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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1717 Datasheet

Dynamically Adjustable / Synchronous Step-Down Controller for Notebook CPUs

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19-1636; Rev 0; 1/00
EVAALVUAAILTAIOBNLEKIT Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
General Description
The MAX1717 step-down controller is intended for core
CPU DC-DC converters in notebook computers. It fea-
tures a dynamically adjustable output, ultra-fast tran-
sient 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.
The output voltage can be dynamically adjusted
through the 5-bit digital-to-analog converter (DAC)
inputs over a 0.925V to 2V range. A unique feature of
the MAX1717 is an internal multiplexer (mux) that
accepts two 5-bit DAC settings with only five digital
input pins. Output voltage transitions are accomplished
with a proprietary precision slew-rate controlthat mini-
mizes surge currents to and from the battery while
guaranteeing “just-in-time” arrival at the new DAC setting.
High DC precision is enhanced by a two-wire remote-
sensing scheme that compensates for voltage drops in
the ground bus and output voltage rail. Alternatively,
the remote-sensing inputs can be used together with
the MAX1717’s high DC accuracy to implement a volt-
age-positioned circuit that modifies the load-transient
response to reduce output capacitor requirements and
full-load 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
battery) at a higher switching frequency allows the mini-
mum possible physical size.
The MAX1717 is available in a 24-pin QSOP package.
Applications
Notebook Computers with SpeedStep™ or Other
Dynamically Adjustable Processors
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.
Patent pending.
Quick-PWM is a trademark of Maxim Integrated Products.
SpeedStep is a trademark of Intel Corp.
Features
o Quick-PWM Architecture
o ±1% VOUT Accuracy Over Line and Load
o 5-Bit On-Board DAC with Input Mux
o Precision-Adjustable VOUT Slew Control
o 0.925V to 2V Output Adjust Range
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 Transition-Complete Indicator
o Small 24-Pin QSOP Package
PART
MAX1717EEG
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
24 QSOP
Minimal Operating Circuit
+5V INPUT
MAX1717
BATTERY
2.5V TO 28V
DAC
INPUTS
VCC
SKP/SDN
FBS
ILIM
GNDS
A/B
VDD
V+
BST
DH
REF
TON LX
CC DL
D0
GND
D1
D2 FB
D3 TIME
D4 VGATE
OUTPUT
0.925V TO 2V
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1717 Datasheet

Dynamically Adjustable / Synchronous Step-Down Controller for Notebook CPUs

No Preview Available !

Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +30V
VCC, VDD to GND .....................................................-0.3V to +6V
D0–D4, A/B, VGATE, to GND ..................................-0.3V to +6V
SKP/SDN to GND ...................................................-0.3V to +16V
ILIM, FB, FBS, CC, REF, GNDS,
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
24-Pin QSOP (derate 9.5mW/°C above +70°C)...........762mW
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 = 1.6V, 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
(Note 1)
V+ = 4.5V to 28V,
includes load
regulation error
DAC codes from 1.3V to 2V
DAC codes from 0.925V to 1.275V
-1
-1.2
1
1.2
Remote Sense Voltage Error
Line Regulation Error
FB Input Resistance
FBS Input Bias Current
GNDS Input Bias Current
TIME Frequency Accuracy
On-Time (Note 2)
Minimum Off-Time (Note 2)
Minimum Off-Time (Note 2)
BIAS AND REFERENCE
Quiescent Supply Current (VCC)
Quiescent Supply Current (VDD)
Quiescent Battery Supply
Current (V+)
Shutdown Supply Current (VCC)
Shutdown Supply Current (VDD)
Shutdown Battery Supply
Current (V+)
FB to FBS or GNDS to GND = 0 to 25mV
VCC = 4.5V to 5.5V, VBATT = 4.5V to 28V
150kHz nominal, RTIME = 120k
380kHz nominal, RTIME = 47k
38kHz nominal, RTIME = 470k
V+ = 5V, FB = 2V, TON = GND (1000kHz)
TON = REF (550kHz)
V+ = 24V, FB = 2V
TON = open (300kHz)
TON = VCC (200kHz)
TON = VCC, open, or REF (200kHz, 300kHz, or 550kHz)
TON = GND (1000kHz)
Measured at VCC, FB forced above the regulation point
Measured at VDD, FB forced above the regulation point
SKP/SDN = 0
SKP/SDN = 0
SKP/SDN = 0, VCC = VDD = 0 or 5V
3
5
115 180 265
-0.2 0.2
-1 1
-8 +8
-12 +12
-12 +12
375 425 475
135 155 173
260 289 318
375 418 461
400 500
300 375
700 1200
<1 5
25 40
25
<1 5
<1 5
Reference Voltage
VCC = 4.5V to 5.5V, no REF load
1.98 2 2.02
UNITS
V
%
%
mV
mV
k
µA
µA
%
ns
ns
ns
µA
µA
µA
µA
µA
µA
V
2 _______________________________________________________________________________________


Part Number MAX1717
Description Dynamically Adjustable / Synchronous Step-Down Controller for Notebook CPUs
Maker Maxim
Total Page 30 Pages
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