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MAX15021 PDF даташит

Спецификация MAX15021 изготовлена ​​​​«Maxim Integrated Products» и имеет функцию, называемую «Step-Down DC-DC Regulator».

Детали детали

Номер произв MAX15021
Описание Step-Down DC-DC Regulator
Производители Maxim Integrated Products
логотип Maxim Integrated Products логотип 

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MAX15021 Даташит, Описание, Даташиты
19-4106; Rev 0; 5/08
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Tracking/Sequencing Capability
www.datasheet4u.com
General Description
The MAX15021 is a dual-output, pulse-width-modulated
(PWM), step-down DC-DC regulator with tracking (coin-
cident and ratiometric) and sequencing options. The
device operates from 2.5V to 5.5V and each output can
be adjusted from 0.6V to the input supply (VAVIN). The
MAX15021 delivers up to 4A (regulator 1) and 2A (reg-
ulator 2) of output current. This device offers the ability
to adjust the switching frequency from 500kHz to 4MHz
and provides the capability of optimizing the design in
terms of size and performance.
The MAX15021 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 MAX15021 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 MAX15021 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
MAX15021ATI+
TEMP RANGE
-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 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 20µA 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
N.C. 22
COMP2 23
FB2 24
EN2 25
SGND 26
AVIN 27
RT 28
+
MAX15021
*EP
14 N.C.
13 N.C.
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.









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MAX15021 Даташит, Описание, Даташиты
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Tracking/Sequencing Capability
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AVIN, PVIN_, DVDD_, EN_, FB_, RT,
SEL to SGND .........................................................-0.3V to +6V
COMP_ to SGND .....................................-0.3V to (VAVIN + 0.3V)
PGND_ to SGND ...................................................-0.3V to +0.3V
LX_ Current (Note 1)
Regulator 1...............................................................................6A
Regulator 2...............................................................................3A
Current into Any Pin other than PVIN_,
LX_, and PGND_ ..............................................................50mA
Continuous Power Dissipation (TA = +70°C)
28-Pin TQFN (derate 34.5mW/°C above +70°C) .....2758.6mW
Junction-to-Case Thermal Resistance (θJC)(Note 2) .........2°C/W
Junction-to-Ambient Thermal Resistance (θJA)(Note 2) ..29°C/W
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: LX_ has internal diodes to PGND_ and PVIN_. Applications that forward bias these diodes should take care not to exceed
the IC’s package power dissipation.
Note 2: 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 see www.maxim-ic.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
(VAVIN = VPVIN_ = VDVDD_ = 3.3V, VPGND_ = VSGND_ = 0V, RT = 25kΩ, and TA = TJ = -40°C to +125°C, unless otherwise noted.
Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SYSTEM SPECIFICATIONS
Input-Voltage Range
Undervoltage Lockout Threshold
VAVIN = VPVIN1 = VPVIN2 = VDVDD1 =
VDVDD2
2.5
5.5
AVIN rising
2.1 2.2 2.3
V
V
Undervoltage Lockout Hysteresis
0.12 V
Operating Supply Current
Shutdown Supply Current
PWM DIGITAL SOFT-START/SOFT-STOP
VEN_= 1.3V, VFB_ = 0.8V
VEN_ = 0V
3.5 6
20 65
mA
µA
Soft-Start/Soft-Stop Duration
4096
Clock
Cycles
Reference Voltage Steps
64 Steps
PWM ERROR AMPLIFIERS
FB1, FB2 Input Bias Current
-1 +1 µA
FB1, FB2 Voltage Set-Point
0.593 0.599 0.605
V
COMP1, COMP2 Voltage Range
Error-Amplifier Open-Loop Gain
ICOMP_ = -250µA to +250µA
0.3
VAVIN - 0.5
V
80 dB
Error-Amplifier Unity-Gain Bandwidth
12 MHz
POWER MOSFETs
Regulator 1 p-Channel MOSFET RDSON
Regulator 1 n-Channel MOSFET RDSON
Regulator 1 Gate Charge
Maximum LX1 RMS Current
VDVDD1 = 5V
VDVDD1 = 5V
VDVDD1 = 5V
50 90
30 50
8
4
mΩ
mΩ
nC
A
Regulator 2 p-Channel MOSFET RDSON
Regulator 2 n-Channel MOSFET RDSON
Regulator 2 Gate Charge
Maximum LX2 RMS Current
VDVDD2 = 5V
VDVDD2 = 5V
VDVDD2 = 5V
100 180
60 100
4
2
mΩ
mΩ
nC
A
2 _______________________________________________________________________________________









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MAX15021 Даташит, Описание, Даташиты
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Tracking/Sequencing Capability
www.daEtaLshEeeCt4Tu.cRomICAL CHARACTERISTICS (continued)
(VAVIN = VPVIN_ = VDVDD_ = 3.3V, VPGND_ = VSGND_ = 0V, RT = 25kΩ, and TA = TJ = -40°C to +125°C, unless otherwise noted.
Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
PWM CURRENT LIMIT AND HICCUP MODE
Regulator 1 Peak Current Limit
Regulator 1 Valley Current Limit
Regulator 2 Peak Current Limit
Regulator 2 Valley Current Limit
Number of Cumulative Current-Limit
Events to Hiccup
Number of Consecutive Noncurrent
Limit Cycles to Clear NCL
Hiccup Timeout
NCL
NCLR
NHT
VAVIN = 3.3V
VAVIN = 2.5V
VAVIN = 3.3V
VAVIN = 2.5V
VAVIN = 3.3V
VAVIN = 2.5V
VAVIN = 3.3V
VAVIN = 2.5V
4.5
3.4
4.0
3.0
2.25
1.70
2.0
1.5
4.9
3.65
4.9
3.7
2.45
1.85
2.5
1.85
4
3
8192
5.3
3.95
5.65
4.25
2.65
1.98
2.83
2.13
A
A
A
A
Clock
Cycles
Clock
Cycles
Clock
Cycles
ENABLE/SEL
EN_ Threshold
EN_ Hysteresis
EN_ Input Current
SEL High Threshold
SEL Low Threshold
SEL Input Bias Current
OSCILLATOR
VEN_ rising
Present only during startup
1.207 1.225 1.243
0.12
-2.5 +2.5
0.85 x VAVIN
0.2 x VAVIN
-100
+100
V
V
µA
V
V
µA
Switching Frequency Range
fSW
fSW = 3MHz x [VRT(V)/1.067(V)]
(Note 4)
500
4000
kHz
Oscillator Accuracy
Phase Shift Between Regulators
RT Current
RT Voltage Range
Minimum Controllable On-Time
Minimum Controllable Off-Time
PWM Ramp Amplitude
PWM Ramp Valley
THERMAL SHUTDOWN
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
fSW 1500kHz
fSW > 1500kHz
0 < VRT < 1.067V
VRT
Temperature rising
-6
-10
31.30
0.13
180
32
60
60
VAVIN/4
0.3
+6
+10
32.58
1.067
%
Degrees
µA
V
ns
ns
V
V
+160
15
°C
°C
Note 3: Specifications are 100% production tested at TA = +25°C and TA = +125°C. Maximum and minimum specifications over
temperature are guaranteed by design.
Note 4: When operating with AVIN = 2.5V, the maximum switching frequency should be derated to 3MHz.
_______________________________________________________________________________________ 3










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