MAX16955 datasheet(3/26 Pages) MAXIM

Part #	MAX16955

Description	36V, 1MHz Step-Down Controller with Low Operating Current

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Manufacturer	MAXIM [Maxim Integrated Products]

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36V, 1MHz Step-Down Controller

with Low Operating Current

_______________________________________________________________________________________

3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

FB Line Regulation

VEN = VSUP, 6V < VSUP < 36V (Note 4)

0.02

%/V

Transconductance (from FB to

COMP)

gm,EA

1200

μS

Error-Amplifier Output

Impedance

ROUT,EA

30

M

RFOSC = 76.8k

360

400

440

Operating Frequency

fSW

RFOSC = 30.1k

1000

kHz

Minimum On-Time

tON(MIN)

80

ns

Maximum FSYNC Frequency

fFSYNC(MAX)

1100

kHz

Minimum FSYNC Frequency

fFSYNC(MIN)

fFSYNC > 110% of internal frequency (20%

duty cycle), fSW = 220kHz

242

kHz

FSYNC Switching Threshold

High

VFSYNC,HI

1.4

V

FSYNC Switching Threshold Low

VFSYNC,LO

0.4

V

FSYNC Internal Pulldown

Resistance

1

M

CURRENT LIMIT

CS Input Current

ICS

VCS = VOUT = 0V or VBIAS (Note 4)

-1

+1

μA

During normal operation

22

Output Input Current

IOUT

VFB = VBIAS

32

μA

CS Current-Limit Voltage

Threshold

VLIMIT

VCS - VOUT, VBIAS = 5V, VOUT

2.5V

68

80

92

mV

FAULT DETECTION

Output Overvoltage Trip

Threshold

VFB,OV

VOUT = VFB, rising edge

108

113

118

%VFB

Output Overvoltage Trip

Hysteresis

2.5

%

Rising edge

25

Output Overvoltage Fault

Propagation Delay

tOVP

Falling edge

25

μs

Output Undervoltage Trip

Threshold

VFB,UV

VOUT = VFB; with respect to slewed FB

threshold, falling edge

83

88

93

%VFB

Output Undervoltage Trip

Hysteresis

2.5

%

Falling edge

25

Output Undervoltage

Propagation Delay

Rising edge (excluding startup)

25

μs

PGOOD Output Low Voltage

VPGOOD,L

ISINK = 3mA

0.4

V

PGOOD Leakage Current

IPGOOD

1

μA

Thermal Shutdown Threshold

TSHDN

(Note 5)

+175

°C

Thermal Shutdown Hysteresis

(Note 5)

15

°C

ELECTRICAL CHARACTERISTICS (continued)

(VSUP = VEN = 14V, CIN = 10μF, COUT = 94μF, CBIAS = 2.2μF, CBST = 0.1μF, RFOSC = 76.8k

Ω, TA = TJ = -40°C to +125°C, unless

otherwise noted. Typical values are at TA = +25°C.) (Note 2)

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