Datasheet

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19-7030; Rev 4; 11/14 Maxim Integrated Products, Inc. 1

VT1697SB

SMART SLAVE IC WITH INTEGRATED CURRENT

AND TEMPERATURE SENSORS

The VT1697SB is a feature-rich smart slave IC designed to work

with Maxim’s seventh-generation masters to implement a high-

density multiphase voltage regulator. Up to six smart slave ICs,

plus a master IC, provide a compact synchronous buck converter

that includes accurate individual phase-current and temperature

reporting via SMBus/PMBus. This smart slave device includes

protection circuits for overtemperature, VX short, all power sup-

plies UVLO faults and main power supply OVLO fault. If a fault is

detected, the slave IC will immediately shut down and send a fault

signal to the master IC.

Monolithic integration and advanced packaging technologies allow

practical per-phase, high switching frequencies with significantly

lower losses than alternative implementations. Smart slave

devices are designed to support phase-shedding and DCM

modes for efficiency optimization over a wide range of load cur-

rents. High per-phase current-capability designs with low C

OUT

enable a design with fewer phases and a smaller footprint.

The VT1697SB is packaged in a QFN package with exposed top-

side thermal pads. Top-side cooling allows improved heat transfer

to ambient and reduces PC board and component temperatures.

Figure 1: Basic Application Circuit

FEATURES AND BENEFITS

• Increased Power Density with Fewer External Components

– Monolithic Integration For Reduced Parasitics

– 4-Phase Scalable Architecture Compatible with Coupled

Inductors

– 94% Peak Efficiency

– Top-Side Cooling For Improved Heat Transfer To Ambient

• Accurate Telemetry and Monitoring Provides Real-Time

Reporting of Critical Parameters

– PMBus Compliant Interface via Master Controller for Telemetry

and Power Management

– Junction Temperature Monitoring & Reporting

– Per-Phase Current Reporting

• Advanced Self-Protection Features Protects System and IC

– Overcurrent Protection

– Overtemperature Protection

– Boost Voltage UVLO

– VX Short Protection

APPLICATIONS

• Communication and Networking Equipment

• Servers and Storage Equipment

• High-Current Voltage Regulators

– Networking ASICs

– FPGAs

– Microprocessor Chipsets

– Memory

Device Type

Operating

Current

Input Voltage

VT1697SB 55A Per Phase 8.5V to 14.0V

Control1

SENSE

OUT

Control2

Control6

Sense+

Sense-

SENSE

SVID

SMBus

Multiphase

Master

VT1697SB

Summary of content (13 pages)

PAGE 1
VT1697SB SMART SLAVE IC WITH INTEGRATED CURRENT AND TEMPERATURE SENSORS Device Type Operating Current Input Voltage VT1697SB 55A Per Phase 8.5V to 14.0V FEATURES AND BENEFITS • The VT1697SB is a feature-rich smart slave IC designed to work with Maxim’s seventh-generation masters to implement a highdensity multiphase voltage regulator.
PAGE 2
VT1697SB Ordering Information Part Number Description Package Drawing Number Shipping Method Package Marking 2.5ku Tape & Reel VT1697SBF RoHS Compliant3 VT1697SBFQX 55A smart slave Device QFN-16 [Type G] ES AP-2896 ABSOLUTE MAXIMUM RATINGS1 OPERATING RATINGS Supply Voltage (12V) ........................................... -0.3V to 16V VDD, VCC.......................................................... 1.71V to 1.98V Supply & Input Pin Voltages (1.8V) .................... -0.3V to 2.
PAGE 3
VT1697SB Electrical Characteristics VDD = VCC = 1.71V - 1.98V, VDDH = 12V. The  symbol denotes specifications which apply over the following temperature range: TJ = 0 to 125°C, otherwise specifications are for TJ = 25°C. The # symbol denotes specifications which apply over the following temperature range: TJ = -25 to 125°C. Symbol Parameter Conditions Min Typ Max Units 1.98 V 12.0 14.0 V Supply Voltages , Supply Current VDD, VCC Bias Supply Voltage 1.71 VDDH Power Train Input Voltage 8.
PAGE 4
VT1697SB Typical Operating Characteristics Efficiency vs Load Current - 4 VT1697SB (VR12.0) Efficiency vs Load Current - 4 VT1697SB (VR12.5) 96% 94% 92% 90% 88% 86% 84% 82% 80% 96% 94% VOUT = 0.8V VOUT = 1.1V VOUT = 1.35V 0 20 40 60 Efficiency (%) Efficiency (%) Master: TA = 25°C; Fsw = 600kHz VOUT = 1.0V VOUT = 1.2V VOUT = 1.5V 92% 90% VOUT = 1.6V VOUT = 1.8V VOUT = 2.0V VOUT = 1.7V VOUT = 1.9V 88% 86% 80 100 120 140 160 180 0 IOUT (A) VOUT = 0.8V VOUT = 0.9V VOUT = 1.1V VOUT = 1.
PAGE 5
VT1697SB Typical Operating Characteristics Master: TA = 25°C; Fsw = 600kHz VT1697SB 4-Phase Safe Operating Area (Heatsink) VT1697SB 4-Phase Safe Operating Area (No Heatsink) 220 180 200LFM 25°C 200LFM 70°C 400LFM 55°C No Airflow 25°C 210 200 190 200LFM 55C 400LFM 25°C 400LFM 70°C 160 200LFM 55°C 400LFM 25°C 400LFM 70°C 150 170 IOUT (A) IOUT (A) 180 160 150 140 130 140 130 120 120 110 110 100 100 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 VOUT (V) Conditions: VIN = 12V VBIAS = 1.
PAGE 6
VT1697SB VDDH VSS VSS VSS VSS TS_FAULTB ISENSE GND PWM VDD VCC Pinout and Block Diagrams 16 15 14 13 12 11 1 10 BST 9 VX 8 VX 7 VX 6 VX 2 3 4 5 Top View Figure 2: VT1697SB Pinout (QFN-16) PIN INFORMATION FOR VT1697SB SMART SLAVE DEVICE VDDH (Pin 1): 12V input supply voltage node. This node connects to the 12V input power supply source. High-frequency decoupling capacitors must be placed in close proximity to the slave IC on the same side as the VT1697SB.
PAGE 7
VT1697SB Pinout and Block Diagrams VCC CBOOST UVLO VDD UVLO VDD PWM VDDH BST Top Switch VX Short Detect Control/ Fault Logic Level Shift/ Switch Drivers OCP Clamp Level Detect VX VDDH OVLO/UVLO TS_FAULTB Current Sense/ Reconstruction Temperature Sense ISENSE Figure 3: IC Block Diagram 7 Maxim Integrated Products, Inc.
PAGE 8
VT1697SB Theory of Operation VOLTAGE REGULATION Maxim smart slave ICs provide the control logic, drivers, monitoring circuits and power semiconductors for a synchronous buck converter with fault protection, status monitoring and accurate lossless current sensing. Phases are controlled by the Master IC independently by separate phase control signals. Power Switch Control and Drivers The smart slave ICs operate in conjunction with a Maxim Master IC.
PAGE 9
VT1697SB Theory of Operation VIN (VDDH) Undervoltage and Overvoltage Lockout VX Short Protection The slaves include protection circuits that shut down the slave and assert TS_FAULTB if VDDH is above or below the correct operating range. If either of these circuits is tripped during operation, the slave will stop switching and a fault signal (TS_FAULTB pulled LOW) will be sent to the master.
PAGE 10
VT1697SB Theory of Operation DESIGN CONSIDERATIONS Phase Current Sharing and Steering Control Maxim master/slave chipsets offer options for thermal balancing in applications where one or more phases have different thermal characteristics. The current sense and chipset regulation system offer the potential for current steering, where a percentage of current can be steered away from any phase, allowing that phase to operate at a different current than the other phases.
PAGE 11
VT1697SB Package Dimensions Title: Doc No. Package Outline - 16 Lead QFN [Type G] ES AP-2896 Page 1 of 3 11 Maxim Integrated Products, Inc. Rev.
PAGE 12
VT1697SB Package Dimensions Title: Doc No. Package Outline - 16 Lead QFN [Type G] ES AP-2896 Page 2 of 3 12 Maxim Integrated Products, Inc. Rev.
PAGE 13
VT1697SB Revision History REVISION HISTORY Revision Description Date 0 Initial Data Sheet N/A 1 Changed Status of VT1697SB to New Product. Updated ICC + IDD, VBST_UVLO and NOCP specifications in the Electrical Characteristics table. 1/14 Made a change in the “filter” (from VDDH to VDD) in Table 2. 2 Updated to Maxim Template 2/14 3 Updated Electrical Characteristics Table and Overcurrent Protection section. Updated Operating Current Rating to 55A.