MAX1711 Maxim, MAX1711 Datasheet
MAX1711
Manufacturer Part Number
MAX1711
Description
High-Speed / Digitally Adjusted Step-Down Controllers for Notebook CPUs
Manufacturer
Maxim
Datasheet
1.MAX1711.pdf
(28 pages)
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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 fre-
quency.
High DC precision is ensured by a 2-wire remote-sens-
ing scheme that compensates for voltage drops in both
ground bus and the supply rail. An on-board, digital-to-
analog converter (DAC) sets the output voltage in com-
pliance with Mobile Pentium II
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 synchronous-
rectifier 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 mini-
mum possible physical size.
The MAX1710 and MAX1711 are identical except that
the MAX1711 has a 5-bit DAC rather than a 4-bit DAC.
Also, the MAX1711 has a fixed overvoltage protection
threshold at V
at V
thresholds that track V
for applications where the DAC code may change
dynamically.
19-4781; Rev 0; 11/98
QUICK-PWM is a trademark of Maxim Integrated Products.
Mobile Pentium II is a registered trademark of Intel Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
For small orders, phone 1-800-835-8769.
Pin Configuration appears at end of data sheet.
OUT
Notebook Computers
Docking Stations
CPU Core DC-DC Converters
Single-Stage (BATT to V
Two-Stage (+5V to V
= 0.8V, whereas the MAX1710 has variable
Step-Down Controllers for Notebook CPUs
OUT
________________________________________________________________ Maxim Integrated Products
= 2.25V and undervoltage protection
OUT
General Description
CORE
. The MAX1711 is intended
®
CORE)
CPU specifications.
) Converters
Applications
Converters
High-Speed, Digitally Adjusted
MAX1710EEG
MAX1711EEG
Ultra-High Efficiency
No Current-Sense Resistor (Lossless I
QUICK-PWM with 100ns Load-Step Response
±1% V
4-Bit On-Board DAC (MAX1710)
5-Bit On-Board DAC (MAX1711)
0.925V to 2V Output Adjust Range (MAX1711)
2V to 28V Battery Input Range
200/300/400/550kHz Switching Frequency
Remote GND and V
Over/Undervoltage Protection
1.7ms Digital Soft-Start
Drives Large Synchronous-Rectifier FETs
2V ±1% Reference Output
Power-Good Indicator
Small 24-Pin QSOP Package
**MAX1711 ONLY
*MAX1710 ONLY
PART
+5V INPUT
OUT
INPUTS
D/A
Accuracy over Line and Load
Minimal Operating Circuit
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
V
SHDN
FBS
ILIM
GNDS
REF
CC
D0
D1
D2
D3
D4**
CC
Ordering Information
MAX1710
MAX1711
OUT
GND
OVP*
Sensing
PGND
SKIP
V
BST
DH
LX
DL
DD
V+
FB
4.5V TO 28V
PIN-PACKAGE
BATTERY
Features
24 QSOP
24 QSOP
LIMIT
0.925V TO 2V
(MAX1711)
OUTPUT
)
1
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