L6701TR STMicroelectronics, L6701TR Datasheet - Page 4

• Manufacturer Part Number: L6701TR
• Description: IC CTRLR 3PH VR10/9/K8 PWRSSO-36
• Manufacturer: STMicroelectronics

Specifications of L6701TR

• Applications: Controller, Intel VR9, VR10, K8
• Voltage - Input: 12V
• Number Of Outputs: 3
• Voltage - Output: 0.8 ~ 1.85 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 36-PowerSOIC
• Output Voltage: 0.8 V to 1.85 V
• Output Current: 1.5 A
• Switching Frequency: 110 KHz
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6108-2

1 Device Description
1
4/44
Device Description
L6701 is multi-phase PWM controller with embedded high-current drivers that provides
complete control logic and protections for a high-performance step-down DC-DC voltage
regulator, optimized for advanced microprocessor power supply. Multi-phase buck is the
simplest and most cost-effective topology employable to satisfy the increasing current demand
of newer microprocessors and the modern high-current DC/DC converters and POLs
requirements. It allows distributing equally load and power between the phases using smaller,
cheaper and most common external power MOSFETs and inductors. Moreover, thanks to the
equal phase-shift between each phase, the input and output capacitor count results in being
reduced. Phase-interleaving causes in fact input rms current and output ripple voltage
reduction and shows an effective output switching frequency increase: the 100kHz free-running
frequency per phase, externally adjustable through a resistor, results multiplied on the output
by the number of phases so reaching 300kHz in free-running.
L6701 includes multiple DACs, selectable through an apposite pin, allowing compatibility with
both Intel VR9, VR10 and AMD Hammer specifications, also performing D-VID transitions
accordingly. In particular for Intel CPUs, it allows to automatically recognize the CPU with a
single-wire connection, without any additional external component, by proper connecting the
selector pin to the proper CPU pin.
Precise voltage positioning (LL) is possible thanks to an accurate fully-differential current-sense
across the main inductors still using only two pins for current-reading (pat. pend.): this makes
any BOM insensitive to the board layout saving time in the design stage.
The device internally balance the current driven by each phase by sensing the voltage drop
across the LS MOSFET R
causing the device to work in constant-current mode.
The controller provides output voltage protections to avoid any load damage due to failed
components and/or feedback misconnections. Over-Voltage protects the load from dangerous
over stress latching immediately the device by turning-on the lower driver and driving high the
FAULT pin. Furthermore, preliminary-OVP protection also allows the device to protect the load
from dangerous OVP when V
causes the device to stop switching when set while Over-Current protection, with a threshold
for each phase, causes the device to enter in constant current mode until the latched UVP.
L6701 implements soft-start increasing the reference up to the final value in 2048 clock cycles
in closed loop regulation. Low-Side-Less feature allows the device to perform soft-start over
pre-biased output avoiding dangerous current return through the main inductors as well as
negative spike at the load side.
The compact PowerSSO-36 package with exposed thermal pad allows dissipating the power to
drive the external MOSFET through the system board.
DS(on)
CC
. OC protection is effective with a threshold for each phase
is not above the UVLO threshold. Under-Voltage protection
L6701