MAX1960 datasheet(4/29 Pages) MAXIM

Part #	MAX1960

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

Step-Down Controllers with Voltage Margining

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

(VVCC = 3.3V, Circuits of Figures 9–12, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC Input Voltage Range

2.35

5.50

V

VCC Input Voltage UVLO

Rising or falling

1.95

2.3

V

VDD Input Voltage UVLO

Rising or falling

3.90

4.45

V

Output Voltage

0.8

V

MAX1960/MAX1962 (measured at FB)

0.795

0.805

SEL = GND

1.492

1.508

SEL = REF

1.789

1.809

SEL not connected

2.482

2.517

DC Output Accuracy

MAX1961/MAX1962

(FB = VDD),

measured at output

SEL = VDD

3.272

3.339

V

Positive Voltage-Margining Shift

MAX1960/MAX1961

3.8

4.2

%

Negative Voltage-Margining Shift

MAX1960/MAX1961

-3.8

-4.2

%

FB Input Bias Current

-0.2

+0.2

µA

Feedback Transconductance

1

3

mS

COMP Discharge Resistance

In shutdown

100

Ω

FSET/SYNC = GND

450

550

Switching Frequency

FSET/SYNC = VCC

880

1120

kHz

SYNC Frequency Range

450

1200

kHz

Maximum Duty Cycle

f = 1MHz

80

%

Maximum Duty Cycle

f = 500kHz

90

%

Quiescent Supply Current

15

mA

Shutdown Supply Current

15

µA

2.7V

≤ VVCC ≤ 5.5V, ILOAD = 1mA to 50mA

4.75

5.25

2.35V

≤ VVCC ≤ 2.7V, ILOAD = 1mA to 35mA,

C1 = 4.7µF, C6 = 22µF

4.45

5.25

VDD Output Voltage

2.35V

≤ VVCC ≤ 3.6V with tripler, ILOAD = 1mA

to 50mA (circuit of Figure 12)

4.75

5.25

V

Reference Voltage (No Load)

1.267

1.291

V

Positive Current-Limit Threshold

(VCS - VOUT)

MAX1962, VOUT = 2V

45

56

mV

Negative Current-Limit Threshold

(VOUT - VCS)

MAX1962, VOUT = 2V

42

64

mV

CS Bias Current

MAX1962, VCS = 3.3V

50

µA

OUT Bias Current

MAX1961/MAX1962, VOUT = 3.3V

50

µA

Current-Limit Threshold (Positive

Direction, Fixed, VPGND - VLX)

MAX1960/MAX1961, ILIM = VDD

58

90

mV

Current-Limit Threshold (Negative

Direction, Fixed, VLX - VPGND)

MAX1960/MAX1961, ILIM = VDD

50

85

mV

MAX1960/MAX1961, RILIM = 160k

Ω

100

135

Current-Limit Threshold (Positive

Direction, Adjustable, VPGND - VLX)

RILIM = 400k

Ω

250

306

mV

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