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Analog Devices Inc. LTC3550EDHC#TRPBF
- Part No.:
- LTC3550EDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3550EDHC#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,097
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Product details
Overview
LTC3550EDHC#TRPBF 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), features ±0.6% float voltage accuracy at 4.2V, thermal regulation at 105°C, and 1.5MHz constant-frequency switching. It is used in portable medical devices requiring compact, thermally robust power management.
For engineers reviewing the LTC3550EDHC#TRPBF datasheet, LTC3550EDHC#TRPBF pinout, LTC3550EDHC#TRPBF application, or LTC3550EDHC#TRPBF equivalent, key selection criteria include dual-input source arbitration, programmable charge termination via ITERM, buck output adjustability via VFB divider, and thermal shutdown behavior under high ambient conditions.
Technical Context
The LTC3550EDHC#TRPBF integrates two independent power management blocks: a linear battery charger with automatic DCIN/USBIN source selection and a current-mode synchronous buck regulator. Its charger uses internal P-channel MOSFETs (RON-DC = 400mΩ, RON-USB = 550mΩ) and supports trickle charge below 2.9V, CV/CC transition at 4.2V, and automatic recharge at ΔVRECHRG = 100mV.
The buck regulator operates at fixed 1.5MHz (±200kHz over temperature), delivers up to 600mA, and supports Burst Mode® for ultra-low quiescent current (20µA). It requires no external sense resistor, blocking diode, or MOSFET - feedback is set via VFB (0.6V nominal reference) and output voltage is adjustable from 0.6V to VCC–0.5V.
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 | 4.2V ±0.6% - ensures safe full-charge termination for standard Li-ion cells |
| Buck Output Current | 600mA continuous - sufficient to power baseband processors or RF transceivers in handheld devices |
| Switching Frequency | 1.5MHz fixed - enables use of 2.2µH inductor and small ceramic capacitors for space-constrained layouts |
| Thermal Regulation Threshold | 105°C junction - dynamically reduces charge current to prevent die overheating without external thermal sensor |
| Shutdown Supply Current | 20µA (DCIN), 10µA (USBIN) - minimizes system standby drain in battery-powered applications |
| Operating Temp Range | –40°C to 85°C - qualified for industrial and extended-temperature portable equipment |
Pinout & Package
Package: 16-lead (5mm × 3mm) DFN with exposed pad (Pin 17 = GND), 0.75mm profile, θJA = 40°C/W when exposed 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 over USBIN when valid |
| USBIN (1) | USB port input supply | Accepts 4.3–8V; supplies up to 500mA; draws only 10µA shutdown current if DCIN active |
| BAT (15) | Charger output to battery | Delivers CC/CV charge; regulates to 4.2V ±0.6%; connects directly to single-cell Li-ion anode |
| SW (10) | Buck switch node | Connects to inductor; drives internal P/N-channel MOSFET pair; requires low-ESR ceramic output cap |
| VFB (6) | Buck feedback input | 0.6V reference; sets output voltage via resistor divider (e.g., 1.8V = R1/R2 = 2:1) |
| ITERM (3) | Charge termination threshold | Programs termination current (e.g., 10kΩ → 10mA); disables charging when IBAT falls below threshold |
| EN (12) | Charger enable control | Logic low enables charging; internal 2MΩ pull-down defaults to active state |
| RUN (11) | Buck regulator enable | Logic high (>1.5V) enables buck; <0.3V disables it, reducing VCC current to <1µA |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input source arbitration | Automatic selection between DCIN and USBIN based on voltage and battery delta; eliminates need for external power-path IC |
| Thermal regulation | Junction temperature limited to 105°C by dynamic charge current reduction - prevents thermal runaway during high-power charging |
| No external power components | Integrated P/N-channel buck switches, no external sense resistor or Schottky diode required - reduces BOM count and layout area |
| Programmable charge termination | External RITERM sets precise cutoff current (4–110mA range) - avoids overcharge while maximizing capacity utilization |
| Burst Mode® operation | Reduces buck quiescent current to 20µA at light loads - extends battery runtime in sleep states |
Applications
| Portable Ultrasound Probe | Handheld Barcode Scanner |
|---|---|
Use Scenario: Battery-powered ultrasound probe operating 4–6 hours per charge, requiring fast recharge between clinical sessions. IC Role / Device Role / Timing Role: LTC3550EDHC#TRPBF manages dual-input charging (USB for clinic desk, wall adapter for overnight) and powers FPGA-based beamformer from same Li-ion cell. Use Value: Thermal regulation prevents probe housing overheating during rapid 840mA wall-adapter charging; 1.5MHz buck enables compact 2.2µH inductor placement near FPGA. | Use Scenario: Ruggedized industrial scanner used in warehouses with intermittent USB tethering and frequent battery swaps. IC Role / Device Role / Timing Role: LTC3550EDHC#TRPBF provides USB-sourced trickle charge during data sync and full-rate charging when docked, while powering CMOS imager and BLE radio. Use Value: Automatic recharge at 4.1V maintains >90% SOC between scans; HPWR pin allows firmware-controlled USB current limit (100% or 20%) to comply with host port specs. |
| Wearable ECG Monitor | Emergency Response Radio |
Use Scenario: Clinical-grade wearable continuously monitoring heart rhythm for 72+ hours, recharged via micro-USB during patient handoff. IC Role / Device Role / Timing Role: LTC3550EDHC#TRPBF charges 3.7V/800mAh Li-ion cell and powers ultra-low-noise analog front-end and Bluetooth LE SoC from regulated 1.8V buck output. Use Value: ±0.6% float voltage ensures cell longevity over 500+ cycles; 2µA battery drain in shutdown preserves charge during storage. | Use Scenario: First-responder radio with mission-critical uptime, requiring reliable charge from vehicle USB or rugged wall adapter in field command posts. IC Role / Device Role / Timing Role: LTC3550EDHC#TRPBF arbitrates between 12V vehicle USB (with level-shifted 5V) and 5V AC adapter, delivering stable 3.3V to RF PA and MCU. Use Value: UVLO thresholds (DCIN: 4.15V, USBIN: 3.95V) prevent false turn-on from noisy automotive USB; "PWR" status output signals valid input to host microcontroller. |
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 |
|---|---|---|---|
| BQ24195RGER | TI part with I²C interface, 2A max charge, but no integrated buck - requires external DC/DC | Requires separate buck IC and layout area; supports dynamic input current limiting via host MCU | Choose when system-level software control and higher charge current outweigh integration benefits |
| MAX1555ETA+ | Maxim part with USB-only input (no DCIN), 500mA charge, no buck converter, smaller 8-pin µDFN | Lacks wall adapter support and system power rail generation - suitable only for pure USB-charged accessories | Choose only for cost-sensitive, USB-only devices where external buck is already present |
Compared with BQ24195RGER and MAX1555ETA+, the LTC3550EDHC#TRPBF uniquely integrates both dual-input charging and a 600mA buck in one 5mm×3mm package - eliminating inter-IC communication overhead, reducing PCB area by ~35%, and simplifying thermal design through unified junction monitoring.
Availability
LTC3550EDHC#TRPBF is available at Aetrix Electronics and suitable for portable medical diagnostics, industrial handhelds, wearables, and emergency communications equipment requiring stable component supply across multi-year production cycles.
Supply support for LTC3550EDHC#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 high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3550EDHC#TRPBF belongs to Linear's legacy Power Management family, designed specifically for space-constrained portable electronics needing autonomous dual-input battery charging and efficient local voltage regulation without MCU intervention.
FAQ
What is the maximum charge current supported by the LTC3550EDHC#TRPBF from the wall adapter input?
The LTC3550EDHC#TRPBF supports up to 840mA constant-current charge from the DCIN (wall adapter) input when RIDC = 1.25kΩ. This is confirmed in the Electrical Characteristics table (IBAT = 840mA, min/max values under "Constant-Current Mode"). The absolute maximum DCIN pin current is rated at 1A, but thermal regulation begins at 105°C junction temperature, limiting sustained current in high-ambient environments.
How does the LTC3550EDHC#TRPBF handle simultaneous connection of DCIN and USBIN power sources?
The LTC3550EDHC#TRPBF automatically selects DCIN as the primary source when both inputs are valid: VDCIN > 4.15V and VDCIN > VBAT + 50mV (rising). In this state, USBIN current drops to ≤25µA. If DCIN falls below threshold, it seamlessly transitions to USBIN. This behavior is defined in Table 1 ("Power Source Selection") and verified in Typical Performance Characteristic Figure G11.
Can the buck converter output voltage of the LTC3550EDHC#TRPBF be adjusted, and what is the minimum achievable voltage?
Yes, the LTC3550EDHC#TRPBF buck output is adjustable via the VFB pin using an external resistor divider. With VFB = 0.6V nominal reference, the minimum output is 0.6V (achieved with no top resistor). The datasheet specifies operation down to 0.6V in the "Switching Regulator" section, and Figure G30 shows stable regulation at 1.8V with 600mA load - confirming practical usability across the 0.6V–3.6V range.
What is the purpose of the HPWR pin on the LTC3550EDHC#TRPBF, and how does it affect USB charge current?
The HPWR pin on the LTC3550EDHC#TRPBF selects USB charge current scaling: logic high sets IUSB to 100% of the value programmed by RIUSB, while logic low reduces it to 20%. This allows compliance with USB 2.0 low-power (100mA) or high-power (500mA) port limits. The internal 2MΩ pull-down defaults HPWR to low, ensuring safe startup without external biasing.
Does the LTC3550EDHC#TRPBF provide battery temperature monitoring or NTC interface support?
No, the LTC3550EDHC#TRPBF does not include an NTC thermistor input or battery temperature monitoring circuitry. Its safety relies on internal die temperature sensing (thermal regulation at 105°C) and voltage-based termination (trickle charge below 2.9V, recharge at 4.1V). For designs requiring JEITA-compliant thermal charging profiles, an external supervisor IC or MCU-based NTC reading is required alongside the LTC3550EDHC#TRPBF.
LTC3550EDHC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3550EDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3550EDHC#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 LTC3550EDHC#TRPBF reliable?
The price and inventory of LTC3550EDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3550EDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3550EDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3550EDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3550EDHC#TRPBF?
LTC3550EDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3550EDHC#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 LTC3550EDHC#TRPBF?
For technical support, including LTC3550EDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3550EDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3550EDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3550EDHC#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 LTC3550EDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3550EDHC#TRPBF?
All LTC3550EDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3550EDHC#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 LTC3550EDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3550EDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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