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Analog Devices Inc. LTC3553EUD#PBF
- Part No.:
- LTC3553EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3553EUD#PBF.pdf
- Description:
- IC USB POWER MANAGER 20UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,223
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Product details
Overview
LTC3553EUD#PBF from Analog Devices (formerly Linear Technology) is a micropower USB power manager IC integrating Li-ion battery charger, 200mA synchronous buck regulator, 150mA LDO, PowerPath™ ideal diode, and pushbutton controller in a single 20-pin QFN. It delivers seamless source prioritization between USB input (100/500mA selectable) and single-cell Li-ion battery, with 12μA standby quiescent current and thermal-protected charging up to 420mA.
For engineers reviewing the LTC3553EUD#PBF datasheet, LTC3553EUD#PBF pinout, LTC3553EUD#PBF application, or LTC3553EUD#PBF equivalent, key selection criteria include its dual-regulator enable sequencing via SEQ pin, STBY-mode current reduction, VBUS undervoltage lockout (3.5V), and integrated NTC-based temperature fault monitoring for safe battery charging.
Technical Context
The LTC3553EUD#PBF implements a hierarchical power management architecture: PowerPath™ automatically routes VBUS or BAT to VOUT while limiting total input current to 100mA or 500mA via HPWR/SUSP logic; battery charge current is dynamically throttled to prevent exceeding that limit. Its buck regulator operates at 1.125MHz with 780–820mV feedback threshold and supports Burst Mode® for ultra-low-noise light-load operation.
Charging follows CC/CV profile with programmable ICHG (via PROG pin), VFLOAT = 4.165–4.235V, and safety timer (4h typical); thermal regulation reduces charge current above 110°C junction temperature. The LDO provides 150mA output with 160mV dropout at 150mA and 3.8V input, while PBSTAT and ON pins implement a state-machine-driven pushbutton interface supporting hard reset, power-up, and power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (VBUS) | 4.35V to 5.5V - matches standard USB 2.0 host port compliance and enables direct connection without external level-shifting. |
| Battery Charge Current | 400mA typical (RPROG = 1.87kΩ) - programmable via single resistor; supports fast charging of 200–1000mAh Li-ion cells. |
| Buck Regulator Output | 200mA at 1.2V/1.8V/2.5V/3.3V (configurable via feedback resistors) - enables powering low-voltage digital subsystems directly. |
| LDO Output Current | 150mA continuous - sufficient for analog sensors, RF modules, or MCU cores requiring low-noise, stable bias. |
| Standby Quiescent Current | 12μA with all regulators enabled - extends battery life in always-on wearable or medical devices during sleep states. |
| Package | 20-pin 3mm × 3mm × 0.75mm QFN - compact footprint with exposed pad for thermal dissipation; compatible with automated PCB assembly. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable consumer environments without derating. |
Pinout & Package
Package: 20-pin plastic QFN (3mm × 3mm × 0.75mm), exposed pad (Pin 21) connected to GND and required to be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HPWR (1) | Input current limit select | Drives high for 500mA USB mode; low for 100mA mode - enables dynamic adaptation to host capability. |
| SEQ (2) | Power-up sequence control | Low = buck first; high = LDO first - ensures correct voltage sequencing for mixed-supply SoCs or FPGAs. |
| PBSTAT (3) | Debounced pushbutton status | Open-drain output synchronized to ON pin - provides clean interrupt signal to microcontroller without software debouncing. |
| ON (4) | Pushbutton input | Internal weak pull-up; grounded via momentary switch - initiates power-on, hard reset, or power-down based on timing per datasheet state machine. |
| LDO_ON (5) | LDO enable control | Logic-level input; must be driven - allows independent software/hardware control of analog rail activation. |
| STBY (6) | Standby mode control | High = ultra-low IQ (12μA), reduced load capability (10mA buck), slower transient response - optimizes battery runtime in idle states. |
| BUCK_ON (7) | Buck regulator enable | Logic-level input; must be driven - decouples digital core supply control from LDO/analog rails. |
| BUCK_FB (8) | Buck feedback input | Servos to 0.8V reference - sets output voltage via external resistor divider; enables precision regulation across load/temperature. |
| LDO_FB (9) | LDO feedback input | Servos to 0.8V reference - permits adjustable LDO output using external resistor network; supports custom voltage requirements. |
| LDO (10) | LDO output | 150mA regulated output - requires local 10µF ceramic capacitor for stability and noise suppression. |
| VINLDO (11) | LDO input | Accepts 1.65–5.5V - can be powered from VOUT (battery/USB), buck output, or separate supply for flexible system architecture. |
| BVIN (12) | Buck input | 2.7–5.5V input - typically tied to VOUT; internal 1.1Ω PMOS/0.7Ω NMOS switches enable high-efficiency conversion. |
| SW (13) | Buck switch node | Connects to external 10µH inductor - switching waveform drives energy transfer; requires careful layout to minimize EMI. |
| CHRG (14) | Charge status indicator | Open-drain output pulled low during active charging; high-Z when C/10 termination reached - drives LED or GPIO with external pull-up. |
| NTC (15) | Battery temperature monitor | Interfaces to thermistor divider - halts charging if battery exceeds 34–36% VBUS (hot) or falls below 75–77% VBUS (cold). |
| PROG (16) | Charge current programming | 1V servo voltage in CC mode; ICHG = 750mA·V / RPROG - enables accurate, resistor-set charge rate with real-time current monitoring. |
| BAT (17) | Li-ion battery terminal | Direct connection to single-cell anode - integrates ideal diode (240mΩ) for automatic source selection and reverse-current blocking. |
| VOUT (18) | PowerPath output | Main system supply rail - sourced from VBUS (via ideal diode) or BAT; powers external loads and internal regulators; requires 10µF ceramic bypass. |
| SUSP (19) | Suspend mode enable | High = disable VBUS current limit; system draws only from battery - essential for zero-VBUS leakage in USB-hosted applications. |
| VBUS (20) | USB input supply | 4.35–5.5V input - includes 3.5V UVLO and differential lockout to prevent false turn-on during brownout conditions. |
| GND (21) | Ground reference | Exposed thermal pad - mandatory solder connection to PCB ground plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| 12μA standby quiescent current with all regulators active | Enables multi-week battery life in always-on wearables and remote sensors without compromising system readiness. |
| Automatic load prioritization between USB and battery | Ensures uninterrupted system operation during USB disconnect or brownout by seamlessly switching to battery via 240mΩ ideal diode. |
| Programmable Li-ion charge current with thermal foldback | Supports safe, adaptive charging across ambient temperatures; prevents overheating during high-current charge cycles. |
| Configurable power-up sequencing (SEQ pin) | Eliminates need for external sequencers in multi-rail systems; guarantees correct voltage ramp order for sensitive processors or FPGAs. |
| Integrated pushbutton state machine with hard reset | Reduces BOM count by replacing discrete reset ICs and power controllers; supports long-press power-off and short-press wake-up. |
Applications
| USB-Based Handheld Products | Portable Li-Ion/Polymer Based Electronic Devices |
|---|---|
Use Scenario: Compact USB-rechargeable handheld meter with MCU, display, and sensor interface. IC Role / Device Role / Timing Role: Central power manager coordinating USB charging, battery backup, and dual-rail (1.2V digital / 3.3V analog) regulation. Use Value: Eliminates discrete charger + dual LDOs + power switch; 12μA standby extends 500mAh battery to >30 days in sleep mode. | Use Scenario: Portable ultrasound probe powered by internal Li-ion and recharged via USB-C host. IC Role / Device Role / Timing Role: Primary power controller managing battery charge, high-efficiency buck for FPGA, and low-noise LDO for ADC reference. Use Value: SEQ pin ensures FPGA powers before ADC, preventing initialization faults; thermal monitoring prevents battery damage during field use. |
| Wearable Electronics | Low Power Medical Devices |
Use Scenario: Smartwatch with heart-rate sensor, BLE radio, and OLED display operating from 300mAh cell. IC Role / Device Role / Timing Role: System power hub enabling USB fast-charge, ultra-low-power standby, and sequenced wake-up of sensor subsystems. Use Value: STBY mode cuts system IQ to 12μA; CHRG pin drives status LED without MCU involvement, saving firmware overhead. | Use Scenario: Pocket-sized glucose monitor requiring FDA-grade reliability, battery safety, and USB data sync. IC Role / Device Role / Timing Role: Safety-critical power manager enforcing NTC-based temperature limits, C/10 charge termination, and hard-reset recovery. Use Value: Integrated thermal fault detection and 4-hour safety timer meet IEC 62304 software safety requirements without external supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555ETA+ | Single-input (USB-only) Li-ion charger with no buck/LDO; 100mA fixed input limit; no NTC support. | Lacks dual-regulator integration and battery-powered operation - suitable only for USB-only, non-portable devices. | Select MAX1555ETA+ only when system has no battery backup requirement and uses fixed 100mA USB sourcing. |
| BQ24075RGTR | USB-powered Li-ion charger with integrated LDO (200mA), but no buck regulator; no PowerPath or ideal diode. | Cannot power system from battery while charging; lacks seamless source transition and dual-rail flexibility. | Choose BQ24075RGTR for cost-sensitive, single-rail (3.3V only) USB-charged devices without battery runtime needs. |
Compared with MAX1555ETA+ and BQ24075RGTR, the LTC3553EUD#PBF uniquely combines USB/battery source arbitration, dual-output regulation, and thermal-safe charging in one package - making it optimal for portable, battery-backed systems requiring extended runtime and robust safety.
Availability
LTC3553EUD#PBF is available at Aetrix Electronics and suitable for USB-rechargeable handheld products, portable medical monitors, wearable electronics, and low-power industrial sensors requiring stable component supply and long-term lifecycle support.
Supply support for LTC3553EUD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, acquired Linear Technology in 2017 to strengthen its power management portfolio.
The LTC3553EUD#PBF belongs to ADI's PowerPath™ family of integrated power managers, designed specifically for space-constrained, battery-backed USB devices requiring intelligent source selection, efficient regulation, and comprehensive battery safety.
FAQ
What is the maximum continuous battery charge current supported by the LTC3553EUD#PBF?
The LTC3553EUD#PBF supports a maximum constant-current charge current of 420mA (typical 400mA) when configured with a 1.87kΩ resistor on the PROG pin. This value is guaranteed over the full –40°C to +85°C operating temperature range and includes thermal foldback protection that reduces current above 110°C junction temperature to prevent damage. The LTC3553EUD#PBF also enforces a 4-hour safety timer and C/10 termination to ensure reliable, standards-compliant Li-ion charging.
How does the LTC3553EUD#PBF handle power source transitions between USB and battery?
The LTC3553EUD#PBF uses its internal PowerPath™ architecture with a 240mΩ ideal diode to provide seamless, glitch-free transitions between VBUS and BAT sources. When VBUS is present, priority is given to the system load on VOUT; excess current charges the battery. If VBUS is removed or drops below UVLO (3.5V), the ideal diode automatically conducts from BAT to VOUT without interruption. The LTC3553EUD#PBF maintains regulation throughout the switchover, ensuring zero downtime for connected loads.
Can the LTC3553EUD#PBF operate with a discharged battery (e.g., <2.5V)?
Yes, the LTC3553EUD#PBF supports instant-on operation with a deeply discharged battery. When VBAT falls below the trickle-charge threshold (2.6–2.75V), the device enters trickle mode and delivers up to 50mA to safely raise the cell voltage. Once VBAT exceeds 2.75V, it transitions to constant-current charging. This behavior, combined with the 12μA standby current, allows the LTC3553EUD#PBF to power the system immediately upon USB connection-even with a fully depleted battery-without requiring external wake-up circuitry.
What are the voltage options for the buck regulator output of the LTC3553EUD#PBF?
The buck regulator output voltage of the LTC3553EUD#PBF is externally programmable via the BUCK_FB pin and a resistor divider, with common configurations including 1.2V, 1.8V, 2.5V, and 3.3V. The internal feedback reference is tightly regulated at 780–820mV over temperature, enabling precise output setting. The regulator delivers up to 200mA continuously and supports Burst Mode® operation for high efficiency at light loads, making it suitable for powering digital cores, memory, or communication ICs in portable systems.
Does the LTC3553EUD#PBF require external components for NTC-based temperature monitoring?
Yes, the LTC3553EUD#PBF requires two external components for NTC functionality: a precision bias resistor (typically 100kΩ) from VBUS to NTC pin, and an NTC thermistor from NTC pin to ground. The device measures the resulting voltage divider ratio to detect battery temperature faults - cold fault triggers at 75–77% VBUS, hot fault at 34–36% VBUS, with built-in hysteresis. If temperature monitoring is not needed, the NTC pin must be grounded per datasheet guidance; leaving it floating is not permitted.
LTC3553EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Handheld/Mobile Devices
- Current - Supply:
- 12µA
- Voltage - Supply:
- 4.3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
LTC3553EUD#PBF FAQ
1.How can I place an order for LTC3553EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3553EUD#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 LTC3553EUD#PBF reliable?
The price and inventory of LTC3553EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3553EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3553EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3553EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3553EUD#PBF?
LTC3553EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3553EUD#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 LTC3553EUD#PBF?
For technical support, including LTC3553EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3553EUD#PBF requirements.
6.How does Aetrix verify that LTC3553EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3553EUD#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 LTC3553EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3553EUD#PBF?
All LTC3553EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3553EUD#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 LTC3553EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3553EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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