MAX15053EWL+T Maxim Integrated Products, MAX15053EWL+T Datasheet

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MAX15053EWL+T

Manufacturer Part Number
MAX15053EWL+T
Description
DC/DC Switching Regulators 2A Current-Mode Synchronous
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX15053EWLT.pdf (21 pages)

Specifications of MAX15053EWL+T

Lead Free Status / Rohs Status
Lead free / RoHS Compliant
19-5240; Rev 1; 3/11
The MAX15053 high-efficiency, current-mode, synchro-
nous step-down switching regulator with integrated
power switches delivers up to 2A of output current.
The device operates from 2.7V to 5.5V and provides an
output voltage from 0.6V up to 94% of the input voltage,
making the device ideal for distributed power systems,
portable devices, and preregulation applications.
The MAX15053 utilizes a current-mode control archi-
tecture with a high gain transconductance error ampli-
fier. The current-mode control architecture facilitates
easy compensation design and ensures cycle-by-cycle
current limit with fast response to line and load transients.
The MAX15053 offers selectable skip-mode functionality
to reduce current consumption and achieve a higher effi-
ciency at light output load. The low R
switches ensure high efficiency at heavy loads while min-
imizing critical inductances, making the layout design
a much simpler task with respect to discrete solutions.
Utilizing a simple layout and footprint assures first-pass
success in new designs.
The MAX15053 features a 1MHz, factory-trimmed, fixed-
frequency PWM mode operation. The high switching fre-
quency, along with the PWM current-mode architecture,
allows for a compact, all-ceramic capacitor design.
The MAX15053 offers a capacitor-programmable soft-
start reducing inrush current, startup into PREBIAS
operations, and a PGOOD open-drain output that can be
used as an interrupt and for power sequencing.
The MAX15053 is available in a 9-bump (3 x 3 array),
1.65mm x 1.65mm WLP package and is specified over
the -40NC to +85NC temperature range.
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.
Synchronous, Step-Down Switching Regulator
Distributed Power Systems
Preregulators for Linear Regulators
Portable Devices
Notebook Power
Server Power
IP Phones
_______________________________________________________________ Maxim Integrated Products 1
General Description
High-Efficiency, 2A, Current-Mode
Applications
DS(ON)
integrated
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
+Denotes a lead(Pb)-free/RoHS-compliant package.
MAX15053EWL+
Internal 30mI (typ) R
(typ) Low-Side MOSFETs at 5V
Continuous 2A Output Current Over Temperature
96% Efficiency with 3.3V Output at 2A
±1% Output Voltage Accuracy Over Load, Line,
and Temperature
Operates from 2.7V to 5.5V Supply
Cycle-by-Cycle Overcurrent Protection
Adjustable Output from 0.6V to Up to 0.94 x V
Programmable Soft-Start
Factory-Trimmed, 1MHz Switching Frequency
Stable with Low-ESR Ceramic Output Capacitors
Safe-Startup Into Prebiased Output
External Reference Input
Skip-Mode Functionality
Enable Input/Power-Good Output
Fully Protected Against Overcurrent and
Overtemperature
Input Undervoltage Lockout
PART
-40°C to +85°C
TEMP RANGE
Ordering Information
DS(ON)
High-Side and 18mI
PIN-PACKAGE
Features
9 WLP
IN

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MAX15053EWL+T Summary of contents

Page 1

... Distributed Power Systems Preregulators for Linear Regulators Portable Devices Notebook Power Server Power IP Phones _______________________________________________________________ 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. Internal 30mI (typ (typ) Low-Side MOSFETs at 5V ...

Page 2

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator ABSOLUTE MAXIMUM RATINGS IN, PGOOD to GND ................................................-0. GND ..................................................-0. GND .......................................- EN, COMP, FB, SS/REFIN, SKIP to GND ...-0. ...

Page 3

Synchronous, Step-Down Switching Regulator ELECTRICAL CHARACTERISTICS (continued 5V -40NC to +85NC, unless otherwise noted, typical values are PARAMETER SYMBOL Low-Side Switch Source Current- Limit Threshold LX Leakage Current RMS LX Output Current ...

Page 4

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator ( 1.8V 2A, Circuit of Figure OUT LOAD EFFICIENCY vs. OUTPUT CURRENT (PWM MODE) 100 3. 1.8V ...

Page 5

Synchronous, Step-Down Switching Regulator ( 1.8V 2A, Circuit of Figure OUT LOAD LOAD-TRANSIENT RESPONSE µ 40 s/div SWITCHING WAVEFORMS n 400 s/div INPUT AND OUTPUT RIPPLE VOLTAGE WAVEFORM (I OUT 400ns/div ...

Page 6

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator ( 1.8V 2A, Circuit of Figure OUT LOAD SOFT-START WAVEFORMS (PWM) (I OUT 200 µ s/div QUIESCENT CURRENT vs. INPUT VOLTAGE 100 V = ...

Page 7

Synchronous, Step-Down Switching Regulator ( 1.8V 2A, Circuit of Figure OUT LOAD SOFT-START WAVEFORMS (EXTERNAL REFIN) (PWM MODE) 200 µ s/div STARTING INTO A PREBIASED OUTPUT (I = 2A) OUT PWM ...

Page 8

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator ( 1.8V 2A, Circuit of Figure OUT LOAD CASE TEMPERATURE vs. AMBIENT TEMPERATURE 100 -20 -40 -40 -20 0 ...

Page 9

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator (BUMPS ON BOTTOM) BUMP NAME Analog Ground/Low-Side Switch Source Terminal. Connect to the PCB copper plane at one point near A1 GND the input bypass capacitor return terminal. Inductor Connection. Connect LX to ...

Page 10

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator SKIP EN BIAS EN LOGIC, IN UVLO GENERATOR THERMAL SHDN VOLTAGE REFERENCE STRONG PREBIASED FORCED START 0.58V SS/REFIN SS/REFIN BUFFER 0.6V ERROR AMPLIFIER FB COMP OSCILLATOR RAMP GEN 0.555V RISING, 0.527V FALLING 10 ...

Page 11

Synchronous, Step-Down Switching Regulator Detailed Description The MAX15053 high-efficiency, current-mode switching regulator can deliver output current. The MAX15053 provides output voltages from 0. from 2.7V to 5.5V input supplies, making the device ...

Page 12

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator A high-gain error amplifier provides accuracy for the voltage-feedback loop regulation. Connect the neces- sary compensation network between COMP and GND (see the Compensation Design Guidelines section). The error-amplifier transconductance is 1.5mS (typ). ...

Page 13

Synchronous, Step-Down Switching Regulator FEEDBACK ERROR AMPLIFIER DIVIDER V OUT OUT MV A VEA (dB)/ OUT REF *NOTE OPTIONAL AND DESIGNED TO EXTEND THE FF REGULATOR’S ...

Page 14

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator capacitor’s ESL. Estimate the output-voltage ripple due to the output capacitance, ESR, and ESL as follows:    OUT OUT ∆ × 1 − × R   ...

Page 15

Synchronous, Step-Down Switching Regulator t is the time needed for inductor current to reach the OFF1 zero-current crossing limit (~ 0A × SKIP LIMIT − OFF1 V OUT During t and t , the output capacitor ...

Page 16

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator 1ST ASYMPTOTE -1 A VEA (dB)/20 R2 × (R1 + R2) × 10 2ND ASYMPTOTE -1 R2 × (R1 + R2) × GAIN 3RD ASYMPTOTE R2 × (R1 + R2) (2GC ...

Page 17

Synchronous, Step-Down Switching Regulator The effect of the inner current loop at higher frequen- cies is modeled as a double-pole (complex conjugate) frequency term, G (s), as shown: SAMPLING ( ) = G s SAMPLING ...

Page 18

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator ( )   − −  LOAD S   ×  × × g ...

Page 19

Synchronous, Step-Down Switching Regulator INPUT 2. 22µF R PULL 20kI ON ENABLE OFF C SS 22nF Figure 5. Application Circuit for PWM Mode Operation Power Dissipation The MAX15053 is available in a 9-bump WLP package and ...

Page 20

High-Efficiency, 2A, Current-Mode Synchronous, Step-Down Switching Regulator INPUT 2. 22µF R PULL 20kI ON ENABLE OFF C SS 22nF Figure 6. Application Circuit for Skip Mode Operation Chip Information PROCESS: BiCMOS 20 _____________________________________________________________________________________ L OUT 1µH ...

Page 21

... 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 2011 Maxim Integrated Products © ...

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