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Analog Devices Inc. LTC4057ES5-4.2#TRPBF
- Part No.:
- LTC4057ES5-4.2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC4057ES5-4.2#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
LTC4057ES5-4.2#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic linear lithium-ion battery charger IC designed for single-cell 4.2V Li-Ion batteries in space-constrained portable devices. It integrates a P-channel power MOSFET, thermal regulation, ±1% float voltage accuracy, programmable charge current up to 800mA via external resistor, and USB-compliant input operation (4.25V–6.5V). It enables direct USB-port charging without external sense resistor, blocking diode, or discrete FET.
For engineers reviewing the LTC4057ES5-4.2#TRPBF datasheet, LTC4057ES5-4.2#TRPBF pinout, LTC4057ES5-4.2#TRPBF application, or LTC4057ES5-4.2#TRPBF equivalent, key selection considerations include thermal regulation behavior at 120°C junction limit, PROG-pin-based current programming and monitoring, shutdown mode supply current (25µA), trickle-charge threshold (2.9V), and SOT-23-5 package compatibility with high-density PCB layouts.
Technical Context
The LTC4057ES5-4.2#TRPBF implements a constant-current/constant-voltage (CC/CV) charge algorithm with integrated thermal feedback that dynamically reduces charge current when die temperature approaches 120°C. Its internal architecture eliminates need for external current-sense resistor or blocking diode by integrating a low-RDS(ON) (600mΩ typical) P-channel MOSFET between VCC and BAT pins.
Charge termination is not autonomous: it relies on external circuitry or host monitoring of the PROG pin voltage (1.0V ±7% in CC mode) to infer current decay during CV phase. Trickle charging activates below 2.9V battery voltage, delivering ~10% of programmed current until threshold is exceeded, enabling safe recovery of deeply discharged cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Preset 4.2V ±1% float voltage - ensures safe full-charge termination for standard single-cell Li-Ion without external voltage-setting components. |
| Max Charge Current | Programmable up to 800mA via RPROG - supports fast charging of 1000–2000mAh batteries while maintaining thermal safety under proper PCB layout. |
| Input Voltage Range | 4.25V to 6.5V - compliant with USB 2.0 (5V±5%) and common wall adapters; includes 3.8V UVLO with 200mV hysteresis. |
| Shutdown Supply Current | 25µA - minimizes system standby power loss when SHDN pin is pulled low or VCC drops near VBAT. |
| Thermal Regulation Threshold | Junction temperature limit of 120°C - automatically scales back charge current to prevent overheating without external thermal sensors. |
| Trickle Charge Threshold | 2.9V ±0.1V with 80mV hysteresis - initiates low-current pre-charge for batteries below safe CV/CC entry voltage. |
| PROG Pin Voltage (CC Mode) | 1.0V ±7% - enables real-time charge current monitoring using IBAT = (VPROG/RPROG) × 1000, with built-in 2.4V clamp protection. |
Pinout & Package
Package: 5-lead TSOT-23 (S5), 1mm height, JEDEC MO-193 compliant. Exposed pad not present; thermal path relies on copper pour connected to GND pin (Pin 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled shutdown input | Pulling below 0.4V disables charging, reduces supply current to 25µA and battery drain to <2µA; internal 1MΩ pull-down ensures default active state. |
| GND (Pin 2) | Power and signal reference ground | Primary thermal conduction path; must be connected to large copper area for effective heat dissipation and stable regulation. |
| BAT (Pin 3) | Charge output and voltage regulation node | Delivers regulated 4.2V float voltage to battery; internal precision divider sets voltage; disconnected in shutdown to prevent battery leakage. |
| VCC (Pin 4) | Main power input | Accepts 4.25–6.5V; requires ≥1µF bypass capacitor; enters shutdown if VCC falls within 30mV of BAT voltage to block reverse current. |
| PROG (Pin 5) | Current programming and monitoring interface | Connect RPROG to GND to set charge current; voltage servoed to 1.0V in CC mode; used to calculate real-time IBAT and detect CV transition. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFET | Eliminates external pass transistor and associated gate-drive complexity; RDS(ON) = 600mΩ enables efficient 800mA charging with minimal board area. |
| USB-Compatible Input Stage | Operates directly from 5V USB ports without level-shifting or overvoltage protection ICs; includes undervoltage lockout and reverse-current prevention. |
| Thermal Regulation Loop | Die-temperature-based current limiting prevents thermal runaway without external sensors; allows aggressive charge profiles on thermally optimized PCBs. |
| Soft-Start Circuitry | Ramps charge current over ~100µs to suppress inrush transients on VCC supply, protecting upstream USB port or adapter from current surges. |
| Low-Power Shutdown Mode | Reduces total system quiescent current to 25µA while maintaining battery isolation (<2µA drain), critical for long-term storage in portable electronics. |
Applications
| Wireless Handhelds | USB-Powered Portable Instruments |
|---|---|
Use Scenario: Compact handheld scanner powered solely by micro-USB input with no AC adapter. IC Role / Device Role / Timing Role: Primary linear battery charger managing CC/CV profile, thermal foldback, and USB power negotiation compliance. Use Value: Enables full 800mA charging from 5V USB without external FET or sense resistor, reducing BOM count by 3 components and PCB footprint by >3mm². | Use Scenario: Battery-backed digital multimeter with automatic recharge when connected to PC via USB. IC Role / Device Role / Timing Role: Autonomous charge controller with trickle-to-CC-to-CV sequencing and low-quiescent shutdown during host disconnection. Use Value: Maintains <2µA battery drain in disconnected state and resumes charging within 10ms of VCC application, extending shelf life and field usability. |
| Wearable Health Monitors | Compact Bluetooth Audio Devices |
Use Scenario: Skin-contact ECG patch with sealed Li-Ion cell and micro-USB maintenance port. IC Role / Device Role / Timing Role: Safety-critical charger enforcing ±1% 4.2V float voltage and thermal cutoff at 120°C to prevent cell swelling or venting. Use Value: Meets IEC 62368-1 thermal limits without external thermistor; PROG pin monitoring enables firmware-based charge progress tracking. | Use Scenario: True wireless stereo earbuds case with dual-bay charging and USB-C input. IC Role / Device Role / Timing Role: Dual-channel charge management (one per bay) using two LTC4057ES5-4.2#TRPBF in parallel with independent PROG resistors. Use Value: Achieves simultaneous 500mA charging per cell using identical SOT-23-5 footprints, simplifying layout and inventory vs. multi-cell controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li-Ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4054ES5-4.2#TRPBF | Standalone version with C/10 charge termination and integrated timer; no SHDN pin; same 4.2V float and SOT-23-5 package. | Used where autonomous charge cutoff is required without host MCU intervention; lacks programmable current and shutdown control. | Select LTC4054ES5-4.2#TRPBF only if C/10 termination suffices and PROG-based current tuning or logic-controlled shutdown is unnecessary. |
| LTC4053EDD-4.2#TRPBF | Higher 1.25A max charge current; 10-lead DFN package; includes USB enumeration and power-path management; requires external sense resistor. | Suitable for higher-capacity batteries and systems needing simultaneous USB peripheral power + charging; adds complexity and cost. | Choose LTC4053EDD-4.2#TRPBF when >800mA current or USB suspend/resume signaling is mandatory; avoid if SOT-23-5 size or zero-external-component simplicity is critical. |
Compared with LTC4054ES5-4.2#TRPBF, the LTC4057ES5-4.2#TRPBF offers programmable current and active shutdown but requires external termination logic; versus LTC4053EDD-4.2#TRPBF, it trades higher current and USB features for smaller size, lower cost, and simpler integration in ultra-compact USB-charged devices.
Availability
LTC4057ES5-4.2#TRPBF is available at Aetrix Electronics and suitable for wireless PDAs, cellular phones, and portable medical monitors requiring stable component supply across extended production lifecycles.
Supply support for LTC4057ES5-4.2#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio. Linear's legacy ICs are fully supported with datasheets, SPICE models, and application notes.
The LTC4057ES5-4.2#TRPBF belongs to Linear's ThinSOT™ linear battery charger family, engineered specifically for USB-powered portable electronics where minimal external components, thermal robustness, and strict 4.2V Li-Ion compliance are mandatory.
FAQ
What is the maximum charge current achievable with LTC4057ES5-4.2#TRPBF?
The LTC4057ES5-4.2#TRPBF supports programmable charge current up to 800mA, achieved by selecting an appropriate RPROG value (e.g., 1.25kΩ yields ~800mA). This maximum assumes optimal thermal design (θJA ≤ 125°C/W) and ambient temperature ≤48°C. At higher temperatures or poorer PCB thermal layout, thermal regulation will reduce current to maintain 120°C junction limit. The LTC4057ES5-4.2#TRPBF does not support currents beyond 800mA even with external cooling.
Does LTC4057ES5-4.2#TRPBF support autonomous charge termination?
No, the LTC4057ES5-4.2#TRPBF does not provide autonomous charge termination. It lacks built-in timers or C/10 detection circuitry. Termination must be implemented externally-typically by monitoring PROG pin voltage decay during constant-voltage phase or using a host microcontroller to detect current drop below threshold. For standalone termination, consider the pin-compatible LTC4054ES5-4.2#TRPBF, which integrates C/10 detection and timer functionality.
Can LTC4057ES5-4.2#TRPBF be used with input sources below 4.25V?
No, the LTC4057ES5-4.2#TRPBF has a minimum input voltage specification of 4.25V. Operation below this threshold triggers undervoltage lockout (UVLO), preventing charging. This is intentional to ensure sufficient headroom for the internal P-MOSFET's RDS(ON) drop and maintain regulation accuracy across temperature. Using a 3.3V or 3.7V source is not supported; for lower-input applications, consider buck-boost chargers like the LTC4121 or external DC-DC pre-regulation.
How does thermal regulation behave in LTC4057ES5-4.2#TRPBF during high ambient temperature?
Thermal regulation in the LTC4057ES5-4.2#TRPBF activates when die temperature approaches 120°C, dynamically scaling back charge current to hold junction temperature constant. The reduction follows IBAT = (120°C − TA) / [(VCC − VBAT) × θJA], where θJA depends on PCB copper area. At 60°C ambient with 4.5V input and 3.7V battery, current drops to ~500mA (vs. 600mA at 25°C). The LTC4057ES5-4.2#TRPBF continues charging at reduced rate rather than halting, ensuring battery completion under thermal stress.
What is the purpose of the SHDN pin on LTC4057ES5-4.2#TRPBF, and what voltage levels activate it?
SHDN (Pin 1) provides logic-controlled shutdown: pulling it below 0.4V (VSHDN-IL) forces the LTC4057ES5-4.2#TRPBF into shutdown mode, reducing supply current to 25µA and battery drain to <2µA. Releasing SHDN (or driving >1.0V) resumes charging. An internal 1MΩ pull-down ensures default activation when unconnected. This pin enables system-level power management-e.g., disabling charging during MCU sleep or USB suspend-without removing input power. The LTC4057ES5-4.2#TRPBF remains responsive to VCC UVLO and thermal events even in shutdown.
LTC4057ES5-4.2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 800mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6.5V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC4057ES5-4.2#TRPBF FAQ
1.How can I place an order for LTC4057ES5-4.2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4057ES5-4.2#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC4057ES5-4.2#TRPBF reliable?
The price and inventory of LTC4057ES5-4.2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4057ES5-4.2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4057ES5-4.2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4057ES5-4.2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4057ES5-4.2#TRPBF?
LTC4057ES5-4.2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4057ES5-4.2#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC4057ES5-4.2#TRPBF?
For technical support, including LTC4057ES5-4.2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4057ES5-4.2#TRPBF requirements.
6.How does Aetrix verify that LTC4057ES5-4.2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4057ES5-4.2#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC4057ES5-4.2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4057ES5-4.2#TRPBF?
All LTC4057ES5-4.2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4057ES5-4.2#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC4057ES5-4.2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4057ES5-4.2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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