L494 MULTIFUNCTION OLTAGE REGULATOR FOR CAR RADIO PROGRAMMABLE OUTPUTS: TO (00mA); TO (00mA); TO (00mA) STANDBY OUT AND OUT2 WITH INDEPENDENT EN- ABLE CONTROL FOR STAND-BY MODE 0.4A HIGH SIDE DRIER LOAD DUMP PROTECTION THERMAL SHUTDOWN DESCRIPTION The L494 contains a triple voltage regulator and a high side driver. In stand-by the output is active as long as possible even when in thermal shutdown or under any other fault conditions. The STCAP pin allows the use of a reserve supply capacitor that will hold enough energy for the BLOCK DIAGRAM ST CAP EN EN2 2 2 GEN FILTER CAP REF Stand-by line to allow the µp to store data. MEM ( ) 0.A ADJ ( ) 0.A ADJ2 ( ) 0.A Multiwatt ORDERING NUMBER: L494 MEM MEM_feed 0 9 4 ADJ ADJ_feed ADJ2 ADJ2_feed S 4 LOAD DUMP 6 8 P-GND S-GND TAB D9AU668B December 2000 /6
L494 ABSOLUTE MAXIMUM RATINGS Symbol Parameter alue Unit S DC Operating Supply oltage -0.6 to 0 Transient Supply Overvoltage (0ms) 0 I O oltage Regulator Output Current Internally limited in Input oltage (EN, EN2) 0 to 6 RESR Output Capacitor Series Eq. Resistance 0.2 to 0 Ω P tot Power Dissipation (T case = 8 C) W T op Operating Temperature Range -40 to 8 C T stg Storage Temperature Ranges - to 0 C PIN CONNECTION (t.b.d.) TAB CONNECTED TO PIN 8 THERMAL DATA Symbol Parameter alue Unit R Th j-case Thermal Resistance Junction to Case 2 C/W 4 2 0 9 8 TAB 6 4 2 D9AU64A FILTER CAP 2 feed feed ST CAP MEM MEM_feed 2 P-GND S S-GND EN2 EN 2/6
L494 ELECTRICAL CHARACTERISTICS (Referred to Test & Application Circuit; S = 4.4; Tamb = 2 C; unless otherwise specified). Symbol Parameter Test Condition Min. Typ. Max. Unit STAND-BY out Mem Output oltage no load; +R/R2 = 2.4 no load; +R/R2 = 4 no load; +R/R2 =.6 line Line Regulation no load; <s<8 0 m load Load Regulation ma < I O < 00mA 8 80 m dropout Dropout oltage I O = 200mA, O = I O = 00mA, O = I lim Current Limit Out short to GND 0 800 000 ma I qst-by Quiescent Current I O = 00µA; EN = EN2 =0 I O = 00mA; EN = EN2 = 0. 0 0. 2 ma ma ADJUSTABLE REG SWITCHED outadj Output oltage no load; +R/R4 = 2.4 no load; +R/R4 = 4 no load; +R/R4 = 8.8 2.8 4. 0.4..2. line Line Regulation no load 0. m/ load Load Regulation ma < I O < 00mA 8 80 m dropout Dropout oltage I O = 200mA, O = I O = 00mA, O = I O = 200mA, O = I O = 00mA, O = 0.4. 0.4 0.6. 0..4 I lim Current Limit Out short to GND 0 800 000 ma I q2 Quiescent Current I O = 00mA 0 2 ma SR Supply oltage Rejection f = 0. to 0kHz, O = 4 db EN on EN ADJ ON 2 EN off EN ADJ OFF ADJUSTABLE REG2 SWITCHED outadj Output oltage no load; +R/R4 = 2.4 no load; +R/R6 = 4 no load; +R/R4 = 8.8 2.8 4. 0.4..2. line Line Regulation no load 0. m/ load Load Regulation ma < I O < 00mA 2 80 m dropout Dropout oltage I O = 200mA, O = I O = 00mA, O = I O = 200mA, O = I O = 00mA, O = 0.4. 0.4 0.6. 0..4 I lim Current Limit Out short to GND 0 800 00 ma I q Quiescent Current I O = 00mA 0 2 ma SR Supply oltage Rejection f = 0. to 0kHz, O = 4 db EN2H on2 EN ADJ2 ON. EN2H off2 EN ADJ2 OFF 0. 400mA SWITCHED dropout Dropout oltage I O = 400mA, 9 < S < 6 0.2 0.6 I lim Current Limit 0.4 0.6 0.8 A I qhsd Quiescent Current I O = 400mA 0 2 ma EN2 on H EN ON 2. EN2 off H EN OFF. EN2 Gap EN ON minus EN ADJ2 ON 2.8 4. 6.6 0.6 0.9..2. 0..2 /6
L494 Figure. Application circuit. 0µF 40µF S ST CAP EN EN2 2 2 GEN REF MEM ( ) 0.A LOAD DUMP 6 FILTER CAP P-GND S-GND TAB ADJ ( ) 0.A ADJ2 ( ) 0.A 8 0 9 4 4 D9AU62B MEM MEM_feed ADJ ADJ_feed ADJ2 ADJ2_feed R R2 R R4 R R6 0µF 0µF 0µF 4/6
L494 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A 0.9 B 2.6 0.04 C.6 0.06 D 0.09 E 0.49 0. 0.09 0.022 F 0.66 0. 0.026 0.00 G.02.2.2 0.040 0.00 0.060 G..8 8.0 0.690 0.00 0.0 H 9.6 0.2 H2 20.2 0.9 L 2.9 22.2 22. 0.862 0.84 0.886 L 2. 22. 22. 0.84 0.80 0.886 L2.6 8. 0.69 0. L.2.. 0.69 0.689 0.699 L4 0. 0. 0.9 0.406 0.42 0.429 L 2.6 2.9 0.04 0.4 M 4.2 4. 4.8 0.6 0.9 0.9 M 4.6.08. 0.82 0.200 0.28 S.9 2.6 0.0 0.02 S.9 2.6 0.0 0.02 Dia.6.8 0.44 0.2 OUTLINE AND MECHANICAL DATA Multiwatt /6
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