1.6V to 5.5V Input, 0.5% Accurate, Dual

180° Out-of-Phase Step-Down Controllers

4

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ELECTRICAL CHARACTERISTICS

noted.) (Note 5)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

MAX1955

2.25

5.50

IN Input Voltage Range

MAX1956 (Note 1)

1.6

5.5

V

MAX1955

1.9

2.2

IN Input Voltage UVLO

Rise or fall

MAX1956

1.30

1.58

V

FB Regulation Voltage

0.794

0.806

V

FB Regulation Voltage with

Positive Voltage Margining

Percentage change from nominal regulation voltage

+3

+5

%

FB Regulation Voltage with

Negative Voltage Margining

Percentage change from nominal regulation voltage

-5

-3

%

Line Regulation Error

(Note 2)

0.3

%

FB_ Input Bias

-0.2

+0.2

µA

Feedback Transconductance

1.0

3.1

mS

COMP_ Source Current

100

µA

COMP_ Sink Current

100

µA

COMP_ Pulldown Resistance

In shutdown

100

Ω

Step-Down Switching Frequency

SYNC = GND (Note 3)

540

660

kHz

SYNC Frequency Range

2 times step-down switching frequency

1080

1320

kHz

Maximum Duty Cycle

Measured at DH_

90

97

%

Minimum Duty Cycle

Measured at DH_

10

%

Total of VDD1 + VDD2 + AVDD current, SYNC = GND,

no load on DH_ or DL_

32

mA

IN Quiescent Supply Current

100

µA

IN Shutdown Supply Current

20

µA

REF Voltage

1.267

1.293

V

REF Load Regulation

0.01

V

Default Current-Limit Threshold

127.5

172.5

mV

Ω

60

90

Adjustable Current-Limit

Threshold

Measured from PGND to LX_

Ω

240

360

mV