ISL6237IRZ

Product Summary

The ISL6237IRZ is a dual step-down, switch-mode power-supply (SMPS) controller. It generates logic-supply voltages in battery-powered systems. The ISL6237IRZ includes two pulse-width modulation (PWM) controllers, 5V/3.3V and 1.5V/1.05V. The output of SMPS1 can also be adjusted from 0.7V to 5.5V. The SMPS2 output can be adjusted from 0.5V to 2.5V by setting REFIN2 voltage. This device ISL6237IRZ features a linear regulator providing 3.3V/5V, or adjustable from 0.7V to 4.5V output via LDOREFIN. The linear regulator provides up to 100mA output current with automatic linear-regulator bootstrapping to the BYP input. When in switchover, the LDO output can source up to 200mA. The ISL6237IRZ includes on-board power-up sequencing, power-good (POK_) outputs, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown. The applications of the ISL6237IRZ are Notebook and Sub-Notebook Computers, PDAs and Mobile Communication Devices, 3-Cell and 4-Cell Li+ Battery-Powered Devices, DDR1, DDR2, and DDR3 Power Supplies, Graphic Cards, Game Consoles and Telecommunication.

Parametrics

ISL6237IRZ absolute maximum ratings: (1)VIN, EN_LDO to GND: -0.3V to +27V; (2)BOOT_ to GND: -0.3V to +33V; (3)BOOT_ to PHASE_: -0.3V to +6V; (4)VCC, EN_, SKIP, TON, PVCC, POK_ to GND: -0.3V to +6V; (5)LDO, FB1, REFIN2, LDOREFIN to GND: -0.3V to (VCC + 0.3V); (6)OUT_, REF to GND: -0.3V to (VCC + 0.3V; (7)UGATE_ to PHASE_: -0.3V to (PVCC + 0.3V); (8)ILIM_ to GND: -0.3V to (VCC + 0.3V); (9)LGATE_, BYP to GND: -0.3V to (PVCC + 0.3V); (10)PGND to GND: -0.3V to + 0.3V; (11)VCC Short Circuit to GND: 1s; (12)LDO Current (Internal Regulator) Continuous : 100mA; (13)LDO Current (Switched Over to OUT1) Continuous: +200mA.

Features

ISL6237IRZ features: (1)Wide Input Voltage Range 5.5V to 25V; (2)Dual Fixed 1.05V/3.3V and 1.5V/5.0V Outputs or Adjustable 0.7V to 5.5V (SMPS1) and 0.5V to 2.5V (SMPS2), ±1.5% Accuracy; (3)1.7ms Digital Soft-Start and Independent Shutdown; (4)Fixed 3.3V/5.0V, or Adjustable Output 0.7V to 4.5V, ±1.5% (LDO): 200mA; (5)2.0V Reference Voltage; (6)Constant ON-TIME Control with 100ns Load-Step Response; (7)Selectable Switching Frequency; (8)rDS(ON) Current Sensing; (9)Programmable Current Limit with Foldback Capability; (10)Selectable PWM, Skip or Ultrasonic Mode; (11)BOOT Voltage Monitor with Automatic Refresh; (12)Independent POK1 and POK2 Comparators; (13)Soft-Start with Pre-Biased Output and Soft-Stop; (14) Independent ENABLE; (15)High Efficiency - Up to 97%; (16)Very High Light Load Efficiency (Skip Mode); (17)5mW Quiescent Power Dissipation; (18)Thermal Shutdown; (19)Extremely Low Components Count; (20)Pb-Free (RoHS Compliant).

Diagrams