Low-Cost, Dual-Output, Step-Down

Controller with Fast Transient Response

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3

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PROTECTION FEATURES

0.75

Overvoltage Protection (OVP)

Threshold

≤ 1.3V

REFIN2

+ 0.15

V

0.500

0.525

0.550

V

Power-Good (PWRGD) Threshold

Hysteresis

5

%

High-Side Current-Sense Program

Current (Note 3)

445060

µA

0.1

1.0

ILIM Leakage

0.1

µA

High-Side Current-Sense

Overcurrent Trip Adjustment Range

0.05

0.40

V

Internal Soft-Start Time

Ω, 400kHz

2.5

ms

REFIN2 Internal Pulldown Resistance

Engaged momentarily at startup

10

20

Ω

Thermal-Shutdown Threshold

Junction temperature

+160

°C

DRIVER SPECIFICATIONS

1.35

2.1

Sourcing current,

1.55

0.9

1.4

DH_ Driver Resistance

Sinking current,

1.0

Ω

1.3

2

Sourcing current,

1.5

0.6

1.1

DL_ Driver Resistance

Sinking current,

0.7

Ω

13

25

43

Dead Time for Low-Side to

High-Side Transition

DL_ falling to DH_ rising

28

ns

DH_ Minimum On-Time

70

108

149

ns

1.25

2.3

mA

BST Current

OSC/EN12 not connected

0.001

µA

Internal Boost Switch Resistance

6

Ω

PWM CLOCK OSCILLATOR

PWM Clock-Frequency Accuracy

-15

+15

%

PWM Clock-Frequency Adjustment

Range

Ω to 22.6kΩ

100

1000

kHz

OSC/EN12 Disable Current

1.5

2.5

µA

ELECTRICAL CHARACTERISTICS (continued)

Note 2: Specifications at -40°C are guaranteed by design and not production tested.

Note 3: This current linearly compensates for the MOSFET temperature coefficient.