MAX1771ESA+T ,12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC ControllerApplicationsPortable CommunicatorsPin ConfigurationTypical Operating CircuitTOP VIEWINPUT 2V TO VOU ..
MAX1771ESA-T ,12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC ControllerELECTRICAL CHARACTERISTICS(V+ = 5V, I = 0mA, T = T to T , unless otherwise noted. Typical values ar ..
MAX1772EEI ,Low-Cost, Multichemistry Battery- Charger Building BlockMAX177219-1772; Rev 2; 5/02Low-Cost, Multichemistry Battery-Charger Building Block
MAX1772EEI+ ,Low-Cost, Multichemistry Battery-Charger Building BlockELECTRICAL CHARACTERISTICS✕(V = V = V = 18V, V = V = V = 12V, V = 3.0V, V = V = 0.75 V , V = 2.0V,D ..
MAX1772EEI+T ,Low-Cost, Multichemistry Battery-Charger Building BlockMAX177219-1772; Rev 4; 2/09Low-Cost, Multichemistry Battery-Charger Building Block
MAX1773AEUP ,Power Source Selector for Dual-Battery SystemsELECTRICAL CHARACTERISTICS(V = V = 16.8V, C = 3.3µF, V = 0.93V, V = V = 28V, V = 3V, V = V = 1.65V, ..
MAX4605CSE+ ,5Ω, Quad, SPST, CMOS Analog SwitchesApplicationsMAX4604EPE -40°C to +85°C 16 Plastic DIPReed Relay Replacement PBX, PABX SystemsOrderin ..
MAX4605ESE ,5 / Quad / SPST / CMOS Analog SwitchesFeaturesThe MAX4604/MAX4605/MAX4606 quad analog switch-' Low On-Resistance (5Ω max)es feature 5Ω ma ..
MAX4606ESE ,5 / Quad / SPST / CMOS Analog SwitchesApplicationsMAX4604EPE -40°C to +85°C 16 Plastic DIPReed Relay Replacement PBX, PABX SystemsOrderin ..
MAX4606ESE+ ,5Ω, Quad, SPST, CMOS Analog SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +15V, V- = -15V, V = 5V, V = 2.4V, V = 0.8V, T = T to ..
MAX4607CSE ,2.5 / Dual / SPST / CMOS Analog SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +15V, V- = -15V, V = +5V, V = +2.4V, V = +0.8V, T = T ..
MAX4609CSE ,2.5 / Dual / SPST / CMOS Analog Switchesapplications where current switching is♦ Guaranteed ESD Protection > 2kV required. They have low po ..
MAX1771CPA+-MAX1771CSA+-MAX1771CSA-T-MAX1771ESA+-MAX1771ESA+T-MAX1771ESA-T
12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
General DescriptionThe MAX1771 step-up switching controller provides
90% efficiency over a 30mA to 2A load. A unique cur-
rent-limited pulse-frequency-modulation (PFM) control
scheme gives this device the benefits of pulse-width-
modulation (PWM) converters (high efficiency at heavy
loads), while using less than 110µA of supply current (vs.
2mA to 10mA for PWM converters).
This controller uses miniature external components. Its
high switching frequency (up to 300kHz) allows sur-
face-mount magnetics of 5mm height and 9mm diame-
ter. It accepts input voltages from 2V to 16.5V. The
output voltage is preset at 12V, or can be adjusted
using two resistors.
The MAX1771 optimizes efficiency at low input voltages
and reduces noise by using a single 100mV current-limit
threshold under all load conditions. A family of similar
devices, the MAX770–MAX773, trades some full-load
efficiency for greater current-limit accuracy; they provide
a 200mV current limit at full load, and switch to 100mV
for light loads.
The MAX1771 drives an external N-channel MOSFET
switch, allowing it to power loads up to 24W. If less power
is required, use the MAX756/MAX757 or MAX761/MAX762
step-up switching regulators with on-board MOSFETs.An
evaluation kit is available.
ApplicationsPositive LCD-Bias Generators
Flash Memory Programmers
High-Power RF Power-Amplifier Supply
Palmtops/Hand-Held Terminals
Battery-Powered Applications
Portable Communicators
Features90% Efficiency for 30mA to 2A Load CurrentsUp to 24W Output Power110µA (max) Supply Current5µA (max) Shutdown Current2V to 16.5V Input RangePreset 12V or Adjustable Output VoltageCurrent-Limited PFM Control SchemeUp to 300kHz Switching FrequencyEvaluation Kit Available
Ordering Information
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
Pin Configurationypical Operating Circuit19-0263; Rev 2; 3/02
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883B.
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
ABSOLUTE MAXIMUM RATINGSSupply Voltage
V+ to GND...............................................................-0.3V, 17V
EXT, CS, REF, SHDN, FB to GND...................-0.3V, (V+ + 0.3V)
GND to AGND.............................................................0.1V, -0.1V
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C)............727mW
SO (derate 5.88mW/°C above +70°C).........................471mW
CERDIP (derate 8.00mW/°C above +70°C).................640mW
Operating Temperature Ranges
MAX1771C_A.....................................................0°C to +70°C
MAX1771E_A..................................................-40°C to +85°C
MAX1771MJA................................................-55°C to +125°C
Junction Temperatures
MAX1771C_A/E_A.......................................................+150°C
MAX1771MJA..............................................................+175°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°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.
ELECTRICAL CHARACTERISTICS(V+ = 5V, ILOAD= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
ELECTRICAL CHARACTERISTICS (continued)(V+ = 5V, ILOAD= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Note 1:Output voltage guaranteed using preset voltages. See Figures 4a–4d for output current capability versus input voltage.
Note 2:Output voltage line and load regulation depend on external circuit components.
ypical Operating Characteristics(TA = +25°C, unless otherwise noted.)
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
Typical Operating Characteristics (continued)(Circuit of Figure 2a, TA = +25°C, unless otherwise noted.)
