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L6713A
2/3 Phase controller with embedded drivers for Intel VR10, VR11
and AMD 6 bit CPUs
General features
Load transient boost (LTB) technology™ to
minimize the number of output capacitors
(patent pending)
■
Dual-edge asynchronous PWM
■
TQFP64 (Exposed Pad)
Selectable 2 or 3 phase operation
■
0.5% Output voltage accuracy
■
7/8 bit programmable output up to 1.60000V -
Intel VR10.x, VR11 DAC
■
Description
L6713A implements a two/three phase step-down
controller with 180º/120º phase-shift between
each phase with integrated high current drivers in
a compact 10x10mm body package with exposed
pad.The 2 or 3 phase operation can be easily
selected through PHASE_SEL pin.
6 bit programmable output up to 1.5500V -
AMD 6 bit DAC
■
High current Integrated gate drivers
■
Full differential current sensing across inductor
■
Embedded VRD thermal monitor
■
Differential remote voltage sensing
Load Transient Boost (LTB) Technology™ (Patent
Pending) reduces system cost by providing the
fastest response to load transition therefore
requiring less bulk and ceramic output capacitors
to satisfy load transient requirements.
■
Dynamic VID management
■
Adjustable voltage offset
■
Low-side-less startup
■
Programmable soft start
■
LTB Technology™ can be disabled and in this
condition the device works as a dual-edge
asynchronous PWM.
Programmable over voltage protection
■
Preliminary over voltage protection
■
The device embeds selectable DACs: the output
voltage ranges up to 1.60000V (both Intel VR10.x
and VR11 DAC) or up to 1.5500V (AMD 6BIT
DAC) managing D-VID with ±0.5% output voltage
accuracy over line and temperature variations.
Programmable over current protection
■
Adjustable switching frequency
■
Output enable
■
SS_END / PGOOD signal
■
The controller assures fast protection against load
over current and under / over voltage (in this last
case also before UVLO). In case of over-current
the device turns off all MOSFET and latches the
condition.
TQFP64 10x10mm package with exposed pad
■
Applications
High current VRD for desktop CPUs
■
Workstation and server CPU power supply
■
System Thermal Monitor is also provided allowing
system protection from over-temperature
conditions.
VRM modules
■
Order codes
Part number
Package
Packaging
L6713A
TQFP64 (Exposed Pad)
Tube
L6713ATR
TQFP64 (Exposed Pad)
Tape and reel
November 2006
Rev 2
1/64
www.st.com
64
Contents
L6713A
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5
VID Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1
Mapping for the Intel VR11 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2
Voltage identification (VID) for Intel VR11 Mode . . . . . . . . . . . . . . . . . . . 16
5.3
Voltage identifications (VID) for Intel VR10 Mode + 6.25mV . . . . . . . . . . 18
5.4
Mapping for the AMD 6BIT Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.5
Voltage identifications (VID) codes for AMD 6BIT Mode . . . . . . . . . . . . . 20
6
Reference Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7
Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8
Configuring the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1
Number of phases selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.2
DAC Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10
Current reading and current sharing loop . . . . . . . . . . . . . . . . . . . . . . 32
11
Differential remote voltage sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2/64
L6713A
Contents
12
Voltage positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
12.1
Offset (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
12.2
Droop function (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Load Transient Boost Technology
TM
. . . . . . . . . . . . . . . . . . . . . . . . . . . 37
13
13.1
LTB Gain mofidication (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
14
Dynamic VID transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
15
Enable and disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
16
Soft start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
16.1
Intel mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
16.1.1
SS/LTB/AMD connections when using LTB Gain = 2 . . . . . . . . . . . . . . . 43
16.1.2
SS/LTB/AMD connections when using LTB Gain < 2 . . . . . . . . . . . . . . . 44
16.2
AMD mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
16.3
Low-side-less startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
17
Output voltage monitor and protections . . . . . . . . . . . . . . . . . . . . . . . . 47
17.1
Under voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
17.2
Preliminary over voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
17.3
Over voltage and programmable OVP . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
17.4
PGOOD (only for AMD mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
18
Over current protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
19
Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
20
Driver section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
21
System control loop compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
22
Thermal monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3/64
Contents
L6713A
23
Tolerance band (TOB) definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
23.1
Controller tolerance (TOB
Controller
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
23.2
Ext. current sense circuit tolerance (TOB
CurrSense
) . . . . . . . . . . . . . . . . . 56
23.3
Time constant matching error tolerance (TOB
TCMatching
) . . . . . . . . . . . . . 56
23.4
Temperature measurement error (V
TC
) . . . . . . . . . . . . . . . . . . . . . . . . . . 57
24
Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
24.1
Power components and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
24.2
Small signal components and connections . . . . . . . . . . . . . . . . . . . . . . . 59
25
Embedding L6713A - based VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
26
Mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
27
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
4/64
L6713A
Block diagram
1
Block diagram
Figure 1.
Block diagram
VR_HOT
SS_END / PGOOD
HS1
LS1
HS2
LS2
HS3
LS3
VR_FAN
LOGIC PWM
ADAPTIVE ANTI
CROSS CONDUCTION
LOGIC PWM
ADAPTIVE ANTI
CROSS CONDUCTION
LOGIC PWM
ADAPTIVE ANTI
CROSS CONDUCTION
CURRENT SHARING
CORRECTION
CURRENT SHARING
CORRECTION
CURRENT SHARING
CORRECTION
OSC / FAULT
LT B
LT B
LT B
TM
PWM1
PWM2
PWM3
SS/ LTBG/ AMD
PWM1
PWM2
PWM3
CS1-
CS1+
CH1 CURRENT
READING
DIGITAL
SOFT START
VCC
L6713A
CONTROL LOGIC
AND PROTECTIONS
VCCDR
OCP
CS2-
CS2+
OUTEN
CH2 CURRENT
READING
SSOSC/AMD
VID0
VID1
VID2
VID3
VID4
VID5
VID6
CS3-
CS3+
CH3 CURRENT
READING
TOTAL DELIVERED CURRENT
+175mV / 1.800V / OVP
VCC
OVP
COMPARATOR
VCC
VID7 / D-VID
SGND
TO OCP
+.1240V
VID_SEL
VREF
GND DROP
RECOVERY
OCP
COMPARATOR
OUTEN
ERROR
AMPLIFIER
LT B
PHASE_SEL
OVP
5/64
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