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Analog Devices Inc. LTC4011CFE#TRPBF
- Part No.:
- LTC4011CFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC4011CFE#TRPBF.pdf
- Description:
- IC BATT CHG MULTI 1-16C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,082
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Product details
Overview
LTC4011CFE#TRPBF from Analog Devices (formerly Linear Technology) is a standalone synchronous PWM nickel battery charger IC for 1–16-cell NiMH/NiCd packs. It integrates a 550kHz current-source controller, –∆V/∆T/∆t termination, PowerPath™ control, and programmable 5% accurate charge current. It enables high-efficiency, low-noise charging in portable diagnostics and backup battery systems without microcontroller firmware.
For engineers reviewing the LTC4011CFE#TRPBF datasheet, LTC4011CFE#TRPBF pinout, LTC4011CFE#TRPBF application, or LTC4011CFE#TRPBF equivalent, key selection considerations include its dual-chemistry pin-selectable termination, integrated thermistor interface (VRT/VTEMP), 4.5V–34V input range, and 20-lead TSSOP thermal performance with exposed pad grounding.
Technical Context
The LTC4011CFE#TRPBF implements a synchronous buck topology with independent TGATE (PMOS) and BGATE (NMOS) drivers, enabling >90% efficiency at 2A output. Its PWM loop regulates SENSE-to-BAT voltage (95–105mV fast charge, 16–24mV precharge) via internal error amplifier and current-mode control with 460–640kHz switching frequency.
Charge state management is fully autonomous: it performs battery presence detection (VCELL ≥350mV), automatic trickle precharge, NiMH top-off (1/10×ICHG, tMAX/3), and automatic recharge (triggered at VCELL ≤1.325V). Termination uses simultaneous –∆V (6–25mV/cell) and ∆T/∆t (0.5–2.7°C/min) with chemistry selected via CHEM pin logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 34V - supports wide-range DC adapters and industrial power rails without external regulation |
| Switching Frequency | 460–640kHz (typ 550kHz) - enables compact ceramic-output filter design with no audible noise |
| Charge Current Accuracy | ±5% - achieved via precision internal reference and SENSE/BAT voltage regulation (95–105mV) |
| Termination Methods | –∆V (6–25mV/cell) + ∆T/∆t (0.5–2.7°C/min) - dual-algorithm, pin-selectable for NiMH/NiCd |
| Operating Temp Range | 0°C to 85°C - qualified for commercial portable and industrial embedded applications |
| Package | 20-Lead TSSOP with exposed thermal pad - θJA = 38°C/W; requires PCB soldering of pad for thermal compliance |
| Quiescent Current | 3–5mA (waiting), 5–9mA (fast charge), 5–10µA (shutdown) - enables long battery standby in backup systems |
Pinout & Package
20-Lead Plastic TSSOP (FE package) with exposed thermal pad (Pin 21 = GND). Requires soldering of exposed pad to PCB ground plane for specified thermal resistance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (1) | DC adapter presence sense | Detects external power insertion; triggers exit from micropower shutdown when >VCC |
| FAULT (2) | Open-drain fault indicator | Asserts low on battery overvoltage (≥2.085V/cell), temperature fault, or regulation failure |
| CHRG (3) | Open-drain charge status | Active low during precharge, fast charge, and top-off - drives LED directly |
| CHEM (4) | Chemistry select input | GND = NiMH (–∆V = 10mV/cell); ≥2.85V = NiCd (–∆V = 20mV/cell) |
| GND (5) | Analog ground reference | Single-point ground for internal references and ADC; separate from PGND but tied externally |
| VRT (6) | Thermistor bias supply | 3.3V regulated output driving NTC network between VRT–VTEMP–GND |
| VTEMP (7) | Temperature sensing input | Monitors thermistor divider; pauses charging if <200mV; disables temp control if >2.85V |
| VCELL (8) | Average cell voltage monitor | Inputs voltage divider from BAT–VCDIV; validates 0.35–1.95V/cell before/fast charge |
| VCDIV (9) | Cell divider ground switch | Open-drain GND switch enabling VCELL measurement; remains active in fault/auto-recharge |
| TIMER (10) | Charge timer programming | Resistor to GND sets max fast charge time (tMAX) with ±20% accuracy |
| SENSE (11) | Current sense input | Regulates voltage drop across external RSENSE; sets ICHG = 100mV/RSENSE |
| BAT (12) | Battery pack connection | Main battery return path; voltage used for VCC–BAT qualification (≥510mV) and cell monitoring |
| TOC (13) | NiMH top-off indicator | Active low only during NiMH top-off (1/10×ICHG, tMAX/3); inactive for NiCd |
| INTVDD (14) | Internal 5V regulator output | Supplies BGATE driver; bypass capacitor required; not for external load |
| BGATE (15) | Synchronous NMOS gate driver | Drives low-side FET; swing = 0–INTVDD; rise/fall <80ns into 1.6nF |
| PGND (16) | Power ground return | High-current return for switching node; must be low-impedance tie to GND |
| TGATE (17) | Synchronous PMOS gate driver | Drives high-side FET; clamped swing relative to VCC; rise/fall <100ns into 3nF |
| VCC (18) | Main power input | System rail supplied by DCIN (via PowerPath) or battery; powers all circuitry except BGATE |
| READY (19) | Charge qualification indicator | Active low when VCC ≥4.2V, VCC–BAT ≥510mV, VCELL 0.35–1.95V/cell, and temp valid |
| INFET (20) | PowerPath PMOS gate driver | Drives input pass FET; clamped ~6V below VCC; enables seamless system power switchover |
| Exposed Pad (21) | Thermal ground | Must be soldered to PCB ground plane; sole path for thermal dissipation (θJA = 38°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous NiMH/NiCd Charging | Eliminates need for MCU, firmware, or host processor - full cycle (precharge → fast → top-off → auto-recharge) managed internally |
| PowerPath™ Control Support | Enables uninterrupted system operation during battery insertion/removal or AC adapter disconnect via INFET-driven PMOS pass device |
| Ceramic-Capacitor Compatible | 550kHz PWM frequency avoids audible noise - no electrolytic capacitors needed for input/output filtering |
| Integrated Thermistor Interface | VRT (3.3V) + VTEMP inputs support standard 10kΩ NTC networks for precise ∆T/∆t termination and pause control |
| Micropower Shutdown | 5–10µA quiescent current extends battery life in always-connected backup systems during idle periods |
| Robust Fault Protection | Detects and latches on battery overvoltage (≥2.085V/cell), under-voltage (<350mV/cell), thermal excursion (>60°C), and PWM regulation loss |
Applications
| Portable Medical Diagnostics | Industrial Backup Battery Systems |
|---|---|
Use Scenario: Handheld blood glucose meters and portable ECG monitors requiring reliable, maintenance-free NiMH battery charging. IC Role / Device Role / Timing Role: Standalone charger managing full NiMH cycle with automatic top-off and temperature-qualified termination. Use Value: Enables 10+ year field deployment without firmware updates or calibration; eliminates audible coil whine in clinical environments. | Use Scenario: PLC I/O modules and remote RTUs using NiCd/NiMH as failover power during AC mains interruption. IC Role / Device Role / Timing Role: Dual-chemistry charger with PowerPath ensuring continuous 24/7 system uptime during battery swap or AC loss. Use Value: Prevents brownout resets during hot-swap; automatic recharge compensates for NiCd self-discharge in unattended installations. |
| Test & Measurement Instruments | Consumer Portable Audio |
Use Scenario: Benchtop multimeters and oscilloscope accessories powered by multi-cell NiMH packs. IC Role / Device Role / Timing Role: High-accuracy (±5%) current source charger with programmable timer and multiple status outputs for UI feedback. Use Value: Ensures consistent runtime across cells; CHRG/FAULT/READY/TOC pins drive intuitive LED indicators without GPIO overhead. | Use Scenario: Wireless headphones and portable Bluetooth speakers using compact NiMH battery packs. IC Role / Device Role / Timing Role: Low-noise, ceramic-capacitor-based charger supporting rapid 1C charging with automatic trickle and top-off. Use Value: Eliminates piezoelectric squeal during charging; micropower shutdown extends shelf life for retail inventory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nickel battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2002GN | Fixed 1–4 cell NiCd/NiMH support; no ∆T/∆t termination; 300kHz switching; no PowerPath | Limited to low-cell-count consumer devices; lacks thermal termination and system power continuity | Select when cost sensitivity outweighs multi-cell flexibility and thermal safety requirements |
| MAX1757EAP+ | Supports 1–16 cells; includes thermistor interface; but uses external op-amp for current sense and lacks integrated PowerPath | Requires additional external components for gate drive and system power management | Choose when legacy MAXIM design ecosystem exists and discrete gate driver layout is acceptable |
Compared with BQ2002GN and MAX1757EAP+, the LTC4011CFE#TRPBF uniquely integrates PowerPath control, dual-chemistry ∆T/∆t termination, and a complete synchronous gate driver pair - reducing BOM count by ≥4 components and eliminating risk of thermal runaway in high-reliability portable instruments.
Availability
LTC4011CFE#TRPBF is available at Aetrix Electronics and suitable for portable medical diagnostics, industrial backup battery systems, and test & measurement instruments requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant packaging.
Supply support for LTC4011CFE#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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, and automotive markets.
The LTC4011CFE#TRPBF belongs to ADI's Linear Technology battery management product line, designed specifically for autonomous, high-efficiency nickel-based charging in space-constrained portable and industrial equipment where firmware-free operation and thermal safety are critical.
FAQ
What battery chemistries does the LTC4011CFE#TRPBF support?
The LTC4011CFE#TRPBF supports both NiMH and NiCd batteries. Chemistry selection is made via the CHEM pin: connect to GND for NiMH (–∆V = 10mV/cell, ∆T/∆t = 1°C/min), or apply ≥2.85V for NiCd (–∆V = 20mV/cell, ∆T/∆t = 2°C/min). The LTC4011CFE#TRPBF does not support Li-ion, LiPo, or lead-acid chemistries.
Does the LTC4011CFE#TRPBF require an external microcontroller to operate?
No, the LTC4011CFE#TRPBF is a fully autonomous charger IC. It executes the entire NiMH/NiCd charge cycle-including precharge, fast charge, top-off, automatic recharge, and fault handling-without any firmware or host processor. All timing, termination, and state transitions are managed internally by analog and digital control logic within the LTC4011CFE#TRPBF.
How is charge current programmed on the LTC4011CFE#TRPBF?
Charge current is set by an external sense resistor (RSENSE) between SENSE (Pin 11) and BAT (Pin 12). The LTC4011CFE#TRPBF regulates the voltage across RSENSE to 100mV during fast charge, so ICHG = 0.1V / RSENSE. For example, a 50mΩ resistor yields 2A charge current. Accuracy is ±5% over temperature and line conditions.
What is the purpose of the exposed thermal pad (Pin 21) on the LTC4011CFE#TRPBF?
The exposed thermal pad (Pin 21) on the LTC4011CFE#TRPBF is electrically and thermally connected to GND. It must be soldered to a large PCB copper area to achieve the specified thermal resistance (θJA = 38°C/W). Failure to solder this pad will cause excessive junction temperature rise and potential thermal shutdown or reliability degradation of the LTC4011CFE#TRPBF.
Can the LTC4011CFE#TRPBF manage battery insertion and removal while the system is powered?
Yes, the LTC4011CFE#TRPBF continuously monitors VCELL to detect battery insertion or removal. When VCELL drops below 350mV, it recognizes battery absence and enters shutdown. Upon reinsertion, it initiates a full new charge cycle starting with qualification. Combined with PowerPath™ via INFET, this enables hot-swap capability without interrupting system power - a core function of the LTC4011CFE#TRPBF in portable instrumentation.
LTC4011CFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 16
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 34V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC4011CFE#TRPBF FAQ
1.How can I place an order for LTC4011CFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4011CFE#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 LTC4011CFE#TRPBF reliable?
The price and inventory of LTC4011CFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4011CFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4011CFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4011CFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4011CFE#TRPBF?
LTC4011CFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4011CFE#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 LTC4011CFE#TRPBF?
For technical support, including LTC4011CFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4011CFE#TRPBF requirements.
6.How does Aetrix verify that LTC4011CFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4011CFE#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 LTC4011CFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4011CFE#TRPBF?
All LTC4011CFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4011CFE#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 LTC4011CFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC4011CFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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