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| High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers |
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| Ordering Information |
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 iBuy direct from Intersil
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 iBuy direct - out of stock
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 Request samples
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 Check distributor inventory
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Available in RoHS/Pb-Free
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Part No. |
Design-In
Status |
Temp. |
Package |
MSL |
Price
US $ |
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| ISL6237EVAL1 |
Active |
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Eval Board |
N/A |
Contact Us |
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| ISL6237IRZ |
Active |
Ind |
32 Ld QFN |
3 |
2.85 |
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| ISL6237IRZ-T |
Active |
Ind |
32 Ld QFN T+R |
3 |
2.85 |
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| ISL6237EVAL1Z |
InActive |
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Eval Board |
N/A |
N/A |
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| The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice. |
| MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020 |
| SMD = Standard Microcircuit Drawing |
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 Description |
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The ISL6237 dual step-down, switch-mode power-supply (SMPS) controller generates logic-supply voltages in battery-powered systems. The ISL6237 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 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 ISL6237 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.
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. |
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 Key Features |
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Wide Input Voltage Range 5.5V to 25V
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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
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1.7ms Digital Soft-Start and Independent Shutdown
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Fixed 3.3V/5.0V, or Adjustable Output 0.7V to 4.5V, ±1.5% (LDO): 200mA
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2.0V Reference Voltage
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Constant ON-TIME Control with 100ns Load-Step Response
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Selectable Switching Frequency
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rDS(ON) Current Sensing
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Programmable Current Limit with Foldback Capability
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Selectable PWM, Skip or Ultrasonic Mode
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BOOT Voltage Monitor with Automatic Refresh
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Independent POK1 and POK2 Comparators
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Soft-Start with Pre-Biased Output and Soft-Stop
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Independent ENABLE
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High Efficiency - Up to 97%
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Very High Light Load Efficiency (Skip Mode)
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5mW Quiescent Power Dissipation
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Thermal Shutdown
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Extremely Low Components Count
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Pb-Free (RoHS Compliant)
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| Related Documentation |
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 Datasheet(s): |
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 Evaluation Board(s): |
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 Technical Homepage: |
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 Parametric Data |
| | VIN (min) (V) | | 5.5 | | | VIN (max) (V) | | 25 | | | VOUT1 (min) (V) | | 4.975 (Adj. 0.7) | | | VOUT1 (max) (V) | | 5.125 (Adj. 5.5) | | | VOUT2 (V) | | 3.3 (Adj. 0.5 to 2.5) | | | VOUT3 (V) | | 3.3 or 5 Linear (Adj. 0.7 to 4.5) | | | VOUT4 (V) | | 3.3 Always Linear | | | IOUT1 (A) | | 20 | |
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 Application Block Diagrams |
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| Applications |
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- 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
- Telecommunication
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| | ISL6236 | | High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers | | | ISL9440 | | Triple, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller | | | ISL9440B | | Triple Step-Down PWM and Single Linear Controller with Programmable Soft-Start | | | ISL9440C | | Triple Step-Down PWM and Single Linear Controller with Programmable Soft-Start | |
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