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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8772 Datasheet

(MAX8770 - MAX8772) PWM Controller

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CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL® IMVP-6 LICENSEES
19-3913; Rev 0; 10/05
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWM Controller for IMVP-6+ CPU Core Power Supplies
General Description
The MAX8770/MAX8771/MAX8772 are 2/1-phase inter-
leaved Quick-PWM™ step-down VID power-supply con-
trollers for notebook CPUs. True out-of-phase operation
reduces input ripple current requirements and output volt-
age ripple while easing component selection and layout
difficulties. The Quick-PWM control provides instanta-
neous response to fast load current steps. Active voltage
positioning reduces power dissipation and bulk output
capacitance requirements and allows ideal positioning
www.DcaotamSphenest4aUti.ocnomfor tantalum, polymer, or ceramic bulk out-
put capacitors.
The MAX8770/MAX8771/MAX8772 are intended for two
different notebook CPU core applications: either bucking
down the battery directly to create the core voltage, or
else bucking down the +5V system supply. The single-
stage conversion method allows this device to directly
step down high-voltage batteries for the highest possible
efficiency. Alternatively, 2-stage conversion (stepping
down the +5V system supply instead of the battery) at
higher switching frequency provides the minimum possi-
ble physical size.
A slew-rate controller allows controlled transitions
between VID codes, controlled soft-start and shutdown,
and controlled exit from suspend. A thermistor-based
temperature sensor provides a programmable thermal-
fault output (VRHOT). A power-monitor output (POUT)
provides an analog voltage output proportional to the
power consumed by the CPU. The MAX8770/MAX8771/
MAX8772 include output undervoltage protection (UVP)
and thermal protection, and the MAX8770/MAX8771 also
include overvoltage protection (OVP). When any of these
protection features detect a fault, the controller shuts
down. A voltage-regulator power-OK (PWRGD) output
indicates the output is in regulation. A clock enable
(CLKEN) output provides proper system startup sequenc-
ing. Additionally, the MAX8771 has a phase-good
(PHASEGD) output, and the MAX8770/MAX8772 includes
true differential current sense.
The MAX8770/MAX8771/MAX8772 implement the Intel
IMVP-6+ code set and the required IMVP-6+ control sig-
nals. The MAX8770/MAX8771/MAX8772 are available in a
40-pin TQFN package.
Applications
IMVP-6+ Core Supply
Multiphase CPU Core Supply
Voltage-Positioned, Step-Down Converters
Notebook/Desktop Computers
Blade Servers
Intel is a registered trademark of Intel, Corp.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Features
Single/Dual-Phase, Quick-PWM Controller
±0.4% VOUT Accuracy Over Line, Load, and
Temperature
7-Bit On-Board DAC: 0 to +1.5000V Output Adjust
Range
Dynamic Phase Selection Optimizes Active/Sleep
Efficiency
Transient Phase Overlap Reduces Output
Capacitance
Integrated Boost Switches
Active Voltage Positioning with Adjustable Gain
Programmable 200kHz to 600kHz Switching
Frequency
Accurate Current Balance and Current Limit
Adjustable Slew-Rate Control
Power-Good (PWRGD), Clock Enable (CLKEN),
Power Monitor (POUT) and Thermal Fault
(VRHOT) Outputs
Phase Fault (PHASEGD) Output (MAX8771)
Drives Large Synchronous Rectifier MOSFETs
4V to 26V Battery-Input-Voltage Range
Output OV Protection (MAX8770/MAX8771)
UV and Thermal-Fault Protection
Power Sequencing and Timing
Soft-Startup and Soft-Shutdown
Ordering Information
PART
TEMP
PIN-PACKAGE
MAX8770GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
MAX8771GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
MAX8772GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
+Denotes lead-free package.
Pin Configuration appears 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8772 Datasheet

(MAX8770 - MAX8772) PWM Controller

No Preview Available !

CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL® IMVP-6 LICENSEES
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWM Controller for IMVP-6+ CPU Core Power Supplies
ABSOLUTE MAXIMUM RATINGS
VCC, VDD to GND .....................................................-0.3V to +6V
D0–D6, CSP_ to GND...............................................-0.3V to +6V
CSN12 (MAX8771) to GND ......................................-0.3V to +6V
CSN_ (MAX8770/MAX8772) to GND........................-0.3V to +6V
PHASEGD (MAX8771) to GND.................................-0.3V to +6V
THRM, VRHOT, CLKEN to GND...............................-0.3V to +6V
TIME, PWRGD, POUT to GND ......................-0.3V to VCC + 0.3V
REF, FB, CCV, CCI to GND ..........................-0.3V to VCC + 0.3V
SHDN to GND (Note 1)...........................................-0.3V to +14V
TON to GND ...........................................................-0.3V to +30V
www.DDaPtaRSShLePeVtR4U, .DcPoRmSTP, PSI to GND ...........................-0.3V to +6V
GNDS, PGND_ to GND .........................................-0.3V to +0.3V
DL_ to PGND_...............................................-0.3V to VDD + 0.3V
BST_ to GND ..........................................................-0.3V to +36V
LX_ to BST_ ..............................................................-6V to +0.3V
BST_ to VDD...........................................................-0.3V to +30V
DH_ to LX_ ..................................................-0.3V to VBST_ +0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation
40-Pin 6mm x 6mm Thin QFN
(derate 23.2mW/°C above +70°C) .............................2051mW
Operating Temperature Range .........................-40°C to +105°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: SHDN may be forced to 12V for the purpose of debugging prototype boards using the no-fault test mode, which disables
fault protection and disables overlapping operation.
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
(Circuit of Figure 1. VDD = VCC = VSHDN = VPSI = VDPRSTP = 5V, DPRSLPVR = GNDS = PGND_ = GND, VFB = VCCI = VCSP_ = VCSN_
= 1.200V, D0–D6 set for 1.20V (D0–D6 = 0001100). TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.)
PARAMETER
PWM CONTROLLER
Input Voltage Range
DC Output-Voltage Accuracy
Boot Voltage
GNDS Input Range
GNDS Gain
GNDS Input Bias Current
FB Input Bias Current
On-Time Accuracy (Note 3)
TON Shutdown Input Current
Minimum FB and CCI Voltages
for Pseudo-Fixed-Frequency
Operation
Minimum Off-Time
SYMBOL
VOUT
VBOOT
VGNDS
AGNDS
IGNDS
IFB
tON
tOFF(MIN)
CONDITIONS
VCC, VDD
Includes load-
regulation error
(Note 2)
DAC codes from
0.8375V to 1.500V
DAC codes from
0.500V to 0.825V
DAC codes below
0.4875V
VOUT/VGNDS, -200mV VGNDS +200mV
CSP_ = CSN_ for both enabled phases
VIN = 12V
VFB = VCCI = 1.2V
RTON = 96.75k
RTON = 200k
RTON = 303.25k
SHDN = 0, VIN = 26V, VCC = VDD = 0 or 5V
Switching frequency is reduced if FB and/or
CCI are less than this value
(Note 3)
MIN TYP MAX UNITS
4.5 5.5 V
-0.4
+0.4
%
-4
-10
1.19
-200
0.95
-25
-2
142
300
425
+4
1.20
1.00
-15
167
333
500
0.01
+10
1.21
+200
1.05
+2
+2
192
366
575
0.1
mV
V
mV
V/V
µA
µA
ns
µA
0.2 0.25
V
300 375
ns
2 _______________________________________________________________________________________


Part Number MAX8772
Description (MAX8770 - MAX8772) PWM Controller
Maker Maxim Integrated Products
PDF Download

MAX8772 Datasheet PDF






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