MAX15021ATI+ Maxim Integrated Products, MAX15021ATI+ Datasheet

IC REG SYNC DUAL 28-TQFN-EP

MAX15021ATI+

Manufacturer Part Number
MAX15021ATI+
Description
IC REG SYNC DUAL 28-TQFN-EP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX15021ATI.pdf (23 pages)

Specifications of MAX15021ATI+

Internal Switch(s)
Both
Synchronous Rectifier
Yes
Number Of Outputs
2
Voltage - Output
0.6 ~ 5.5 V
Current - Output
2A, 4A
Frequency - Switching
500kHz ~ 4MHz
Voltage - Input
2.5 ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
28-TQFN Exposed Pad
Power - Output
2.76W
Topology
Buck
Output Voltage
0.6 V to 5.5 V
Output Current
2 A, 4 A
Input Voltage
2.5 V to 5.5 V
Duty Cycle (max)
100 %
Switching Frequency
500 KHz to 4 MHz
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
2.5 V to 5.5 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
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.
19-4106; Rev 0; 5/08
+ Denotes a lead-free package.
* EP = Exposed pad.
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.
MAX15021ATI+
Regulator with Tracking/Sequencing Capability
RFID Reader Cards
Power-over-Ethernet (PoE) IP Phones
Automotive Multimedia
Multivoltage Supplies
Networking/Telecom
PART
________________________________________________________________ Maxim Integrated Products
-40°C to +125°C
Ordering Information
TEMP RANGE
General Description
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Applications
PIN-PACKAGE
28 TQFN-EP*
AVIN
). The
o 2.5V to 5.5V Input-Voltage Range
o Dual-Output Synchronous Buck Regulators
o Integrated Switches for 4A and 2A Output
o 180° Out-Of-Phase Operation
o Output Voltage Adjustable from 0.6V to V
o Lossless, Cycle-by-Cycle Current Sensing
o External Compensation for Maximum Flexibility
o Digital Soft-Start and Soft-Stop for Tracking
o Digital Soft-Start into a Prebiased Load for
o Sequencing or Coincident/Ratiometric Tracking
o Programmable Switching Frequency from 500kHz
o Thermal Shutdown and Hiccup-Mode Short-
o 20µA Shutdown Current
o 100% Maximum Duty Cycle
o Space-Saving (5mm x 5mm) 28-Pin TQFN
Currents
Applications
Sequencing Applications
to 4MHz
Circuit Protection
Package
TOP VIEW
*EP = EXPOSED PAD.
COMP2
SGND
AVIN
N.C.
EN2
FB2
RT
22
23
24
25
26
27
28
21
1
+
20
2
(5mm x 5mm)
THIN QFN
19
MAX15021
3
Pin Configuration
18
4
17
5
16
*EP
6
15
7
Features
14
13
12
11
10
9
8
AVIN
N.C.
N.C.
COMP1
FB1
EN1
DVDD1
PGND1
1

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MAX15021ATI+ Summary of contents

Page 1

... Power-over-Ethernet (PoE) IP Phones Automotive Multimedia Multivoltage Supplies Networking/Telecom Ordering Information PART TEMP RANGE MAX15021ATI+ -40°C to +125°C + Denotes a lead-free package Exposed pad. ________________________________________________________________ Maxim Integrated Products 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. ...

Page 2

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability ABSOLUTE MAXIMUM RATINGS AVIN, PVIN_, DVDD_, EN_, FB_, RT, SEL to SGND .........................................................-0.3V to +6V COMP_ to SGND .....................................-0. PGND_ to SGND ...................................................-0.3V to +0.3V LX_ Current (Note 1) ...

Page 3

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability ELECTRICAL CHARACTERISTICS (continued 3.3V, V AVIN PVIN_ DVDD_ PGND_ Typical values are +25°C.) (Note 3) A PARAMETER PWM CURRENT LIMIT AND HICCUP ...

Page 4

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability ( AVIN DVDD1 DVDD2 PVIN1 otherwise noted.) CHANNEL 1 EFFICIENCY vs. LOAD CURRENT 100 3.3V 70 PVIN1 60 V ...

Page 5

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability ( AVIN DVDD1 DVDD2 PVIN1 otherwise noted.) QUIESCENT CURRENT vs. TEMPERATURE 5.00 4.75 4.50 4.25 4.00 3.75 3.50 3.25 3.00 2.75 NO SWITCHING ...

Page 6

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability ( AVIN DVDD1 DVDD2 PVIN1 otherwise noted.) CHANNEL 1 LOAD STEP RESPONSE MAX15021 toc15 EN2 = 0V 20µs/div CHANNEL 2 LOAD STEP RESPONSE ...

Page 7

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability PIN NAME Track/Sequence Select Input. Connect SEL to ground to configure the device as a sequencer. Connect SEL to AVIN for tracking with output 1 as the master. Leave SEL unconnected ...

Page 8

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability AVIN 1.225V 1.1V 0.6V THERMAL REF SHDN CLK1 DOWN1 V REF SEQ1 V REF DIGITAL V R1 SOFT-START E/A AND SOFT-STOP EN1 FB1 COMP1 CLK1 EN RT RAMP OSC CLK2 8 ...

Page 9

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability SEQ2 EN2 ON2 1.225V 1.1V V REF CLK2 DOWN2 SEQ1 V REF DIGITAL V R2 SOFT-START E/A AND SOFT-STOP EN2 FB2 COMP2 CLK2 RAMP LEVEL SHIFT _______________________________________________________________________________________ Functional Diagrams (continued) SHDN ...

Page 10

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability Detailed Description The MAX15021 incorporates dual-output, PWM, step- down, DC-DC regulators with tracking and sequencing options. The device operates over the input-voltage range of 2.5V to 5.5V. Each PWM regulator provides ...

Page 11

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability Coincident/Ratiometric Tracking The enable inputs in conjunction with digital soft-start and soft-stop provide coincident/ratiometric tracking. Track an output voltage by connecting a resistive divider from the output being tracked to its ...

Page 12

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability The output of the internal voltage-mode error amplifier (COMP_) is provided for frequency compensation (see the Compensation-Design Guidelines section). FB_ is the inverting input of the error amplifier. The error amplifier ...

Page 13

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability Effective Input-Voltage Range Although the MAX15021’s regulators can operate from input supplies ranging from 2.5V to 5.5V, the input-volt- age range can be effectively limited by the MAX15021’s duty-cycle limitations for ...

Page 14

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability Use the following equation to calculate the input ripple when only one regulator is enabled: = × I [A] I [A] CIN(RMS) LOAD(MAX) ( × V [V] V OUT_ PVIN_ V ...

Page 15

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability Below are equations that define the power modulator AVIN = = Gain MOD(DC RAMP ⎛ ESR OUT π × × × ...

Page 16

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability As seen in Figure 4b, a Type II compensator provides for stable closed-loop operation, leveraging the +20dB/ decade slope of the capacitor’s ESR zero, while extend- ing the closed-loop gain-bandwidth of ...

Page 17

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability Type II: Compensation when f When the f is greater than Type II compensa- CO ESR tion network provides the necessary closed-loop com- pensated response. The Type II ...

Page 18

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability Solving for Ω × × ESR Ω π × × µ [kHz ...

Page 19

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability The locations of the zeros and poles should be such that the phase margin peaks around f Set the ratios of f -to-f and f -to er, ...

Page 20

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability Applications Information PCB Layout Guidelines Careful PCB layout is critical to achieve clean and sta- ble operation. Follow these guidelines for good PCB layout: 1) Place decoupling capacitors as close as ...

Page 21

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability AVIN RT PGND SGND R T Figure 7. MAX15021 Double Buck with Tracking ______________________________________________________________________________________ IN2 DD2 C CF2 ...

Page 22

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability AVIN RT PGND SGND R T Figure 8. MAX15021 Double Buck with Sequencing 22 ______________________________________________________________________________________ Typical Operating Circuits (continued) V OUT1 C R ...

Page 23

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 23 © 2008 Maxim Integrated Products ...

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