Rainbow-electronics MAX1724 Manual de usuario descargar pdf (Pagina 5)

MAX1722/MAX1723/MAX1724

1.5µA I

, Step-Up DC-DC Converters

in Thin SOT23-5

_______________________________________________________________________________________ 5

Pin Description

1ms/div

SHDN

1V/div

SHUTDOWN RESPONSE

MAX1722 toc10

= 3.3V, V

OUT

= 5.0V, R

OUT

= 100

Ω

OUT

2V/div

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

-40 -15 10 35 60 85

SHUTDOWN INPUT THRESHOLD

vs. TEMPERATURE

MAX1722 toc11

TEMPERATURE (

SHUTDOWN THRESHOLD (mV)

RISING EDGE

FALLING EDGE

Typical Operating Characteristics (continued)

(Figure 3 (MAX1723), Figure 7 (MAX1722), Figure 8 (MAX1724), V

BATT

= V

= 1.5V, L = 10µH, C

= 10µF, C

OUT

= 10µF, T

= +25°C,

unless otherwise noted.)

MAX1724MAX1722

MAX1723

OUT

GND

SHDN

BATT

NAME

—

Power Output. OUT also provides bootstrap power to the IC.44

Internal N-channel MOSFET Switch Drain and P-Channel Synchronous

Rectifier Drain

Feedback Input to Set Output Voltage. Use a resistor-divider network to

adjust the output voltage. See Setting the Output Voltage section.

Ground22

Shutdown Input. Drive high for normal operation. Drive low for shutdown.1—

Battery Input and Damping Switch Connection—1

FUNCTION

200

s/div

A: V

OUT

, 50mV/div

B: I

OUT

, 20mA/div

LOAD-TRANSIENT RESPONSE

MAX1722 toc09

3.3V

50mA

1 2 3 4 5 6 7 8 9 10 11 12

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Rainbow-electronics MAX1724 Manual de usuario Pagina 5

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