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Analog Devices Inc. LT1512IGN#PBF
- Part No.:
- LT1512IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1512IGN#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CEL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
LT1512IGN#PBF from Analog Devices (formerly Linear Technology) is a 500kHz current-mode switching regulator IC optimized for constant-current/constant-voltage battery charging in SEPIC topology. It integrates dual feedback paths (voltage via FB pin, current via IFB pin), supports input voltages from 2.4V to 30V, delivers up to 1A charging current for single Li-ion cells, and features 1% voltage accuracy and ground-referred current sensing. It is used in portable medical devices requiring isolated, programmable battery charging with input voltage flexibility.
For engineers reviewing the LT1512IGN#PBF datasheet, LT1512IGN#PBF pinout, LT1512IGN#PBF application, or LT1512IGN#PBF equivalent, key selection considerations include its 8-lead SOIC package, –40°C to 85°C industrial temperature grade, 1.245V internal reference, 100mV current sense threshold, and dual-function S/S pin supporting both shutdown and 600–800kHz synchronization.
Technical Context
The LT1512IGN#PBF implements current-mode control with an internal 500kHz oscillator, adaptive anti-saturation logic for rapid switch turn-off, and a dual-input error amplifier that simultaneously regulates output voltage (via 1.245V bandgap reference at FB) and charging current (via –100mV servoed IFB node). Its architecture enables stable operation across input voltages below, equal to, or above battery voltage.
It uses separate ground pins (GND for switch return, GND S for control circuitry) to isolate high-di/dt switch currents from sensitive analog feedback paths. The VC pin serves as both compensation node and soft-start/current-limit control point, with peak switch current scaling linearly from 0A to 1.8A as VC rises from 1.0V to 1.9V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz typical; minimizes external inductor size in SEPIC charger designs. |
| Voltage Reference (FB) | 1.245V ±12mV; enables precise 4.1V or 4.2V Li-ion float voltage setting with <1% tolerance. |
| Current Sense Threshold (IFB) | –100mV ±7mV; sets charging current as ICHRG = 100mV / RSENSE, enabling accurate CC mode. |
| Max Switch Current | 1.5A typical; supports up to 1A continuous battery charge current with margin for transient peaks. |
| Input Voltage Range | 2.4V to 30V; allows operation from single-cell Li-ion (3.0V min) up to 24V wall adapters. |
| Output Switch VBR | 40V minimum; ensures safe operation in SEPIC topologies where VSW = VIN + VBAT. |
| Supply Current (IQ) | 4mA to 5.5mA; low quiescent draw supports efficient light-load operation in battery-powered systems. |
Pinout & Package
LT1512IGN#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad thermal enhancement, rated for –40°C to 85°C ambient operation. Pin spacing is 1.27mm, body width 3.9mm, and total height 1.75mm - compatible with standard SOIC-8 reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier output / compensation node | Controls peak switch current (0–1.8A); used for loop compensation, soft-start, and current limiting. |
| FB | Voltage feedback input | Inverting input of voltage error amp; referenced to 1.245V internal bandgap; sets constant-voltage threshold. |
| IFB | Current feedback input | Servoed to –100mV during CC mode; senses battery charge current via external resistor. |
| S/S | Shutdown/synchronization input | Logic-compatible pin: low = micropower shutdown (12µA); 600–800kHz AC = frequency sync. |
| VSW | Internal switch collector | Carries up to 1.5A pulsed current; requires short, low-inductance PCB routing to minimize EMI. |
| GND | Power ground | Return path for switch current; must be tied directly to ground plane near IC. |
| GND S | Signal ground | Return for FB, IFB, VC, and S/S; isolated from GND to prevent noise coupling into feedback paths. |
| VIN | Input supply | Accepts 2.4–30V; requires local low-ESR capacitor connected directly between VIN and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-referred current sensing | Enables direct battery grounding and eliminates floating sense circuitry, simplifying system-level safety and isolation. |
| SEPIC topology optimization | Supports charging when input voltage is lower than battery voltage (e.g., 5V USB to 8.4V 2S Li-ion), unlike buck-only chargers. |
| Dual independent feedback loops | Simultaneous regulation of voltage (FB) and current (IFB) ensures seamless transition between CC and CV phases without external controllers. |
| Programmable charging current | Charging current can be dynamically adjusted via PWM-driven negative bias on IFB, enabling host MCU-based charge profile control. |
| Industrial temperature grade | Rated for –40°C to 85°C ambient operation, validated across full junction range (–40°C to 125°C), suitable for automotive accessory and industrial handheld applications. |
Applications
| Portable Medical Monitors | Industrial Handheld Scanners |
|---|---|
Use Scenario: Rechargeable Li-ion battery pack in a Class II medical-grade pulse oximeter operating from 5V USB or 12V DC input. IC Role / Device Role / Timing Role: Constant-current/constant-voltage battery charger IC managing full-charge cycle with precision voltage termination and thermal foldback. Use Value: Enables reliable, certified charging under variable input conditions (USB vs. adapter), with ground-referenced current sensing eliminating risk of battery terminal floating. | Use Scenario: Barcode scanner with hot-swappable 7.4V 2S Li-ion battery, powered from 9–30V vehicle supply. IC Role / Device Role / Timing Role: SEPIC-based battery charger IC providing regulated 8.4V CV/1A CC output regardless of input voltage fluctuations. Use Value: Allows uninterrupted operation during battery swap and maintains charge even when vehicle voltage dips below battery voltage (e.g., engine cranking). |
| Emergency Communication Radios | Field-Deployable Test Equipment |
Use Scenario: Ruggedized PTT radio using 3.7V Li-ion cell, charged from 12V vehicle port or solar panel with wide input variation. IC Role / Device Role / Timing Role: Primary battery management IC executing CC/CV charge algorithm with programmable current and automatic termination. Use Value: Delivers 1% voltage accuracy critical for Li-ion longevity, while 500kHz switching enables compact magnetics in space-constrained enclosures. | Use Scenario: Portable oscilloscope with integrated 14.8V 4S Li-ion pack, charged from universal 15–24V lab supply. IC Role / Device Role / Timing Role: High-efficiency SEPIC charger IC regulating 16.8V CV/0.8A CC output with minimal heat rise in sealed housing. Use Value: Dual ground pins (GND/GND S) suppress noise coupling into analog front-end circuits, preserving measurement integrity during charging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current/constant-voltage battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | External MOSFET controller (no integrated switch); supports higher power (up to 3A), wider VIN (4.5–36V), and multi-cell configurations. | Requires external N-channel MOSFET and gate driver; suited for >2A or >4-cell Li-ion systems where thermal management justifies added complexity. | Select LTC4000-1 only when scalable, high-power charging with flexible topology (buck, boost, SEPIC, flyback) is required - not for drop-in replacement. |
| MAX1771 | Older 300kHz current-mode controller; no integrated IFB current feedback path; requires external op-amp for CC loop; 1.25V reference tolerance ±2%. | Lacks native ground-referenced current sensing; needs additional components for accurate CC regulation; limited to commercial temp range (0°C to 70°C). | Choose MAX1771 only for legacy cost-sensitive designs where 1% voltage accuracy and industrial temp rating are not mandatory. |
Compared with LT1512IGN#PBF, LTC4000-1 offers greater scalability but adds BOM and layout complexity, while MAX1771 lacks integrated current feedback and industrial-grade specs - making LT1512IGN#PBF the optimal balance of integration, precision, and ruggedness for 1A-class SEPIC chargers.
Availability
LT1512IGN#PBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, emergency communication radios, and field-deployable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1512IGN#PBF 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 all Linear ICs including the LT1512 series.
The LT1512IGN#PBF belongs to Linear's legacy battery management IC portfolio, designed specifically for high-accuracy, topology-flexible battery charging in space- and thermal-constrained portable electronics.
FAQ
What is the maximum battery voltage supported by the LT1512IGN#PBF in SEPIC configuration?
The LT1512IGN#PBF supports battery voltages up to 30V in SEPIC topology, constrained by its 40V switch breakdown voltage and maximum input voltage of 30V. For example, with a 24V input, the maximum battery voltage is 16V (since VSW = VIN + VBAT ≤ 40V). The LT1512IGN#PBF datasheet confirms this limit in the Absolute Maximum Ratings and Applications Information sections.
Can the LT1512IGN#PBF charge multiple lithium-ion cells in series?
Yes, the LT1512IGN#PBF can charge up to 30V total battery stack voltage - supporting configurations such as 2S (8.4V), 3S (12.6V), or 4S (16.8V) Li-ion packs. Its constant-voltage accuracy of 1% ensures proper per-cell voltage regulation when used with appropriate resistor dividers on the FB pin. This capability is explicitly stated in the Features section of the LT1512IGN#PBF datasheet.
Does the LT1512IGN#PBF require external components for current sensing, and what is the recommended sense resistor value?
Yes, the LT1512IGN#PBF requires an external current sense resistor (R3 in Figure 1) connected between battery negative and ground. With a fixed –100mV IFB threshold, charging current is calculated as ICHRG = 100mV / R3. For 1A charging, R3 = 0.1Ω; for 0.5A, R3 = 0.2Ω. The LT1512IGN#PBF datasheet specifies R3 = 0.2Ω in the typical application schematic and notes that filter resistor R4 must be <50Ω due to IFB's 5kΩ input impedance.
How does the S/S pin function in synchronization mode, and what is the required signal format?
In synchronization mode, the S/S pin accepts a 600–800kHz square wave or sine wave with ≥0.5VP-P amplitude. The LT1512IGN#PBF locks its internal 500kHz oscillator to the external frequency without entering shutdown. The datasheet specifies that synchronization avoids shutdown via an internal timer, and minimum peak-to-peak sync voltage varies with temperature (e.g., ~1.0V at 25°C). This behavior is confirmed in the Electrical Characteristics table and Pin Functions description for LT1512IGN#PBF.
Is the LT1512IGN#PBF RoHS-compliant and lead-free?
Yes, the LT1512IGN#PBF is RoHS-compliant and features a lead-free finish, as indicated by the "#PBF" suffix in the part number and confirmed in Linear Technology's official lead-free marking documentation. The device meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for standard Pb-free reflow profiles. This compliance is documented in the Order Information section of the LT1512IGN#PBF datasheet.
LT1512IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1512IGN#PBF FAQ
1.How can I place an order for LT1512IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1512IGN#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 LT1512IGN#PBF reliable?
The price and inventory of LT1512IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1512IGN#PBF is usually 5 days.
3.What payment methods are accepted for LT1512IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1512IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1512IGN#PBF?
LT1512IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1512IGN#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 LT1512IGN#PBF?
For technical support, including LT1512IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1512IGN#PBF requirements.
6.How does Aetrix verify that LT1512IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1512IGN#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 LT1512IGN#PBF meets industry standards.
7.What is the process for return or replacement of LT1512IGN#PBF?
All LT1512IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1512IGN#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 LT1512IGN#PBF part is unused and in its original packaging.
Return procedure for LT1512IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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