MAX1718EEI Datasheet Download

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MAX1718EEI
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Description:
[Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II]
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694 K
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35 Pages
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype
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19-1960; Rev 3; 8/02
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP -II)
General Description
The MAX1718 step-down controller is intended for core
CPU DC-DC converters in notebook computers. It fea-
tures a dynamically adjustable output, ultra-fast transient
response, high DC accuracy, and high efficiency need-
ed 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.
The output voltage can be dynamically adjusted through
the 5-bit digital-to-analog converter (DAC) over a 0.6V to
1.75V range. The MAX1718 has an internal multiplexer
that accepts three unique 5-bit VID DAC codes corre-
sponding to Performance, Battery, and Suspend modes.
Precision slew-rate control
provides “just-in-time” arrival
at the new DAC setting, minimizing surge currents to
and from the battery.
The internal DAC of the MAX1718B is synchronized to
the slew-rate clock for improved operation under
aggressive power management of newer chipsets and
operating systems that can make incomplete mode tran-
sitions.
A pair of complementary offset control inputs allows
easy compensation for IR drops in PC board traces or
creation of a voltage-positioned power supply. Voltage-
positioning modifies the load-transient response to
reduce output capacitor requirements and total system
power dissipation.
Single-stage buck conversion allows these devices to
directly step down high-voltage batteries for the highest
possible efficiency. Alternatively, two-stage conversion
(stepping down the 5V system supply instead of the bat-
tery) at a higher switching frequency allows the mini-
mum possible physical size.
The MAX1718 is available in a 28-pin QSOP package.
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Features
Quick-PWM Architecture
±1% V
OUT
Accuracy Over Line and Load
5-Bit On-Board DAC with Input Muxes
Precision-Adjustable V
OUT
Slew Control
0.6V to 1.75V Output Adjust Range
Precision Offset Control
Supports Voltage-Positioned Applications
2V to 28V Battery Input Range
Requires a Separate 5V Bias Supply
200/300/550/1000kHz Switching Frequency
Over/Undervoltage Protection
Drives Large Synchronous-Rectifier FETs
700µA (typ) I
CC
Supply Current
2µA (typ) Shutdown Supply Current
2V ±1% Reference Output
VGATE Blanking During Transition
Small 28-Pin QSOP Package
MAX1718
Ordering Information
PART
MAX1718EEI
MAX1718BEEI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
Minimal Operating Circuit
5V INPUT
BATT 2V TO 28V
V
CC
SKP/SDN
SHUTDOWN
ILIM
V
DD
V+
BST
MAX1718
DH
D0
D1
DUAL MODE VID
MUX INPUTS
D2
D3
D4
ZMODE
SUS
S0
S1
TIME
FB
NEG
POS
LX
DL
GND
OUTPUT
0.6V TO 1.75V
Applications
IMVP-II™ Notebook Computers
2-Cell to 4-Cell Li+ Battery to CPU Core Supply
Converters
5V to CPU Core Supply Converters
Pin Configuration appears at end of data sheet.
MUX CONTROL
SUSPEND
INPUT
DECODER
CC
REF
VCC
Patent pending.
Quick-PWM is a trademark of Maxim Integrated Products.
IMVP-II is a trademark of Intel Corp.
TON
VGATE
OVP
POWER-GOOD
OUTPUT
________________________________________________________________
Maxim Integrated Products
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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.