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Analog Devices Inc. LTC1730ES8-4.2#PBF
- Part No.:
- LTC1730ES8-4.2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1730ES8-4.2#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:199
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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, supports battery temperature monitoring via NTC thermistor, and delivers up to 1A charge current with external sense resistor. Used in handheld computers and cellular telephones for compact, thermally efficient charging.
For engineers reviewing the LTC1730ES8-4.2 datasheet, LTC1730ES8-4.2 pinout, LTC1730ES8-4.2 application, or LTC1730ES8-4.2 equivalent, key selection criteria include its 8-pin SO package, absence of blocking diode requirement, 1µA sleep-mode battery drain, automatic trickle-to-fast charge transition at 2.45V, and thermal shutdown at 140°C - all critical for space-constrained portable Li-ion systems.
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 senses overcurrent via external RSENSE (100mV threshold), detects end-of-charge by monitoring GATE duty cycle falling below 10%, and uses a single CTIMER capacitor to set total charge time, minimum on/off periods, and overcurrent retry interval.
Its NTC/SHDN pin provides dual-function interface: analog voltage monitoring for battery temperature qualification (2.0V hot / 3.5V cold thresholds at VCC = 4V) and digital shutdown control (50mV threshold). The BAT pin includes 150mV auto-recharge hysteresis and internal 4.2V reference divider, while the CHRG pin delivers three-state open-drain status (fast charge, C/10, high-Z).
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); sets hard overcurrent limit independent of wall adapter rating |
| Internal Switch RDS(ON) | 0.35Ω (at VBAT = 4V); enables low-loss fast charging without external MOSFET or blocking diode |
| Sleep Mode Drain | <1µA (max); preserves battery capacity when input supply is removed |
| Charge Termination | C/10 detection + programmable timer; dual-condition safety cutoff prevents overcharge |
| Thermal Shutdown | 140°C with 5°C hysteresis; protects die during sustained high-power operation |
| Operating Temp Range | –40°C to 85°C; qualified for industrial and consumer portable environments |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150-inch width), JEDEC MS-012 variant, θJA ≈ 80°C/W with 2500mm² copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE (1) | Overcurrent sense input | Detects 100mV drop across external RSENSE; triggers immediate GATE shutdown on overcurrent |
| VCC (2) | Positive input supply | 4.5V–12V input; requires RC bypass (1µF + 4.7Ω) and GATE–VCC slew-rate network |
| CHRG (3) | Open-drain charge status | Three-state output: active-low fast charge, 40µA C/10 sink, high-Z timeout/sleep |
| GND (4) | Ground reference & thermal path | Primary heat conduction path; requires large copper pour and thermal vias |
| TIMER (5) | Timer capacitor connection | CTIMER to ground sets total charge time: t(HR) = 3 × (CTIMER / 0.1µF) |
| NTC/SHDN (6) | Temp sensing / shutdown input | Analog NTC interface (2.0V/3.5V thresholds) or digital shutdown (≤50mV) |
| GATE (7) | Internal NMOS gate drive | Charge-pump–driven output; clamped to 12V above BAT; controls switching duty cycle |
| BAT (8) | Battery voltage sense | Direct connection to cell anode; internal 4.2V reference; 150mV recharge hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| No blocking diode required | Body terminal tied to GND (not source), eliminating reverse-battery conduction path |
| Automatic trickle charge | 35mA fixed current below 2.45V BAT; prevents deep-discharge damage |
| Battery temperature qualification | NTC/SHDN pin accepts 10kΩ thermistor; suspends charge outside 0°C–50°C range |
| End-of-charge C/10 detection | Monitors GATE duty cycle; asserts weak 40µA sink on CHRG pin without interrupting timer |
| Low quiescent drain in sleep mode | <1µA max battery current when VCC removed; extends shelf life of powered-off devices |
Applications
| Handheld Computers | Cellular Telephones |
|---|---|
Use Scenario: Charging Li-ion battery in ultra-thin tablet or PDA with limited PCB area and no thermal margin. IC Role / Device Role / Timing Role: Standalone CC/CV pulse charger managing full charge cycle from 2.45V trickle to 4.2V CV termination. Use Value: Integrated 0.35Ω NMOS eliminates external FET and blocking diode, reducing BOM count and board footprint by 3 components. | Use Scenario: Implementing safe, temperature-aware charging in GSM/UMTS handsets with NTC-based battery packs. IC Role / Device Role / Timing Role: Battery management unit providing overtemperature hold, C/10 detection, and auto-recharge at 150mV delta. Use Value: Dual-function NTC/SHDN pin enables both thermal qualification and hardware shutdown using one pin and two resistors. |
| Portable Medical Devices | Wearable Electronics |
Use Scenario: Powering Class II medical-grade portable monitors requiring fail-safe Li-ion charging with low sleep current. IC Role / Device Role / Timing Role: Safety-critical charger enforcing strict voltage accuracy (±1%), thermal cutoff (140°C), and defective-battery detection. Use Value: 1µA max sleep drain preserves battery charge during long standby intervals between clinical use sessions. | Use Scenario: Enabling compact, lightweight smartwatches with tight thermal constraints and minimal component height. IC Role / Device Role / Timing Role: Primary battery charger IC operating from USB 5V input with programmable 3-hour timer and ESR-tolerant CV phase. Use Value: Slew-rate controlled VCC ramping reduces inrush current into battery, preventing voltage droop that could reset host MCU. |
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 |
|---|---|---|---|
| LTC1731CS8#PBF | Controller-only (no internal MOSFET); requires external NMOS; supports CC/CV but no integrated switch | Suitable for higher-current designs (>1.5A) or where thermal separation of switch and controller is needed | Select when design requires >1A charge current or discrete power stage optimization |
| BQ24032ARHLR | TI part with integrated 1.5A switch, 4.2V float, but lacks NTC/SHDN pin; uses TS pin for thermal monitoring only | Requires external thermistor biasing circuit; no built-in cold/hot voltage thresholds or shutdown function | Select when NTC interface simplicity is secondary to higher integration density and lower cost |
Compared with LTC1730ES8-4.2, LTC1731CS8#PBF shifts thermal load externally and enables scalable current, while BQ24032ARHLR trades NTC/SHDN dual functionality for higher current rating and TI ecosystem support - neither offers identical pin-compatible replacement.
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-term lifecycle support, and guaranteed parametric compliance across –40°C to 85°C.
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 LTC portfolio.
The LTC1730 series belongs to Linear's precision battery management IC family, designed specifically for cost-sensitive, space-constrained portable Li-ion applications requiring high voltage accuracy, low quiescent current, and integrated safety features without external discrete components.
FAQ
What is the exact float voltage tolerance of the LTC1730ES8-4.2?
The LTC1730ES8-4.2 guarantees a 4.2V float voltage with ±1% accuracy (4.158V to 4.242V) over the full operating temperature range of –40°C to 85°C when VCC is between 5V and 12V. This specification is explicitly confirmed in the DC Electrical Characteristics table on page 2 of the official datasheet, under the VBAT parameter row for the LTC1730ES8-4.2 variant.
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 pass transistor has the body terminal connected to GND rather than the source, eliminating the intrinsic body diode path from BAT to VCC. This architecture prevents reverse battery current if VCC is shorted to ground - a key feature explicitly stated in the datasheet's DESCRIPTION and FEATURES sections.
How does the LTC1730ES8-4.2 detect end-of-charge?
The LTC1730ES8-4.2 detects end-of-charge using two complementary methods: (1) C/10 detection, where a comparator monitors GATE pin duty cycle and triggers when it falls below 10%, pulling CHRG to a 40µA sink state; and (2) programmable timer expiration. Both conditions must be satisfied for full termination, as detailed in the TYPICAL APPLICATIONS and OPERATION sections of the datasheet.
What is the maximum allowable charge current for the LTC1730ES8-4.2?
The maximum allowable charge current for the LTC1730ES8-4.2 is determined by the external sense resistor value: IMAX = 0.1V / RSENSE. With RSENSE = 0.1Ω, IMAX = 1A (typical), with min/max limits of 0.7A and 1.3A over temperature. This value is specified in the DC ELECTRICAL CHARACTERISTICS table (page 2) under IMAX for the LTC1730ES8-4.2 variant.
Can the LTC1730ES8-4.2 operate without a temperature sensor?
Yes, the LTC1730ES8-4.2 can operate without a temperature sensor. The NTC/SHDN pin defaults to normal operation when left unconnected or pulled to VCC/GND per application requirements. If unused, it may be tied to VCC to disable thermal hold - though this forfeits overtemperature protection. The datasheet confirms this flexibility in the PIN FUNCTIONS section for Pin 6.
LTC1730ES8-4.2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1730ES8-4.2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1730ES8-4.2#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 LTC1730ES8-4.2#PBF reliable?
The price and inventory of LTC1730ES8-4.2#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1730ES8-4.2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1730ES8-4.2#PBF transactions.
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Once your LTC1730ES8-4.2#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 LTC1730ES8-4.2#PBF?
For technical support, including LTC1730ES8-4.2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1730ES8-4.2#PBF requirements.
6.How does Aetrix verify that LTC1730ES8-4.2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1730ES8-4.2#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 LTC1730ES8-4.2#PBF meets industry standards.
7.What is the process for return or replacement of LTC1730ES8-4.2#PBF?
All LTC1730ES8-4.2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1730ES8-4.2#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 LTC1730ES8-4.2#PBF part is unused and in its original packaging.
Return procedure for LTC1730ES8-4.2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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