MAX15022ATI+ Maxim Integrated Products, MAX15022ATI+ Datasheet

IC REG SYNC DUAL 28-TQFN-EP

MAX15022ATI+

Manufacturer Part Number
MAX15022ATI+
Description
IC REG SYNC DUAL 28-TQFN-EP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX15022ATI.pdf (27 pages)

Specifications of MAX15022ATI+

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
Input Voltage
2.5 V to 5.5 V
Supply Current
3.5 mA
Switching Frequency
4000 KHz
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 (V
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.
19-4107; Rev 0; 5/08
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.
+ Denotes a lead-free package.
* EP = Exposed pad.
MAX15022ATI+
RFID Reader Cards
Power-over-Ethernet (PoE) IP Phones
Automotive Multimedia
Multivoltage Supplies
Networking/Telecom
PART
AVIN
). The MAX15022 delivers up to 4A (regu-
________________________________________________________________ Maxim Integrated Products
-40°C to +125°C
TEMP RANGE
Ordering Information
General Description
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
Applications
PIN-PACKAGE
28 TQFN-EP*
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 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
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 30µA 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
EN2
FB2
B4
RT
22
23
24
25
26
27
28
21
1
+
20
2
(5mm x 5mm)
THIN QFN
19
MAX15022
3
Pin Configuration
18
4
17
5
16
*EP
6
15
7
Features
14
13
12
11
10
9
8
AVIN
FB3
B3
COMP1
FB1
EN1
DVDD1
PGND1
1

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MAX15022ATI+ Summary of contents

Page 1

... 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 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 Dual LDO Controllers ABSOLUTE MAXIMUM RATINGS AVIN, PVIN_, B_, 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 ...

Page 3

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers ELECTRICAL CHARACTERISTICS (continued 3.3V, V AVIN PVIN_ DVDD_ PGND_ Typical values are +25°C.) (Note 3) A PARAMETER SYMBOL LDO CONTROLLERS FB3, ...

Page 4

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers ELECTRICAL CHARACTERISTICS (continued 3.3V, V AVIN PVIN_ DVDD_ PGND_ Typical values are +25°C.) (Note 3) A PARAMETER SYMBOL ENABLE/SEL EN_ Threshold ...

Page 5

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

Page 6

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers ( 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 ...

Page 7

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers ( AVIN DVDD1 DVDD2 PVIN1 otherwise noted.) CHANNEL 1 LOAD STEP RESPONSE MAX15022 toc15 EN2 = 0V 20 s/div CHANNEL 2 LOAD ...

Page 8

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers ( AVIN DVDD1 DVDD2 PVIN1 otherwise noted.) CHANNEL 3 OUTPUT VOLTAGE vs. INPUT VOLTAGE 2.500 2.495 2.490 I = 10mA OUT3 2.485 ...

Page 9

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers PIN NAME Transconductance Amplifier Open-Drain Output for LDO Controller 3. Connect B3 to the base external PNP transistor to regulate output 3. Feedback Regulation Point for ...

Page 10

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers 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 LEVEL ...

Page 11

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers MAX15022 PWM CONTROLLER 2 DUAL LDO CONTROLLERS 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 ...

Page 12

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers Detailed Description The MAX15022 incorporates dual-output, PWM, step- down, DC-DC regulators and dual LDO controllers with tracking and sequencing options. The device operates over the input-voltage range of 2.5V to ...

Page 13

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers 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 ...

Page 14

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers 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 ...

Page 15

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers Effective Input-Voltage Range Although the MAX15022’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 MAX15022’s duty-cycle limitations ...

Page 16

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers 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 PVIN_ The MAX15022 ...

Page 17

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers Below are equations that define the power modulator AVIN Gain MOD(DC RAMP ESR OUT OUT R DCR OUT 1 ...

Page 18

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers 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 ...

Page 19

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers 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 ...

Page 20

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers Solving for ESR [kHz where V is the 0.6V (typ) ...

Page 21

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers 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 ...

Page 22

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers LDO Controllers Design Procedure PNP Pass Transistors Selection The pass transistors must meet specifications for current gain (ß), input capacitance, collector-emitter saturation voltage, and power dissipation. The transistor’s current gain ...

Page 23

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers The input capacitance to the base of the pass transistor (C ), any external base-to-emitter capacitance (C QIN see the Base-Drive Noise Reduction section), the tran- sistor’s input resistance (R ...

Page 24

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers Minimum Load Requirements (Linear Regulators) Under no-load conditions, leakage currents from the pass transistors supply the output capacitor, even when the transistor is off. Generally, this is not a prob- ...

Page 25

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers V OUT2 OUT3 R 1EN3 V C OUT3 R 1FB3 R R 2FB3 2EN3 ...

Page 26

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers OUT3 R 1EN3 C OUT3 R 1FB3 R R 2FB3 2EN3 ...

Page 27

... 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 ____________________ 27 © 2008 Maxim Integrated Products ...

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