MAX1760HEUB+T中文资料(4)

0.8A, Low-Noise, 1MHz, Step-Up DC-DC ConverterMAX1760/MAX1760H

ELECTRICAL CHARACTERISTICS (continued)

(CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT= 3.6V, TA= -40°C to +85°C,unless otherwise noted.) (Note 7)

to 0.7V input.

Note 2:Startup is tested with the circuit shown in Figure 6.Note 3:Defines maximum step-up ratio.

Note 4:The regulator is in startup mode until this voltage is reached. Do not apply full load current until the output exceeds 2.3V.Note 5:Supply current into 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.

Note 6:ON(MAX1760) and ON (MAX1760H) have a hysteresis of approximately 0.15 ×VOUT.Note 7:Specifications to -40°C are guaranteed by design and not production tested.

Typical Operating Characteristics

(Circuit of Figure 2, VIN= 2.4V, VOUT= 3.3V, TA= +25°C, unless otherwise noted.)

EFFICIENCY vs. OUTPUT CURRENT

VOUT = 3.3V

9080EFFICIENCY (%)

706050403020100

0.0001

0.001

0.01

0.1

1EFFICIENCY vs. OUTPUT CURRENT

VOUT = 5V

9080EFFICIENCY (%)

7060504030201000.0001

0.001

0.01

0.1

1

MAXIMUM OUTPUT CURRENT

vs. INPUT VOLTAGE

0.8OUTPUT CURRENT (A)

0.70.60.50.40.30.20.10.5

1.0

1.52.02.53.0INPUT VOLTAGE (V)

3.5

4.0

100100

0.9

OUTPUT CURRENT (A)

OUTPUT CURRENT (A)

4_______________________________________________________________________________________

Step-Up DC-DC Converter

0.8A, Low-Noise, 1MHz,Typical Operating Characteristics (continued)

(Circuit of Figure 2, VIN= 2.4V, VOUT= 3.3V, TA= +25°C, unless otherwise noted.)

NO-LOAD BATTERY CURRENT

TOTAL SHUTDOWN CURRENT vs. INPUT VOLTAGE

INTERNAL OSCILLATOR(ILX + IOUT) vs. INPUT VOLTAGE

FREQUENCY vs. TEMPERATURE

2.5105

01.20

6

0-0-6076171XXA1.15MAM2.0)

1.10)

AAnm()

z(TH T1.5

NNEM1.05ER( RRYRUC1.00UC1

N CNE TWUQ0.95U1.0

OEPDRNTFIU0.90H0.5

S0.850.80

0.0

0.1

1

2

3

4

5

0123456

0.75

-40

-15

10

35

60

85

INPUT VOLTAGE (V)

INPUT VOLTAGE (V)

TEMPERATURE (°C)

STARTUP VOLTAGE vs. OUTPUT CURRENT

PEAK INDUCTOR CURRENT vs. VISET

HEAVY-LOAD SWITCHING WAVEFORMS

3.01.4

8

9

00--00667711XX2.5AA1.2MM)

A( )

VT(N1.0A

EG2.0

ERARTLOUC 0.8

V P1.5ROTB

UCTU0.6RDATS1.0NI KA0.4EPC0.5

0.20V

0.00.0

0.0010.01

0.11

0.1

0.3

0.5

0.70.9

1.1

1.3

A = LX PIN, 5V/div

OUTPUT CURRENT (A)

VISET (V)

B = INDUCTOR CURRENT, 200mA/div

C = OUTPUT RIPPLE, 50mV/div AC-COUPLEDt = 400ns/div

LIGHT-LOAD SWITCHING WAVEFORMS

LOAD-TRANSIENT RESPONSE

LINE-TRANSIENT RESPONSE

1

2

111---000666777111XXXAAAMMMAAA

B

CBB

t = 400ns/div

t = 200ms/div

400µs/div

A = LX PIN, 5V/div

VIN = 1.1V, VOUT = 3.3V, IOUT = 0 AND 0.2AVIN = 2.4V TO 1.4V, IOUT = 70mAB = INDUCTOR CURRENT, 200mA/div

A = IOUT, 100mA/div

A = VIN, 1V/div

C = OUTPUT RIPPLE, 50mV/div, AC-COUPLED

B = VOUT, 50mV/div, AC-COUPLED

B = VOUT, 5mA/div, AC-COUPLED

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MAX1760/MAX1760H