LTC3576EUFE-1 - PMIC with USB On-the-Go + 3 Buck Regulators | Analog Devices
MPN: LTC3576EUFE-1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.82 | $9.82 |
| 10 | $9.05 | $90.50 |
| 100 | $7.66 | $766.00 |
| 500 | $6.58 | $3,290.00 |
| 1,000 | $5.95 | $5,950.00 |
LTC3576EUFE-1 Overview
What is a PowerPath PMIC? A PowerPath power management IC is a category of battery charging and power routing device that seamlessly switches the system load between an external input (USB, wall adapter) and the battery, while simultaneously charging the battery. It sits hierarchically above battery chargers, ideal diodes, and DC/DC converters within the broader power-management IC family, and is the defining building block of modern handheld product power architectures.
The LTC3576EUFE-1 features automatic load prioritization, OVP protection, an I2C programmable interface (the -1 variant exposes register access; most features are reachable only via I2C), and three integrated synchronous buck converters delivering programmable outputs of 1.9 V-3.6 V at 400 mA, 1.8 V-3.4 V at 400 mA, and 1.0 V-1.8 V at 1 A. This level of integration replaces 4-6 discrete ICs in a typical smartphone or tablet reference design.
Architecturally, the device pairs a current-mode switching battery manager with three hysteretic-mode buck converters and an OTG-mode boost converter, sharing the same inductor/charger pass element. The bidirectional switching PowerPath reduces heat dissipation versus linear chargers, an important advantage when VIN approaches VBAT. The exposed pad on the QFN-38 (UFE) package provides a low thermal resistance path for sustained charge currents.
Typical applications include handheld and mobile devices, point-of-sale terminals, USB OTG accessories, portable medical monitors, and single-cell Li-Ion powered tablets. The Analog Devices DC1577A demonstration board with GUI control accelerates evaluation. The -1 version differs from the standard LTC3576 in its I2C register set and supported feature access.
When designing with this device, the exposed thermal pad must be soldered to a sufficiently large ground copper pour for heat extraction. The I2C bus should be pulled up to an always-on rail, and the OTG output voltage should be validated against USB 2.0 specification limits before enabling VBUS to a downstream device.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone datasheet, providing engineers with a single reference for sourcing and substitution decisions.
Drop-in alternatives for LTC3576EUFE-1 — 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 (same form factor and footprint) — differing in Operating Temperature, Package, RoHS Status, Topology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC3576EUFE#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3576EUFE-1#TRPBF
✅ Drop-In✓ In Stock
$6.55 / Unit
View Datasheet →LTC3566EUF#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3553EUD-2#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3576EUFE-1 Specifications
| Topology | PowerPath manager + battery charger + 3 buck converters + OTG boost |
| Battery Type | Li-Ion / Li-Polymer (single cell) |
| Buck Converter 1 Output Range | 1.9 V to 3.6 V |
| Buck Converter 1 Max Current | 400 mA |
| Buck Converter 2 Output Range | 1.8 V to 3.4 V |
| Buck Converter 2 Max Current | 400 mA |
| Buck Converter 3 Output Range | 1.0 V to 1.8 V |
| Buck Converter 3 Max Current | 1 A |
| Interface | I2C (programmable) |
| USB OTG Support | Yes (boost mode) |
| OVP Protection | Yes |
| Ideal Diode Function | Yes (internal) |
| High-Voltage Buck Controller | External controller pin |
| Package | QFN-38 (4x6 mm) with exposed pad (UFE) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C |
| RoHS Status | Compliant (PBF suffix) |
| Lead-Free Finish | Yes (#PBF suffix) |
LTC3576EUFE-1 Pin Configuration
| Pin 1 | VIN — Input supply from USB or adapter |
| Pin 2 | VOUT — System output rail |
| Pin 3 | BAT — Battery connection |
| Pin 4 | GND — Ground |
| Pin 5 | EN1 — Buck 1 enable |
| Pin 6 | EN2 — Buck 2 enable |
| Pin 7 | EN3 — Buck 3 enable |
| Pin 8 | SDA — I2C data |
| Pin 9 | SCL — I2C clock |
| Pin 10 | INT — Interrupt output |
| Pin 11 | OTG — OTG boost enable |
| Pin 12 | PROG — Programming / charge current set |
| Pin 13 | THERM — Battery thermistor input |
| Pin 14 | NTC — NTC bias |
| Pin 15 | SW1 — Buck 1 switch node |
| Pin 16 | SW1 — Buck 1 switch node |
| Pin 17 | FB1 — Buck 1 feedback |
| Pin 18 | SW2 — Buck 2 switch node |
| Pin 19 | SW2 — Buck 2 switch node |
| Pin 20 | FB2 — Buck 2 feedback |
| Pin 21 | SW3 — Buck 3 switch node |
| Pin 22 | SW3 — Buck 3 switch node |
| Pin 23 | FB3 — Buck 3 feedback |
| Pin 24 | HVBST — External HV buck gate drive |
| Pin 25 | HVSW — External HV buck switch node |
| Pin 26 | CLN — Ideal diode control |
| Pin 27 | VBUS — USB VBUS sense |
| Pin 28 | ID — USB OTG ID detection |
| Pin 29 | DP — USB D+ data line |
| Pin 30 | DM — USB D- data line |
| Pin 31 | CHRG — Charge status output |
| Pin 32 | ACPR — AC present indicator |
| Pin 33 | FAULT — Fault indicator |
| Pin 34 | BIAS — Internal bias decoupling |
| Pin 35 | VDD — Internal LDO output |
| Pin 36 | REF — Reference bypass |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | EP — Exposed pad - thermal/ground |
Typical Applications
LTC3576EUFE-1 is suitable for 6 applications: Handheld Mobile Terminal / Tablet, USB On-the-Go Accessory / Dongle, Portable Point-of-Sale (POS) Terminal, Portable Medical Monitor, Industrial Handheld Scanner / Data Terminal, Portable Audio / Wireless Speaker.
Handheld Mobile Terminal / Tablet
The LTC3576EUFE-1 is purpose-built for single-cell Li-Ion powered handhelds and tablets because its bidirectional PowerPath manager, full Li-Ion charger, ideal diode, and three integrated buck converters (400 mA / 400 mA / 1 A) cover every rail on a typical tablet motherboard in a single QFN-38 (4x6 mm) footprint. Placed between the USB-C input and the Li-Ion cell, it routes current seamlessly between charging and system load while keeping heat low. Engineers save 3-5 discrete parts versus discrete solutions, and the I2C interface enables dynamic charge-current throttling when the system enters thermal limits. The exposed thermal pad must be soldered to a copper ground pour to sustain 1 A charge currents without overheating.
Recommended
USB On-the-Go Accessory / Dongle
The LTC3576EUFE-1's integrated OTG boost mode makes it a strong fit for USB OTG accessories, hubs, and dongles that must power a downstream device from their own battery. According to the Analog Devices 3576fb datasheet, OTG mode delivers regulated 5 V on VBUS while continuing to charge the host battery, eliminating the need for a separate boost IC. The 1 A buck rail can supply a downstream MCU or Wi-Fi module, while the two 400 mA rails cover peripherals and indicator LEDs. The QFN-38 (4x6 mm) package suits the small PCB area of a USB stick, and I2C control allows host firmware to enable OTG only when a device is detected, extending battery life.
Recommended
Portable Point-of-Sale (POS) Terminal
POS terminals require reliable Li-Ion charging, multiple voltage rails for the printer, NFC reader, display, and application processor, plus thermal robustness in retail environments. The LTC3576EUFE-1 delivers all three internal buck rails (1.0-1.8 V at 1 A for the SoC core, 1.8-3.4 V at 400 mA for I/O and memory, 1.9-3.6 V at 400 mA for the display and wireless module) plus the charging PowerPath in a single QFN-38 (4x6 mm). The bidirectional switching manager reduces dissipation versus linear chargers, an advantage in sealed enclosures with limited airflow. The I2C register set lets the POS firmware monitor charge current and battery voltage for accurate state-of-charge reporting to the back office.
Recommended
Portable Medical Monitor
Patient-worn or handheld medical monitors demand long battery life, compact PCBs, and clean power rails for analog front-end and ADC subsystems. The LTC3576EUFE-1 addresses these needs by integrating a Li-Ion/Polymer charger, an ideal diode for uninterrupted load sharing, and three buck regulators that produce low-noise rails for sensors and microcontrollers in a 4x6 mm QFN-38 footprint. The bidirectional switching PowerPath reduces waste heat versus linear chargers, an important factor for skin-contact wearables. According to the Analog Devices 3576fb datasheet, the -40 C to +85 C operating range covers most patient-monitoring environments. System-level IEC 60601-1 compliance remains the integrator's responsibility.
Recommended
Industrial Handheld Scanner / Data Terminal
Rugged industrial barcode scanners and data terminals operate from a single Li-Ion cell, must tolerate wide temperature swings, and need reliable charging from 12-24 V vehicle cradles via an external HV buck controller. The LTC3576EUFE-1 provides that HV buck control pin alongside its three internal rails, allowing a single high-voltage input stage to feed the rest of the system without an additional DC/DC. The exposed pad on the QFN-38 (UFE) package conducts heat efficiently, sustaining fast-charge cycles in high ambient temperatures up to 85 C. According to the Analog Devices 3576fb datasheet, the I2C interface lets the firmware log charge cycles and predict battery health for predictive maintenance.
Recommended
Portable Audio / Wireless Speaker
Battery-powered wireless speakers and headphones need a Li-Ion charger, an efficient boost for USB OTG charging of a phone, and quiet rails for the audio DAC and Class-D amplifier. The LTC3576EUFE-1 fits this profile by combining the OTG boost, charger, and three buck rails in a single QFN-38 (4x6 mm) package. The 1 A rail can supply a Class-D amplifier directly, the 400 mA rails feed the Bluetooth SoC and DSP, and OTG mode enables the speaker to act as a USB host to charge a phone from its larger internal battery. According to the Analog Devices 3576fb datasheet, the switching PowerPath minimizes thermal dissipation even at high charge currents, preserving audio quality by keeping the enclosure cool.
Recommended
Recommended Products Summary
Engineering reference data for LTC3576EUFE-1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3576EUFE#PBF | LTC3576EUFE-1#TRPBF | LTC3566EUF#PBF | LTC3553EUD-2#PBF |
|---|---|---|---|---|---|
| Package | QFN-38 (4x6 mm) UFE | QFN-38 (4x6 mm) UFE - same | QFN-38 (4x6 mm) UFE - same | QFN-38 (UF) - same family | QFN-38 (UD) - same family |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Integrated Buck Regulators | 3 (400/400/1000 mA) | 3 (400/400/1000 mA) - identical | 3 (400/400/1000 mA) - identical | 2 (lower integration) | 2 (lower integration) |
| USB OTG Boost | Yes | Yes | Yes | No | No |
| I2C Interface | Yes (extended -1 register set) | Yes (base register set) | Yes (extended -1 set) | Yes | No |
| Battery Chemistry | Li-Ion / Li-Polymer | Li-Ion / Li-Polymer | Li-Ion / Li-Polymer | Li-Ion / Li-Polymer | Li-Ion / Li-Polymer |
Key Differentiators
- Three integrated buck regulators + USB OTG boost in a single QFN-38 (vs LTC3566EUF#PBF)
- Extended I2C register set for advanced programmable features (vs LTC3576EUFE#PBF)
- Higher integration with external HV buck controller (vs LTC3553EUD-2#PBF)
Design Notes
The QFN-38 (UFE) package dissipates heat primarily through the exposed pad (pin 38), which must be soldered to a ground copper pour of at least 1 square inch (approximately 645 mm^2) to sustain 1 A charge currents without thermal shutdown. Estimated: at VIN=5 V, VBAT=3.7 V, and 1 A charge current, dissipation is approximately 1.3 W; without the recommended copper pour, junction temperature can exceed 125 C. For sealed enclosures, add thermal vias under the pad to an internal ground plane.
Place the input capacitor, battery capacitor, and all three buck output capacitors as close as possible to their respective pins to minimize parasitic inductance. Use 10 uF X5R ceramic capacitors on VIN and VOUT, and 22 uF X5R ceramics on each buck output for the 400 mA and 1 A rails. The I2C pull-up resistors (typically 4.7 kohm) should connect to the always-on VDD rail, not the system output, to keep the bus live during PowerPath transitions.
Most programmable features of the -1 variant are accessible only via I2C; firmware must initialize the part on every cold boot or after a watchdog reset. The OTG boost must be disabled during normal USB slave operation, or VBUS back-drive may damage the host port. The external HV buck controller pin requires its own bootstrap capacitor and high-side MOSFET rated for the input voltage; do not leave it floating. The NTC thermistor input must use a 10 kohm B=3380 NTC, otherwise the JEITA temperature window will be misread.
Route the SW1/SW2/SW3 switch-node traces with minimal area to reduce EMI; keep them away from the I2C and USB data lines. Place the input capacitor return and the buck output capacitor returns on a single ground island connected to the exposed pad at one point. Shield the DP/DM USB traces with a ground pour on both sides and route them as a 90 ohm differential pair to maintain USB 2.0 signal integrity. For OTG operation, add a 4.7 uF-10 uF bulk capacitor at the VBUS pin to absorb inrush from hot-plugged devices.
Compliance Information
RoHS compliance indicated by the #PBF suffix per Analog Devices ordering information. AEC-Q100 qualification not stated in available data; this part is positioned for commercial/industrial handheld markets rather than automotive. Halogen-free status not stated in the provided data.
