ISL91117IIAZ-T - 4.2A Sync Boost Converter WLCSP-20 | Renesas
Référence : ISL91117IIAZ-T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.62 | $0,62 |
| 10 | $0.56 | $5,60 |
| 100 | $0.49 | $49,00 |
| 500 | $0.42 | $210,00 |
| 1 000 | $0.36 | $360,00 |
ISL91117IIAZ-T Présentation
A synchronous boost converter is a switch-mode DC-DC converter that steps the input voltage up to a higher regulated output using an internal high-side MOSFET, an inductor, and a synchronous low-side MOSFET replacing the traditional diode. Within the broader power-management IC hierarchy, the boost converter belongs to step-up switching regulators, which sit alongside buck (step-down), buck-boost, and SEPIC converters. This category trades efficiency against the linear regulator's noise performance: switching converters achieve 90-95% efficiency versus 30-60% for low-dropout (LDO) regulators at large VIN/VOUT deltas, but inject ripple into the output that requires LC filtering. The ISL91117 family targets portable, single-cell Li-ion systems where battery life depends on minimizing quiescent current and maximizing converter efficiency.
The ISL91117IIAZ-T integrates two 4.2A N-channel MOSFETs in a synchronous configuration, supports output disconnect (true shutdown), and operates at a fixed switching frequency optimized for small external components. Internal compensation eliminates the need for external compensation networks. The 20-ball WLCSP occupies approximately 2.015 mm x 1.555 mm of board area, enabling ultra-compact portable designs. Protection features include overcurrent protection, over-temperature shutdown, and undervoltage lockout. The wide input range supports direct connection to single-cell Li-ion batteries without front-end regulation.
Typical applications include boosting a single-cell Li-ion battery (3.0-4.2V) to 5V USB-OTG rails in smartphones, powering 3.3V subsystems from 1.8V rails in wearable devices, and generating 5V supplies from dual-cell alkaline stacks in portable medical and industrial handheld instruments. The 4.2A switch rating also supports LED flash drivers, audio amplifiers, and other high-current loads requiring voltages above the battery.
When designing with the ISL91117IIAZ-T, the critical trade-off is efficiency versus noise: a switching regulator always adds ripple versus an LDO, so for noise-sensitive analog rails downstream LDO post-regulation may still be required. Use the smallest ceramic capacitors that meet the datasheet ESR/ESL guidance to minimize solution size and cost.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the Renesas datasheet, providing engineering context for selecting the ISL91117IIAZ-T versus competing boost converters.
Alternatives de remplacement direct pour ISL91117IIAZ-T — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ISL91117IIAZ-T (même facteur de forme et même empreinte) — différant par Battery Compatibility, Operating Temperature Range, Output Disconnect, Output Voltage Range.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ISL91117IIAZ-T7A
✅ Remplacement direct✓ En stock
$1.5 / unité
Voir la fiche technique →ISL91110IIAZ-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ISL91127IIAZ-T
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ISL91117IIAZ-T Valeurs maximales et caractéristiques électriques
| Topologie | Synchronous Boost (Step-Up) |
| Plage de tension d'entrée | 1.8 V to 4.8 V |
| Plage de tension de sortie | Adjustable, 0.8 V up to input voltage range |
| Switch Current Rating | 4.2 A |
| Output Current Capability | 1.5 A at PVIN=3.3V, VOUT=5V |
| Output Disconnect | Yes (true shutdown) |
| Redresseur synchrone | Yes (integrated low-side MOSFET) |
| Plage de température de fonctionnement | -40 C to +85 C (industrial) |
| Package Type | 20-ball WLCSP (UFBGA), 2.015 mm x 1.555 mm |
| Type de montage | Surface Mount |
| Battery Compatibility | Single-cell Li-ion/Li-poly, dual/triple-cell alkaline/NiMH/NiCd |
| Statut RoHS | Compliant |
| Protection Features | Overcurrent protection, over-temperature shutdown, undervoltage lockout |
Configuration des broches de ISL91117IIAZ-T
| Broche A1 | VIN — Battery input voltage (1.8V-4.8V) |
| Broche A2 | PGND — Power ground |
| Broche A3 | SW — Switch node (inductor connection) |
| Broche A4 | SW — Switch node (inductor connection) |
| Broche A5 | VOUT — Boost output voltage |
| Broche B1 | VIN — Battery input voltage |
| Broche B2 | PGND — Power ground |
| Broche B3 | SW — Switch node (inductor connection) |
| Broche B4 | VOUT — Boost output voltage |
| Broche B5 | VOUT — Boost output voltage |
| Broche C1 | AGND — Analog ground |
| Broche C2 | FB — Feedback voltage divider input |
| Broche C3 | EN — Enable (active high) |
| Broche C4 | AGND — Analog ground |
| Broche C5 | VOUT — Boost output voltage |
| Broche D1 | AGND — Analog ground |
| Broche D2 | AGND — Analog ground |
| Broche D3 | AGND — Analog ground |
| Broche D4 | VOUT — Boost output voltage |
| Broche D5 | VOUT — Boost output voltage |
Applications typiques
ISL91117IIAZ-T convient pour 7 applications: Smartphone USB-OTG 5V Power Rail, Wearable Device 3.3V Boost from 1.8V Coin Cell, Portable Medical Handheld Instrument Power Supply, Industrial IoT Sensor Node Power Conditioning, LED Flash Driver for Camera Phones, Audio Amplifier Supply Rail Boost, Backup Battery System Boost to 3.3V.
Smartphone USB-OTG 5V Power Rail
The ISL91117IIAZ-T's 1.8V to 4.8V input range directly accepts a single-cell Li-ion/Li-polymer battery (3.0-4.2V nominal), and its synchronous boost topology efficiently steps the battery voltage up to the USB-OTG-required 5.0V rail. At PVIN=3.3V and VOUT=5V, the device delivers 1.5A continuous output current - more than enough for USB-OTG peripheral charging at 500mA-1A. The integrated output-disconnect feature eliminates leakage current paths during shutdown, extending battery standby time. The 20-ball WLCSP at 2.015 mm x 1.555 mm fits beneath the SoC or PMIC, preserving precious smartphone PCB real estate.
Recommandé
Wearable Device 3.3V Boost from 1.8V Coin Cell
Wearable health monitors and smartwatches often use 1.8V coin-cell or thin-film batteries that cannot directly power 3.3V Bluetooth Low Energy (BLE) SoCs and sensor ICs. The ISL91117IIAZ-T accepts the 1.8V input and boosts it to a stable 3.3V output while drawing only microamps of quiescent current during light loads. The 4.2A switch current rating comfortably supports peak load transients from BLE radio transmissions (typically 30-50mA) and sensor sampling bursts (5-20mA). The synchronous rectifier and true shutdown minimize idle battery drain, critical for multi-week wearable battery life.
Recommandé
Portable Medical Handheld Instrument Power Supply
Handheld medical devices such as glucose meters, pulse oximeters, and infusion pumps run from dual-cell alkaline (3V) or single-cell Li-ion (3.7V) batteries but need a regulated 5V rail to power displays, op-amps, and isolated communication interfaces. The ISL91117IIAZ-T boosts the battery to 5V with 1.5A capability, enough to drive an LCD backlight, audio beeper, and microcontroller simultaneously. The integrated over-temperature and over-current protection features meet IEC 60601 medical safety design expectations. Renesas' long-term reliability track record and the WLCSP-20 miniaturization enable pocket-sized medical form factors.
Recommandé
Industrial IoT Sensor Node Power Conditioning
Industrial IoT (IIoT) sensor nodes frequently operate from 3.6V lithium-thionyl-chloride (Li-SOCl2) primary batteries that sag under load and cannot directly power 3.3V wireless MCUs. The ISL91117IIAZ-T boosts the variable battery voltage (2.5V-3.6V) to a regulated 3.3V output, supporting continuous sensor operation even as the battery discharges. The 4.2A switch rating accommodates transmit bursts from LoRa, Sigfox, or Wireless MBus radios that can pull 100-300mA during transmission. The 20-ball WLCSP and minimal external component count keep the sensor node BOM small for high-volume industrial deployments.
Recommandé
LED Flash Driver for Camera Phones
Modern smartphone camera flashes require brief high-current pulses (up to 1-2A) to drive high-brightness white LEDs from a single-cell Li-ion battery. The ISL91117IIAZ-T's 4.2A switch current and 1.5A continuous output capability make it suitable for driving LED flash circuits when boosted above the battery voltage. The synchronous topology minimizes thermal dissipation during the brief flash pulse, and the WLCSP package keeps the boost inductor and capacitor loop compact for clean switching. This is a niche but well-documented application in portable-camera product designs.
Recommandé
Audio Amplifier Supply Rail Boost
Portable audio devices (Bluetooth speakers, headphone amplifiers) often use a single-cell Li-ion battery but need a higher voltage (typically 5V-9V) to drive Class-D or Class-AB audio amplifiers for louder output. The ISL91117IIAZ-T boosts the 3.7V battery to a 5V or 7V rail, providing headroom for amplifier power output. The synchronous rectification delivers 90-95% efficiency, extending playback time. The WLCSP-20 package fits alongside the audio codec in space-constrained portable speaker designs.
Recommandé
Backup Battery System Boost to 3.3V
Uninterruptible power supplies (UPS) and memory backup systems often use supercapacitor or thin-film batteries that sag from 3.0V to 2.0V during discharge. The ISL91117IIAZ-T boosts the variable backup-battery voltage to a stable 3.3V output, ensuring RTC circuits, SRAM, and monitoring ICs continue operating during main-power outages. The 1.8V minimum input covers deep-discharge supercapacitor scenarios. The integrated output disconnect prevents reverse current flow back into the battery, preserving backup charge for critical power-loss events.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ISL91117IIAZ-T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ISL91117IIAZ-T7A | ISL91110IIAZ-T | ISL91127IIAZ-T |
|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 20-ball WLCSP (2.015 mm x 1.555 mm) | 20-ball WLCSP - same | 20-ball WLCSP - same | 20-ball WLCSP - same |
| Topology | Synchronous Boost | Synchronous Boost | Synchronous Boost | Synchronous Boost |
| Switch Current Rating | 4.2 A | 4.2 A | ~2 A | ~3 A |
| Reel Quantity | 3000 (T-suffix) | 250 (T7A-suffix) | 3000 (T-suffix) | 3000 (T-suffix) |
Principaux différenciateurs
- 4.2A switch current rating in WLCSP-20 (vs ISL91110IIAZ-T)
- True output-disconnect in shutdown (vs ISL91110IIAZ-T)
- Synchronous rectification for higher efficiency (vs Non-synchronous boost alternatives (e.g. TL2575-05IKV))
- Wide 1.8V-4.8V input range for single Li-ion (vs Buck-only alternatives (e.g. TPS61236 in buck mode))
Notes de conception
WLCSP-20 layout requires careful PCB design: keep all bypass and decoupling capacitors within 2 mm of their respective balls. Use a 4-layer PCB with a dedicated ground plane beneath the IC to minimize the high-current switching loop area. The SW node traces must be short and wide (>= 0.5 mm) to reduce parasitic inductance that causes voltage spikes and EMI. Estimated: with 2 mm x 0.3 mm SW traces at 4.2A, expect approximately 10-15 nH of parasitic inductance per trace.
Although the WLCSP package is small, the ISL91117IIAZ-T can dissipate 0.5-1.5W in typical battery-to-5V boost operation. The thermal pad and ground balls carry heat to the PCB; ensure at least 50 mm^2 of copper pour on the top layer connected to PGND and AGND balls for heat spreading. For continuous 1.5A output operation, additional PCB thermal relief or airflow may be required to keep junction temperature below 125C. Estimated: at 1.5A output with 3.3V input to 5V boost, power dissipation is approximately 1.05W (assuming 90% efficiency).
Common ISL91117 design pitfalls include: (1) using an inductor with insufficient saturation current - select >= 5A saturation to handle 4.2A switch transients; (2) omitting the input bypass capacitor - always place >= 10uF ceramic directly at VIN; (3) leaving EN floating - tie EN to VIN through a 100k resistor for default-on operation; (4) ignoring output-disconnect behavior - if your circuit requires the output to remain energized in shutdown, add an external Schottky diode; (5) exceeding absolute maximum VIN of 5.5V during transients. (Source: Renesas ISL91117 datasheet application notes.)
The WLCSP-20 ball map requires exact land pattern matching - refer to the Renesas ISL91117 datasheet land pattern appendix for ball pitch (typically 0.4 mm) and pad diameter recommendations. The SW node balls must connect to the inductor with the shortest possible trace to minimize EMI. Place the input capacitor return via directly to the nearest PGND ball, not to a remote ground point, to keep the high-current loop compact and reduce conducted noise.
Informations de conformité
RoHS and REACH compliance per Renesas product page. AEC-Q100 not qualified - this part targets commercial/industrial portable applications, not automotive. Lead-free reflow compatible per JEDEC J-STD-020.
