My Inquiry
My Account
Renesas ISL85003FRZ-T7A
- Part No.:
- ISL85003FRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85003FRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 3A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:100
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL85003FRZ-T7A from Renesas Electronics is a highly efficient 3A synchronous buck regulator with integrated high-side (65mΩ) and low-side (45mΩ) NFETs, operating from 4.5V to 18V input and delivering ±1% output regulation down to 0.8V. It supports automatic DCM/CCM mode switching for light-load efficiency and features 500kHz fixed-frequency operation with external synchronization up to 2MHz - ideal for point-of-load regulation in industrial embedded systems.
For engineers reviewing the ISL85003FRZ-T7A datasheet, ISL85003FRZ-T7A pinout, ISL85003FRZ-T7A application, or ISL85003FRZ-T7A equivalent, key selection criteria include its 3mm×4mm DFN-12 package, internal/external compensation flexibility, SYNC-controlled mode selection, open-drain power-good output, and robust protection suite including overcurrent, overvoltage, and thermal shutdown.
Technical Context
The ISL85003FRZ-T7A implements current-mode control with slope compensation (550mV/µs at 500kHz), enabling stable loop response across wide VIN/VOUT ranges. Its DCM/CCM auto-transition logic minimizes light-load quiescent current (4.5mA typical) while maintaining tight regulation (±1% over line/load/temp).
It integrates a 5V LDO (4.3–5.5V output) powered from VIN, a 0.8V reference with ±8mV tolerance, and lossless current sensing via rDS(ON)-based MOSFET voltage monitoring - eliminating external sense resistors and supporting precise 4.0–6.0A positive overcurrent protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports standard 12V rail and wide-input industrial supplies without pre-regulation. |
| Output Current | Continuous 3A - sufficient for FPGA core rails, microcontroller SoCs, and ASIC I/O domains. |
| Output Voltage Accuracy | ±1% over line, load, and temperature - ensures reliable downstream logic operation without margining overhead. |
| Switching Frequency | 500kHz nominal, syncable 300kHz–2MHz - balances EMI, inductor size, and efficiency for compact designs. |
| High-Side rDS(ON) | 65mΩ @ 100mA - reduces conduction loss at mid-to-high loads, enabling >95% peak efficiency. |
| Low-Side rDS(ON) | 45mΩ @ 100mA - lowers bottom-FET loss during freewheeling, critical for DCM efficiency. |
| Power-Good Threshold | 85% of regulated VOUT with 3% hysteresis - provides clean, glitch-free system enable sequencing. |
Pinout & Package
ISL85003FRZ-T7A is housed in a thermally enhanced 12-lead 3mm×4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (PGND). The package enables high-power density and low thermal resistance (θJA = 49°C/W, θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Synchronization & mode control input | Connect to AGND for DCM, VDD for forced CCM, or external clock (300kHz–2MHz) for EMI reduction. |
| 2 (PG) | Open-drain power-good output | Signals valid output after 1.5ms delay; requires external pull-up to VDD or ≤5.5V rail. |
| 3 (EN) | Enable input | Active-high logic: device enabled when voltage exceeds 0.6V (60mV hysteresis). |
| 4 (FB) | Feedback input | Connects to resistor divider; regulates output to 0.8V reference with ±8mV tolerance. |
| 5 (COMP) | Compensation node | Internal compensation selected by shorting to AGND; external network enables custom loop tuning. |
| 6 (AGND) | Analog ground reference | Return path for error amplifier and control circuitry; must be tied to PGND on PCB. |
| 7,8 (PHASE) | Switch node output | Drives external inductor; connects to BOOT capacitor and inductor switch node. |
| 9,10 (VIN) | Main power input | Supplies high-side gate driver and internal LDO; requires local 10µF ceramic decoupling. |
| 11 (VDD) | Internal 5V LDO output | Power source for analog/digital blocks; connect 1µF capacitor to ground; tie to VIN if VIN ≤5.5V. |
| 12 (BOOT) | Bootstrap supply | Connect 0.1µF capacitor between BOOT and PHASE to drive high-side NFET gate. |
| 13 (PGND) | Power ground / thermal pad | Source connection for low-side FET and primary thermal path; requires ≥8 vias to inner ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side NFETs | Eliminates external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| DCM/CCM auto-transition | Maintains >85% efficiency at 10mA load while delivering full 3A capability - no manual mode selection required. |
| Lossless current sensing | Uses internal rDS(ON) voltage drop for overcurrent detection - avoids sense-resistor power loss and board area. |
| Programmable soft-start (via SYNC pin function) | Enables controlled ramp-up of output voltage using external capacitor on SYNC pin - prevents inrush current. |
| Comprehensive fault protection | Includes positive/negative overcurrent, input/output overvoltage, thermal shutdown (165°C), and UVLO (4.35V rising). |
| External frequency synchronization | Accepts 300kHz–2MHz external clock on SYNC pin - enables multi-rail phase alignment and EMI spreading. |
Applications
| Industrial Process Control | Network Equipment Power |
|---|---|
|
Use Scenario: Powering programmable logic controllers (PLCs), sensor signal conditioners, and isolated I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator converting 12V/24V backplane supply. Use Value: ±1% regulation and -40°C to +125°C operation ensure stable MCU and ADC performance under thermal cycling and voltage transients. |
Use Scenario: Supplying 1.2V core and 3.3V I/O rails for Ethernet switches, routers, and baseband processors. IC Role / Device Role / Timing Role: Secondary buck stage following front-end AC/DC or DC/DC conversion. Use Value: 500kHz switching and compact DFN package enable high-density board layouts with minimal filter footprint. |
| Multifunction Printer Engine | Embedded Computing Systems |
|
Use Scenario: Delivering 1.8V and 2.5V to image processing ASICs and motor control microcontrollers in laser printer engines. IC Role / Device Role / Timing Role: Local regulator for noise-sensitive imaging subsystems requiring fast transient response. Use Value: DCM/CCM auto-transition maintains <100mV output deviation during burst-mode laser firing and idle states. |
Use Scenario: Providing regulated 0.8V–5V outputs for ARM-based SBCs, edge AI accelerators, and industrial HMIs. IC Role / Device Role / Timing Role: Flexible POL regulator supporting multiple voltage domains from single 12V input. Use Value: External resistor feedback and 0.8V reference allow precise matching to SoC VDD requirements without custom ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 500kHz frequency, no SYNC input, 2A max output, 4.5–36V input range | Lacks DCM/CCM auto-transition and external sync; suited for simpler, lower-current 12V-to-5V conversions | Select when input voltage may exceed 18V and 3A output is not required. |
| TPS54302DDCR | 3.5V–28V input, 3A output, 500kHz fixed freq, no DCM mode, integrated BOOT diode | Higher minimum input (3.5V), no light-load efficiency optimization, different pinout and compensation scheme | Choose for TI ecosystem compatibility and where thermal derating above 85°C is acceptable. |
Compared with MP2451DT-LF-Z and TPS54302DDCR, the ISL85003FRZ-T7A delivers superior light-load efficiency via DCM/CCM auto-transition, wider input voltage tolerance (4.5–18V vs. 3.5–28V or 4.5–36V), and flexible synchronization - making it optimal for thermally constrained, multi-rail industrial designs requiring precision regulation.
Availability
ISL85003FRZ-T7A is available at Aetrix Electronics and suitable for industrial process control, network equipment power, and embedded computing applications requiring stable component supply, RoHS-compliant packaging, and extended temperature support (-40°C to +125°C).
Supply support for ISL85003FRZ-T7A 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 is a global semiconductor leader specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and infrastructure markets.
The ISL85003FRZ-T7A belongs to Renesas' ISL8500x family of integrated synchronous buck regulators, designed specifically for high-efficiency, space-constrained point-of-load applications in harsh industrial environments.
FAQ
What is the recommended input capacitor for ISL85003FRZ-T7A?
A 10µF X5R/X7R ceramic capacitor placed close to the VIN pins (9 and 10) is recommended per the datasheet. This value ensures effective high-frequency decoupling and stability across the 4.5V–18V input range. For higher ripple current handling or transient suppression, parallel placement with a 1µF ceramic is advised - but the 10µF value remains the minimum required for reliable ISL85003FRZ-T7A operation.
Does ISL85003FRZ-T7A support external compensation?
Yes, ISL85003FRZ-T7A supports both internal and external compensation. Internal compensation is selected by connecting the COMP pin (5) directly to AGND (6). For custom loop response tuning - such as optimizing transient response in high-capacitance output stages - an external RC network can be placed between COMP and FB pins, as detailed in the "Loop Compensation Design" section of the FN7968 datasheet.
How does the SYNC pin function on ISL85003FRZ-T7A?
On ISL85003FRZ-T7A, the SYNC pin (1) serves dual functions: mode selection and external synchronization. Pulling SYNC to AGND enables DCM mode; tying it to VDD forces CCM; applying a 300kHz–2MHz external clock enables synchronization. An internal 1MΩ pull-up prevents floating states. This differs from ISL85003A's SS pin, confirming ISL85003FRZ-T7A's identity as the SYNC-enabled variant.
What is the thermal performance of ISL85003FRZ-T7A in its DFN package?
The ISL85003FRZ-T7A uses a 3mm×4mm DFN package with exposed thermal pad (PGND), achieving θJA = 49°C/W and θJC = 5°C/W. With ≥8 thermal vias to an internal ground plane, it sustains 3A continuous output at +85°C ambient without derating. Thermal shutdown activates at 165°C junction temperature with 10°C hysteresis, protecting the ISL85003FRZ-T7A during overload or poor airflow conditions.
Can ISL85003FRZ-T7A regulate output voltages below 0.8V?
No, ISL85003FRZ-T7A cannot regulate below 0.8V. Its internal reference is fixed at 0.8V ±8mV, and the feedback architecture requires the FB pin voltage to equal this reference. Output voltage is set by the resistor divider ratio: VOUT = 0.8V × (1 + R1/R2). Therefore, the lowest achievable regulated output is 0.8V - confirmed by datasheet specifications, typical application schematics, and electrical test conditions.
ISL85003FRZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL85003FRZ-T7A FAQ
1.How can I place an order for ISL85003FRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85003FRZ-T7A 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 ISL85003FRZ-T7A reliable?
The price and inventory of ISL85003FRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85003FRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL85003FRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85003FRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85003FRZ-T7A?
ISL85003FRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85003FRZ-T7A 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 ISL85003FRZ-T7A?
For technical support, including ISL85003FRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85003FRZ-T7A requirements.
6.How does Aetrix verify that ISL85003FRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL85003FRZ-T7A 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 ISL85003FRZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL85003FRZ-T7A?
All ISL85003FRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL85003FRZ-T7A, 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 ISL85003FRZ-T7A part is unused and in its original packaging.
Return procedure for ISL85003FRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL85003FRZ-T7A Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
