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Analog Devices Inc. LT1512IN8#PBF
- Part No.:
- LT1512IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1512IN8#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 1CEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,954
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Product details
Overview
LT1512IN8#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 or flyback topologies. It delivers up to 1A charging current for single Li-ion cells, features ±1% voltage regulation accuracy, 1.5A internal switch current limit, and operates with input voltages as low as 2.4V - enabling charging when VIN < VBAT. It is used in portable medical devices, industrial handhelds, and backup power systems requiring reliable, ground-referred current sensing.
For engineers reviewing the LT1512IN8#PBF datasheet, LT1512IN8#PBF pinout, LT1512IN8#PBF application, or LT1512IN8#PBF equivalent, key selection considerations include its –40°C to +85°C industrial temperature grade, dual feedback architecture (FB for voltage, IFB for current), 100mV current-sense threshold, separate GND S / GND pins for noise isolation, and synchronization capability via the S/S pin.
Technical Context
The LT1512IN8#PBF implements current-mode control with dual inverting inputs: FB senses output voltage against a 1.245V internal reference, while IFB senses charging current via an external sense resistor, regulating to –100mV during constant-current mode. Its error amplifier drives the VC pin, which directly sets peak switch current (0–1.8A over 1–1.9V).
It integrates a 500kHz oscillator, anti-saturation logic for fast switch turn-off, a 2.3V low-dropout internal regulator, and a dual-function S/S pin supporting both shutdown (≤0.6V) and external synchronization (600–800kHz). The 8-lead PDIP package uses isolated GND S (control ground) and GND (switch ground) terminals to minimize noise coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz typical; minimizes inductor size and enables compact SEPIC charger designs. |
| Max Switch Current | 1.5A at 50% duty cycle; supports ≤1A Li-ion charging with margin for thermal derating. |
| Voltage Reference Accuracy | ±1% over temperature; ensures precise 4.2V float voltage for single-cell Li-ion without external trimming. |
| Current Sense Threshold | –100mV at IFB pin; enables high-efficiency, ground-referred current sensing with minimal power loss. |
| Operating Temp Range | –40°C to +85°C ambient; qualified for industrial environments including factory automation and outdoor equipment. |
| Input Voltage Range | 2.4V to 30V; allows operation below battery voltage (e.g., 5V input charging 8.2V dual Li-ion stack). |
| Supply Current | 4–5.5mA active; enables low-quiescent-power operation in always-on battery management systems. |
Pinout & Package
LT1512IN8#PBF is housed in an 8-lead narrow-body PDIP (N8) package with 0.300″ width, rated for –40°C to +85°C operation and featuring exposed copper pads for improved thermal conduction in through-hole PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Error amplifier output / compensation node | Drives current comparator; 1–1.9V range sets peak switch current; used for soft-start and loop compensation. |
| 2 - FB | Voltage feedback input | Inverting input of voltage error amp; referenced to 1.245V internal bandgap; sets battery float voltage via R1/R2 divider. |
| 3 - IFB | Current feedback input | Inverting input of current sense amplifier; regulates to –100mV during CC mode; 5kΩ input impedance requires low-R filter. |
| 4 - S/S | Shutdown / synchronization input | Logic-compatible pin: ≤0.6V = shutdown (12µA IQ); 600–800kHz AC signal = frequency sync; floating = enabled. |
| 5 - VSW | Internal switch collector | Carries up to 1.5A pulsed current; connects to SEPIC coupling capacitor and diode; requires short, low-inductance trace. |
| 6 - GND | Power ground (switch return) | Return path for high-di/dt switch current; must be tied directly to ground plane near IC, separate from GND S. |
| 7 - GND S | Signal ground (control circuitry) | Reference for FB, IFB, VC, and S/S; isolates sensitive analog circuitry from switch noise; connects to divider/filter components. |
| 8 - VIN | Input supply voltage | Accepts 2.4–30V; powers internal 2.3V LDO; requires local low-ESR bypass capacitor connected directly to GND S. |
Key Features
| Feature | Design Value |
|---|---|
| SEPIC topology support | Enables charging when input voltage is lower, equal to, or higher than battery voltage - no minimum VIN > VBAT constraint. |
| Ground-referred current sensing | IFB pin regulates to –100mV with respect to GND S, eliminating need for high-side current sense amplifiers or isolated sense paths. |
| Dual independent feedback loops | Simultaneous voltage (FB) and current (IFB) regulation with automatic transition between CC and CV modes - no external sequencing logic required. |
| Thermally robust PDIP package | N8 package provides 100°C/W junction-to-ambient thermal resistance (θJA), validated for continuous 1A charging in industrial ambient conditions. |
| Programmable charge current | Charging current can be dynamically adjusted using PWM-driven negative bias on IFB via external RC network - supports adaptive charging profiles. |
Applications
| Portable Medical Monitors | Industrial Handheld Terminals |
|---|---|
|
Use Scenario: Rechargeable Li-ion battery pack in a Class II medical device requiring safe, accurate charging under variable wall adapter input (5–24V) and strict voltage tolerance. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger controller managing SEPIC power stage; regulates float voltage to ±1% and limits charge current to 0.8A. Use Value: Eliminates risk of overvoltage damage to medical-grade batteries; ground-referred IFB simplifies PCB layout and reduces EMI-sensitive analog routing. |
Use Scenario: Ruggedized field terminal with hot-swappable battery, powered from 12V vehicle supply or USB-C PD source, needing reliable charging across wide input range. IC Role / Device Role / Timing Role: Primary battery charger IC implementing SEPIC topology to maintain charging even during engine cranking (VIN dip to 6V). Use Value: Maintains uninterrupted charging down to 2.4V input; dual GND pins prevent control-loop corruption from motor-driver noise on shared PCB ground. |
| Backup Power Systems | Smart Sensor Gateways |
|
Use Scenario: UPS module for remote IoT gateway, using lead-acid or LiFePO₄ battery with variable solar/battery input and requirement for programmable charge termination. IC Role / Device Role / Timing Role: Precision CC/CV charger supporting NiCd, NiMH, Pb-acid, and Li-ion chemistries via resistor-programmed thresholds and IFB bias adjustment. Use Value: Single IC supports multi-chemistry charging without firmware changes; 100mV current sense enables high-efficiency operation at low currents (<100mA). |
Use Scenario: Battery-powered edge sensor node with ultra-low standby power budget and need for graceful charge current scaling based on available solar harvest. IC Role / Device Role / Timing Role: Adaptive charger controller accepting PWM input to modulate charge current in real time, synchronized to system power manager. Use Value: Enables dynamic charge current reduction during low-light conditions without disabling charger - preserves battery health and extends runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3625EDD#TRPBF | 4mm × 3mm 10-lead DFN; integrated MOSFET drivers; supports 2A max charge current; requires external FETs for SEPIC. | Targets space-constrained portable designs; lacks native ground-referred current sense - requires high-side sensing or current-shunt monitor. | Select if board area is critical and higher current (>1A) or synchronous rectification is needed; not drop-in due to different pinout and control architecture. |
| MAX1771CSA+ | SO-8; 300kHz fixed frequency; no dedicated IFB pin - uses single FB loop with current-sense resistor in high-side path. | Suited for cost-sensitive NiCd/NiMH chargers; lacks ±1% Li-ion voltage accuracy and industrial temp grade. | Consider only for non-Li-ion applications where 2% voltage tolerance is acceptable and ambient stays within 0°C–70°C. |
Compared with LT1512IN8#PBF, LTC3625EDD#TRPBF offers higher integration and current but requires redesign for ground-referenced sensing, while MAX1771CSA+ lacks precision Li-ion support and industrial qualification - making LT1512IN8#PBF the optimal choice for rugged, accuracy-critical SEPIC-based Li-ion charging.
Availability
LT1512IN8#PBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld terminals, and backup power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1512IN8#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 technical support, manufacturing, and documentation for legacy Linear parts including the LT1512 series.
The LT1512 product line was designed specifically for high-accuracy, topology-flexible battery charging in industrial and portable equipment - emphasizing ground-referenced current sensing, wide-input operation, and robust thermal performance in through-hole packages.
FAQ
What is the maximum battery voltage supported by the LT1512IN8#PBF in SEPIC configuration?
The LT1512IN8#PBF itself does not impose a direct battery voltage limit; instead, the maximum allowable VBAT depends on input voltage per the relation VBAT ≤ 40V – VIN (due to 40V switch breakdown rating). For example, with VIN = 12V, VBAT may reach up to 28V - sufficient for up to 7-series Li-ion (29.4V) or 2-series LiFePO₄ (7.2V) stacks. Always verify worst-case switch voltage (VIN + VBAT) remains ≤40V.
Can the LT1512IN8#PBF be used with lithium iron phosphate (LiFePO₄) batteries?
Yes, the LT1512IN8#PBF supports LiFePO₄ charging by adjusting the R1/R2 feedback divider to set a 3.6V float voltage per cell. Its ±1% voltage accuracy and programmable current limit ensure safe CC/CV profiles. Use R2 = 12.4kΩ and calculate R1 per the formula in the datasheet to achieve precise 3.6V regulation - confirmed in Linear's application notes for multi-chemistry adaptation.
Why does the LT1512IN8#PBF have two separate ground pins (GND and GND S)?
The LT1512IN8#PBF separates GND (high-current switch return) from GND S (low-noise control ground) to prevent fast-switching transients from corrupting the FB and IFB feedback signals. This isolation is critical for stable regulation in SEPIC/flyback chargers. External voltage dividers, compensation networks, and IFB filters must connect exclusively to GND S - a design requirement explicitly validated in the LT1512IN8#PBF evaluation board layout.
Is the LT1512IN8#PBF pin-compatible with the commercial-grade LT1512CN8#PBF?
Yes, the LT1512IN8#PBF and LT1512CN8#PBF share identical 8-lead PDIP pinout, electrical functionality, and footprint. The only difference is temperature grading: LT1512IN8#PBF is specified for –40°C to +85°C ambient, while LT1512CN8#PBF is rated for 0°C to +70°C. No PCB change is required when upgrading to the industrial version.
How is charging current programmed on the LT1512IN8#PBF?
Charging current is set by the value of the external sense resistor R3, where ICHRG = 100mV / R3 (e.g., R3 = 0.1Ω → 1A). For dynamic control, a PWM signal can be applied via a peak-detector network (D2, C6, R5, R6) to inject adjustable negative bias into IFB - reducing effective sense voltage and thus lowering current. This method is documented in Figure 5 of the LT1512IN8#PBF datasheet and supports ~20–100% current scaling.
LT1512IN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1512IN8#PBF FAQ
1.How can I place an order for LT1512IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1512IN8#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 LT1512IN8#PBF reliable?
The price and inventory of LT1512IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1512IN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1512IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1512IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1512IN8#PBF?
LT1512IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1512IN8#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 LT1512IN8#PBF?
For technical support, including LT1512IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1512IN8#PBF requirements.
6.How does Aetrix verify that LT1512IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1512IN8#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 LT1512IN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1512IN8#PBF?
All LT1512IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1512IN8#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 LT1512IN8#PBF part is unused and in its original packaging.
Return procedure for LT1512IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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