MAX1961 Просмотр технического описания (PDF) - Maxim Integrated

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MAX1961

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

Maxim Integrated 

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

Step-Down Controllers with Voltage Margining

ELECTRICAL CHARACTERISTICS

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

PARAMETER

VCC Input Voltage Range

VCC Input Voltage UVLO

VDD Input Voltage UVLO

Output Voltage

DC Output Accuracy

Positive Voltage-Margining Shift

Negative Voltage-Margining Shift

FB Input Bias Current

Feedback Transconductance

COMP Discharge Resistance

Switching Frequency

SYNC Frequency Range

Maximum Duty Cycle

Maximum Duty Cycle

Quiescent Supply Current

Shutdown Supply Current

VDD Output Voltage

Reference Voltage (No Load)

Positive Current-Limit Threshold

(VCS - VOUT)

Negative Current-Limit Threshold

(VOUT - VCS)

CS Bias Current

OUT Bias Current

Current-Limit Threshold (Positive

Direction, Fixed, VPGND - VLX)

Current-Limit Threshold (Negative

Direction, Fixed, VLX - VPGND)

Current-Limit Threshold (Positive

Direction, Adjustable, VPGND - VLX)

CONDITIONS

Rising or falling

Rising or falling

MAX1960/MAX1962 (measured at FB)

MAX1961/MAX1962

(FB = VDD),

measured at output

MAX1960/MAX1961

SEL = GND

SEL = REF

SEL not connected

SEL = VDD

MAX1960/MAX1961

In shutdown

FSET/SYNC = GND

FSET/SYNC = VCC

f = 1MHz

f = 500kHz

2.7V ≤ VVCC ≤ 5.5V, ILOAD = 1mA to 50mA

2.35V ≤ VVCC ≤ 2.7V, ILOAD = 1mA to 35mA,

C1 = 4.7µF, C6 = 22µF

2.35V ≤ VVCC ≤ 3.6V with tripler, ILOAD = 1mA

to 50mA (circuit of Figure 12)

MAX1962, VOUT = 2V

MIN TYP MAX UNITS

2.35

5.50

V

1.95

2.3

V

3.90

4.45

V

0.8

V

0.795

0.805

1.492

1.508

1.789

1.809

V

2.482

2.517

3.272

3.339

3.8

4.2

%

-3.8

-4.2

%

-0.2

+0.2

µA

1

3

mS

100

Ω

450

550

kHz

880

1120

450

1200 kHz

80

%

90

%

15

mA

15

µA

4.75

5.25

4.45

5.25

V

4.75

5.25

1.267

1.291

V

45

56

mV

MAX1962, VOUT = 2V

MAX1962, VCS = 3.3V

MAX1961/MAX1962, VOUT = 3.3V

MAX1960/MAX1961, ILIM = VDD

42

64

mV

50

µA

50

µA

58

90

mV

MAX1960/MAX1961, ILIM = VDD

MAX1960/MAX1961, RILIM = 160kΩ

RILIM = 400kΩ

50

85

mV

100

135

mV

250

306

4 _______________________________________________________________________________________

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