MAX20730

Part: MAX20730 — Maxim Integrated

Type: Integrated Synchronous Buck Switching Regulator with PMBus

Description: 4.5–16 V input, up to 25 A, single-chip step-down regulator with 0.6–5.5 V output, PMBus telemetry and 90.8% peak efficiency (VDDH = 12 V, VOUT = 1 V).

Operating Conditions:

• Supply voltage (VDDH): 4.5–16 V
• Junction temperature: -40 to +125 °C
• Output voltage range: 0.6–5.5 V (requires VDDH > VOUT + 2 V for regulation)
• Switching frequency: 400–900 kHz (programmable)

Absolute Maximum Ratings:

• VDDH pin voltage: -0.3 to +18 V
• Switching node (VX) DC: -0.3 to +18 V; 25 ns transient: -10 to +23 V
• Maximum average input current (IVDDH): 6 A
• Maximum average output current (IOUT): 25 A
• Peak output current: 50 A
• Junction temperature: +150 °C
• Storage temperature: -65 to +150 °C

Key Specs:

• VREF tolerance: ±1.0% (referred to VSENSE+/- pins)
• Switching frequency accuracy: ±20%
• VDDH UVLO: rising 4.25–4.47 V, falling 3.7–3.9 V, hysteresis 350 mV
• Positive OCP (valley current): 13.0 A typ (setting 0) to 23.6 A typ (setting 3)
• Overtemperature protection: 150 °C default (130 °C selectable), 10 °C hysteresis
• Line regulation ±0.2%; static load regulation ±0.7% (system level)
• Efficiency (VDDH = 12 V, VOUT = 1 V): 90.8% peak, 84.8% at 25 A
• Telemetry: VDDH ±3%, IOUT ±3 A, temperature ±8 °C; PMBus clock up to 400 kHz
• Thermal resistance: θJA 16.3 °C/W, θJC 0.62 °C/W (four-layer board)

Features:

• Overall solution size of 509 mm² including inductor and output capacitors
• Fast transient response, supports up to 300 A/μs load steps
• PMBus-compliant interface for voltage, current and temperature reporting
• Programmable via PMBus or resistor/capacitor on a dedicated programming pin
• Differential remote sense with open-circuit detection
• Positive and negative cycle-by-cycle and hiccup overcurrent protection
• Programmable thermal shutdown
• Input undervoltage lockout and status output pin

Applications:

• Communications equipment
• Networking equipment
• Servers and storage equipment
• Point-of-load voltage regulators
• μP chipsets
• Memory VDDQ
• I/O

Package:

• P154A6F+1 (outline 21-100020)

• High Power Density and Low Component Count
• Overall Solution Size 509mm 2 Including Inductor and Output Capacitors
• 90.8% Peak Efficiency with V DDH = 12V and V OUT = 1V
• Fast Transient Response: Supports Up to 300A/μs Load-Step Transients
• Optimized Component Performance and Efficiency with Reduced Design-In Time
• PMBus-Compliant Interface for Telemetry and Power Management
• Voltage, Current, and Temperature Reporting through the Digital Bus
• Increased Power-Supply Reliability with System and IC Self-Protection Features
• Differential Remote Sense with Open-Circuit Detection
• Hiccup Overcurrent Protection
• Programmable Thermal Shutdown

• Communications Equipment
• Networking Equipment
• Servers and Storage Equipment
• Point-of-Load Voltage Regulators
• μP Chipsets
• Memory VDDQ
• I/O

• For specific operating conditions, refer to the SOA curves in the Typical Operating Characteristics section.

(Circuit of Figure 6, V DDH = 4.5V to 16V, T A = +32°C, unless otherwise noted. Typical values are at T A = +32°C. All devices 100% tested at room temperature. Limits over temperature guaranteed by design.)

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Switching Node Voltage (VX) DC ..........................-0.3V to +18V

Switching Node Voltage (VX) 25ns (Note 2) ..........-10V to +23V

(BST - VX) Pin Differential ...................................-0.3V to +2.5V

Junction Temperature (T J ) ...............................................+150°C

Storage Temperature Range ............................ -65°C to +150°C

Peak Reflow Temperature Lead-Free .............................+260°C

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.

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . Note that a '+', '#', or '-' in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

Note 1: As measured at the V DDH pin referenced to GND pin immediately adjacent using a high-frequency scope probe with I LOAD at I MAX . A high-frequency input bypass capacitor must be located less than 60 mils from the V DDH pin per our design guidelines.

Note 2: The 25ns rating is the allowable voltage on the VX node in excess of the -0.3V to +18V DC ratings. The VX voltage may exceed the DC rating in either the positive or negative direction for up to 25ns per cycle.

Note 3: See the Average Input Current Limit section.

Note 4: Data taken using Maxim's evaluation kit (MAX20730EVKIT#). The PCB has four layers of 2oz copper.

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