Rainbow Electronics MAX17409 - Manual

General Description
The MAX17409 is a 1-phase Quick-PWM™ step-down
VID power-supply controller for high-performance graph-
ics processors. The Quick-PWM control provides instan-
taneous response to fast-load current steps. Active
voltage positioning reduces power dissipation and bulk
output capacitance requirements and allows ideal posi-
tioning compensation for tantalum, polymer, or ceramic
bulk output capacitors.
The MAX17409 is intended for two different notebook
processor core applications: either bucking down the bat-
tery directly to create the core voltage, or bucking down
the +5V system supply. The single-stage conversion
method allows this device to directly step down high-volt-
age 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 possible physical size.
A slew-rate controller allows controlled transitions
between VID codes. A thermistor-based temperature
sensor provides programmable thermal protection.
The MAX17409 is available in a 28-pin, 4mm x 4mm
TQFN package.
Applications
Graphics Core (GPU) Power Supplies
Voltage-Positioned Step-Down Converters
2-to-4 Li+ Cells Battery to Processor Core
Supply Converters
Notebooks/Desktops/Servers
Features
♦ 1-Phase Quick-PWM Controller
♦ ±6mV V
OUT Accuracy Over Line, Load, and
Temperature
♦ 6-Bit Graphics DAC (12.5mV LSB)
♦ Active Voltage Positioning with Adjustable Gain
♦ Accurate Droop and Current Limit
♦ Remote Output and Ground Sense
♦ Buffered 2V Reference Output for Offsets
♦ Power-Good Window Comparator
♦ Temperature Comparator
♦ Drives Large Synchronous Rectifier FETs
♦ 2V to 26V Power Input Range
♦ Adjustable Switching Frequency (600kHz max)
♦ Output Overvoltage and Undervoltage Protection
♦ Soft-Startup and Soft-Shutdown
♦ Internal Boost Diodes
MAX17409
1-Phase Quick-PWM GPU Controller
________________________________________________________________ Maxim Integrated Products 1
26
27
25
24
10
9
11
GNDS/OFSP
CSN CSP SKIP
THRM
12
IMON
BST DL PGND LX G5 G4
1 2
REF
4 5 6 7
20 21 19 17 16 15
ILIM
V CC
G1
G0
SHDN
PWRGD
MAX17409
PAD
GND
FB
V
DD
3
18
28 8 CCV TON
VRHOT
23 13 G2 GND
22 14 G3 DH
THIN QFN
TOP VIEW
Pin Configuration
Ordering Information
19-4590; Rev 1; 7/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
MAX17409GTI+ -40°C to +105°C 28 TQFN-EP*
Quick-PWM is a trademark of Maxim Integrated Products, Inc.