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General Description

The RTQ2963 is a 3.5A, high-efficiency, peak current mode

control asynchronous step-down converter which is

optimized for automotive applications. The device operates

with input voltages from 4V to 60V and is protected from

load dump transients up to 65V, eases input surge

protection design. The device can program the output

voltage between 0.8V to VIN. The low quiescent current

design with the integrated low RDS(ON) of high-side

MOSFET achieves high efficiency over the wide load range.

The peak current mode control with simple external

compensation allows the use of small inductors and

results in fast transient response and good loop stability.

The wide switching frequency of 100kHz to 2500kHz allows

for efficiency and size optimization when selecting the

output filter components. The ultra-low minimum on-time

enables constant-frequency operation even at very high

step-down ratios. For switching noise sensitive

applications, it can be externally synchronized from

300kHz to 2200kHz. The build-in spread-spectrum

frequency modulation further helping systems designers

with better EMC management.

The RTQ2963 provides complete protection functions such

as input under-voltage lockout, output under-voltage

protection, output over-voltage protection, over-current

protection, and thermal shutdown. Cycle-by-cycle current

limit provides protection against shorted outputs, and softstart

eliminates input current surge during start-up. The

RTQ2963 is available in WDFN-10L 4x4 and SOP-8

(Exposed pad) packages.

Features

? AEC-Q100 Grade 1 Qualified

? FMEA Compliant Pinout

? Wide Input Voltage Range

? 4.5V to 60V

? 4V to 60V (Soft-start is finished)

? Wide Output Voltage Range : 0.8V to VIN

? 0.8V ±1 Reference Accuracy

? Peak Current Mode Control

? Integrated 80mΩ High-Side MOSFET

? Low Quiescent Current : 100μA

? Low Shutdown Current : 2.25μA

? Adjustable Switching : 100kHz to 2.5MHz

? Synchronizable Switching : 300kHz to 2.2MHz

? Power Saving Mode (PSM) at Light Load

? Built-In Spread-Spectrum Frequency Modulation

? Low Dropout at Light Loads with Integrated Boot

Recharge FET

? Externally Adjustable Soft-Start by Part Number

Option

? Power Good Indication by Part Number Option

? Enable Control

? Adjustable UVLO Voltage and Hysteresis

? Adjacent Pin-Short Protection

? Built-In UVLO, UVP, OVP, OCP, OTP

Applications

? Automotive, Communications and Industrial 12V, 24V

and 48V Power Systems

? Industrial Automation and Motor Control

? Vehicle Accessories : GPS, Entertainment