LTC3576EUFE-1#PBF - USB OTG PMIC + Triple Buck | ADI
MPN: LTC3576EUFE-1#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.2 | $72.00 |
| 100 | $6.1 | $610.00 |
| 500 | $5.25 | $2,625.00 |
| 1,000 | $4.6 | $4,600.00 |
LTC3576EUFE-1#PBF Overview
A power management IC (PMIC) integrates multiple voltage regulators, charge controllers, supervisory blocks, and protection circuits into a single die to reduce board area, BOM count, and design complexity. Within the broader hierarchy, the LTC3576EUFE-1 belongs to the PMIC subcategory of power management ICs, which itself sits inside the analog/mixed-signal IC family. The -1 variant differs from the base LTC3576 in that most of its advanced features, including switching frequency, charge current, and input current limit, are only accessible through the I2C serial interface, allowing dynamic host-controlled reconfiguration of the entire power tree.
The bidirectional switching PowerPath topology allows current to flow from the wall adapter, USB, or battery to the system load with seamless, lossless transitions between sources. When external power is removed, the ideal diode keeps VOUT regulated from the battery without a discrete MOSFET, minimizing reverse leakage. An adjustable overvoltage clamp on VBUS and WALL protects the IC from transients using just two external components.
Typical applications include handheld and mobile devices, portable medical instruments, USB OTG peripherals, point-of-sale terminals, and any single-cell Li-Ion system that needs simultaneous USB charging and three regulated system rails. The LTC3576EUFE-1 supports autonomous operation once parameters are loaded but also enables a host processor to dynamically tune power sequencing. When designing with this part, allocate adequate copper area for thermal dissipation and follow the reference layout in the manufacturer datasheet for the 4mm x 6mm QFN exposed pad to keep junction temperature within safe limits at full charge and load current.
This page combines the manufacturer datasheet, distributor pricing, drop-in alternatives, and practical design notes into a single reference for engineers selecting a Li-Ion PMIC for handheld designs.
Drop-in alternatives for LTC3576EUFE-1#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC3576EUFE-1#PBF (same form factor and footprint) — differing in Operating Temperature, Overvoltage Protection, Package, RoHS Status, Topology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC3576EUFE#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3577EUFE#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3577EUFE-1#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3586EUFE#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3586EUFE-1#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3576EUFE-1#PBF Specifications
| Topology | PowerPath manager + 3x synchronous buck + battery charger |
| Battery Chemistry | Li-Ion / Li-Polymer (single cell) |
| Buck Converter 1 Output | 1.9 V to 3.6 V at 400 mA |
| Buck Converter 2 Output | 1.8 V to 3.4 V at 400 mA |
| Buck Converter 3 Output | 1.0 V to 1.8 V at 1 A |
| Number of Pins | 38 |
| Package | QFN-38 (4 mm x 6 mm x 0.75 mm) |
| Mounting Type | Surface Mount |
| USB On-the-Go Support | Yes (bidirectional) |
| Configuration Interface | I2C (LTC3576-1 variant) |
| Overvoltage Protection | Yes (VBUS / WALL, adjustable clamp) |
| Battery Charger Type | CC/CV with programmable current |
| Operating Temperature | -40 C to +85 C (industrial grade) |
| RoHS Status | Compliant (#PBF suffix) |
LTC3576EUFE-1#PBF qfn-38 (4 mm x 6 mm x 0.75 mm) Pin Configuration Guide
Pin configuration for LTC3576EUFE-1#PBF (qfn-38 (4 mm x 6 mm x 0.75 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for LTC3576EUFE-1#PBF.
Refer to the datasheet for full pin configuration.
Typical Applications
LTC3576EUFE-1#PBF is suitable for 6 applications: Handheld Mobile Devices, Portable Medical Instruments, USB OTG Peripherals, Point-of-Sale Terminals, Industrial Handheld Scanners, Portable Test and Measurement.
Handheld Mobile Devices
The LTC3576EUFE-1 powers handheld mobile devices by combining a Li-Ion charger, PowerPath manager, and three buck regulators in a 38-pin 4 mm x 6 mm QFN. Its 1 A buck rail can drive a processor core while the two 400 mA rails cover IO and memory, allowing the entire power tree from the USB/wall adapter to the system rails in one IC. The bidirectional PowerPath enables seamless transitions between wall, USB, and battery sources without drops, which is critical for smartphones, rugged handhelds, and wearable terminals that must stay alive during plug events.
Recommended
Portable Medical Instruments
The LTC3576EUFE-1 is well suited to portable medical instruments such as patient monitors, glucose meters, and handheld ultrasound probes that operate from a single Li-Ion cell. Its integrated charger and three synchronous buck rails minimize board area, while the USB OTG capability allows the instrument to power accessories or transfer data without an external boost converter. The PowerPath topology delivers uninterrupted system voltage during source swaps, a key requirement for medical devices that cannot tolerate a brown-out during patient monitoring.
Recommended
USB OTG Peripherals
The LTC3576EUFE-1 is widely used in USB On-the-Go peripherals such as portable SSDs, wireless speaker docks, and handheld printers. Its built-in OTG boost function powers 5V USB peripherals from the Li-Ion battery without an external boost IC, while the three buck rails generate the system core, IO, and memory voltages. This integration reduces BOM count and PCB area in space-constrained peripherals that need to act as either USB device or USB host.
Recommended
Point-of-Sale Terminals
The LTC3576EUFE-1 powers point-of-sale terminals that need a single-cell Li-Ion battery, USB charging, and multiple system rails. The 1 A buck supports an application processor, the 400 mA rails feed Wi-Fi/Bluetooth modules and a thermal printer, and the integrated charger eliminates the need for a standalone charge controller. The PowerPath manager prioritizes external power when present and seamlessly switches to battery when disconnected, keeping transactions alive during brief power interruptions.
Recommended
Industrial Handheld Scanners
Industrial handheld scanners benefit from the LTC3576EUFE-1's -40 C to +85 C industrial temperature range, integrated Li-Ion charging, and triple-buck output capability. The compact 38-pin 4 mm x 6 mm QFN fits the tight PCBs of barcode scanners and RFID readers, while the I2C interface (-1 variant) allows the host to tune charging current dynamically to balance charge time against thermal limits in harsh environments.
Recommended
Portable Test and Measurement
The LTC3576EUFE-1 supports portable test and measurement equipment such as handheld oscilloscopes, multimeters, and signal analyzers that require clean, regulated rails for sensitive analog front ends. The triple buck outputs can supply analog, digital, and IO domains with proper isolation between noise-sensitive sections, while the integrated charger and USB OTG simplify field use. Engineers can route a 1 A core rail for an MCU and two 400 mA rails for analog signal conditioning and display subsystems.
Recommended
Recommended Products Summary
Engineering reference data for LTC3576EUFE-1#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3576EUFE#PBF | LTC3577EUFE#PBF | LTC3577EUFE-1#PBF | LTC3586EUFE#PBF | LTC3586EUFE-1#PBF |
|---|---|---|---|---|---|---|
| Package | QFN-38 (4x6) | QFN-38 (4x6) - same | QFN-38 (4x6) - same | QFN-38 (4x6) - same | QFN-38 (4x6) - same | QFN-38 (4x6) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Configuration Interface | I2C | Resistor pins (no I2C) | Resistor pins | I2C | Resistor pins | I2C |
| Buck 1 Output | 1.9 V - 3.6 V at 400 mA | 1.9 V - 3.6 V at 400 mA | 1.9 V - 3.6 V at 400 mA | 1.9 V - 3.6 V at 400 mA | 1.9 V - 3.6 V at 400 mA | 1.9 V - 3.6 V at 400 mA |
| Buck 2 Output | 1.8 V - 3.4 V at 400 mA | 1.8 V - 3.4 V at 400 mA | 1.8 V - 3.4 V at 400 mA | 1.8 V - 3.4 V at 400 mA | 1.8 V - 3.4 V at 400 mA | 1.8 V - 3.4 V at 400 mA |
| Buck 3 Output | 1.0 V - 1.8 V at 1 A | 1.0 V - 1.8 V at 1 A | 1.0 V - 1.8 V at 1 A | 1.0 V - 1.8 V at 1 A | 1.0 V - 1.8 V at 1 A | 1.0 V - 1.8 V at 1 A |
| USB OTG Support | Yes | Yes | Yes | Yes | Yes | Yes |
| Battery Charger | CC/CV Li-Ion integrated | CC/CV Li-Ion integrated | CC/CV Li-Ion integrated | CC/CV Li-Ion integrated | CC/CV Li-Ion integrated | CC/CV Li-Ion integrated |
| 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 +85 C | -40 C to +85 C |
Key Differentiators
- Integrated USB On-the-Go boost function (vs LTC3566EUF#PBF)
- Three synchronous buck converters in one IC (vs LTC3553EUD-2#PBF)
- Bidirectional PowerPath manager with ideal diode (vs LTC4055-1)
Design Notes
The 38-pin QFN exposed thermal pad must be soldered to a sufficient copper pour on the top and inner PCB layers to keep junction temperature within the -40 C to +85 C industrial range. At maximum charge current with all three bucks delivering full load, total internal dissipation can reach several hundred milliwatts; route at least 1 square inch of 1 oz copper under the package, with multiple thermal vias to inner planes.
Place the input bulk capacitor on VBUS/WALL as close as possible to the IC pins, with a 1 uF ceramic bypass in parallel. Keep the buck converter inductor loops compact and route the high-di/dt switching nodes away from sensitive analog feedback traces. Use a star-ground topology with the exposed pad as the single low-impedance ground return to avoid ground bounce that could disrupt I2C communication on the -1 variant.
Do not exceed the absolute maximum ratings on VBUS or WALL (typically 7V transient with the integrated OVP clamp active). Confirm that the external high-voltage switching regulator MOSFET is rated for the WALL input spike voltage and that its gate drive is correctly tied to the LTC3576EUFE-1 NDRV pin. On the -1 variant, ensure I2C pull-up resistors are present and that the host initializes the configuration registers before the buck converters are enabled.
Estimate: with 4 layers of 1 oz copper and 1 square inch of top-layer pour under the QFN, the expected theta_JA is approximately 30-35 C/W. At 0.5 W total dissipation the junction temperature rise above ambient is around 17 C, leaving ample margin for the 85 C maximum in enclosed handheld enclosures. Increase the copper area or add a topside copper fill if total dissipation exceeds 0.7 W.
Compliance Information
RoHS and REACH compliant per the #PBF suffix designation. Not AEC-Q100 qualified; this part is targeted at consumer and industrial handheld products. Halogen-free per Analog Devices documentation.
