Miniature, Low-Voltage,

Precision Step-Down Controller

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5

10

-10

0.01

10

1

0.1

LOAD REGULATION

vs. LOAD CURRENT

-2

-6

-8

6

8

4

0

-4

2

LOAD CURRENT (A)

0

0.3

0.2

0.1

0.4

0.5

0.6

0

40

30

10 20

50 60 70 80 90 100

REF LOAD-REGULATION ERROR

vs. REF LOAD CURRENT

REF LOAD CURRENT (

µA)

900

0

0.01

10

1

0.1

DROPOUT VOLTAGE

vs. LOAD CURRENT

300

200

100

700

800

600

400

500

LOAD CURRENT (A)

20mV/div

INDUCTOR

CURRENT

1A

0V

5V

0A

SWITCHING WAVEFORMS

(PWM MODE)

MAX1637-13

1

µs/div

50mV/div

LOAD

CURRENT

0A

2A

4A

LOAD-TRANSIENT RESPONSE

(3.3V/3A, PWM MODE)

MAX1637 TOC11

100

µs/div

50mV/div

5A LOAD CURRENT

0A

10A

LOAD-TRANSIENT RESPONSE

(1.8V, PWM MODE)

MAX1637 TOC12

100

µs/div

50mV/div

INDUCTOR

CURRENT

1A

0V

5V

0A

SWITCHING WAVEFORMS

(PFM MODE)

MAX1637-14

20

µs/div

1

µs/div

SWITCHING WAVEFORMS

DROPOUT OPERATION

MAX1637-15

10mV/div

2V/div

INDUCTOR

CURRENT

1A

0A

____________________________________Typical Operating Characteristics (continued)