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RH1959MILDICE 4.5A, 500KHz Step-Down Switching Regulator

RH1959MILDICE 4.5A, 500KHz Step-Down Switching Regulator
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RH1959MILDICE 4.5A, 500KHz Step-Down Switching Regulator - 1

DICE/DWF SPECIFICATION RH1959MILDICE 4.5A, 500KHz Step-Down Switching Regulator PAD FUNCTION 1 2 3 GND VC SHDN FB SYNC BOOST VIN SW LTC Finished Part Number Order Part Number Please refer to LTC standard product data sheet for other applicable product information. *DWF = DICE in wafer form. 80mils × 138mils, Backside metal: Alloyed gold layer Backside potential: GND L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. DESCRIPTION The RH1959 is a 500kHz monolithic buck mode switching regulator with an on-die 4.5A switch. It can accept inputs up to 16VIN to generate outputs as low as 1.21VOUT. All necessary circuitry including oscillator, control logic, comparators, error amplifiers, and reference are included on die, keeping solution size minimal and saving external components. High switching frequency allows a considerable reduction in the size of external capacitors and inductor. The topology is current mode for fast transient response and good loop stability. A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. High efficiency is maintained over a wide output current range by keeping quiescent supply current to 4mA and by utilizing a boost capacitor to saturate the NPN power switch. Full cycleby-cycle short-circuit protection and thermal shutdown are provided for safe operation in overload conditions. A shutdown signal reduces supply current to 20µA while synchronization allows an external logic level signal to vary adjust switching frequency between 580kHz and 1MHz. ABSOLUTE MAXIMUM RATINGS Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

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RH1959MILDICE 4.5A, 500KHz Step-Down Switching Regulator - 2

DICE/DWF SPECIFICATION RH1959MILDICE DICE/DWF ELECTRICAL TEST LIMITS VC = 1.5V, Boost = VIN + 5V, switch open. (Note 2) For non-specified test conditions, TA = 25°C, TJ = 25°C, VIN = 5V, Feedback Voltage (Adjustable) Reference Voltage Line Regulation Feedback Input Bias Current Error Amplifier Voltage Gain (Note 3) Error Amplifier Transconductance (Note 9) Error Amplifier Source Current Error Amplifier Sink Current VFB = 1.35V Switch Current Limit (Note 9) Switch On Resistance (Notes 8, 9) Maximum Switch Duty Cycle VFB = 1.05V Switch Frequency VC Set to Give 50% Duty Cycle Switch Frequency...

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