SC1592. Low Dropout High Performance Adjustable Positive Voltage Regulator SC1592 POWER MANAGEMENT. Applications. Typical Application Circuit

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Cameron Cook
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1 Description The SC1592 is a 3A low dropout high performance linear voltage regulator, that provides a low voltage, high current output with a minimum of external components, utilizing dual supply configuration. The SC1592 offers a wide input voltage range from 1.25 to 16 and is ideal for applications that need to convert down to 0.8. Additionally, the SC1592 is fully protected with an externally programmable current limit, and thermal shutdown. Also, there is an EN input which enables or shuts down the device. SC1592 Low Dropout High Performance Adjustable Positive oltage Regulator Features Wide input range, IN = 1.25 to 16, CNTL = 3 to 16 3A Guaranteed Output Current 260m 3A dropout voltage in dual supply mode 1% Initial Accuracy Adjustable output voltage, down to 0.8 Programmable current limiting and thermal shutdown Fast transient response Excellent line and load regulation Power SO8 and 7lead DDPAK The SC1592 voltage regulator is available in 7lead DDPAK and SOIC8L EDP packages. Typical Application Circuit Applications Low voltage logic supplies Microprocessor and chipset supplies Split plane microprocessor supplies Advanced graphics cards supplies Sound cards and auxiliary power supplies SMPS post regulator +3.3 cntl C1 1uF +2.5 in C2 10uF CNTL IN EN TTL SC1592 GND SENSE ILIM R1 100 R R out REF C3 47uF(cer) R2 = (1 + ) R3 = 0.8 typ. REF Revision: November 21,

2 Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Power Input oltage Symbol Control Input oltage NTL Maximum Units IN 18 C 8 1 Output Current I 5 A Power Dissipation P D Internally Limited W Thermal Resistance Junction to Ambient DDPAK (1sq. in.) SOIC8L EDP (1sq. in.) Thermal Resistance Junction to Case DDPAK SOIC8L EDP θ JA θ JC C/W C/W Junction Temperature Range T J 40 to +125 C Storage Temperature Range Lead Temperature (Soldering) 10 Sec. T EAD ESD Rating (Human Body Model) Electrical Characteristics T STG 65 to +150 L 00 Unless specified: IN = 2.5, EN = CNTL = 3.3, = 1.8, I = 10mA, R LIM = 100Ω, T J = T A = 25 C. alues in bold indicate 40 C < T J < +125 C. C 3 C ESD 2 k Parameter Symbol Test Conditions Min Typ Max Units Control oltage NTL Reference oltage EF Control Pin Current I NTL_EN Control Pin Current in Shutdown IN Line Regulatio n CNTL Line Regulatio n 1) L oad Regulation Dropout oltage C = EF R = 92 REF C CNTL = IN = EN = I REF I C NTL O = IN UT CNTL_DIS CNTL R EG LINE ) R EG CNTL).5 (.3 ( ( R EG 0mA ( LOAD) = REF 3 16 R = 16 ; = 0 O = = 16 EN ; I = 3A O = IN = 16 = EN m ma 1 5 μa 2 IN %/ 3 CNTL 16, O UT = REF %/ 1 I 2A, T = 25 C % J 10mA I 3A, 40 < T < 125 C % J DO I = 2A; I = 0.98 nom m = 3A; = 0.98 nom Semtech Corporation 2

3 Electrical Characteristics (Cont.) Unless specified: IN = 2.5, EN = CNTL = 3.3, = 1.8, I = 10mA, R LIM = 100Ω, T J = T A = 25 C. alues in bold indicate 40 C < T J < +125 C. Parameter Symbol Test Conditions Min Typ Max Units Thermal Shutdown T HUT Thermal Shutdown Hysteresis S 50 1 C 10 C SENSE Input Current 1 μa Low Level EN 0. 8 High Level EN 2 EN Input Current EN = CNT L = μa EN Impedance 65 KΩ 2) C urrent Limit Accuracy ( I LIM 20 Notes: (1) For load regulation use a 1ms current pulse width, d.c. 10% when measuring % (2) Current limit is programmable, I LIM 240 R LIM 2011 Semtech Corporation 3

4 Pin Configurations Ordering Information Top iew Part Number 1) P ackage ( emp. Range ( T T J ) TAB (TO2637L DDPAK) Pin Function 1 ILIM 2 IN 3 CNTL 4 GND 5 6 SENSE 7 EN TAB GND SC1592IMTR (3) S C1592IMTRT SC1592ISTR (3) S C1592ISTRT 2) S C1592EB TO2637L SOIC8L EDP 40 C to +125 C ( Evaluation Board Notes: (1) Only available in tape and reel packaging. A reel contains 800 devices for TO263 package and 2500 devices for SOIC package. (2) When ordering Evaluation Board please specify package needed (TO263(DDPAK) or SOIC(EDP)). (3) Lead free product. Top iew Bottom iew GND ILIM 1 8 EN EN 8 1 ILIM IN IN SENSE SENSE 7 6 Exposed Die Pad 2 3 IN IN CNTL CNTL (SOIC8L EDP) (SOIC8L EDP) Pin Descriptions Pin # DDPAK Pin # SOIC Pin Name Pin Function 1 1 I LIM Externally programmable current limit should be set at < 5A. 2 2, 3 IN 3 4 CNTL This is the collector through this pin. input to the power device. The ouput load current is supplied This pin is the bias supply for the control circuitry. The current flow into this pin will be approximately 1% of the output current. For the device to regulate, the voltage on this pin must be at least 1.5 greater than the output voltage, but no less than CNTL_MIN. 4, TAB PAD G ND Ground. 5 5, 6 O UT This is the power output of the device. 6 7 S ENSE This is a feedback input. 7 8 EN E nable input. When high, should be less or equal to CNTL Semtech Corporation 4

5 Block Diagram Figure 1 R LIM 240 X I LIM I LIM = Selected current limit value = Regulated output voltage R LIM = Externally programmable current limit resistor. Accuracy of the current limit setting is better than ±20% over full operating temperature range. *Internal ESD structure. In cases where EN is permanently tied to IN, it s recommended that a 1020k resistor should be inserted in the link between EN and IN Semtech Corporation 5

6 Application Information The SC1592 is a 3A low dropout high performance linear voltage regulator. The SC1592 can be used for voltage applications as low as 0.8 and is ideal for down conversion utilizing dual supply configuration. This allows for extremely low dropout voltages with excellent load and line regulation. The SC1592 can be utilized in high voltage applications, with IN and CNTL up to 16, providing there is adequate thermal management. SC1592 is designed to meet stringent requirements of current generation microprocessors and other sensitive electronic devices. This is possible by employing an additional bias source, CNTL. The voltage of this supply needs to be at least 1.5 greater than the output voltage in order to achieve low dropout, typically less then 300m. Unlike most of the other high current linear regulators, the SC1592 provides a programmable current limit which can be set with a single resistor. The value of the programming resistor is: I LIM 240 R LIM where I LIM = selected current limit value = regulated output voltage R LIM = programmable current limit resistor The SC1592 has a fast transient response that allows it to handle large load changes associated with high current applications. Proper selection of the of the output capacitor and it s ESR value determines stable operation and optimizes performance. The typical application shown in Figure 2 was tested with a wide range of different capacitors. The circuit was found to be unconditionally stable with capacitor values from 47μF to 330μF and ESR ranging from 0.5mΩ to greater then 75mΩ. It s recommended to maintain 510mA through the output divider network in order to have a tight load and line regulation. Initial accuracy of the internal voltage reference REF = 0.8 ±1% over full temperature range. This commands the use of 0.5% or better accuracy resistors to build a precision power supply cntl C1 2.2uF +2.5 in C2 22uF REF 10k CNTL IN EN SC1592 GND SENSE ILIM R2 = (1 + ) REF R3 = 0.8 typ. Figure 2 R1 100 R R out C3 100uF The circuit in Figure 2 shows a typical application of 2.5 to 1.8 conversion with a 3.3 control supply and the load range of up to 3A steady state. Considering the approximate 2W power being dissipated by the pass element of the SC1592, we are still able to choose an SO8 EDP package with T JA = 36.5 C/W mount on the 1sq.in. copper pad allocated for adequate heat transfer. The ambient temperature in this case should not exceed 50 C. If this temperature range is too restrictive, then the DDPAK can be utilized, having T JA = 29 C/W mount on the same size copper pad. Input capacitor: A minimum of 10μF ceramic capacitor is recommended to be placed directly next to the in pin. This allows for the device being some distance from any bulk capacitance on the rail. Additionally, bulk capacitance may be added closely to the input supply pin of the SC1592 to ensure that in does not sag, improving load transient response. Output capacitor: A minimum bulk capacitance of 33μF, along with a 0.1μF ceramic decoupling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not cause stability issues. Although designed for use with ceramic output capacitors, the SC1592 is extremely tolerant of output capacitor ESR values and thus will also work comfortably with tantalum output capacitors Semtech Corporation 6

7 Typical Characteristics Load Transient Reponse 20m/div IN IN = 2.5 = 1.8 CNTL = 3.3 C IN = 22uF C = 100uF Iout Istep: 15mA to 3A slew rate: 2.5A/ us Time (2ms/div) 20m/div IN = 2.5 = 1.8 CNTL = 3.3 C IN = 22uF IN C = 100uF Iout Istep: 15mA to 3A slew rate: 2.5A/uS Time (200us/div) 2011 Semtech Corporation 7

8 Typical Characteristics (Cont.) 2.00 Load Regulation CNTL = 3.3 IN = 2.5 PUT OLTAGE() PUT CURRENT (A) PUT OLTAGE () CNTL = 3.3 IN = 2.5 I = 10mA Output oltage vs. Temperature TEMPERATURE ( o C) 2011 Semtech Corporation 8

9 Typical Characteristics (Cont.) PUT OLTAGE () CNTL = 3.3 IN = 2.5 = 1.8 I = 10mA EnableThreshold vs. Temperature TEMPERATURE ( o C) 2011 Semtech Corporation 9

10 Typical Characteristics (Cont.) Dropout oltage (Control Supply) DROP OLTAGE () INITIAL CNTL = 3.3 IN = 2.5 = PUT CURRENT (A) 0.50 Dropout oltage (Input Supply) DROP OLTAGE ( ) CNTL = 3.3 INITIAL IN = 2.5 = PUT CURRENT (A) 2011 Semtech Corporation 10

11 Typical Characteristics (Cont.) Contol Current vs. Tem perature (In Shutdown) CONTROL CURRENT (na) TEMPERATURE ( o C) CNTL = 3.3 IN = 2.5 EN = 0 I = 10mA 100 Control Current vs Temperature (In Regulation) CONTROL CURRENT (ma) 10 I = 3A I = 1A I = 2A CNTL = 3.3 IN = TEMPERATURE ( o C) 2011 Semtech Corporation 11

12 Typical Characteristics (Cont.) DROP OLTAGE (m) Dropout oltage vs. Temperature ( CNTL ) INITIAL CNTL = 3.3 IN = 2.5 = 1.8v I = 3A TEMPERA TURE ( o C) 500 Dropout oltage vs. Temperature ( IN ) DROP OLTAGE (m) 450 I = 3A CNTL = 3.3 I = 2A INITIAL IN = = 1.8v TEMPERA TURE ( o C) 2011 Semtech Corporation 12

13 Typical Characteristics (Cont.) 10 47uF ESR vs. Iout 1 Unstable Area ESR (Ohm) Stable Area PUT CURRENT (A) uF ESR vs. Iout 1 Unstable Area ESR (Ohm) Stable Area PUT CURRENT (A) uF ESR vs. Iout 1 Unstable Area ESR (Ohm) Stable Area PUT CURRENT (A) 2011 Semtech Corporation 13

14 Evaluation Board Schematic +3.3 cntl C1 2.2uF +2.5 in C2 22uF (cer) REF R opt 10k CNTL IN EN R2 = (1 + ) R3 = 0.8 typ. U1 SC1592 REF GND SENSE ILIM R1 100 R R out C3 100uF (cer) Evaluation Board Schematic Bill of Material Ref Qty Reference Part Number/alu e Manufacturer 1 1 C1 2.2uF, 16, Ceramic, 1206 Murata or similar 2 1 C2 22uF, 10, Ceramic, 1210 Murata or similar 3 1 C3 100uF, 6.3, Ceramic, 1812 Murata or similar 4 1 R1 100, ±5%, 0805 Any 5 1 R2 66.5, ±0.5%, 0805 Any 6 1 R3 53, ±0.5%, 0805 Any 7 1 Ropt 10K, ±10%, 0805 Any 8 1 U1 S C1592 Semtech Corp Semtech Corporation 14

15 Evaluation Board SOIC8 EDP 2011 Semtech Corporation 15

16 Evaluation Board TO2637L (DDPAK) 2011 Semtech Corporation 16

17 Outline Drawing SOIC8L EDP E/2 ccc C 2X N/2 TIPS aaa C SEATING PLANE C N A 1 2 e D DIMENSIONS MILLIMETERS DIM MIN NOM MAX A A E1 E A b c D E E 6.00 BSC e/2 e 1.27 BSC F 3.30 B H 2.41 h L D L1 (1.05) N 8 A A aaa 0.10 bbb 0.25 A1 ccc 0.20 bxn bbb C AB D h (F) EXPOSED PAD H h (H) GAUGE PLANE c SIDE IEW SEE DETAIL A 0.25 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS A AND B TO BE DETERMINED AT DATUM PLANE H. L (L1) DETAIL A 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. THE MEASUREMENT OF DIMENSION "F" DOES NOT INCLUDE EXPOSED TIE BAR. 01 Land Pattern SOIC8L EDP E D SOLDER MASK THERMAL IA Ø 0.36mm (C) F P G Y X Z DIMENSIONS DIM MILLIMETERS C (5.30) D 3.50 E 5.10 F 2.60 G 3.20 P 1.27 X 0.60 Y 2.10 Z 7.40 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSE ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 3. THERMAL IAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEICE. 4. REFERENCE IPCSM782A, SECTION 9.1, RLP NO. 300A Semtech Corporation 17

18 Outline Drawing TO2637L (DDPAK) 0 A SEATING PLANE B E E/2 L1 D H e b X N aaa B A A A1 DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX A A1 b c c1 D D E E H e.050 BSC 1.27 BSC L L N aaa c1 PLATED COPPER HEAT SPREADER D1 SIDE IEW SEE DETAIL A E1 (L1) NOTES: DETAIL 1. CONTROLLING DIMENSIONS ARE IN INCHES (ANGLES IN DEGREES). 2. DIMENSIONS "D" AND "E" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. A L c 01 Recommended Land Pattern TO2637L (DDPAK) H Z K DIMENSIONS DIM INCHES MILLIMETERS G H K P X Y Z G Y NOTES: P 1. CONTROLLING DIMENSIONS ARE IN INCHES (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. X 2011 Semtech Corporation 18

19 Semtech 2011 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specifi ed maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFESUPPORT APPLICATIONS, DEICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its offi cers, employees, subsidiaries, affi liates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA Phone: (805) FAX (805) Semtech Corporation 19

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