My Inquiry
My Account
Renesas ISL85005AFRZ-TK
- Part No.:
- ISL85005AFRZ-TK
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85005AFRZ-TK.pdf
- Description:
- IC REG BUCK ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,113
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL85005AFRZ-TK from Renesas Electronics is a monolithic synchronous buck regulator with integrated 5A/18V high-side and low-side MOSFETs, fixed 500kHz switching frequency, programmable soft-start via SS pin, and forced Continuous Conduction Mode (CCM) operation. It delivers up to 5A output current from 4.5V–18V input, features ±1% 0.8V feedback reference, and supports point-of-load regulation in embedded computing and battery-powered systems.
For engineers reviewing the ISL85005AFRZ-TK datasheet, ISL85005AFRZ-TK pinout, ISL85005AFRZ-TK application, or ISL85005AFRZ-TK equivalent, key selection criteria include its fixed-frequency CCM operation, 3.5µA SS charging current for adjustable startup ramp, integrated bootstrap diode with UV detection, thermal shutdown at 165°C, and 12-pin 3mm×4mm DFN package with EPAD.
Technical Context
The ISL85005AFRZ-TK implements current-mode control with internal slope compensation (550mV/µs at 500kHz) and an internal 5V LDO (VDD) derived from VIN. Its error amplifier provides 70dB gain and 5.5MHz open-loop bandwidth, supporting both internal compensation (COMP tied to AGND) and external network configurations.
Protection architecture includes high-side cycle-by-cycle current limit (6–9.5A), low-side forward/reverse overcurrent thresholds (8.6A / –3.3A), input UVLO (4.20–4.35V rising), input/output overvoltage lockout (19–20V VIN OVP), and thermal shutdown with 10°C hysteresis - all operating across –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports multi-cell Li-ion batteries and standard 5V/12V rails without external pre-regulation. |
| Output Current | 5A continuous - enables single-chip conversion for mid-power point-of-load applications like FPGA core supplies. |
| Switching Frequency | Fixed 500kHz - balances efficiency, size, and EMI; eliminates need for external sync clock or frequency tuning. |
| Feedback Reference | 0.800V ±1% - enables precise output voltage setting (e.g., 1.2V, 1.8V, 3.3V, 5V) using standard resistor dividers. |
| Soft-Start Control | Programmable via SS pin with 3.5µA internal current source - allows controlled inrush limiting by selecting external capacitor value. |
| Thermal Protection | 165°C shutdown with 10°C hysteresis - prevents permanent damage during overload or poor heatsinking conditions. |
| Package | 12-pin 3mm×4mm DFN with exposed thermal pad - achieves θJC = 3°C/W for high-power density PCB layouts. |
Pinout & Package
ISL85005AFRZ-TK uses a 12-pin 3mm×4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD) on underside for enhanced thermal performance. Pin numbering follows top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SS) | Soft-start timing input | 3.5µA internal current source charges external capacitor; sets startup ramp time - floating defaults to 2.3ms. |
| 2 (PG) | Open-drain power-good indicator | Asserts high after VOUT reaches 85% of target (±3% hysteresis); 1.5ms delay ensures stable regulation before system enable. |
| 3 (EN) | Enable control input | Active-high logic: device enabled when >0.6V (with 60–140mV hysteresis); pulls down PHASE via internal 10kΩ resistor when disabled. |
| 4 (FB) | Feedback node | Connects to resistor divider; regulates output to 0.8V reference - supports wide output range with <10nA leakage. |
| 5 (COMP) | Error amplifier output | Internal compensation selected by tying to AGND; external network between COMP and FB enables custom loop response. |
| 6 (AGND) | Analog ground reference | Return path for control circuitry; must be connected to PCB ground plane - internally tied to PGND but not interchangeable. |
| 7,8 (PHASE) | Switch node | Drives external inductor; connects to sources of internal high-side and low-side MOSFETs - requires low-inductance layout. |
| 9,10 (VIN) | Main power input | Accepts 4.5–18V; requires local ceramic decoupling to PGND - powers internal FETs and LDO. |
| 11 (VDD) | Internal LDO output | 5V regulated supply (4.3–5.5V) for analog/digital blocks; bypass with 1µF capacitor - tie to VIN if VIN is 3–5.5V. |
| 12 (BOOT) | Bootstrap supply | Connects 0.1µF capacitor to PHASE - provides gate drive voltage for high-side N-MOSFET above VIN rail. |
| (EPAD) | Power ground / thermal pad | Internally connected to PGND; must be soldered to large copper area with multiple vias for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/18V MOSFETs | Eliminates external switch selection and gate driver design; high-side RDS(ON) = 57–95mΩ, low-side = 40–75mΩ at 100mA. |
| Programmable soft-start | SS pin accepts external capacitor to set startup time - avoids input rail collapse and inductor saturation during power-up. |
| Integrated bootstrap diode | Reduces BOM count and improves reliability vs discrete bootstrap circuits; includes undervoltage detection to prevent shoot-through. |
| Comprehensive protection suite | Covers input UVLO/OVP, output OVP, high-side/low-side OCP (forward/reverse), and thermal shutdown - enables robust field operation. |
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting; internal slope compensation stabilizes operation at duty cycles >50%. |
Applications
| Industrial PLC I/O Module Power | Embedded Computing Core Supply |
|---|---|
Use Scenario: Providing clean, regulated 1.2V/1.8V for ARM Cortex-A/M series SoCs in fanless industrial controllers. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering up to 5A load current with tight output regulation and fast load-step response. Use Value: Fixed 500kHz operation simplifies EMI filtering; forced CCM ensures consistent ripple and predictable transient behavior under varying loads. |
Use Scenario: Generating 3.3V/5V rails for peripheral interfaces (USB, PCIe, SATA) in compact edge AI gateways. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V backplane to lower voltages with minimal board space. Use Value: 3mm×4mm DFN package with EPAD enables high-density layout; integrated MOSFETs reduce solution footprint by >40% vs controller+discrete-FET approach. |
| Battery-Powered Test Equipment | Network Switch ASIC Bias Supply |
Use Scenario: Powering mixed-signal measurement circuits in portable oscilloscopes and signal analyzers powered by 3S Li-ion packs (10.8–12.6V). IC Role / Device Role / Timing Role: Main step-down regulator accepting variable battery voltage and delivering stable 5V/3.3V outputs. Use Value: 4.5–18V input range accommodates full battery discharge curve; programmable soft-start prevents brownout during cold start. |
Use Scenario: Supplying 1.0V/1.2V core voltage to high-speed Ethernet switch ASICs requiring tight voltage tolerance and low noise. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating in forced CCM to maintain low output ripple at light-to-moderate loads. Use Value: ±1% 0.8V reference and current-mode control achieve <±15mV output deviation across line/load/temperature; PG signal synchronizes ASIC initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL85005FRZ-TK | Includes SYNC/MODE pin for external clock synchronization (300–2000kHz) and Diode Emulation Mode (DEM); lacks programmable soft-start. | Suitable where frequency coordination with system clock or light-load efficiency optimization is required. | Select ISL85005FRZ-TK if DEM mode or sync capability is needed; ISL85005AFRZ-TK is preferred for deterministic CCM timing and adjustable startup. |
| MPQ4572GQB-Z | Monolithic 5A buck with 3.3–36V input, 500kHz fixed frequency, and 0.8V reference - but no SS pin, only fixed 1.2ms soft-start. | Used in automotive infotainment and industrial HMIs where wider input range offsets lack of soft-start adjustability. | Choose MPQ4572GQB-Z for higher VIN tolerance (up to 36V); ISL85005AFRZ-TK offers superior startup control and thermal performance in 4.5–18V systems. |
Compared with ISL85005FRZ-TK and MPQ4572GQB-Z, the ISL85005AFRZ-TK uniquely combines programmable soft-start, forced CCM stability, and optimized thermal resistance (θJC = 3°C/W) - making it ideal for space-constrained, thermally sensitive embedded designs requiring precise power sequencing.
Availability
ISL85005AFRZ-TK is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded computing core supplies, battery-powered test equipment, and network switch ASIC bias supplies requiring stable component supply and long-term production support.
Supply support for ISL85005AFRZ-TK 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 delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and enterprise applications.
The ISL85005A belongs to Renesas' high-efficiency monolithic buck regulator product line, designed specifically for compact, thermally demanding point-of-load applications where integration, reliability, and ease of use are critical.
FAQ
What is the function of the SS pin on the ISL85005AFRZ-TK?
The SS (soft-start) pin on the ISL85005AFRZ-TK accepts an external capacitor to control startup ramp time. An internal 3.5µA current source charges the capacitor, linearly increasing the output voltage reference. With no capacitor, ISL85005AFRZ-TK defaults to a 2.3ms soft-start. This feature limits inrush current and prevents output overshoot during power-up sequences in sensitive systems.
Does the ISL85005AFRZ-TK support external frequency synchronization?
No, the ISL85005AFRZ-TK does not support external frequency synchronization. Unlike the ISL85005 variant, which uses pin 1 as SYNC/MODE, the ISL85005AFRZ-TK repurposes pin 1 as the SS pin and operates exclusively at a fixed 500kHz switching frequency. This simplifies design for applications where clock coordination is unnecessary and deterministic timing is preferred.
What is the maximum continuous output current rating of the ISL85005AFRZ-TK?
The ISL85005AFRZ-TK is rated for 5A continuous output current under recommended operating conditions (TJ ≤ +125°C, proper PCB thermal design). Its integrated high-side and low-side MOSFETs - with RDS(ON) values of 57–95mΩ and 40–75mΩ respectively - are thermally optimized for this load level in the 3mm×4mm DFN package with EPAD.
How does the ISL85005AFRZ-TK handle thermal overload conditions?
The ISL85005AFRZ-TK incorporates thermal shutdown protection that activates at +165°C junction temperature, with a 10°C hysteresis. When triggered, the device halts switching and holds the PHASE node low until temperature falls below +155°C, then automatically resumes operation. This safeguard prevents permanent damage during sustained overload or inadequate heatsinking in enclosed industrial environments.
Can the ISL85005AFRZ-TK operate in Diode Emulation Mode (DEM)?
No, the ISL85005AFRZ-TK operates exclusively in forced Continuous Conduction Mode (FCCM). DEM is available only on the ISL85005 variant (e.g., ISL85005FRZ-TK), which uses pin 1 as MODE control. The ISL85005AFRZ-TK's fixed FCCM operation ensures consistent ripple amplitude and predictable transient response across all load conditions - beneficial for noise-sensitive analog and RF subsystems.
ISL85005AFRZ-TK 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):
- 15V
- Current - Output:
- 5A
- 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)
ISL85005AFRZ-TK FAQ
1.How can I place an order for ISL85005AFRZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85005AFRZ-TK 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 ISL85005AFRZ-TK reliable?
The price and inventory of ISL85005AFRZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85005AFRZ-TK is usually 5 days.
3.What payment methods are accepted for ISL85005AFRZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85005AFRZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85005AFRZ-TK?
ISL85005AFRZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85005AFRZ-TK 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 ISL85005AFRZ-TK?
For technical support, including ISL85005AFRZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85005AFRZ-TK requirements.
6.How does Aetrix verify that ISL85005AFRZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL85005AFRZ-TK 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 ISL85005AFRZ-TK meets industry standards.
7.What is the process for return or replacement of ISL85005AFRZ-TK?
All ISL85005AFRZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL85005AFRZ-TK, 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 ISL85005AFRZ-TK part is unused and in its original packaging.
Return procedure for ISL85005AFRZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL85005AFRZ-TK 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…
