isl6236 Intersil Corporation, isl6236 Datasheet
isl6236
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isl6236 Summary of contents
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... ISL6236IRZA ISL6236 IRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B ISL6236IRZA-T ISL6236 IRZ -40 to +100 32 Ld 5x5 QFN NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations ...
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... Pinout EN LDO LDOREFIN 2 ISL6236 ISL6236 (32 LD 5x5 QFN) TOP VIEW REF 1 TON 2 VCC 3 4 VREF3 5 VIN 6 LDO BOOT2 LGATE2 23 22 PGND GND 21 SECFB 20 PVCC 19 LGATE1 18 BOOT1 FN6373.3 June 28, 2007 ...
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... REFIN2) DC Load Regulation Line Regulation Current-Limit Current Source ILIM Adjustment Range Current-Limit Threshold (Positive, Default) 3 ISL6236 Thermal Information Thermal Resistance (Typical QFN (Notes Operating Temperature Range . . . . . . . . . . . . . . . .-40°C to +100°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Pb-free reflow profile ...
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... LDO Output in Adjustable Mode LDO Output Accuracy in Adjustable Mode LDOREFIN Input Range LDO Output Current LDO Output Current During Switchover LDO Output Current During Switchover to 3.3V 4 ISL6236 , and REF, V REF3 IN = -40°C to +100°C, unless otherwise noted. Typical values are CONDITIONS GND - PHASE ...
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... Thermal-Shutdown Threshold Out-Of-Bound Threshold Output Undervoltage Shutdown Threshold Output Undervoltage Shutdown Blanking Time INPUTS AND OUTPUTS FB1 Input Voltage 5 ISL6236 , and REF, V REF3 IN = -40°C to +100°C, unless otherwise noted. Typical values are CONDITIONS LDO = GND, BYP = GND Rising edge of PVCC ...
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... UGATE Gate-Driver Sink/Source Current LGATE Gate-Driver Source Current LGATE Gate-Driver Sink Current UGATE Gate-Driver On-Resistance LGATE Gate-Driver On-Resistance Dead Time OUT1, OUT2 Discharge On Resistance 6 ISL6236 , and REF, V REF3 IN = -40°C to +100°C, unless otherwise noted. Typical values are CONDITIONS OUT2 Dynamic Range, V ...
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... GND to detect the output. If SECFB drops below the threshold voltage, LGATE1 turns on for 300ns. This will refresh the external charge pump driven by LGATE1 without over-discharging the output voltage. GND Analog Ground for both SMPS and LDO. Connect externally to the underside of the exposed pad ISL6236 FUNCTION FN6373.3 June 28, 2007 ...
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... OUTPUT LOAD (A) FIGURE 1.05V EFFICIENCY vs LOAD (300kHz) OUT2 8 ISL6236 FUNCTION Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC BYP unless otherwise noted. Typical values are at T ULTRA SKIP MODE IN ...
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... OUTPUT LOAD (A) FIGURE 3.3V REGULATION vs LOAD (500kHz) OUT2 9 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC BYP unless otherwise noted. Typical values are at T ULTRA SKIP MODE IN SKIP MODE ...
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... INPUT VOLTAGE (V) FIGURE 13 1.05V OUTPUT VOLTAGE REGULATION OUT2 vs V (PWM MODE ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC BYP unless otherwise noted. Typical values are at T ULTRA SKIP MODE IN SKIP MODE ...
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... INPUT VOLTAGE (V) FIGURE 19 OUTPUT VOLTAGE REGULATION vs OUT1 V (PWM MODE ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC BYP unless otherwise noted. Typical values are at T 1.530 1.525 1.520 MID LOAD PWM 1 ...
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... ULTRA-SKIP 100 SKIP 0 0.001 0.010 0.100 OUTPUT LOAD (A) FIGURE 25 3.3V FREQUENCY vs LOAD OUT2 12 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC 5V, PVCC = 5V BYP unless otherwise noted. Typical values are ...
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... OUTPUT LOAD (mA) FIGURE 29. LDO OUTPUT 5V vs LOAD 3.5 3.0 2.5 2.0 1.5 1.0 0 OUTPUT LOAD (mA) FIGURE 31 LOAD REF3 13 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC BYP unless otherwise noted. Typical values are at T SKIP 1.000 10.000 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.00 ...
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... FIGURE 35. STANDBY INPUT CURRENT vs V (EN = EN2 = 0, EN LDO = VCC) V 500mV/DIV REF3 LDO 1V/DIV FIGURE 37. REF, VREF3, LDO = 5V, CP, NO LOAD 14 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC BYP unless otherwise noted. Typical values are at T 1400 ...
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... OUT2 IL2 5A/DIV POK2 2V/DIV FIGURE 43. START- 3.3V (FULL LOAD, OUT1 PWM MODE) 15 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC 5V, PVCC = 5V BYP unless otherwise noted. Typical values are at T IL1 5A/DIV POK1 2V/DIV FIGURE 40 ...
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... LGATE1 5V/DIV V RIPPLE 20mV/DIV OUT1 IL2 5A/DIV V RIPPLE 50mV/DIV OUT2 FIGURE 49. LOAD TRANSIENT V OUT1 16 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC BYP unless otherwise noted. Typical values are at T VOUT1 2V/DIV V OUT2 V ...
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... OUT1 IL1 5A/DIV POK1 2V/DIV FIGURE 55. START- 1.5V (FULL LOAD, OUT1 PWM MODE) 17 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC BYP unless otherwise noted. Typical values are at T RIPPLE 20mV/DIV IL1 2A/DIV POK1 2V/DIV FIGURE 54 ...
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... V 2V/DIV OUT1 POK1 OR POK2 5V/DIV FIGURE 61. SHUTDOWN (V = 1.5V, V OUT1 EN2 = REF) 18 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2 12V, EN2 = EN1 = VCC 5V, PVCC = 5V BYP unless otherwise noted. Typical values are at T POK2 2V/DIV FIGURE 58. START-UP V ...
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... The ISL6236 dual-buck, BiCMOS, switch-mode power- supply controller generates logic supply voltages for notebook computers. The ISL6236 is designed primarily for battery-powered applications where high efficiency and low- quiescent supply current are critical. The ISL6236 provides a 19 ISL6236 Circuit of Figure , Figure , and Figure , no load on LDO, OUT1, OUT2, V ...
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... In addition, SMPS2 can also use REFIN2 to track its output from 0.5V to 2.50V. The ISL6236 contains fault- protection circuits that monitor the main PWM outputs for undervoltage and overvoltage conditions. A power-on sequence block controls the power-up timing of the main PWMs and monitors the outputs for undervoltage faults. The ISL6236 includes an adjustable low drop-out linear regulator ...
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... VCC R1 7.87kΩ 5V FB1 TIED TO GND = 5V FB1 TIED TO VCC = 1. 200kΩ 10kΩ GND VCC VCC FIGURE 66. ISL6236 TYPICAL DYNAMIC GFX APPLICATION CIRCUIT 21 ISL6236 5V C5 1µF PVCC VCC LDO VIN LDOREFIN BOOT1 BOOT2 UGATE2 UGATE1 PHASE2 PHASE1 ...
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... FB1 TIED TO GND = 5V FB1 TIED TO VCC = 1.5V R3 200kΩ OFF OFF OFF VCC VCC FREQUENCY-DEPENDENT COMPONENTS 1.5V/1.05V SMPS C11 FIGURE 67. ISL6236 TYPICAL SYSTEM REGULATOR APPLICATION CIRCUIT WITHOUT CHARGE PUMP 22 ISL6236 5V C5 1µF PVCC VCC LDO VCC VIN LDOREFIN BOOT1 BOOT2 UGATE2 UGATE1 C4 0.22µ ...
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... R1 200kΩ R2 39.2kΩ FREQUENCY-DEPENDENT COMPONENTS 5V/3.3V SMPS SWITCHING FREQUENCY L1 6.8µH L2 7.6µH C2 2x470µF C11 330µF FIGURE 68. ISL6236 TYPICAL SYSTEM REGULATOR APPLICATION CIRCUIT WITH 14V CHARGE PUMP 23 ISL6236 C5 1µF VCC PVCC LDO VIN LDOREFIN BOOT1 BOOT2 UGATE2 UGATE1 PHASE2 PHASE1 LGATE2 ...
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... ISL6236 TON SKIP# SMPS1 SMPS2 SYNCHRONOUS PWM BUCK CONTROLLER EN1 EN2 POK1 POK2 VREF3 THERMAL THERMAL SHUTDOWN SHUTDOWN FIGURE 69. DETAILED FUNCTIONAL DIAGRAM ISL6236 BOOT2 UGATE2 PHASE2 PVCC LGATE2 PGND ILIM2 REFIN2 OUT2 OUT2 POK2 POK1 VCC INTERNAL LOGIC 10Ω PVCC VREF3 ...
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... The load-current level at which ON PFM/PWM crossover occurs, I LOAD(SKIP) the peak-to-peak ripple current, which is a function of the inductor value (Figure 71). For example, in the ISL6236 typical application circuit with V OUT1 L = 7.6µH, and K = 5µs, switchover to pulse-skipping operation occurs 0.96A or about on-fifth full load. ...
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... When the on-time has expired, the controller re-enables the 26 ISL6236 low-side MOSFET until the controller detects that the inductor current dropped below the zero-crossing threshold. Starting with a LGATE pulse greatly reduces the peak output voltage when compared to starting with a UGATE pulse, as long as VFB < ...
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... ILIM is adjusted. The current-limit threshold is adjusted with an external resistor for ISL6236 at ILIM. The current-limit threshold adjustment range is from 20mV to 200mV. In the adjustable mode, the current-limit threshold voltage is 1/10th the voltage at ILIM. The voltage at ILIM pin is the product of 5µ ...
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... OUT OUT able to turn on UGATE when the output voltage falls to the reference. To prevent this, the ISL6236 monitors the BOOT capacitor voltage, and if it falls below 3V, it initiates an LGATE pulse, which will refresh the BOOT voltage. POR, UVLO, and Internal Digital Soft-Start ...
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... Shutdown Mode The ISL6236 SMPS1, SMPS2 and LDO have independent enabling control. Drive EN1, EN2 and EN LDO below the precise input falling-edge trip level to place the ISL6236 in its low-power shutdown state. The ISL6236 consumes only 20µA of quiescent current while in shutdown. When shutdown mode activates, the 3.3V VREF3 remain on. Both SMPS outputs are discharged to 0V through a 25Ω ...
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... High “>2.5” → High REF 30 ISL6236 TABLE 3. OPERATING-MODE TRUTH TABLE (Continued) Discharge switch (25Ω) connects OUT to GND. One output may still run while the other is in discharge mode. Activates when PVCC is in UVLO, or transition to UVLO, standby, or shutdown has begun. LDO, VREF3 and REF active. ...
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... Inductor values lower than this grant no further size-reduction benefit. The ISL6236 pulse-skipping algorithm (SKIP# = GND) initiates skip mode at the critical conduction point, so the inductor's operating point also determines the load current at which PWM/PFM switchover occurs ...
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... Examining the 5A circuit example with a maximum r = 5mΩ at room temperature. At +125°C reveals the DS(ON) following: 32 ISL6236 I LIMIT LOW (EQ. 8) 4.17A 4.12A 4.17A is greater than the valley current of 4.12A, so the = 5V, circuit can easily deliver the full-rated 5A using the 30mV OUT2 nominal current-limit threshold voltage ...
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... The input capacitors must meet the input-ripple-current (I ) requirement imposed by the switching current. The RMS ISL6236 dual switching regulator operates at different frequencies. This interleaves the current pulses drawn by the two switches and reduces the overlap time where they add together. The input RMS current is much smaller in comparison than with both SMPSs operating in phase ...
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... This is especially true when multiple converters are on the same PC board where one circuit can affect the other. Refer to the ISL6236 Evaluation Kit data sheet for a specific layout example. Mount all of the power components on the top side of the board with their ground terminals flush against one another, if possible ...
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... MOSFET, input, and output capacitors) to the small island with a single short, wide connection (preferably just a via). Create PGND islands on the layer just below the top-side layer (refer to the ISL6236 EV kit for an example) to act as an EMI shield if multiple layers are available (highly recommended). Connect each of these individually to the star ground via, which connects the top side to the PGND plane ...
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... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 36 ISL6236 L32.5x5B 32 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VHHD-2 ISSUE C ...