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Analog Devices Inc. LTC4095EDC#TRPBF
- Part No.:
- LTC4095EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4095EDC#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,646
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Product details
Overview
LTC4095EDC#TRPBF from Analog Devices (formerly Linear Technology) is a standalone linear lithium-ion/polymer battery charger IC for USB-powered portable devices. It delivers programmable constant-current/constant-voltage charging up to 500mA (HPWR = 5V) or 100mA (HPWR = 0V), features 4.2V ±0.5% float voltage regulation, integrated NTC thermistor monitoring, and thermal feedback limiting die temperature to 115°C - used in media players and cellular phones requiring compact, self-contained charging.
For engineers reviewing the LTC4095EDC#TRPBF datasheet, LTC4095EDC#TRPBF pinout, LTC4095EDC#TRPBF application, or LTC4095EDC#TRPBF equivalent, key selection considerations include its 2mm × 2mm DFN-8 package with exposed pad, C/10 charge termination detection, 8.5µA suspend-mode supply current, bad-battery latching behavior, and HPWR-selectable charge current scaling - all critical for space-constrained, thermally sensitive USB battery systems.
Technical Context
The LTC4095EDC#TRPBF implements a fully autonomous linear charging algorithm with dual-stage CC/CV control, internal safety timer (4-hour termination), and automatic recharge triggered at VFLOAT −95mV. Its PROG pin serves both as programming interface (via resistor-to-ground) and real-time current monitor (IBAT = IPROG × 800).
Thermal regulation activates at ~115°C junction temperature, dynamically reducing charge current without external intervention. The NTC input supports temperature-qualified charging via externally biased thermistor networks, with cold/hot fault thresholds set at 0.765·IN and 0.349·IN respectively, plus 3°C hysteresis per comparator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current Range | 100mA (HPWR = 0V) to 500mA (HPWR = 5V) - enables USB-compliant low/high power modes |
| Float Voltage Accuracy | 4.2V ±0.5% (4.179V–4.221V) - ensures safe, full Li-ion cell capacity without overvoltage stress |
| Suspend Supply Current | 8.5µA - minimizes system standby drain during host sleep or disconnect |
| Safety Timer Duration | 4 hours (3.5–4.5h range) - prevents indefinite charging of defective or deeply discharged cells |
| NTC Fault Thresholds | Cold: 0.765·IN; Hot: 0.349·IN - supports configurable temperature qualification using standard 100k NTCs |
| Thermal Regulation Threshold | Junction temperature ≈115°C - automatically throttles charge current to prevent thermal damage |
| Bad-Battery Detection Time | 0.5 hour (0.4375–0.5625h) - latches fault if battery remains <2.9V after sustained trickle charge |
Pinout & Package
Package: 8-lead 2mm × 2mm plastic DFN with exposed pad (Pin 9), 0.75mm profile, θJA = 60°C/W. Exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (Pin 1) | Battery output node | Delivers regulated 4.2V charge current; connects directly to single-cell Li-ion anode |
| GND (Pin 2) | Power and signal reference | Common return for all internal circuits; tied to exposed pad (Pin 9) |
| CHRG (Pin 3) | Open-drain status indicator | Signals charging (low), C/10 complete (high-Z), NTC fault (35kHz @1.5Hz blink), or bad battery (35kHz @6.1Hz blink) |
| SUSP (Pin 4) | Suspend mode enable | Logic-high (>1.2V) disables charging and resets timer; internal 3.6MΩ pull-down ensures default off-state |
| HPWR (Pin 5) | Charge current scaling select | High (>1.2V) sets full-scale current; low (<0.4V) scales to 20% - enables USB 100mA/500mA compliance |
| NTC (Pin 6) | Temperature sensor input | Monitors bias-ratio across external NTC network; grounding disables thermal qualification |
| PROG (Pin 7) | Current programming & monitoring | 1V (HPWR high) or 0.2V (HPWR low) servo point; IBAT = IPROG × 800 enables gas gauging |
| IN (Pin 8) | Input supply | Accepts 4.3V–5.5V USB source; supports transients up to 7V (1ms); requires ≥1µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Standalone USB charging | No external MCU or firmware required - full CC/CV, timer, and fault handling integrated |
| Thermal feedback loop | Automatically reduces charge current above ~115°C junction temperature - eliminates need for external thermal sensors or derating margins |
| C/10 charge termination | Detects end-of-charge at 10% of programmed current - provides precise, reliable cutoff without voltage-only reliance |
| Bad-battery latching | Halts charging and asserts CHRG blink after 0.5h at <2.9V - prevents unsafe conditioning of failed cells |
| Trickle charge activation | Engages 37–55mA current when BAT <2.8–3.0V - safely recovers deeply discharged batteries before CC mode |
Applications
| Media Players | Cellular Phones |
|---|---|
Use Scenario: Portable audio/video playback device powered by single-cell Li-ion battery with USB-C or micro-USB charging port. IC Role / Device Role / Timing Role: Standalone linear charger managing full CC/CV cycle, thermal regulation, and NTC-based temperature qualification during charging. Use Value: Enables compact 2mm × 2mm footprint and eliminates need for system-level charging control firmware - reducing BOM and development time. |
Use Scenario: Entry-tier smartphone or feature phone requiring USB-powered battery management without dedicated PMIC. IC Role / Device Role / Timing Role: Primary battery charger IC providing HPWR-selectable 100mA/500mA modes compliant with USB 2.0 power specifications. Use Value: Delivers guaranteed 4.2V ±0.5% regulation and automatic recharge at VFLOAT −95mV - maintaining battery health across frequent partial cycles. |
| PDA Systems | Portable Medical Monitors |
Use Scenario: Handheld personal digital assistant with removable Li-ion battery and field-rechargeable operation via USB adapter. IC Role / Device Role / Timing Role: Autonomous charging controller implementing safety timer (4h), bad-battery detection, and suspend-mode current reduction to 8.5µA. Use Value: Ensures fail-safe operation under variable ambient temperatures via NTC monitoring - critical for unattended or remote deployments. |
Use Scenario: Battery-powered vital signs monitor used in ambulatory or home-care settings with intermittent USB charging access. IC Role / Device Role / Timing Role: Low-quiescent linear charger supporting trickle charge (37–55mA) for recovery of low-voltage batteries and C/10 termination for precision cutoff. Use Value: Provides predictable, certified charge behavior without software intervention - simplifying regulatory validation for Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone Li-ion linear charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555ETA+ | Fixed 100mA charge current; no HPWR scaling; 4.2V ±0.75% float voltage; no NTC input | Lacks temperature qualification and programmable current - suitable only for fixed-power, non-thermal-critical designs | Select only if USB 100mA limit is sufficient and thermal monitoring is unnecessary |
| BQ24072RGTR | 500mA max current; 4.2V ±1% accuracy; integrated USB detection; no exposed-pad DFN package | Requires external USB enumeration logic; larger 16-pin QFN package increases board area vs. 2mm × 2mm DFN | Prefer when system-level USB enumeration is already implemented and thermal performance is less constrained |
Compared with MAX1555ETA+ and BQ24072RGTR, the LTC4095EDC#TRPBF uniquely combines HPWR-selectable current, 0.5% float voltage accuracy, NTC thermistor support, and ultra-compact DFN-8 packaging - making it optimal for thermally dense, size-limited USB-charged devices where autonomous, precision charging is mandatory.
Availability
LTC4095EDC#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, media players, cellular handsets, and PDA systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC4095EDC#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 legacy precision analog and power management product lines with full datasheet, reliability, and support continuity.
The LTC4095EDC#TRPBF belongs to Linear's standalone battery charger IC family, designed specifically for space-constrained USB-powered portable electronics needing autonomous, thermally robust, and safety-certifiable Li-ion charging without MCU dependency.
FAQ
What is the maximum charge current supported by the LTC4095EDC#TRPBF?
The LTC4095EDC#TRPBF supports up to 500mA of charge current when the HPWR pin is driven high (≥1.2V), and 100mA when HPWR is low (≤0.4V). This dual-level capability aligns with USB 2.0 power specification limits. The actual current is set by a resistor from PROG to ground, with IBAT = 800 × IPROG. For example, a 1.74kΩ PROG resistor yields 500mA at HPWR = 5V. The LTC4095EDC#TRPBF does not support currents beyond 500mA in any configuration.
How does the LTC4095EDC#TRPBF handle battery temperature monitoring?
The LTC4095EDC#TRPBF uses the NTC pin to interface with an external negative temperature coefficient thermistor network. With a properly biased 100kΩ NTC (e.g., Vishay Curve 1) and matching 100kΩ bias resistor from IN to NTC, it pauses charging below ~0°C (cold threshold) and above ~40°C (hot threshold), each with ~3°C hysteresis. Grounding the NTC pin disables this function. The LTC4095EDC#TRPBF does not digitize temperature - it performs analog ratio-based fault detection only.
What happens when the LTC4095EDC#TRPBF detects a bad battery?
When the LTC4095EDC#TRPBF detects that battery voltage remains below 2.8–3.0V for more than 0.4375–0.5625 hours, it latches a bad-battery fault, terminates charging, and drives the CHRG pin with a 35kHz signal modulated at 6.1Hz (fast blink) to indicate failure. Recovery requires removing and reapplying IN voltage or toggling SUSP. The LTC4095EDC#TRPBF will not attempt further charging until reset - preventing unsafe conditioning of shorted or open-celled batteries.
Can the LTC4095EDC#TRPBF operate from a wall adapter instead of USB?
Yes - the LTC4095EDC#TRPBF accepts 4.3V–5.5V on the IN pin and tolerates transients up to 7V (1ms, <1% duty cycle), making it compatible with regulated 5V wall adapters. Its undervoltage lockout (UVLO) activates below ~3.875–4.125V, and differential UVLO disables charging when IN falls within 25–60mV of BAT voltage. The LTC4095EDC#TRPBF functions identically regardless of whether the source is USB or wall adapter, provided input meets voltage and transient specs.
What is the purpose of the exposed pad (Pin 9) on the LTC4095EDC#TRPBF?
The exposed pad (Pin 9) on the LTC4095EDC#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour designated as ground to ensure proper thermal dissipation (θJA = 60°C/W) and stable operation. Leaving it unconnected degrades thermal performance and may cause premature thermal regulation or malfunction. The LTC4095EDC#TRPBF datasheet explicitly states "EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB" - no alternative mounting is specified or supported.
LTC4095EDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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:
- -
- 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:
- 8-DFN (2x2)
LTC4095EDC#TRPBF FAQ
1.How can I place an order for LTC4095EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4095EDC#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 LTC4095EDC#TRPBF reliable?
The price and inventory of LTC4095EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4095EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4095EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4095EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4095EDC#TRPBF?
LTC4095EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4095EDC#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 LTC4095EDC#TRPBF?
For technical support, including LTC4095EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4095EDC#TRPBF requirements.
6.How does Aetrix verify that LTC4095EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4095EDC#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 LTC4095EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4095EDC#TRPBF?
All LTC4095EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4095EDC#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 LTC4095EDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC4095EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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