ISL8104 Intersil Corporation, ISL8104 Datasheet
ISL8104
Available stocks
Related parts for ISL8104
ISL8104 Summary of contents
Page 1
... Synchronous Buck Pulse-Width Modulator (PWM) Controller The ISL8104 is a high performance synchronous controller for demanding DC/DC converter applications. It provides overcurrent fault protection and is designed to safely start-up into prebiased output loads. The output voltage of the converter can be precisely regulated to as low as 0.597V, with a maximum tolerance of ± ...
Page 2
Block Diagram 6µA REFERENCE V = 0.597 V REF REFIN (QFN ONLY) FB COMP GND SS EN POWER-ON 30µA RESET (POR) SOFT-START AND FAULT LOGIC EA OSCILLATOR RT SSDONE (QFN ONLY) VCC INTERNAL REGULATOR 200µA SOURCE OCP GATE CONTROL LOGIC ...
Page 3
... ONLY ISL8104 ISL8104 BOOT F2 PVCC VCC BOOT R OCSET OCSET C OCSET UGATE PHASE LGATE PGND ISL8104 COMP GND R +1.2V to +14V OCSET OUT C OUT HFIN C BIN Q1 C BOOT L OUT HFOUT ...
Page 4
... V BOOT PHASE Ambient Temperature Range, ISL8104C . . . . . . . . . . . . 0°C to 70°C Ambient Temperature Range, ISL8104I .-40°C to 85°C CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. ...
Page 5
... Load - GBD L_SINK PVCC R 90mA Source Current L_SINK I = 2mA SSDONE 1000 FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY Alternately ISL8104’s switching frequency can be lowered from 200kHz to 50kHz by connecting the RT pin with a resistor to VCC according to the following equation GND) RT MIN TYP 0.591 ...
Page 6
... During soft-start, an internal 30µA current source charges the external capacitor ( the SS pin up to ~4V. If the SS ISL8104 is utilizing the internal reference, then as the SS pin’s voltage ramps from 1V to 3V, the soft-start function scales the reference input (positive terminal of error amp) from GND to VREF (0.597V nominal). If the ISL8104 is utilizing an ...
Page 7
... Once the voltage on the SS pin has reached approximately 0V, the normal soft-start sequence is initiated. If the fault is still present on the subsequent restart, the ISL8104 will repeat this process in a hiccup mode. Figure 4 shows a typical reaction to a repeated overcurrent condition that places the regulator in a hiccup mode. If the regulator is ...
Page 8
... See the ISL6612 datasheet for specification parameters that are not defined in the current ISL8104 electrical specifications table. Reference Input The REFIN pin allows the user to bypass the internal 0.597V reference with an external reference. If REFIN is NOT above ~2 ...
Page 9
... Locate the ISL8104 within inches of the MOSFETs, Q1 and Q2 (1 inch or less for 500kHz or higher operation). The circuit traces for the MOSFETs’ gate and source connections from the ISL8104 must be sized to handle peak current. Minimize any leakage current paths on the SS pin ...
Page 10
... Using the above guidelines should yield a compensation gain similar to the curve plotted. The open loop error amplifier gain bounds the compensation gain. Check the 10 ISL8104 , compensation gain amplifier. The closed loop gain, G ...
Page 11
... Given a sufficiently fast control loop design, the ISL8104 will provide either 0% or 100% duty cycle in response to a load transient. The response time is the time required to slew the inductor current from an initial current value to the transient current level ...
Page 12
... MOSFET power, package type, ambient temperature and air flow. Standard-gate MOSFETs are normally recommended for use with the ISL8104. However, logic-level gate MOSFETs can be used under special circumstances. The input voltage, upper gate drive level, and the MOSFETs absolute gate-to- source voltage rating determine whether logic-level MOSFETs are appropriate ...
Page 13
... The lead width “B”, as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact. 13 ISL8104 M14.15 (JEDEC MS-012-AB ISSUE C) 14 LEAD NARROW BODY SMALL OUTLINE PLASTIC M B ...
Page 14
... 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 14 ISL8104 L16.4x4 16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220-VGGC ISSUE C) ...