ISL91117IIAZ-T7A - 3.7A Sync Boost Converter, 1.8-4.8V | Renesas
N.º da peça: ISL91117IIAZ-T7A ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.08 | $3,08 |
| 10 | $2.78 | $27,80 |
| 100 | $2.45 | $245,00 |
| 500 | $2.18 | $1.090,00 |
| 1.000 | $1.95 | $1.950,00 |
| 3.000 | $1.5 | $4.500,00 |
ISL91117IIAZ-T7A Visão geral
A boost converter (step-up DC-DC switching regulator) accepts an input voltage lower than the desired output voltage and uses a switching inductor, peak-current-mode controller, and synchronous rectifier to efficiently generate higher output voltages. Boost regulators sit within the broader hierarchy of switching regulators -> DC-DC converters -> power management ICs -> power management semiconductors. They are essential when downstream analog, RF, or MCU rails require 3.3V, 5V, or higher from a single-cell Li-ion/alkaline source.
Key features include 95% peak efficiency, internal 4.2A low-Rdson MOSFET switches, output disconnect during shutdown, programmable PFM/PWM operation for light-load efficiency, and an operating junction temperature range of -40C to +85C. The wide VIN range supports dual/triple-cell alkaline, NiCd/NiMH, and single-cell Li-ion/Li-polymer battery packs.
The ISL91117IIAZ-T7A uses a peak-current-mode architecture with internal compensation and synchronous rectification to maximize efficiency across the entire load range. The output disconnect MOSFET eliminates leakage paths in shutdown, allowing true output isolation - critical for USB-OTG and battery-powered designs where back-feeding the battery would damage cells or waste energy.
Typical applications include single-cell Li-ion powered portable electronics (smartphones, wearables, Bluetooth headsets, e-readers, tablets, point-of-sale terminals, GPS receivers, medical handheld devices), USB-OTG 5V boost supplies from a 3.0-4.2V Li-ion source, and any 2-cell-to-5V boost conversion where PCB area and efficiency both matter.
When designing with this part, place input/output ceramic capacitors as close as possible to the IC bumps, use a 1.0uH to 4.7uH shielded inductor with low DCR, and ensure the feedback divider uses 1% resistors. Thermal management is easier than linear regulators - switching losses dominate, but at 95% efficiency dissipation stays low.
This page synthesizes distributor pricing, drop-in alternatives in the same WLCSP-20 footprint, and practical design notes that go beyond the manufacturer datasheet - useful for engineers selecting parts during BOM review and second-source qualification.
Alternativas drop-in para ISL91117IIAZ-T7A — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ISL91117IIAZ-T7A (mesmo formato e footprint) — diferindo em Battery Compatibility, Operating Temperature Range, Output Disconnect, Output Voltage Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ISL91117IIAZ-T
✅ Drop-In✓ Em estoque
$0.36 / unidade
Ver ficha técnica →ISL91117IIAZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL91110II2AZ-T7A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL91117IIAZ-T7A-A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL91117IIAZ-T7A Classificações máximas e características elétricas
| Topologia | Synchronous Boost (Step-Up) |
| Faixa de tensão de entrada | 1.8 V to 4.8 V |
| Faixa de tensão de saída | Adjustable from 0.8 V upward |
| Maximum Switch Current | 3.7 A (4.2 A peak per datasheet title) |
| Corrente máxima de saída | 1.5 A (PVIN=3.3V, VOUT=5V) |
| Peak Efficiency | 95 % |
| Output Disconnect | Yes (internal synchronous MOSFET) |
| Faixa de temperatura de operação | -40 C to +85 C |
| Encapsulamento | 20-bump WLCSP (UFBGA), 2.015 mm x 1.6 mm |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Internal MOSFETs | Synchronous (high-side + low-side) integrated |
| Battery Compatibility | 1-cell Li-ion/Li-poly, 2-3 cell alkaline/NiCd/NiMH |
Configuração de pinos do ISL91117IIAZ-T7A
| Pino A1 | PGND — Power ground (return for synchronous MOSFET) |
| Pino A2 | SW — Switch node - connect to inductor |
| Pino A3 | PGND — Power ground |
| Pino A4 | VOUT — Boost regulator output |
| Pino A5 | VOUT — Boost regulator output |
| Pino B1 | VIN — Battery / input supply |
| Pino B2 | SW — Switch node |
| Pino B3 | SW — Switch node |
| Pino B4 | VOUT — Boost regulator output |
| Pino B5 | VOUT — Boost regulator output |
| Pino C1 | VIN — Battery / input supply |
| Pino C2 | VIN — Battery / input supply |
| Pino C3 | AGND — Analog ground |
| Pino C4 | VOUT — Boost regulator output |
| Pino C5 | VOUT — Boost regulator output |
| Pino D1 | EN — Enable (active high) |
| Pino D2 | FB — Feedback voltage (0.8V reference) |
| Pino D3 | AGND — Analog ground |
| Pino D4 | VOUT — Boost regulator output |
| Pino D5 | VOUT — Boost regulator output |
Aplicações típicas
ISL91117IIAZ-T7A é adequado para 6 aplicaçãos: USB-OTG 5V Boost from Single-Cell Li-ion, Wearable and Bluetooth Headset Power Supply, Portable Medical Handheld Device Power, GPS Receiver and Asset Tracker 3.3V Boost, E-Reader and Tablet Boost Supply, POS Terminal and Handheld Scanner Power.
USB-OTG 5V Boost from Single-Cell Li-ion
The ISL91117IIAZ-T7A is a textbook fit for USB-OTG 5V boost supplies in smartphones, tablets, and portable electronics that must power downstream USB peripherals from a single-cell Li-ion battery. Its 1.8-4.8V input covers the full Li-ion discharge curve (3.0-4.2V nominal), it delivers 1.5A at 5V output per the datasheet, and the integrated synchronous output-disconnect MOSFET prevents reverse current from VBUS back into the battery during OTG shutdown - a critical requirement of the USB-OTG specification. Place it between the battery and the USB VBUS pin with a 4.7uH shielded inductor and 22uF ceramic input/output capacitors for a complete OTG supply.
Recomendado
Wearable and Bluetooth Headset Power Supply
The ISL91117IIAZ-T7A's tiny 2.015mm x 1.6mm 20-bump WLCSP, 95% peak efficiency, and 3.7A switch rating make it ideal for space-constrained wearable and Bluetooth headset designs where every cubic millimeter counts. A single-cell Li-poly battery (3.7V nominal) needs to be boosted to 5V for charging companion ICs, for biasing RF power amplifiers, or for driving small OLED displays. Compared to a non-synchronous boost, the ISL91117's synchronous rectification saves 15-25% efficiency at 100mA loads, extending wearable battery life by hours. Its PFM/PWM automatic mode switching keeps quiescent losses low during sleep.
Recomendado
Portable Medical Handheld Device Power
The ISL91117IIAZ-T7A powers portable medical handheld devices such as glucose meters, pulse oximeters, and patient thermometers that run on 2x or 3x alkaline cells and need a stable 3.3V or 5V rail for the MCU, ADC, and LCD. With input range down to 1.8V, it operates from end-of-life alkaline voltage (each cell drops to ~0.9V), maximizing usable battery capacity. Output-disconnect isolation prevents back-feeding the cells in shutdown, which would otherwise shorten shelf life. Medical designs benefit from its industrial -40C to +85C operating range, which covers clinical environment temperature specs without derating.
Recomendado
GPS Receiver and Asset Tracker 3.3V Boost
GPS receivers, asset trackers, and personal navigation devices commonly run from 2x AA alkaline cells (2.0-3.4V) but need a stable 3.3V or 5V rail for the GPS module and microcontroller. The ISL91117IIAZ-T7A's 1.8-4.8V VIN range accepts the full alkaline discharge curve without premature low-battery cutoff, and its synchronous 95%-efficient operation minimizes current draw at idle - critical for asset trackers that spend 99% of their time in sleep mode. The output-disconnect feature eliminates leakage paths that would otherwise drain alkaline cells over months of storage.
Recomendado
E-Reader and Tablet Boost Supply
E-readers, e-paper tablets, and low-cost Android tablets often use a single-cell Li-poly battery with a 3.7-4.2V nominal voltage and need 5V boost rails for USB charging, audio amplifiers, and OLED bias. The ISL91117IIAZ-T7A provides 1.5A of output current at 5V from PVIN=3.3V, enough to power a 1W audio amplifier or a USB charging output. Its high 95% efficiency means minimal wasted heat in the slim tablet chassis, and its small WLCSP package frees PCB space for the display driver and WiFi/Bluetooth module.
Recomendado
POS Terminal and Handheld Scanner Power
Point-of-sale (POS) terminals, handheld barcode scanners, and mobile receipt printers are typically powered by 2-3 cell Li-ion or alkaline packs and need 5V boost rails for printer heads, RFID readers, and wireless modules. The ISL91117IIAZ-T7A delivers up to 1.5A at 5V output to drive these subsystems from a compact WLCSP footprint - critical for the slim, ergonomic form factor of modern POS hardware. Industrial temperature range of -40C to +85C supports outdoor POS terminals at construction sites, restaurants, and warehouses. Output disconnect prevents battery drain when the POS is docked.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ISL91117IIAZ-T7A — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ISL91117IIAZ-T | ISL91117IIAZ | ISL91110II2AZ-T7A | ISL91117IIAZ-T7A-A |
|---|---|---|---|---|---|
| Package | 20-bump WLCSP (2.015 x 1.6 mm) | 20-bump WLCSP - same | 20-bump WLCSP - same | 20-bump WLCSP - same | 20-bump WLCSP - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Topology | Synchronous Boost | Synchronous Boost | Synchronous Boost | Synchronous Boost | Synchronous Boost |
| Max Switch Current | 3.7 A (4.2 A peak) | 3.7 A | 3.7 A | 2.0 A (-46%) | 3.7 A |
| Max Output Current (PVIN=3.3V, VOUT=5V) | 1.5 A | 1.5 A | 1.5 A | ~0.8 A (-47%) | 1.5 A |
| Input Voltage Range | 1.8 V to 4.8 V | 1.8 V to 4.8 V | 1.8 V to 4.8 V | 1.8 V to 4.8 V | 1.8 V to 4.8 V |
| Output Disconnect | Yes | Yes | Yes | Yes | Yes |
| Peak Efficiency | 95 % | 95 % | 95 % | ~93 % | 95 % |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (AEC-Q100) |
| Shipping Format | Tape & Reel (T7A) | Tape & Reel (T) | Tray / Bulk | Tape & Reel (T7A) | Tape & Reel (T7A) |
Principais diferenciais
- Output-disconnect MOSFET integrated (vs Non-synchronous or non-disconnect boost regulators)
- Highest switch current in ISL911xx family (vs ISL91110II2AZ-T7A (2A switch))
- Tiny 20-bump WLCSP, 2.015mm x 1.6mm (vs Conventional QFN/MSOP boost converters)
Notas de projeto
Place the 4.7uH inductor as close as possible to the SW bumps to minimize switching-node parasitic inductance. Use a shielded inductor (e.g., Coilcraft XAL4030 or Murata DFE252012F) with low DCR (<50mohm) to maximize efficiency. Place input and output 22uF X5R/X7R ceramic capacitors (rated 10V or higher) within 2mm of the VIN and VOUT bumps; add a 0.1uF ceramic in parallel for high-frequency bypass.
Do NOT connect the load directly to the battery and rely on the boost output as the only 5V source if the application also operates in buck mode (e.g., when VIN > VOUT). The ISL91117 is a boost-only topology - when VIN exceeds the regulated VOUT, the synchronous MOSFET passes VIN directly through to the output. Ensure downstream circuitry can tolerate the worst-case VIN pass-through (4.8V max), or add an external blocking diode.
Estimated: at full 1.5A load, PVIN=3.3V, VOUT=5V, the ISL91117IIAZ-T7A dissipates roughly 0.39W ((VOUT-VIN)*IOUT/eta, with eta=95%). The 20-bump WLCSP has a theta_JA of approximately 60-80 C/W on a 4-layer 1oz PCB (verify against Renesas datasheet FN6686 thermal table), giving a junction temperature rise of 23-31C above ambient. No external heatsink is required for typical portable designs, but do not exceed 85C ambient for the standard part - choose the -A (AEC-Q100) variant for higher temperature operation.
Keep the feedback (FB) trace away from the SW node - route it on the opposite PCB layer or shield it with a ground pour. Use a 5-mil trace/space PCB process for the WLCSP land pattern; the Renesas evaluation board layout shows non-solder-mask-defined (NSMD) pads which are recommended for reliable BGA assembly. Ensure all four corner bumps (PGND) have multiple thermal vias to the inner ground plane for lowest thermal resistance.
Informações de conformidade
RoHS compliant per Renesas product page. Standard part is NOT AEC-Q100 qualified - choose ISL91117IIAZ-T7A-A for automotive. Halogen-free status not explicitly stated in verified data.
