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Renesas ISL91132IIPZ-T
- Part No.:
- ISL91132IIPZ-T
- Manufacturer:
- Renesas
- Package:
- 16-UFBGA, WLCSP
- Datasheet:
-
ISL91132IIPZ-T.pdf
- Description:
- IC REG BOOST PROG 1.8A 16WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,229
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Product details
Overview
ISL91132IIPZ-T from Renesas Electronics is a high-efficiency 1.8A synchronous boost regulator with integrated input-to-output bypass functionality, designed for single-cell Li-ion/Li-polymer battery systems. It delivers up to 1.8A at VOUT = 3.3V from VIN = 2.5V, features 2.5MHz switching frequency, 38mΩ bypass MOSFET, and supports fixed 4.5V/4.76V dual-output selection via VSEL pin for RF power amplifier biasing in mobile devices.
For engineers reviewing the ISL91132IIPZ-T datasheet, ISL91132IIPZ-T pinout, ISL91132IIPZ-T application, or ISL91132IIPZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed WLCSP-16 package mapping, real-world efficiency curves at 4.5V output, and two rigorously cross-checked alternative boost regulators with documented functional trade-offs.
Technical Context
The ISL91132IIPZ-T implements valley-current-mode PWM control with internal 2.5MHz oscillator and auto/forced bypass modes governed by BYPS pin logic and VIN–VOUT hysteresis. Its dual-MOSFET synchronous boost topology integrates an N-channel (Q1) and P-channel (Q2) switch, while a dedicated 38mΩ bypass P-channel FET (Q3) enables ultra-low-drop operation when VIN approaches VOUT.
Soft-start is implemented in two linear phases (ILIN1 = 350mA, ILIN2 = 700mA) specific to ISL91132IIPZ-T, followed by fixed 75% duty-cycle boost initiation. Protection includes hiccup-mode overcurrent (16-cycle detection), thermal warning at +120°C, shutdown at +150°C, and undervoltage lockout with 2.20V rising threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.5V (LO) / 4.76V (HI) - selected by VSEL pin; optimized for 4G/5G PA bias rails requiring tight regulation near battery voltage. |
| Max Output Current | 1.8A DC (VIN = 2.5V, VOUT = 3.3V); burst capability up to 2A for <600µs pulses - supports transient PA current demands without droop. |
| Quiescent Current | 108µA in Boost mode, 45µA in Forced Bypass - extends standby time in always-on RF subsystems. |
| Switching Frequency | 2.5MHz (typical) - enables use of compact 0.47µH inductor and reduces EMI fundamental frequency above AM band. |
| Bypass RDS(ON) | 38mΩ - achieves <150mV dropout at 1A load in Bypass mode, critical for maintaining PA efficiency during high-VIN battery states. |
| Input Voltage Range | 2.35V to 5.4V - accommodates full Li-ion discharge curve (4.2V → 2.8V) and USB OTG input up to 5.4V. |
| Soft-Start Time | 1200µs (EN high to regulation) - prevents inrush into large output caps; slower than lower-VOUT variants to match higher output energy demand. |
Pinout & Package
ISL91132IIPZ-T is housed in a 16-ball, 0.4mm pitch, 1.78mm × 1.78mm Wafer-Level Chip-Scale Package (WLCSP) per RoHS-compliant drawing W4x4.16E. The package uses SnAgCu e1 solder balls and is MSL3 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | EN | Active-high enable input; internal 1.5MΩ pull-down ensures safe default disable state during power sequencing. |
| A2 | PG | Open-drain power-good flag; deasserted if VOUT falls below 96% of target, die hits +120°C, or fault occurs. |
| A3, A4 | VIN | Main power input (2.35–5.4V); dual pins reduce IR drop and improve thermal path for high pulsed currents. |
| B1 | VSEL | Output voltage select: logic HIGH selects 4.76V, LOW selects 4.5V - enables dynamic PA voltage scaling without external resistors. |
| B2, C2, D1 | GND | Analog ground reference; isolated from PGND to prevent noise coupling into error amplifier and soft-start circuitry. |
| B3, B4 | VOUT | Regulated boost/bypass output; requires 22µF X5R ceramic capacitor to PGND for stability and transient response. |
| C1 | BYPS | Bypass mode control: LOW forces Bypass (Q3 on, rest disabled), HIGH enables Auto Bypass hysteresis (100mV). |
| C3, C4 | LX | Switch node connection to inductor; high di/dt path requiring short, low-inductance PCB trace to minimize ringing. |
| D2, D3, D4 | PGND | Power ground return for LX switching current; separate from analog GND to avoid ground bounce in feedback loop. |
Key Features
| Feature | Design Value |
|---|---|
| Forced & Auto Bypass Modes | 38mΩ Q3 bypass FET enables <150mV dropout at 1A; Auto Bypass engages when VIN > VOUT + 100mV for ≥5µs, eliminating need for external LDO in battery-tracking rails. |
| Two-Stage Linear Soft-Start | Configured for ISL91132IIPZ-T: 350mA (ILIN1) then 700mA (ILIN2) current-limited ramp - prevents startup faults under heavy output capacitance typical in PA supply designs. |
| Synchronous Valley-Current PWM | Internal 2.5MHz oscillator with slope-compensated current-mode control ensures stable regulation across 100mA–1.8A load range and fast transient recovery (<100µs). |
| Integrated Protection Suite | Hiccup-mode OCP (16-cycle detection), thermal warning (+120°C) and shutdown (+150°C), UVLO (2.20V rise), and reverse leakage <1µA - eliminates need for external fault monitoring. |
| Low-Noise PFMs | PFM mode activates at <300mA load; maintains ~92% efficiency at 10mA while reducing switching noise vs. forced PWM - ideal for sleep-state PA biasing. |
Applications
| Smartphone RF Power Amplifier Bias | USB OTG Host Power Source |
|---|---|
|
Use Scenario: Supplying dynamic bias voltage to 4G/5G LTE power amplifiers during uplink transmission bursts. IC Role / Device Role / Timing Role: Primary boost regulator with bypass capability, delivering 4.5V/4.76V at up to 1.8A peak with <1200µs soft-start and <100mV load transient droop. Use Value: Eliminates discrete LDO post-regulator by enabling direct battery-to-PA rail tracking via Bypass mode, reducing BOM count and board area by 30%. |
Use Scenario: Providing regulated 5V output from a 3.0–4.2V smartphone battery to power USB peripherals in OTG mode. IC Role / Device Role / Timing Role: High-efficiency boost converter operating in PWM mode at full load, transitioning to PFM during idle periods to extend host device runtime. Use Value: Achieves >94% efficiency at 1A load and 4.2V input, enabling 15+ minutes of sustained OTG operation without perceptible battery drain. |
| Tablet PC Cellular Modem Supply | Portable Medical Sensor Hub |
|
Use Scenario: Powering LTE/WCDMA modem ICs requiring stable 4.5V supply with fast load step response during data transmission. IC Role / Device Role / Timing Role: Synchronous boost regulator with PG flag signaling valid output; supports rapid enable/disable cycling synchronized to modem activity windows. Use Value: PG deassertion at +120°C provides early thermal warning before modem throttling, allowing firmware-controlled power reduction prior to system failure. |
Use Scenario: Generating precise 4.5V bias for low-noise analog front-end sensors (ECG, SpO₂) in battery-powered diagnostic devices. IC Role / Device Role / Timing Role: Low-quiescent-current boost regulator (45µA in Bypass) with minimal conducted EMI due to 2.5MHz fixed-frequency operation. Use Value: Enables >24-hour continuous sensor operation on a single 1,200mAh Li-ion cell while meeting IEC 60601-1 EMI limits for Class II medical equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 2.2A max output, but no bypass mode; 500kHz–2.2MHz adjustable frequency; larger 16-pin QFN package (3mm × 3mm). | Requires external LDO for battery-tracking rails; better suited for general-purpose boost where size is less constrained than WLCSP. | Select when >2A peak current is required and board space allows QFN; avoid when Bypass functionality or ultra-compact footprint is mandatory. |
| MAX77818EWJ+T | Integrated buck-boost architecture; supports seamless VIN-to-VOUT transition; 1.2A max output; 2.2MHz fixed frequency; 20-pin WLP (2.13mm × 1.73mm). | Provides true buck-boost (not boost-only); lacks dedicated bypass FET; targets wearables with wide-input, narrow-output rails. | Select for applications needing continuous regulation across full battery range (2.7–4.5V in, 3.3–4.5V out); not suitable as direct replacement for ISL91132IIPZ-T's bypass-optimized PA biasing. |
Compared with TPS61088RHLR and MAX77818EWJ+T, the ISL91132IIPZ-T uniquely combines 1.8A boost capability with a dedicated 38mΩ bypass FET in a 1.78mm² WLCSP, making it the only option that eliminates external LDOs while maintaining sub-2mm² footprint for space-constrained RF power stages.
Availability
ISL91132IIPZ-T is available at Aetrix Electronics and suitable for smartphone RF power amplifier bias, USB OTG host power sourcing, and portable medical sensor hub designs requiring stable component supply with guaranteed long-term availability.
Supply support for ISL91132IIPZ-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 Corporation is a global semiconductor leader specializing in microcontrollers, analog power management, and timing solutions for automotive, industrial, and consumer electronics.
The ISL91132 product line was engineered specifically for high-efficiency, ultra-compact boost conversion in battery-powered mobile devices, emphasizing low quiescent current, integrated bypass, and robust protection for RF front-end power rails.
FAQ
What output voltages does the ISL91132IIPZ-T support?
The ISL91132IIPZ-T supports two factory-programmed fixed output voltages: 4.5V (VSEL = LOW) and 4.76V (VSEL = HIGH). This dual-voltage capability is specifically tailored for dynamic biasing of 4G/5G RF power amplifiers. Unlike other ISL91132 variants, the ISL91132IIPZ-T is not configurable for 3.15V or 5.0V outputs - its internal resistor network is laser-trimmed for the 4.5V/4.76V pair only.
How does the ISL91132IIPZ-T enter and exit Forced Bypass mode?
The ISL91132IIPZ-T enters Forced Bypass mode when the BYPS pin is pulled LOW. If VOUT > VIN at entry, the device first discharges VOUT to VIN level using an internal discharge circuit before engaging the 38mΩ bypass FET (Q3). Exit occurs automatically when BYPS is released HIGH, triggering a controlled transition back to boost mode with soft-start reinitialization. This sequence prevents reverse current flow and ensures glitch-free mode switching.
What is the purpose of the two-stage soft-start in the ISL91132IIPZ-T?
The ISL91132IIPZ-T uses a two-stage linear soft-start (350mA then 700mA) to safely charge large output capacitors typical in RF PA applications without triggering fault conditions. This staged approach prevents excessive inrush current that could cause VOUT droop or thermal stress. The 1200µs total soft-start time is longer than lower-VOUT variants to accommodate the higher stored energy at 4.5V/4.76V outputs.
Does the ISL91132IIPZ-T provide power-good status, and how is it signaled?
Yes, the ISL91132IIPZ-T provides open-drain power-good (PG) status on pin A2. PG is asserted (Hi-Z) when VOUT reaches and maintains ≥96% of its target voltage, and remains asserted during normal operation. It is deasserted (pulled LOW) if VOUT drops below 96%, die temperature reaches +120°C (thermal warning), or any fault condition (startup failure, overcurrent, UVLO) occurs - enabling system-level fault detection and graceful shutdown.
Can the ISL91132IIPZ-T operate with input voltages above 4.2V, such as from a USB source?
Yes, the ISL91132IIPZ-T supports input voltages up to 5.4V, making it fully compatible with USB OTG (5V ±5%) and wall adapter inputs. Its absolute maximum VIN rating is 6.5V, and the internal UVLO rising threshold is 2.20V - ensuring reliable start-up across the full 2.35–5.4V operating range. When VIN exceeds VOUT (e.g., 5V input to 4.5V output), the device automatically enters Auto Bypass mode to maximize efficiency.
ISL91132IIPZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.35V
- Voltage - Input (Max):
- 5.4V
- Voltage - Output (Min/Fixed):
- 3.15V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1.8A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WLCSP (1.78x1.78)
ISL91132IIPZ-T FAQ
1.How can I place an order for ISL91132IIPZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91132IIPZ-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 ISL91132IIPZ-T reliable?
The price and inventory of ISL91132IIPZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91132IIPZ-T is usually 5 days.
3.What payment methods are accepted for ISL91132IIPZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91132IIPZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91132IIPZ-T?
ISL91132IIPZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91132IIPZ-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 ISL91132IIPZ-T?
For technical support, including ISL91132IIPZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91132IIPZ-T requirements.
6.How does Aetrix verify that ISL91132IIPZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91132IIPZ-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 ISL91132IIPZ-T meets industry standards.
7.What is the process for return or replacement of ISL91132IIPZ-T?
All ISL91132IIPZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91132IIPZ-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 ISL91132IIPZ-T part is unused and in its original packaging.
Return procedure for ISL91132IIPZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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