Rainbow-electronics MAX1701 Manual de usuario descargar pdf (Pagina 5)

Input High Voltage (Note 7)

MAX1700/MAX1701

1-Cell to 3-Cell, High-Power (1A),

Low-Noise, Step-Up DC-DC Converters

_______________________________________________________________________________________ 5

Note 1: Operating voltage. Since the regulator is bootstrapped to the output, once started it will operate down to 0.7V input.

Note 2: Start-up is tested with the circuit of Figure 2.

Note 3: In low-power mode (CLK/SEL = GND), the output voltage regulates 1% higher than low-noise mode (CLK/SEL = OUT or

synchronized).

Note 4: The regulator is in start-up mode until this voltage is reached. Do not apply full load current.

Note 5: Load regulation is measured from no-load to full load where full load is determined by the N-channel switch current limit.

Note 6: Supply current from the 3.30V output is measured between the 3.30V output and the OUT pin. This current correlates

directly to the actual battery supply current, but is reduced in value according to the step-up ratio and efficiency. Set V

OUT

= 3.6V to keep the internal switch open when measuring the current into the device.

Note 7: ONA and ONB have hysteresis of approximately 0.15xV

OUT

Note 8: Specifications to -40°C are guaranteed by design and not production tested.

ELECTRICAL CHARACTERISTICS (continued)

(CLK/SEL = ONA = ONB = FB = PGND = GND, OUT = POUT, V

OUT

= 3.6V, MAX1701: AIN = LBN = GND, LBP = REF,

= -40°C to +85°C, unless otherwise noted.) (Note 8)

CONDITIONS

2.5V < V

OUT

< 5.5V, CLK/SEL

1.2V < V

OUT

< 5.5V, ONA and ONB

0.2V

OUT

0.2V

OUT

Input Low Voltage (Note 7)

1.2V < V

OUT

< 5.5V, ONA and ONB

0.8V

OUT

Input High Voltage (Note 7)

ONA, ONB, and CLK/SEL

2.5V < V

OUT

< 5.5V, CLK/SEL

µA-1 1Logic Input Current

0.8V

OUT

CLK/SEL = OUT kHz260 340Internal Oscillator Frequency

UNITSMIN TYP MAXPARAMETER

%80 92Oscillator Maximum Duty Cycle

kHz200 400

External Clock Frequency

Range

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

100

0.1 1 10 100 1000

EFFICIENCY vs. LOAD CURRENT

OUT

= 3.3V)

MAX1700-01

LOAD CURRENT (mA)

EFFICIENCY (%)

PFM

PWM

= 0.9V

= 1.2V

= 2.4V

MAX1700-02

100

0.1 1 10 100 1000

EFFICIENCY vs. LOAD CURRENT

OUT

= 5V)

LOAD CURRENT (mA)

EFFICIENCY (%)

= 1.2V

= 2.4V

= 3.6V

PFM

PWM

2.0

1.0

4.0

3.0

6.0

5.0

7.0

0231 456

MAX1701

SHUTDOWN CURRENT

vs. INPUT VOLTAGE (V)

MAX1770-03

INPUT VOLTAGE (V)

SHUTDOWN CURRENT (µA)

T = 85°C

T = 25°C

T = -40°C

LOGIC AND CONTROL INPUTS

1 2 3 4 5 6 7 8 9 10 ... 15 16

MAX1700/MAX1701 1

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Rainbow-electronics MAX1701 Manual de usuario Pagina 5

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