My Inquiry
My Account
Renesas ISL6273IRZ
- Part No.:
- ISL6273IRZ
- Manufacturer:
- Renesas
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
ISL6273IRZ.pdf
- Description:
- IC REG BUCK ADJ 1.2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,831
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL6273IRZ from Intersil is a 1.2A, 1.5MHz synchronous buck regulator optimized for low-voltage microprocessor core power in compact battery-powered devices. It delivers regulated output down to 0.8V from a 2.7V–5.5V input, features internal P/N-channel MOSFETs (RDS(on) ≤ 0.27Ω), 25µA quiescent current in IQ mode, and 100% duty-cycle operation for <200mV dropout at 1.2A - enabling single Li⁺ cell operation in PDAs and cellular handsets.
For engineers reviewing the ISL6273IRZ datasheet, ISL6273IRZ pinout, ISL6273IRZ application, or ISL6273IRZ equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency and regulation specs, and two field-validated alternative parts with documented functional and application differences.
Technical Context
The ISL6273IRZ employs current-mode PWM control with internal slope compensation and a 0.4V/A current-sense gain for fast transient response and pulse-by-pulse overcurrent limiting. Its dual-mode operation-selectable forced PWM or low-IQ skip mode-enables stable 1.5MHz switching under load and dynamic frequency reduction at light load to sustain >95% peak efficiency and extend battery life.
It integrates a 200ms POR timer with RSI reset capability, digital soft-start, internal loop compensation, and full protection including thermal shutdown (150°C), overcurrent (2.1A peak), and short-circuit detection via FB voltage monitoring (<0.2V). The 10-lead 3×3mm DFN package uses separate PGND/SGND pins and requires exposed pad connection to PGND for thermal and electrical integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.2A guaranteed minimum - supports DSP core and microprocessor loads without external current boosting. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single Li⁺, three NiMH, or regulated 5V rails; enables direct battery connection. |
| Quiescent Current | 25µA in IQ mode - minimizes standby power loss in portable systems during idle or sleep states. |
| Switching Frequency | 1.5MHz nominal (1.35–1.75MHz) - permits use of small 1.8µH inductors and 10µF ceramic capacitors, reducing solution footprint to <1 cm². |
| Feedback Accuracy | ±3% over temperature/load/line - ensures stable core voltage regulation across operating conditions for reliable processor operation. |
| Duty Cycle | 100% maximum - achieves <200mV dropout at 1.2A, extending usable battery range down to ~2.9V for Li⁺ cells. |
| Package | 10-lead 3×3mm DFN (L10.3x3C), 1mm max height - surface-mount, RoHS-compliant, with exposed thermal pad tied to PGND. |
Pinout & Package
ISL6273IRZ is housed in a 10-lead 3×3mm DFN package (pkg drawing L10.3x3C) with an exposed thermal pad that must be soldered to PGND for thermal performance and electrical stability. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN | Main power input | Accepts 2.7–5.5V supply; requires 10µF ceramic bypass to PGND to suppress switching noise and stabilize input rail. |
| VCC | Internal bias supply | Derived from PVIN via internal 10Ω resistor; requires 0.1µF ceramic bypass to SGND for analog/digital circuit stability. |
| EN | Enable control | Logic-high enables regulation; logic-low disables and actively discharges output capacitor - supports safe power sequencing. |
| POR | Power-on reset output | Open-drain 200ms delayed signal indicating valid output voltage; resettable by RSI - interfaces directly with µP reset inputs. |
| MODE | Operation mode select | High = low-IQ skip mode; low = forced PWM - determines light-load efficiency vs. output ripple trade-off. |
| PHASE | Switch node | Connects to inductor; carries high di/dt switching current - must be routed with minimal loop area to reduce EMI. |
| PGND | Power ground return | Low-impedance return path for MOSFETs and inductor; connects to exposed pad - separates high-current paths from analog ground. |
| SGND | Analog ground reference | Reference for FB, error amplifier, and control logic; must connect to PGND at single point near load to avoid noise coupling. |
| FB | Output voltage feedback | Senses regulated output via resistor divider (adjustable) or direct connection (fixed); 0.8V reference enables 0.8–3.6V output range. |
| RSI | Reset inhibit input | Active-low signal that resets POR timer - allows system-level control of power-good assertion timing during boot or fault recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-MOSFETs | 0.12–0.27Ω RDS(on) (P/N) at 2.7–3.6V - eliminates external switches, reduces BOM count, and improves efficiency over discrete solutions. |
| 100% Duty-Cycle Operation | Enables <200mV dropout at 1.2A - maximizes usable battery voltage range and extends runtime in Li⁺-powered applications. |
| 200ms Programmable POR | Guaranteed delay with RSI reset - provides deterministic microprocessor reset timing independent of input ramp rate or load transients. |
| Internal Digital Soft-Start | 1.1ms controlled ramp - prevents inrush current, avoids input rail collapse, and eliminates need for external soft-start components. |
| Thermal Shutdown + Hysteresis | 150°C trip / 130°C recovery - protects against sustained overload or poor PCB thermal design while enabling automatic recovery. |
| Peak Current Limiting | 2.1A typical limit - provides robust short-circuit and overload protection without requiring external sense resistors or comparators. |
Applications
| Mobile Handset Core Power | DSP Baseband Supply |
|---|---|
Use Scenario: Powers ARM-based application processors and baseband ICs in GSM/UMTS smartphones using single Li⁺ battery input. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.2V/1.2A core voltage with tight regulation and fast load transient response. Use Value: 25µA IQ mode extends standby time; 100% duty cycle sustains operation down to 2.9V battery voltage; 1.5MHz switching enables ultra-compact layout. |
Use Scenario: Supplies 1.6V/1.2A to digital signal processors in portable audio/video decoders and modems. IC Role / Device Role / Timing Role: High-efficiency step-down converter with integrated MOSFETs and internal compensation - simplifies power design for space-constrained modules. Use Value: ±3% output accuracy ensures DSP timing margin compliance; 200ms POR synchronizes with system boot sequence; RSI enables coordinated reset with companion ICs. |
| PDA System-on-Chip Rail | Palmtop Microcontroller Core |
Use Scenario: Generates 2.5V/1.2A for SoC I/O and memory interface in handheld PDAs with limited PCB area. IC Role / Device Role / Timing Role: Fixed-output buck regulator with integrated soft-start and discharge function - manages power-up sequencing and safe shutdown. Use Value: 10-lead DFN package occupies <1 cm²; EN-controlled output discharge prevents floating bus states; forced PWM mode eliminates audible noise during active use. |
Use Scenario: Delivers 0.8V–1.8V adjustable core voltage to low-power microcontrollers in medical and industrial palmtops. IC Role / Device Role / Timing Role: Adjustable synchronous buck with precision 0.8V reference and resistor-programmable output - supports multiple voltage domains from one BOM. Use Value: FB pin leakage ≤0.1µA preserves accuracy with high-value dividers; internal compensation eliminates external compensation network; MODE pin enables firmware-controlled efficiency mode selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL9106 | Lower 0.8A output current; 3MHz switching; smaller 1.6×1.6mm DFN; no RSI or POR pins. | Targeted at ultra-low-power wearables and sensors - lacks power sequencing support and reset signaling required for microprocessor systems. | Select ISL9106 only when output current ≤0.8A and POR/RSI functionality is unnecessary; not suitable for ISL6273IRZ's 1.2A microprocessor core role. |
| RT8059GJ6 | 1.5A output; 2MHz switching; integrated 0.12Ω/0.1Ω MOSFETs; no MODE pin or skip mode; fixed 1.2V output only. | Designed for cost-sensitive consumer electronics - lacks adjustable output and dual-mode operation, limiting flexibility in multi-rail designs. | Choose RT8059GJ6 for fixed 1.2V/1.5A applications where board space is critical and light-load efficiency is secondary to BOM cost. |
Compared with ISL9106 and RT8059GJ6, the ISL6273IRZ uniquely combines 1.2A output, selectable PWM/IQ modes, 200ms RSI-resettable POR, and 0.8V–3.6V adjustability - making it the only option among the three qualified for battery-powered microprocessor core supplies requiring both high efficiency and precise power sequencing.
Availability
ISL6273IRZ is available at Aetrix Electronics and suitable for mobile handset core power, DSP baseband supply, and PDA SoC rail applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for ISL6273IRZ 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
Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-performance DC-DC converters, precision amplifiers, and interface solutions targeting portable and industrial markets.
The ISL6273IRZ belongs to Intersil's low-quiescent-current synchronous buck regulator product line, engineered specifically for battery-powered handheld devices requiring high efficiency across wide load ranges and robust power sequencing capabilities.
FAQ
What is the maximum output current capability of the ISL6273IRZ?
The ISL6273IRZ guarantees a minimum output current of 1.2A across its full operating temperature and input voltage range. This rating is validated under worst-case conditions (–40°C to +85°C ambient, 2.7V–5.5V input) with proper thermal design - including connection of the exposed pad to PGND and adequate PCB copper area. Peak current limit is 2.1A, providing headroom for transient loads.
Does the ISL6273IRZ support adjustable output voltage?
Yes, the ISL6273IRZ supports adjustable output voltage via the FB pin. When used in adjustable configuration (ISL6273-ADJ variant), the output is set using an external resistor divider referenced to the internal 0.8V bandgap. The formula is VOUT = 0.8V × (1 + R2/R3), with R3 ≤ 200kΩ recommended to minimize FB leakage-induced error. Fixed-output versions (e.g., ISL6273-25) tie FB directly to output.
How does the MODE pin affect ISL6273IRZ operation?
The MODE pin selects between two distinct operating modes: logic-high (or VCC) enables low-IQ skip mode for highest light-load efficiency, while logic-low (or GND) forces continuous PWM operation to maintain constant switching frequency and lower output ripple. Leaving MODE unconnected is not allowed - it must be actively pulled high or low per application requirements.
What is the purpose of the RSI pin on the ISL6273IRZ?
The RSI (Reset Inhibit) pin provides external control over the 200ms POR timer. Driving RSI low resets the POR counter and holds POR output low regardless of output voltage status. A rising edge on RSI restarts the 200ms delay once the FB voltage enters the valid window (0.736V–0.864V). This enables synchronized system reset timing across multiple power rails or after fault recovery.
Can the ISL6273IRZ operate from a single Li⁺ cell?
Yes, the ISL6273IRZ is explicitly designed for single Li⁺ cell operation. Its 2.7V–5.5V input range covers the full discharge curve of a Li⁺ cell (4.2V down to ~2.8V), and its 100% duty-cycle capability ensures regulation remains active until PVIN drops below ~2.9V - maximizing usable battery capacity and runtime in handheld devices.
ISL6273IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
ISL6273IRZ FAQ
1.How can I place an order for ISL6273IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6273IRZ 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 ISL6273IRZ reliable?
The price and inventory of ISL6273IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6273IRZ is usually 5 days.
3.What payment methods are accepted for ISL6273IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6273IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6273IRZ?
ISL6273IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6273IRZ 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 ISL6273IRZ?
For technical support, including ISL6273IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6273IRZ requirements.
6.How does Aetrix verify that ISL6273IRZ is sourced from the original manufacturer or authorized distributors?
All ISL6273IRZ 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 ISL6273IRZ meets industry standards.
7.What is the process for return or replacement of ISL6273IRZ?
All ISL6273IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6273IRZ, 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 ISL6273IRZ part is unused and in its original packaging.
Return procedure for ISL6273IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL6273IRZ 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…
