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Renesas ISL9104IRUBZ-T7A
- Part No.:
- ISL9104IRUBZ-T7A
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104IRUBZ-T7A.pdf
- Description:
- IC REG BUCK 1.5V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,482
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Product details
Overview
ISL9104IRUBZ-T7A from Intersil is a 500mA, 4.3MHz synchronous buck converter optimized for low-voltage microprocessors in space-constrained portable devices. It delivers fixed 1.5V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrated P/N-channel MOSFETs. It powers core logic in WCDMA handsets and MP3 players.
For engineers reviewing the ISL9104IRUBZ-T7A datasheet, ISL9104IRUBZ-T7A pinout, ISL9104IRUBZ-T7A application, or ISL9104IRUBZ-T7A equivalent, key selection criteria include light-load efficiency (20µA IQ), ultrasonic skip-mode noise suppression (not applicable to ISL9104 variant), fixed 1.5V output accuracy (±3%), thermal shutdown (130°C), and µTDFN-6 package compatibility with high-density PCB layouts.
Technical Context
The ISL9104IRUBZ-T7A uses peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its 4.3MHz fixed-frequency operation under heavy load enables compact 1.0µH inductors and 4.7µF ceramic capacitors.
Under light load, it automatically enters skip mode (PFM) triggered by 16-consecutive zero-crossing detections at the SW node; regulation relies on the 0.8V internal bandgap reference and FB pin feedback. The device integrates digital soft-start, logic-controlled enable, and a dedicated N-channel bleeding FET for rapid output capacitor discharge during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% over line, load, and temperature - ensures stable core supply for 1.5V I/O domains without external resistor divider. |
| Max Output Current | 500mA guaranteed minimum - supports baseband processors and RF transceivers in cellular handsets. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li+ cell (2.7–4.2V), three NiMH cells, or regulated 5V rails. |
| Switching Frequency | 4.3MHz (3.6–4.9MHz range) - enables use of sub-2mm footprint inductors and minimizes PCB area. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby and low-activity states. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, sustaining regulation as input voltage drops near VOUT. |
| Shutdown Current | 0.05µA typical - eliminates parasitic drain during system sleep or power-off modes. |
| Thermal Shutdown | 130°C threshold with 30°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
ISL9104IRUBZ-T7A is housed in a RoHS-compliant 1.6mm × 1.6mm µTDFN-6 package with wettable flanks, optimized for automated optical inspection and thermal performance (θJA = 160°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input power supply | Accepts 2.7–6.0V; requires local 4.7µF ceramic decoupling to minimize switching noise injection into source rail. |
| EN (Pin 2) | Enable control input | Active-high logic interface; pulls low to disable regulator and activate internal output capacitor bleed path. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating - no external tie required or recommended. |
| SW (Pin 4) | Switching node | Connects to inductor high-side; carries high di/dt pulses - requires short, wide trace routing to minimize EMI. |
| GND (Pin 5) | Power ground | Primary return path for input/output currents; must be tied to solid ground plane beneath IC footprint. |
| FB (Pin 6) | Feedback input | Internally connected to 0.8V reference for fixed 1.5V output; no external resistors needed - direct connection to output. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-MOSFETs | P-channel RDS(on) = 0.45Ω / N-channel RDS(on) = 0.4Ω @ 3.6V - eliminates external power switches and reduces BOM count by two active components. |
| Digital Soft-Start | 1.0ms controlled ramp - prevents inrush current and output overshoot during power-up sequencing in multi-rail systems. |
| Output Bleed Function | Internal N-MOSFET discharges output capacitor when EN = LOW - avoids residual voltage hold-up that could disrupt downstream logic reset timing. |
| Peak Current Limit Protection | 1.0A typical limit (0.75–1.35A range) - provides cycle-by-cycle overcurrent protection without external sensing resistors. |
| Ultrasonic Skip Mode | Not implemented - ISL9104IRUBZ-T7A is ISL9104 (non-A) variant; audible noise may occur below ~20kHz during light-load operation. |
| Over-Temperature Protection | 130°C shutdown with 30°C hysteresis - ensures safe recovery after thermal stress without requiring external thermal monitoring circuitry. |
Applications
| Mobile Handset Power Management | Portable Audio Device Core Supply |
|---|---|
|
Use Scenario: Powering baseband processor cores and memory interfaces in WCDMA/UMTS handsets operating from single Li-ion cells. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.5V at up to 500mA with dynamic load response to burst-mode processing demands. Use Value: 93% peak efficiency and 20µA skip-mode IQ extend talk-time by >12% versus comparable 3MHz converters in real-world usage profiles. |
Use Scenario: Supplying DSP and codec subsystems in battery-powered MP3 players and Bluetooth headsets. IC Role / Device Role / Timing Role: Fixed-output buck converter enabling clean, low-noise 1.5V rail independent of battery voltage sag during playback. Use Value: 100% duty-cycle operation maintains regulation down to VIN = 1.8V, preventing brownout resets during deep discharge cycles. |
| PDAs and Palmtop System Rail | Low-Power Industrial Sensor Node |
|
Use Scenario: Generating main logic voltage for ARM-based PDAs with tight board area constraints and aggressive thermal budgets. IC Role / Device Role / Timing Role: Compact, integrated DC/DC solution replacing discrete buck controllers + external MOSFETs in legacy designs. Use Value: 1.6×1.6mm µTDFN package and minimal external parts (1×1.0µH inductor, 2×4.7µF caps) reduce total solution footprint to <0.5cm². |
Use Scenario: Powering ultra-low-power microcontrollers and analog front-ends in wireless sensor nodes powered by coin-cell or energy-harvesting sources. IC Role / Device Role / Timing Role: High-efficiency regulator supporting intermittent wake-up cycles with sub-1µA shutdown current and fast enable response. Use Value: 0.05µA shutdown current and rapid soft-start (<1ms) minimize energy loss during sleep-to-active transitions in duty-cycled operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL9104AIRUBZ-T | Includes ultrasonic skip mode (25kHz+); otherwise identical pinout, specs, and 1.5V fixed output. | Required where audible switching noise must be avoided (e.g., hearing aids, voice recorders). | Select ISL9104AIRUBZ-T only if ultrasonic operation is mandatory; ISL9104IRUBZ-T7A offers same efficiency and footprint without added cost. |
| TPS62231DRYR | 3MHz switching frequency, 300mA rating, 1.5V fixed output, 17µA IQ in PFM mode; 1.2×1.2mm DSBGA-6 package. | Better suited for sub-300mA loads and ultra-thin form factors; lacks 100% duty-cycle low-dropout capability. | Choose TPS62231DRYR for space-constrained designs with lighter loads; ISL9104IRUBZ-T7A preferred for 500mA demand and Li+-cell dropout margin. |
Compared with ISL9104AIRUBZ-T, ISL9104IRUBZ-T7A trades ultrasonic noise suppression for lower cost and identical efficiency in non-audio-critical applications; versus TPS62231DRYR, it delivers 67% higher output current and superior dropout performance at the expense of slightly larger footprint and higher IQ.
Availability
ISL9104IRUBZ-T7A is available at Aetrix Electronics and suitable for mobile handset power management, portable audio device core supply, PDA system rails, and low-power industrial sensor nodes requiring stable component supply across long production lifecycles.
Supply support for ISL9104IRUBZ-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
Intersil Corporation is a leader in high-performance analog semiconductors, specializing in power management and signal processing solutions for portable and communications markets.
The ISL9104 family was designed specifically for space-constrained, battery-powered handheld devices requiring high efficiency at light loads and robust transient response under dynamic processor workloads.
FAQ
What is the output voltage tolerance of the ISL9104IRUBZ-T7A over temperature and line variations?
The ISL9104IRUBZ-T7A provides ±3% output voltage accuracy across the full operating temperature range (-40°C to +85°C) and input voltage range (2.7V to 6.0V). This specification applies specifically to its fixed 1.5V output version and is guaranteed by internal trimming during production test - no external calibration is required for compliance.
Does the ISL9104IRUBZ-T7A support 100% duty-cycle operation, and what is the practical dropout voltage at full load?
Yes, the ISL9104IRUBZ-T7A supports 100% duty-cycle operation to maintain regulation as input voltage approaches output voltage. At 500mA load, the dropout voltage is less than 300mV - calculated as IOUT × RP-CH RDS(on), where typical P-channel ON-resistance is 0.45Ω at 3.6V input, yielding ~225mV drop.
How does the ISL9104IRUBZ-T7A manage light-load efficiency, and what is its quiescent current in skip mode?
The ISL9104IRUBZ-T7A automatically enters skip mode (PFM) under light load to minimize switching losses. Its typical quiescent supply current in this mode is 20µA at 6.0V input with no output load - directly extending battery life in standby and idle states without sacrificing regulation accuracy.
What protection features are integrated into the ISL9104IRUBZ-T7A, and how do they operate?
The ISL9104IRUBZ-T7A integrates overcurrent protection (OCP) via peak-current limiting (0.75–1.35A), thermal shutdown (130°C with 30°C hysteresis), undervoltage lockout (UVLO at 2.5–2.7V), and short-circuit protection (SCP) that reduces switching frequency during output faults. All functions operate autonomously without external components.
Is an external feedback resistor divider required for the ISL9104IRUBZ-T7A, and how is the 1.5V output set?
No external resistor divider is required. The ISL9104IRUBZ-T7A is a fixed 1.5V output variant - its FB pin is internally connected to the 0.8V reference and the output voltage is trimmed at wafer sort. The FB pin must be directly connected to the output node per the datasheet; adding external resistors will disrupt regulation.
ISL9104IRUBZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 4.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UTDFN (1.6x1.6)
ISL9104IRUBZ-T7A FAQ
1.How can I place an order for ISL9104IRUBZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104IRUBZ-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 ISL9104IRUBZ-T7A reliable?
The price and inventory of ISL9104IRUBZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104IRUBZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9104IRUBZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104IRUBZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104IRUBZ-T7A?
ISL9104IRUBZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104IRUBZ-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 ISL9104IRUBZ-T7A?
For technical support, including ISL9104IRUBZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104IRUBZ-T7A requirements.
6.How does Aetrix verify that ISL9104IRUBZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9104IRUBZ-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 ISL9104IRUBZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9104IRUBZ-T7A?
All ISL9104IRUBZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104IRUBZ-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 ISL9104IRUBZ-T7A part is unused and in its original packaging.
Return procedure for ISL9104IRUBZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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