E-L4978D013TR, L4978, L4978D, L4978D013TR

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L4978
2A STEP DOWN SWITCHING REGULATOR
1

Features
UP TO 2A STEP DOWN CONVERTER OPERATING INPUT VOLTAGE FROM 8V TO 55V PRECISE 3.3V ( 1%) INTERNAL REFERENCE VOLTAGE OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz VOLTAGE FEEDFORWARD ZERO LOAD CURRENT OPERATION INTERNAL CURRENT LIMITING (PULSEBYPULSE AND HICCUP MODE) INHIBIT FOR ZERO CURRENT CONSUMPTION PROTECTION AGAINST FEEDBACK DISCONNECTION THERMAL SHUTDOWN SOFT START FUNCTION

Figure 1. Packages

DIP-8

SO16W

Table 1. Order Codes
Part Number L4978 L4978D L4978D013TR Package DIP-8 SO16 SO16 in Tape & Reel

efficency and high switching speed. A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today's applications. Features of this new generations of DCDC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown. The device is available in plastic dual in line, DIP8 for standard assembly, and SO16W for SMD assembly.

2

DESCRIPTION

The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25) to obtain very high Figure 2. Typical Application Circuit
Vi=8V to 55V 5 R1 20K 3 C1 220uF 63V C7 220nF C2 2.7nF 2 7

8

L4978
4 1 6 L1 126uH (77120) D1 ST PS3L60U C8 330uF VO=3.3V/2A

C5 100nF

R2 9.1K C4 22nF

C6 100nF

D98IN837A

May 2005

Rev. 9 1/13

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E-L4978D013TR DATASHEET