ISL6236 DATASHEET PDF

ISL datasheet, ISL circuit, ISL data sheet: INTERSIL – High- Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers . ISL Datasheet, ISL PDF, ISL Data sheet, ISL manual, ISL pdf, ISL, datenblatt, Electronics ISL, alldatasheet, free, datasheet. Renesas Electronics ISL are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Renesas Electronics ISL

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The output of SMPS1 can also be adjusted from 0. This device features a linear regulator providing 3. The linear regulator provides up to mA output current with automatic linear-regulator bootstrapping to the BYP input.

When in switchover, the LDO output can source up to mA. The ISL includes on-board power-up sequencing, the power-good POK outputs, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown.

A constant ON-time PWM control scheme operates without sense resistors and provides ns response to load transients while maintaining a relatively constant switching frequency.

The isl2636 ultrasonic pulse-skipping mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include pulse skipping, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications.

Wide Input Voltage Range 5. Programmable Current Limit with Foldback Capability? Extremely Low Component Count? Notebook and Sub-Notebook Computers? These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. Copyright Intersil Americas Inc. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Do not operate at or near the maximum ratings listed for extended periods of time.

Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty.

See Tech Brief TB A V mV 93 3 FN Limits established by characterization and are not production tested.

Temperature limits established by characterization and are not production tested. Does not apply in PFM mode see further details on page Bypass to GND with a 0. REF can source up to 50? A for external loads. Bypass to GND with a 1? VREF3 can source up to 5mA for external loads. F capacitor if loaded. Leave open if there is no load.

ISL Datasheet PDF – Intersil

VIN is also used to power the linear regulators. Connect VIN to the battery input and bypass with a 1? LDO can provide a total of mA external loads. The LDO regulate at 3. When the LDO is set at 3. Bypass LDO output with a minimum of 4. There is no switchover in adjustable mode.

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ISL Datasheet, PDF – Alldatasheet

Connect BYP to 3. Connect to the SMPS1 output.

dagasheet It also serves as the SMPS1 feedback input in fixed-voltage mode. There is an internal 5? POK1 is high impedance when the output is in regulation and the soft-start circuit has terminated. POK1 is low in datashfet. Drive EN1 below 0. Connect to an external capacitor according to the typical application circuits Figures 66, 67 and F MLCC ceramic capacitor. Connect a resistive voltage-divider from 14V charge pump output to GND to detect the output. This will refresh the external charge pump driven by LGATE1 without over-discharging the output voltage.

Connect externally to the underside of the exposed pad. Connect PGND externally to the underside of the exposed pad.

Drive EN2 below 0. POK2 is high impedance when the output is in regulation and the soft-start circuit has terminated. POK2 is low in shutdown. Connect to REF or leave floating for ultrasonic skip mode operation. Connect to the SMPS2 output.

It also serves as the SMPS2 feedback input in fixed-voltage mode. Output voltage control for SMPS2.

Continued 50 45 40 35 30 25 20 15 10 5 0 0. This will refresh an external osl6236 charge pump without overcharging the output voltage. The input supply range is 5. Light-load efficiency is enhanced by automatic Idle-Mode operation, a variable-frequency pulse-skipping mode that reduces transition and gate-charge losses.

The ISL is designed primarily for battery-powered applications where high efficiency and low-quiescent supply current are critical. The ISL 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 ISL includes an adjustable low drop-out linear regulator. The bias generator blocks include the linear regulator, 3. The synchronous-switch gate drivers are directly powered from PVCC, while the high-side switch gate drivers are indirectly powered from PVCC through an external capacitor and an internal Schottky diode boost circuit.

Internal LDO is disabled. Internal LDO is active. The high-side switch ON-time is inversely proportional to the battery voltage as measured by the VIN input and proportional to the output voltage.

This algorithm results in a nearly constant switching frequency despite the lack of a fixed-frequency clock generator. The benefit of a constant switching frequency is that the frequency can be selected to avoid noise-sensitive frequency regions: Switching frequency increases as a function of load current due to the increasing drop dataseet the synchronous rectifier, which causes a faster inductor-current discharge ramp.

ON-times translate only roughly to switching frequencies. Also, the dead-time effect increases the effective ON-time, reducing the switching frequency. The high-side switch ON-time is determined by a one-shot whose period is inversely proportional to input voltage and directly proportional to output voltage.

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Another one-shot sets a iso6236 OFF-time ns typ. The ON-time one-shot triggers when the following conditions are met: The controller utilize the valley point of the output ripple to regulate and ratasheet the OFF-time.

Each fast, low-jitter, adjustable one-shot includes circuitry that varies the 20 For loads above the critical conduction point, the actual switching frequency is: VDROP1 is the sum of the parasitic voltage drops in the inductor discharge path, including synchronous rectifier, inductor, and PC board resistances? VDROP2 is the sum of the parasitic voltage drops in the charging path, including high-side switch, inductor, and PC board resistances?

F Q1a OUT1 1. F Q3b C4 0. F D1b C8 0. This switchover is affected by a comparator that truncates the low-side switch ON-time at the inductor current’s zero crossing. This mechanism causes the threshold between pulse-skipping PFM and non-skipping PWM operation to coincide with the boundary between continuous and discontinuous inductor-current operation also known as the critical conduction point: The crossover point occurs at an even lower value if a swinging soft-saturation inductor is used.

Trade-offs in PFM noise vs light-load efficiency are made by datasheer the inductor value. Generally, low inductor values produce a broader efficiency vs load curve, while higher values result in higher FN Penalties for using higher inductor values include larger physical size and degraded load-transient response especially at low input-voltage levels.

DC output accuracy specifications refer to the trip level of the error comparator.

ISL6236 Datasheet

Disabling the zero-crossing detector causes the low-side, gate-drive waveform to become the complement of the high-side, gate-drive waveform. The benefit of forced-PWM mode is to keep the switching frequency fairly constant, but it comes at a cost: Forced-PWM mode is most useful for reducing audio-frequency noise, improving load-transient response, providing sink-current capability for dynamic output voltage adjustment, and improving the cross-regulation of multiple-output applications that use a flyback transformer or coupled inductor.

VREF3 can supply up to 5mA for external loads. Leave it open if there is no load. REF can supply up to 50? In an adjustable mode, the LDO output can be set from 0. The LDO regulator can supply up to mA for external loads.