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Analog Devices Inc. LTC4077EDD#PBF
- Part No.:
- LTC4077EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4077EDD#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,154
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Product details
Overview
LTC4077EDD#PBF from Analog Devices (formerly Linear Technology) is a dual-input standalone linear Li-Ion battery charger IC that autonomously selects between wall adapter (DCIN) and USB (USBIN) power sources. It delivers up to 800 mA from DCIN and 500 mA from USBIN, features ±0.6% 4.2 V float voltage regulation, thermal feedback limiting at ~105°C, and C/10 charge termination. It is used in portable consumer electronics requiring compact, dual-source battery charging with minimal external components.
For engineers reviewing the LTC4077EDD#PBF datasheet, LTC4077EDD#PBF pinout, LTC4077EDD#PBF application, or LTC4077EDD#PBF equivalent, key selection criteria include dual-input source arbitration logic, programmable charge current via IDC/IUSB/IUSBL pins, open-drain CHRG/PWR status outputs, thermal regulation behavior, and shutdown current specs (20 µA DCIN / 10 µA USBIN).
Technical Context
The LTC4077EDD#PBF implements a constant-current/constant-voltage (CC/CV) charging algorithm for single-cell Li-Ion batteries, with independent current programming paths for DCIN (IDC pin, 1 V servo), USB high-power (IUSB pin, 1 V servo), and USB low-power (IUSBL pin, 0.2 V servo). Input selection is fully autonomous based on UVLO thresholds (DCIN: 4.15 V, USBIN: 3.95 V) and relative input-to-battery voltage margins (≥180 mV rising).
Thermal regulation operates via internal die temperature sensing, reducing charge current when junction temperature approaches 105°C. Charge termination uses filtered comparator monitoring of program pin voltages (100 mV threshold, 1.5 ms filter time), with C/10 termination for DCIN/USB high-power and C/2 for USB low-power modes. Trickle charge activates below 2.9 V BAT, and automatic recharge triggers at ~4.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Algorithm | CC/CV with C/10 (DCIN/USB HPWR) or C/2 (USB LPWR) termination and 6 ms recharge hysteresis |
| Float Voltage | 4.2 V ±0.6% - ensures safe full-charge state for standard Li-Ion cells without overvoltage risk |
| Max Charge Current | 800 mA from DCIN (RIDC = 1.24 kΩ); 500 mA from USBIN (RIUSB = 2 kΩ, HPWR = high) |
| Input Voltage Range | DCIN/USBIN: 4.3 V to 8 V - supports standard 5 V USB and 5–6 V wall adapters |
| Thermal Regulation Threshold | Junction temperature ~105°C - dynamically scales back current to prevent overheating on PCBs with θJA ≈ 40°C/W |
| Shutdown Supply Current | 20 µA (DCIN), 10 µA (USBIN when VDCIN > VUSBIN) - enables ultra-low standby power in battery-backed systems |
| Trickle Charge Threshold | 2.9 V BAT with 100 mV hysteresis - safely conditions deeply discharged cells before full-rate charging |
Pinout & Package
The LTC4077EDD#PBF is housed in a thermally enhanced, low-profile (0.75 mm) 10-lead 3 mm × 3 mm DFN package with exposed pad (Pin 11) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (10) | Wall adapter input supply | Accepts 4.3–8 V; supports up to 950 mA input; requires 1 µF bypass capacitor |
| USBIN (1) | USB input supply | Accepts 4.3–8 V; supports up to 650 mA input; requires 1 µF bypass capacitor |
| IDC (8) | DC charge current program | Servos to 1 V in CC mode; sets DCIN current via RIDC = 1000 / ICHRG (Ω) |
| IUSB (2) | USB high-power current program | Servos to 1 V in CC mode; sets USBIN current (HPWR = high) via RIUSB = 1000 / ICHRG (Ω) |
| IUSBL (3) | USB low-power current program | Servos to 0.2 V in CC mode; sets USBIN current (HPWR = low) via RIUSBL = 200 / ICHRG (Ω) |
| BAT (9) | Charger output to battery | Delivers regulated 4.2 V float; connects directly to single-cell Li-Ion anode |
| HPWR (7) | USB power mode select | Logic high enables IUSB programming; logic low enables IUSBL programming; internal 2 MΩ pulldown |
| EN (6) | Charge enable control | Logic low enables charging; floating defaults to enabled via internal 2 MΩ pulldown |
| PWR (4) | Open-drain power status | Pulled low when DCIN or USBIN exceeds UVLO and is ≥180 mV above BAT; sinks ≤10 mA |
| CHRG (5) | Open-drain charge status | Pulled low during active charging; high-impedance at termination or shutdown; sinks ≤10 mA |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input autonomous source selection | Eliminates need for external power-path controllers or manual switching; prioritizes DCIN when both inputs are valid |
| Integrated P-channel MOSFETs with no external sense resistor | Reduces BOM count and PCB area; avoids accuracy loss and power loss from discrete sense resistors |
| Programmable USB high/low power modes via HPWR pin | Enables compliance with USB 2.0 (500 mA) and USB Battery Charging 1.2 (1.5 A) specifications using same hardware |
| Thermal regulation with die-temperature feedback | Allows aggressive charge current design without thermal runaway risk; adapts current in real time based on PCB thermal performance |
| Open-drain status outputs with 10 mA sink capability | Directly drives LEDs without external transistors; simplifies user interface implementation for power/charge indication |
Applications
| Cellular Telephones | Handheld Computers |
|---|---|
Use Scenario: Compact smartphone with dual charging inputs (USB-C and proprietary wall adapter) and space-constrained layout. IC Role / Device Role / Timing Role: Standalone dual-input Li-Ion charger managing CC/CV profile, source arbitration, and status signaling. Use Value: Enables seamless transition between USB and wall power without firmware intervention; thermal regulation prevents overheating during fast charging in thin form factors. | Use Scenario: Ruggedized industrial handheld with removable battery and field-replaceable power options. IC Role / Device Role / Timing Role: Primary battery management IC handling trickle, fast, and maintenance charging across variable input sources. Use Value: Automatic recharge at ~4.1 V maintains battery readiness; low shutdown current (<2 µA battery drain) extends shelf life during storage. |
| Portable MP3 Players | Digital Cameras |
Use Scenario: Consumer audio player with micro-USB port and proprietary charger dock. IC Role / Device Role / Timing Role: Dual-input linear charger providing precise 4.2 V float and C/10 termination for long cycle life. Use Value: ±0.6% float voltage accuracy preserves cell longevity; IUSBL pin enables safe 100 mA USB-only charging when HPWR = low. | Use Scenario: DSLR or mirrorless camera with USB-powered operation and battery hot-swap capability. IC Role / Device Role / Timing Role: High-current (800 mA) wall-adapter charger with robust undervoltage lockout and power-status signaling. Use Value: VUVDC = 4.15 V and VASD-DC = 180 mV ensure stable charging even with aging wall adapters; PWR output confirms valid input before enabling system power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input Li-Ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Single-input (USB only); no DCIN path; fixed 4.2 V float; no HPWR-selectable USB current modes | Lacks autonomous dual-source selection; suitable only for USB-powered devices without wall adapter support | Select when design uses USB exclusively and requires smaller footprint (16-pin QFN vs. 10-pin DFN) |
| MAX1555ESA+ | Fixed 4.2 V float; no thermal regulation; no programmable USB current; 100 mA max USB charge current | No thermal feedback or high-current USB capability; limited to low-power legacy USB 1.1 applications | Select only for cost-sensitive, low-power designs where thermal headroom is guaranteed and USB current ≤100 mA suffices |
Compared with BQ24075RGTR and MAX1555ESA+, the LTC4077EDD#PBF uniquely supports autonomous dual-input selection, thermal regulation up to 800 mA, and HPWR-configurable USB current-making it optimal for modern portable devices requiring flexible, robust, and space-efficient charging.
Availability
LTC4077EDD#PBF is available at Aetrix Electronics and suitable for cellular telephones, handheld computers, and portable MP3 players requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LTC4077EDD#PBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC4077EDD#PBF belongs to Linear's precision battery charger IC product line, designed specifically for space-constrained portable electronics needing reliable, dual-input, thermally aware Li-Ion charging without microcontroller supervision.
FAQ
What is the exact float voltage accuracy of the LTC4077EDD#PBF, and over what conditions is it specified?
The LTC4077EDD#PBF provides a regulated float voltage of 4.2 V with ±0.6% accuracy under conditions of IBAT = 1 mA, ambient temperature from 0°C to 85°C, and supply voltage between 4.3 V and 8 V. This specification ensures safe, repeatable full-charge termination for standard single-cell Li-Ion batteries without requiring external calibration or trimming.
How does the LTC4077EDD#PBF determine which input source (DCIN or USBIN) to use when both are present?
The LTC4077EDD#PBF automatically selects the wall adapter (DCIN) when its voltage exceeds 4.15 V and remains at least 180 mV above the battery voltage; otherwise, it defaults to USBIN if its voltage exceeds 3.95 V and is ≥180 mV above BAT. The open-drain PWR output reflects this decision by pulling low only when a valid source is selected and active.
Can the LTC4077EDD#PBF be used without connecting the HPWR pin, and what is the resulting USB charge behavior?
Yes - the HPWR pin has an internal 2 MΩ pulldown resistor, so leaving it unconnected defaults it to logic low. In this state, the LTC4077EDD#PBF uses the IUSBL pin (0.2 V servo) to set USB charge current, enabling low-power USB mode (e.g., 100 mA with RIUSBL = 2 kΩ) compliant with basic USB enumeration requirements.
What is the minimum battery voltage required to exit trickle charge mode on the LTC4077EDD#PBF?
The LTC4077EDD#PBF exits trickle charge mode when the BAT pin voltage rises above 2.9 V, with 100 mV hysteresis (i.e., re-enters trickle mode only if BAT falls below 2.8 V). During trickle, it delivers 1/10th the full DCIN current or 1/2 the programmed USB low-power current - ensuring safe conditioning of deeply discharged cells before full-rate charging resumes.
Does the LTC4077EDD#PBF require external compensation components for stability, and what is recommended when the battery is disconnected?
No external compensation is required when a battery is connected - the CC/CV loop is inherently stable. However, when the battery is disconnected, a 1 µF capacitor with a 1 Ω series resistor is recommended at the BAT pin to suppress ripple and maintain loop stability, preventing oscillation or false termination due to capacitive loading effects.
LTC4077EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- -
- Charge Current - Max:
- 950mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 8V
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4077EDD#PBF FAQ
1.How can I place an order for LTC4077EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4077EDD#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 LTC4077EDD#PBF reliable?
The price and inventory of LTC4077EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4077EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4077EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4077EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4077EDD#PBF?
LTC4077EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4077EDD#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 LTC4077EDD#PBF?
For technical support, including LTC4077EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4077EDD#PBF requirements.
6.How does Aetrix verify that LTC4077EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4077EDD#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 LTC4077EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4077EDD#PBF?
All LTC4077EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4077EDD#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 LTC4077EDD#PBF part is unused and in its original packaging.
Return procedure for LTC4077EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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