MAX1700EEE 查看數據表（PDF） - Maxim Integrated

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MAX1700EEE

1-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters

Maxim Integrated 

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

Low-Noise, Step-Up DC-DC Converters

ELECTRICAL CHARACTERISTICS (continued)

(CLK/SEL = ONA = ONB = FB = PGND = GND, OUT = POUT, VOUT = 3.6V, MAX1701: AIN = LBN = GND, LBP = REF,

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

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

LOGIC AND CONTROL INPUTS

Input Low Voltage (Note 7)

Input High Voltage (Note 7)

Input High Voltage (Note 7)

Logic Input Current

1.2V < VOUT < 5.5V, ONA and ONB

2.5V < VOUT < 5.5V, CLK/SEL

1.2V < VOUT < 5.5V, ONA and ONB

2.5V < VOUT < 5.5V, CLK/SEL

ONA, ONB, and CLK/SEL

0.8VOUT

0.8VOUT

-1

0.2VOUT

V

0.2VOUT

V

1

µA

Internal Oscillator Frequency CLK/SEL = OUT

260

340 kHz

Oscillator Maximum Duty Cycle

80

92

%

External Clock Frequency

Range

200

400 kHz

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 VOUT

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

Note 7: ONA and ONB have hysteresis of approximately 0.15xVOUT.

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

(TA = +25°C, unless otherwise noted.)

Typical Operating Characteristics

EFFICIENCY vs. LOAD CURRENT

(VOUT = 3.3V)

100

VIN = 2.4V

90

80

70

VIN = 1.2V

60 VIN = 0.9V

50

40

0.1

PFM

PWM

1

10

100

1000

LOAD CURRENT (mA)

EFFICIENCY vs. LOAD CURRENT

(VOUT = 5V)

100

VIN = 3.6V

90

80

VIN = 2.4V

70

60

VIN = 1.2V

50

40

30

0.1

PFM

PWM

1

10

100

1000

LOAD CURRENT (mA)

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0

0

MAX1701

SHUTDOWN CURRENT

vs. INPUT VOLTAGE (V)

T = 25°C

T = 85°C

T = -40°C

123456

INPUT VOLTAGE (V)

_______________________________________________________________________________________ 5

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