TPS54494PWPG4中文资料德州仪器数据手册PDF规格书

1FEATURES

2• D-CAP2™ Control Mode

– Fast Transient Response

– No External Parts Required For Loop

Compensation

– Compatible with Ceramic Output

Capacitors

• Wide Input Voltage Range : 4.5 V to 18 V

• Output Voltage Range : 0.76V to 7V

• Highly Efficient Integrated FETs Optimized for

Low Duty Cycle Applications

– 90 mΩ (High Side) and 60 mΩ (Low Side)

• High Initial Reference Accuracy

• 4A CH1 / 2A CH2 Continuous Load Current

• Low-Side r DS(on) Loss-Less Current Sensing

• Fixed Soft Start : 1 ms

• Non-Sinking Pre-Biased Soft Start on•

Powergood

• 700 kHz Switching Frequency

• Cycle-by-Cycle Over-Current Limit Control

• OCL/UVLO/TSD Protections

• Hiccup Timer for Overload Protection

• Adaptive Gate Drivers with Integrated Boost

PMOS Switch

• OCP Constant Due To Thermally Compensated

rDS(on) with 4000ppm/℃

• 16-Pin HTSSOP, 16-Pin VQFN

• Auto-Skip Eco-mode™　for High Efficiency at

Light Load

APPLICATIONS

• Point-of-Load Regulation in Low Power

Systems for Wide Range of Applications

– Digital TV Power Supply

– Networking Home Terminal

– Digital Set Top Box (STB)

– DVD Player/Recorder

– Gaming Consoles and Other

DESCRIPTION

The TPS54494 is a dual, adaptive on-time D-CAP2™

mode synchronous buck converter. The TPS54494 enables system designers to complete the suite of

various end equipment’s power bus regulators with a

cost effective, low component count, and low standby

current solution. The main control loops of the

TPS54494 use the D-CAP2™ mode control which

provides a very fast transient response with no

external compensation components. The adaptive on•

time control supports seamless transition between

PWM mode at higher load conditions and Eco- mode™ operation at light loads. Eco-mode™ allows

the TPS54494 to maintain high efficiency during

lighter load conditions. The TPS54494 is able to

adapt to both low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP, and

ultra-low ESR, ceramic capacitors. The device

provides convenient and efficient operation with input

voltages from 4.5V to 18V.

The TPS54494 is available in a 4.4 mm × 5 mm 16-

pin TSSOP (PWP) and 4 mm x 4 mm 16-pin VQFN

(RSA) package, and is specified for an ambient

temperature range from –40°C to 85°C.