Dual 180° Out-of-Phase Buck Controllers with

Sequencing/Prebias Startup and POR

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

Ω,

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SYNC Range

Switching frequency must be set to half of the SYNC

frequency

200

1200

kHz

High

100

SYNC Input Pulse Width

(Note 4)

Low

100

ns

SYNC Rise/Fall Time

(Note 4)

100

ns

ERROR AMPLIFIER

FB_ Input Bias Current

250

nA

0°C to +85°C

0.985

1.00

1.015

FB_ Input Voltage Set Point

-40°C to +85°C

0.98

1.00

1.02

V

0°C to +85°C

1.25

1.8

2.70

FB_ to COMP_ Transconductance

-40°C to +85°C

1.2

1.8

2.9

mS

DRIVERS

DL_, DH_ Break-Before-Make Time

30

ns

Low

1.5

2.5

DH_ On-Resistance

High

3

5

Ω

Low

0.6

1.5

DL_ On-Resistance

High

3

5

Ω

LOGIC INPUTS (EN, SYNC)

Input Low Level

0.8

V

Input High Level

2.4

V

Input High/Low Bias Current

-1

+0.1

+1

µA

LOGIC OUTPUTS (CKO)

Output Low Level

0.4

V

Output High Level

4.0

V

COMP_

Pulldown Resistance During

Shutdown and Current Limit

17

Ω

RST OUTPUT (MAX1858A/MAX1876A ONLY)

Output-Voltage Trip Level

Both FBs must be over this to allow the reset timer to

start; there is no hysteresis

0.87

0.9

0.93

V

0.4

Output Low Level

0.3

V

Output Leakage

1

µA

Reset Timeout Period

140

315

560

ms

FB_ to Reset Delay

FB_ overdrive from 1V to 0.85V

4

µs

Note 1: Specifications to -40°C are guaranteed by design and not production tested.

can resume.

Note 4: Guaranteed by design and not production tested.