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Datasheet> All Categories > Power/power management> The power supply circuit> L6716Q
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L6716Q

Description
2/3/4 phase controller with embedded drivers for Intel VR11.1
CategoryPower/power management    The power supply circuit   
File Size823KB，57 Pages
ManufacturerSTMicroelectronics
Websitehttp://www.st.com/
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L6716Q Overview

2/3/4 phase controller with embedded drivers for Intel VR11.1

L6716Q Parametric

Parameter NameAttribute value
Brand NameSTMicroelectronics
MakerSTMicroelectronics
Reach Compliance Codecompliant

L6716Q Preview

L6716
2/3/4 phase controller with embedded drivers for Intel
®
VR11.1
Features
■
■
■
■
■
■
■
Load transient boost LTB Technology™ to
minimize the number of output capacitors
2 or 3-phase operation with internal driver
4-phase operation with external PWM driver
signal
PSI input with programmable strategy
Imon output
0.5% output voltage accuracy
8-bit programmable output up to 1.60000 V -
Intel VR11.1 DAC - backward compatible with
VR10/VR11
Full differential current sense across inductor
Differential remote voltage sensing
Adjustable voltage offset
LSLess startup to manage pre-biased output
Feedback disconnection protection
Preliminary overvoltage protection
Programmable overcurrent protection
Programmable overvoltage protection
Adjustable switching frequency
SS_END and OUTEN signal
VFQFPN-48 7x7 mm package with exposed
pad
VFQFPN-48 - 7 x 7 mm
Description
The device implements a two-to-four phases step-
down controller with three integrated high current
drivers in a compact 7x7 mm body package with
exposed pad.
Load transient boost LTB Technology™ reduces
system cost by providing the fastest response to
load transition therefore requiring less bulk and
ceramic output capacitors to satisfy load transient
requirements.
The device embeds VR11.x DACs: the output
voltage ranges up to 1.60000 V managing D-VID
with ±0.5% output voltage accuracy over line and
temperature variations.
The controller assures fast protection against load
overcurrent and under / overvoltage (in this last
case also before UVLO). Feedback disconnection
prevents from damaging the load in case of
disconnections in the system board.
In case of overcurrent, the system works in
constant current mode until UVP.
■
■
■
■
■
■
■
■
■
■
■
Applications
■
■
High current VRM/VRD for desktop / server /
workstation CPUs
High density DC/DC converters
Device summary
Order codes
L6716
Table 1.
Package
VFQFPN-48
Packing
Tray
Tape and reel
L6716TR
January 2010
Doc ID 14521 Rev 3
1/57
www.st.com
57
Contents
L6716
Contents
1
Principle application circuit and block diagram . . . . . . . . . . . . . . . . . . . 4
1.1
1.2
Principle application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
Pin description and connection diagram . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1
3.2
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5
6
7
8
9
10
11
Voltage identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
DAC and Phase number selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Current reading and current sharing loop . . . . . . . . . . . . . . . . . . . . . . 23
Differential remote voltage sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Voltage positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
11.1
11.2
Offset (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Droop function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
12
13
14
2/57
Droop thermal compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Output current monitoring (IMON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Load transient boost technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Doc ID 14521 Rev 3
L6716
Contents
15
16
17
Dynamic VID transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Enable and disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
17.1
Low-side-less startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
18
Output voltage monitor and protections . . . . . . . . . . . . . . . . . . . . . . . . 39
18.1
18.2
18.3
18.4
18.5
Undervoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Preliminary overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Overvoltage and programmable OVP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Feedback disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
19
20
21
22
23
Low power state management and PSI# . . . . . . . . . . . . . . . . . . . . . . . . 44
Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Driver section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
System control loop compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Tolerance band (TOB) definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
23.1
23.2
23.3
23.4
Controller tolerance (TOBController) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
External current sense circuit tolerance (TOBCurrSense) . . . . . . . . . . . . 50
Time constant matching error tolerance (TOBTCMatching) . . . . . . . . . . . 50
Temperature measurement error (VTC) . . . . . . . . . . . . . . . . . . . . . . . . . . 51
24
Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
24.1
24.2
Power components and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Small signal components and connections . . . . . . . . . . . . . . . . . . . . . . . 53
25
26
27
Embedding L6716 - based VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Doc ID 14521 Rev 3
3/57
Principle application circuit and block diagram
L6716
1
1.1
Principle application circuit and block diagram
Principle application circuit
Figure 1.
V
IN
GND
IN
42 VCCDR
BOOT1
1
V
IN
C
IN
to BOOT3
Principle application circuit for VR11.1 - 2 phase operation
(a)
L
IN
to BOOT1
5V
SB
Optional:Pre-OVP
UGATE1
V
cc
3 VCC
48
HS1
L1
PHASE1
47
2 SGND
LGATE1 45
LS1
R
R
OVP
R
OCSET
R
OFFSET
R
LTBGAIN
12
13
11
C
OVPSEL
CS1-
OCSET/PSI_A
CS1+
OFFSET
BOOT2
39
18
17
Rg
220nF
10 LTBGAIN
R
OSC_SGND
14
To Vcc
R
OSC_VCC
OSC/FAULT
UGATE2
40
PHASE2
R
SS_FLIM
15
SSOSC
LGATE2
R
SSOSC
Optional:
See DS
41
44
D
R
FLIMT
CS2-
20
19
Rg
220nF
Vcc_core
10k
VTT
SS_END
1k
VID bus from CPU
Q
L6716
CS2+
35 SSEND
33
32
31
30
29
28
27
26
BOOT3
36
V
IN
C
OUT
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
R
OUT
LOAD
UGATE3
37
HS3
GND_core
L3
PHASE3
38
43
To CPU
To Enable circuitry
+3V3
R
IMON_OS
R
1
34 PSI
16 OUTEN
LGATE3
LS3
R
C
9 IMON
CS3-
CI
MON
CS3+
22
21
Rg
220nF
R
IMON_TOT
R
2
R
3
To GND CORE
8 LTB
C
LTB
4 COMP
NTC
25
R
LTB
C
P
C
F
R
F
5
R
FB1
C
I
PWM4 /
PH_SEL
FB
R
FB
R
FB2
R
I
R
FB3
NTC
6
7
VSEN
FBG
CS4-
CS4+
24
23
Rg
220nF
PGND
49
L6716 REF.SCH:
2Phase Operation
a. Refer to the application note for the reference schematic.
4/57
Doc ID 14521 Rev 3
L6716
Figure 2.
V
IN
GND
IN
42 VCCDR
BOOT1
Principle application circuit and block diagram
Principle application circuit for VR11.1- 3 phase operation
(b)
L
IN
to BOOT1
to BOOT2
1
V
IN
C
IN
to BOOT3
5V
SB
Optional:Pre-OVP
UGATE1
V
cc
3 VCC
48
HS1
L1
PHASE1
47
2 SGND
LGATE1 45
LS1
R
R
OVP
R
OCSET
R
OFFSET
R
LTBGAIN
12
13
11
C
OVPSEL
CS1-
OCSET/PSI_A
CS1+
18
17
Rg
220nF
OFFSET
10 LTBGAIN
BOOT2
39
V
IN
R
OSC_SGND
14
To Vcc
R
OSC_VCC
OSC/FAULT
UGATE2
40
HS2
L2
PHASE2
R
SS_FLIM
15
SSOSC
LGATE2
R
SSOSC
Optional:
See DS
41
44
LS2
R
C
R
FLIMT
CS2-
20
19
Rg
220nF
Vcc_core
BOOT3
36
V
IN
D
10k
VTT
SS_END
1k
VID bus from CPU
Q
L6716
CS2+
35 SSEND
33
32
31
30
29
28
27
26
C
OUT
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
R
OUT
LOAD
UGATE3
37
HS3
GND_core
L3
PHASE3
38
43
To CPU
To Enable circuitry
+3V3
R
IMON_OS
R
1
34 PSI
16 OUTEN
LGATE3
LS3
R
C
9 IMON
CS3-
CI
MON
CS3+
22
21
Rg
220nF
R
IMON_TOT
R
2
R
3
To GND CORE
8 LTB
C
LTB
4 COMP
NTC
25
R
LTB
C
P
C
F
R
F
5
R
FB1
C
I
PWM4 /
PH_SEL
FB
R
FB
R
FB2
R
I
R
FB3
NTC
6
7
VSEN
FBG
CS4-
CS4+
24
23
Rg
220nF
PGND
49
L6716 REF.SCH:
3-Phase Operation
b. Refer to the application note for the reference schematic.
Doc ID 14521 Rev 3
5/57
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L6716Q Related Products

L6716Q L6716QTR
Description 2/3/4 phase controller with embedded drivers for Intel VR11.1 2/3/4 phase controller with embedded drivers for Intel VR11.1
Brand Name STMicroelectronics STMicroelectronics
Maker STMicroelectronics STMicroelectronics
Reach Compliance Code compliant compliant

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