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Analog Devices Inc. LTC4088EDE-2#TRPBF
- Part No.:
- LTC4088EDE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC4088EDE-2#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,601
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Product details
Overview
LTC4088EDE-2#TRPBF 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 regulator, ideal diode, and thermal/NTC monitoring. It delivers up to 1.5A charge current, maintains regulated 3.6V VOUT during low-battery "instant-on" operation, and supports programmable input current limits (100mA/500mA/1A) for USB compliance. It is used in portable media players, GPS units, and smart phones requiring seamless power path management between USB input and single-cell battery.
For engineers reviewing the LTC4088EDE-2#TRPBF datasheet, LTC4088EDE-2#TRPBF pinout, LTC4088EDE-2#TRPBF application, or LTC4088EDE-2#TRPBF equivalent, key selection considerations include its Bat-Track™ adaptive output control, 14-pin DFN package with exposed thermal pad, 2.25MHz switching frequency, ±1% float voltage accuracy (4.200V), and default-on-charger behavior distinguishing it from the LTC4088-1 variant.
Technical Context
The LTC4088EDE-2#TRPBF implements a constant-frequency (1.8–2.7MHz) synchronous buck regulator with precision average input current limiting via CLPROG feedback, enabling strict adherence to USB 2.0 current specifications. Its PowerPath architecture dynamically partitions available input power between system load (VOUT) and battery charging, prioritizing VOUT while reducing charge current as needed to maintain regulation.
It integrates a full-featured linear battery charger with CC/CV profile, safety timer (3.2–4.8h), trickle charge (2.7–3.0V threshold), NTC-based temperature supervision, and end-of-charge detection via C/X pin. The internal 180mΩ ideal diode and external PMOS gate driver (GATE pin) ensure uninterrupted system power during VBUS removal or overload conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VBUS = 4.35V to 5.5V (7V transient max); enables direct connection to standard USB 2.0 ports and 5V wall adapters. |
| Max Input Current Limit | Programmable up to 1A via D0/D1/D2 logic; ensures compliance with USB high-power mode without violating host port limits. |
| Battery Charge Current | Up to 1.5A with thermal limiting; set by PROG resistor (e.g., 1kΩ → ~1.03A); supports fast charging of single-cell Li-ion packs. |
| VOUT Regulation | 3.6V fixed during low-battery instant-on (BAT ≤ 3.3V); otherwise tracks BAT + 0.3V for >90% charging efficiency. |
| Switching Frequency | Typ. 2.25MHz; allows use of small 3.3µH inductors and compact 10µF MLCC output capacitors for space-constrained designs. |
| Package | 14-lead 4mm × 3mm × 0.75mm DFN with exposed thermal pad; provides low θJA (37°C/W) for thermal management in sealed portable enclosures. |
| Operating Temp Range | –40°C to +85°C; qualified for industrial and consumer portable applications including automotive-dock environments. |
Pinout & Package
Package: 14-lead plastic DFN (4mm × 3mm × 0.75mm) with exposed thermal pad (Pin 15 = GND). Requires soldering of exposed pad for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBUS (11) | USB/wall adapter input supply | Primary power source; monitored for UVLO (4.3V rise/4.0V fall) and current-limited via CLPROG feedback loop. |
| VOUT (10) | Main system power output | Regulated output powering application load; dynamically adjusted between 3.6V (low-BAT) and BAT+0.3V (normal) for efficiency. |
| BAT (9) | Single-cell Li-ion battery terminal | Charged via internal FET (RON = 0.18Ω); supplies VOUT via ideal diode when VBUS is absent or overloaded. |
| PROG (6) | Charge current programming & monitor | 1V servo voltage sets IBAT = (VPROG/RPROG) × 1031; enables accurate, resistor-programmed constant-current charging. |
| CLPROG (2) | Input current limit programming & monitor | 1.188V servo point; RCLPROG sets USB current limit (e.g., 2.94kΩ → 500mA in 5x mode) with hCLPROG ratio compensation. |
| GATE (8) | External PMOS gate driver | Drives external P-channel MOSFET (e.g., Si2333) for low-loss ideal diode path from BAT to VOUT; supports <30mΩ RDS(on). |
| CHRG (7) | Open-drain charge status indicator | 35kHz modulated output signaling charge active, float, bad battery, or NTC fault; requires external pull-up/LED. |
| NTC (1) | Battery temperature sensing input | Connects to thermistor network; pauses charging if battery is outside safe range (e.g., VCOLD = 75–78% VBUS, VHOT = 33–36% VBUS). |
Key Features
| Feature | Design Value |
|---|---|
| Bat-Track™ Adaptive Output Control | VOUT dynamically tracks BAT + 0.3V above 3.3V, minimizing charger conduction loss and improving overall system efficiency by >5% vs fixed-output regulators. |
| Programmable USB Input Current Limit | Three discrete modes (100mA/500mA/1A) selected via D0/D1/D2 pins; eliminates need for external current-sense amplifiers or complex digital configuration. |
| Integrated Ideal Diode + External Gate Driver | 180mΩ internal diode plus GATE pin driving external PMOS enables seamless switchover to battery power with <15mV forward drop and no reverse leakage. |
| Low-Battery Instant-On Regulation | Maintains stable 3.6V VOUT even at BAT = 2.7V, allowing immediate system boot without waiting for battery recharge - critical for GPS and emergency devices. |
| Thermal & NTC-Based Battery Safety | On-chip thermal limiting (110°C junction) and configurable NTC monitoring prevent overtemperature charging; supports JEITA-compliant charge profiles. |
Applications
| Portable Media Player Power Management | Digital Camera Battery Charging |
|---|---|
Use Scenario: Continuous audio/video playback powered by USB while simultaneously charging a 3.7V Li-ion battery. IC Role / Device Role / Timing Role: LTC4088EDE-2#TRPBF acts as USB power manager and battery charger, regulating VOUT to 3.6V during low-BAT playback and scaling charge current to avoid exceeding 500mA USB limit. Use Value: Enables uninterrupted operation and full battery recharge within 2.5 hours using standard USB 2.0 host port, eliminating need for separate AC adapter. |
Use Scenario: High-current burst capture (flash, sensor readout) drawing >800mA from VOUT while battery is charging from USB. IC Role / Device Role / Timing Role: LTC4088EDE-2#TRPBF supplies peak load current from both VBUS and BAT via ideal diode path, while dynamically reducing charge current to maintain 500mA average input. Use Value: Prevents brownout during flash discharge and ensures camera remains responsive; reduces thermal stress on battery and IC via adaptive charge current throttling. |
| GPS Navigation Device Power Path | Smartphone Peripheral Dock Charger |
Use Scenario: GPS unit operating in cold ambient (–20°C) with battery temperature below safe charging threshold. IC Role / Device Role / Timing Role: LTC4088EDE-2#TRPBF monitors NTC voltage, halts charging when VCOLD < 75% VBUS, and continues powering GPS from VBUS or battery via ideal diode. Use Value: Ensures reliable navigation functionality in sub-zero conditions without risking battery damage; maintains VOUT stability during NTC fault events. |
Use Scenario: Docking station delivering 5V USB power to smartphone while charging its battery and powering connected accessories (e.g., USB-C hub). IC Role / Device Role / Timing Role: LTC4088EDE-2#TRPBF manages shared power budget between phone battery and hub load, using Bat-Track to maximize charging efficiency while sustaining 1.2A accessory current. Use Value: Eliminates need for dual-path power ICs; supports simultaneous fast charging and peripheral operation from single USB-C upstream port. |
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 |
|---|---|---|---|
| BQ24075RGER | Fixed 500mA input limit; no programmable multi-mode USB current control; lacks Bat-Track and ideal diode gate driver. | Suitable only for fixed-configuration USB-powered devices without dynamic load sharing or battery backup requirements. | Select BQ24075RGER only for cost-sensitive, low-feature applications where VOUT must remain fixed and battery backup is not required. |
| MAX1555ESA+ | Linear charger only (no switching regulator); max 100mA input current; no ideal diode or NTC support; SO-8 package. | Limited to ultra-low-power USB bus-powered devices (e.g., Bluetooth headsets) with minimal load and no thermal safety needs. | Choose MAX1555ESA+ only for simple, low-current applications where PCB area and thermal dissipation are less constrained than in portable media or GPS designs. |
Compared with BQ24075RGER and MAX1555ESA+, the LTC4088EDE-2#TRPBF uniquely combines programmable USB current limiting, Bat-Track adaptive output, integrated ideal diode, and NTC monitoring in a thermally optimized DFN package - making it the only option supporting high-efficiency, battery-backed, USB-compliant operation across wide ambient and load conditions.
Availability
LTC4088EDE-2#TRPBF is available at Aetrix Electronics and suitable for portable media players, GPS navigation devices, and digital cameras requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC4088EDE-2#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, serving industrial, automotive, communications, and consumer markets.
The LTC4088-2 belongs to Linear's PowerPath™ USB power management product line, designed specifically to solve power arbitration challenges in battery-backed portable electronics where USB input must coexist with high-efficiency charging and uninterrupted system operation.
FAQ
What is the key functional difference between LTC4088EDE-2#TRPBF and LTC4088EDE-1#TRPBF?
The LTC4088EDE-2#TRPBF powers up with the battery charger enabled by default (D2=0 in 000 state), whereas the LTC4088EDE-1#TRPBF powers up with the charger disabled (D2=1). This makes LTC4088EDE-2#TRPBF ideal for applications requiring immediate charging upon power-up, such as docked peripherals or always-on GPS units. Both share identical pinout, specs, and package.
How does LTC4088EDE-2#TRPBF maintain VOUT regulation when the battery voltage drops below 3.3V?
The LTC4088EDE-2#TRPBF implements a low-battery "instant-on" mode that forces VOUT to regulate at a fixed 3.6V when BAT falls below 3.3V - independent of the Bat-Track function. This ensures system processors and displays remain powered during deep discharge, preventing unexpected shutdown before recharge begins. The feature activates automatically without external control.
Can LTC4088EDE-2#TRPBF operate from a 4.5V input, and what happens if VBUS drops below specification?
Yes - the LTC4088EDE-2#TRPBF operates with VBUS as low as 4.35V (min). If VBUS falls below the 4.0V falling UVLO threshold, the switching regulator disables and system power seamlessly transfers to the battery via the internal and external ideal diodes. VOUT remains stable as long as BAT ≥ 2.7V, ensuring uninterrupted operation during transient input dips.
What external components are mandatory for basic LTC4088EDE-2#TRPBF operation?
Four components are mandatory: (1) 10µF MLCC on VOUT for loop stability, (2) 3.3µH shielded inductor between SW and VOUT, (3) 2.94kΩ 1% resistor from CLPROG to GND for 500mA USB mode, and (4) 1kΩ 1% resistor from PROG to GND for ~1.03A charge current. The NTC network and external PMOS are optional but recommended for full safety and efficiency.
Does LTC4088EDE-2#TRPBF support USB suspend mode, and how is it implemented?
Yes - LTC4088EDE-2#TRPBF supports two USB suspend modes (high-power: 2.5mA; low-power: 500µA) activated when D0=D1=1. In suspend, the switching regulator shuts down and a dedicated LDO regulates VOUT to 4.6V, drawing current directly from VBUS. CLPROG servo voltage drops to ~100mV, enabling detection of suspend state by host controllers.
LTC4088EDE-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 14-WFDFN 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:
- 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-2#TRPBF FAQ
1.How can I place an order for LTC4088EDE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4088EDE-2#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 LTC4088EDE-2#TRPBF reliable?
The price and inventory of LTC4088EDE-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4088EDE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4088EDE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4088EDE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4088EDE-2#TRPBF?
LTC4088EDE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4088EDE-2#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 LTC4088EDE-2#TRPBF?
For technical support, including LTC4088EDE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4088EDE-2#TRPBF requirements.
6.How does Aetrix verify that LTC4088EDE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4088EDE-2#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 LTC4088EDE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4088EDE-2#TRPBF?
All LTC4088EDE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4088EDE-2#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 LTC4088EDE-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4088EDE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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