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Analog Devices Inc. LTC1734ES6-4.1#TRMPBF
- Part No.:
- LTC1734ES6-4.1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1734ES6-4.1#TRMPBF.pdf
- Description:
- IC BAT CHG MULTCHEM 1CL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LTC1734ES6-4.1#TRMPBF from Analog Devices (formerly Linear Technology) is a single-cell Li-ion linear battery charger controller in TSOT-23-6 package, delivering 1% accurate 4.1V float voltage, programmable 200–700mA constant-current charging via external resistor, and PROG-pin-based current monitoring for microcontroller-driven charge termination - deployed in compact handheld devices requiring low-profile, low-cost charging.
For engineers reviewing the LTC1734ES6-4.1#TRMPBF datasheet, LTC1734ES6-4.1#TRMPBF pinout, LTC1734ES6-4.1#TRMPBF application, or LTC1734ES6-4.1#TRMPBF equivalent, this page provides verified functional identity, validated TSOT-23-6 pin mapping, confirmed 4.1V/1% float accuracy, real-world charge current monitor behavior (VPROG = IBAT/1000 × RPROG), and two field-validated alternative parts with documented technical and application differences.
Technical Context
The LTC1734ES6-4.1#TRMPBF implements dual-loop control: a precision 2.5V reference and internal resistor divider set the 4.1V float voltage (±1%), while amplifier A2 enforces constant current by regulating DRIVE pin sink current to maintain 1.5V across RPROG, yielding IBAT = 1000 × (1.5V / RPROG). It operates only with an external PNP pass transistor - no internal power switch - and uses ISENSE as emitter current sense node.
Manual shutdown is triggered when PROG pin voltage exceeds 2.15V (hysteresis = 90mV), achieved by floating RPROG to activate a 3µA internal pull-up; sleep mode engages automatically when VCC = 0V, limiting battery drain to ±1µA. Undervoltage lockout activates below 4.41V (entry) and releases above 4.56V (exit), with 150mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V ±1% - precisely regulates single-cell Li-ion battery terminal voltage during CV phase; enables safe full-charge without overvoltage risk. |
| Charge Current Range | 200mA to 700mA - set by single external RPROG (7.5kΩ to 2.143kΩ); supports scalable charging for varying battery capacities. |
| PROG Pin Monitor Gain | 1000:1 - VPROG = (IBAT / 1000) × RPROG; allows direct ADC reading of real-time charge current without additional sensing components. |
| Battery Drain in Shutdown | ±1µA - negligible self-discharge during manual shutdown or sleep mode; preserves battery standby time over weeks/months. |
| UVLO Threshold | 4.41V (entry) / 4.56V (exit) - prevents erratic startup at marginal input voltages; 150mV hysteresis avoids oscillation near threshold. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and portable consumer environments; junction limit 100°C ensures reliability under sustained load. |
| Package | TSOT-23-6 - 1mm profile, 2.9mm × 1.6mm footprint; enables ultra-thin designs where height and PCB area are constrained. |
Pinout & Package
TSOT-23-6 package: 6-lead plastic thin small-outline transistor, 1mm maximum height, 0.95mm pitch, exposed pad not present. RoHS-compliant, lead-free finish (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISENSE (1) | Emiter current sense node | Connects to PNP emitter; carries total emitter current (IBAT + IBASE); internal 0.06Ω sense resistor develops voltage for current regulation loop. |
| GND (2) | Analog/digital ground reference | Return path for all internal circuits and voltage references; must be connected near battery ground to avoid float voltage error from IR drop. |
| VCC (3) | Positive supply input | Supplies control circuitry and drives PNP base via DRIVE pin; requires 4.55–8V input; bypass with 1–10µF capacitor to GND. |
| PROG (4) | Current programming & monitor | 1.5V virtual ground for RPROG; outputs VPROG proportional to IBAT; floating triggers 2.15V shutdown; max capacitive load 10pF for stability. |
| BAT (5) | Battery voltage sense input | Internal 34µA bias current feeds precision divider; sets 4.1V float point; disconnects in shutdown/sleep; requires ≥5µF bypass for stability. |
| DRIVE (6) | PNP base drive output | Sink driver for PNP base; current-limited to 30mA typical; thermally protected; no external blocking diode needed. |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor required | Internal 0.06Ω current sense element eliminates discrete shunt, reducing BOM count and board space in cost-sensitive chargers. |
| Programmable charge current via single resistor | RPROG directly sets full-scale IBAT (200–700mA); simplifies design iteration and enables factory calibration without firmware changes. |
| Real-time charge current monitoring | VPROG provides analog readout of instantaneous IBAT (1mV ≈ 0.67mA @ 7.5kΩ); enables precise microcontroller-based charge termination. |
| Zero-drain shutdown & sleep modes | IBMS/IBSL ≤ ±1µA ensures battery remains charged for months when disconnected from input or manually disabled. |
| Integrated UVLO with hysteresis | Prevents unstable operation during brown-out; 150mV hysteresis eliminates chatter near 4.5V input threshold. |
Applications
| Smartphone Charging Circuit | Digital Camera Battery Management |
|---|---|
Use Scenario: Integrated linear charger in space-constrained smartphone mainboard, powered from USB 5V supply with thermal limits. IC Role / Device Role / Timing Role: Li-ion charger controller managing CC/CV charge profile; interfaces with system MCU via PROG pin for adaptive termination. Use Value: 4.1V float voltage matches legacy LiCoO₂ cell chemistry; TSOT-23-6 footprint saves >2mm² vs SOIC; ±1µA shutdown drain extends shelf life. | Use Scenario: Compact digital camera with removable Li-ion pack, requiring reliable charge control without external diodes or complex sequencing. IC Role / Device Role / Timing Role: Standalone linear charger IC enabling hot-plug battery insertion and automatic sleep on USB disconnect. Use Value: No blocking diode needed reduces forward drop and heat; 1% float accuracy prevents overcharge degradation; 1mm profile fits slim body design. |
| Handheld Medical Scanner | USB-Cradle for Industrial PDA |
Use Scenario: Portable medical scanner with long idle periods between clinical use, requiring minimal battery self-discharge during storage. IC Role / Device Role / Timing Role: Primary battery management IC handling charge initiation, current regulation, and MCU-monitored termination. Use Value: Sleep-mode battery drain ≤1µA preserves >95% charge after 6 months; –40°C to +85°C rating supports field deployment in variable climates. | Use Scenario: Docking cradle providing simultaneous charging and data sync for ruggedized PDAs used in warehouse logistics. IC Role / Device Role / Timing Role: Dedicated charger per docked unit; PROG pin monitored by dock MCU to detect end-of-charge and trigger status LED. Use Value: Programmable current (200–700mA) accommodates different battery capacities across PDA models; UVLO prevents false start during unstable dock power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion linear charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73831T-2DCI/OT | Fixed 4.2V float; integrated MOSFET; no external PNP required; 500mA max; SOT-23-5 package. | Eliminates external transistor but lacks PROG-based current monitoring; unsuitable for 4.1V chemistries or custom current scaling. | Select when board space is critical and 4.2V/500mA suffices; avoid if 4.1V float or analog current feedback is required. |
| BQ24040DRCR | 4.2V float; integrated P-channel MOSFET; thermal regulation; 800mA max; 10-pin WSON; includes STAT pin. | Higher integration but larger footprint; no analog PROG monitor - only digital charge status flags; no 4.1V variant available. | Choose for higher current or thermal foldback needs; reject if analog current telemetry or 4.1V compliance is mandatory. |
Compared with MCP73831T-2DCI/OT and BQ24040DRCR, the LTC1734ES6-4.1#TRMPBF uniquely supports 4.1V float voltage with 1% accuracy, delivers true analog current monitoring via PROG pin, and retains full flexibility with external PNP selection - making it the only option for legacy Li-ion cells requiring 4.1V termination and MCU-driven charge algorithms.
Availability
LTC1734ES6-4.1#TRMPBF is available at Aetrix Electronics and suitable for smartphone charging circuits, digital camera battery management, handheld medical scanners, USB-cradles for industrial PDAs, and programmable current source designs requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for LTC1734ES6-4.1#TRMPBF 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, datasheets, and application notes for the LTC portfolio. Linear pioneered high-performance analog ICs with emphasis on precision, efficiency, and robustness.
The LTC1734 belongs to Linear's battery management IC family, designed specifically for cost-sensitive, space-constrained portable electronics requiring accurate, low-quiescent linear charging without integrated power switches - targeting applications where external PNP optimization is preferred over monolithic solutions.
FAQ
What is the exact float voltage accuracy of the LTC1734ES6-4.1#TRMPBF?
The LTC1734ES6-4.1#TRMPBF guarantees ±1% accuracy on its 4.1V float voltage over the full –40°C to +85°C operating temperature range. Measured values fall between 4.059V and 4.141V at IBAT = 10mA with VCC between 4.55V and 8V, per the official Electrical Characteristics table. This tolerance ensures compatibility with Li-ion cells specified for 4.1V termination.
Does the LTC1734ES6-4.1#TRMPBF include an internal power switch?
No, the LTC1734ES6-4.1#TRMPBF does not contain an internal power switch. It is a controller-only IC requiring an external PNP pass transistor (e.g., FMMT549, FCX589) connected between VCC and BAT. The DRIVE pin sinks base current to regulate the PNP, and ISENSE senses emitter current - enabling thermal and current optimization beyond what monolithic chargers offer.
How is charge current programmed and monitored on the LTC1734ES6-4.1#TRMPBF?
Charge current is programmed by connecting a resistor (RPROG) between PROG and GND: IBAT = 1000 × (1.5V / RPROG). It is monitored via VPROG, which equals (IBAT / 1000) × RPROG - so a microcontroller ADC reading VPROG directly yields real-time charge current. For example, with RPROG = 7.5kΩ and VPROG = 0.75V, IBAT = 100mA.
What happens to battery drain current when the LTC1734ES6-4.1#TRMPBF is in shutdown or sleep mode?
In manual shutdown (PROG pin floated), battery drain current is bounded by ±1µA (IBMS). In sleep mode (VCC = 0V), drain is similarly limited to ±1µA (IBSL). These ultra-low leakage values are confirmed across –40°C to +85°C and enable multi-month battery retention without disconnection - critical for medical and backup-power applications.
Can the LTC1734ES6-4.1#TRMPBF charge NiMH or NiCd batteries?
Yes, the LTC1734ES6-4.1#TRMPBF can function as a general-purpose constant-current source for NiMH/NiCd charging by grounding the BAT pin to disable the voltage regulation loop. Only the PROG-resistor-set current remains active, allowing programmable 200–700mA output. External voltage-based or temperature-based termination must be implemented externally, as the IC provides no built-in NiMH/NiCd charge algorithm.
LTC1734ES6-4.1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- Over Current, Over Temperature
- Charge Current - Max:
- 700mA
- Battery Pack Voltage:
- 4.1V
- Voltage - Supply (Max):
- 8V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1734ES6-4.1#TRMPBF FAQ
1.How can I place an order for LTC1734ES6-4.1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1734ES6-4.1#TRMPBF 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 LTC1734ES6-4.1#TRMPBF reliable?
The price and inventory of LTC1734ES6-4.1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1734ES6-4.1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1734ES6-4.1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1734ES6-4.1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1734ES6-4.1#TRMPBF?
LTC1734ES6-4.1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1734ES6-4.1#TRMPBF 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 LTC1734ES6-4.1#TRMPBF?
For technical support, including LTC1734ES6-4.1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1734ES6-4.1#TRMPBF requirements.
6.How does Aetrix verify that LTC1734ES6-4.1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1734ES6-4.1#TRMPBF 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 LTC1734ES6-4.1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1734ES6-4.1#TRMPBF?
All LTC1734ES6-4.1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1734ES6-4.1#TRMPBF, 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 LTC1734ES6-4.1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1734ES6-4.1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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