MAX1775EEE+-MAX1775EEE+T-MAX1775EEE-T Fast Delivery |IC PHOENIX CO.,LIMITED

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 ..
MAX1775EEE-T ,Dual-Output Step-Down DC-DC Converter for PDA/Palmtop ComputersFeaturesThe MAX1775 dual, step-down DC-DC converter gen-♦ Dual, High-Efficiency, Synchronous Rectif ..
MAX1776EUA ,24V, 600mA Internal Switch, 100% Duty Cycle, Step-Down ConverterFeaturesThe MAX1776 high-efficiency step-down converter pro- Fixed 5V or Adjustable Outputvides an ..
MAX1776EUA ,24V, 600mA Internal Switch, 100% Duty Cycle, Step-Down ConverterApplications Ordering InformationNotebook ComputersPART TEMP RANGE PIN-PACKAGEDistributed Power Sys ..
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
MAX4613EEE ,Quad, SPST Analog SwitchApplications' Low Power Consumption (35µW max)®Sample-and-Hold Circuits Communication Systems' Rail ..
MAX4613EEE+ ,Quad, SPST Analog Switchfeatures on-resis-♦ Pin Compatible with Industry-Standard DG213tance matching (4Ω max) between swit ..
MAX4613EPE ,Quad, SPST Analog SwitchELECTRICAL CHARACTERISTICS—Dual Supplies (continued)(V+ = 15V, V- = -15V, V = 5V, GND = 0V, V = 2.4 ..

MAX1775EEE+-MAX1775EEE+T-MAX1775EEE-T
Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
General Description
The MAX1775 dual, step-down DC-DC converter gen-
erates 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 synchronous recti-
fiers to achieve efficiencies up to 95%. Operation with
up to 100% duty cycle provides the lowest 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.
________________________Applications
Hand-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 Current55µA Shutdown CurrentDigital Soft-StartIndependent Shutdown Inputs
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
SHDNMLXC
INC
GND
FBC
CS-
CS+
FBM
REF
TOP VIEW
MAX1775
16 QSOP
SHDNC
PGND
NDRV
CVL
PDRV
CVH
Pin Configuration
19-1811; Rev 2; 4/09
EVALUATION KIT
AVAILABLE
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX1775EEE-40°C to +85°C16 QSOP
SHDNM
IN 2.7V TO 5.5V (28V IN CASCADE)
CVH
CORE
1.8V
1.5A
MAIN
3.3V
OVER 2A
SHDNC
OFF
OFF
NDRV
CS+
CS-
INC
FBM
LXC
FBC
CVL
REF
PGND
GND
PDRV
MAX1775
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input VoltageVIN2.728V
Input Quiescent Supply CurrentIINVFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V1530µA
CS- Quiescent Supply CurrentICS-VFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V110220µA
Core Regulator Quiescent
Supply CurrentIINCVFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V60120µA
IN Shutdown Supply CurrentSHDNM = SHDNC = GND530µA
MAIN REGULATOR
Main Output Voltage Adjust
Range1.255.5V
FBM Regulation ThresholdVFBMV ( C S + - C S - ) = 0 to + 60m V , V IN = + 2.7V to + 28V 1.211.251.29V
FBM Input CurrentIFBMVFBM = +1.3V-0.10.1µA
Current-Limit ThresholdVCLMVCS+ - VCS-6080100mV
Minimum Current-Limit
ThresholdVMINVCS+ - VCS-61524mV
Valley Current ThresholdVVALLEYVCS+ - VCS-405060mV
Zero Current ThresholdVZEROVCS+ - VCS-015mV
PDRV, NDRV Gate Drive
ResistanceVCS- = +3.3V, ILOAD = 50mA24.4Ω
CS- to CVL Switch ResistanceICVL = 50mA4.58Ω
PDRV, NDRV Dead Time50ns
Maximum Duty Cycle100%
Minimum On-Time200400650ns
Minimum Off-Time200400650ns
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.)
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
Maximum Duty Cycle100%
Minimum On-Time200650ns
Minimum Off-Time200650ns
CORE REGULATOR
Input Voltage RangeVINC2.65.5V
VINC rising2.392.55INC Undervoltage LockoutVINC falling2.292.45V
Core Output Voltage Adjust
Range1.05.0V
Maximum Core Load Current(Note 1)1A
FBC Regulation ThresholdVFBCVINC = +2.5V to +5.5V, IOUTC = 0 to 200mA0.971.03V
FBC Input CurrentIFBCVFBC = +1.3V-0.10.1µA
Dropout Voltage (INC to LXC)IOUTC = 400mA0.2V
LXC Leakage CurrentILXCVINC = +5.5V, VLXC = 0 to +5.5V-1010µA
LXC P-Channel, N-Channel
On-Resistance0.5Ω
LXC P-Channel Current Limit12003050mA
LXC P-Channel Minimum
Current100400mA
LXC N-Channel Valley Current8802450mA
LXC N-Channel Zero-Crossing
Current35175mA
Maximum Duty Cycle100%
Minimum On-Time150670ns
Minimum Off-Time150670ns
REFERENCE
Reference VoltageVREF1.221.27V
Reference Load RegulationIREF = 0 to 50µA10mV
Reference Line RegulationVCS- = +2.5V to +5.5V,
IREF = 50µA5mV
Reference Sink CurrentIREF10µA
CVL, CVH REGULATORS
CVL Output VoltageVCVLICVL = 50mA, VIN = +2.7V, VCS- = 0V2.63.1V
VIN = +4V, ICVH = 25mAV IN - 2.8CVH Output VoltageVCVHVIN = +12V, ICVH = 50mAVIN - 3.7V
VCVL rising2.402.55CVL Undervoltage LockoutVCVL falling2.302.45V
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
LOGIC INPUTS
SHDNM, SHDNC Input Low
Voltage0.4V
SHDNM, SHDNC Input High
Voltage2.0V
SHDNM, SHDNC Input Low
CurrentSHDNM = SHDNC = GND-11µA
SHDNC Input High CurrentV SHDNC = +5.5V5µA
V SHDNM = +5V2SHDNM Input High CurrentV SHDNM = +28V1530µA
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.)
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)
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
Input VoltageVIN2.728V
Input Quiescent Supply CurrentIINVFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V30µA
CS- Quiescent Supply CurrentICS-VFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V220µA
Core Regulator Quiescent
Supply CurrentIINCVFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V120µA
IN Shutdown Supply CurrentSHDNM = SHDNC = GND30µA
MAIN REGULATOR
Main Output Voltage Adjust
Range1.255.5V
FBM Regulation ThresholdVFBMV ( C S + - C S - ) = 0 to + 60m V , V I N = + 2.7V to + 28V 1.211.29V
FBM Input CurrentIFBMVFBM = +1.3V-0.10.1µA
Current-Limit ThresholdVCLVCS+ - VCS-60100mVi ni m um C ur r ent- Li m i t Thr eshol d VCS+ - VCS-624mV
Valley Current ThresholdVCS+ - VCS-4060mV
Zero Current ThresholdVCS+ - VCS-015mV
PDRV, NDRV Gate Drive
ResistanceVCS- = +3.3V4.4Ω
CS- to CVL Switch ResistanceICVL = 50mA8Ω
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)
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
Maximum Duty Cycle100%
Minimum On-Time200650ns
Minimum Off-Time200650ns
CORE REGULATOR
Input Voltage RangeVINC2.65.5V
VINC rising2.392.55INC Undervoltage LockoutVINC falling2.292.45V
Core Output Voltage Adjust
Range1.05.0V
Maximum Core Load Current(Note 1)1A
FBC Regulation ThresholdVFBCVINC = +2.5V to +5.5V, IOUTC = 0 to 200mA0.971.03V
FBC Input CurrentIFBCVFBC = +1.3V-0.10.1µA
Dropout Voltage (INC to LXC)IOUTC = 400mA0.2V
LXC Leakage CurrentILXCVINC = +5.5V, VLXC = 0 to +5.5V-1010µA
LXC P-Channel, N-Channel
On-Resistance0.5Ω
LXC P-Channel Current Limit12003050mA
LXC P-Channel Minimum
Current100400mA
LXC N-Channel Valley Current8802450mA
LXC N-Channel Zero-Crossing
Current35175mA
Maximum Duty Cycle100%
Minimum On-Time150670ns
Minimum Off-Time150670ns
REFERENCE
Reference VoltageVREF1.221.27V
Reference Load RegulationIREF = 0 to 50µA10mV
Reference Line RegulationVCS- = +2.5V to +5.5V,
IREF = 50µA5mV
Reference Sink CurrentIREF10µA
CVL, CVH REGULATORS
CVL Output VoltageVCVLICVL = 50mA, VIN = +2.7V, VCS- = 0V2.63.1V
VIN = +4V, ICVH = 25mAV IN - 2.8CVH Output VoltageVCVHVIN = +12V, ICVH = 50mAVIN - 3.7V
VCVL rising2.402.55CVL Undervoltage LockoutVCVL falling2.302.45V
10010100100010,000
MAIN OUTPUT EFFICIENCY vs. LOAD
MAX1775 toc01
LOAD (mA)
EFFICIENCY (%)40
VIN = +12VVIN = +15VVIN = +18V
VIN = +5V
VIN = +3.3V90100010010
CORE OUTPUT EFFICIENCY vs. LOAD
MAX1775 toc02
LOAD (mA)
EFFICIENCY (%)
VINC = +3.3VVINC = +5V
VINC = +2.7V
VREF ACCURACY vs. TEMPERATURE
MAX1775 toc03
TEMPERATURE (°C)
REF
ACCURACY (%)
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
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
LOGIC INPUTS
SHDNM, SHDNC Input Low
Voltage0.4V
SHDNM, SHDNC Input High
Voltage2.0V
SHDNM, SHDNC Input Low
CurrentSHDNM = SHDNC = GND-11µA
SHDNC Input High CurrentV SHDNC = +5.5V5µA
SHDNM Input High CurrentV SHDNM = +28V30µA
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 Computers
REFERENCE 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 Computers
3.3V
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
100mA
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 LOAD
MAX1775 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.)

Partno	Mfg	Dc	Qty	Available	Descript
MAX1775EEE+ \|MAX1775EEE	MAX	N/a	60	avai	Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
MAX1775EEE+T \|MAX1775EEET	MAXIM	N/a	5000	avai	Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
MAX1775EEE+T \|MAX1775EEET	MAX	N/a	10	avai	Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
MAX1775EEE-T \|MAX1775EEET	MAXIM	N/a	529	avai	Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
MAX1775EEE-T \|MAX1775EEET	MAXI	N/a	685	avai	Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers