Controllers. MAX8809A Datasheet


MAX8809A Datasheet PDF


Part Number

MAX8809A

Description

K8 Rev F 2/3/4-Phase PWM Controllers

Manufacture

Maxim Integrated

Total Page 30 Pages
Datasheet
Download MAX8809A Datasheet



MAX8809A
19-3886; Rev 1; 8/06
EVAALVUAAILTAIOBNLEKIT
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® VRD11/VRD10
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 (RA2) 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.
Features
VRD11/VRD10 and K8 Rev F Compliant
±0.35% Initial Output Voltage Accuracy
Dual Integrated Drivers with Integrated Bootstrap
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
Applications
Desktop PCs
Servers, Workstations
Desknote and LCD PCs
Voltage-Regulator Modules
Ordering Information
PART
MAX8809AETL+
PIN-
PACKAGE
40 Thin QFN
5mm x 5mm
PKG
CODE
T4055-1
FUNCTION
2-/3-phase
MAX8810AETM+
48 Thin QFN
6mm x 6mm
T4866-1
2-/3-/4-phase
+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.
________________________________________________________________ Maxim Integrated Products 1
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.

MAX8809A
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.......................-0.3V to (VCC + 0.3V)
CS_+, CS_-, VID_, BUF, EN, ILIM, SEL, VRREADY,
VRHOT, VCC to GND ............................................-0.3V to +6V
BST_ to PGND_ ......................................................-0.3V to +35V
LX_ to PGND_............................................................-1V to +28V
BST_ to VL_ ...............................................................-1V to +30V
DH_ to PGND_ .........................................-0.3V to (VBST_ + 0.3V)
DH_, BST_ to LX_ .....................................................-0.3V to +7V
VL_ to PGND_ ..........................................................-0.3V to +7V
DL_ to PGND_ ..........................................-0.3V to (VVL_ + 0.3V)
PGND_ to GND......................................................-0.3V to +0.3V
CS_+ to CS_-.........................................................-0.3V to +0.3V
DH_, DL_ Current ....................................................±200mARMS
VL_ to BST_ Diode Current...........................................50mARMS
Continuous Power Dissipation (TA = +70°C)
40-Pin Thin QFN 5mm x 5mm
(derate 35.7mW/°C above +70°C) ..........................2857.1mW
48-Pin Thin QFN 6mm x 6mm
(derate 37mW/°C above +70°C) ................................2963mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VVL_ = VBST_ = 6.5V, VCC = VEN = 5V, VILIM = 1.5V, VID_ = SEL = REF = BUF = unconnected, VCOMP = VRS+ = 1.0V, RVRREADY =
5kΩ pullup to 5V, RSS/OVP = 12kΩ to GND, RNTC = 10kΩ to GND, fSW = 300kHz, RVRTSET = 118kΩ to GND, VCS_+ = VCS_- = 1V,
PWM_ = unconnected, RVRHOT = 249Ω pullup to 1.05V, VGND = VPGND_ = VLX_ = VRS- = 0V, DL_ = DH_ = unconnected, TA = 0°C
to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER
VCC Operating Range
VCC UVLO Trip Level
VCC Shutdown Supply Current
VCC Standby Supply Current
VCC Operating Supply Current
Thermal Shutdown
INTERNAL REFERENCE (REF)
Output Voltage
Output Regulation (Sourcing)
Output Regulation (Sinking)
Reference UVLO Trip Level
BUF REFERENCE
BUF Regulation Voltage
BUF Output Regulation
SOFT-START
EN Startup Delay (TD1)
Soft-Start Period Range (TD2)
Soft-Start Tolerance
Intel Boot-Level Duration (TD3)
CONDITIONS
Rising
Falling
VCC < 3.75V
VEN = 0V
VRS+ - VRS- = 1.0V, no switching, VDAC = 1.0V (Note 1)
Temperature rising, hysteresis = 25°C (typ)
IREF = -100µA
VCC = 4.5V at IREF = -500µA to VCC = 5.5V at
IREF = -100µA
VCC = 4.5V at IREF = +100µA to VCC = 5.5V at
IREF = +500µA
Rising (100mV typ hysteresis)
IBUF = 0A
VCC = 4.5V at IBUF = +100µA to VCC = 5.5V at
IBUF = +500µA
From EN rising to VOUT rising
12kΩ < RSS/OVP < 90.9kΩ
RSS/OVP = 56kΩ
SEL = GND or SEL = VCC
MIN TYP MAX UNITS
4.5 5.5 V
4.0 4.25 4.5
3.7 4.0 4.3
V
0.35 mA
0.5 mA
13 mA
+160
°C
1.992 2.000 2.008
-0.05
+0.05
V
%
-0.2 +0.2
1.84
%
V
0.99
-0.25
1.0 1.01
+0.25
V
%
1.6
0.5
2.25
175
2.2
3.00
250
2.8
6.5
3.75
350
ms
ms
ms
µs
2 _______________________________________________________________________________________




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