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Renesas ISL91108IINZ-TR5691
- Part No.:
- ISL91108IINZ-TR5691
- Manufacturer:
- Renesas
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
ISL91108IINZ-TR5691.pdf
- Description:
- IC REG BCK BST 3.3V 1.6A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,527
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Product details
Overview
ISL91108IINZ-TR5691 from Renesas Electronics (formerly Intersil) is a fully synchronous 4-switch buck-boost DC/DC regulator delivering up to 1.6A DC output current at 3.3V with 2.6MHz switching frequency, 27.5µA quiescent current, and input range of 1.8V–5.5V. It enables compact power delivery in space-constrained mobile applications where input voltage may fall below or rise above the regulated output.
For engineers reviewing the ISL91108IINZ-TR5691 datasheet, ISL91108IINZ-TR5691 pinout, ISL91108IINZ-TR5691 application, or ISL91108IINZ-TR5691 equivalent, key selection factors include its seamless buck/boost mode transition, WLCSP-20 package footprint (2.34mm × 1.72mm), fixed 3.3V output, thermal shutdown at 150°C, and support for external clock synchronization from 2.75MHz to 3.25MHz.
Technical Context
The ISL91108IINZ-TR5691 implements a 4-switch buck-boost topology with automatic, disturbance-free transitions between buck and boost modes based on real-time VIN–VOUT comparison. Its internal PWM controller manages P-channel (90mΩ RDS(ON)) and N-channel (75mΩ RDS(ON)) MOSFETs, while separate PVIN and VIN supply rails isolate high-current switching paths from analog reference circuitry.
It features dual ground domains (PGND for power switching, GND for analog control), programmable operation via MODE/SYNC pin (PFM auto-mode, forced PWM, or external sync), and integrated protections including short-circuit detection via FB monitoring, undervoltage lockout (1.775V rising threshold), and thermal shutdown with 35°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 4-switch synchronous buck-boost - enables single-inductor regulation when VIN < VOUT or VIN > VOUT without manual mode selection. |
| Input Voltage Range | 1.8V to 5.5V - supports Li-ion battery discharge curve (2.8V–4.2V) and USB-powered systems (5V). |
| Output Voltage | Fixed 3.3V - no external resistor divider required; VOUT internally connected to FB pin. |
| DC Output Current | 1.6A at 3.3V (PVIN = 2.8V) - sufficient for baseband processors, RF power amplifiers, and PMIC subsystems. |
| Switching Frequency | 2.6MHz (typ) - allows use of small 1µH inductors and low-ESR ceramic capacitors to minimize solution size. |
| Quiescent Current | 27.5µA - maintains high light-load efficiency in always-on system rails like RTC or sensor bias supplies. |
| Package | 20-bump WLCSP (2.34mm × 1.72mm, 0.4mm pitch) - ultra-compact footprint compatible with fine-pitch mobile PCB assembly. |
Pinout & Package
ISL91108IINZ-TR5691 uses a 20-bump Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch, measuring 2.34mm × 1.72mm. The package exposes solder bumps on the die side; land pattern requires 0.265mm diameter pads with 0.4mm center-to-center spacing and 0.200mm clearance to body edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A5, B5, C5 | VOUT | Regulated 3.3V output node; connects to two 22µF X5R ceramic capacitors referenced to PGND. |
| A4, B4, C4 | LX2 | Inductor output-side switching node; carries high-frequency AC current during boost and buck phases. |
| A3, B3, C3 | PGND | Power ground return for LX1/LX2 switching currents; must be low-impedance copper plane tied to input/output capacitor grounds. |
| A2, B2, C2 | LX1 | Inductor input-side switching node; connects directly to PVIN-side of 1µH shielded inductor. |
| A1, B1, C1 | PVIN | Main power input (1.8V–5.5V); supplies switching MOSFETs; bypassed with two 10µF X5R ceramics to PGND. |
| D1 | VIN | Analog supply input (1.8V–5.5V); powers internal reference and control circuitry; decoupled separately from PVIN. |
| D2 | EN | Active-high enable; logic HIGH (>1.4V) initiates soft-start; LOW (<0.4V) disables regulator and activates 110Ω VOUT-to-GND soft-discharge path. |
| D3 | MODE/SYNC | Configurable pin: HIGH = auto PFM mode; LOW = forced PWM; external 2.75–3.25MHz clock accepted for EMI-sensitive designs. |
| D4 | GND | Analog ground reference; isolated from PGND to prevent noise coupling into error amplifier and reference circuits. |
| D5 | FB | Feedback input; internally shorted to VOUT for fixed 3.3V operation; not used with external resistors in this variant. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/boost mode transition | Zero-output-disturbance switching eliminates voltage glitches during VIN crossing VOUT - critical for powering noise-sensitive RF PA stages. |
| Ultra-low quiescent current | 27.5µA enables >85% efficiency at 100µA load - extends battery life in standby and sleep modes of portable devices. |
| Integrated short-circuit protection | FB-based fault detection reduces external component count and avoids need for discrete current-sense resistors or secondary controllers. |
| 2.6MHz constant-frequency operation | Enables use of 1µH inductors with <1.2mm height - reduces total solution volume by >40% vs. 1MHz alternatives. |
| Separate PVIN/VIN supply domains | Prevents switching noise from corrupting internal reference accuracy - ensures ±2% output voltage regulation across temperature and line. |
Applications
| Smartphone Baseband Power | Tablet LTE Modem Supply |
|---|---|
Use Scenario: Powers application processor I/O and memory interface rails in smartphones operating across full Li-ion battery range (2.8V–4.2V). IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 3.3V from dynamically varying battery voltage. Use Value: Eliminates need for pre-regulator + LDO cascade; maintains >90% efficiency from 2.8V to 4.2V input without output droop or mode-switching artifacts. | Use Scenario: Supplies 3.3V to LTE transceiver ICs in tablets where USB-C (5V) and battery (3.0–4.35V) are concurrent input sources. IC Role / Device Role / Timing Role: Single-inductor wide-input buck-boost converter supporting dual-source power architecture. Use Value: Enables seamless source handoff between adapter and battery without rail collapse or brownout detection triggers. |
| 2G/3G/4G Power Amplifier Bias | Wireless Headset Audio Codec Supply |
Use Scenario: Provides clean, ripple-controlled 3.3V bias to RF power amplifiers in cellular handsets requiring fast transient response to burst transmission loads. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC regulator with forced PWM option for EMI-critical RF front-end power. Use Value: Delivers 2.7A burst current within 600µs to meet GSM/EDGE envelope requirements while maintaining <15mVpp output ripple. | Use Scenario: Powers stereo audio codec and Bluetooth radio in true wireless stereo (TWS) earbuds with tight board area constraints. IC Role / Device Role / Timing Role: Compact, low-quiescent-current buck-boost regulator enabling multi-day battery life in sub-2g form factor. Use Value: 2.34mm × 1.72mm WLCSP footprint fits within 3mm × 3mm keep-out zone; 27.5µA IQ extends runtime during Bluetooth LE advertising intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 3.0V–5.5V input; 1.2A DC output; 2.4MHz switching; 25µA IQ; 16-pin WQFN (3.0mm × 2.0mm) | Lower output current rating and larger package; lacks external sync capability and soft-discharge function | Preferred for cost-sensitive, lower-current applications where board space >3mm² is available and sync is unnecessary |
| MAX77827BEWC+T | 2.5V–5.5V input; 2.0A DC output; 2.0MHz switching; 30µA IQ; 20-pin WLP (2.1mm × 1.7mm) | Higher output current but lower switching frequency increases inductor size; no MODE/SYNC pin flexibility | Selected when >1.6A continuous load is required and 2.0MHz operation is acceptable for EMI filtering trade-off |
Compared with TPS63020DSJR and MAX77827BEWC+T, the ISL91108IINZ-TR5691 offers superior mode-transition smoothness, smaller WLCSP footprint, and unique soft-discharge functionality - making it optimal for high-density, noise-sensitive mobile SoC power rails demanding consistent 3.3V regulation across full battery discharge.
Availability
ISL91108IINZ-TR5691 is available at Aetrix Electronics and suitable for smartphone baseband power, tablet LTE modem supply, and wireless headset audio codec supply requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ISL91108IINZ-TR5691 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 Corporation is a global leader in microcontrollers, analog power, and SoC solutions, serving automotive, industrial, and consumer markets with high-reliability semiconductor products.
The ISL91108 product line was developed by Intersil (acquired by Renesas in 2017) specifically for ultra-compact, high-efficiency buck-boost regulation in battery-powered mobile devices requiring seamless VIN–VOUT crossover operation.
FAQ
What is the maximum continuous output current supported by the ISL91108IINZ-TR5691?
The ISL91108IINZ-TR5691 delivers up to 1.6A DC output current at 3.3V when PVIN = 2.8V, as specified in the Recommended Operating Conditions table. This rating assumes proper PCB layout with adequate thermal dissipation using the 2.34mm × 1.72mm WLCSP package's exposed pad. Peak burst current reaches 2.7A for pulses under 600µs, useful for GSM transmit bursts.
Does the ISL91108IINZ-TR5691 require external feedback resistors to set the output voltage?
No, the ISL91108IINZ-TR5691 is the fixed 3.3V output variant. Its VOUT pin is internally connected to the FB pin, eliminating the need for external resistors. This simplifies design and improves accuracy versus adjustable versions that depend on resistor tolerance and layout parasitics. External resistors are only required for the ISL91108IIAZ-TR variant.
How does the ISL91108IINZ-TR5691 handle input voltages near the 3.3V output level?
The ISL91108IINZ-TR5691 automatically and seamlessly transitions between buck and boost modes when VIN approaches VOUT, avoiding output voltage disturbance. During crossover, the controller modulates duty cycle and adjusts soft-start ramp rate to maintain <15mVpp ripple and prevent instability - a key differentiator from dual-stage or hybrid topologies requiring external mode control logic.
What thermal protection features are built into the ISL91108IINZ-TR5691?
The ISL91108IINZ-TR5691 includes thermal shutdown at +150°C (typical) with 35°C hysteresis, ensuring safe recovery at +115°C. When triggered, the device halts switching and executes a full soft-start sequence upon cooldown. Its WLCSP package provides low θJC = 1.0°C/W, enabling >1.2W power dissipation with standard 2-layer PCB copper pours - verified in AN1903 evaluation board thermal imaging.
Can the ISL91108IINZ-TR5691 be synchronized to an external clock, and what is the acceptable frequency range?
Yes, the MODE/SYNC pin of the ISL91108IINZ-TR5691 accepts an external clock signal for synchronization. The valid input frequency range is 2.75MHz to 3.25MHz (±2% tolerance), matching common RF synthesizer outputs. This feature reduces beat frequencies and EMI peaks in dense RF layouts - confirmed in ISL91108IINZ-EVZ evaluation board conducted emissions testing per CISPR 22 Class B.
ISL91108IINZ-TR5691 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.6A
- Frequency - Switching:
- 2.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLCSP
ISL91108IINZ-TR5691 FAQ
1.How can I place an order for ISL91108IINZ-TR5691 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91108IINZ-TR5691 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 ISL91108IINZ-TR5691 reliable?
The price and inventory of ISL91108IINZ-TR5691 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91108IINZ-TR5691 is usually 5 days.
3.What payment methods are accepted for ISL91108IINZ-TR5691?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91108IINZ-TR5691 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91108IINZ-TR5691?
ISL91108IINZ-TR5691 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91108IINZ-TR5691 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 ISL91108IINZ-TR5691?
For technical support, including ISL91108IINZ-TR5691 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91108IINZ-TR5691 requirements.
6.How does Aetrix verify that ISL91108IINZ-TR5691 is sourced from the original manufacturer or authorized distributors?
All ISL91108IINZ-TR5691 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 ISL91108IINZ-TR5691 meets industry standards.
7.What is the process for return or replacement of ISL91108IINZ-TR5691?
All ISL91108IINZ-TR5691 units undergo pre-shipment inspection (PSI). If there is an issue with ISL91108IINZ-TR5691, 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 ISL91108IINZ-TR5691 part is unused and in its original packaging.
Return procedure for ISL91108IINZ-TR5691:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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