MAX1709 datasheet(6/12 Pages) MAXIM

6 / 12 page

4A, Low-Noise, High-Frequency,

Step-Up DC-DC Converter

_______________________________________________________________________________________

100

150

200

250

300

SWITCH CURRENT LIMIT

vs. SS/LIM RESISTANCE

SS/LIM RESISTANCE (k

Ω)

8.0

9.0

8.5

10.0

9.5

11.0

10.5

11.5

-40

-15

356085

SWITCH CURRENT LIMIT

vs. TEMPERATURE

TEMPERATURE (

°C)

VOUT = 3.3V

Typical Operating Characteristics (continued)

(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)

LINE-TRANSIENT

RESPONSE

MAX1709-14

3.5V

IOUT = 1A

100

µs/div

VOUT

50mV/div

VIN

0.5V/div

LOAD-TRANSIENT

RESPONSE

MAX1709-15

µs/div

2A/div

IOUT

2A/div

VOUT

100mV/div

SHUTDOWN WITH SOFT-START

(CSS = 0.1

µF)

MAX1709-16

1ms/div

VOUT

2V/div

VONA

5V/div

IIN

2A/div

CSS = 0.1

µF

ROUT = 5

Ω

VONB = VOUT

HEAVY SWITCHING WAVEFORM

MAX1709-13a

IOUT = 2A

µs/div

2A/div

VOUT

100mV/div

VLX

5V/div

HEAVY SWITCHING WAVEFORM

(WITH LC FILTER)

MAX1709-13b

IOUT = 2A

L = 12.5nH (COILCRAFT A04T)

C = 1

µF

µs/div

2A/div

VOUT

100mV/div

VLX

5V/div

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