ISL9440C Triple Step-Down PWM and Single Linear Controller with Programmable Soft-Start

ISL9440C

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Triple Step-Down PWM and Single Linear Controller with Programmable Soft-Start

Datasheets,
Related Docs
& Simulations

Ordering Information

iBuy direct from Intersil	iBuy direct - out of stock	Request samples
Check distributor inventory	Available in RoHS/Pb-Free

Part No.

Design-In
Status

Temp.

Package

MSL

Price
US $

ISL9440CIRZ

Active

Ind

32 Ld QFN

4.67

ISL9440CIRZ-T

Active

Ind

32 Ld QFN T+R

4.67

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

Description

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 r_DS(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)

Related Documentation

Datasheet(s):
Triple Step-Down PWM and Single Linear Controller with Programmable Soft-Start

Technical Brief(s):
PCB Land Pattern Design and Surface Mount Guidelines for QFN (MLFP) Packages

Evaluation Board(s):
ISL9440CEVAL1Z: Triple PWM Step-Down Synchronous Buck Controller and One LDO

Technical Homepage:
Automotive

i-Sim:
iSim ISL9440C

Parametric Data


V_IN (min) (V)		4.5

V_IN (max) (V)		24

V_OUT1 (min) (V)		.8

V_OUT1 (max) (V)		24

V_OUT2 (V)		Adj.

V_OUT3 (V)		Adj.

I_OUT1 (A)		20

I_OUT2 (A)		20

Applications

Satellite and Cable Set-Top Boxes
Cable Modems
VoX Gateway Devices
NAS/SAN Devices
ATX Power Supply

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