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Analog Devices Inc. LTC4088EDE#PBF
- Part No.:
- LTC4088EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC4088EDE#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,349
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Product details
Overview
LTC4088EDE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency USB PowerPath™ controller and Li-ion/polymer battery charger IC with integrated synchronous step-down switching regulator, ideal diode, and dual LDOs. It delivers up to 1.2A input current limit (10x mode), 1.5A charge current with thermal limiting, and Bat-Track™ adaptive VOUT control - enabling simultaneous system power delivery and battery charging from USB or wall adapter in space-constrained portable devices.
For engineers reviewing the LTC4088EDE#PBF datasheet, LTC4088EDE#PBF pinout, LTC4088EDE#PBF application, or LTC4088EDE#PBF equivalent, key selection considerations include its 14-lead DFN package, 2.25MHz switching frequency, 180mΩ internal ideal diode, programmable USB current limits (100mA/500mA/1A), and integrated NTC thermistor monitoring for safe battery charging.
Technical Context
The LTC4088EDE#PBF implements a precision average-input-current-limited 2.25MHz synchronous buck regulator that dynamically partitions power between VOUT load and battery charging while maintaining strict USB compliance. Its Bat-Track™ control sets VOUT ≈ BAT + 0.3V (or fixed 3.6V if BAT < 3.3V) to minimize charger losses.
It integrates three independent power paths: (1) switching regulator from VBUS to VOUT, (2) internal 180mΩ ideal diode + external PMOS gate driver (GATE pin) from BAT to VOUT, and (3) suspend-mode LDO (4.6V) and always-on 3.3V LDO (25mA). Charge termination uses C/X and PROG pins with 1031× current-sense ratio and 4.2V float voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VBUS = 4.35V to 5.5V (7V transient max); enables direct USB 5V and wall adapter compatibility |
| Max Input Current Limit | 1.2A (10x mode); programmable via D0/D1/D2 logic and CLPROG resistor for USB 1.0/2.0/BC1.2 compliance |
| Battery Charge Current | Up to 1.5A with thermal regulation; set by PROG resistor (e.g., 1kΩ → 1.03A typ) |
| VOUT Regulation | Bat-Track™ mode: VOUT = BAT + 0.3V (minimizes charger conduction loss); fixed 3.6V when BAT < 3.3V for instant-on operation |
| Ideal Diode Forward Drop | 15mV at light load; 180mΩ on-resistance at full conduction; ensures seamless switchover from VBUS to battery |
| Switching Frequency | 2.25MHz (typ); enables compact 3.3µH inductor and low-profile MLCC output filtering |
| Package | 14-lead 4mm × 3mm × 0.75mm DFN; exposed pad for thermal dissipation (θJA = 37°C/W) |
Pinout & Package
Package: 14-lead plastic DFN (4mm × 3mm × 0.75mm), exposed pad (Pin 15) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBUS (11) | USB/wall adapter input | Primary power source; monitored for UVLO (4.3V rise/4.0V fall) and current limiting |
| VOUT (10) | System power output | Regulated output supplying both load and battery charger; tracks BAT + 0.3V or fixed 3.6V |
| BAT (9) | Battery connection | Single-cell Li-ion/polymer anode; feeds ideal diode and charger; monitored for recharge (–100mV hysteresis) |
| SW (12) | Switch node | Connects to 3.3µH inductor; carries pulsed current for buck conversion; requires low-ESR ceramic bypass |
| GATE (8) | External PMOS driver | Drives gate of optional external P-channel MOSFET to augment internal ideal diode conduction |
| PROG (6) | Charge current programming | Servos to 1.000V in CC mode; IBAT = (VPROG/RPROG) × 1031 enables precise current setting |
| C/X (5) | End-of-charge threshold | Programs CHRG assertion level (e.g., RC/X = 1kΩ → 85mA termination current) |
| CLPROG (2) | Input current limit programming | 1.188V servo point; sets IBUS(LIM) via RCLPROG and hCLPROG ratios (224–2140 mA/mA) |
| NTC (1) | Battery temperature monitor | Accepts NTC thermistor divider; triggers charge pause if VCOLD > 78% VBUS or VHOT < 33.4% VBUS |
| LDO3V3 (3) | Always-on 3.3V supply | Regulated 3.3V output (3.1–3.4V) powered from VOUT; supports RTC or standby MCU without VBUS |
| CHRG (7) | Charge status indicator | Open-drain output modulated at 35kHz; signals charging, float, bad battery, or thermal fault |
| D0/D1/D2 (13/14/4) | Mode select inputs | Three-pin logic selects IBUS(LIM) (100mA/500mA/1A/suspend) and charger enable state |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ architecture | Simultaneous VOUT load powering and battery charging with priority to system load - no manual power-path arbitration required |
| Bat-Track™ adaptive output | VOUT dynamically tracks BAT + 0.3V to reduce charger FET conduction loss and improve efficiency above 85% |
| Integrated ideal diode | 15mV forward detection + 180mΩ on-resistance enables seamless, low-loss switchover from VBUS to battery during input removal or overload |
| Programmable USB current limits | Three discrete modes (100mA/500mA/1A) set via D0/D1/D2 pins and CLPROG resistor - meets USB 2.0, BC1.2, and wall-adapter requirements |
| Thermal regulation & safety | Internal temperature sensing (110°C trip), battery voltage hysteresis (ΔVTRKL = 135mV), and 4-hour safety timer prevent overcharge and thermal runaway |
Applications
| Media Players | Digital Cameras |
|---|---|
Use Scenario: Portable audio/video player requiring continuous playback while charging from USB port. IC Role / Device Role / Timing Role: LTC4088EDE#PBF manages power routing between USB input, Li-ion battery, and system load - delivering up to 1.2A input current while charging at 1.03A. Use Value: Bat-Track™ minimizes charger loss, extending runtime by >15% vs linear solutions; 0.75mm profile fits ultra-thin form factors. |
Use Scenario: Compact digital camera with flash LED and image sensor demanding burst current beyond USB 500mA limit. IC Role / Device Role / Timing Role: LTC4088EDE#PBF supplies peak load current from battery via ideal diode while maintaining USB compliance during charging. Use Value: Internal 180mΩ ideal diode + GATE-driven external PMOS enables <20mV dropout, preventing brownout during flash discharge. |
| GPS Navigation Devices | Smartphones (Accessory Charging) |
Use Scenario: Battery-powered GPS unit operating in vehicle dock (5V) or USB host, requiring cold-start capability and thermal-safe charging. IC Role / Device Role / Timing Role: LTC4088EDE#PBF provides instant-on 3.6V VOUT when BAT < 3.3V and monitors NTC thermistor to pause charging outside –10°C to +45°C range. Use Value: NTC interface with 1.5% hysteresis prevents false thermal faults; 125°C junction limit ensures reliability in enclosed automotive enclosures. |
Use Scenario: Smartphone accessory (e.g., Bluetooth headset, smartwatch dock) drawing power from phone's USB OTG port. IC Role / Device Role / Timing Role: LTC4088EDE#PBF operates in low-power suspend mode (500µA) when host enters USB suspend, preserving accessory battery life. Use Value: Suspend LDO regulates VOUT to 4.6V at ≤500µA, eliminating battery drain during host sleep - extends accessory standby time by 3× vs non-suspend designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB power management and Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Linear charger only (no switching regulator); 1.2A max charge current; no ideal diode or Bat-Track | Requires external DC-DC for system power; limited to 500mA USB input; no battery switchover | Choose for cost-sensitive, low-power applications where VOUT load < 100mA and battery-only operation is not required |
| MAX1555ETA+ | Linear charger with PowerPath; no switching regulator; 500mA max charge; 200mΩ internal diode | No VBUS current limiting beyond USB spec; no programmable modes; lower efficiency under load | Choose for simple, legacy USB 1.1 designs where 2.25MHz switching noise must be avoided and thermal headroom is ample |
Compared with BQ24075RGTR and MAX1555ETA+, the LTC4088EDE#PBF uniquely combines high-efficiency switching regulation, adaptive Bat-Track™ output, and integrated ideal diode - enabling higher system loads, longer runtime, and true seamless power switchover without external FETs or controllers.
Availability
LTC4088EDE#PBF is available at Aetrix Electronics and suitable for media players, digital cameras, GPS navigation devices, and smartphone accessories requiring stable component supply, USB-compliant power management, and single-cell Li-ion charging with thermal safety.
Supply support for LTC4088EDE#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 industrial, automotive, communications, and consumer markets.
The LTC4088EDE#PBF belongs to Linear's PowerPath™ family of battery charging and power management ICs, designed specifically for USB-powered portable electronics requiring efficient, safe, and compact integration of charging, system power, and battery backup.
FAQ
What is the maximum input current limit supported by the LTC4088EDE#PBF?
The LTC4088EDE#PBF supports a maximum input current limit of 1.2A in 10x mode, set via D0=1, D1=0, D2=0 logic configuration and a CLPROG resistor. This enables full utilization of high-power USB wall adapters while maintaining strict average current compliance through its precision hCLPROG current-sense architecture.
How does the Bat-Track™ feature of the LTC4088EDE#PBF improve system efficiency?
The Bat-Track™ feature in the LTC4088EDE#PBF sets VOUT to approximately BAT + 0.3V during charging, minimizing the voltage differential across the battery charger's pass FET. This reduces conduction loss and improves overall efficiency to >88% at 500mA load - critical for extending runtime in battery-powered portable devices.
Can the LTC4088EDE#PBF operate without an external inductor?
No, the LTC4088EDE#PBF requires an external 3.3µH inductor connected between SW and VOUT to implement its 2.25MHz synchronous buck regulator. Omitting the inductor disables the switching regulator, leaving only the ideal diode and LDOs functional - insufficient for system power delivery in most applications.
What is the role of the C/X pin on the LTC4088EDE#PBF?
The C/X pin on the LTC4088EDE#PBF programs the battery charge termination current threshold. When the actual battery current falls below the level set by RC/X (e.g., 1kΩ → 85mA), the CHRG pin asserts to signal end-of-charge. Its 1031× current-sense ratio enables precise, resistor-programmed cutoff without external amplifiers.
Does the LTC4088EDE#PBF support NTC-based battery temperature monitoring?
Yes, the LTC4088EDE#PBF includes a dedicated NTC pin (Pin 1) that interfaces with a negative temperature coefficient thermistor in the battery pack. It monitors voltage thresholds corresponding to cold (<75% VBUS) and hot (>36.4% VBUS) conditions and automatically pauses charging outside the safe range - a mandatory safety feature for certified Li-ion systems.
LTC4088EDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 1.5A
- 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:
- 14-DFN (4x3)
LTC4088EDE#PBF FAQ
1.How can I place an order for LTC4088EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4088EDE#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 LTC4088EDE#PBF reliable?
The price and inventory of LTC4088EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4088EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC4088EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4088EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4088EDE#PBF?
LTC4088EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4088EDE#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 LTC4088EDE#PBF?
For technical support, including LTC4088EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4088EDE#PBF requirements.
6.How does Aetrix verify that LTC4088EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4088EDE#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 LTC4088EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC4088EDE#PBF?
All LTC4088EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4088EDE#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 LTC4088EDE#PBF part is unused and in its original packaging.
Return procedure for LTC4088EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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