MAX8809AETL+ Maxim Integrated Products, MAX8809AETL+ Datasheet

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MAX8809AETL+

Manufacturer Part Number
MAX8809AETL+
Description
VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8809AETL+

Dc
0644
19-3886; Rev 1; 8/06
VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM
Controllers with Integrated Dual MOSFET Drivers
General Description
The MAX8809A/MAX8810A synchronous, 2-/3-/4-
phase, step-down, current-mode controllers with inte-
grated dual-phase MOSFET drivers provide flexible
solutions that fully comply with Intel
and AMD K8 Rev F CPU core supplies. The flexible
design supplies load currents up to 150A for low-volt-
age CPU core power requirements.
A tri-state SEL input is available to configure the VID
logic for either the Intel VRD11/VRD10 or AMD K8 Rev F
applications. An enable input (EN) is available to dis-
able the IC. True-differential remote output-voltage
sensing enables precise regulation at the load by elimi-
nating the effects of trace impedance in the output and
return paths. A high-accuracy DAC combined with pre-
cision current-sense amplifiers and droop control
enable the MAX8809A/MAX8810A to meet the most
stringent tolerance requirements of new-generation
high-current CPUs. These ICs use either integral or volt-
age-positioning feedback control to achieve high out-
put-voltage accuracy.
The COMP input allows for either positive or negative
voltage offsets from the VID code voltage. A power-
good signal (VRREADY) is provided for startup
sequencing and fault annunciation. The SS/OVP pin
enables the programming of the soft-start period, and
provides an indication of an overvoltage condition. A
soft-stop feature prevents negative voltage spikes on
the output at turn-off, eliminating the need for an exter-
nal Schottky clamp diode.
The MAX8809A/MAX8810A incorporate a proprietary
“rapid active average” current-mode control scheme for
fast and accurate transient-response performance, as
well as precise load current sharing. Either the inductor
DCR or a resistive current-sensing element is used for
current sensing. When used with DCR sensing, rapid
2
active current averaging (RA
) eliminates the tolerance
effects of the inductance and associated current-sens-
ing components, providing superior phase current
matching, accurate current limit, and precise load-line.
The MAX8809A operates as a single-chip, 2-phase
solution with integrated drivers. It also provides a 3rd-
phase PWM output and easily supports 3-phase design
by adding the MAX8552 high-performance driver. The
MAX8810A enables up to 4-phase designs by adding
the MAX8523 high-performance dual driver for a com-
pact 2-chip solution.
Intel is a registered trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
♦ VRD11/VRD10 and K8 Rev F Compliant
♦ ±0.35% Initial Output Voltage Accuracy
♦ Dual Integrated Drivers with Integrated Bootstrap
®
VRD11/VRD10
Diodes
♦ Up to 26V Input Voltage
♦ Adaptive Shoot-Through Protection
♦ Soft-Start, Soft-Stop, VRREADY Output
♦ Fast Load Transient Response
♦ Individual Phase, Fully Temperature-
Compensated Cycle-by-Cycle Average Current
Limit
♦ Current Foldback at Short Circuit
♦ Voltage Positioning or Integral Feedback
♦ Differential Remote Voltage Sensing
♦ Programmable Positive and Negative Offset
Voltages
♦ 150kHz to 1.2MHz Switching Frequency per Phase
♦ NTC-Based, Temperature-Independent Load Line
♦ Precise Phase Current Sharing
♦ Programmable Thermal-Monitoring Output
(VRHOT)
♦ 6A Peak MOSFET Drivers
♦ 0.3Ω/0.85Ω Low-Side, 0.8Ω/1.1Ω High-Side
Drivers (typ)
♦ 40-Pin and 48-Pin Thin QFN Packages
Desktop PCs
Servers, Workstations
Desknote and LCD PCs
Voltage-Regulator Modules
PART
MAX8809AETL+
MAX8810AETM+
+Denotes lead-free package.
Note: All parts are specified in the -40°C to +85°C extended
temperature range.
Pin Configurations appear at end of data sheet.
Features
Applications
Ordering Information
PIN-
PKG
FUNCTION
PACKAGE
CODE
40 Thin QFN
T4055-1
2-/3-phase
5mm x 5mm
48 Thin QFN
T4866-1
2-/3-/4-phase
6mm x 6mm
1

Related parts for MAX8809AETL+

MAX8809AETL+ Summary of contents

Page 1

... Thin QFN Packages Desktop PCs Servers, Workstations Desknote and LCD PCs Voltage-Regulator Modules PART MAX8809AETL+ MAX8810AETM+ +Denotes lead-free package. Note: All parts are specified in the -40°C to +85°C extended temperature range. Pin Configurations appear at end of data sheet. ...

Page 2

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers ABSOLUTE MAXIMUM RATINGS REF, COMP, SS/OVP, OSC, NTC, VRTSET, RS+, RS-, PWM_ to GND.......................-0. CS_+, CS_-, VID_, BUF, EN, ILIM, SEL, VRREADY, VRHOT GND ...

Page 3

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers ELECTRICAL CHARACTERISTICS (continued 6.5V 5V, V VL_ BST_ CC EN 5kΩ pullup to 5V 12kΩ to GND, R ...

Page 4

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers ELECTRICAL CHARACTERISTICS (continued 6.5V 5V, V VL_ BST_ CC EN 5kΩ pullup to 5V 12kΩ to GND, R ...

Page 5

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers ELECTRICAL CHARACTERISTICS (continued 6.5V 5V, V VL_ BST_ CC EN 5kΩ pullup to 5V 12kΩ to GND, R ...

Page 6

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers ELECTRICAL CHARACTERISTICS ( 6.5V 5V, V VL_ BST_ CC EN 5kΩ pullup to 5V 12kΩ SS/OVP NTC ...

Page 7

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers ELECTRICAL CHARACTERISTICS (continued 6.5V 5V, V VL_ BST_ CC EN 5kΩ pullup to 5V 12kΩ SS/OVP ...

Page 8

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers ELECTRICAL CHARACTERISTICS (continued 6.5V 5V, V VL_ BST_ CC EN 5kΩ pullup to 5V 12kΩ SS/OVP ...

Page 9

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers (Circuit of Figure 14 12V OUT unless otherwise noted.) EFFICIENCY vs. LOAD CURRENT R = 130kΩ OSC 100 ...

Page 10

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers (Circuit of Figure 14 12V 1.35V OUT unless otherwise noted.) SOFT-START WAVEFORMS (AMD VRREADY V OUT VEN 1ms/div SHUTDOWN WAVEFORMS ...

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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers (Circuit of Figure 14 12V OUT unless otherwise noted.) BUF VOLTAGE vs. AMBIENT TEMPERATURE 1.10 1.05 1.00 0.95 0.90 -40 - ...

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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers (Circuit of Figure 14 12V 1.35V OUT unless otherwise noted.) VL_ POWER DISSIPATION vs. LOAD CAPACITANCE 400 350 300 250 200 150 ...

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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers (Circuit of Figure 14 12V OUT unless otherwise noted.) BST_ AND VL_ WAVEFORMS VL_ BST_ LX_ 500ns/div PIN NAME MAX8809A ...

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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers PIN NAME MAX8809A MAX8810A 9 11 OSC 10 12 SS/OVP 11 13 VRTSET 12 14 NTC 13 — CS3 CS3 CS2 CS12- ...

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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers PIN NAME MAX8809A MAX8810A 23 27 BST1 24 28 DL1 25 29 PGND1 26 — VL12 27 32 PGND2 28 33 DL2 29 34 BST2 30 35 LX2 ...

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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers PIN NAME MAX8809A MAX8810A — 4 BUF — 7, 10, 37, 47 N.C. — 15 CS4+ — 16 CS34- — 22 PWM4 — 30 VL1 — 31 VL2 ...

Page 17

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers CS1+ CS12- CS2+ CS3- (MAX8809A) CS3+ CS34- (MAX8810A) CS4+ (MAX8810A) 1V REF BUF + (MAX8810A COMP - VRREADY CURRENT FOLDBACK OVP COMPARATOR SOFT-START SS/OVP SOFT-STOP REF ...

Page 18

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers t fDL Figure 2. Driver Timing Diagram Detailed Description The MAX8809A/MAX8810A synchronous, 2-/3-/4- phase, step-down, current-mode controllers with inte- grated dual-phase MOSFET drivers provide flexible ...

Page 19

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Voltage Reference (REF) A precision 2V reference is provided by the MAX8809A/ MAX8810A at the REF output. REF is capable of sinking and sourcing up to 500µA for ...

Page 20

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers in a constant output current limit over the entire opera- tional temperature range. This eliminates the need to oversize MOSFETs and inductors to compensate for thermal effects. Connecting ...

Page 21

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers The DC gain of the voltage-error amplifier is equal From the previous equations it is clear MV COMP that the output-voltage droop can ...

Page 22

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers MAX8809A REF COMP Figure 8. Programming the Output Offset Voltage Load-Line Independent Inductor DC Resistance Temperature Compensation Changes in inductor ...

Page 23

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers When the driver supply voltage (V UVLO threshold (3.55V typ), DH_ and DL_ are held low above the UVLO threshold and while EN is low, ...

Page 24

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers SOFT-START RATE SET BY R OUT 6.25mV/STEP VRREADY EN 2ms TD1 Figure 10. K8 Rev F Startup Sequencing and Timing Table 2. AMD Startup Sequence Specifications M IN ...

Page 25

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers low. Once V is above the UVLO threshold and EN is VL_ low, DL_ is kept high and DH_ is kept low. This pre- vents the output from ...

Page 26

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 4. AMD K8 Rev F VID Code, SEL = UNCONNECTED VID5 VID4 VID3 VID2 VID1 ...

Page 27

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 5. Extended Intel VRD10 VID Code, SEL = GND VID6 VID5 VID4 VID3 VID2 ...

Page 28

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 5. Extended Intel VRD10 VID Code, SEL = GND (continued) VID6 VID5 VID4 VID3 VID2 VID1 ...

Page 29

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 6. Intel VRD11 VID Code, SEL = V VID7 VID6 VID5 ...

Page 30

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 6. Intel VRD11 VID Code, SEL = V VID7 VID6 VID5 ...

Page 31

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 6. Intel VRD11 VID Code, SEL = V VID7 VID6 VID5 ...

Page 32

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 6. Intel VRD11 VID Code, SEL = V VID7 VID6 VID5 ...

Page 33

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 6. Intel VRD11 VID Code, SEL = V VID7 VID6 VID5 ...

Page 34

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers where f is given in MHz and R OSC see the Per-Phase Frequency vs. R Typical Operating Characteristics for the relationship between the clock frequency and the value ...

Page 35

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Use the maximum input voltage for calculating the duty cycle to obtain the worst-case RMS ripple current. R and R are the on-state resistances DSON_LS DSON_HS of the ...

Page 36

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers where M is the number of MOSFETs in parallel per LS phase on the low side. Total power dissipation for the low side equals the number of phases ...

Page 37

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers This simplified transfer function ignores a double pole due to the current-mode sampling effect, which can be approximately placed at 1/2 the per-phase switching frequency rule-of-thumb, ...

Page 38

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers where g is the transconductance of the error amplifi and capacitor placed from the output of COMP the error amplifier (COMP) to GND. ...

Page 39

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Applications Information PC Board Layout Guidelines A properly designed PC board layout is important in any switching DC-DC converter circuit. Mount the MOSFETs, inductors, input/output capacitors, and cur- ...

Page 40

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Figure 13. Intel VRD11 Desktop Application Circuit Using the MAX8809A—3-Phase, 85A 40 ______________________________________________________________________________________ ...

Page 41

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 8. Bill of Materials for Intel VRD11 3-Phase Desktop Application Circuit (Figure 13) COMPONENTS C1–C4 1500µF, 16V aluminum electrolytic capacitors C5, C6, C7 10µF, 16V X5R ceramic ...

Page 42

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Figure 14. Intel VRD11 Desktop Application Circuit Using the MAX8810A—4-Phase, 115A 42 ______________________________________________________________________________________ ...

Page 43

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 9. Bill of Materials for Intel VRD11 4-Phase Desktop Application Circuit (Figure 14) COMPONENTS C1–C4 C5–C8 C9, C17, C18, C25 C10, C12, C13, C22, C29 C11, C15, ...

Page 44

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Figure 15. AMD K8 Rev F Desktop Application Circuit Using the MAX8810A—4-Phase, 115A 44 ______________________________________________________________________________________ ...

Page 45

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 10. Bill of Materials for AMD K8 Rev F Desktop Application Circuit (Figure 15) COMPONENTS C1–C4 C5–C8 C9, C17, C18, C25 C10, C12, C13, C22, C29 C11, ...

Page 46

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers Table 11. Suggested Component Suppliers COMPONENT SUPPLIER BI Technologies Falco International Rectifier Kemet Murata Pulse Panasonic Sanyo Taiyo Yuden TDK TOP VIEW ...

Page 47

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information 47 ...

Page 48

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 48 ______________________________________________________________________________________ Package Information (continued) ...

Page 49

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information (continued) 49 ...

Page 50

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 50 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Cardenas - 80% ...

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