My Inquiry
My Account
Analog Devices Inc. LTC3550EDHC#PBF
- Part No.:
- LTC3550EDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3550EDHC#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,659
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3550EDHC#PBF from Analog Devices (formerly Linear Technology) is a dual-input standalone Li-ion battery charger with integrated 600mA synchronous buck converter. It charges single-cell batteries from USB (up to 500mA) or wall adapter (up to 840mA), regulates float voltage at 4.2V ±0.6%, and delivers regulated 1.2V–1.8V output. Used in portable medical monitors requiring compact, thermally robust power management.
For engineers reviewing the LTC3550EDHC#PBF datasheet, LTC3550EDHC#PBF pinout, LTC3550EDHC#PBF application, or LTC3550EDHC#PBF equivalent, key selection criteria include dual-input source arbitration, thermal regulation at 105°C junction limit, programmable charge termination via ITERM, and 1.5MHz constant-frequency buck operation enabling small 2.2µH inductors.
Technical Context
The LTC3550EDHC#PBF integrates two independent power management blocks: a linear battery charger with automatic DCIN/USBIN source selection and a current-mode synchronous buck regulator powered from the battery. Its thermal regulation loop actively reduces charge current when die temperature reaches 105°C, preserving reliability without external thermal sensors.
Charge control uses CC/CV algorithm with trickle mode below 2.9V, constant-current up to 4.2V float, and automatic recharge at 4.1V (ΔV = 100mV). The buck regulator operates in Burst Mode® at light loads (20µA quiescent) and transitions to fixed 1.5MHz PWM above ~50mA, with internal P/N-channel MOSFETs eliminating external diodes or sense resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Input Sources | 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, enabling precise Li-ion cell voltage control |
| Buck Output Range | Adjustable 1.2V–1.8V via external VFB divider; 600mA continuous output with ±0.5% load regulation |
| Thermal Regulation Threshold | Junction temperature limit of 105°C; dynamically scales charge current to prevent overheating in sealed enclosures |
| Shutdown Current | 20µA on DCIN, 10µA on USBIN, and <2µA battery drain - critical for long-term standby in IoT edge nodes |
| Oscillator Frequency | 1.5MHz fixed (±200kHz) for buck regulator, enabling use of 2.2µH inductors and reducing EMI filtering burden |
| Charge Termination | Programmable via ITERM resistor (4–110mA range); terminates when IBAT falls below threshold after CV phase |
Pinout & Package
Package: 16-lead (5mm × 3mm) DFN with exposed thermal pad (Pin 17 = GND), 0.75mm profile, θJA = 40°C/W when pad soldered.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (16) | Wall adapter input supply | Accepts 4.3–8V; powers charger with up to 950mA; UVLO at 4.15V with 200mV hysteresis |
| USBIN (1) | USB port input supply | Accepts 4.3–8V; powers charger with up to 700mA; UVLO at 3.95V with 200mV hysteresis |
| IDC (14) / IUSB (2) | Charge current programming & monitoring | Servo to 1.0V in CC mode; IBAT = 1000 × VIDC/RIDC or VIUSB/RIUSB; enables real-time current measurement |
| ITERM (3) | Charge termination threshold setting | ITERMINATE = 100mV / RITERM; sets cutoff current from 4mA to 110mA for precise end-of-charge detection |
| ⎯P⎯W⎯R (4) / ⎯C⎯H⎯R⎯G (5) | Open-drain status outputs | ⎯P⎯W⎯R low = valid input power present; ⎯C⎯H⎯R⎯G low = active charging; both sink 10mA for LED drive |
| RUN (11) / EN (12) | Regulator and charger enable controls | RUN >1.5V enables buck; EN low enables charger; internal 2MΩ pull-downs ensure default-on behavior |
| BAT (15) | Charger output to battery | Delivers regulated 4.2V float; includes thermal foldback and automatic recharge at 4.1V |
| VFB (6) / SW (10) / VCC (7) | Buck feedback, switch node, and input | VFB sets output voltage; SW connects to 2.2µH inductor; VCC = 2.5–5.5V input for buck stage |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input automatic source selection | Selects DCIN over USBIN when VDCIN > VBAT + 180mV and > 4.15V, eliminating external power-path controllers |
| Integrated synchronous buck converter | 600mA output with internal P/N-MOSFETs; no external diode, sense resistor, or gate drivers required |
| Thermal regulation at 105°C | Reduces charge current in real time to maintain safe die temperature - avoids thermal shutdown in high-ambient environments |
| Programmable charge termination | External RITERM sets termination threshold from 4mA to 110mA, enabling optimization for battery capacity and safety margins |
| Burst Mode® operation | Reduces quiescent current to 20µA at light loads while maintaining regulation - extends battery runtime in sleep states |
| Recharge threshold with hysteresis | Auto-recharge triggers at VBAT = 4.1V (ΔV = 100mV below float), preventing premature cycling and extending cycle life |
Applications
| Portable Medical Monitors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered ECG monitor operating 8+ hours per charge in clinical environments with variable ambient temperatures. IC Role / Device Role / Timing Role: Dual-input charger manages USB recharging during clinic docking and wall-adapter top-up between shifts; buck powers 1.5V analog front-end and 1.8V microcontroller. Use Value: Thermal regulation prevents derating at 40°C ambient; 4.2V ±0.6% float ensures consistent battery capacity across production units. |
Use Scenario: Field-deployable multimeter with USB-C recharging and 24-hour battery life. IC Role / Device Role / Timing Role: Charger accepts power from USB host or AC adapter; buck supplies stable 1.2V reference and 1.8V logic rail with <0.5% load regulation. Use Value: 1.5MHz switching allows compact 2.2µH inductor; 10µA USBIN shutdown current minimizes parasitic drain during storage. |
| Wearable Health Trackers | Industrial Handheld Scanners |
Use Scenario: Compact wrist-worn pulse oximeter with Bluetooth LE and 7-day battery life. IC Role / Device Role / Timing Role: Charger handles intermittent USB recharging; buck powers 1.8V BLE SoC and 3.3V sensor interface via LDO post-regulation. Use Value: Burst Mode® reduces idle current to 20µA; automatic 4.1V recharge maintains >90% state-of-charge without user intervention. |
Use Scenario: Rugged barcode scanner used in warehouses with frequent AC/USB recharging cycles. IC Role / Device Role / Timing Role: Charger arbitrates between docked USB and wall-charging; buck delivers 1.5V to laser driver and 1.8V to imaging sensor. Use Value: 950mA DCIN charge rate enables full recharge in <2.5 hours; HPWR pin enables USB 2.0 vs USB 3.0 current scaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input Li-ion charger + DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555 | Single-input (USB only), no integrated buck, 500mA max charge, no thermal regulation | Limited to USB-powered devices; requires external regulator for system rails | Select when cost-sensitive, USB-only charging suffices, and thermal margin is ample |
| BQ24075 | USB-only input, no integrated buck, 1.5A charge, no programmable termination or thermal foldback | Higher charge current but lacks dual-input flexibility and system power integration | Choose for high-current USB charging where separate DC/DC is already implemented |
Compared with MAX1555 and BQ24075, the LTC3550EDHC#PBF uniquely combines dual-input source arbitration, integrated 600mA buck, and die-temperature-based thermal regulation - reducing BOM count by 3–5 components and enabling reliable operation in thermally constrained portable designs.
Availability
LTC3550EDHC#PBF is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, wearable health trackers, and industrial handheld scanners requiring stable component supply across extended product lifecycles.
Supply support for LTC3550EDHC#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 and maintains its precision analog and power management portfolio. Known for high-reliability, thermally optimized ICs targeting demanding industrial and medical applications.
The LTC3550EDHC#PBF belongs to Linear's Power Management family, designed specifically for space-constrained portable electronics needing integrated battery charging and system power conversion without compromising thermal performance or accuracy.
FAQ
What input voltage ranges does the LTC3550EDHC#PBF support for DCIN and USBIN?
The LTC3550EDHC#PBF supports DCIN from 4.3V to 8V (absolute max 10V) and USBIN from 4.3V to 8V (absolute max 10V). Both inputs feature undervoltage lockout: DCIN UVLO is 4.15V (200mV hysteresis), USBIN UVLO is 3.95V (200mV hysteresis). These thresholds ensure reliable startup while rejecting noisy or brownout conditions. The LTC3550EDHC#PBF automatically selects the valid source with highest priority - DCIN if both are present and meet criteria.
How is the charge current programmed on the LTC3550EDHC#PBF?
Charge current is independently programmed for DCIN and USBIN using external resistors: RIDC on Pin 14 sets wall-adapter current (IBAT = 1000 × VIDC/RIDC, VIDC = 1.0V), and RIUSB on Pin 2 sets USB current (IBAT = 1000 × VIUSB/RIUSB, VIUSB = 1.0V). Typical values are RIDC = 1.25kΩ (800mA) and RIUSB = 2.1kΩ (476mA). The LTC3550EDHC#PBF also supports HPWR pin scaling to 20% USB current for USB 2.0 compliance.
Does the LTC3550EDHC#PBF provide battery temperature monitoring?
No, the LTC3550EDHC#PBF does not include built-in battery temperature sensing or NTC interface. It relies solely on internal die temperature monitoring for thermal regulation - reducing charge current when junction temperature reaches 105°C. For battery temperature-dependent charge profiles (e.g., reduced current below 0°C), an external thermistor circuit and microcontroller supervision are required. The LTC3550EDHC#PBF itself implements only voltage- and time-based charge termination.
What is the purpose of the ITERM pin on the LTC3550EDHC#PBF?
The ITERM pin (Pin 3) programs the charge termination threshold current. Connecting RITERM to ground sets ITERMINATE = 100mV / RITERM, allowing selection from 4mA (R = 20kΩ) to 110mA (R = 1kΩ). When battery current drops below this threshold during constant-voltage phase, the LTC3550EDHC#PBF disables the charging FET and enters standby. This ensures full charge without overcharge, and the LTC3550EDHC#PBF's 6ms filter prevents false termination from transient current dips.
Can the LTC3550EDHC#PBF operate with a 3.3V input to the VCC pin?
Yes, the LTC3550EDHC#PBF supports VCC from 2.5V to 5.5V, making 3.3V fully compatible. The buck regulator's feedback reference is 0.6V ±0.5% (–40°C to 85°C), so with VCC = 3.3V, typical output voltages like 1.2V or 1.5V are achievable using standard resistor dividers. Efficiency remains high (>85% at 100mA) across this VCC range, and the internal switches' RDS(ON) is characterized down to 2.5V, ensuring stable operation even with partially discharged batteries powering VCC.
LTC3550EDHC#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
- 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#PBF FAQ
1.How can I place an order for LTC3550EDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3550EDHC#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#PBF reliable?
The price and inventory of LTC3550EDHC#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3550EDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3550EDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3550EDHC#PBF?
LTC3550EDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3550EDHC#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#PBF?
For technical support, including LTC3550EDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3550EDHC#PBF requirements.
6.How does Aetrix verify that LTC3550EDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3550EDHC#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3550EDHC#PBF?
All LTC3550EDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3550EDHC#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#PBF part is unused and in its original packaging.
Return procedure for LTC3550EDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3550EDHC#PBF Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
