Rainbow-electronics MAX1706 Manual de usuario descargar pdf (Pagina 8)

MAX1705/MAX1706

1- to 3-Cell, High-Current, Low-Noise,

Step-Up DC-DC Converters with Linear Regulator

8 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2, T

= +25°C, unless otherwise noted.)

200µs/div

MAX1705

LINE-TRANSIENT RESPONSE

MAX1705/6 TOC15

OUT

= 0mA, V

OUT

= 3.3V

A = V

, 1.5V TO 2.0V, 200mV/div

B = V

OUT,

10mV/div, 3.3V DC OFFSET

200µs/div

MAX1705

POWER-ON DELAY

(PWM MODE)

MAX1705/6 TOC17

= 1.2V, LOAD = 1kΩ

A = ONA, 2V/div

B = V

LDO

, 2V/div

C = V

OUT

, 2V/div

D = INDUCTOR CURRENT, 500mA/div

2.5V

3.3V

0mA

1µs/div

MAX1705

PWM SWITCHING WAVEFORMS

MAX1705/6 TOC18

= 1.2V, V

OUT

= 4.5V, V

LDO

= 3.3V, I

LDO

= 200mA

A = INDUCTOR CURRENT, 500mA/div

B = LX VOLTAGE, 5V/div

C = V

OUT

RIPPLE, 50m/div AC COUPLED

D = V

LDO

RIPPLE, 5m/div AC COUPLED

C5 = 0.33µF

OUT

LDO

2µs/div

MAX1705

PFM SWITCHING WAVEFORMS

MAX1705/6 TOC19

= 1.2V, V

OUT

= 4.5V, V

LDO

= 3.3V, I

LDO

= 40mA

A = INDUCTOR CURRENT, 500mA/div

B = LX VOLTAGE, 5V/div

C = V

OUT

RIPPLE, 50mV/div AC COUPLED

D = V

LDO

RIPPLE, 5mV/div AC COUPLED

C5 = 0.33µF

0mA

OUT

LDO

1ms/div

MAX1705

LINEAR-REGULATOR

OUTPUT NOISE

MAX1705/6 TOC20

LDO

IS AC COUPLED, 1mv/div

LDO

= 200mA

C5 = 0.33µF

LDO

DC TO 500kHz

200µs/div

MAX1705

LOAD-TRANSIENT RESPONSE

MAX1705/6 TOC16

= 1.2V, V

OUT

= 3.3V

A = V

OUT

, 50mV/div, 3.3V DC OFFSET

B = I

OUT

, 0mA TO 200mA, 200mA/div

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

MAX1705/MAX1706 1

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Rainbow-electronics MAX1706 Manual de usuario Pagina 8

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