My Inquiry
My Account
Renesas ISL9440BIRZ-T
- Part No.:
- ISL9440BIRZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL9440BIRZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,794
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL9440BIRZ-T from Renesas Electronics (formerly Intersil) is a quad-output power management IC integrating three synchronous buck PWM controllers and one low-dropout linear regulator controller. It delivers 0.8V–12V adjustable outputs, operates at 300kHz fixed switching frequency, supports out-of-phase (0°/180°/0°) operation to reduce input ripple, and includes programmable soft-start, independent enable inputs, and full protection suite (UV/OV/OC/OT). It powers multi-rail systems in cable modems and VoIP gateways.
For engineers reviewing the ISL9440BIRZ-T datasheet, ISL9440BIRZ-T pinout, ISL9440BIRZ-T application, or ISL9440BIRZ-T equivalent, key selection considerations include its 32-pin 5×5mm QFN package, triple-buck + LDO architecture, 5.6–24V input range, early warning function on VIN, and independent EN/SS control for precise rail sequencing in space-constrained home connectivity and industrial power designs.
Technical Context
The ISL9440BIRZ-T implements current-mode PWM control with voltage feed-forward ramp generation, enabling robust line regulation and simplified loop compensation. Its internal 5V LDO supplies bias for all controllers and gate drivers, with dropout ≤600mV and 60mA output capability.
All three buck channels feature adaptive shoot-through protection, pre-biased start-up, no external current-sense resistor (using MOSFET rDS(ON)), and cycle-by-cycle current limiting. The linear regulator channel drives PNP BJTs or P-channel MOSFETs with 0.8V reference and 50mA sink capability on LDOFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 300 kHz fixed - enables compact magnetics and predictable EMI profile for multi-rail set-top box power supplies. |
| Input Voltage Range | 5.6 V to 24 V - supports wide-input industrial and broadband equipment powered from 12V/19V/24V rails. |
| Output Voltage Range | 0.8 V to 12 V adjustable per channel - accommodates core, I/O, and auxiliary rails including 1.0V, 1.8V, 2.5V, 3.3V, 5V, and 12V. |
| Soft-Start Current | 1.55 µA (typical) - sets precise, capacitor-programmable soft-start timing without external current sources. |
| Early Warning Threshold | VIN falling below 5.55 V (typical) triggers PGOOD low - provides system-level data backup window before brownout. |
| Thermal Shutdown | 150 °C with 20 °C hysteresis - protects against sustained overload or poor PCB thermal design in enclosed enclosures. |
| Package | 32-lead 5 mm × 5 mm QFN - surface-mount footprint with exposed thermal pad for efficient heat dissipation in high-density layouts. |
Pinout & Package
ISL9440BIRZ-T is housed in a 32-lead, 5 mm × 5 mm, RoHS-compliant QFN package (PKG DWG # L32.5x5B) with exposed thermal pad. Pin 1 is located at top-left corner (marked by dot); pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/SS1, EN/SS2, EN/SS3 (Pins 5, 14, 17) | Independent enable & soft-start control inputs | Each pin enables its respective buck channel and accepts an external capacitor to program soft-start time and sequencing delay. |
| FB1, FB2, FB3, LDOFB (Pins 6, 13, 16, 10) | Voltage feedback inputs | Connect to resistor dividers to set output voltage; also used by PGOOD circuitry to monitor regulation status. |
| ISEN1, ISEN2, ISEN3 (Pins 1, 24, 18) | Current-sense inputs | Monitor voltage drop across lower MOSFETs' rDS(ON) for current-loop control and overcurrent protection-no external sense resistor required. |
| UGATE1–3, LGATE1–3 (Pins 30, 27, 21, 29, 28, 22) | High-side and low-side gate drivers | Drive external N-channel MOSFETs; UGATE channels support 800 mA source / 2 A sink; LGATE3 rated for 400 mA sink/source. |
| BOOT1–3 (Pins 31, 26, 20) | Bootstrap supply pins | Internally integrate bootstrap diodes-reduces BOM count and layout complexity for high-side gate drive. |
| PGOOD (Pin 2) | Open-drain power-good indicator | Asserts low if any buck output deviates >10%, LDO output drops <75%, or VIN falls below 5.55 V-enables system reset coordination. |
| RST (Pin 8) | Reset pulse output | Drives low 5.5 µs after PGOOD falls-provides deterministic system reset timing for microcontrollers and FPGAs. |
| VIN (Pin 4) | Main power input | Accepts 5.6–24 V; powers internal circuits and enables early warning detection; must be tied to VCC_5V for 5 V ±10% operation. |
| VCC_5V (Pin 3) | Internal 5 V LDO output | Supplies IC bias, gate drivers, and boot circuitry; requires ≥4.7 µF ceramic decoupling; delivers up to 60 mA. |
| SGND (Pin 11), PGND (Pin 23) | Signal and power ground returns | SGND is small-signal reference; PGND carries high-current return paths for all lower MOSFETs-separate routing recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Triple Synchronous Buck + Linear Regulator | Single-chip solution for four independent regulated rails-eliminates discrete controller + LDO combinations and reduces board area by >40%. |
| Out-of-Phase Switching (0°/180°/0°) | Reduces RMS input current and input capacitor stress-enables smaller, lower-cost bulk capacitance in ATX and set-top box designs. |
| No External Current-Sense Resistor | Leverages MOSFET rDS(ON) for current sensing-lowers BOM cost, improves efficiency, and avoids parasitic errors from shunt placement. |
| Programmable Soft-Start via EN/SS Pins | 1.55 µA internal charge current allows precise, capacitor-defined ramp rates-prevents inrush-induced voltage droop on shared input rails. |
| Integrated Early Warning & Reset | Dedicated logic detects VIN decay before UVLO-gives host processor time to save state; RST provides synchronized hardware reset. |
| Adaptive Shoot-Through Protection | Prevents cross-conduction in high-side/low-side MOSFET pairs-ensures reliable operation across temperature and process variations. |
Applications
| Cable Modem Power Supply | Voice over IP Gateway |
|---|---|
|
Use Scenario: Powers CPU core (1.0V/6A), memory I/O (3.3V/6A), PHY (5.0V/4A), and analog subsystem (2.5V/0.8A) from 12V input. IC Role / Device Role / Timing Role: Quad-output PMIC providing sequenced, regulated rails with independent soft-start and fault reporting. Use Value: Reduces component count vs. discrete controllers; out-of-phase switching cuts input ripple by >50%, allowing smaller 105°C input capacitors. |
Use Scenario: Supplies FPGA core (1.2V), DDR3 interface (1.5V), Ethernet PHY (3.3V), and VoIP codec (2.5V) from 19V adapter. IC Role / Device Role / Timing Role: Centralized power manager coordinating rail-up sequence and generating PGOOD/RST signals for system initialization. Use Value: Programmable EN/SS pins enable strict 1.2V→1.5V→3.3V→2.5V startup order; early warning prevents call drop during AC brownout. |
| Satellite Set-Top Box | Industrial NAS Controller |
|
Use Scenario: Delivers 1.1V/12A (SoC), 3.3V/15A (tuner), 5.0V/15A (HDMI), and 12V/12A (LNB supply) from 24V input. IC Role / Device Role / Timing Role: High-current multi-rail controller with thermal monitoring and overvoltage lockout for field-reliable operation. Use Value: 150°C thermal shutdown and 118% OV threshold protect against transient surges on 24V distribution lines in outdoor installations. |
Use Scenario: Powers ARM SoC (1.0V), SATA controller (3.3V), USB hub (5.0V), and fan controller (12V) in fanless embedded storage enclosure. IC Role / Device Role / Timing Role: Compact, thermally optimized PMIC supporting wide ambient (-40°C to +85°C) and long-life reliability requirements. Use Value: 5×5mm QFN package with exposed pad achieves <2.3°C/W θJC-maintains junction temp <115°C under full load at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL9440IRZ | Fixed 1.7 ms soft-start (non-programmable); same 300 kHz frequency and pinout as ISL9440BIRZ-T. | Lacks EN/SS programmability-suitable only where fixed startup timing suffices and sequencing flexibility is not required. | Select ISL9440IRZ only if soft-start timing is fixed and bill-of-materials simplification outweighs loss of sequencing control. |
| MP2940AGQSE-LF-Z | Quad-buck controller with integrated MOSFET drivers but no linear regulator; 400 kHz switching; different pinout and enable logic. | Requires external LDO for fourth rail; lacks early warning and RST functions-needs additional supervisory IC for full system monitoring. | Choose MP2940AGQSE-LF-Z when higher switching frequency is prioritized and LDO functionality is implemented separately. |
Compared with ISL9440BIRZ-T, ISL9440IRZ offers identical topology and protection but sacrifices soft-start programmability, while MP2940AGQSE-LF-Z trades integrated LDO and early warning for higher frequency and driver integration-making ISL9440BIRZ-T optimal for cost-sensitive, space-constrained, and system-monitoring-critical applications.
Availability
ISL9440BIRZ-T is available at Aetrix Electronics and suitable for cable modems, VoIP gateways, and satellite set-top boxes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9440BIRZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics acquired Intersil in 2017 and maintains full technical and manufacturing continuity for the ISL9440 family. Renesas is a global semiconductor leader specializing in microcontrollers, analog, and power management solutions.
The ISL9440 series was designed specifically for multi-rail power delivery in broadband communications equipment-emphasizing integration, sequencing control, and system-level supervision for cable, satellite, and voice infrastructure.
FAQ
What is the switching frequency of the ISL9440BIRZ-T?
The ISL9440BIRZ-T operates at a fixed 300 kHz switching frequency across all three PWM channels. This frequency is factory-trimmed and does not require external components for setting. It balances efficiency, magnetic size, and EMI performance for mid-power applications such as cable modems and VoIP gateways. The ISL9440BIRZ-T datasheet specifies typical variation of ±13% (260–340 kHz) over temperature and input voltage.
Does the ISL9440BIRZ-T require external current-sense resistors?
No, the ISL9440BIRZ-T does not require external current-sense resistors. It uses the rDS(ON) of the lower MOSFETs for current sensing via the ISEN1–3 pins. This eliminates power loss and board space associated with shunt resistors, while maintaining accurate overcurrent protection and current-mode control. The device supports full-scale input currents of 15 µA at the ISEN pins, corresponding to typical MOSFET voltage drops in the 10–30 mV range.
How does the early warning function work on the ISL9440BIRZ-T?
The ISL9440BIRZ-T monitors the VIN pin voltage continuously. When VIN falls below 5.55 V (typical), the PGOOD pin is pulled low-triggering system-level response before undervoltage lockout occurs. This early warning provides a deterministic window (typically >100 ms at light load) for host processors to back up critical data. The function is enabled by default and requires no configuration; it is distinct from the main UVLO threshold of 3.7 V on the VCC_5V rail.
Can the ISL9440BIRZ-T operate from a 5 V input supply?
Yes, the ISL9440BIRZ-T supports 5 V ±10% operation by connecting VIN directly to the VCC_5V pin. In this mode, the internal 5 V LDO is disabled, and the device is powered entirely from the external 5 V supply. The datasheet specifies valid input range as 4.5 V to 5.6 V under this configuration. Decoupling remains mandatory: a minimum 4.7 µF ceramic capacitor must be placed close to the VCC_5V pin.
What is the purpose of the RST pin on the ISL9440BIRZ-T?
The RST pin on the ISL9440BIRZ-T is an open-drain reset output that asserts low 5.5 µs (typical) after PGOOD falls. It provides a synchronized hardware reset signal to microcontrollers, FPGAs, or ASICs, ensuring deterministic system recovery during input brownout, output fault, or thermal shutdown. Unlike PGOOD-which reflects combined rail status-RST delivers a clean, timed reset pulse without requiring external timing components.
ISL9440BIRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (3), Linear (LDO) (1)
- Number of Outputs:
- 4
- Frequency - Switching:
- 300kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- Controller
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 24V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ISL9440BIRZ-T FAQ
1.How can I place an order for ISL9440BIRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9440BIRZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL9440BIRZ-T reliable?
The price and inventory of ISL9440BIRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9440BIRZ-T is usually 5 days.
3.What payment methods are accepted for ISL9440BIRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9440BIRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9440BIRZ-T?
ISL9440BIRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9440BIRZ-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL9440BIRZ-T?
For technical support, including ISL9440BIRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9440BIRZ-T requirements.
6.How does Aetrix verify that ISL9440BIRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9440BIRZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL9440BIRZ-T meets industry standards.
7.What is the process for return or replacement of ISL9440BIRZ-T?
All ISL9440BIRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9440BIRZ-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL9440BIRZ-T part is unused and in its original packaging.
Return procedure for ISL9440BIRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL9440BIRZ-T Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
