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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1712 Datasheet

High-Speed / Digitally Adjusted Step-Down Controllers for Notebook CPUs

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MAX1712 pdf
19-4781; Rev 1; 7/00
EVAALVUAAILTAIOBNLEKIT
High-Speed, Digitally Adjusted
Step-Down Controllers for Notebook CPUs
General Description
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
the ground bus and supply rail. An on-board, digital-to-
analog converter (DAC) sets the output voltage in com-
pliance 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 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/MAX1711 are identical except that the
MAX1711 have 5-bit DACs and the MAX1710 has a 4-
bit 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.
Applications
Notebook Computers
Docking Stations
CPU Core DC-DC Converters
Single-Stage (BATT to VCORE) Converters
Two-Stage (+5V to VCORE) Converters
Quick-PWM is a trademark of Maxim Integrated Products.
Mobile Pentium II is a registered trademark of Intel Corp.
Pin Configurations appear at end of data sheet.
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
MAX1710EEG
MAX1711EEG
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 QSOP
24 QSOP
Minimal Operating Circuit
+5V INPUT
BATTERY
4.5V TO 28V
VCC OVP*
SHDN
FBS
ILIM
GNDS
VDD
V+
BST
DH
MAX1710
MAX1711
REF MAX1712 LX
CC
D0
D/A
INPUTS
D1
D2
D3
*MAX1710 ONLY
D4** GND
**MAX1711/MAX1712 ONLY
DL
PGND
FB
SKIP
OUTPUT
0.925V TO 2V
(MAX1711/MAX1712)
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1712 Datasheet

High-Speed / Digitally Adjusted Step-Down Controllers for Notebook CPUs

No Preview Available !

MAX1712 pdf
High-Speed, Digitally Adjusted
Step-Down Controllers for Notebook CPUs
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +30V
VCC, VDD to GND .....................................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
SHDN, PGOOD to GND ...........................................-0.3V to +6V
OVP, ILIM, FB, FBS, CC, REF, D0–D4,
GNDS, TON to GND ..............................-0.3V to (VCC + 0.3V)
SKIP to GND (Note 1).................................-0.3V to (VCC + 0.3V)
DL to PGND................................................-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 (TA = +70°C)
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 Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: SKIP may be forced below -0.3V, temporarily exceeding the absolute maximum rating, for the purpose of debugging proto-
type breadboards using the no-fault test mode. Limit the current drawn to -5mA maximum.
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, VBATT = 15V, VCC = VDD = 5V, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNIT
Input Voltage Range
Battery voltage, V+
VCC, VDD
2 28
V
4.5 5.5
DC Output Voltage Accuracy
DAC codes from 1.3V to 2V
VBATT = 4.5V to 28V, includes
load regulation error
DAC codes from 0.925V
to 1.275V
-1
-1.2
1
%
1.2
Load Regulation Error
Remote-Sense Voltage Error
Line Regulation Error
FB Input Bias Current
ILOAD = 0 to 7A
FB - FBS or GNDS - GND = 0 to 25mV
VCC = 4.5V to 5.5V, VBATT = 4.5V to 28V
FB (MAX1710 only) or FBS
9 mV
3 mV
5 mV
-0.2 0.2 µA
FB Input Resistance
(MAX1711/MAX1712)
130 180 240 k
GNDS Input Bias Current
Soft-Start Ramp Time
On-Time
Rising edge of SHDN to full ILIM
TON = GND (550kHz)
VBATT = 24V, TON = REF (400kHz)
FB = 2V
(Note 2)
TON = open (300kHz)
TON = VCC (200kHz)
Minimum Off-Time
(Note 2)
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 Measured at V+
Shutdown Supply Current (VCC) SHDN = 0
Shutdown Supply Current (VDD) SHDN = 0
-1 1 µA
1.7 ms
140 160 180
175 200 225
260 290 320
ns
380 425 470
400 500
ns
600 950 µA
<1 5 µA
25 40 µA
<1 5 µA
<1 5 µA
Shutdown Battery Supply
Current
SHDN = 0, measured at V+ = 28V, VCC = VDD = 0 or 5V
<1 5 µA
Reference Voltage
Reference Load Regulation
REF Sink Current
REF Fault Lockout Voltage
VCC = 4.5V to 5.5V, no external REF load
IREF = 0 to 50µA
REF in regulation
Falling edge, hysteresis = 40mV
1.98 2 2.02 V
0.01 V
10 µA
1.6 V
2 _______________________________________________________________________________________


Part Number MAX1712
Description High-Speed / Digitally Adjusted Step-Down Controllers for Notebook CPUs
Maker Maxim
Total Page 28 Pages
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