LTC4054XES5-4.2#TRBPF - 800mA Linear Li-Ion Charger | Analog Devices
Référence : LTC4054XES5-4.2#TRBPF ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.55 | $25,50 |
| 100 | $2.1 | $210,00 |
| 500 | $1.78 | $890,00 |
| 1 000 | $1.45 | $1 450,00 |
LTC4054XES5-4.2#TRBPF Présentation
A linear Li-Ion battery charger IC is a power-management component that converts an external DC supply (typically 5 V from USB or a wall adapter) into a precisely regulated, current-limited, constant-voltage charging profile for a single Li-Ion or Li-Polymer cell. It belongs to the broader hierarchy: linear charger -> battery charger -> wire -> battery management IC (BMIC) -> power management IC (PMIC) -> semiconductor. These devices integrate pass-element control, charge-termination logic, thermal feedback, and battery-voltage monitoring into a tiny package, replacing discrete implementations that previously required multiple op-amps, comparators, and pass MOSFETs.
Key features of the LTC4054XES5-4.2 include the unique thermal-regulation loop, which automatically reduces charge current as die temperature rises (typically above 105 °C junction), allowing designers to set the maximum charge current based on worst-case thermal conditions rather than nominal silicon limits. The internal PNP pass transistor eliminates the need for an external MOSFET, further reducing BOM count. The CHRG open-drain status output signals the user when charging is in progress. No blocking diode or sense resistor beyond the single programming resistor is required, and the charger requires only two external capacitors for full operation.
Architecturally, the LTC4054X uses a precision bandgap reference, a current-sense amplifier across the external sense resistor, an error amplifier for constant-current/constant-voltage regulation, and an on-chip PNP pass transistor. The thermal-regulation circuit compares die temperature to an internal 105 °C reference and throttles charge current proportionally, maintaining safe junction temperature even in thermally-constrained applications. The fixed 4.2 V float voltage is trimmed at the factory to within ±1 % at 25 °C.
Typical applications include single-cell Li-Ion/Li-Polymer battery charging in portable consumer electronics (Bluetooth headsets, fitness bands, smartwatches), wearable medical devices, IoT sensor nodes, USB-powered handhelds, and low-power wireless peripherals. The ThinSOT package enables compact PCB layouts with a footprint of roughly 2.9 mm × 1.6 mm.
When designing with this device, calculate worst-case power dissipation as P_D = (V_IN − V_BAT) × I_CHRG and ensure that the resulting junction temperature rise does not exceed the thermal-regulation threshold. Use a small thermal copper pour under the exposed pad to improve heat spreading, and select the sense resistor per I_CHRG = 1000 V / R_PROG per the datasheet's recommended I_SET formula. The thermal-regulation feature will automatically throttle current if dissipation exceeds safe limits.
Alternatives de remplacement direct pour LTC4054XES5-4.2#TRBPF — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC4054XES5-4.2#TRPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4054XES5-4.2#TRMPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4054ES5-4.2#TRMPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4054LES5-4.2#TRMPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MCP73831T-2ACI/OT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4054XES5-4.2#TRBPF Spécifications
| Fonction | Standalone Linear Li-Ion Battery Charger |
| Battery Chemistry | Lithium-Ion / Lithium-Polymer (single cell) |
| Float Voltage (V_FB) | 4.2 V ±1 % (factory trimmed) |
| Maximum Charge Current | 800 mA (programmable via external R_PROG) |
| Input Supply Voltage (V_IN) | 4.25 V to 6.5 V (with protection up to 10 V) |
| Programmed Charge Current Formula | I_CHRG = 1000 V / R_PROG (R_PROG in ohms) |
| Thermal Regulation Threshold | 105 °C (typical, junction) |
| Charge Status Output (CHRG) | Open-drain, active low during charging |
| Pass Element | Internal PNP transistor |
| Operating Temperature Range (E grade) | -40 °C to +85 °C (specified 0 °C to 70 °C, characterized -40 °C to 85 °C) |
| Boîtier | TSOT-23-5 (ThinSOT, 5-pin, 2.9 × 1.6 mm) |
| Type de montage | Surface Mount |
| Niveau MSL | 1 (per JEDEC J-STD-020) |
| Statut RoHS | Compliant (per #PBF suffix designation) |
| Lead-Free Finish | Yes (Pb-free, Au or Matte-Tin finish) |
| Required External Components | 2 capacitors (input & battery) + 1 programming resistor |
| Status Output Type | Open-drain (CHRG pin, requires external pull-up) |
Configuration des broches de LTC4054XES5-4.2#TRBPF
| Broche 1 | PROG — Charge-current programming resistor (R_PROG to GND sets ICHRG = 1000 V / R_PROG) |
| Broche 2 | GND — Ground reference |
| Broche 3 | BAT — Battery connection (charging output to Li-Ion cell) |
| Broche 4 | V_IN — Input supply voltage (4.25 V to 6.5 V) |
| Broche 5 | CHRG — Open-drain charge-status output, active LOW while charging |
Applications typiques
LTC4054XES5-4.2#TRBPF convient pour 6 applications: Wearable Fitness Band Single-Cell Charging, USB-Powered Bluetooth Headset Charger, IoT Sensor Node Li-Ion Trickle Charger, Portable Medical Monitoring Device, Wireless Earbuds Charging Case, Industrial Handheld Scanner Battery Charging.
Wearable Fitness Band Single-Cell Charging
The LTC4054XES5-4.2#TRBPF is ideally matched to wearable fitness band charging: its 800 mA maximum charge current allows bulk-charging a 100–300 mAh Li-Poly cell in under 1 hour, while its 105 °C thermal-regulation loop protects the small PCB from overheating during fast charge when worn against the body. The TSOT-23-5 footprint occupies ~4.5 mm² of board area, leaving room for the battery, BLE SoC, and a haptic driver. Compared to larger SOP-8 chargers, the ThinSOT package enables sub-10 mm width designs. Recommended companion parts: Nordic nRF52832 (BLE SoC), Maxim MAX17048 (fuel gauge).
Recommandé
USB-Powered Bluetooth Headset Charger
A Bluetooth headset charging cradle draws 5 V from a USB port and charges a 60–120 mAh Li-Poly cell inside the earpiece. The LTC4054XES5-4.2's 4.25 V to 6.5 V input range accepts USB VBUS directly, while its programmable charge current (set via R_PROG) lets the designer dial down to 100–200 mA for a small form-factor cell without overheating. The CHRG open-drain pin drives an LED for visual charge status. Pair this charger with a low-dropout LDO for analog/audio rails, and a fuel gauge IC for headset case battery telemetry. Its small footprint makes it ideal for the earpiece's cramped interior.
Recommandé
IoT Sensor Node Li-Ion Trickle Charger
An IoT sensor node (e.g. LoRa, Zigbee, or Matter endpoint) typically runs from a single 18650 or pouch Li-Ion cell recharged from a 5 V solar panel or USB-C input. The LTC4054XES5-4.2's wide 4.25 V to 6.5 V supply range tolerates solar panel voltage variation under load, and its thermal regulation gracefully throttles charge current when the enclosure sits in direct sunlight at elevated ambient temperatures. The CHRG status output can wake the host MCU only when a charge cycle completes, reducing quiescent draw and extending battery life. Programmable ICHRG up to 800 mA enables fast daytime recovery while still supporting low-rate trickle modes via PROG resistor selection.
Recommandé
Portable Medical Monitoring Device
A portable medical monitor (pulse oximeter, glucose meter, single-lead ECG patch) must charge its 400–800 mAh Li-Poly cell reliably from USB or a wall adapter without exceeding safe cell temperatures. The LTC4054XES5-4.2's on-die thermal regulation is critical here: it prevents the cell from being charged at excessive rates that could degrade electrolyte chemistry or violate IEC 60601 patient-safety limits. The fixed 4.2 V ±1 % float voltage ensures the cell stays within manufacturer-recommended voltage limits, preserving cycle life for the medical device's 3–5 year service interval.
Recommandé
Wireless Earbuds Charging Case
True Wireless Stereo (TWS) earbuds charging cases typically use a 400–600 mAh Li-Poly cell to top up the earbuds multiple times. The LTC4054XES5-4.2 charges this case cell from USB-C VBUS at up to 800 mA, replenishing the cell in 30–45 minutes. The TSOT-23-5 footprint is small enough for the case's compact interior, and the thermal-regulation loop prevents overheating when the case is sealed shut during fast charge. The CHRG output drives a single status LED through a simple MOSFET or transistor. Recommended companion: a bidirectional power-path controller for simultaneous case-cell charge and earbud output.
Recommandé
Industrial Handheld Scanner Battery Charging
An industrial barcode/RFID handheld scanner runs from a 1500–2500 mAh Li-Ion cell that must be field-charged from USB or a 5 V cradle. The LTC4054XES5-4.2's 800 mA maximum charge current supports fast top-up during shift breaks, while its on-die thermal regulation tolerates elevated enclosure temperatures when the scanner is left in a hot vehicle or warehouse. The wide 4.25 V to 6.5 V input supply range accepts unregulated 5 V rails typical of industrial USB hubs. Compared to switching chargers, the linear architecture introduces no high-frequency EMI that could disrupt the scanner's RF subsystem.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC4054XES5-4.2#TRBPF — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC4054XES5-4.2#TRPBF | LTC4054XES5-4.2#TRMPBF | LTC4054ES5-4.2#TRMPBF | LTC4054LES5-4.2#TRMPBF | MCP73831T-2ACI/OT |
|---|---|---|---|---|---|---|
| Package | TSOT-23-5 (ThinSOT) | TSOT-23-5 (ThinSOT) - same | TSOT-23-5 (ThinSOT) - same | TSOT-23-5 (ThinSOT) - same | TSOT-23-5 (ThinSOT) - same | SOT-23-5 - same 5-pin count, slightly different pinout |
| Brand | Analog Devices | Analog Devices (same) | Analog Devices (same) | Analog Devices (same) | Analog Devices (same) | Microchip Technology |
| Maximum Charge Current | 800 mA | 800 mA | 800 mA | 500 mA (-37.5%) | 180 mA (-77.5%) | 500 mA (-37.5%) |
| Float Voltage (V_FB) | 4.2 V ±1 % | 4.2 V ±1 % | 4.2 V ±1 % | 4.2 V ±1 % | 4.2 V ±1 % | 4.2 V ±0.75 % |
| Input Voltage Range | 4.25 V to 6.5 V | 4.25 V to 6.5 V | 4.25 V to 6.5 V | 4.25 V to 6.5 V | 4.25 V to 6.5 V | 3.75 V to 6 V |
| Thermal Regulation | Yes (105 °C junction) | Yes (105 °C junction) | Yes (105 °C junction) | Yes (105 °C junction) | Yes (105 °C junction) | No (uses thermal shutdown only) |
| Pass Element | Internal PNP transistor | Internal PNP | Internal PNP | Internal PNP | Internal PNP | Internal P-channel MOSFET |
| CHRG Status Output | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain, STAT pin) |
| RoHS / Lead-Free | Yes / Yes (#TRBPF) | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
Principaux différenciateurs
- Highest charge current in LTC4054 ThinSOT family (vs LTC4054ES5-4.2)
- Built-in thermal regulation loop (no software throttling required) (vs MCP73831T-2ACI/OT)
- Wide 4.25 V to 6.5 V input range for USB and wall-adapter sources (vs MCP73831T-2ACI/OT)
- Integrated PNP pass transistor (no external MOSFET) (vs Discrete linear charger designs)
Notes de conception
Estimated: at V_IN = 5 V, V_BAT = 3.7 V (typical during charge), and ICHRG = 800 mA, the LTC4054XES5-4.2 dissipates approximately (5 V − 3.7 V) × 0.8 A = 1.04 W in the internal PNP pass transistor. With TSOT-23-5 package θJA around 90 °C/W on a small 1 oz copper pour, the die temperature rises ~94 °C above ambient at 25 °C — well within the 105 °C thermal-regulation threshold. If your PCB layout cannot dedicate 100 mm² of thermal copper to the GND pin, the thermal-regulation loop will automatically throttle charge current below the nominal 800 mA — that is normal operation, not a fault.
Place the input bypass capacitor (1 µF minimum, X7R) within 2 mm of the V_IN pin and the BAT output capacitor (1 µF minimum, X7R) within 2 mm of the BAT pin. Keep the PROG resistor ground return path short and direct to the GND pin (pin 2) to avoid ground-bounce errors in the charge-current sense amplifier. The exposed thermal pad (when used) must be soldered to a continuous GND copper pour of at least 50 mm² for reliable heat spreading.
Do not exceed the absolute maximum V_IN of 10 V — even brief transients above 10 V can permanently damage the IC. Do not operate below 4.25 V V_IN or the float-voltage accuracy degrades. Do not connect a reverse-polarity supply to V_IN; the LTC4054XES5-4.2 does not include reverse-polarity protection. If the application needs reverse-polarity protection, add a P-MOSFET or Schottky diode at V_IN. Always read the datasheet's Battery Connection section before laying out the PCB — long BAT traces introduce parasitic inductance that can cause instability.
Route the BAT pin trace directly to the battery with the output capacitor as close to the IC as possible — never through a ferrite bead or inductor. The BAT pin carries the full charge current and any series impedance will degrade charge-current regulation and may trigger early thermal throttling. The CHRG output is open-drain and requires an external pull-up resistor (typically 100 kΩ to V_IN) plus a series resistor to limit LED current when driving a status LED.
Informations de conformité
RoHS compliant and Pb-free per the #TRBPF suffix designation on the part number per Analog Devices product marking convention. Halogen-free per JEDEC JS709B. Not AEC-Q100 qualified — for automotive applications requiring AEC-Q100, refer to the LTC4054XES5-4.2 automotive grade variants (consult Analog Devices sales).
