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Analog Devices Inc. LTC3550EDHC-1#PBF
- Part No.:
- LTC3550EDHC-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3550EDHC-1#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,168
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Product details
Overview
LTC3550EDHC-1#PBF from Analog Devices (formerly Linear Technology) is a dual-input Li-ion battery charger with integrated 600mA synchronous buck converter in a 16-lead DFN package. It autonomously selects between wall adapter (DCIN) and USB (USBIN) inputs, delivers up to 800mA charge current, regulates float voltage at 4.2V ±0.6%, and provides fixed 1.875V output for low-power system rails - used in portable medical devices requiring compact, thermally robust power management.
For engineers reviewing the LTC3550EDHC-1#PBF datasheet, LTC3550EDHC-1#PBF pinout, LTC3550EDHC-1#PBF application, or LTC3550EDHC-1#PBF equivalent, this page delivers verified functional architecture, thermal regulation behavior, input source selection logic, termination threshold programming, and validated alternative parts for battery-powered embedded systems.
Technical Context
The LTC3550EDHC-1#PBF integrates two independent power blocks: a linear battery charger with automatic DCIN/USBIN arbitration and thermal foldback at 105°C, and a 1.5MHz constant-frequency current-mode buck regulator with internal P/N-channel MOSFETs. Charge current is set via external resistors on IDC (wall) and IUSB (USB) pins, each servoing to 1.0V in CC mode.
It implements dual undervoltage lockout (UVLO): 4.15V (DCIN, 200mV hysteresis) and 3.95V (USBIN, 200mV hysteresis), plus automatic recharge when battery voltage drops below 4.1V. The buck converter supports Burst Mode® operation, achieving <20µA quiescent current in sleep state while maintaining regulated 1.875V output across 0–600mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Input Sources | Dual independent inputs: DCIN (4.3–8V, 950mA max) and USBIN (4.3–8V, 700mA max), with automatic priority selection |
| Float Voltage Accuracy | 4.2V ±0.6% (±25.2mV) over –40°C to 85°C - ensures safe, precise Li-ion termination without external calibration |
| Buck Output | Fixed 1.875V (±2.8%) at up to 600mA; 1.5MHz switching enables ≤2.2µH inductor and small ceramic output caps |
| Thermal Regulation Threshold | Junction temperature limit of 105°C; dynamically reduces charge current to prevent die overheating during high ambient or high-power operation |
| Shutdown Currents | 20µA (DCIN), 10µA (USBIN when VDCIN > VUSBIN), <2µA (battery drain) - critical for long standby in portable equipment |
| Termination Programmability | ITERM pin accepts resistor (1k–20kΩ) to set termination threshold from 4mA to 110mA - supports diverse battery capacities and safety margins |
| Operating Temperature | –40°C to 85°C ambient; validated performance across full range per design characterization (not just guaranteed) |
Pinout & Package
Package: 16-lead (5mm × 3mm) DFN with exposed thermal pad (Pin 17 = GND), 0.75mm profile, θJA = 40°C/W when pad is soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (16) | Wall adapter input supply | Accepts 4.3–8V; powers charger and enables priority selection; 950mA max continuous current |
| USBIN (1) | USB port input supply | Accepts 4.3–8V; 700mA max; automatically disabled if DCIN is valid and sufficient |
| IDC (14) / IUSB (2) | Charge current programming & monitoring | Each servo to 1.0V in CC mode; current = 1000 × Vpin/Rext; enables real-time current measurement |
| ITERM (3) | Termination threshold programming | Resistor-to-ground sets termination current (4–110mA); clamped at ~1.5V to prevent overdrive |
| ⎯P⎯W⎯R (4) / ⎯C⎯H⎯R⎯G (5) / USBPWR (13) | Open-drain status outputs | ⎯P⎯W⎯R: active-low when any input powered; ⎯C⎯H⎯R⎯G: active-low during charge; USBPWR: high-Z only when USB is sole source |
| BAT (15) | Charger output to battery | Delivers regulated CC/CV charge; integrates thermal feedback loop; connects directly to single-cell Li-ion anode |
| VOUT (6) / SW (10) / VCC (7) | Buck converter interface | VOUT = feedback node; SW = switch node to external inductor; VCC = buck input (2.5–5.5V), decoupled with ≥2.2µF ceramic |
| RUN (11) / ENABLE (12) | Control inputs | RUN: enables/disables buck (1.5V/0.3V thresholds); ENABLE: polarity depends on source (low=DCIN, high=USBIN) |
| GND (8,9,17) | Ground reference & thermal path | Pins 8/9 = signal GND; Pin 17 = exposed pad = mandatory GND connection for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Automatic dual-input power selection | Hardware-based arbitration between DCIN and USBIN using UVLO + ΔV thresholds - no firmware or external logic required |
| Integrated thermal regulation | Dynamically scales charge current to hold die at ≤105°C - eliminates need for external thermal sensors or derating tables |
| No external power components | Internal P/N-channel buck switches, no external sense resistor, blocking diode, or MOSFETs - reduces BOM count and layout area |
| Programmable termination & recharge | Resistor-set termination (4–110mA) and 65–135mV recharge hysteresis - enables precise capacity retention tuning |
| Burst Mode® efficiency optimization | Reduces quiescent current to 20µA at light loads while maintaining tight output regulation - extends battery runtime in sleep states |
Applications
| Portable Medical Monitors | Handheld Diagnostic Tools |
|---|---|
Use Scenario: Battery-powered ECG or pulse oximeter operating 72+ hours between charges, with USB recharging in clinic and wall charging in lab. IC Role / Device Role / Timing Role: LTC3550EDHC-1#PBF manages dual-input Li-ion charging and powers analog front-end and MCU core rail (1.875V) from same battery. Use Value: Thermal regulation prevents overheating during rapid USB charge in confined enclosures; 1.5MHz buck allows ultra-compact 2.2µH inductor. |
Use Scenario: Field-deployable ultrasound probe with hot-swap battery, requiring reliable charge under variable ambient temperatures (–20°C to 55°C). IC Role / Device Role / Timing Role: LTC3550EDHC-1#PBF provides autonomous source selection, ±0.6% float accuracy for cell longevity, and stable 1.875V for FPGA configuration memory. Use Value: Recharge threshold (4.1V) maintains >85% SOC without user intervention; shutdown currents <20µA minimize standby drain. |
| Industrial Handheld Terminals | Wearable Health Trackers |
Use Scenario: Ruggedized warehouse scanner with 24/7 operation, charged via USB-C dock or 12V vehicle adapter. IC Role / Device Role / Timing Role: LTC3550EDHC-1#PBF handles input arbitration, battery protection, and powers 1.875V RF transceiver and display driver ICs. Use Value: 400mΩ (DCIN) / 550mΩ (USBIN) FET RDS(on) minimizes heat rise during 800mA charging; exposed pad ensures thermal reliability in sealed housing. |
Use Scenario: Slim fitness band with 120mAh Li-ion, requiring minimal PCB area and sub-10µA battery drain during multi-week storage. IC Role / Device Role / Timing Role: LTC3550EDHC-1#PBF serves as single-chip power manager - charging, regulation, and status signaling in 5×3mm footprint. Use Value: 2µA battery drain in shutdown preserves charge during shelf life; 16-pin DFN fits tight mechanical constraints without compromising thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input Li-ion charger + buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555ETA+ | Single-input (USB-only) 500mA charger; no buck converter; 4.2V float; no thermal regulation | Only suitable where wall adapter charging is unnecessary and system rail must be generated externally | Select only if USB-only input suffices and discrete 1.8V LDO/buck is already in design |
| BQ24075RGTR | USB-only 1A charger with integrated LDO (3.3V/100mA); no buck converter; no thermal foldback; no dual-source arbitration | Applicable for cost-sensitive USB-charged devices needing basic 3.3V rail, not 1.875V or thermal management | Choose when 3.3V system rail is acceptable and thermal derating is handled at board level |
Compared with MAX1555ETA+ and BQ24075RGTR, the LTC3550EDHC-1#PBF uniquely combines dual-input autonomy, integrated 600mA buck, and die-temperature-based charge current control - enabling smaller, safer, and more flexible power architectures without external supervision.
Availability
LTC3550EDHC-1#PBF is available at Aetrix Electronics and suitable for portable medical monitors, handheld diagnostic tools, industrial terminals, wearable health trackers, and battery-backed IoT edge nodes requiring stable component supply with long-term manufacturability.
Supply support for LTC3550EDHC-1#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial, automotive, and healthcare markets.
The LTC3550EDHC-1#PBF belongs to Linear's Power Management family, engineered specifically for space-constrained, battery-operated portable electronics requiring seamless dual-input charging and efficient on-board regulation without external FETs or compensation.
FAQ
What input voltage ranges does the LTC3550EDHC-1#PBF support for DCIN and USBIN?
The LTC3550EDHC-1#PBF supports DCIN from 4.3V to 8V and USBIN from 4.3V to 8V, with absolute maximum ratings of –0.3V to 10V on both pins. Its UVLO thresholds are 4.15V (DCIN, 200mV hysteresis) and 3.95V (USBIN, 200mV hysteresis), ensuring reliable startup across compliant wall adapters and USB sources. These values are confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
How is charge current programmed on the LTC3550EDHC-1#PBF?
Charge current is independently programmed using external resistors: RIDC on the IDC pin (Pin 14) for wall adapter input, and RIUSB on the IUSB pin (Pin 2) for USB input. In constant-current mode, each pin servos to 1.0V, so IBAT = 1000 × (1.0V / Rext). For example, RIDC = 1.25kΩ sets 800mA from DCIN. This method is explicitly defined in the "Pin Functions" section and verified by Figure 1 and Table 1 in the datasheet.
Does the LTC3550EDHC-1#PBF provide thermal regulation, and how does it work?
Yes, the LTC3550EDHC-1#PBF features internal thermal regulation that activates when junction temperature approaches 105°C. It dynamically reduces the programmed charge current to maintain die temperature at or below this threshold - preventing overheating during high ambient conditions or high-power charging. This behavior is documented in the "Features" list, "Thermal Limiting" section, and confirmed by Figure G10 (Charge Current vs Ambient Temperature) in the datasheet.
What is the purpose of the ITERM pin on the LTC3550EDHC-1#PBF, and how is it used?
The ITERM pin (Pin 3) programs the charge termination threshold current using a resistor to ground. ITERMINATE = 100 × (1.0V / RITERM), supporting values from 4mA to 110mA depending on resistor choice (1kΩ to 20kΩ). When battery current falls below this threshold in constant-voltage mode, charging stops and the ⎯C⎯H⎯R⎯G pin goes high-impedance. This function is fully specified in the Electrical Characteristics table and "Pin Functions" description.
Can the LTC3550EDHC-1#PBF operate with only USB power, and what happens to the buck converter?
Yes, the LTC3550EDHC-1#PBF operates with USBIN only when DCIN is absent or invalid. The buck converter remains fully functional as long as VCC (Pin 7) is supplied - which can be derived from BAT (via internal path) or externally. The RUN pin (Pin 11) controls buck enable independently; with RUN high, the 1.875V output is active regardless of input source. This dual-source independence is confirmed in the "Battery Charger Power Source Selection" and "600mA Step-Down Regulator" sections of the datasheet.
LTC3550EDHC-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- Over Voltage, Short Circuit
- 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:
- 16-DFN (5x3)
LTC3550EDHC-1#PBF FAQ
1.How can I place an order for LTC3550EDHC-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3550EDHC-1#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 LTC3550EDHC-1#PBF reliable?
The price and inventory of LTC3550EDHC-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3550EDHC-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3550EDHC-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3550EDHC-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3550EDHC-1#PBF?
LTC3550EDHC-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3550EDHC-1#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 LTC3550EDHC-1#PBF?
For technical support, including LTC3550EDHC-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3550EDHC-1#PBF requirements.
6.How does Aetrix verify that LTC3550EDHC-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3550EDHC-1#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 LTC3550EDHC-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3550EDHC-1#PBF?
All LTC3550EDHC-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3550EDHC-1#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 LTC3550EDHC-1#PBF part is unused and in its original packaging.
Return procedure for LTC3550EDHC-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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