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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1718 Datasheet

Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II

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MAX1718 pdf
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 controlprovides “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.
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.
Features
o Quick-PWM Architecture
o ±1% VOUT Accuracy Over Line and Load
o 5-Bit On-Board DAC with Input Muxes
o Precision-Adjustable VOUT Slew Control
o 0.6V to 1.75V Output Adjust Range
o Precision Offset Control
o Supports Voltage-Positioned Applications
o 2V to 28V Battery Input Range
o Requires a Separate 5V Bias Supply
o 200/300/550/1000kHz Switching Frequency
o Over/Undervoltage Protection
o Drives Large Synchronous-Rectifier FETs
o 700µA (typ) ICC Supply Current
o 2µA (typ) Shutdown Supply Current
o 2V ±1% Reference Output
o VGATE Blanking During Transition
o Small 28-Pin QSOP Package
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
SHUTDOWN
DUAL MODE VID
MUX INPUTS
MUX CONTROL
SUSPEND
INPUT
DECODER
5V INPUT
VCC
SKP/SDN
ILIM
VDD
V+
BST
MAX1718 DH
D0
D1 LX
D2
D3 DL
D4
ZMODE
SUS
GND
S0
S1 FB
TIME NEG
CC POS
BATT 2V TO 28V
OUTPUT
0.6V TO 1.75V
VCC
Patent pending.
Quick-PWM is a trademark of Maxim Integrated Products.
IMVP-II is a trademark of Intel Corp.
REF
VGATE
TON OVP
POWER-GOOD
OUTPUT
________________________________________________________________ Maxim Integrated Products 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1718 Datasheet

Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II

No Preview Available !

MAX1718 pdf
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +30V
VCC, VDD to GND .....................................................-0.3V to +6V
D0D4, ZMODE, VGATE, OVP, SUS, to GND .........-0.3V to +6V
SKP/SDN to GND ...................................................-0.3V to +16V
ILIM, CC, REF, POS, NEG, S1, S0,
TON, TIME to GND .................................-0.3V to (VCC + 0.3V)
DL to GND ..................................................-0.3V to (VDD + 0.3V)
BST to GND ............................................................-0.3V to +36V
DH to LX .....................................................-0.3V to (BST + 0.3V)
LX to BST..................................................................-6V to +0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, VCC = VDD = SKP/SDN = 5V, VOUT = 1.25V, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX
PWM CONTROLLER
Input Voltage Range
Battery voltage, V+
VCC, VDD
2 28
4.5 5.5
DC Output Voltage Accuracy
V+ = 4.5V to 28V,
includes load
regulation error
DAC codes from 0.9V to 1.75V
DAC codes from 0.6V to 0.875V
-1
-1.5
+1
+1.5
Line Regulation Error
Input Bias Current
VCC = 4.5V to 5.5V, VBATT = 4.5V to 28V
FB, POS, NEG
POS, NEG Common-Mode Range
POS, NEG Differential Range
POS, NEG Offset Gain
TIME Frequency Accuracy
POS - NEG
VFB / (POS - NEG); POS - NEG = 50mV
150kHz nominal, RTIME = 120k
380kHz nominal, RTIME = 47k
38kHz nominal, RTIME = 470k
V+ = 5V, FB = 1.2V, TON = GND (1000kHz)
On-Time (Note 1)
V+ = 12V, FB = 1.2V
TON = REF (550kHz)
TON = open (300kHz)
Minimum Off-Time (Note 1)
TON = VCC (200kHz)
TON = VCC, open, or REF (200kHz, 300kHz, or 550kHz)
TON = GND (1000kHz)
BIAS AND REFERENCE
Quiescent Supply Current (VCC) Measured at VCC, FB forced above the regulation point
Quiescent Supply Current (VDD) Measured at VDD, FB forced above the regulation point
Quiescent Battery Supply
Current (V+)
Shutdown Supply Current (VCC)
Shutdown Supply Current (VDD)
SKP/SDN = GND
SKP/SDN = GND
Shutdown Battery Supply
Current (V+)
SKP/SDN = GND, VCC = VDD = 0V or 5V
Reference Voltage
VCC = 4.5V to 5.5V, no REF load
5
-0.2 +0.2
0.4 2.5
-80 +80
0.81 0.86 0.91
-8 +8
-12 +12
-12 +12
230 260 290
165 190 215
320 355 390
465 515 565
400 500
300 375
700 1200
<1 5
25 40
25
<1 5
<1 5
1.98 2 2.02
UNITS
V
%
%
mV
µA
V
mV
V/V
%
ns
ns
µA
µA
µA
µA
µA
µA
V
2 _______________________________________________________________________________________


Part Number MAX1718
Description Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II
Maker Maxim
Total Page 30 Pages
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