DEMO MANUAL DC1886B. LTC4232 and LTC4232-1: 5A Integrated Hot Swap Controller DESCRIPTION PERFORMANCE SUMMARY

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1 DEMO MNUL DC886B DESCRIPTION Demonstration circuit 886B features the LTC and the LTC- integrated Hot Swap controllers. The LTC is ideally suited for demanding power distribution control in.9v to V applications for hot board insertion protection, high side power switching, and electronic circuit breaker functions. The LTC provides a rich set of features to support Hot Swap applications including: % accurate undervoltage and overvoltage comparators Thermal protection djustable inrush current control djustable, 0% accurate current limit with programmable cutout time Foldback current limiting Programmable output voltage ramp rate Configurable auto-retry or latchoff on overcurrent faults Power good and fault outputs Debounce time during supply turn-on LTC and LTC-: Integrated Hot Swap Controller The LTC debounce time is 00, while the LTC- is 6. Both are available in a 6-lead mm mm DFN package. The LTC is showcased on demonstration circuit 886B-. The LTC- is installed on DC886B-B. Both demo boards are configured for V application. By changing a few passive components,.9v to V applications can be easily evaluated. The LTC has limited output voltage slew rate with a typical value of 00V/s, while the LTC- does not have a special circuit to limit this parameter. The natural (maximum) gate voltage slew rate (S N ) of the LTC- is defined by the internal MOSFET C RSS (reverse transfer capacitance) value and gate driver current capability. It is 8000V/s as a typical value. Design files for this circuit board are available at L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. ll other trademarks are the property of their respective owners. PERFORMNCE SUMMRY (T = C) SYMBOL PRMETER CONDITIONS MIN TYP MX UNITS V DD Board Input Supply Range Min Is UV, Max Is OV 9.. V dv GTE /dt GTE Pin Turn-On Ramp Rate LTC LTC- with 0nF GTE Capacitor R ON MOSFET + Sense Resistor On-Resistance 0 mω I LIM(TH) Current Limit Threshold V FB =.V, No R SET V FB = 0V V FB =.V, R SET = 0k V TH OV, UV, FB Pin Threshold Voltage V IN Rising...6 V V UV(RTH) UV Pin Reset Threshold Voltage V UV Falling V V FB(HYST) FB Pin Power Good Hysteresis mv t D(UTO-RETRY) uto-retry Turn-On Delay (Internal) LTC LTC- T DJUST Timer Period for DJUSTBLE Option LTC LTC V/ V/ dc886bfa

2 DEMO MNUL DC886B JUMPERS ND LEDS Two demo board jumpers, JP and JP, allow selection of controller operation: JP TIMER DURTION: Set to FIXED position for the internal timer period (FIXED not recommended for LTC- during auto-retry) or DJUST- BLE determined by TIMER capacitor C ( for LTC and. for LTC-). (Default position: DJUSTBLE) JP UTORETRY: Set to ON for auto-retry or OFF for latchoff on overcurrent fault. (Default position: OFF) When selecting UTORETRY option for the circuit with a predominantly resistive load, particularly for LTC-, pay special attention to the power MOSFET thermal condition. The initial low current limit (due to the foldback characteristic) can power the load only during a very short time, and the MOSFET will experience the maximum current limit for almost all of the remaining power up period. This may exceed the MOSFET SO, if allowed to autoretry. Four LEDs indicate the state of the hot swap circuit. Red LEDs, D and D, provide fault status and low output voltage (it is a NOT power good signal). Two green LEDs, D and D, signal the presence of valid input and output voltages. Figure. Proper Measurement Equipment Setup dc886bfa

3 DEMO MNUL DC886B QUICK STRT PROCEDURE Demonstration circuit 886B is easy to set up to evaluate the performance of the LTC or LTC-. Refer to Figure for the proper measurement equipment setup and follow the procedure below.. Place jumpers in the following positions: JP TIMER DURTION FIXED JP UTORETRY OFF. With power off, connect V power supply terminals to the VDD (E) and GND (E) turrets.. Turn on the V power supply and verify the output voltage between the V OUT (E) and GND (E) turrets. Two green LEDs, D and D should light up.. Check the current limit using an electronic or resistive load. It should be in the range of to 6. if an overcurrent condition occurs while the output is high (after powering up properly). If the output is shorted initially, the load current will be limited in the range of. to.8 due to the foldback characteristic. Current may be monitored on the IMON turret. The IMON signal scale is 0.V/. n overcurrent condition is indicated by the red LED FLT(D) and red LED PG (D).. Check the output voltage slew rate with an oscilloscope, without a load connected. It should take from to 80 for LTC, and from.0 to 7.0 for LTC-. 6. For DC886B- (LTC) use a 000μF capacitive load to demonstrate that power up mode completes successfully. Use a current probe to verify that inrush current is limited initially by the foldback characteristic and later by the low output voltage slew rate. 7. For DC886B- use a 6000μF capacitive load to demonstrate that the part not only enters into the current limit state but operates in this state until the timer period expires. It is not a successful power up. 8. For DC8886B-B use a 800μF capacitive load to demonstrate a successful power up mode. The controller will operate in current limit almost all of the timer period. 9. For DC886B-B use a 000μF capacitive load to demonstrate an unsuccessful power up transient. The operating point does not leave current limit during the whole timer period. It will then time out and turn off. dc886bfa

4 DEMO MNUL DC886B PRTS LIST ITEM QTY REFERENCE PRT DESCRIPTION MNUFCTURER/PRT NUMBER Required Circuit Components 0 CIN, COUT CP., SNYO\6X\H COUT CP., TNT, µf V, 0%, 7 VX, TPSD6M0R000 C CP., XR, µf V, 060 VX, 060D0KT D DIODE, 00W TRNSIENT VOLTGE DIODES INC., SMJ--F SUPPRESSOR, SM-DIODE D, D LED, GREEN, LED-ROHM-SML-00FT ROHM, SML-00FTT86L 6 D, D LED, RED, LED-ROHM-SML-00VT ROHM, SML-00VTT86L 7 E, E, E, E TURRET, TEST PIN, 0.09" MILL-MX, E-E TURRET, TEST PIN, 0.06" MILL-MX, JP, JP JMP, HDX, 0.079CC SULLIN, NRPN0PEN-RC 0 RMON RES., CHIP, 0k, /8W, %, 080 YGEO, RC080JR-070KL 0 RSET RES., CHIP, 080 R, R, R, R RES., CHIP,.k, /6W, %, 060 YGEO, RC060JR-07KL R RES., CHIP, 0k, /6W, %, 060 YGEO, RC060JR-070KL R6, R7, R8 RES., CHIP, 0k, /6W, %, 060 YGEO, RC060JR-070KL R9 RES., CHIP, 0k, /6W, %, 060 YGEO, RC060JR-070KL 6 R0 RES., CHIP, 6k, /6W, %, 060 YGEO, RC060JR-076KL 7 SHUNT, 0.079" CENTER SMTEC, SN-BK-G DC886B- Required Circuit Components DC886B-GENERL BOM C CP., XR, µf V, 060 VX, 060D0KT 0 CGS, CGTE CP., RGTE RES., 060 U I.C., LTCIDHC, DFN6DHC LINER TECH., LTCIDHC DC886B-B Required Circuit Components DC886B-GENERL BOM C CP., XR, 0.µF V, 060 VX, 060D0KT 0 CGS CP., X7R, 00pF 00V, %, 060 VX, 060CJT CGTE CP., X7R, 0.0µF 00V, %, 060 VX, 060C0JT RGTE RES., CHIP, 00k, /0W, % 060 NIC, NRC06F00TRF U I.C., LTCIDHC-, DFN6DHC LINER TECH., LTCIDHC- dc886bfa

5 DEMO MNUL DC886B SCHEMTIC DIGRM VDD V VDD D D R.k R7 R8 0k 0k C C TIMER DURTION FIXED DJUSTBLE UTORETRY OFF ON ECO REV D D D SMJ GREEN RED E 6 VDD OUT 9 GND R0 VDD OUT 8 R9 R R 6k OUT 7 CGS R 0k 0k.k.k E R6 UV UV FB 0k E6 OV OV GTE 0 D D CGTE RGTE RED GREEN _ RSET 080 REVISION HISTORY DESCRIPTION PPROVED DTE REBUILD WITH CHNGE VLDIMIR O VOUT FLT E7 JP + CIN C uf V U FLT TIMER INTVCC PG ISET IMON + COUT E0 ISET 7 6 SENSE GND JP R.k INTVCC E TIMER E9 E C RMON 0k 080 COUT + uf V 7 E E E8 E PG VOUT V / GND IMON B B SSY U LTCIDHC LTCIDHC - SUFFIX C uf 0.uF CGS 0.0uF CGTE 0.0uF RGTE B 00k NOTES: UNLESS OTHERWISE SPECIFIED LINER TECHNOLOGY HS MDE BEST EFFORT TO DESIGN CIRCUIT THT MEETS CUSTOMER-SUPPLIED SPECIFICTIONS; TECHNOLOGY Fax: (08)-007 HOWEVER, IT REMINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. KIM T. LTC Confidential-For Customer Use Only. LL RESISTORS RE IN OHMS, 00. VERIFY PROPER ND RELIBLE OPERTION IN THE CTUL PPLICTION. COMPONENT SUBSTITUTION ND PRINTED PP ENG. VLDIMIR O. TITLE: SCHEMTIC LL CPCITORS RE IN MICROFRDS, 060. CIRCUIT BORD LYOUT MY SIGNIFICNTLY FFECT CIRCUIT PERFORMNCE OR RELIBILITY. CONTCT LINER INTEGRTED HOT SWP CONTROLLER TECHNOLOGY PPLICTIONS ENGINEERING FOR SSISTNCE.. INSTLL SHUNTS S SHOWN. CUSTOMER NOTICE PPROVLS THIS CIRCUIT IS PROPRIETRY TO LINER TECHNOLOGY ND SUPPLIED FOR USE WITH LINER TECHNOLOGY PRTS. SCLE = NONE SIZE DTE: 60 McCarthy Blvd. Milpitas, C 90 Phone: (08)-900 LTCIDHC / - N/ DEMO CIRCUIT 886B IC NO. REV. 06/06/0, 0:0 PM SHEET OF 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. dc886bfa

6 DEMO MNUL DC886B DEMONSTRTION BORD IMPORTNT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following S IS conditions: This demonstration board (DEMO BORD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVLUTION PURPOSES ONLY and is not provided by LTC for commercial use. s such, the DEMO BORD herein may not be complete in ter of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. s a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BORD manual the kit may be returned within 0 days from the date of delivery for a full refund. THE FOREGOING WRRNTY IS THE EXCLUSIVE WRRNTY MDE BY THE SELLER TO BUYER ND IS IN LIEU OF LL OTHER WRRNTIES, EXPRESSED, IMPLIED, OR STTUTORY, INCLUDING NY WRRNTY OF MERCHNTBILITY OR FITNESS FOR NY PRTICULR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PRTY SHLL BE LIBLE TO THE OTHER FOR NY INDIRECT, SPECIL, INCIDENTL, OR CONSEQUENTIL DMGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all clai arising from the handling or use of the goods. Due to the open construction of the product, it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. lso be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BORD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing ddress: Linear Technology 60 McCarthy Blvd. Milpitas, C 90 Copyright 00, Linear Technology Corporation 6 dc886bfa LT 08 REV PRINTED IN US Linear Technology Corporation 60 McCarthy Blvd., Milpitas, C (08) -900 FX: (08) LINER TECHNOLOGY CORPORTION 0