DESCRIPTION The ISL6226 provides both power control and protection for user-selected output voltage notebook applications where high performance is required. The IC integrates a fixed, selectable frequency pulse width modulation (PWM) controller and a 3A LDO linear regulator controller, monitoring and protection circuitry, in a 24-pin SSOP package. The PWM controller regulates the input voltage of the battery, and the output voltage selected by the user. Hysteretic operation of the converter and synchronization at light loads contributes to high efficiency over wide variations in input voltage and load range. Efficiency can be further improved by using the reduced RDS(ON) of the MOSFET as the current sensing element. Input voltage feed-forward regulation ramps, current-mode control, and internal feedback compensation provide fast, stable handling of load transients encountered during input voltage processing in advanced portable computer chipsets. The internal linear regulator controller provides a user-selectable high-current output input with an unregulated user-selectable current limit.

Features • Provides two voltage regulators
- Linear regulator, user selectable, current limit
- Wide line and high efficiency PWM over load range
- Synchronous buck converter based on PWM output
- Hysteresis at light load operation • Dual mode operation:
- Input VIN directly from the battery, which is 5.6V to 24V or 5V to VCC
• PWM output adjustable from 0.9V to 0.93* of VIN
• Low dropout (LDO) linear regulators operating in
+0.5 V to 24V output voltage LDO output adjustable
- from 0.8V to 3.8V at 0 a 3A for NPN transistors
- From 0.8V to 3.0V to 3A N-MOSFET at 0A • 300/600kHz switching frequency selectable • Forced PWM mode control scheme • No current sense resistor required for PWM output
- Utilize the impedance RDS(ON) of the MOSFET
- Optional current sense resistor for more precision • Independent soft-start for both PWM and LDO
• Independent two PWM and LDO enable pins Advanced configuration and power interface (ACPI) compatibility • Input under-voltage lockout (UVLO) protection • Good dynamic response
- Input voltage feedforward and current mode control • Monitor output voltage and provide status of PGOOD
• Thermal shutdown protection

Application • Mobile PC
• Handheld portable instruments • Other devices and devices with up to 24V input...