MAX1974EUB ,Smallest 1A, 1.4MHz Step-Down RegulatorsELECTRICAL CHARACTERISTICS(V = V = 3.3V, FB = OUT, T = 0°C to +85°C, unless otherwise noted. Typica ..
MAX1974EUB+ ,Smallest 1A, 1.4MHz Step-Down RegulatorsApplicationsOrdering InformationNetwork EquipmentPART TEMP RANGE PIN-PACKAGECellular Base StationsM ..
MAX1974EUB+ ,Smallest 1A, 1.4MHz Step-Down Regulatorsapplications. Forced PWM operationensures a constant switching frequency over all load♦ Fixed-Frequ ..
MAX1974EUB+T ,Smallest 1A, 1.4MHz Step-Down RegulatorsFeaturesThe MAX1973/MAX1974 are constant-frequency 2♦ Tiny Circuit Footprint of 0.19in1.4MHz pulse- ..
MAX1976AETA130+T ,Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFNMAX1963A/MAX1976A19-3684; Rev 1; 5/12Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and ..
MAX1976AETA150+T ,Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFNELECTRICAL CHARACTERISTICS(V = (V + 0.5V) or 1.8V, whichever is greater; SHDN = IN, C = 1µF, C = 4. ..
MAX4951BECTP+ ,SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasisfeatures channel-independent digital preemphasis controls to drive SATA outputs over longer S Inlin ..
MAX4951BECTP+ ,SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasisfeatures high electrostatic discharge (ESD) Q8kV Human S Drive DetectionBody Model (HBM) protection ..
MAX4951BECTP+T ,SATA I/II/III Bidirectional Redriver with Input Equalization and PreemphasisApplicationsLaptop ComputersServersDesktop ComputersDocking StationsData Storage/Workstations ___ M ..
MAX4951BECTP+TGH7 ,SATA I/II/III Bidirectional Redriver with Input Equalization and PreemphasisELECTRICAL CHARACTERISTICS(V = +3.0V to +3.6V, C = 12nF, R = 50I, T = 0NC to +70NC, unless otherwis ..
MAX4951CCTP+ ,6Gbps SATA Bidirectional Redriver with Input Equalization, Preemphasis, and Advanced Power ManagementELECTRICAL CHARACTERISTICS(V = +3.0V to +3.6V, C = 10nF coupling capacitor on each output, R = 50I, ..
MAX4951CCTP+T ,6Gbps SATA Bidirectional Redriver with Input Equalization, Preemphasis, and Advanced Power ManagementApplicationsthe corresponding outputs. Inputs and outputs are all internally 50I terminated and mus ..
MAX1974EUB
Smallest 1A, 1.4MHz Step-Down Regulators
General DescriptionThe MAX1973/MAX1974 are constant-frequency
1.4MHz pulse-width-modulated (PWM) current-mode
step-down regulators. The output voltage can be set as
low as 0.75V using an external voltage-divider, or it can
be set to preset outputs of 1V, 1.5V (MAX1974), 1.8V,
or 2.5V (MAX1973) without requiring external resistors.
The MAX1973 also includes a voltage-margining fea-
ture that offsets the output voltage up or down 4% to
facilitate board-level production testing.
A fixed 1.4MHz operating frequency ensures operation
outside the DSL frequency band, provides fast transient
response, and allows the use of small external compo-
nents. Only 4.7µF input and output ceramic capacitors
are needed for 1A applications. Forced PWM operation
ensures a constant switching frequency over all load
conditions.
Output voltage accuracy is ±1% over load, line, and
temperature operating ranges. The MAX1973 features
voltage margining; the MAX1974 provides a POK out-
put to indicate when the output has reached 90% of its
nominal regulation voltage. Both devices are available
in small 10-pin µMAX packages.
ApplicationsNetwork Equipment
Cellular Base Stations
DSL and Wireless Modems/Routers
Optical Modules
Central-Office DSL and Telecom
DSP/ASIC Core and IO supplies
FeaturesTiny Circuit Footprint of 0.19in2Ultra-Low Circuit Height of 1.8mm4.7µF Ceramic Input and Output Capacitors2.6V to 5.5V Input Voltage1A Output Current1% AccurateBuilt-In ±4% Logic-Controlled Voltage Margining
(MAX1973)Preset 1V, 1.5V, 1.8V, 2.5V, or 0.75V to VIN
Adjustable OutputFixed-Frequency PWM Current-Mode Operation1.4MHz Switching Frequency, Operate Outside
DSL Band100% Duty-Cycle Dropout CapabilitySmall External Components
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
Pin Configurations
Ordering Information
Typical Operating Circuit19-2547; Rev 0; 7/02
Selector Guide appears at end of data sheet.
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
ABSOLUTE MAXIMUM RATINGSStresses 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, POK, CTL1, CTL2, FBSEL, ON to GND..............-0.3V to +6V
COMP, FB, SS to GND................................-0.3V to (VIN+ 0.3V)
PGND to GND.......................................................-0.3V to +0.3V
LX Current (Note 1)...............................................-2.4A to +2.4A
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C)..........444mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
Note 1:LX has internal clamp diodes to IN and PGND. Applications that forward bias these diodes should take care not to exceed
the IC package power dissipation limit.
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
ELECTRICAL CHARACTERISTICS (continued)(VIN= VCTL_= 3.3V, FB = OUT, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
ELECTRICAL CHARACTERISTICS (continued)(VIN= VCTL_= 3.3V, FB = OUT, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS(VIN= VFB= VCTL_= 3.3V, TA
= -40°C to +85°C, unless otherwise noted.) (Note 2)
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
ELECTRICAL CHARACTERISTICS
(VIN= VCTL_= 3.3V, FB = OUT, TA
= -40°C to +85°C, unless otherwise noted.) (Note 2)
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
Typical Operating Characteristics
(Circuits of Figure 2, 3, and 4; TA= +25°C, unless otherwise noted.)
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulatorsypical Operating Characteristics (continued)
(Circuits of Figure 2, 3, and 4; TA= +25°C, unless otherwise noted.)
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
MAX1974 WITH 100kΩ PULLUP RESISTOR
FROM POK TO IN, ILOAD = 100mA
MAX1974
POK AND INPUT VOLTAGE
VPOK
2V/div
MAX1973/74 toc15
20ms/div
VIN
1V/divVOUT
2V/div
VIN = 5V, VOUT = 2.5V, IOUT = 800mA, -4% TO +4% TO -4%
MAX1973
VOLTAGE MARGIN STEP CHANGE RESPONSE
VOUT
IIN
1V/div
MAX1973/74 toc14
500mA/div
1ms/div
VCTL1
VCTL2
10V/div
10V/divypical Operating Characteristics (continued)
(Circuits of Figure 2, 3, and 4; TA= +25°C, unless otherwise noted.)
