Rainbow-electronics MAX17031 Manual do Utilizador descarregar pdf (Página 9)

MAX17031

Dual Quick-PWM Step-Down Controller with Low-

Power LDO and RTC Regulator for MAIN Supplies

_______________________________________________________________________________________ 9

STANDBY AND SHUTDOWN INPUT

SUPPLY CURRENT vs. INPUT VOLTAGE

MAX17031 toc10

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

2051015

0.01

0.1

0.001

025

+ I

STANDBY

(ONLDO = RTC, ON1 = ON2 = GND)

SHUTDOWN

(ONLDO = ON1 = ON2 = GND)

REFERENCE OFFSET

VOLTAGE DISTRIBUTION

MAX17031 toc11

2V OFFSET VOLTAGE (mV)

SAMPLE PERCENTAGE (%)

12-12 -4 4

-20 20

= +85

= +25

SAMPLE SIZE = 150

100mV ILIM THRESHOLD

VOLTAGE DISTRIBUTION

MAX17031 toc12

ILIM THRESHOLD VOLTAGE (mV)

SAMPLE PERCENTAGE (%)

10694 98 102

90 110

SAMPLE SIZE = 150

= +85

= +25

LDO AND RTC POWER-UP

MAX17031 toc13

A. INPUT SUPPLY, 5V/div

B. 5V LDO, 2V/div

C. 3.3V RTC, 2V/div

D. 1.0 REF, 1V/div

200µs/div

12V

3.3V

2.0V

LDO AND RTC POWER REMOVAL

MAX17031 toc14

A. INPUT SUPPLY, 5V/div

B. 5V LDO, 2V/div

C. 3.3V RTC, 2V/div

D. 2.0 REF, 1V/div

200µs/div

3.3V

12V

3.3V

2.0V

5V LDO LOAD TRANSIENT

MAX17031 toc15

A. LDO OUTPUT, 100mV/div

B. LDO CURRENT, 100mA/div

4µs/div

0.1A

5V SMPS STARTUP AND SHUTDOWN

MAX17031 toc16

A. 5V LDO OUTPUT, 0.2V/div

B. 5V SMPS OUTPUT, 2V/div

C. ON1, 5V/div

200µs/div

C. PGOOD, 5V/div

D. INDUCTOR CURRENT,

5A/div

STARTUP WAVEFORMS

(SWITCHING REGULATORS)

MAX17031 toc17

A. ON1, 5V/div

B. 5V SMPS OUTPUT,

2V/div

200µs/div

SKIP MODE

C. PGOOD, 2V/div

D. INDUCTOR CURRENT,

5A/div

SHUTDOWN WAVEFORMS

(SWITCHING REGULATORS)

MAX17031 toc18

A. ON1, 5V/div

B. 5V SMPS OUTPUT,

2V/div

200µs/div

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

= 12V, V

= V

= 5V, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 23 24

MAX17031 1

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