RH3083MK DICE/DWF Adjustable 2.8A Single Resistor Low Dropout Regulator

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1 RH383MK DICE/DWF Adjustable.8A Single Resistor Low Dropout Regulator Features n Outputs May Be Paralleled for Higher Current and Heat Spreading n Single Resistor Sets Output oltage n Output Adjustable to n µa SET Pin Current: % Initial Accuracy n Total Ionizing Dose (TID) Tolerance, per TM9.8, MIL-STD-883 up to: krad (Si), per Condition A, at Rads(Si)/sec krad (Si), per Condition D, at mrads(si)/sec ELDRS Pass krad(si) n Single Event Latchup (SEL) Threshold Linear Energy Transfer (LET) Me cm /mg at T CASE = C n MIL-PRF-38 Class Compliant Description The RH383 is a.8a low dropout linear regulator with a unique architecture featuring a precision current source and voltage follower which allows the output to be programmed to any voltage between zero and 8. Multiple regulators can be paralleled to increase total output current and spread heat over a system PC board with no need for heat sinking. The pass transistor collector can be brought out independently of the circuit supply voltage to allow dropout voltage to approach the saturation limit of the pass transistor. A small µf capacitor on the output with an ESR of less than Ω is adequate to ensure stability. Applications with large output load transients require a larger output capacitor value to minimize output voltage change. Input circuitry ensures output safe operating area current limiting and thermal shutdown protection. The rated output current of an RH383-based part is fixed by internal wire length/resistance. Linear Technology dice element evaluations are based on parts rated for.8a output current. Dice Pinout 3 66mils x 3mils Backside metal: Alloyed gold (K) layer Backside potential: OUT Tie SENSE to OUT PAD FUNCTION. IN. OUT 3. SENSE. SET. CONTROL DIE CROSS REFERENCE LTC Finished Part Number RH383MK RH383MK Order Part Number RH383MK DICE RH383MK DWF* Please refer to LT 383 standard product data sheet for other applicable product information. *DWF = DICE in wafer form. Absolute Maximum Ratings (Note ) (All voltages relative to OUT ) CONTROL Pin oltage...±8 IN Pin oltage...8,.3 No Overload or Short-Circuit...3,.3 SET Pin Current (Note 6)...± SET Pin oltage (Relative to OUT, Note 6)... ± Output Short-Circuit Duration... Indefinite Operating Junction Temperature Range (Notes, )... C to C Storage Temperature Range... 6 C to C 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. rh383mkfa

2 RH383MK DICE/DWF Table. DICE/DWF Electrical Test Limits T A = C (Notes,, 8, 9, ) PARAMETER CONDITIONS MIN MAX UNITS SET Pin Current (Note 6) IN =, CONTROL =, I LOAD = 9. µa Output Offset oltage ( OUT SET ) IN =, CONTROL =, I LOAD = m Load Regulation, I SET I LOAD = to 3 3 na Load Regulation, OS I LOAD = to m Line Regulation, I SET IN = to 3, CONTROL = to, I LOAD = na/ Line Regulation, OS IN = to 3, CONTROL = to, I LOAD =.8.8 m/ Minimum Load Current (Note 3) IN =, CONTROL = IN = 3, CONTROL = CONTROL Dropout oltage (Note ) IN =, I LOAD =. IN Dropout oltage (Note ) CONTROL =, I LOAD = m CONTROL Pin Current (Note ) IN =, CONTROL =, I LOAD = 6. rh383mkfa

3 Table. Electrical Characteristics (Preirradiation) (Notes, 9, ) PARAMETER CONDITIONS RH383MK DICE/DWF T A = C SUB- C < T A < C MIN MAX GROUP MIN MAX SUB- GROUP SET Pin Current (Note 6) IN =, CONTROL =, I LOAD = µa Output Offset oltage ( OUT SET ) IN =, CONTROL =, I LOAD = 6 6 m Load Regulation, I SET I LOAD = to.8a 3 3 na Load Regulation, OS I LOAD = to.8a 3 3 m Line Regulation, I SET IN = to 3, CONTROL = to, I LOAD = IN = to 3, CONTROL = to, I LOAD = Line Regulation, OS IN = to 3, CONTROL = to, I LOAD = IN = to 3, CONTROL = to, I LOAD = Minimum Load Current (Note 3) IN =, CONTROL = IN = 3, CONTROL = CONTROL Dropout oltage (Note ) IN =, I LOAD =.A IN =, I LOAD = A IN =, I LOAD =.8A IN Dropout oltage (Note ) CONTROL =, I LOAD =.A CONTROL =, I LOAD = A CONTROL =, I LOAD =.8A CONTROL Pin Current (Note ) IN =, CONTROL =, I LOAD =.A IN =, CONTROL =, I LOAD = A IN =, CONTROL =, I LOAD =.8A Current Limit IN =, CONTROL =, SET =, OUT =. Error Amplifier RMS Output Noise (Note 7) Reference Current RMS Output Noise (Note 7) UNITS na/ na/ m/ m/ m m m.8.8 A I LOAD =, Hz f khz, TYP = µ RMS C OUT = µf, C SET =.µf Hz f khz TYP = na RMS rh383mkfa 3

4 RH383MK DICE/DWF Table 3. Electrical Characteristics (Postirradiation) (Notes, 9, ) PARAMETER CONDITIONS KRads(Si) KRads(Si) KRads(Si) KRads(Si) KRads(Si) MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX UNITS SET Pin Current (Note 6) IN =, CONTROL =, I LOAD = µa Output Offset oltage IN =, CONTROL =, I LOAD = m ( OUT SET ) Load Regulation, I SET I LOAD = to.8a na Load Regulation, OS I LOAD = to.8a m Line Regulation, I SET IN = to 3, CONTROL = to, I LOAD = na/ Line Regulation, OS IN = to 3, CONTROL = to, I LOAD = m/ Minimum Load Current (Note 3) CONTROL Dropout oltage (Note ) IN Dropout oltage (Note ) CONTROL Pin Current (Note ) IN =, CONTROL = IN = 3, CONTROL = IN =, I LOAD =.A IN =, I LOAD = A IN =, I LOAD =.8 CONTROL =, I LOAD =.A CONTROL =, I LOAD = A CONTROL =, I LOAD =.8A IN =, CONTROL =, I LOAD =.A IN =, CONTROL =, I LOAD = A IN =, CONTROL =, I LOAD =.8A Current Limit IN =, CONTROL =, SET =, OUT =. Error Amplifier RMS Output Noise (Note 7) Reference Current RMS Output Noise (Note 7) m m m A I LOAD =, Hz f khz, TYP = TYP = TYP = TYP = TYP = µ RMS C OUT = µf, C SET =.µf Hz f khz TYP = TYP = TYP = TYP = TYP = na RMS Note : Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note : Unless otherwise specified, all voltages are with respect to OUT. The RH383MK DICE is tested and specified under pulse load conditions such that T J T A. Note 3: Minimum load current is equivalent to the quiescent current of the part. Since all quiescent and drive current is delivered to the output of the part, the minimum load current is the minimum current required to maintain regulation. Note : Dropout results from either of minimum control voltage, CONTROL, or minimum input voltage, IN, both specified with respect to OUT. These specifications represent the minimum input-to-output differential voltage required to maintain regulation. Note : The CONTROL pin current is the drive current required for the output transistor. This current tracks output current with roughly a :6 ratio. The minimum value is equal to the quiescent current of the device. Note 6: The SET pin is clamped to the output with diodes through k resistors. These resistors and diodes only carry current under transient overloads. Note 7: Adding a small capacitor across the reference current resistor lowers output noise. Adding this capacitor bypasses the resistor shot noise and reference current noise; output noise is then equal to error amplifier noise (see LT 383 Data Sheet and Application Note 83). Note 8: Dice are probe tested at C to the limits shown in Table. Except for high current tests, dice are tested under low current conditions which assure full load current specifications when assembled. Note 9: Dice that are not qualified by Linear Technology with a can sample are guaranteed to meet specifications of Table only. Dice qualified by Linear Technology with a can sample meet specifications in all tables. Note : This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature exceeds the maximum operating junction temperature when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note : Please refer to LT383 standard product data sheet for Typical Performance Characteristics, Pin Functions, Applications Information, and Typical Applications. rh383mkfa

5 Table. Electrical Test Requirements MIL-STD-883 TEST REQUIREMENTS SUBGROUP Final Electrical Test Requirements (Method ) *, Group A Test Requirements (Method ), Group B and D for Class S,, End Point Electrical Parameters (Method ) *PDA applies to subgroup. See PDA Test Notes. RH383MK DICE/DWF PDA Test Notes The PDA is specified as % based on failures from Group A, Subgroup, tests after cooldown as the final electrical test in accordance with method of MIL-STD-883. The verified failures of Group A, Subgroup, after burn-in divided by the total number of devices submitted for burn-in in that lot shall be used to determine the percent for the lot. Linear Technology Corporation reserves the right to test to tighter limits than those given. Total Dose Bias Circuit 3 CASE IN OUT µf 3 µf Ω CONTROL NC SET k Burn-In Circuit CASE IN OUT µf 3 µf 99Ω CONTROL NC SET k 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. rh383mkfa

6 RH383MK DICE/DWF Typical Performance Characteristics SET PIN CURRENT (µa) SET Pin Current G OFFSET OLTAGE (m) Offset oltage. I L = G MINIMUM LOAD CURRENT () Minimum Load Current IN OUT = 3, CONTROL OUT =. IN OUT =, CONTROL OUT = G3 MINIMUM OLTAGE ( IN - OUT ) (m) 3 Dropout oltage (Minimum IN oltage) I LOAD =.8A I LOAD = A 383 G MINIMUM CONTROL PIN OLTAGE (CONTROL- OUT ) () Dropout oltage (Minimum CONTROL Pin oltage) I LOAD =.8A 383 G CURRENT LIMIT (A) Current Limit IN = CONTROL = OUT = 383 G6 Revision History RE DATE DESCRIPTION PAGE NUMBER A / I L Min = ; CONTROL = to ; Line Reg I SET and Line Reg, OS update, added Note, 6 Linear Technology Corporation 63 McCarthy Blvd., Milpitas, CA 9-77 (8) 3-9 FAX: (8) 3-7 ID rh383mkfa LT RE A PRINTED IN USA LINEAR TECHNOLOGY CORPORATION

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