Rainbow Electronics MAX17480 - Manual

General Description
The MAX17480 is a triple-output, step-down, fixed-
frequency controller for AMD’s serial VID interface (SVI)
CPU and northbridge (NB) core supplies. The MAX17480
consists of two high-current SMPSs for the CPU cores
and one 4A internal switch SMPS for the NB core. The
two CPU core SMPSs run 180
° out-of-phase for true
interleaved operation, minimizing input capacitance.
The 4A internal switch SMPS runs at twice the switching
frequency of the core SMPS, reducing the size of the
external components.
The MAX17480 is fully AMD SVI compliant. Output volt-
ages are dynamically changed through a 2-wire SVI,
allowing the SMPSs to be individually programmed to
different voltages. A slew-rate controller allows con-
trolled transitions between VID codes and controlled
soft-start. SVI also allows each SMPS to be individually
set into a low-power pulse-skipping state.
Transient phase repeat improves the response of the
fixed-frequency architecture, reducing the total output
capacitance for the CPU core. A thermistor-based tem-
perature sensor provides a programmable thermal-fault
output (VRHOT).
The MAX17480 includes output overvoltage protection
(OVP), undervoltage protection (UVP), and thermal pro-
tection. When any of these protection features detect a
fault, the controller shuts down. True differential current
sensing improves current limit and load-line accuracy.
The MAX17480 has an adjustable switching frequency,
allowing 100kHz to 600kHz operation per core SMPS,
and twice that for the NB SMPS.
Applications
Mobile AMD SVI Core Supplies
Multiphase CPU Core Supplies
Voltage-Positioned, Step-Down Converters
Notebook/Desktop Computers
Features
♦ Dual-Output Fixed-Frequency Core Supply
Controller
Split or Combinable Outputs Detected at
Power-Up
Dynamic Phase Selection Optimizes
Active/Sleep Efficiency
Transient Phase Repeat Reduces Output
Capacitance
True Out-of-Phase Operation Reduces Input
Capacitance
Programmable AC and DC Droop
Accurate Current Balance and Current Limit
Integrated Drivers for Large Synchronous-
Rectifier MOSFETs
Programmable 100kHz to 600kHz Switching
Frequency
4V to 26V Battery Input Voltage Range
♦ 4A Internal Switch Northbridge SMPS
2.7V to 5.5V Input Voltage Range
2x Programmable Switching Frequency
75m Ω/40mΩ Power Switches
♦ ±0.5% V
OUT Accuracy over Line, Load, and
Temperature
♦ AMD SVI-Compliant Serial Interface with
Switchable Address
♦ 7-Bit On-Board DAC: 0 to +1.550V Output Adjust
Range
♦ Integrated Boost Switches
♦ Adjustable Slew-Rate Control
♦ Power-Good (PWRGD) and Thermal-Fault
(
VRHOT) Outputs
♦ System Power-OK (PGD_IN) Input
♦ Overvoltage, Undervoltage, and Thermal-Fault
Protection
♦ Voltage Soft-Startup and Passive Shutdown
♦ < 1µA Typical Shutdown Current
MAX17480
AMD 2-/3-Output Mobile Serial
VID Controller
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-4443; Rev 0; 2/09
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.
PART TEMP RANGE PIN-PACKAGE
MAX17480GTL+ -40 °C to +105°C 40 TQFN-EP*
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
Pin Configuration appears at end of data sheet.