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MAX8775

Description
Dual and Combinable Graphics Core Controller for Notebook Computers
File Size1MB,30 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Compare View All

MAX8775 Overview

Dual and Combinable Graphics Core Controller for Notebook Computers

19-0670; Rev 0; 11/06
KIT
ATION
EVALU
BLE
AVAILA
Dual and Combinable Graphics Core
Controller for Notebook Computers
General Description
Features
o
Dual-Output, Fixed-Frequency, Current-Mode
Control
o
Combinable Output for Higher Currents
o
Dynamic Output Voltages with Automatic Fault
Blanking and Transition Control
o
True Out-of-Phase Operation
o
True Differential Current Sense for Accurate
Current Limit and Current Balance
o
4V to 26V Input Range
o
100kHz to 600kHz Switching Frequency
o
0.5V to 2.5V Adjustable Outputs
o
Internal Integrator for High Output Accuracy
o
Stable with Low-ESR Output Capacitors
o
Independent Selectable PWM and Skip-Mode
Operation
o
Independent Power-Good Outputs
o
Soft-Start and Soft-Stop
o
2.5V Precision Reference
o
< 1µA Typical Shutdown Current
MAX8775
The MAX8775 is a dual, step-down, interleaved, fixed-
frequency, switch-mode power-supply (SMPS) con-
troller with synchronous rectification. It is intended for
GPU cores and I/O power generation in battery-pow-
ered systems. Flexible configuration allows the
MAX8775 to operate as two independent single-phase
regulators, or as one high-current two-phase regulator.
Configured in separate mode, the MAX8775 provides
power to two dynamic voltage rails, one for the GPU
core and the other for the I/O power rail. Configured in
combined mode, the MAX8775 functions as a two-
phase, high-current, single-output GPU core regulator,
powering the high-performance GPU engines used in
gaming machines and media center notebooks.
The REFIN voltage setting allows for multiple dynamic
output voltages required by the different GPU operating
and sleep states. Automatic fault blanking, forced-PWM
operation, and transition control are achieved by
detecting the voltage change at REFIN. Fixed-frequen-
cy operation with 180° out-of-phase interleaving mini-
mizes input ripple current from the lowest input
voltages up to the 26V maximum input. Current-mode
control allows the use of low-ESR output capacitors.
Internal integrators maintain high output accuracy over
the full line-and-load range, in both forced-PWM mode
and pulse-skipping mode. True differential current
sensing provides accurate output current limit and cur-
rent balance when operated in combined mode.
Independent on/off and skip control allows flexible
power sequencing and power management. Voltage-
controlled soft-start reduces inrush current. Soft-stop
gradually ramps the output voltage down, preventing
negative voltage dips.
Ordering Information
PART
MAX8775ETJ+
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
32 Thin QFN
5mm x 5mm
PKG
CODE
T3255-5
+Denotes
lead-free package.
Pin Configuration
BST1
DL1
BST2
17
16
15
14
13
DH2
ON2
CSL2
CSH2
SKIP2
PGOOD2
CCI2
SLEW2
12
11
10
9
1
OVP1
2
OSC
3
REFIN1
4
V
CC
5
AGND
6
REF
7
REFIN2
8
OVP2
V
DD
DL2
19
LX1
LX2
18
Applications
2 to 4 Li+ Cells Battery-Powered Devices
Media Center and Gaming Notebooks
GPU and I/O Power Supplies
Tracking Output Power Supplies
TOP VIEW
24
DH1 25
ON1 26
CSL1 27
CSH1 28
SKIP1 29
PGOOD1 30
DTRANS 31
SLEW1 32
23
22
21
20
MAX8775
THIN QFN
5mm x 5mm
________________________________________________________________
Maxim Integrated Products
PGND
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.

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Description Dual and Combinable Graphics Core Controller for Notebook Computers Dual and Combinable Graphics Core Controller for Notebook Computers
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