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19-5110; Rev 0; 1/10
TION KIT EVALUA BLE IL AVA A
Triple-Output Buck Controllers with Tracking/Sequencing
Features
S 4.7V to 23V or 5V ±10% Input Voltage Range S Triple-Output Synchronous Buck Controllers with 120° Out-of-Phase Operation S Prebias Power-Up (MAX15049) S Output Voltage Adjustable Down to 0.6V S Coincident/Ratiometric Tracking (MAX15048) S Accurate Sequencing Through Enable Threshold (MAX15049) S External Compensation for Maximum Flexibility S Digital Soft-Start (MAX15048/MAX15049) and SoftStop (MAX15048) S Lossless Valley-Mode Current Sensing Using RDS(ON) of the Low-Side MOSFET S PGOOD Output S Integrated Bootstrap Diodes S Programmable Switching Frequency from 200kHz to 1.2MHz S Thermal Shutdown and Hiccup Mode Short-Circuit Protection S Space-Saving (5mm x 5mm), 32-Pin TQFN Package
PART MAX15048ETJ+ MAX15049ETJ+ TEMP RANGE -40NC to +85NC -40NC to +85NC PIN-PACKAGE 32 TQFN-EP* 32 TQFN-EP*
General Description
The MAX15048/MAX15049 are triple-output pulse-width modulated (PWM), step-down, DC-DC controllers with tracking (MAX15048) and sequencing (MAX15049) options. The devices operate over the 4.7V to 23V inputvoltage range. Each PWM controller provides an adjustable output down to 0.6V and delivers up to 15A of load current with excellent load and line regulation. The MAX15049 can start into prebiased outputs. The MAX15048/MAX15049 are optimized for high-performance, small-size powermanagement solutions. The options of coincident or ratiometric tracking (MAX15048) or output sequencing (MAX15049) allow the tailoring of the power-up/power-down sequence depending on the system requirements. Each of the MAX15048/MAX15049 PWM sections utilizes a voltage-mode control scheme with external compensation, allowing for good noise immunity and maximum flexibility with a wide selection of inductor values and capacitor types. Each PWM section operates at the same fixed switching frequency that is programmable from 200kHz to 1.2MHz. Each converter, operating at up to 1.2MHz with 120N out-of-phase, increases the input capacitor ripple frequency up to 3.6MHz, reducing the RMS input ripple current and thus the size of the input bypass capacitor significantly. The MAX15048/MAX15049 integrate boost diodes for additional system cost savings. The MAX15048/MAX15049 include internal undervoltage lockout (UVLO) with hysteresis and digital soft-start (MAX15048/MAX15049)/soft-stop (MAX15048) for glitchfree power-up and power-down of the converter. The power-good circuitry (PGOOD) monitors all three outputs and provides a power-good signal to the system control/ processor when all outputs are within regulation. Protection features include lossless valley-mode current limit, hiccup mode output short-circuit protection, and thermal shutdown. The MAX15048/MAX15049 are available in space-saving, 5mm x 5mm, lead-free, 32-pin TQFN-EP packages and are specified for operation over the -40NC to +85NC extended temperature range.
MAX15048/MAX15049
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
Simplified Typical Operating Circuit (Coincident Tracking)
VOUT2
IN
IN
COMP2
PGND2
BST2
DH2
DL2
EN2
EN1 IN DH1
DH3 VOUT3 LX3 BST3 DL3 PGND3 FB3 VOUT1 COMP3 LX1
LX2
FB2
IN
VOUT1
Applications
Point-of-Load DC-DC Converters ASIC/CPU/DSP Core and I/O Voltages DDR Power Supply Base-Station Power Supplies Telecom and Networking Power Supplies RAID Control Power Supplies Set-Top Boxes
MAX15048
BST1 DL1
PGND1 FB1
PGOOD
SGND
RT
VREG VOUT1 VOUT2 VOUT3 SOFT-START SOFT-STOP
COINCIDENT TRACKING OUTPUTS
________________________________________________________________ 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.
Datasheet pdf - http://www.DataSheet4U.net/
REG
EN3
COMP1
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Triple-Output Buck Controllers with Tracking/Sequencing MAX15048/MAX15049
ABSOLUTE MAXIMUM RATINGS
IN, LX_ to SGND....................................................-0.3V to +30V BST_ to SGND. .......................................................-0.3V to +30V BST_ to LX_..............................................................-0.3V to +6V REG, DREG_, EN_, RT to SGND. .............................-0.3V to +6V PGOOD, FB_, COMP_ to SGND..............................-0.3V to +6V DL_ to PGND_......................................-0.3V to (VDREG_ + 0.3V) DH_ to LX_..............................................-0.3V to (VBST_ + 0.3V) PGND to SGND, PGND_ to Any Other PGND_. .........................................-0.3V to +0.3V Continuous Power Dissipation (TA = +70NC) 32-Pin TQFN (derate 34.5mW/NC above +70NC)....2758.6mW Junction-to-Case Thermal Resistance (BJC) (Note 1)......................................................................2NC/W Junction-to-Ambient Thermal Resistance (BJA) (Note 1).....................................