25
SGND 26
AVIN 27
RT 28
+
MAX15022
*EP
14 FB3
13 B3
12 COMP1
11 FB1
10 EN1
9 DVDD1
8 PGND1
1 234567
*EP = EXPOSED PAD.
THIN QFN
(5mm x 5mm)
________________________________________________________________ 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.
1 page  
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
www.datasheet4u.com
Typical Operating Characteristics
(VAVIN = VDVDD1 = VDVDD2 = VPVIN1 = VPVIN2 = 5V, VOUT1 = 3.3V, VOUT2 = 1.5V, VPGND_ = 0V, RT = 16.5kΩ. TA = +25°C, unless
otherwise noted.)
100
90
80
70
60
50
40
30
20
10
0
100
CHANNEL 1 EFFICIENCY
vs. LOAD CURRENT
VPVIN1 = 3.3V
VPVIN1 = 5V
VOUT1 = 1.8V
fSW = 2MHz
EN2 = 0V
1000
LOAD CURRENT (mA)
5000
CHANNEL 1 EFFICIENCY
vs. LOAD CURRENT
100
90
80
70 VOUT1 = 1.0V
60 VOUT1 = 1.8V
50
40 VOUT1 = 3.3V
30
20
10
0
100
VPVIN1 = 5V
fSW = 2MHz
EN2 = 0V
1000
LOAD CURRENT (mA)
5000
100
90
80
70
60
50
40
30
20
10
0
100
CHANNEL 2 EFFICIENCY
vs. LOAD CURRENT
PVIN2 = 3.3V
PVIN2 = 5V
VOUT2 = 1.5V
fSW = 2MHz
EN1 = 0V
1000
LOAD CURRENT (mA)
3000
CHANNEL 2 EFFICIENCY
vs. LOAD CURRENT
100
90
80
70 VOUT2 = 2.5V
60 VOUT2 = 1.5V
50 VOUT2 = 1.0V
40
30
20
10
0
100
VPVIN2 = 5V
fSW = 2MHz
EN1 = 0V
1000
LOAD CURRENT (mA)
3000
3.320
3.318
3.316
3.314
3.312
3.310
3.308
3.306
3.304
3.302
3.300
0
CHANNEL 1
LOAD REGULATION
VPVIN1 = 5V
fSW = 2MHz
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
LOAD CURRENT (A)
1.5070
1.5065
1.5060
1.5055
1.5050
1.5045
1.5040
1.5035
1.5030
1.5025
1.5020
0
CHANNEL 2
LOAD REGULATION
VPVIN2 = 5V
VPVIN2 = 3.3V
fSW = 2MHz
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
LOAD CURRENT (A)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
SWITCHING FREQUENCY
vs. RT RESISTANCE
5 10 15 20 25 30 35
RT RESISTANCE (kΩ)
SWITCHING FREQUENCY
vs. TEMPERATURE
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
fSW = 2MHz
-0.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
www.datasheet4u.com
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
Functional Diagrams (continued)
EN4 EN3
MAX15022
PWM CONTROLLER 2
DUAL LDO CONTROLLERS
EN2
1.225V
1.1V
SEQ2
ON2
VREF
CLK2 DOWN2
DIGITAL
SOFT-START
AND SOFT-STOP
VREF
VR2
EN2
FB2
ON1 ON2
SEQ1
SEQ2
EN CONFIG
SEQ1
E/A
1.225V
1.1V
VREF
CLK1
DIGITAL
SOFT-START
SHDN
SHDN
1.25V
1.125V
VREF
CLK2
DIGITAL
SOFT-START
SEQ1 SEQ2
OVL
CONFIG
SHDN
OVL1
OVL2
CLK1 CLK2
OVL2 RES
ILIM2 OVERLOAD
MANAGEMENT
COMP2
CLK2
RAMP
CPWM
LEVEL
SHIFT
CLK
AVIN
D
Q
R
BREAK-
BEFORE-
MAKE
FB3
B3
FB4
B4
DVDD2
PVIN2
HIGH-SIDE
CURRENT
SENSE
LX2
LOW-SIDE
CURRENT
SENSE
PGND2
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet MAX15022.PDF ] | |
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