4V to 72V Input LDOs with Boost Preregulator

_______________________________________________________________________________________

3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Boost Internal Switch Maximum

On-Time

1.80

2.25

2.70

µs

Internal Switch Current Limit

Measured in steady-state condition

1.5

3.0

A

Boost Turn-On Response Time

to switch on-time

25

µs

Internal Diode Forward Voltage

Drop

0.95

V

LDO

Guaranteed Output Current

250

mA

3.25

3.3

3.35

SET = SGND,

MAX5092A/

MAX5093A

100µA

3.2

3.3

3.4

4.900

5

5.075

Output Voltage

SET = SGND,

MAX5092B/

MAX5093B

100µA

4.85

5

5.10

V

Minimum Adjustable Output

Voltage

1.5

V

MAX5092_,

9

Maximum Adjustable Output

Voltage

Boost operation,

MAX5093_,

10

V

Adjustable Output Voltage

(boost converter off) (Note 6)

1.5

10.0

V

Dropout Voltage

0.9

1.6

V

LDO Startup Response Time

Ω, SET = SGND

200

µs

MAX5092A/MAX5093A

0.4

7V

MAX5092B/MAX5093B

0.5

Line Regulation

7V

1.6

mV/V

SET Reference Voltage

1.205

1.235

1.265

V

SET Input Bias Current

0.5

100

nA

Load Regulation

0.2

0.6

mV/mA

f = 100Hz

80

Power-Supply Rejection Ratio

PSRR

f = 1MHz

60

dB

Short-Circuit Current

255

490

mA

ELECTRICAL CHARACTERISTICS (continued)