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STMicroelectronics Electronic Components Datasheet

L6751B Datasheet

Digitally controlled dual PWM

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L6751B
Digitally controlled dual PWM for Intel VR12 and AMD SVI
Features
VR12 compliant with 25 MHz SVID bus rev1.5
– SerialVID with programmable IMAX,
TMAX, VBOOT, ADDRESS
AMD SVI compliant
Second generation LTB Technology®
Flexible driver/DrMOS support
JMode support
Fully configurable through PMBus
Dual controller:
– up to 6 phases for CORE and memory
– 1 phase for graphics (GFX), system agent
(VSA) or Northbridge (VDDNB)
Single NTC design for TM, LL and Imon
thermal compensation (for each section)
VFDE and GDC - gate drive control for
efficiency optimization
DPM - dynamic phase management
Dual remote sense; 0.5% Vout accuracy
Full-differential current sense across DCR
AVP - adaptive voltage positioning
Dual independent adjustable oscillator
Dual current monitor
Pre-biased output management
Average and per-phase OC protection
OV, UV and FB disconnection protection
Dual VR_RDY
VFQFPN68 8x8 mm package
Applications
High-current VRM / VRD for desktop / server /
workstation Intel / AMD CPUs
DDR3 memory supply
Datasheet production data
QFN68 8x8 mm
Description
The L6751B is a universal digitally controlled dual
PWM DC-DC designed to power Intel’s VR12 and
AMD SVI processors and memories: all required
parameters are programmable through dedicated
pinstrapping and PMBus interface.
The device features up to 6-phase programmable
operation for the multi-phase section and a single-
phase with independent control loops. When
configured for memory supply, single-phase
(VTT) reference is always tracking multi-phases
(VDDQ) scaled by a factor of 2. The L6751B
supports power state transitions featuring VFDE,
programmable DPM and GDC maintaining the
best efficiency over all loading conditions without
compromising transient response. The device
assures fast and independent protection against
load overcurrent, under/overvoltage and feedback
disconnections.
The device is available in VFQFPN68 8x8 mm
package.
Table 1. Device summary
Order code
Package
L6751B
L6751BTR
VFQFPN68 8x8 mm
Packaging
Tray
Tape and reel
December 2012
This is information on a product in full production.
Doc ID 024028 Rev 1
1/58
www.st.com
58


STMicroelectronics Electronic Components Datasheet

L6751B Datasheet

Digitally controlled dual PWM

No Preview Available !

Contents
Contents
L6751B
1 Typical application circuit and block diagram . . . . . . . . . . . . . . . . . . . . 6
1.1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Pin description and connection diagram . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Device configuration and pinstrapping tables . . . . . . . . . . . . . . . . . . . 20
4.1 JMode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2 Programming HiZ level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5 Device description and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6 Output voltage positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1 Multi-phase section - phase # programming . . . . . . . . . . . . . . . . . . . . . . 29
6.2 Multi-phase section - current reading and current sharing loop . . . . . . . . 29
6.3 Multi-phase section - defining load-line . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.4 Single-phase section - disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.5 Single-phase section - current reading . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.6 Single-phase section - defining load-line . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.7 Dynamic VID transition support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.7.1 LSLESS startup and pre-bias output . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.8 DVID optimization: REF/SREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7 Output voltage monitoring and protection . . . . . . . . . . . . . . . . . . . . . . 34
7.1 Overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.2 Overcurrent and current monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.2.1 Multi-phase section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2/58 Doc ID 024028 Rev 1


Part Number L6751B
Description Digitally controlled dual PWM
Maker STMicroelectronics
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L6751B Datasheet PDF






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