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Analog Devices Inc. LTC1730ES8-4.2#TRPBF
- Part No.:
- LTC1730ES8-4.2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1730ES8-4.2#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,625
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Product details
Overview
LTC1730ES8-4.2 from Analog Devices (formerly Linear Technology) is a standalone 1-cell lithium-ion pulse charger IC with integrated 0.35Ω NMOS pass switch, 4.2V ±1% float voltage regulation, C/10 end-of-charge detection, and programmable timer-based charge termination. It operates from 4.5V to 12V input and delivers up to 1A charge current with external sense resistor limiting.
For engineers reviewing the LTC1730ES8-4.2 datasheet, LTC1730ES8-4.2 pinout, LTC1730ES8-4.2 application, or LTC1730ES8-4.2 equivalent, this page provides verified technical context, validated pin functions, real-world use cases for handheld and portable Li-ion systems, and two confirmed alternative parts with documented functional differences.
Technical Context
The LTC1730ES8-4.2 implements a constant-current/constant-voltage (CC/CV) pulse charging algorithm using an internal charge pump–driven NMOS switch. It initiates trickle charge at ≤2.45V battery voltage, transitions to fast charge when VBAT exceeds that threshold, and terminates based on either timer expiry or C/10 duty-cycle detection at the GATE pin.
Thermal shutdown activates at ~140°C with 5°C hysteresis; battery temperature qualification uses an NTC thermistor on the NTC/SHDN pin with hot/cold thresholds of 2.0V and 3.5V (at VCC = 4V). The device enters <1µA sleep mode when input is removed and supports automatic battery refresh upon 150mV voltage drop below full-charge VBAT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.2V ±1% (4.158V–4.242V); ensures precise cell termination without overvoltage stress |
| Max Charge Current | 1A (with RSENSE = 0.1Ω); set by external sense resistor for safety-critical current limiting |
| Internal Switch RDS(ON) | 0.35Ω (at VBAT = 4V); enables low-loss fast charging without external blocking diode |
| End-of-Charge Detection | C/10 average current threshold; signaled via CHRG pin state change for microcontroller monitoring |
| Timer Accuracy | ±10% (with CTIMER = 0.1µF); sets total charge duration, minimum ON/OFF times, and overcurrent retry period |
| Quiescent Drain (Sleep) | <1µA (max); preserves battery life during adapter disconnection in portable devices |
| Operating Temp Range | –40°C to 85°C; qualified for industrial and consumer handheld environments |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150″), JEDEC MS-012AC, thermal pad not present; θJA ≈ 80°C/W with 2500mm² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE | Overcurrent sense input | Voltage across external RSENSE; >100mV triggers immediate GATE shutdown and 400ms retry cycle |
| 2 - VCC | Positive input supply | 4.5V–12V input; requires 1µF bypass + 4.7Ω RC network to GATE for slew control and inrush limiting |
| 3 - CHRG | Open-drain charge status output | Pulled low during fast charge; weak 40µA pull-down at C/10; high-Z at timeout or sleep |
| 4 - GND | Electrical and thermal ground | Primary heat path; requires large copper pour and vias for thermal management |
| 5 - TIMER | Timer capacitor connection | CTIMER to ground sets total charge time: tHRS = 3 × (CTIMER/0.1µF) |
| 6 - NTC/SHDN | NTC thermistor input / shutdown control | Detects battery temperature; pulled <50mV forces shutdown; 2.0V/3.5V thresholds for hot/cold hold |
| 7 - GATE | Internal NMOS gate drive output | 10µA charge pump source / 40µA sink; clamped to 12V above BAT; drives external FET if needed |
| 8 - BAT | Battery voltage sense and regulation feedback | Internally regulated to 4.2V; clamped to 4.7V if battery disconnected; recharges at VBAT − 150mV |
Key Features
| Feature | Design Value |
|---|---|
| No blocking diode required | Internal NMOS body tied to GND eliminates reverse-battery conduction path, reducing BOM cost and power loss |
| Automatic trickle-to-fast charge transition | 35mA fixed-current trickle mode activates below 2.45V; seamless transition to CC/CV when threshold exceeded |
| Defective battery detection | Terminates charge if VBAT remains <2.45V for ≥25% of programmed timer duration, signaling faulty cell |
| Programmable thermal hold | Freezes timer and suspends charging when NTC/SHDN voltage falls outside 2.0V–3.5V window (at VCC=4V) |
| Low-power sleep mode | Drains <1µA from battery when VCC is absent-critical for long-term storage in portable electronics |
Applications
| Handheld Computers | Cellular Telephones |
|---|---|
Use Scenario: Compact, battery-powered computing device requiring safe, autonomous Li-ion charging without host MCU intervention. IC Role / Device Role / Timing Role: Standalone CC/CV pulse charger managing full charge cycle-including trickle, fast, and termination-via analog control loop. Use Value: Eliminates need for software-controlled charging firmware; reduces system-level complexity and BOM count. |
Use Scenario: Dual-mode mobile phone supporting both wall adapter and USB charging, with strict thermal and safety constraints. IC Role / Device Role / Timing Role: Primary Li-ion charger IC providing overtemperature hold, C/10 detection, and sleep-mode battery preservation. Use Value: Enables reliable field operation across ambient temperatures while meeting IEC 62133 safety requirements. |
| Portable Medical Devices | Wearable Electronics |
Use Scenario: Battery-powered glucose monitor or pulse oximeter requiring certified, low-risk charging architecture. IC Role / Device Role / Timing Role: Safety-certifiable charger implementing NTC-based thermal qualification and automatic refresh after self-discharge. Use Value: Meets medical-grade reliability expectations through hardware-enforced charge limits and fault latching. |
Use Scenario: Smartwatch or fitness tracker with space-constrained PCB and aggressive power budgeting. IC Role / Device Role / Timing Role: Ultra-low-quiescent charger enabling multi-week standby with minimal battery drain during adapter removal. Use Value: Extends usable shelf life and user experience between charges without compromising safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1731CMS8#PBF | Controller-only (no internal MOSFET); requires external NMOS; supports 4.1V/4.2V selection via SEL pin | Used where higher current (>1A) or custom thermal layout is needed; lacks integrated switch and sleep-mode drain spec | Select when design requires >1A charge current or discrete MOSFET optimization for thermal performance |
| MAX1555ESA+ | Fixed 4.2V output; no NTC/SHDN pin; integrates wall-adapter presence detection (ACPR); 500mA max current | Simpler implementation for cost-sensitive, non-temperature-qualified applications; no thermal hold or refresh capability | Select for basic USB/wall-adapter charging where battery temperature monitoring is unnecessary and current ≤500mA |
Compared with LTC1730ES8-4.2, LTC1731CMS8#PBF offers higher scalability but adds layout complexity and external component count, while MAX1555ESA+ simplifies design at the expense of thermal safety and refresh functionality-making LTC1730ES8-4.2 optimal for robust, self-contained 1A Li-ion charging in temperature-variable environments.
Availability
LTC1730ES8-4.2 is available at Aetrix Electronics and suitable for handheld computers, cellular telephones, and portable medical devices requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1730ES8-4.2 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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1730 series.
The LTC1730 family was designed specifically for autonomous, single-cell Li-ion charging in space- and power-constrained portable electronics-emphasizing analog control integrity, thermal resilience, and minimal external component count.
FAQ
What is the exact float voltage accuracy of the LTC1730ES8-4.2?
The LTC1730ES8-4.2 delivers 4.2V ±1% (4.158V–4.242V) float voltage regulation over –40°C to 85°C and 5V–12V input range. This tight tolerance ensures compliance with standard Li-ion cell specifications and prevents overcharging-induced degradation or safety hazards.
Does the LTC1730ES8-4.2 require an external blocking diode?
No, the LTC1730ES8-4.2 does not require an external blocking diode. Its internal NMOS switch has the body tied to GND-not the source-eliminating the parasitic body diode path from BAT to VCC. This architecture prevents reverse battery current if VCC shorts to ground, reducing component count and power loss.
How does the LTC1730ES8-4.2 detect end-of-charge?
The LTC1730ES8-4.2 detects end-of-charge by monitoring the duty cycle at the GATE pin. When the average charge current drops to C/10 (10% of full-scale current), the internal comparator triggers and switches the CHRG pin from strong N-MOSFET pull-down to a 40µA weak current source-providing a clear hardware signal for microcontroller polling.
What happens to the LTC1730ES8-4.2 when input voltage is removed?
When input voltage is removed, the LTC1730ES8-4.2 enters sleep mode with battery current drain <1µA (max). The internal resistor divider disconnects from BAT, the charge pump disables, and all switching ceases-preserving battery capacity during storage or adapter disconnection in portable systems.
Can the LTC1730ES8-4.2 support battery temperature monitoring?
Yes, the LTC1730ES8-4.2 supports battery temperature monitoring via the NTC/SHDN pin. With a 10kΩ NTC thermistor to GND and 4.1kΩ resistor to VCC, it holds charging when voltage falls below 2.0V (hot) or rises above 3.5V (cold) at VCC = 4V, freezing the timer and maintaining CHRG status until temperature returns to range.
LTC1730ES8-4.2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant, Pulsed
- Programmable Features:
- Timer
- Fault Protection:
- Over Current
- Charge Current - Max:
- 1A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 12V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1730ES8-4.2#TRPBF FAQ
1.How can I place an order for LTC1730ES8-4.2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1730ES8-4.2#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of LTC1730ES8-4.2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1730ES8-4.2#TRPBF is usually 5 days.
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5.How can I obtain technical support or documentation for LTC1730ES8-4.2#TRPBF?
For technical support, including LTC1730ES8-4.2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1730ES8-4.2#TRPBF requirements.
6.How does Aetrix verify that LTC1730ES8-4.2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1730ES8-4.2#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 LTC1730ES8-4.2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1730ES8-4.2#TRPBF?
All LTC1730ES8-4.2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1730ES8-4.2#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 LTC1730ES8-4.2#TRPBF part is unused and in its original packaging.
Return procedure for LTC1730ES8-4.2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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