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Analog Devices Inc. LTC3559EUD#TRPBF
- Part No.:
- LTC3559EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3559EUD#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,778
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Product details
Overview
LTC3559EUD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic linear USB battery charger with dual synchronous buck regulators for single-cell Li-Ion/Polymer systems. It delivers up to 950mA charge current (programmable via PROG pin), supports temperature-qualified charging via NTC input, and provides two independent 400mA, 2.25MHz buck outputs-enabling compact power management in portable audio devices and low-power handhelds.
For engineers reviewing the LTC3559EUD#TRPBF datasheet, LTC3559EUD#TRPBF pinout, LTC3559EUD#TRPBF application, or LTC3559EUD#TRPBF equivalent, key selection criteria include its integrated thermal regulation (105°C trip), dual-mode regulator control (Burst Mode®/pulse-skip), ±1% VFB accuracy, and compatibility with USB 2.0 power delivery constraints (HPWR-selectable 100/500mA modes).
Technical Context
The LTC3559EUD#TRPBF integrates a linear battery charger with constant-current/constant-voltage algorithm and two fully independent monolithic synchronous buck regulators. Its internal 2.25MHz oscillator enables small external inductors (4.7μH), while the MODE pin selects between high-efficiency Burst Mode® (35μA no-load quiescent) or low-noise pulse-skip operation.
Charge termination uses a 4-hour safety timer and C/10 detection; NTC monitoring disables charging outside 0°C–45°C (configurable via voltage thresholds); and thermal regulation reduces charge current above ~115°C junction temperature. The HPWR pin toggles full-scale (100%) or reduced (20%) charge current, aligning with USB suspend/resume requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Charge Current | Up to 950mA (HPWR = high); programmable via single resistor on PROG pin - enables precise USB-compliant current setting without DAC or digital interface. |
| Float Voltage Accuracy | ±0.5% over –40°C to 85°C (4.165V to 4.235V) - ensures safe, long-life Li-Ion charging without overvoltage stress. |
| Buck Output Current | 400mA per regulator (SW1/SW2) - sufficient to power core logic (1.2V) and I/O rails (2.5V) in MP3 players and wearables. |
| Switching Frequency | 2.25MHz (±15%) - allows use of 3.3mm × 3.3mm inductors and minimizes EMI in noise-sensitive audio applications. |
| Quiescent Current | 35μA in Burst Mode®, 8.5μA in suspend - extends battery runtime during standby in always-on portable devices. |
| NTC Thresholds | VCOLD = 76.5% VCC, VHOT = 34.9% VCC - supports standard 10kΩ NTC thermistors co-packaged with battery cells. |
| PROG Pin Scaling | IBAT = 800 × IPROG - enables real-time analog current monitoring with <1% error using simple resistor divider or ADC. |
Pinout & Package
Package: 16-lead (3mm × 3mm) QFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad for thermal performance (θJA = 68°C/W) and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power Ground Reference | Primary ground return for battery charger and buck regulators; must connect to PCB ground plane and exposed pad. |
| BAT (Pin 2) | Battery Charging Output | Delivers regulated charge current to single-cell Li-Ion; floats at 4.2V (LTC3559) with ±0.5% tolerance. |
| MODE (Pin 3) | Buck Regulator Operating Mode Control | High = Burst Mode® (ultra-low IQ); Low = pulse-skip (low-noise); must not be left floating. |
| FB1 (Pin 4) | Buck 1 Feedback Input | Senses output voltage via resistor divider; 800mV reference enables 1.2V, 2.5V, or custom rail generation. |
| EN1 (Pin 5) | Buck 1 Enable | Active-high logic input; controls startup/shutdown of first buck regulator independently of second. |
| SW1 (Pin 6) | Buck 1 Switch Node | Connects to external inductor; carries high-frequency switching current - requires tight layout to minimize EMI. |
| PVIN (Pin 7) | Buck Regulator Input Supply | Connected directly to BAT; supplies both buck stages - eliminates need for separate input rail. |
| SW2 (Pin 8) | Buck 2 Switch Node | Independent switching node for second buck regulator; supports asynchronous dual-rail power design. |
| EN2 (Pin 9) | Buck 2 Enable | Independent enable for second buck - enables dynamic rail sequencing or power gating. |
| FB2 (Pin 10) | Buck 2 Feedback Input | Second feedback path for independent output voltage regulation (e.g., 1.2V core + 2.5V I/O). |
| SUSP (Pin 11) | Charger Suspend Input | Voltage >1.2V disables charging and resets timer; internal weak pull-down ensures safe default state. |
| HPWR (Pin 12) | High-Power Charge Select | Voltage >1.2V enables full 950mA; <0.4V reduces to 190mA - implements USB 2.0 current negotiation in hardware. |
| NTC (Pin 13) | Thermistor Monitoring Input | Analog input for NTC bias network; detects cold/hot faults and pauses charging outside safe temperature window. |
| PROG (Pin 14) | Charge Current Program/Monitor | Resistor-to-ground sets charge current; voltage (1.0V or 0.2V) indicates mode; current = 800×IPROG. |
| CHRG (Pin 15) | Open-Drain Charge Status | Indicates charging (low), terminated (high-Z), NTC fault (35kHz @ 1.5Hz blink), or bad battery (35kHz @ 6.1Hz blink). |
| VCC (Pin 16) | Charger Input Supply | Accepts 4.3V–5.5V USB or AC adapter input; includes UVLO (4.0V threshold) and differential lockout (50mV ΔV). |
| Exposed Pad (Pin 17) | Thermal & Electrical Ground | Mandatory solder connection to PCB ground plane - critical for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent Buck Regulators | Each delivers 400mA at 2.25MHz with separate EN/FB pins - enables flexible rail sequencing and independent power domain control. |
| USB-Compliant Charge Current Selection | HPWR pin toggles between 100% (950mA) and 20% (190mA) of programmed current - satisfies USB 2.0 suspend/resume current limits without firmware. |
| Integrated Thermal Regulation | Reduces charge current above ~115°C junction temperature - prevents thermal runaway during high-ambient or high-load conditions without external sensors. |
| Intelligent CHRG Status Encoding | Four-state open-drain output (low / high-Z / [email protected] / [email protected]) - supports both LED indication and microprocessor fault decoding in one pin. |
| NTC-Based Temperature Qualification | Configurable cold/hot thresholds (76.5%/34.9% VCC) with hysteresis - ensures safe charging across battery pack temperature range without MCU intervention. |
| Low-Noise Pulse-Skip Mode | Enables <10mVPP output ripple at full load - suitable for noise-sensitive analog circuits like audio codecs and RF front-ends. |
Applications
| Portable Audio Players | Wearable Health Monitors |
|---|---|
Use Scenario: SD/Flash-based MP3 player with Li-Ion battery, stereo DAC, and display backlight. IC Role / Device Role / Timing Role: LTC3559EUD#TRPBF serves as primary power manager - charging battery from USB while simultaneously powering 1.2V SoC core and 2.5V audio codec rails. Use Value: Dual buck regulators eliminate discrete LDOs; Burst Mode® extends playback time by 30% vs fixed-frequency operation at light loads. | Use Scenario: Wrist-worn pulse oximeter with optical sensor, BLE radio, and rechargeable coin cell. IC Role / Device Role / Timing Role: LTC3559EUD#TRPBF manages battery charging and powers 1.8V sensor interface and 3.3V BLE transceiver from single Li-Ion cell. Use Value: NTC input ensures safe charging during skin-contact use; 35μA quiescent current enables >7-day standby on 120mAh battery. |
| Industrial Handheld Scanners | Smart Remote Controls |
Use Scenario: Rugged barcode scanner with laser diode driver, imager, and Bluetooth connectivity. IC Role / Device Role / Timing Role: LTC3559EUD#TRPBF supplies regulated 3.3V for MCU and 5V for laser driver (via external boost) while charging from USB host port. Use Value: HPWR pin enables automatic 500mA fast-charge when connected to powered USB hub - cuts recharge time by 60% vs 100mA mode. | Use Scenario: Voice-controlled universal remote with IR/RF transceivers and motion wake-up sensor. IC Role / Device Role / Timing Role: LTC3559EUD#TRPBF powers ultra-low-power MCU (1.2V) and RF SoC (2.5V) while maintaining battery health via thermal-regulated charging. Use Value: Internal 4-hour safety timer prevents overcharge during infrequent use; CHRG pin blinks to indicate NTC fault during storage in hot vehicles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger + dual-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555ETE+ | Single-output linear charger only (no buck regulators); 500mA max charge; no NTC input or thermal regulation. | Requires external DC/DC converters for multi-rail systems; limited to basic USB charging without system power management. | Select when only battery charging is needed and cost is primary constraint; not suitable for integrated power solutions. |
| BQ24075RGER | Linear charger + single LDO (not buck); 1A charge; includes I2C interface but no integrated switching regulators. | Cannot replace dual-buck functionality; requires external buck converters for multi-rail designs - increases BOM count and board area. | Choose for I2C-configurable charging with basic system power; avoid when dual independent regulated rails are required. |
Compared with MAX1555ETE+ and BQ24075RGER, the LTC3559EUD#TRPBF uniquely integrates dual 400mA synchronous bucks with USB-compliant charging and NTC safety - eliminating four external ICs and reducing solution size by >40% in portable applications requiring ≥2 regulated rails.
Availability
LTC3559EUD#TRPBF is available at Aetrix Electronics and suitable for portable audio players, wearable health monitors, industrial handheld scanners, and smart remote controls requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3559EUD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3559EUD#TRPBF belongs to Linear's Power Management product line, designed specifically for space-constrained portable electronics requiring integrated battery charging and multi-rail DC/DC conversion without compromising efficiency or safety.
FAQ
What is the maximum battery charge current supported by the LTC3559EUD#TRPBF?
The LTC3559EUD#TRPBF supports up to 950mA charge current when the HPWR pin is high and the PROG resistor is set accordingly (e.g., 1.74kΩ yields 460mA typical). With HPWR low, current drops to 20% of the programmed value - enabling USB 2.0-compliant 100mA/500mA modes. Thermal regulation reduces current above ~115°C to prevent damage.
How does the LTC3559EUD#TRPBF handle battery temperature monitoring?
The LTC3559EUD#TRPBF uses the NTC pin to monitor battery temperature via an external thermistor network. It compares NTC voltage against factory-trimmed thresholds (VCOLD = 76.5% VCC, VHOT = 34.9% VCC) and pauses charging if temperature is out of range. Hysteresis prevents chatter, and the function can be disabled by grounding the NTC pin.
Can the two buck regulators in the LTC3559EUD#TRPBF operate at different output voltages?
Yes - the LTC3559EUD#TRPBF supports independent output voltages via separate FB1/FB2 feedback dividers. Each buck regulator uses an internal 800mV reference, so common configurations include 1.2V (FB1 divider = 1.5kΩ/1.0kΩ) and 2.5V (FB2 divider = 3.09kΩ/1.0kΩ). EN1 and EN2 allow individual enable/disable control.
What is the purpose of the CHRG pin on the LTC3559EUD#TRPBF, and how is it decoded?
The CHRG pin on the LTC3559EUD#TRPBF is an open-drain status indicator with four distinct states: low (charging), high-impedance (terminated), 35kHz @ 1.5Hz blink (NTC fault), and 35kHz @ 6.1Hz blink (bad battery). A pull-up resistor or LED driver enables human-readable indication, while a microcontroller can decode duty cycle or blink frequency for automated fault response.
Does the LTC3559EUD#TRPBF require external compensation components for its buck regulators?
No - the LTC3559EUD#TRPBF features internally compensated synchronous buck regulators. No external compensation capacitors or resistors are needed for stable operation across the full load and input voltage range. This simplifies layout, reduces BOM count, and improves reliability compared to externally compensated DC/DC controllers.
LTC3559EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 950mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3559EUD#TRPBF FAQ
1.How can I place an order for LTC3559EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3559EUD#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 LTC3559EUD#TRPBF reliable?
The price and inventory of LTC3559EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3559EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3559EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3559EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3559EUD#TRPBF?
LTC3559EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3559EUD#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 LTC3559EUD#TRPBF?
For technical support, including LTC3559EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3559EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3559EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3559EUD#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 LTC3559EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3559EUD#TRPBF?
All LTC3559EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3559EUD#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 LTC3559EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3559EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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