MAX1947ETA18 ,Low Input/Output Voltage Step-Up DC-DC Converter with RESETApplications♦ Uses Only Small Ceramic CapacitorsMP3 Players, Pagers, and CD Players♦ 75ms RESET Out ..
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MAX1947ETA18
Low Input/Output Voltage Step-Up DC-DC Converter with RESET
General DescriptionThe MAX1947 is a compact, high-efficiency, step-up DC-
DC converter that regulates output voltages from 1.8V to
3.3V to power µP/DSP cores, memory, and I/O rails in 1-
and 2-cell alkaline/NiMH/NiCd battery-powered systems.
It features an internal 800mA switch and synchronous
rectifier to achieve up to 94% efficiency and to eliminate
the need for an external Schottky diode.
High-frequency switching (up to 2MHz) results in low
ripple and small external components, while automatic
pulse skipping at light loads reduces supply current to
just 70µA for extended battery life. Maxim’s proprietary
True Shutdown™ reduces supply current to just 2µA
and fully discharges the output to ground. The convert-
er is offered in fixed-output voltages of 1.8V, 2.5V, 3.0V,
and 3.3V, requiring no feedback or compensation net-
work. A 75ms RESEToutput flag provides for power-on
reset (POR) and undervoltage detection. The MAX1947
is available in a space-saving 8-pin TDFN package.
ApplicationsMP3 Players, Pagers, and CD Players
PDAs and Organizers
Digital Still Cameras
Cordless Phones
Wireless Mice/Keyboards
Portable Medical Equipment
Other Battery-Powered Systems
FeaturesLow Input (0.7V) and Output (1.8V) Voltage
CapabilityInternal Synchronous RectifierHigh 94% EfficiencyFixed Output Voltages: 1.8V, 2.5V, 3V, and 3.3VUp to 2MHz Switching Allows Small External
Components and Low Output RippleAutomatic Pulse Skipping at Light Loads for
Extended Battery LifeLow 70µA (typ) Operating Supply Current
(Measured at OUT)Low 2µA Logic-Controlled ShutdownTrue Shutdown Fully Discharges Output to
GroundUses Only Small Ceramic Capacitors75ms RESETOutput Flag
MAX1947
Low Input/Output Voltage
Step-Up DC-DC Converter with RESET
Pin Configuration
Ordering Information
Typical Application Circuit*xy represents the output voltage code (e.g., 18 =1.8V).
Standard output voltages include 3.3V (33), 3.0V (30), 2.5V
(25), and 1.8V (18). Contact the factory for other output voltages
in 100mV increments between 1.8V and 3.3V; the minimum
order quantity is 25,000 units.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
MAX1947
Low Input/Output Voltage
Step-Up DC-DC Converter with RESET
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICSStresses 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.
Note 1:LX has internal clamp diodes to PGND and OUT. Applications that forward bias these diodes should take care not to exceed the
IC’s package power-dissipation limits.
BATT, OUT, SHDNto GND...................................-0.3V to +4.0V
RESETto GND..........................................-0.3V to (VOUT + 0.3V)
PGND to GND.......................................................-0.3V to +0.3V
Switch Current (ILX, IOUT, IPGND) (Note 1).................-1A to +1A
Continuous Power Dissipation (TA = +70°C)
8-Pin TDFN (derate 24.4mW/°C
above +70°C)..........................................................1951.2mW
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
MAX1947
Low Input/Output Voltage
Step-Up DC-DC Converter with RESET
Note 2:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 3:When BATT is greater than the output-voltage set point, the part is in track mode (see the Track Modesection).
ELECTRICAL CHARACTERISTICS (continued)(VBATT = 1.5V, TA = -40°C to +85°C,unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
MAX1947
Low Input/Output Voltage
Step-Up DC-DC Converter with RESET
Typical Operating Characteristics(VIN= 1.5V, Circuit of Typical Application Circuit, TA = +25°C, unless otherwise noted.)
MAX1947
Low Input/Output Voltage
Step-Up DC-DC Converter with RESET
Typical Operating Characteristics (continued)(VIN= 1.5V, Circuit of Typical Application Circuit, TA = +25°C, unless otherwise noted.)
