MAX887HESA ,100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC ConverterELECTRICAL CHARACTERISTICS(V+ = +7V, PGND = GND = 0V, SHDN = V+, (T = 0°C to T ), unless otherwise ..
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MAX887HESA ,100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converterfeatures current-mode operation for supe-' 2.5µA Shutdown Moderior load/line-transient response. Cy ..
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MAX887HESA
100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter
_______________General DescriptionThe MAX887 high-efficiency, step-down DC-DC con-
verter provides an adjustable output from 1.25V to
10.5V. It accepts inputs from 3.5V to 11V and delivers
600mA. Operation to 100% duty cycle minimizes
dropout voltage (300mV typ at 500mA). Synchronous
rectification reduces output rectifier losses, resulting in
efficiency as high as 95%.
Fixed-frequency pulse-width modulation (PWM)
reduces noise in sensitive communications applica-
tions. Using a high-frequency internal oscillator allows
tiny surface-mount components to reduce PC board
area, and eliminates audio-frequency interference. A
SYNC input allows synchronization to an external clock
to avoid interference with sensitive RF and data-
acquisition circuits.
The MAX887 features current-mode operation for supe-
rior load/line-transient response. Cycle-by-cycle current
limiting protects the internal MOSFET and rectifier. A
low-current (2.5µA typ) shutdown mode conserves bat-
tery life.
________________________ApplicationsPortable Instruments
Cellular Phones and Radios
Personal Communicators
Distributed Power Systems
Computer Peripherals
____________________________Features95% Efficiency 600mA Output CurrentCycle-by-Cycle Current LimitingLow-Dropout, 100% Duty-Cycle Operation,
300mV at 500mAInternal 0.6Ω(typ) MOSFETInternal Synchronous RectifierHigh-Frequency Current-Mode PWMExternal SYNC or Internal 300kHz OscillatorGuaranteed 260kHz to 340kHz Internal Oscillator
Frequency Limits2.5µA Shutdown Mode
MAX887
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
__________________Pin Configuration
__________Typical Operating Circuit
MAX887
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(V+ = +7V, PGND = GND = 0V, SHDN= V+, (TA
= 0°C to TMAX), unless otherwise noted.) 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.
REF, FB, SYNC, VL to GND.....................................-0.3V to +6V
V+ to GND.............................................................-0.3V to +12V
SHDN, LX to GND.......................................-0.3V to (V+ + 0.3V)
PGND to GND......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA= +70°C)
SO (derate 9.09mW/°C above +70°C) .........................471mW
Operating Temperature Ranges
MAX887HC/D.......................................................0°C to +70°C
MAX887HESA...................................................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +165°C
Lead Temperature (soldering, 10sec)............................+300°C
Note 1:Guaranteed by design and not production tested.
MAX887
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
Note 2:Specifications from 0°C to -40°C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS(V+ = +7V, PGND = GND = 0V, SHDN= V+, (TA
= -40°C to +85°C), unless otherwise noted.) (Note 2)
__________________________________________Typical Operating Characteristics(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
LOAD CURRENT (mA)
DROPOUT VOLTAGE
vs. LOAD CURRENT MAX887-01
DROPOUT VOLTAGE (V)
MAX887
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
____________________________Typical Operating Characteristics (continued)(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
0.0001 0.0010.010.10.6
EFFICIENCY (%)
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENTMAX887-04
EFFICIENCY (%)
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENTMAX887-05
MAXIMUM OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGEMAX887-06
MAXIMUM OUTPUT CURRENT (mA)
SYNC FREQUENCY (kHz)
MAXIMUM OUTPUT CURRENT
vs. SYNC FREQUENCYMAX887-07
SWITCHING FREQUENCY (kHz)
SUPPLY VOLTAGE (V)
SWITCHING FREQUENCY
vs. SUPPLY VOLTAGEMAX887-10
QUIESCENT CURRENT (mA)
SUPPLY VOLTAGE (V)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGEMAX887-08
QUIESCENT CURRENT (mA)
TEMPERATURE (°C)
QUIESCENT CURRENT
vs.TEMPERATUREMAX887-09
FREQUENCY (kHz)
TEMPERATURE (°C)
SWITCHING FREQUENCY
vs. TEMPERATUREMAX887-11
-60-40-20020406080100120140
MAX887
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
____________________________Typical Operating Characteristics (continued)(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
MAX887
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
_____________________________Typical Operating Characteristics (continued)(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
