The ISL9440B and ISL9440C are quad-output synchronous buck controllers that integrate three PWM controllers and one low drop-out linear regulator controller, which are full featured and designed to provide multi-rail power for use in products such as cable and satellite
set-top boxes, VoIP gateways, cable modems, and other home connectivity products as well as a variety of industrial and general purpose applications. Each output is adjustable down to 0.8V. The PWMs are synchronized at 180° out-of-phase thus, reducing the RMS input current and ripple voltage.
The ISL9440B and ISL9440C offer programmable soft-start, independent enable inputs for ease of supply rail sequencing, and integrated UV/OV/OC/OT protections in a space conscious 5mmx5mm QFN package. An early warning function is offered to output a logic signal to warn the system to back up data when input voltage falls below a certain level.
The ISL9440B and ISL9440C utilize internal loop compensation to keep minimum peripheral components for compact design and a low total solution cost. These devices are implemented with current mode control with feed-forward to cover various applications even with fixed internal compensations.
Key Features
- Three Integrated Synchronous Buck PWM Controllers
- Internal Bootstrap Diodes
- Internal Compensation
- Independent Control for each Regulator and Programmable Output Voltages; Independent Enable/Shutdown/Soft-start
- Fixed Switching Frequency: 300kHz(B), 600kHz(C)
- Adaptive Shoot-Through Protection on all Synchronous Buck Controllers
- Pre-biased Output Start-up Capability
- Out-of-Phase Switching to Reduce Input Capacitance (0°/180°/0°)
- No External Current Sense Resistor
- Uses Lower MOSFET's rDS(ON)
- Current Mode Controller with Voltage Feed-Forward
- Complete Protection
- Overcurrent, Overvoltage, Undervoltage Lockout, Over-Temperature
- Cycle-by-Cycle Current Limiting
- Wide Input Voltage Range
- Input Rail Powers VIN Pin: 5.6V to 24V
- Input Rail Powers VCC_5V Pin (VIN tied to VCC_5V, for 5V input applications): 4.5V to 5.6V
- Early Warning on Input Voltage Failure
- Integrated Reset Function
- Pb-Free (RoHS Compliant)
Applications
- Satellite and Cable Set-Top Boxes
- Cable Modems
- VoX Gateway Devices
- NAS/SAN Devices
- ATX Power Supply
![Typical Diagram Typical Diagram](/image/intersil/isl9440b-c.jpg)
Order InformationPart Number | Package Type | Weight(g) | Pins | MSL Rating | Peak Temp (°C) | RoHS Status |
---|
|
ISL9440BIRZ | 32 Ld QFN | 0.07 | 32 | 3 | 260 | RoHS |
|
|
ISL9440BIRZ-T | 32 Ld QFN T+R | 0.07 | 32 | 3 | 260 | RoHS |
|
|
|
|
ISL9440BEVAL1Z | | | | N/A | | RoHS |
|
|