MAX1775EEE ,Dual-Output Step-Down DC-DC Converter for PDA/Palmtop ComputersFeaturesThe MAX1775 is a dual, step-down DC-DC converter Dual, High-Efficiency, Synchronous Rectif ..
MAX1775EEE ,Dual-Output Step-Down DC-DC Converter for PDA/Palmtop ComputersApplicationsPART TEMP. RANGE PIN-PACKAGEMAX1775EEE -40°C to +85°C 16 QSOPHand-Held ComputersPDAsInt ..
MAX1775EEE+ ,Dual-Output Step-Down DC-DC Converter for PDA/Palmtop ComputersApplicationsPART TEMP RANGE PIN-PACKAGEHand-Held ComputersMAX1775EEE -40°C to +85°C 16 QSOPPDAsInte ..
MAX1775EEE+T ,Dual-Output Step-Down DC-DC Converter for PDA/Palmtop ComputersMAX177519-1811; Rev 2; 4/09Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
MAX1775EEE+T ,Dual-Output Step-Down DC-DC Converter for PDA/Palmtop ComputersELECTRICAL CHARACTERISTICS(V = +12V, V = V = V = V = +3.3V, V = +1.8V, Circuit of Figure 4, T = 0°C ..
MAX1775EEE-T ,Dual-Output Step-Down DC-DC Converter for PDA/Palmtop ComputersApplicationsPART TEMP RANGE PIN-PACKAGEHand-Held ComputersMAX1775EEE -40°C to +85°C 16 QSOPPDAsInte ..
MAX4612ESD ,Low-Voltage / Quad / SPST CMOS Analog SwitchesGeneral Description ________
MAX4612EUD+ ,Low-Voltage, Quad, SPST CMOS Analog SwitchesMAX4610/MAX4611/MAX461219-4793; Rev 2; 11/03Low-Voltage, Quad, SPST CMOS Analog Switches
MAX4613CSE ,Quad, SPST Analog SwitchELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = 15V, V- = -15V, V = 5V, GND = 0V, V = 2.4V, V = 0.8V, ..
MAX4613CUE ,Quad, SPST Analog SwitchMAX461319-1362; Rev 0; 4/98Quad, SPST Analog Switch________________
MAX4613CUE+T ,Quad, SPST Analog SwitchELECTRICAL CHARACTERISTICS—Dual Supplies (continued)(V+ = 15V, V- = -15V, V = 5V, GND = 0V, V = 2.4 ..
MAX4613EEE ,Quad, SPST Analog SwitchFeaturesThe MAX4613 quad analog switch
MAX1775EEE
Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
General DescriptionThe MAX1775 is a dual, step-down DC-DC converter
that generates both the main (+3.3V at over 2A) and
core (+1.8V at up to 1.5A) supplies for a complete
power solution for PDAs, subnotebooks, and other
hand-held devices. The main output is adjustable from
+1.25V to +5.5V. The core output is adjustable from 1V
to 5V. Both switching converters operate at up to
1.25MHz for small external components and use syn-
chronous rectifiers to achieve efficiencies up to 95%.
Operation with up to 100% duty cycle provides the low-
est possible dropout voltage to extend useful battery
life.
The MAX1775 accepts inputs from +2.7V up to +28V,
allowing use with many popular battery configurations as
well as AC-DC wall adapters. Digital soft-start reduces
battery current surges at power-up. Both the main and
core converters have separate shutdown inputs. The
MAX1775 comes in a small 16-pin QSOP package.
The MAX1775 evaluation kit is available to help reduce
design time.
________________________ApplicationsHand-Held Computers
PDAs
Internet Access Tablets
POS Terminals
Subnotebooks
FeaturesDual, High-Efficiency, Synchronous Rectified
Step-Down ConverterMain Power
Adjustable from +1.25V to +5.5V
Over 2A Load Current
Up to 95% EfficiencyCore Power
Adjustable from 1V to 5V
Internal Switches
Up to 1.5A Load Current
Up to 92% Efficiency100% (max) Duty CycleUp to 1.25MHz Switching FrequencyInput Voltage Range from +2.7V to +28V170µA Quiescent Current5µA Shutdown CurrentDigital Soft-StartIndependent Shutdown Inputs
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
Pin Configuration
Ordering Information
Typical Operating Circuit
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= +12V, VMAIN= VINC= VCS-= VCS+= +3.3V, VCORE= +1.8V, Circuit of Figure 4, TA
= 0°C to +85°C,unless otherwise noted.
Typical values are at TA= +25°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.
IN, SHDNM, CVH to GND.......................................-0.3V to +30V
IN to CVH, PDRV......................................................-0.3V to +6V
PDRV to GND..................................(VCVH- 0.3V) to (VIN+ 0.3V)
PGND to GND.......................................................-0.3V to +0.3V
All Other Pins to GND...............................................-0.3V to +6V
Core Output Short Circuit...........................................Continuous
Continuous Power Dissipation
16-Pin QSOP (derate 7.1mW/°C above +70°C)..........571mW
Operating Temperature.......................................-40°C to +85°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
ELECTRICAL CHARACTERISTICS (continued)(VIN= +12V, VMAIN= VINC= VCS-= VCS+= +3.3V, VCORE= +1.8V, Circuit of Figure 4, TA
= 0°C to +85°C,unless otherwise noted.
Typical values are at TA= +25°C.)
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
ELECTRICAL CHARACTERISTICS (continued)(VIN= +12V, VMAIN= VINC= VCS-= VCS+= +3.3V, VCORE= +1.8V, Circuit of Figure 4, TA
= 0°C to +85°C,unless otherwise noted.
ELECTRICAL CHARACTERISTICS(VIN= +12V, VMAIN= VINC= VCS-= VCS+= +3.3V, VCORE= +1.8V, Circuit of Figure 4, TA
-40°C to +85°C,unless otherwise noted.)
(Note 2)
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
ELECTRICAL CHARACTERISTICS (continued)(VIN= +12V, VMAIN= VINC= VCS-= VCS+= +3.3V, VCORE= +1.8V, Circuit of Figure 4, TA
-40°C to +85°C,unless otherwise noted.)
(Note 2)
Typical Operating Characteristics(Circuit of Figure 1, VMAIN= +3.3V, VCORE= +1.8V, TA = +25°C, unless otherwise noted.)
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
ELECTRICAL CHARACTERISTICS (continued)(VIN= +12V, VMAIN= VINC= VCS-= VCS+= +3.3V, VCORE= +1.8V, Circuit of Figure 4, TA
-40°C to +85°C,unless otherwise noted.)
(Note 2)
Note 1:This parameter is guaranteed based on the LXC P-channel current limit and the LXC N-channel valley current.
Note 2:Specifications to -40°C are guaranteed by design and not production tested.
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop ComputersREFERENCE LOAD REGULATION
MAX1775 toc04
IREF (µA)
REF
ACCURACY (%)
MAIN SWITCHING WAVEFORMS,
LIGHT LOAD (100mA)MAX1775 toc05
1µs/div
ILM
500mA/div
VMAIN
(AC-COUPLED)
20mV/div
LX
5V/div
MAIN SWITCHING WAVEFORMS,
HEAVY LOAD (1A)MAX1775 toc06
1µs/div
ILM
500mA/div
VMAIN
(AC-COUPLED)
20mV/div
LX
5V/div
500mA
1000mA
CORE SWITCHING WAVEFORMS,
LIGHT LOAD (50mA)MAX1775 toc07
1µs/div
ILC
200mA/div
VCORE
(AC-COUPLED)
20mV/div
LX
5V/div
200mA
CORE SWITCHING WAVEFORMS,
HEAVY LOAD (500mA)MAX1775 toc08
2µs/div
500mA
ILC
250mA/div
LXC
2V/div
VCORE
(AC-COUPLED)
20mV/div0
12V
MAIN LINE-TRANSIENT RESPONSE
(5V TO 12V)MAX1775 toc09
100µs/div
VIN
VMAIN
50mV/div
Typical Operating Characteristics (continued)(Circuit of Figure 1, VMAIN= +3.3V, VCORE= +1.8V, TA = +25°C, unless otherwise noted.)
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers3.3V
CORE LINE-TRANSIENT RESPONSE
(3.3V TO 5V)MAX1775 toc10
100µs/div
VINC
VCORE
50mV/div
1V/div
MAIN LOAD TRANSIENT
(LOAD FROM 100mA to 1A, VIN = 5V) MAX1775 toc11
200µs/div
IMAIN
VMAIN
50mV/div
400mA
MAIN LOAD TRANSIENT (IN DROPOUT
LOAD FROM 50mA TO 500mA)MAX1775 toc12
200µs/div
VMAIN
50mV/div
200mA
IMAIN
TURN-ON RESPONSE
(CIRCUIT OF FIGURE 4), NO LOADMAX1775 toc13
100µs/div
200mA
VCOREVMAIN
400mA
0mA
IINSHDNM
Typical Operating Characteristics (continued)(Circuit of Figure 1, VMAIN= +3.3V, VCORE= +1.8V, TA = +25°C, unless otherwise noted.)
