LTC4054XES5-4.2#PBF - 800mA Linear Li-Ion Charger | Analog Devices
Référence : LTC4054XES5-4.2#PBF ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.2 | $3,20 |
| 10 | $2.85 | $28,50 |
| 100 | $2.4 | $240,00 |
| 500 | $1.95 | $975,00 |
| 1 000 | $1.6 | $1 600,00 |
| 2 500 | $1.35 | $3 375,00 |
LTC4054XES5-4.2#PBF Présentation
A linear battery charger is a power management integrated circuit (PMIC) that regulates current and voltage delivered to a rechargeable cell using an internal pass element rather than a switching topology. Linear chargers belong to the broader charger IC family, which also includes switching chargers and boost-based chargers; within the battery management hierarchy they sit between protection/gauging ICs and the system load. Compared with switchers, linear chargers produce no switching ripple, exhibit lower EMI, and provide simpler PCB layouts, but dissipate more heat at high VIN-VBAT deltas.
Key features of the LTC4054XES5-4.2#PBF include programmable charge current up to 800 mA set by a single external resistor (RPROG_LIMIT), an internal thermal-regulation loop that reduces charge current as junction temperature rises, an open-drain CHRG status output, automatic recharge when battery voltage drops, and a low 25 µA shutdown supply current when disabled. The ThinSOT-23-5 footprint allows drop-in compatibility with the LTC4054-4.2 family and supports hand-held, USB-powered, and wearable designs.
The architecture combines a precision bandgap reference, a current-sense amplifier, an adjustable P-channel pass transistor, and a comparator-driven thermal fold-back circuit. Charge qualification follows the standard CC/CV (constant-current / constant-voltage) profile used by all single-cell Li-Ion chargers, with charge termination triggered when charge current falls below approximately 10% of programmed ICHG. The thermal regulation loop is essential in ThinSOT packages where theta_JA is high, preventing the die from exceeding safe temperatures at high charge currents.
Typical applications include single-cell Li-Ion / Li-Polymer charging in wearable devices, Bluetooth headsets, IoT sensor nodes, USB-powered handheld electronics, backup battery packs, and low-cost lithium primary-cell replacement circuits. The fixed 4.2 V output suits any standard single-cell Li-Ion chemistry.
When designing with this part, place the input capacitor close to VIN and the BAT bypass capacitor close to the BAT pin; both should be at least 4.7 µF with low ESR. Verify thermal rise at maximum VIN, IBAT, and ambient conditions; if the ThinSOT junction approaches 100 °C, thermal regulation will throttle the current and extend charge time.
This page synthesizes distributor pricing, drop-in ThinSOT alternatives, and practical layout notes beyond the manufacturer datasheet to accelerate charger selection.
Alternatives de remplacement direct pour LTC4054XES5-4.2#PBF — 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#TRPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4054ES5-4.2#TRMPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTH7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
STC4054GR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC4054XES5-4.2#PBF Spécifications
| Battery Chemistry | Lithium Ion / Lithium Polymer (single cell) |
| Charge Voltage | 4.2 V ±1% |
| Maximum Charge Current | 800 mA (programmable) |
| Input Voltage Range (VIN) | 4.25 V to 6.5 V |
| Supply Current (Shutdown) | 25 µA |
| Charge Method | CC / CV (Constant-Current / Constant-Voltage) |
| Thermal Regulation | Yes (internal fold-back) |
| Status Output (CHRG) | Open-drain, active-low |
| Automatic Recharge | Yes |
| Undervoltage Lockout | Yes (per datasheet) |
| Plage de température de fonctionnement | -40 °C to +85 °C |
| Boîtier / Format | TSOT-23-5 (ThinSOT, 5-pin) |
| Type de montage | Surface Mount |
| Niveau MSL | 1 |
| Lead-Free / RoHS | Yes (PBF suffix denotes lead-free, RoHS compliant) |
| External Components Required | RPROG, CIN, CBAT |
Configuration des broches de LTC4054XES5-4.2#PBF
| Broche 1 | VIN — Input supply (4.25 V to 6.5 V) |
| Broche 2 | GND — Ground |
| Broche 3 | BAT — Battery connection and charge current output |
| Broche 4 | CHRG — Open-drain charge status output (active low while charging) |
| Broche 5 | PROG — Charge current program / shutdown (set RPROG to GND) |
Applications typiques
LTC4054XES5-4.2#PBF convient pour 7 applications: Wearable Device Li-Ion Charging, Bluetooth Headset and Earbud Charging, USB-Powered Handheld Electronics, IoT Sensor Node Li-Ion Backup, Lithium Primary Cell Replacement Circuit, Backup Battery Pack for Memory and RTC, Point-of-Sale and Wireless Terminal Charging Cradles.
Wearable Device Li-Ion Charging
The LTC4054XES5-4.2#PBF's 800 mA programmable current and 4.2 V ±1% regulation suit wearable Li-Ion / Li-Polymer packs where charge time is critical and PCB area is scarce. The ThinSOT-23-5 footprint plus integrated thermal regulation lets designers place the charger directly under a USB-C or pogo-pin connector without heatsinking. Compared with a switching charger, the LTC4054X adds no switching ripple to the cell, which is important for low-noise wearable analog front ends. The 25 µA shutdown current minimizes standby drain when the host is powered down.
Recommandé
Bluetooth Headset and Earbud Charging
Compact Bluetooth audio accessories draw 200-500 mA during charge and benefit from the LTC4054XES5-4.2#PBF's small ThinSOT-23-5 footprint and low BOM count. With only an RPROG resistor, CIN, and CBAT required, the charger fits inside the cradle or stem. The CC/CV profile with internal thermal fold-back prevents overheating inside sealed enclosures that lack thermal vias. The open-drain CHRG output can drive an LED through a single resistor for user-visible charging indication.
Recommandé
USB-Powered Handheld Electronics
Handheld test gear, e-readers, and personal medical devices frequently draw charge current from a 5 V USB VBUS rail, which maps directly to the LTC4054XES5-4.2#PBF's 4.25 V to 6.5 V VIN window. The device's lack of switching noise is valuable for handhelds with sensitive ADCs, while the small ThinSOT package keeps the charger footprint under 0.15 square inches. Program the charge current via RPROG to respect USB 2.0 high-power (500 mA) or USB 3.0 (900 mA) enumeration limits.
Recommandé
IoT Sensor Node Li-Ion Backup
Battery-backed IoT nodes use the LTC4054XES5-4.2#PBF to trickle-charge a small Li-Ion cell from a 5 V rail or solar panel. The 25 µA shutdown current keeps quiescent draw minimal when the system is in deep sleep, while the open-drain CHRG output can wake the host MCU on charge completion. Thermal fold-back allows the part to sit in direct sun (with high VIN-VBAT differential) without exceeding junction limits. Pin-compatible footprint lets designers swap to the LTC4054L-4.2 if even lower standby drain is needed.
Recommandé
Lithium Primary Cell Replacement Circuit
Industrial designs migrating from primary lithium (LiSOCl2 / LiMnO2) cells to rechargeable Li-Ion benefit from the LTC4054XES5-4.2#PBF's mature CC/CV algorithm and small PCB footprint. The fixed 4.2 V charge profile is compatible with off-the-shelf Li-Ion 14500 / 18650 cells, and the part's -40 °C to +85 °C operating range suits outdoor metering and asset-tracking hardware. Drop-in ThinSOT-23-5 packaging simplifies retrofits into existing battery holders.
Recommandé
Backup Battery Pack for Memory and RTC
Embedded systems that use small Li-Ion coin-cell substitutes (such as 1S Li-Ion soft-packs) to back up SRAM, RTCs, or GPS almanacs rely on the LTC4054XES5-4.2#PBF's low BOM charger IC. The 25 µA shutdown current is irrelevant compared with the cell's self-discharge, while the 800 mA peak capability lets the same charger serve diagnostic or field-replaceable packs. The CHRG pin can be wired directly to a microcontroller GPIO without level shifting.
Recommandé
Point-of-Sale and Wireless Terminal Charging Cradles
Charging cradles in point-of-sale and handheld scanner terminals use the LTC4054XES5-4.2#PBF to charge a removable Li-Ion battery pack from a 5 V wall adapter. The ThinSOT-23-5 device survives sustained 1 A charge cycles thanks to thermal regulation, and the open-drain CHRG output drives an LED indicator for end-user feedback. Pin compatibility with the LTC4054L-4.2 lets designers tier their cradle variants between 800 mA fast and 250 mA trickle charge.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC4054XES5-4.2#PBF — 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#TRPBF | LTC4054ES5-4.2#TRMPBF | LTH7 | STC4054GR |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | LOWPOWER | STC (Suntek / Chinese analog) |
| 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 | TSOT-23-5 (ThinSOT) - same | TSOT-23-5 (ThinSOT) - same |
| Charge Voltage | 4.2 V ±1% | 4.2 V ±1% | 4.2 V ±1% | 4.2 V ±1% | 4.2 V ±1% | 4.2 V | 4.2 V (typical) |
| CHRG Status Pin | Open-drain, active low | Open-drain, active low | Open-drain, active low | Open-drain, active low | Open-drain, active low | Open-drain (verify polarity) | Open-drain (verify polarity) |
| Lead-Free / RoHS | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Varies by reel code | Varies by reel code |
Principaux différenciateurs
- Higher 800 mA charge current versus the 500 mA LTC4054E-4.2 (vs LTC4054ES5-4.2#TRPBF)
- Drop-in TSOT-23-5 packaging matches the entire LTC4054 family (vs LTC4054L-4.2 family (lower-IQ variant))
- Internal thermal regulation eliminates need for external NTC monitoring (vs Discrete thermal-cutoff solutions)
Notes de conception
Estimated: at VIN = 5 V, VOUT/BAT = 3.7 V (typical Li-Ion), ICHG = 800 mA, the LTC4054XES5-4.2#PBF dissipates roughly (5 - 3.7) * 0.8 = 1.04 W. The ThinSOT-23-5 package has a typical theta_JA around 200-250 °C/W on a 1 square inch 2-oz copper pour, giving a junction rise of 200-260 °C above ambient. Thermal regulation will fold the charge current back once the die approaches its regulation point; verify with a thermal probe at maximum VIN and full ICHG to confirm the charger delivers expected current in your enclosure.
Place CIN and CBAT as close as possible to the LTC4054XES5-4.2#PBF's VIN and BAT pins respectively, using 4.7 µF X5R or X7R ceramic capacitors with low ESR. Keep the BAT trace short and wide to minimize parasitic inductance, which can cause instability on the CC/CV control loop. Provide a small thermal copper pour under the TSOT-23-5 exposed pad (where present on the PCB footprint) to improve thermal dissipation, and route the PROG resistor directly to the PROG pin with minimum trace length.
Do not pull VIN above 6.5 V - the LTC4054XES5-4.2#PBF's absolute maximum is 7 V and sustained operation beyond 6.5 V risks damage. The PROG pin doubles as the enable input: tying PROG high disables the charger, while a resistor to GND sets the charge current. Always include a 1 kΩ or larger pull-up on the CHRG open-drain output if the host needs to read the status in noisy environments. Finally, the LTC4054X will not protect against charging a deeply discharged cell below 2.5 V - add an undervoltage lockout if your system must reject those packs.
Use the LTC4054XES5-4.2#PBF's CC/CV profile to size upstream USB VBUS protection correctly: program RPROG so ICHG stays under the USB 2.0 / USB 3.0 enumeration limit. A 2 kΩ RPROG yields ~500 mA (USB 2.0 high power), while ~1.1 kΩ gives the maximum 800 mA (above USB 2.0, requires a dedicated wall adapter). Combine with a TPS2051B power switch or equivalent to handle inrush and fault isolation.
Informations de conformité
The #PBF suffix per Analog Devices / Linear Technology ordering nomenclature indicates lead-free, RoHS-compliant terminal finish. AEC-Q100 not applicable (this is not an automotive-grade part). Halogen-free status not explicitly stated in the verified distributor listings.
