ISL6527 Intersil Corporation, ISL6527 Datasheet
ISL6527
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ISL6527 Summary of contents
Page 1
... Data Sheet Single Synchronous Buck Pulse-Width Modulation (PWM) Controller The ISL6527 makes simple work out of implementing a complete control and protection scheme for a DC-DC stepdown converter. Designed to drive N-Channel MOSFETs in a synchronous buck topology, the ISL6527 integrates the control, output adjustment, monitoring and protection functions into a single package ...
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... CT1 C PUMP CT2 CPGND GND V REF_IN REF 2 ISL6527 UGATE 14 BOOT 13 PHASE 12 VCC 11 10 CPGND 9 REF_IN 8 COMP VCC OCSET/SD CPVOUT ISL6527 D BOOT BOOT C BOOT UGATE PHASE LGATE COMP OFFSET 16 LEAD 5X5 (QFN) TOP VIEW CPVOUT 1 12 ...
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... CT1 N/C CT2 CPGND GND V REF_IN REF Block Diagram VCC CT1 CHARGE PUMP CT2 CPGND OCSET/SD 20µA REF_IN FB COMP 3 ISL6527 VCC OCSET/SD CPVOUT ISL6527 D BOOT BOOT C BOOT UGATE PHASE LGATE COMP OFFSET CPVOUT POWER-ON RESET (POR) + SOFTSTART ...
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... VCC This pin provides the bias supply for the ISL6527. Connect a well-decoupled 3.3V supply to this pin. COMP and FB COMP and FB are two of the three available external pins of the error amplifier. The FB pin is the inverting input of the internal error amplifier and the COMP pin is the error amplifier output ...
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... For Recommended soldering conditions see Tech Brief TB389 125 C SYMBOL TEST CONDITIONS I VCC POR Commercial Industrial ISL6527C, Commercial OSC IC = ISL6527I, Industrial IC = ISL6527AC, Commercial IC = ISL6527AI, Industrial ∆V OSC 3.3V, No Load CPVOUT VCC Guaranteed By Design GBWP SR V REF_IN Commercial 1.5V REF_IN Industrial 1.5V REF_IN I V ...
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... ISL6527 incorporates specialized circuitry which insures that the complementary MOSFETs are not ON simultaneously. The adaptive shoot-through protection utilized by the ISL6527 looks at the lower gate drive pin, LGATE, and the upper gate drive pin, UGATE, to determine whether a MOSFET OFF ...
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... T1 T2 External Reference The ISL6527 allows the designer to determine the reference voltage that is used. This allows the ISL6527 to be used in many specialized applications, such as the V voltage in a DDR Memory power supply, which must track the V DDQ this voltage does not exceed 1 ...
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... GATE pins to the MOSFET gates should be kept short and wide enough to easily handle the 1A of drive current. The switching components should be placed close to the ISL6527 first. Minimize the length of the connections between the input capacitors and the power switches by placing IN them nearby ...
Page 9
... Component Selection Guidelines Charge Pump Capacitor Selection A capacitor across pins CT1 and CT2 is required to create the proper bias voltage for the ISL6527 when operating the IC from 3.3V. Selecting the proper capacitance value is important so that the bias current draw and the current required by the MOSFET gates do not overburden the ...
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... Given a sufficiently fast control loop design, the ISL6527 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 ...
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... These equations assume linear voltage-current transitions and do not adequately model power loss due the reverse-recovery of the upper and lower MOSFET’s body diode. The gate-charge losses are dissipated by the ISL6527 and don't heat the MOSFETs. However, large gate-charge increases the switching interval, t ...
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... Otherwise, the recovery charge, Q have to be added to the gate charge of the MOSFET and taken into consideration when calculating the minimum bootstrap capacitance. ISL6527 DC-DC Converter Application Circuit Figure 8 shows an application circuit of a DC-DC Converter. Detailed information on the circuit, including a complete Bill-of-Materials and circuit board description, can be found in Application Note AN9994 ...
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... 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 ISL6527 M14.15 (JEDEC MS-012-AB ISSUE C) 14 LEAD NARROW BODY SMALL OUTLINE PLASTIC M B ...
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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 14 ISL6527 L16.5x5B 16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VHHB ISSUE C) ...