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MAX8743EEI . ,Dual, High-Efficiency, Step-Down Controller with High Impedance in ShutdownELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V = V = 5V, SKIP = AGND, V+ = 15V, T = 0°C to +85°C ..
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MAX8743-MAX8743EEI-MAX8743EEI .-MAX8743ETX
Dual, High-Efficiency, Step-Down Controller with High Impedance in Shutdown
General DescriptionThe MAX8743 is a dual pulse-width modulation (PWM)
controller configured for step-down (buck) topologies
that provides the high efficiency, excellent transient
response, and high DC output accuracy necessary for
stepping down high-voltage batteries to generate low-
voltage chipset and RAM power supplies in notebook
computers. The CS_ inputs can be used with low-side
sense resistors to provide accurate current limits or can
be connected to LX_, using low-side MOSFETs as cur-
rent-sense elements. High output impedance in shut-
down eliminates negative output voltages, saving the
cost of a Schottky diode at the output.
The on-demand PWM controllers are free running, con-
stant on-time with input feed-forward. This configuration
provides ultra-fast transient response, wide input-output
differential range, low supply current, and tight load-reg-
ulation characteristics. The MAX8743 is simple and easy
to compensate.
Single-stage buck conversion allows the MAX8743 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 minimum
possible physical size.
The MAX8743 is intended for generating chipset, DRAM,
CPU I/O, or other low-voltage supplies down to 1V. The
MAX8743 is available in 28-pin QSOP and 36-pin thin
QFN packages.
ApplicationsNotebook Computers
CPU Core Supplies
Chipset/RAM Supplies as Low as 1V
1.8V and 2.5V I/O Supplies
FeaturesUltra-High EfficiencyAccurate Current-Limit OptionQuick-PWM™with 100ns Load-Step Response1% VOUTAccuracy over Line and LoadHigh Output Impedance in ShutdownDual Mode™Fixed 1.8V/1.5V/Adj or 2.5V/Adj OutputsAdjustable 1V to 5.5V Output Range2V to 28V Battery Input Range200kHz/300kHz/420kHz/540kHz Nominal Switching
FrequencyAdjustable Overvoltage Protection1.7ms Digital Soft-StartDrives Large Synchronous-Rectifier FETsPower-Good Window Comparator2V ±1% Reference Output
MAX8743
Dual, High-Efficiency, Step-Down
Controller with High Impedance in Shutdown19-3318; Rev 0; 6/04
Pin Configurations appear at end of data sheet.Quick-PWM and Dual Mode are trademarks of Maxim Integrated
Products, Inc.
Minimal Operating Circuit
Ordering Information
MAX8743
Dual, High-Efficiency, Step-Down
Controller with High Impedance in Shutdown
ABSOLUTE MAXIMUM RATINGS (Note 1)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.
V+ to AGND..............................................................-0.3 to +30V
VCCto AGND............................................................-0.3V to +6V
VDDto PGND............................................................-0.3V to +6V
AGND to PGND.....................................................-0.3V to +0.3V
PGOOD, OUT_ to AGND..........................................-0.3V to +6V
OVP, UVP, ILIM_, FB_, REF,
SKIP, TON, ON_ to AGND......................-0.3V to (VCC+ 0.3V)
DL_ to PGND..............................................-0.3V to (VDD+ 0.3V)
BST_ to AGND........................................................-0.3V to +36V
CS_ to AGND.............................................................-6V to +30V
DH1 to LX1..............................................-0.3V to (VBST1 + 0.3V)
LX_ to BST_..............................................................-6V to +0.3V
DH2 to LX2..............................................-0.3V to (VBST2 + 0.3V)
REF Short Circuit to GND...........................................Continuous
Continuous Power Dissipation (TA= +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW
36-Pin 6mm ✕6mm Thin QFN
(derate 26.3mW/°C above +70°C).............................2105mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VDD= VCC = 5V, SKIP= AGND, V+ = 15V, TA
= 0°C to +85°C, typical values are at +25°C, unless otherwise
Note 1:For the MAX8743EEI, AGND and PGND refer to a single pin designated GND.
MAX8743
Dual, High-Efficiency, Step-Down
Controller with High Impedance in Shutdown
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDD= VCC = 5V, SKIP= AGND, V+ = 15V, TA
= 0°C to +85°C, typical values are at +25°C, unless otherwise
MAX8743
Dual, High-Efficiency, Step-Down
Controller with High Impedance in Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VDD= VCC = 5V, SKIP= AGND, V+ = 15V, TA
= 0°C to +85°C, typical values are at +25°C, unless otherwise
MAX8743
Dual, High-Efficiency, Step-Down
Controller with High Impedance in Shutdown
ELECTRICAL CHARACTERISTICS
