19-4781; Rev 1; 7/00
KIT
ATION
EVALU
ABLE
AVAIL
High-Speed, Digitally Adjusted
Step-Down Controllers for Notebook CPUs
The MAX1710/MAX1711 step-down controllers are
intended for core CPU DC-DC converters in notebook
computers. They feature a triple-threat combination of
ultra-fast transient response, high DC accuracy, and
high efficiency needed for leading-edge CPU core
power supplies. Maxim’s proprietary Quick-PWM™
quick-response, constant-on-time PWM control scheme
handles wide input/output voltage ratios with ease and
provides 100ns “instant-on” response to load transients
while maintaining a relatively constant switching frequency.
High DC precision is ensured by a 2-wire remote-sensing scheme that compensates for voltage drops in both
the ground bus and supply rail. An on-board, digital-toanalog converter (DAC) sets the output voltage in compliance with Mobile Pentium II® CPU specifications.
The MAX1710 achieves high efficiency at a reduced
cost by eliminating the current-sense resistor found in
traditional current-mode PWMs. Efficiency is further
enhanced by an ability to drive very large synchronousrectifier MOSFETs.
Single-stage buck conversion allows these devices 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 a higher switching frequency allows the minimum possible physical size.
The MAX1710/MAX1711 are identical except that the
MAX1711 have 5-bit DACs and the MAX1710 has a 4bit DAC. Also, the MAX1711 has a fixed overvoltage
protection threshold at VOUT = 2.25V and undervoltage
protection at VOUT = 0.8V whereas the MAX1710 has
variable thresholds that track VOUT. The MAX1711 is
intended for applications where the DAC code may
change dynamically.
Features
o Ultra-High Efficiency
o No Current-Sense Resistor (Lossless ILIMIT)
o Quick-PWM with 100ns Load-Step Response
o ±1% VOUT Accuracy over Line and Load
o 4-Bit On-Board DAC (MAX1710)
o 5-Bit On-Board DAC (MAX1711/MAX1712)
o 0.925V to 2V Output Adjust Range
(MAX1711/MAX1712)
o 2V to 28V Battery Input Range
o 200/300/400/550kHz Switching Frequency
o Remote GND and VOUT Sensing
o Over/Undervoltage Protection
o 1.7ms Digital Soft-Start
o Drive Large Synchronous-Rectifier FETs
o 2V ±1% Reference Output
o Power-Good Indicator
o Small 24-Pin QSOP Package
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX1710EEG
-40°C to +85°C
24 QSOP
MAX1711EEG
-40°C to +85°C
24 QSOP
Minimal Operating Circuit
BATTERY
4.5V TO 28V
+5V INPUT
VCC
Applications
OVP*
SHDN
Notebook Computers
FBS
ILIM
Docking Stations
GNDS
CPU Core DC-DC Converters
VDD
V+
BST
DH
MAX1710
MAX1711
REF MAX1712 LX
Single-Stage (BATT to VCORE) Converters
Two-Stage (+5V to VCORE) Converters
CC
OUTPUT
0.925V TO 2V
(MAX1711/MAX1712)
DL
D0
Quick-PWM is a trademark of Maxim Integrated Products.
D/A
INPUTS
PGND
*MAX1710 ONLY
**MAX1711/MAX1712 ONLY
D2
FB
D3
Mobile Pentium II is a registered trademark of Intel Corp.
Pin Configurations appear at end of data sheet.
D1
SKIP
D4** GND
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX1710/MAX1711/MAX1712
General Description
