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Analog Devices Inc. LTC4052EMS8E-4.2#PBF
- Part No.:
- LTC4052EMS8E-4.2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC4052EMS8E-4.2#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC4052EMS8E-4.2 from Analog Devices (formerly Linear Technology) is a standalone 1-cell lithium-ion pulse charger IC with integrated 0.35Ω N-MOSFET, ±1% 4.2V float voltage accuracy, programmable timer-based charge termination, and C/10 near-end-of-charge detection. It operates from 4.5V to 10V input, delivers up to 1A charge current, and targets compact portable devices requiring minimal external components.
For engineers reviewing the LTC4052EMS8E-4.2 datasheet, LTC4052EMS8E-4.2 pinout, LTC4052EMS8E-4.2 application, or LTC4052EMS8E-4.2 equivalent, key selection criteria include its integrated MOSFET eliminating blocking diodes, external sense resistor–based overcurrent protection, thermal shutdown, automatic trickle/refresh charging, and MSOP-8 exposed-pad package for thermal management.
Technical Context
The LTC4052EMS8E-4.2 implements a constant-current/constant-voltage (CC/CV) pulse charging algorithm using an internal charge pump–driven N-MOSFET switch. It monitors battery voltage via the BAT pin and controls gate drive through the GATE pin with slew-rate control enabled by an external RC network.
Charge state is signaled via open-drain CHRG (C/10 detection) and ACPR (wall adapter presence) outputs. Overcurrent protection triggers immediate GATE shutdown and 640ms retry cycles when VSENSE exceeds 105mV. A programmable CTIMER capacitor sets total charge time, minimum on/off durations, and overcurrent timeout periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.200 V ±1% - Ensures precise full-charge cutoff for Li-ion cells without overvoltage stress. |
| Max Charge Current | 1 A - Supported with external RSENSE = 0.05Ω; enables fast charging in space-constrained designs. |
| Overcurrent Threshold | 105 mV - Triggers immediate GATE shutdown if sensed voltage exceeds this level, protecting battery and IC. |
| Trickle Charge Threshold | 2.45 V - Initiates 24 mA pre-charge mode for deeply discharged batteries below this voltage. |
| Timer Accuracy | ±10% - Determines total charge duration, minimum on/off times, and overcurrent retry period scaling. |
| Quiescent Input Current | 0.7–1.4 mA - Minimizes power draw during active charging; drops to <1 µA in sleep mode when VIN removed. |
| Thermal Shutdown | 140°C - Protects die integrity under sustained high-power dissipation; 5°C hysteresis prevents oscillation. |
Pinout & Package
The LTC4052EMS8E-4.2 is housed in an 8-pin thermally enhanced MSOP package (MS8E) with an exposed copper pad soldered to PCB ground for optimal heat dissipation (θJA = 35°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE (1) | Current sense input | Connects to external RSENSE to set overcurrent limit; short to VIN disables protection. |
| ACPR (2) | AC adapter present output | Open-drain signal pulled low when VIN > VBAT + 45mV; includes 100ms filter for noise immunity. |
| VIN (3) | Positive input supply | Accepts 4.5V–10V wall adapter input; requires 1µF bypass capacitor with 4.7Ω series resistor. |
| GND (4) | Ground reference & thermal path | Electrical ground and primary thermal conduction path; exposed pad must be soldered to PCB copper. |
| TIMER (5) | Charge timer programming | Capacitor-to-ground sets total charge time: tTIMER = (CTIMER × 3 hr)/0.1µF. |
| CHRG (6) | Charge status output | Three-state open-drain: strong pulldown (charging), weak 40µA pulldown (C/10 reached), high-Z (not charging). |
| GATE (7) | Internal MOSFET gate driver | Drives internal 0.35Ω N-MOSFET; supports external FET parallel operation; clamped to 12V above GND. |
| BAT (8) | Battery voltage sense | Internally divided to set 4.2V float; clamped to 4.7V if battery disconnected; triggers recharge at 4.05V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.35Ω N-MOSFET | Eliminates need for external pass transistor and blocking diode, reducing BOM count and forward voltage drop. |
| Programmable C/10 detection | Indicates near-full charge via CHRG pin's weak 40µA pulldown, enabling host MCU to optimize system power states. |
| Automatic battery refresh | Reinitiates charging when VBAT falls below 4.05V post-termination, maintaining cell readiness without user intervention. |
| Thermal shutdown with hysteresis | Disables charging at ~140°C and resumes only after cooling by ≥5°C, preventing thermal runaway in enclosed environments. |
| Low sleep-mode battery drain | Leakage current <1 µA when VIN is removed, preserving battery capacity during device storage or standby. |
Applications
| Handheld Computers | Cellular Telephones |
|---|---|
|
Use Scenario: Compact tablet or ruggedized PDA with single-cell Li-ion battery and no onboard microcontroller. IC Role / Device Role / Timing Role: Standalone CC/CV pulse charger managing full charge cycle, trickle start, and C/10 indication without firmware. Use Value: Reduces bill-of-materials by integrating MOSFET and eliminating blocking diode, while maintaining ±1% voltage accuracy for cell longevity. |
Use Scenario: Feature phone or entry-level smartphone requiring reliable, low-cost charging from USB or wall adapter. IC Role / Device Role / Timing Role: Primary battery management IC providing overcurrent protection, thermal safety, and automatic recharge on voltage sag. Use Value: Enables safe 1A charging with <350mW dissipation at full load, leveraging MSOP-8 thermal pad for passive cooling in thin form factors. |
| Cradle Chargers | Portable Medical Monitors |
|
Use Scenario: Docking station that charges multiple handheld devices simultaneously using shared wall adapter. IC Role / Device Role / Timing Role: Dedicated charger per device slot, using ACPR pin to confirm adapter presence and CHRG for status feedback. Use Value: Prevents reverse battery current flow if cradle input shorts to ground, removing need for discrete reverse-blocking diodes per channel. |
Use Scenario: Battery-powered ECG or glucose meter requiring long shelf life and guaranteed first-use readiness. IC Role / Device Role / Timing Role: Maintains battery at optimal 4.2V float while automatically refreshing when self-discharge drops voltage below 4.05V. Use Value: Achieves <1 µA sleep current to extend unused battery life beyond 12 months, critical for infrequently used medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone Li-ion battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4054ES5-4.2#TRMPBF | ThinSOT-5 package; fixed 800mA charge current; no external RSENSE; no ACPR output. | Targeted at ultra-compact, lower-current applications where board area is more constrained than current capability. | Select LTC4054 for space-limited designs needing ≤800mA and simplified layout; avoid if ACPR signaling or >1A current is required. |
| LTC1731EMS8-4.2#PBF | CC/CV controller (no integrated MOSFET); requires external pass transistor; supports thermistor interface. | Suitable for temperature-monitored charging in harsh environments where thermal regulation is mandatory. | Choose LTC1731 when battery temperature sensing is required or higher current (>1A) with external FET is needed; not drop-in compatible. |
Compared with LTC4052EMS8E-4.2, the LTC4054 offers smaller footprint but sacrifices current headroom and adapter-detection capability, while the LTC1731 adds thermal control flexibility at the cost of increased component count and design complexity.
Availability
LTC4052EMS8E-4.2 is available at Aetrix Electronics and suitable for handheld computers, cellular telephones, and cradle chargers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC4052EMS8E-4.2 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 product lines with full technical documentation and long-term manufacturing commitment.
The LTC4052EMS8E-4.2 belongs to Linear's legacy standalone Li-ion charger family, designed specifically for cost-sensitive, microcontroller-free portable electronics needing robust, integrated charging with minimal external components.
FAQ
What is the maximum input voltage rating for the LTC4052EMS8E-4.2?
The LTC4052EMS8E-4.2 has an absolute maximum input supply voltage (VIN) rating of 12V. Its recommended operating range is 4.5V to 10V, aligning with standard wall adapters and USB-compliant sources. Exceeding 12V risks permanent damage to the internal charge pump and gate driver circuitry, as specified in the Absolute Maximum Ratings table.
How does the LTC4052EMS8E-4.2 implement overcurrent protection?
The LTC4052EMS8E-4.2 uses an external sense resistor (RSENSE) between VIN and the SENSE pin to monitor charge current. When the voltage across RSENSE exceeds 105mV (typical), the internal MOSFET immediately turns off, pulling GATE low. After a 640ms timeout (set by CTIMER = 0.1µF), it retries-repeating until timer expiration or condition clears.
Can the LTC4052EMS8E-4.2 charge a battery without a microcontroller?
Yes-the LTC4052EMS8E-4.2 is a fully standalone charger. It autonomously manages trickle charge (for VBAT < 2.45V), constant-current charging, CV regulation at 4.2V, C/10 detection, timer-based termination, and automatic refresh-all without firmware or external logic. The CHRG and ACPR pins provide status signals for optional host monitoring.
What thermal considerations apply to the LTC4052EMS8E-4.2 in 1A operation?
At 1A and VBAT = 4V, the LTC4052EMS8E-4.2 dissipates ~0.353W. With its MS8E package's θJA ≈ 35°C/W and 75°C ambient, junction temperature reaches ~97°C-well below the 125°C limit. Successful thermal design requires soldering the exposed pad to ≥1 cm² of 2oz copper with ≥4 thermal vias to inner/ground layers.
Is the LTC4052EMS8E-4.2 compatible with batteries requiring 4.35V float voltage?
No-the LTC4052EMS8E-4.2 is factory-trimmed for 4.200V ±1% float voltage and cannot be adjusted. It is intended exclusively for standard 4.2V Li-ion cells. For 4.35V or other voltages, consider alternatives like the LTC4053 (USB-compatible, adjustable) or LTC4057 (programmable via resistor divider), as confirmed in Linear's related parts table.
LTC4052EMS8E-4.2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant, Pulsed
- Programmable Features:
- Timer
- Fault Protection:
- Over Current
- Charge Current - Max:
- 1A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 10V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC4052EMS8E-4.2#PBF FAQ
1.How can I place an order for LTC4052EMS8E-4.2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4052EMS8E-4.2#PBF 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 LTC4052EMS8E-4.2#PBF reliable?
The price and inventory of LTC4052EMS8E-4.2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4052EMS8E-4.2#PBF is usually 5 days.
3.What payment methods are accepted for LTC4052EMS8E-4.2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4052EMS8E-4.2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4052EMS8E-4.2#PBF?
LTC4052EMS8E-4.2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4052EMS8E-4.2#PBF 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 LTC4052EMS8E-4.2#PBF?
For technical support, including LTC4052EMS8E-4.2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4052EMS8E-4.2#PBF requirements.
6.How does Aetrix verify that LTC4052EMS8E-4.2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4052EMS8E-4.2#PBF 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 LTC4052EMS8E-4.2#PBF meets industry standards.
7.What is the process for return or replacement of LTC4052EMS8E-4.2#PBF?
All LTC4052EMS8E-4.2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4052EMS8E-4.2#PBF, 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 LTC4052EMS8E-4.2#PBF part is unused and in its original packaging.
Return procedure for LTC4052EMS8E-4.2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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