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MAX15021ATI+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
MAX15021
Dual, 4A/2A, 4MHz, Step-Down
DC-DC Regulator withTracking/
Sequencing Capability
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 (V
AVIN
). 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
Benefits and Features
• Integration Reduces Power-Supply Footprint for Space-
Constrained Designs
• Dual-Output Synchronous Buck Regulators
• Integrated Switches for 4A and 2A Output Currents
• Programmable Switching Frequency from 500kHz
to 4MHz
• 28-Pin TQFN Package (5mm x 5mm)
• 180° Out-Of-Phase Operation Reduces Input
Ripple Current and Thus the Size of the Input
Bypass Capacitors
• Sophisticated Tracking/Sequencing Functions
Facilitate Reliable Processor Operation
• Digital Soft-Start and Soft-Stop for Tracking
Applications
• Digital Soft-Start into a Prebiased Load for
Sequencing Applications
• Sequencing or Coincident/Ratiometric Tracking
• Flexible Enough for Use in a Range of Designs
• 2.5V to 5.5V Input Voltage Range
• Output-Voltage Adjustable from 0.6V to V
AVIN
•
External Compensation for Maximum Flexibility
• 100% Maximum Duty Cycle
• Integrated Protection Features Save Space and
Increase Reliability
• Lossless, Cycle-by-Cycle Current Sensing
• Thermal Shutdown and Hiccup-Mode Short-Circuit
Protection
• 20µA Shutdown Current Extends Battery Life in
Portable Applications
MAX15021
TOP VIEW
26
27
25
24
10
9
11
PGND1
PVIN1
PVIN1
LX1
PGND1
12
SEL
N.C.
LX2
PGND2
N.C.
DVDD2
N.C.
1
+
2
EN2
4
*EP
*EP = EXPOSED PAD.
567
2021 19 17 16 15
SGND
AVIN
COMP1
FB1
EN1
DVDD1
LX1
PVIN2
3
18
28
8
RT
PGND1
FB2
23
13
N.C.
COMP2
22
14
N.C.
N.C.
Pin Configuration
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX15021ATI/V+
-40°C to +125°C
28 TQFN-EP*
/V denotes an automotive qualified part.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
19-4106; Rev 2; 4/15
MAX15021
Dual, 4A/2A, 4MHz, Step-Down
DC-DC Regulator withTracking/
Sequencing Capability
Maxim Integrated | 2www.maximintegrated.com
Absolute Maximum Ratings
Electrical Characteristics
(V
AVIN
= V
PVIN_
= V
DVDD_
= 3.3V, V
PGND_
= V
SGND_
= 0V, R
T
= 25kΩ, and T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 3)
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.
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.maximintegrated.com/thermal-tutorial
.
AVIN, PVIN_, DVDD_, EN_, FB_, RT,
SEL to SGND .........................................................-0.3V to +6V
COMP_ to SGND .....................................-0.3V to (V
AVIN
+ 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 (T
A
= +70°C)
28-Pin TQFN (derate 34.5mW/°C above +70°C) .....2758.6mW
Junction-to-Case Thermal Resistance (θ
JC
)(Note 2) .........2°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
)(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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYSTEM SPECIFICATIONS
Input-Voltage Range
V
AVIN
= V
PVIN1
= V
PVIN2
= V
DVDD1
=
V
DVDD2
2.5 5.5 V
Undervoltage Lockout Threshold AVIN rising 2.1 2.2 2.3 V
Undervoltage Lockout Hysteresis 0.12 V
Operating Supply Current V
EN_
= 1.3V, V
FB_
= 0.8V 3.5 6 mA
Shutdown Supply Current V
EN_
= 0V 20 65 µA
PWM DIGITAL SOFT-START/SOFT-STOP
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 I
COMP
_ = -250µA to +250µA 0.3 V
AVIN
- 0.5 V
Error-Amplifier Open-Loop Gain 80 dB
Error-Amplifier Unity-Gain
12 MHz
POWER MOSFETs
Regulator 1 p-Channel MOSFET
V
DVDD1
= 5V 50 90 mΩ
Regulator 1 n-Channel MOSFET
V
DVDD1
= 5V 30 50 mΩ
Regulator 1 Gate Charge V
DVDD1
= 5V 8 nC
Maximum LX1 RMS Current 4A
Regulator 2 p-Channel MOSFET
V
DVDD2
= 5V 100 180 mΩ
Regulator 2 n-Channel MOSFET
V
DVDD2
= 5V 60 100 mΩ
Regulator 2 Gate Charge V
DVDD2
= 5V 4 nC
Maximum LX2 RMS Current 2A
MAX15021
Dual, 4A/2A, 4MHz, Step-Down
DC-DC Regulator withTracking/
Sequencing Capability
Maxim Integrated | 3www.maximintegrated.com
Electrical Characteristics (continued)
(V
AVIN
= V
PVIN_
= V
DVDD_
= 3.3V, V
PGND_
= V
SGND_
= 0V, R
T
= 25kΩ, and T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 3)
Note 3: Specifications are 100% production tested at T
A
= +25°C and T
A
= +125°C. Maximum and minimum specifications over
temperature are guaranteed by design.
Note 4: When operating with V
AVIN
= 2.5V, the maximum switching frequency should be derated to 3MHz.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PWM CURRENT LIMIT AND HICCUP MODE
V
AVIN
= 3.3V 4.5 4.9 5.3
Regulator 1 Peak Current Limit
V
AVIN
= 2.5V 3.4 3.65 3.95
A
V
AVIN
= 3.3V 4.0 4.9 5.65
Regulator 1 Valley Current Limit
V
AVIN
= 2.5V 3.0 3.7 4.25
A
V
AVIN
= 3.3V 2.25 2.45 2.65
Regulator 2 Peak Current Limit
V
AVIN
= 2.5V 1.70 1.85 1.98
A
V
AVIN
= 3.3V 2.0 2.5 2.83
Regulator 2 Valley Current Limit
V
AVIN
= 2.5V 1.5 1.85 2.13
A
Number of Cumulative Current-
Limit Events to Hiccup
N
CL
4
Clock
Cycles
Number of Consecutive Noncurrent
Limit Cycles to Clear N
CL
N
CLR
3
Clock
Cycles
Hiccup Timeout N
HT
8192
Clock
Cycles
ENABLE/SEL
EN_ Threshold V
EN_
rising 1.207 1.225 1.243 V
EN_ Hysteresis 0.12 V
EN_ Input Current -2.5 +2.5 µA
SEL High Threshold 0.85 x V
AVIN
V
SEL Low Threshold 0.2 x V
AVIN
V
SEL Input Bias Current Present only during startup -100 +100 µA
OSCILLATOR
Switching Frequency Range f
SW
f
SW
= 3MHz x [V
RT
(V)/1.067(V)]
(Note 4)
500 4000 kHz
f
SW
≤ 1500kHz -6 +6
Oscillator Accuracy
f
SW
> 1500kHz -10 +10
%
Phase Shift Between Regulators 180 Degrees
RT Current 0 < V
RT
< 1.067V 31.30 32 32.58 µA
RT Voltage Range V
RT
0.13 1.067 V
Minimum Controllable On-Time 60 ns
Minimum Controllable Off-Time 60 ns
PWM Ramp Amplitude V
AVIN
/4 V
PWM Ramp Valley 0.3 V
THERMAL SHUTDOWN
Thermal Shutdown Temperature Temperature rising +160 °C
Thermal Shutdown Hysteresis 15 °C
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MAX15021ATI+T

Mfr. #:
Buy MAX15021ATI+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators Dual 4A/2A 4MHz w/Tracking/Seq
Lifecycle:
New from this manufacturer.
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