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Renesas ISL85003FRZ-T
- Part No.:
- ISL85003FRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85003FRZ-T.pdf
- Description:
- IC REG BUCK ADJ 3A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,197
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Product details
Overview
ISL85003FRZ-T from Renesas Electronics is a highly efficient 3A synchronous buck regulator with integrated high-side (65mΩ) and low-side (45mΩ) N-channel MOSFETs, operating from 4.5V to 18V input and delivering ±1% output regulation down to 0.8V in a compact 3mm×4mm 12-lead DFN package. It supports automatic DCM/CCM mode switching for light-load efficiency and features internal 500kHz switching frequency with external synchronization capability up to 2MHz.
For engineers reviewing the ISL85003FRZ-T datasheet, ISL85003FRZ-T pinout, ISL85003FRZ-T application, or ISL85003FRZ-T equivalent, key selection considerations include its integrated FETs, DCM/CCM auto-transition, 500kHz fixed-frequency operation (with sync option), ±1% VFB accuracy, and robust protection suite including overcurrent, overvoltage, and thermal shutdown.
Technical Context
The ISL85003FRZ-T implements current-mode control with slope compensation (550mV/µs at 500kHz) and an error amplifier featuring 5.5MHz open-loop bandwidth and 70dB gain. Its DCM/CCM transition is managed by zero-crossing detection and gate-drive logic that disables the low-side FET under light load to minimize conduction loss.
It integrates a 5V LDO (VDD) derived from VIN, with 4.3–5.5V output and 50mA current limit, and employs lossless current sensing via temperature-compensated rDS(ON) monitoring of both internal MOSFETs. The SYNC pin enables external clock synchronization (300kHz–2MHz) or CCM-only operation via pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports standard 5V, 12V, and 15V rails with headroom for transients. |
| Output Current | Continuous 3A - sufficient for point-of-load conversion in embedded computing and networking. |
| Feedback Reference | 0.792V to 0.808V (±1%) - ensures tight output regulation across line, load, and temperature. |
| Switching Frequency | 500kHz (internal default), synchronizable 300kHz–2MHz - balances efficiency, size, and EMI performance. |
| High-Side rDS(ON) | 65mΩ (typ.) - reduces conduction loss at high duty cycles, improving full-load efficiency. |
| Low-Side rDS(ON) | 45mΩ (typ.) - minimizes freewheeling loss, critical for light-load DCM efficiency. |
| Enable Threshold | 0.5V–0.7V rising edge - compatible with standard logic-level enable signals and microcontroller GPIOs. |
| Power-Good Window | 80–120% of regulated output - provides reliable system sequencing with 3% hysteresis. |
Pinout & Package
ISL85003FRZ-T is housed in a thermally enhanced 12-lead 3mm×4mm Dual Flat No-Lead (DFN) package with exposed PGND pad for optimal thermal dissipation. The package complies with RoHS and MSL3 reflow standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (Pin 1) | Synchronization & mode control input | Configures CCM-only (pull-up to VDD), DCM-only (tie to AGND), or external sync (positive-edge trigger, 300kHz–2MHz). |
| PG (Pin 2) | Open-drain power-good output | Signals valid regulation after 1.5ms delay; requires external 10kΩ–100kΩ pull-up to VDD or ≤5.5V rail. |
| EN (Pin 3) | Enable control input | Active-high; device enabled when voltage exceeds 0.6V (60mV hysteresis); <0.5V disables regulator. |
| FB (Pin 4) | Feedback node for output voltage divider | Connects to resistor divider; regulates output to 0.8V reference; leakage <10nA preserves accuracy. |
| COMP (Pin 5) | Error amplifier compensation node | Supports internal compensation (tie to AGND) or external network (COMP–FB) for custom loop response. |
| AGND (Pin 6) | Analog ground reference | Return path for control circuitry; must connect to PCB ground plane-internally tied to PGND. |
| PHASE (Pins 7, 8) | Switch node connection | Drives external output inductor; carries high di/dt switching current; requires low-inductance layout. |
| VIN (Pins 9, 10) | Main power input | Accepts 4.5V–18V; requires local 10µF ceramic decoupling to PGND near pins. |
| VDD (Pin 11) | Internal 5V LDO output | Supplies core analog blocks; bypass with 1µF capacitor; tie directly to VIN if VIN = 4.5V–5.5V. |
| BOOT (Pin 12) | Bootstrap supply for high-side gate driver | Requires 0.1µF capacitor between BOOT and PHASE to sustain high-side FET gate drive. |
| PGND (Pin 13 + EPAD) | Power ground and thermal pad | Source of low-side FET; must connect to PCB ground plane using ≥8 vias for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side FETs | Eliminates external MOSFET selection and layout complexity while optimizing rDS(ON) matching (65mΩ/45mΩ). |
| Auto DCM/CCM Transition | Maintains >90% efficiency at 10mA load (DCM) and >95% at 3A (CCM), extending battery life in portable systems. |
| External Frequency Sync | Enables EMI reduction via spread-spectrum or noise-sensitive system clock alignment (300kHz–2MHz range). |
| Lossless Current Sensing | Derives current limit from MOSFET rDS(ON) without sense resistors-preserving efficiency and board space. |
| Comprehensive Fault Protection | Includes positive/negative overcurrent, input/output overvoltage, thermal shutdown (165°C), and UVLO (4.35V rise). |
| Prebiased Output Support | Allows safe startup into precharged outputs-critical for hot-swap and multi-rail sequencing applications. |
Applications
| Network Power Supplies | Industrial PLCs |
|---|---|
Use Scenario: Regulating 12V intermediate bus to 3.3V/1.8V for FPGA I/O and core logic in Ethernet switches. IC Role / Device Role / Timing Role: Primary point-of-load (POL) regulator delivering stable 3A output with fast transient response (<50µs recovery). Use Value: Integrated FETs and 500kHz switching enable compact, high-density power delivery meeting IPC-9592 thermal requirements. | Use Scenario: Powering microcontroller, ADC, and isolated communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Main 5V/3.3V supply with robust input surge tolerance (18V max) and wide -40°C to +125°C operation. Use Value: ±1% regulation and thermal shutdown ensure reliability in uncontrolled industrial environments. |
| Multifunction Printers | Embedded Computing |
Use Scenario: Supplying motor drivers, image sensors, and SoC subsystems requiring sequenced 5V, 3.3V, and 1.2V rails. IC Role / Device Role / Timing Role: Secondary POL regulator supporting soft-start programmability (via external cap on SS pin) for controlled voltage ramp. Use Value: DCM operation at standby reduces quiescent current to 4.5mA, lowering system idle power. | Use Scenario: Providing core voltage to ARM-based SBCs or edge AI accelerators with dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling >95% peak efficiency at 3A, minimizing thermal design burden. Use Value: Internal compensation and 0.8V reference simplify design of adaptive voltage scaling (AVS) circuits. |
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 | 3A, 4.5–36V input, fixed 500kHz, no sync input, no DCM mode, higher rDS(ON) (110mΩ/75mΩ) | Lacks light-load efficiency optimization and external synchronization; suited for cost-sensitive, fixed-frequency designs. | Select when sync capability and DCM operation are unnecessary and wider input range (up to 36V) is required. |
| TPS54302DDCR | 3A, 4.5–28V input, 500kHz, no DCM, no sync, integrated compensation only, lower VFB accuracy (±1.5%) | Higher output voltage drift and no light-load efficiency enhancement; simpler but less precise regulation. | Choose for legacy TI ecosystem compatibility where ±1% regulation and DCM are not critical. |
Compared with MP2451DT-LF-Z and TPS54302DDCR, the ISL85003FRZ-T delivers superior light-load efficiency via DCM/CCM auto-transition, tighter ±1% output accuracy, and flexible synchronization-making it optimal for noise-sensitive, battery-aware, or thermally constrained applications.
Availability
ISL85003FRZ-T is available at Aetrix Electronics and suitable for network infrastructure, industrial automation, and embedded computing applications requiring stable component supply, long-term manufacturability, and automotive-grade temperature support (-40°C to +125°C).
Supply support for ISL85003FRZ-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 is a global semiconductor leader specializing in microcontrollers, analog power, and timing solutions, with deep expertise in high-efficiency power management ICs.
The ISL85003FRZ-T belongs to Renesas' ISL8500x family of integrated synchronous buck regulators, engineered for compact, high-reliability DC/DC conversion in space-constrained industrial and communications equipment.
FAQ
What is the maximum continuous output current supported by the ISL85003FRZ-T?
The ISL85003FRZ-T supports a continuous output current of 3A under recommended operating conditions (TA ≤ +85°C, proper PCB thermal design with ≥8 vias to PGND). Derating applies above 85°C ambient per θJA = 49°C/W; at 125°C junction, output current reduces to approximately 2.1A.
Does the ISL85003FRZ-T support external synchronization, and what is its valid frequency range?
Yes, the ISL85003FRZ-T supports external synchronization via the SYNC pin. Its valid synchronization frequency range is 300kHz to 2MHz, with positive-edge triggering. The internal oscillator defaults to 500kHz, and SYNC can also be used to force CCM-only operation (pull-up to VDD) or DCM-only (tie to AGND).
How does the ISL85003FRZ-T handle light-load conditions to maintain efficiency?
The ISL85003FRZ-T automatically transitions between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) based on load current. In DCM, the low-side MOSFET is disabled during light load, eliminating reverse recovery losses and sustaining >90% efficiency at 10mA-critical for always-on IoT nodes.
What protection features are integrated into the ISL85003FRZ-T?
The ISL85003FRZ-T integrates positive/negative overcurrent protection (4.0–6.0A / –1.1 to –3.2A), input overvoltage lockout (19–20V), output overvoltage protection, thermal shutdown (165°C with 10°C hysteresis), and undervoltage lockout (4.35V rising threshold). All protections latch off or auto-recover per fault type.
Can the ISL85003FRZ-T be used with prebiased outputs, and how is this enabled?
Yes, the ISL85003FRZ-T supports prebiased output startup. This is enabled by default-no configuration required. The controller monitors the FB pin during enable and adjusts gate drive to avoid sinking current from a precharged output, preventing output voltage collapse or inrush damage.
ISL85003FRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-T FAQ
1.How can I place an order for ISL85003FRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85003FRZ-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 ISL85003FRZ-T reliable?
The price and inventory of ISL85003FRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85003FRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85003FRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85003FRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85003FRZ-T?
ISL85003FRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85003FRZ-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 ISL85003FRZ-T?
For technical support, including ISL85003FRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85003FRZ-T requirements.
6.How does Aetrix verify that ISL85003FRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85003FRZ-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 ISL85003FRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85003FRZ-T?
All ISL85003FRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85003FRZ-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 ISL85003FRZ-T part is unused and in its original packaging.
Return procedure for ISL85003FRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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