MAX8809AETL+ Maxim Integrated Products, MAX8809AETL+ Datasheet

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

1.MAX8809AETL.pdf (50 pages)

Specifications of MAX8809AETL+

0644

Current page: 1 of 50
Download datasheet (684Kb)

Controllers with Integrated Dual MOSFET Drivers

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

active current averaging (RA

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.

19-3886; Rev 1; 8/06

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.

Intel is a registered trademark of Intel Corp.

VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM

________________________________________________________________ Maxim Integrated Products

General Description

) eliminates the tolerance

VRD11/VRD10

♦ VRD11/VRD10 and K8 Rev F Compliant

♦ ±0.35% Initial Output Voltage Accuracy

♦ Dual Integrated Drivers with Integrated Bootstrap

♦ Up to 26V Input Voltage

♦ Adaptive Shoot-Through Protection

♦ Soft-Start, Soft-Stop, VRREADY Output

♦ Fast Load Transient Response

♦ Individual Phase, Fully Temperature-

♦ Current Foldback at Short Circuit

♦ Voltage Positioning or Integral Feedback

♦ Differential Remote Voltage Sensing

♦ Programmable Positive and Negative Offset

♦ 150kHz to 1.2MHz Switching Frequency per Phase

♦ NTC-Based, Temperature-Independent Load Line

♦ Precise Phase Current Sharing

♦ Programmable Thermal-Monitoring Output

♦ 6A Peak MOSFET Drivers

♦ 0.3Ω/0.85Ω Low-Side, 0.8Ω/1.1Ω High-Side

♦ 40-Pin and 48-Pin Thin QFN Packages

+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.

MAX8809AETL+

MAX8810AETM+

Diodes

Compensated Cycle-by-Cycle Average Current

Limit

Voltages

(VRHOT)

Drivers (typ)

PART

Desktop PCs

Servers, Workstations

Desknote and LCD PCs

Voltage-Regulator Modules

PIN-

PACKAGE

40 Thin QFN

5mm x 5mm

48 Thin QFN

6mm x 6mm

Ordering Information

T4055-1

T4866-1

CODE

PKG

Applications

Features

2-/3-/4-phase

FUNCTION

2-/3-phase

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 ...

Page 11

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 - ...

Page 12

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 ...

Page 13

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 ...

Page 14

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- ...

Page 15

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 ...

Page 16

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 ...