High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers
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Overview
Description
The ISL6236A dual step-down, switch-mode power-supply (SMPS) controller generates logic-supply voltages in battery-powered systems. The ISL6236A 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 0V to 2. 5V by setting REFIN2 voltage. An optional external charge pump can be monitored through SECFB. This device 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 ISL6236A 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 100ns response to load transients while maintaining a relatively constant switching frequency. The unique 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.
Features
- Wide Input Voltage Range 4.5V to 25V
- Dual Fixed 1.05V/3.3V and 1.5V/5.0V Outputs or Adjustable 0.7V to 5.5V (SMPS1) and 0V to 2.5V (SMPS2), ±1.5% Accuracy
- Secondary Feedback Input (Maintains Charge Pump Voltage)
- 1.7ms Digital Soft-Start and Independent Shutdown
- Fixed 3.3V/5.0V, or Adjustable Output 0.7V to 4.5V, ±1.5% (LDO): 200mA
- 3.3V Reference Voltage ±2.0%: 5mA
- 2.0V Reference Voltage ±1.0%: 50µA
- Constant ON-TIME Control with 100ns Load-Step Response
- Frequency Selectable
- rDS(ON) Current Sensing
- Programmable Current Limit with Foldback Capability
- Selectable PWM, Skip or Ultrasonic Mode
- BOOT Voltage Monitor with Automatic Refresh
- Independent POK1 and POK2 Comparators
- Soft-Start with Pre-Biased Output and Soft-Stop
- Independent ENABLE
- High Efficiency - up to 97%
- Very High Light Load Efficiency (Skip Mode)
- 5mW Quiescent Power Dissipation
- Thermal Shutdown
- Extremely Low Component Count
- Pb-Free (RoHS Compliant)
Applications
Applications
- 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
- Telecommunications
Documentation
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Date | |
|---|---|---|
| PDF 3.68 MB | Datasheet | |
| PDF 5.51 MB 日本語 | Brochure | |
| PDF 169 KB | Product Change Notice | |
| PDF 326 KB | Product Change Notice | |
| PDF 295 KB | White Paper | |
| PDF 294 KB | Product Change Notice | |
| PDF 106 KB | Product Change Notice | |
| PDF 173 KB | Product Change Notice | |
| PDF 248 KB | Product Change Notice | |
| PDF 509 KB | Application Note | |
| PDF 397 KB | Application Note | |
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Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| QFN | Tray | 980 | Get Samples, | |
ISL6236AIRZ-T Active Samples Available |
QFN | Reel | 6000 | Get Samples, |
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Support
Renesas Samples
Select an orderable part number:
| Orderable Part ID | Sample |
|---|---|
| ISL6236AIRZ | Availability |
| ISL6236AIRZ-T | Availability |