Note 1: All limits at -40°C are guaranteed by design, not production tested.

Note 2: For total current consumption during switching (at no load), also see the Typical Operating Characteristics.

Note 3: Switch current at which the current-limit circuit is activated.

Note 4: Limits are guaranteed by design.

PARAMETER

SYMBOL CONDITIONS

MIN

TYP

MAX

UNITS

INTERNAL SWITCH/CURRENT LIMIT

Peak Switch Current Limit

(Note 3)

2.4

3.3

5.0

A

Switch Leakage Current

-10

+10

µA

Switch On-Resistance

0.26

0.4

Ω

PFM Threshold

Minimum switch current in any cycle

1

60

300

mA

PFM Threshold

Minimum switch current in any cycle at

14

300

mA

FB Input Bias Current

-150

+0.1

+150

nA

ON/OFF CONTROL INPUT

ON/OFF Input-Voltage

Threshold

1.180

1.38

1.546

V

ON/OFF Input-Voltage

Hysteresis

100

mV

ON/OFF Input Current

10

100

nA

OSCILLATOR/SYNCHRONIZATION

Oscillator Frequency

106

127

150

kHz

Synchronization

119

200

kHz

Maximum Duty Cycle

80

95

%

SYNC High-Level Voltage

2.0

V

SYNC Low-Level Voltage

0.8

V

SYNC Minimum Pulse Width

350

ns

SYNC Input Leakage

-1

+1

µA

INTERNAL VOLTAGE REGULATOR

Regulator Output Voltage

7.0

7.8

8.4

V

Dropout Voltage

0.5

V

Load Regulation

10

Ω

PACKAGE THERMAL CHARACTERISTICS

Thermal Resistance

(Junction to Ambient)

TQFN package (JEDEC 51)

30

°C/W

THERMAL SHUTDOWN

Thermal-Shutdown Junction

Temperature

Temperature rising

+175

°C

Thermal-Shutdown

Hysteresis

20

°C

MAX5090A/B/C

2A, 76V, High-Efficiency MAXPower

Step-Down DC-DC Converters

www.maximintegrated.com

Maxim Integrated │ 3

Electrical Characteristics (continued)