1MHz, 1% Accurate, 6A Internal Switch

Step-Down Regulators

_______________________________________________________________________________________

9

PGND-MEASURED TEMPERATURE

vs. OUTPUT CURRENT

OUTPUT CURRENT (A)

7.5

7.0

6.5

20

40

60

80

100

120

140

0

6.0

8.0

AMBIENT TEMP:

+85

°C

AMBIENT TEMP:

0

°C

AMBIENT TEMP:

+25

°C

REFERENCE VOLTAGE vs. TEMPERATURE

TEMPERATURE (

°C)

110

85

60

35

10

-15

2.005

2.010

2.015

2.020

2.025

2.030

2.000

-40

135

OUTPUT SHORT-CIRCUIT CURRENT

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

2

4

6

8

10

12

0

2.5

5.5

TRANSIENT RESPONSE

MAX1945 toc12

20

µs/div

100mV/div

4.5A

1A/div

1.5A

TRANSIENT RESPONSE

MAX1945 toc13

20

µs/div

100mV/div

4.5A

1A/div

1.5A

SWITCHING WAVEFORM

MAX1945 toc14

400ns/div

5V/div

2A/div

100mV/div

STARTUP WAVEFORMS

MAX1945 toc15

0.5V/div

2A/div

1ms/div

SHUTDOWN WAVEFORMS

MAX1945 toc16

0.5V/div

2A/div

40

µs/div

6A RESISTIVE LOAD

VOLTAGE MARGINING (4%)

MAX1945 toc17

200

µs/div

2V/div

100mV/div

Typical Operating Characteristics (continued)