MAX17543 datasheet(4/19 Pages) MAXIM

4 / 19 page

(VIN = VEN/UVLO = 24V, RRT = 40.2kΩ (500kHz), CVCC = 2.2μF, VPGND = VSGND = VMODE = VSYNC = 0V, LX = SS = RESET = open,

VBST to VLX = 5V, VFB = 1V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are

referenced to SGND, unless otherwise noted.) (Note 2)

Note 2: All limits are 100% tested at +25ºC. Limits over temperature are guaranteed by design.

Note 3: See the Overcurrent Protection/Hiccup Mode section for more details.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX UNITS

Hiccup Timeout

(Note 3)

32,768

Cycles

Minimum On-Time

tON-MIN

135

Minimum Off-Time

tOFF-MIN

140

160

LX Dead Time

RESET

RESET Output Level Low

IRESET = 10mA

0.4

RESET Output Leakage Current

TA = TJ = +25ºC, VRESET = 5.5V

-0.1

+0.1

µA

FB Threshold for RESET Assertion

VFB-OKF

VFB falling

90.5

94.6 %VFB-

REG

FB Threshold for RESET

Deassertion

VFB-OKR

VFB rising

93.8

97.8 %VFB-

REG

RESET Deassertion Delay After FB

Reaches 95% Regulation

1024

Cycles

THERMAL SHUTDOWN

Thermal Shutdown Threshold

Temperature rising

165

ºC

Thermal Shutdown Hysteresis

ºC

MAX17543

4.5V–42V, 2.5A, High-Efficiency,

Synchronous Step-Down DC-DC Converter

with Internal Compensation

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Electrical Characteristics (continued)

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