MAX1921 datasheet(4/9 Pages) MAXIM

Part #	MAX1921

Description	Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23

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Manufacturer	MAXIM [Maxim Integrated Products]

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Low-Voltage, 400mA Step-Down

DC-DC Converters in SOT23

4

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(CIN = 2.2µF ceramic, Circuit of Figure 1, components of Table 1, unless otherwise noted.)

10,000

1

0.1

1

100

1000

SWITCHING FREQUENCY vs. LOAD

(VOUT = 1.8V)

10

100

1000

LOAD (mA)

10

VIN = 3.3

10,000

1

0.1

1

100

1000

SWITCHING FREQUENCY vs. LOAD

(VOUT = 1.5V)

10

100

1000

LOAD (mA)

10

VIN = 3.3

NO LOAD SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

5..0

4.5

4.0

3.5

3.0

2.5

2.0

10

100

1000

10,000

1

1.5

5.5

VOUT = 3.3V

VOUT = 2.5V

VOUT = 1.5V

LIGHT-LOAD SWITCHING WAVEFORM

MAX1920 toc10

VOUT

AC-COUPLED

5mV/div

VLX

2V/div

1

µs/div

VIN = 3.3V, VOUT = 1.5V,

ILOAD = 40mA

MEDIUM-LOAD SWITCHING WAVEFORM

MAX1920 toc11

VOUT

AC-COUPLED

5mV/div

VLX

2V/div

1

µs/div

VIN = 3.3V, VOUT = 1.5V,

ILOAD = 250mA

SOFT-START AND SHUTDOWN RESPONSE

MAX1920 toc12

VOUT

1V/div

IIN

100mA/div

VSHDN

5V/div

200

µs/div

VIN = 3.3V, VOUT = 1.5V,

RLOAD = 6

Ω

MEDIUM-LOAD

LINE-TRANSIENT RESPONSE

MAX1920 toc13

VIN

AC-COUPLED

200mV/div

VOUT

AC-COUPLED

5mV/div

4

µs/div

VIN = 3.8V to 4.2V,

VOUT = 1.5V, ILOAD = 250mA

LIGHT-LOAD

LINE-TRANSIENT RESPONSE

MAX1920 toc14

VIN

AC-COUPLED

200mV/div

VOUT

AC-COUPLED

5mV/div

4

µs/div

VIN = 3.8V to 4.2V,

VOUT = 1.5V, ILOAD = 20mA

LOAD-TRANSIENT RESPONSE

MAX1920 toc15

VOUT

AC-COUPLED

100mV/div

ILOAD

200mA/div

IL

200mA/div

40

µs/div

VIN = 3.3V, VOUT = 1.5V,

ILOAD = 20mA TO 320mA

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