My Inquiry
My Account
Analog Devices Inc. LT1512CGN#TRPBF
- Part No.:
- LT1512CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1512CGN#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CEL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,970
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1512CGN#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz current-mode switching regulator IC optimized for constant-current/constant-voltage battery charging in SEPIC or flyback topologies. It features ground-referenced current sensing, 1.5A maximum switch current, ±100mV current sense threshold, and 1.245V voltage reference with 1% accuracy - enabling precise single-cell Li-ion charging at up to 1A. It operates with input voltages as low as 2.4V and supports charging when VIN < VBAT.
For engineers reviewing the LT1512CGN#TRPBF datasheet, LT1512CGN#TRPBF pinout, LT1512CGN#TRPBF application, or LT1512CGN#TRPBF equivalent, key selection considerations include its dual feedback architecture (FB + IFB), thermal-limited 1.5A switch current, 8-lead GN package with separate GND/GND S pins, and compatibility with programmable charge current via PWM modulation of the IFB loop.
Technical Context
The LT1512CGN#TRPBF implements current-mode control with independent voltage and current error amplifiers sharing a common VC output node. Its block diagram integrates a 500kHz oscillator, anti-saturation logic driver, 2.3V internal LDO, and dual inverting inputs: FB for 1.245V-referenced voltage regulation and IFB for –100mV-referenced current regulation.
It supports synchronous operation via the S/S pin (600–800kHz range) and shutdown with 12µA quiescent current. The IC enforces duty cycle limits (max 95%), uses external RC compensation on VC, and requires physically separated GND and GND S planes to isolate high di/dt switch return paths from sensitive analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz typical; minimizes inductor size and enables compact SEPIC designs with 33µH windings. |
| Voltage Reference (FB) | 1.245V ±1%; ensures ≤±41mV float voltage error for 4.2V Li-ion cells at full charge. |
| Current Sense Threshold (IFB) | –100mV ±7mV; sets charging current as ICHRG = 0.1V / RSENSE, e.g., 0.5A with 0.2Ω. |
| Max Switch Current | 1.5A at TJ ≤ 125°C; supports ≤1A battery charge current in single Li-ion configurations. |
| Input Voltage Range | 2.4V to 30V; allows operation below battery voltage (e.g., 5V input charging 8.2V dual Li-ion). |
| Supply Current (IQ) | 4–5.5mA active; enables low-power system integration without excessive bias load. |
| Shutdown Current | 12µA max; reduces standby drain during battery maintenance or host sleep modes. |
Pinout & Package
The LT1512CGN#TRPBF is housed in an 8-lead GN (Gull Wing) surface-mount package - a thermally enhanced variant of the SO-8 footprint with fused leads and lower θJA than standard SO-8. It features separate GND (power switch return) and GND S (control circuit ground) pins to prevent noise coupling into FB/IFB sensing paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier output / compensation node | Drives current comparator; voltage (1.0–1.9V) sets peak switch current; requires RC-to-GND S for stability. |
| FB | Voltage feedback input | Inverting input to voltage EA; referenced to 1.245V internal bandgap; defines battery float voltage via R1/R2 divider. |
| IFB | Current feedback input | Inverting input to current EA; regulated at –100mV during CC mode; senses battery current via ground-referenced RSENSE. |
| S/S | Shutdown/synchronization input | Logic-compatible pin: low = shutdown (12µA IQ); 600–800kHz square wave = frequency sync; open = enabled. |
| VSW | Internal switch collector | Carries up to 1.5A pulsed current; requires short, low-inductance PCB trace to minimize EMI and voltage spikes. |
| GND | Power ground | Return path for switch current; must connect directly to power ground plane, separate from GND S. |
| GND S | Signal ground | Return for FB, IFB, VC, and internal analog circuitry; isolates control loop from switch noise. |
| VIN | Input supply | Accepts 2.4–30V; powers internal 2.3V LDO and driver; requires local low-ESR capacitor to GND S. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent feedback loops | Separate FB (voltage) and IFB (current) inputs enable true CC/CV battery charging without external op-amps or muxing. |
| Ground-referenced current sensing | IFB regulates at –100mV relative to GND S, eliminating high-side sensing complexity and enabling direct battery grounding. |
| SEPIC topology optimization | Supports VIN < VBAT, VIN = VBAT, or VIN > VBAT operation; no battery discharge path when disabled. |
| Programmable charge current | IFB loop accepts externally injected current (e.g., via PWM peak detector) to dynamically scale charge current without resistor changes. |
| Thermally robust GN package | Fused-lead 8-lead GN offers lower θJA than SO-8; designed for higher power dissipation in battery charger PCB layouts. |
Applications
| Lithium-Ion Battery Charger | NiMH/NiCd Fast Charger |
|---|---|
Use Scenario: Charging single or dual Li-ion cells from wall adapters, USB PD sources, or automotive 12V systems where input may dip below battery voltage. IC Role / Device Role / Timing Role: Constant-current/constant-voltage controller managing SEPIC power stage; regulates both battery voltage (via FB) and charge current (via IFB) with 1% voltage accuracy. Use Value: Enables safe, high-efficiency charging across wide input ranges (2.4–30V), including buck-boost scenarios where VIN < VBAT - critical for portable medical devices and ruggedized IoT sensors. | Use Scenario: High-rate charging of NiMH packs in cordless power tools or emergency lighting, requiring precise current limiting and temperature-compensated termination. IC Role / Device Role / Timing Role: Precision current-limited power supply with programmable CC setpoint; uses IFB feedback to maintain fixed current until voltage threshold (set by FB divider) is reached. Use Value: Delivers repeatable 1C–2C charge profiles with minimal external components; eliminates need for discrete current mirrors or DAC-controlled references. |
| Lead-Acid Maintenance Charger | Transducer Excitation Supply |
Use Scenario: Low-maintenance float charging for 6V/12V sealed lead-acid batteries in security panels, UPS hold-up, or telecom backup systems. IC Role / Device Role / Timing Role: Constant-voltage regulator with adjustable current limit; FB sets 13.8V/27.6V float voltage; IFB limits surge current during bulk phase. Use Value: Prevents overcharge while supporting high initial current (up to 1A) for rapid recovery; built-in thermal derating protects against ambient temperature drift. | Use Scenario: Stable, low-noise excitation for precision resistive bridge sensors (e.g., strain gauges, RTDs) in industrial instrumentation requiring matched current sourcing. IC Role / Device Role / Timing Role: Precision current source using IFB feedback loop; converts external voltage reference into regulated current via RSENSE. Use Value: Achieves <0.1% current matching between channels when paired with matched resistors; ground-referenced sensing simplifies 4-wire Kelvin connections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | Multi-chemistry controller with integrated MOSFET drivers; supports N+P channel FETs; no internal switch; requires external power stage. | Designed for high-power (>2A) or multi-cell Li-ion packs; supports JEITA temperature profiling and SMBus telemetry. | Select LTC4000-1 when scaling beyond 1A or requiring digital interface, thermal foldback, or support for >30V battery stacks. |
| MAX1771 | 500kHz current-mode controller with internal 1.5A switch; no dedicated IFB pin; uses single FB loop with current-sense resistor in high-side path. | Lacks ground-referenced current sensing; requires high-side sensing and level-shifting for battery-grounded configurations. | Select MAX1771 only for cost-sensitive, non-battery-grounded SEPIC designs where layout constraints permit high-side sensing. |
Compared with LTC4000-1 and MAX1771, the LT1512CGN#TRPBF uniquely combines an integrated 1.5A switch, dual ground-referenced feedback (FB + IFB), and SEPIC-optimized architecture - making it optimal for compact, battery-grounded, sub-1A Li-ion/NiMH chargers where board space and analog simplicity are prioritized over digital control or scalability.
Availability
LT1512CGN#TRPBF is available at Aetrix Electronics and suitable for battery-powered medical monitors, industrial handhelds, portable test equipment, and embedded energy storage systems requiring stable component supply and long-term manufacturability.
Supply support for LT1512CGN#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1512CGN#TRPBF belongs to Linear's legacy battery charger IC product line, specifically engineered for high-accuracy, topology-flexible charging of rechargeable chemistries - emphasizing analog precision, thermal robustness, and minimal external component count in space-constrained applications.
FAQ
What is the maximum battery voltage supported by the LT1512CGN#TRPBF?
The LT1512CGN#TRPBF does not impose a direct battery voltage limit, but the SEPIC topology constrains maximum VBAT by the switch voltage rating: VSW ≤ 40V. Since VSW = VIN + VBAT in SEPIC, the practical upper bound is VBAT ≤ 40V – VIN. For example, with VIN = 12V, VBAT must be ≤ 28V - sufficient for up to 7-series Li-ion (29.4V) or 24V lead-acid systems. Always verify worst-case VSW stress under minimum VIN conditions.
Can the LT1512CGN#TRPBF charge batteries with input voltage lower than battery voltage?
Yes - this is a core capability enabled by the SEPIC topology. The LT1512CGN#TRPBF supports VIN < VBAT (e.g., 5V input charging an 8.2V dual Li-ion pack), VIN = VBAT, and VIN > VBAT. Unlike buck-only chargers, it maintains regulation across all three conditions without topology change or external circuitry, making it ideal for universal-input portable chargers.
How is charging current programmed on the LT1512CGN#TRPBF?
Charging current is set by the value of the ground-referenced sense resistor (RSENSE) on the IFB pin: ICHRG = 0.1V / RSENSE. For example, RSENSE = 0.2Ω yields 0.5A. The LT1512CGN#TRPBF also supports dynamic programming via external current injection into IFB (e.g., using a PWM-driven peak detector), allowing real-time adjustment from ~20% to 100% of full-scale current without hardware changes.
Why does the LT1512CGN#TRPBF have separate GND and GND S pins?
The LT1512CGN#TRPBF separates GND (high-current switch return) and GND S (low-noise analog reference ground) to prevent fast-switching di/dt transients from corrupting the precision FB and IFB feedback signals. Routing high-current paths directly to GND while connecting all resistive dividers, compensation networks, and bypass capacitors to GND S ensures stable CC/CV regulation and avoids oscillation or voltage error due to ground bounce.
Is the LT1512CGN#TRPBF RoHS-compliant and lead-free?
Yes - the "#TRPBF" suffix in LT1512CGN#TRPBF explicitly denotes lead-free (Pb-free) finish and tape-and-reel packaging per RoHS Directive 2011/65/EU. The device uses matte tin plating on gull-wing leads and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements. Full compliance documentation is available from Analog Devices' product page for LT1512CGN#TRPBF.
LT1512CGN#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:
- Multi-Chemistry
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 1A
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 25V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1512CGN#TRPBF FAQ
1.How can I place an order for LT1512CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1512CGN#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 LT1512CGN#TRPBF reliable?
The price and inventory of LT1512CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1512CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1512CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1512CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1512CGN#TRPBF?
LT1512CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1512CGN#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 LT1512CGN#TRPBF?
For technical support, including LT1512CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1512CGN#TRPBF requirements.
6.How does Aetrix verify that LT1512CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1512CGN#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 LT1512CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1512CGN#TRPBF?
All LT1512CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1512CGN#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 LT1512CGN#TRPBF part is unused and in its original packaging.
Return procedure for LT1512CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1512CGN#TRPBF Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
