MAX1961 datasheet(7/29 Pages) MAXIM

Part #	MAX1961

Description	2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining

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Manufacturer	MAXIM [Maxim Integrated Products]

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7 / 29 page

2.35V to 5.5V, 0.5% Accurate, 1MHz PWM

Step-Down Controllers with Voltage Margining

_______________________________________________________________________________________

7

FREQUENCY vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

100

200

300

400

500

600

700

800

900

1000

1100

0

-40

85

FSET/SYNC = VCC

FSET/SYNC = GND

CHARGE-PUMP OUTPUT VOLTAGE

vs. CHARGE-PUMP LOAD CURRENT, 1MHz

CHARGE-PUMP LOAD CURRENT (mA)

150

100

50

4.6

4.7

4.8

VIN = 3.3V

VIN = 2.5V

4.9

5.0

5.1

5.2

4.5

0

200

C1 = 0.47

µF

C6 = 2.2

µF

CHARGE-PUMP OUTPUT VOLTAGE

vs. CHARGE-PUMP LOAD CURRENT, 500kHz

CHARGE-PUMP LOAD CURRENT (mA)

150

100

50

4.6

4.7

4.8

VIN = 3.3V

VIN = 2.5V

4.9

5.0

5.1

5.2

4.5

0200

C1 = 1

µF

C6 = 4.7

µF

TRIPLER CHARGE-PUMP OUTPUT VOLTAGE

vs. CHARGE-PUMP LOAD CURRENT, 1MHz

CHARGE-PUMP LOAD CURRENT (mA)

30

20

10

4.6

4.7

4.8

4.9

5.0

5.1

5.2

4.5

040

50

VIN = 2.5V

CIRCUIT OF FIGURE 12

C10, C11, C12 = 0.47

µF

C6 = 2.2

µF

TRIPLER CHARGE-PUMP OUTPUT VOLTAGE

vs. CHARGE-PUMP LOAD CURRENT, 500kHz

CHARGE-PUMP LOAD CURRENT (mA)

30

20

10

4.6

4.7

4.8

4.9

5.0

5.1

5.2

4.5

040

50

VIN = 2.5V

C10, C11, C12 = 1

µF

C6 = 4.7

µF

CIRCUIT OF FIGURE 12

MAX1960/MAX1961

CURRENT-LIMIT THRESHOLD

VOLTAGE vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

100

50

150

200

250

300

350

0

-40

85

RILIM = 390k

Ω

ILIM = VDD

MAX1962

CURRENT-LIMIT THRESHOLD

VOLTAGE vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

47.5

48.0

48.5

49.0

49.5

50.0

50.5

51.0

51.5

52.0

47.0

-40

85

Typical Operating Characteristics (continued)

(Circuit of Figure 9, TA = +25°C, unless otherwise noted.)

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