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Analog Devices Inc. LTC1730EGN-4#TRPBF
- Part No.:
- LTC1730EGN-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1730EGN-4#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
LTC1730EGN-4#TRPBF from Analog Devices (formerly Linear Technology) is a standalone 1-cell lithium-ion pulse charger IC with integrated 0.35Ω NMOS pass switch, programmable 4.1V/4.2V float voltage via SEL pin, C/10 end-of-charge detection, and thermal shutdown at 140°C. It operates from 4.5V to 12V input and delivers up to 1.3A charge current with external sense resistor, used in handheld computers and cellular telephones.
For engineers reviewing the LTC1730EGN-4#TRPBF datasheet, LTC1730EGN-4#TRPBF pinout, LTC1730EGN-4#TRPBF application, or LTC1730EGN-4#TRPBF equivalent, key selection considerations include its SSOP-16 package, dual-voltage float programming, ACPR/FAULT status outputs, battery temperature qualification via NTC/SHDN, and absence of required blocking diode due to internal reverse-current protection.
Technical Context
The LTC1730EGN-4#TRPBF implements a constant-current/constant-voltage (CC/CV) pulse charging algorithm using an internal charge pump–driven NMOS switch. Its gate drive employs 10µA/40µA controlled slew-rate current sources tied to an external RC network between GATE and VCC pins to manage inrush and dissipation.
Charge termination relies on three independent mechanisms: duty-cycle–based C/10 detection at the GATE pin, programmable timer (tTIMER = 3 hr × CTIMER/0.1µF), and fault latching for defective batteries (VBAT < 2.45V for ≥25% of timer duration) or out-of-range NTC thermistor voltage (hot threshold: 1.95–2.05V; cold: 3.4–3.6V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 12V - supports standard wall adapters without external regulation |
| Float Voltage Accuracy | ±1% - ensures precise 4.1V (SEL = GND) or 4.2V (SEL = VCC) cell termination |
| Max Charge Current | 1.3A (RSENSE = 0.1Ω) - sets safe overcurrent limit independent of adapter current rating |
| Internal Switch RDS(ON) | 0.35Ω - enables high-efficiency fast charging with minimal heat generation |
| Shutdown Current | <1µA - preserves battery life during input removal via sleep mode |
| Thermal Shutdown | 140°C with 5°C hysteresis - protects die under sustained high-power operation |
| Timer Accuracy | ±10% - determines total charge duration, minimum ON/OFF times, and overcurrent retry period |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0.150-inch narrow body, with four fused corner GND pins for enhanced thermal sinking to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Ground reference and thermal path | Four dedicated thermal pads must connect to expanded PCB copper lands for junction-to-ambient θJA = 90°C/W |
| SENSE (Pin 2) | Overcurrent sense input | Voltage drop across external RSENSE triggers immediate GATE shutdown if >100mV |
| VCC (Pin 3) | Main supply input | Requires 1µF bypass capacitor + 4.7Ω series resistor; ramps under controlled slew rate during switching |
| ACPR (Pin 4) | Wall adapter present indicator | Open-drain output pulled low when VCC − VBAT > 40mV, with 80ms debounce |
| FAULT (Pin 5) | Fault condition indicator | Latched open-drain output signaling NTC out-of-range or defective battery (VBAT < 2.45V for ≥25% timer) |
| CHRG (Pin 6) | Charge status output | Three-state: active-low during fast charge, 40µA pull-down at C/10, high-Z at timeout or input removal |
| NC (Pins 7, 14) | No internal connection | May be grounded to improve thermal conduction but electrically inert |
| TIMER (Pin 10) | Timer capacitor interface | External CTIMER to ground sets total charge time: t = 3 hr × CTIMER/0.1µF |
| NTC/SHDN (Pin 11) | Temperature sensing / shutdown control | Accepts 10kΩ NTC thermistor; pulls low to force shutdown (V < 50mV) or suspend charge (V < 2V or > 3.5V) |
| SEL (Pin 12) | Float voltage selection | GND = 4.1V, VCC = 4.2V - enables compatibility with multiple Li-ion chemistries |
| GATE (Pin 13) | Pass transistor gate driver | Charge-pump–driven output controlling internal NMOS; requires RC network to VCC for slew control |
| BAT (Pin 15) | Battery voltage sense | Clamped to 4.7V if disconnected; triggers automatic recharge when VBAT drops 150mV below float voltage |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.35Ω NMOS switch | Eliminates need for external blocking diode and reduces power loss in fast-charge mode |
| Programmable 4.1V/4.2V float voltage | Single-pin SEL configuration supports diverse Li-ion cell specifications without redesign |
| Trickle charge with 2.45V threshold | Automatically applies 35mA pre-charge to deeply discharged cells before CC mode entry |
| Dual-status open-drain outputs (ACPR, FAULT) | Enables system-level monitoring of adapter presence and safety-critical fault conditions |
| Automatic battery refresh | Reinitiates full charge cycle when VBAT falls 150mV below float voltage post-termination |
| Thermal shutdown with hysteresis | Prevents thermal runaway by disabling GATE at 140°C and re-enabling only after 135°C cooldown |
Applications
| Handheld Computers | Cellular Telephones |
|---|---|
Use Scenario: Portable computing device requiring compact, efficient single-cell Li-ion charging with minimal BOM count. IC Role / Device Role / Timing Role: Primary CC/CV pulse charger managing full charge cycle, temperature qualification, and end-of-charge signaling. Use Value: Eliminates external blocking diode and discrete MOSFET, reducing board area and thermal load while supporting 4.1V/4.2V cell variants. |
Use Scenario: Mobile phone battery management system needing reliable charge termination and adapter presence detection. IC Role / Device Role / Timing Role: Standalone charger IC providing ACPR indication, FAULT latching, and C/10–based charge completion signal to host processor. Use Value: Enables accurate battery state reporting and safe thermal cutoff without microcontroller intervention during charging. |
| Portable Medical Devices | Wearable Electronics |
Use Scenario: Battery-powered diagnostic tool requiring low-quiescent-current sleep mode and precise voltage regulation. IC Role / Device Role / Timing Role: Primary Li-ion charger with <1µA battery drain in sleep mode and ±1% float voltage accuracy for stable runtime calibration. Use Value: Extends shelf life and operational readiness by minimizing self-discharge during storage or standby. |
Use Scenario: Compact wearable with space-constrained PCB and strict thermal limits. IC Role / Device Role / Timing Role: Integrated charger delivering 1.3A peak current with internal 0.35Ω switch and thermal shutdown at 140°C. Use Value: Avoids external heatsinking requirements while maintaining safe operating temperature in sealed enclosures. |
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 |
|---|---|---|---|
| LTC1730ES8-4.2 | 8-pin SO package; fixed 4.2V float; no SEL, ACPR, or FAULT pins; lacks NTC qualification circuitry | Suitable for cost-sensitive, space-constrained designs where dual-voltage support and advanced fault reporting are unnecessary | Select when simplified 4.2V-only charging suffices and SSOP-16 footprint is unavailable |
| LTC4054-4.2 | 500mA max charge current; no programmable timer; no ACPR/FAULT outputs; uses linear topology instead of pulse switching | Targeted at ultra-low-power portable devices where thermal budget prohibits switching losses | Choose for sub-500mA applications requiring minimal external components and lower EMI |
Compared with LTC1730ES8-4.2 and LTC4054-4.2, the LTC1730EGN-4#TRPBF provides higher current capability (1.3A), dual-voltage flexibility, comprehensive fault diagnostics, and superior thermal efficiency-making it optimal for performance-oriented portable systems requiring robust safety and configurability.
Availability
LTC1730EGN-4#TRPBF is available at Aetrix Electronics and suitable for handheld computers, cellular telephones, and portable medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1730EGN-4#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 precision analog and power management portfolio. Linear pioneered high-performance battery charger ICs with integrated switches and intelligent safety features.
The LTC1730EGN-4#TRPBF belongs to Linear's standalone Li-ion charger family, designed specifically for compact, thermally constrained portable electronics requiring autonomous, high-accuracy charging without microcontroller supervision.
FAQ
What is the function of the SEL pin on the LTC1730EGN-4#TRPBF?
The SEL pin on the LTC1730EGN-4#TRPBF selects the regulated float voltage: grounding SEL sets 4.1V, while connecting it to VCC configures 4.2V. This allows a single design to support different lithium-ion cell chemistries without hardware changes. The threshold is 0.7V, ensuring reliable logic-level recognition across operating conditions. This feature is unique to the LTC1730EGN-4#TRPBF variant and not present in the LTC1730ES8-4.2.
How does the LTC1730EGN-4#TRPBF detect end-of-charge?
The LTC1730EGN-4#TRPBF detects end-of-charge by monitoring the duty cycle at the GATE pin; when it falls below 10%, the internal comparator triggers C/10 mode, turning off the CHRG pin's strong pull-down and enabling a 40µA weak current source to ground. This occurs independently of timer expiration and is disabled during trickle charge. The LTC1730EGN-4#TRPBF also supports timer-based termination and automatic recharge if VBAT drops 150mV below float voltage post-termination.
Does the LTC1730EGN-4#TRPBF require an external blocking diode?
No, the LTC1730EGN-4#TRPBF does not require an external blocking diode because its internal NMOS switch has the body tied to ground-not the source-eliminating the parasitic body diode path from BAT to VCC. This architecture prevents reverse battery current flow even if VCC is shorted to ground, reducing BOM count, power loss, and thermal stress. This design advantage is confirmed in the functional description and absolute maximum ratings of the LTC1730EGN-4#TRPBF datasheet.
What is the purpose of the ACPR pin on the LTC1730EGN-4#TRPBF?
The ACPR (Adapter Present) pin on the LTC1730EGN-4#TRPBF is an open-drain output that pulls low when the input supply voltage exceeds the battery voltage by at least 40mV-indicating valid wall adapter connection. It includes an internal 80ms debounce delay to reject noise-induced false triggers. After input removal, ACPR transitions to high-impedance. This signal enables host systems to distinguish between charging and battery-only operation, a feature absent in the 8-pin LTC1730ES8-4.2 variant.
How does the LTC1730EGN-4#TRPBF handle battery temperature monitoring?
The LTC1730EGN-4#TRPBF uses the NTC/SHDN pin to monitor battery temperature via a 10kΩ NTC thermistor. It suspends charging if the pin voltage falls below 2.0V (hot threshold) or rises above 3.5V (cold threshold) with VCC = 4V, freezing the timer and preserving CHRG status. A separate 50mV threshold forces full shutdown. These thresholds are factory-trimmed and specified over temperature, enabling reliable thermal qualification without external comparators. This functionality is integral to the LTC1730EGN-4#TRPBF's safety architecture.
LTC1730EGN-4#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (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:
- 16-SSOP
LTC1730EGN-4#TRPBF FAQ
1.How can I place an order for LTC1730EGN-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1730EGN-4#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 LTC1730EGN-4#TRPBF reliable?
The price and inventory of LTC1730EGN-4#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1730EGN-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1730EGN-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1730EGN-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1730EGN-4#TRPBF?
LTC1730EGN-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1730EGN-4#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 LTC1730EGN-4#TRPBF?
For technical support, including LTC1730EGN-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1730EGN-4#TRPBF requirements.
6.How does Aetrix verify that LTC1730EGN-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1730EGN-4#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 LTC1730EGN-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1730EGN-4#TRPBF?
All LTC1730EGN-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1730EGN-4#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 LTC1730EGN-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC1730EGN-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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