MAX1765(2000) Просмотр технического описания (PDF) - Maxim Integrated

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MAX1765
(Rev.:2000)

800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator

Maxim Integrated 

800mA, Low-Noise, Step-Up DC-DC Converter

with 500mA Linear Regulator

(TA = +25°C, unless otherwise noted.)

LDO PSRR vs. FREQUENCY

(100Hz TO 1MHz)

0

-10

-20

-30

-40

-50

-60

-70

-80

0.1

1

10

100

1000

FREQUENCY (kHz)

LINE TRANSIENT RESPONSE

(LINEAR)

MAX1765 toc13

Typical Operating Characteristics (continued)

BOOST FOLLOWED BY LDO

OUTPUT NOISE SPECTRUM

16

VIN = +2.4V

14 VOUT = +3.3V

12

10

8

6

4

2

0

LINE TRANSIENT RESPONSE

(DC-DC)

MAX1765 toc12

A

B

0.1

1

10

FREQUENCY (MHz)

LOAD TRANSIENT RESPONSE

MAX1765 toc14

100µs/div

A: VIN, 500mV/div

VOUT = +3.3V, I = 0mA

B: VOUT, 1mV/div, AC-COUPLED VIN = +1.4V TO +2.4V

TURN-ON WAVEFORMS

NO SOFT-START COMPONENTS

MAX1765 toc15a

A

A

A

B

B

B

C

I = 0mA, VIN = +3V TO +5V, VOUT = +3.3V

A: VIN, 2V/div

B: VOUT, 5mV/div, AC-COUPLED

50µs/div

VIN = +2.4V, VOUT = +3.3V, IOUT = 0 TO 500mA

A: IOUT, 500mA/div

B: VOUT,100mV/div

SOFT-START WAVEFORMS

(RSS = 500kΩ, CSS = 0.1µF)

MAX1765 toc15b

A: 0NA, 5V/div

B: VOUT, 2V/div

C: INPUT CURRENT, 1A/div

HEAVY-LOAD SWITCHING WAVEFORMS

(IOUT = 650mA, VIN = +2.4V, VOUT = 3.3V)

MAX1765 toc16

A

A

B

B

C

C

2.5ms/div

A: 0NA, 5V/div

B: INPUT CURRENT, 100mA/div

C: VOUT, 1V/div

A: LX, 5V/div

500ns/div

B: INDUCTOR CURRENT, 200mA/div

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

8 _______________________________________________________________________________________

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