ISL85033-12VEVAL3Z INTERSIL | Alldatasheet

Document overview

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Technical content

  • Wide Input Voltage Range from 4.5V to (28V - V OUT)
  • Adjustable and Synchronizable Negative Output Voltage with Continuous Output Current up to 5A, depending on VOUT and VIN
  • Current Mode Control
  • Adjustable Switching Frequency from 300kHz to 2MHz
  • Power-Good Detection (referenced to V OUT)
  • Externally Adjustable Soft-start Time
  • Overcurrent and Hiccup Mode Short Circuit Protection, Thermal Overload Protection, UVLO
  • Boot Undervoltage Detection
  • Default Out-of-phase Channels Reduce Voltage Ripple and Component Size. User-selectable Phase Operation. Recommended Equipment The following materials are recommended to perform testing:
  • 0V to 30V power supply with at least 7A source current capability or a 5V battery
  • Electronic loads capable of sinking current up to 7A
  • Digital multimeters (DMMs)
  • 100MHz quad-trace oscilloscope
  • Signal generator Quick Setup Guide 1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power. 2. Connect the bias supply to VIN1, the plus terminal to VIN1, and the negative return to GND1. 3. Verify that the position is ON for S1. 4. Turn on the power supply. 5. Verify the output voltage is -12V for V OUT. Evaluating the Other Output Voltages The ISL85033-12VEVAL3Z kit output is preset to -12V; however, output voltages can be adjusted from -3.3V to -15V. The output voltage programming resistor, R3, depends on the desired output voltage of the regulator. The value for the feedback resistor is typically between 0Ω and 142kΩ as shown in Equation 1. Table 1 summarizes the external component selection for VOUT = -5V, VOUT = -12V, and VOUT = -15V. The curves in Figure 1 indicate the maximum output current the converter can deliver as a function of the input voltage and the selected output voltage configuration. Figures 2, 3 and 4 show the efficiency for different VIN, VOUT and load combinations.

TABLE 1. COMPONENT SELECTION FOR V OUT CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. Copyright Intersil Americas Inc. 2011. All Rights Reserved. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners.

3 AN1636.1 July 27, 2011 ISL85033-12VEVAL3Z Schematic VNEG -12V B340BB340B 10UH (ADJUSTABLE) -12V VNEG 10UH ON OFF OPEN 113K SS1 PGOOD2 VNEG 8.06K C13 ISL85033IRTZ 68UF 0.01UF BOOT2 COMP2 VIN FB2 FS VIN 10UF TBD PGOOD1 4700PF VNEG VNEG VCC DNP 100UF VCC 4.7UF VNEG DNP 0.01UF OPEN COMP1 VCC SS2 VNEG FS VNEG SYNCIN PGOOD2 DNP SYNCIN OPEN NC1 DNP SS2 COMP2 VNEG EN OPEN FB2 OPEN SS1 VCC OPEN 100K FB1 120K VNEG DNP VNEG VNEG DNP 5600PF EN VNEG SS1 COMP1 OPENOPENVNEGOPEN OPEN PGOOD1 DNP 22UF 10UF 68UF SS1 BOOT1 VNEG 22PF SS2 VNEG 22UF FB1 EN 10UF TBD VNEG VNEG 5600PF VNEG 22 0 JVO2 VNEG1 VNEG2 VIN GND1 JLX22 GNDO2 VNEG SS2 PG1 FS SI SO PG2 EN C11 JLX1 2 GNDO1 R18 R8R7 R11 C10 C6 C8 R19 R20 C14 C17 S12 R17 R10 R25 R24 R23 C9C5 C15 R15 C16 R16 R3 R14 R13 R12 C18 C12 C1912 C20C1 EP SS1 PGND1 PHASE1 PGOOD1 NC FS SYNCIN SGND SYNCOUT PGOOD2COMP2 FB2 SS2 PGND2 BOOT2 PHASE2 PHASE2VIN2 VIN2 EN2 VCC EN1 VIN1 VIN1 PHASE1 FB1 BOOT1 COMP1 A A A A A A A A A A AA

4 AN1636.1 July 27, 2011 Bill of Materials PART NUMBER REFERENCE DESIGNATOR QUANTITY VALUE TOLERANCE VOLTAGE POWER PACKAGE TYPE JEDEC TYPE MANUFACTURER DESCRIPTION 131-4353-00 JLX1, JLX2, JVO2

3 CONN TEK131-

TEKTRONIX Scope Probe Test Point PCB Mount TPSD686K020R00 070-T C12, C19 2 68µF 20% 20V SMD CAP_TANT AVX TQC Series Hi-Volt Low ESR Capacitor B340B D1, D2 2 SMD2 DO_SMA DIODES 3A Low VF SCHOTTKY BARRIER RECTIFIER C5750X7R1E226M C14, C17 2 22µF 20% 25V 2220 CAP_2220 TDK Ceramic Cap EEE-FK1V101P-T C2 1 100µF 20% 35V SMD CAPAE_315X 402 PANASONIC AL LYTIC FK SERIES CAP (RoHS COMP.) GMK325BJ106KN C6, C8 2 10µF 10% 35V 1210 CAP_1210 TAIYO YUDEN Ceramic Chip Cap GT13MCBE S1 1 SW SW_GT13MC BE C&K SPDT On-Off-On Ultraminiature Toggle Switch H1044-00220- 50V5 C13 1 22PF 5% 50V 402 CAP_0402 GENERIC Multilayer Cap H1044-00472- 50V10 C4 1 4700PF 10% 50V 402 CAP_0402 GENERIC Multilayer Cap H1044-OPEN C10, C15, C16 3 OPEN OPEN OPEN 402 CAP_0402 GENERIC Multilayer Cap H1045-00103- 50V10 C5, C9 2 0.01µF 10% 50V 603 CAP_0603 GENERIC Multilayer Cap H1045-00562- 50V10 C3, C11 2 5600PF 10% 50V 603 CAP_0603 GENERIC Multilayer Cap H1046-00475- 10V20 C7 1 4.7µF 20% 10V 805 CAP_0805 GENERIC Multilayer Cap H1065-00106- 25V10-T C18 1 10µF 10% 25V SMD CAP_1206 VENKEL Multilayer Cap H1082-TBD-TBD C1, C20 2 TBD TBD TBD 1210 C AP_1210 GENERIC Ceramic Chip Cap H2505-01003-1/ 16WR1 R4 1 100k 0.10% 1/16W 603 RES_0603 GENERIC Metal Film Chip Resistor H2505-DNP-DNP-1 R10, R17 2 DNP 1% DNP 603 RES_0603 GENERIC Metal Film Chip Resistor (Do Not Populate) H2505-DNP-DNP- R12, R13, R19, R20, R25 5 DNP 0.10% DNP 603 RES_0603 GENERIC Metal Film Chip Resistor (Do Not Populate) H2510-01133- 1/16W1 R3 1 113k 1% 1/16W 402 RES_0402 GENERIC Thick Film Chip Resistor H2510-01203- 1/16W1 R5 1 120k 1% 1/16W 402 RES_0402 GENERIC Thick Film Chip Resistor H2510-08061- 1/16W1 R2 1 8.06k 1% 1/16W 402 RES_0402 GENERIC Thick Film Chip Resistor H2510-ROPEN- OPEN R7, R8, R11, R14-R16

6 OPEN 1% OPEN 402 RES_0402 GENERIC Thick Film Chip Resistor

R23, R24 2 0 0% 1/16W 603 RES_0603 GENERIC Thick Film Chip Resistor H2511-00R00- 1/16W1 R9, R18 2 0 1% 1/16W 603 RES_0603 GENERIC Thick Film Chip Resistor ISL85033IRTZ U1 1 QFN QFN28_157X 157_157_EP INTERSIL WIDE VIN DUAL STANDARD BUCK REGULATOR (Pb-FREE) PAD_100 EN, FS, SI, SO, PG1, PG2, SS1, SS2, VNEG 9 THOLE PAD-100 GENERIC 0.100 Pad with 0.037 Plated Thru Hole

cautioned to verify that the Application Note or Technical Brief is current before proceeding. FIGURE 9. BOTTOM LAYER ETCH FIGURE 10. BOTTOM LAYER COMPONENTS