MAX1945R Просмотр технического описания (PDF) - Maxim Integrated

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MAX1945R

1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators

Maxim Integrated 

1MHz, 1% Accurate, 6A Internal Switch

Step-Down Regulators

Typical Operating Characteristics (continued)

(VIN = VCC = 5V, VOUT = 1.8V, IOUT = 6A, fSW = 500kHz, VDD = VCC, and TA = +25°C, unless otherwise noted.)

PGND-MEASURED TEMPERATURE

vs. OUTPUT CURRENT

140

120

AMBIENT TEMP:

100

+85°C

AMBIENT TEMP:

80

+25°C

60

40

20 VCC = VIN = 5V

VOUT = 1.8V

0

6.0

6.5

AMBIENT TEMP:

0°C

7.0

7.5

8.0

OUTPUT CURRENT (A)

REFERENCE VOLTAGE vs. TEMPERATURE

2.030

2.025

2.020

2.015

2.010

2.005

2.000

-40 -15

VIN = VCC = 5V

fSW = 500kHz

10 35 60 85 110 135

TEMPERATURE (°C)

OUTPUT SHORT-CIRCUIT CURRENT

vs. INPUT VOLTAGE

12

10

8

6

4

2

fSW = 500kHz

0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

INPUT VOLTAGE (V)

TRANSIENT RESPONSE

VIN = 5V

MAX1945 toc12

TRANSIENT RESPONSE

VIN = 3.3V

MAX1945 toc13

SWITCHING WAVEFORM

VIN = 5V

MAX1945 toc14

VOUT

100mV/div

4.5A

IOUT

1A/div

1.5A

VOUT

100mV/div

4.5A

IOUT

1A/div

1.5A

VLX

5V/div

ILX

2A/div

VOUT

100mV/div

20µs/div

20µs/div

400ns/div

STARTUP WAVEFORMS

MAX1945 toc15

VOUT

0.5V/div

IIN

2A/div

1ms/div

VCTL1, CTL2

SHUTDOWN WAVEFORMS

MAX1945 toc16

VOUT

0.5V/div

VOLTAGE MARGINING (4%)

MAX1945 toc17

VCTL1

2V/div

6A RESISTIVE LOAD

40µs/div

IIN,

2A/div

VCTL1, VCTL2

200µs/div

VOUT

100mV/div

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