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Analog Devices Inc. LT1372CS8#TRPBF
- Part No.:
- LT1372CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1372CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,229
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Product details
Overview
LT1372CS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 500kHz current-mode switching regulator IC in an 8-pin SOIC package, integrating a 1.5A power switch, oscillator, error amplifier, and protection circuitry. It supports boost, buck, flyback, inverting, and Cuk topologies, operates down to 2.7V input, delivers up to 0.29A output in boost configuration, and regulates both positive (1.245V reference) and negative (–2.49V reference) outputs - used in laptop power supplies and CCFL backlight drivers.
For engineers reviewing the LT1372CS8#TRPBF datasheet, LT1372CS8#TRPBF pinout, LT1372CS8#TRPBF application, or LT1372CS8#TRPBF equivalent, key selection considerations include its 500kHz fixed switching frequency, 1.5A integrated switch with 0.8Ω typical RDS(on), dual feedback architecture (FB/NFB), shutdown current of 12µA, and SO-8 thermal resistance of 120°C/W - all critical for compact, high-efficiency DC/DC designs.
Technical Context
The LT1372CS8#TRPBF employs peak-current-mode control: the internal 1.5A switch turns on at each oscillator cycle and off when sensed current reaches a level set by the VC pin voltage. This provides inherent cycle-by-cycle current limiting, fast line transient response, and simplified loop compensation via the VC pin's transconductance (1500 µmho typ).
It features dual feedback paths - FB pin for positive output regulation (1.245V reference) and NFB pin for negative output regulation (–2.49V reference) - enabling single-chip dual-polarity supplies. The S/S pin serves as both logic-compatible shutdown input (1.3V threshold) and synchronization input (600–800kHz range), while the GNDS pin provides a clean reference for internal amplifiers separate from high-current GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz ±10% - enables use of small 4.7µH inductors and reduces filter size vs lower-frequency regulators. |
| Integrated Switch Current Limit | 1.5 A typical - sets maximum deliverable output current in boost/buck configurations; limits fault energy during overload. |
| Reference Voltage (FB) | 1.245 V ±1.2% - defines output voltage accuracy in positive-output applications using resistor divider feedback. |
| Input Voltage Range | 2.7 V to 25 V - supports single-cell Li-ion (2.7V cutoff) through 24V industrial rails without external bias. |
| Quiescent Supply Current | 4 mA typical - minimizes no-load power loss in battery-powered systems like laptops and portable instruments. |
| Shutdown Supply Current | 12 µA typical - enables ultra-low-power standby mode; suitable for always-on subsystems requiring <15 µA sleep current. |
| Error Amplifier Transconductance | 1500 µmho typical - determines loop gain and compensation component values; nonlinear gm reduces startup overshoot. |
| Thermal Resistance θJA | 120 °C/W (SO-8) - defines junction-to-ambient temperature rise under PCB layout with standard copper pour; requires heatsinking above ~1W dissipation. |
Pinout & Package
LT1372CS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with standard JEDEC MS-012AC dimensions (4.9mm × 3.9mm × 1.45mm), rated for 0°C to 125°C operation and 120°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation / Current Limit / Soft-Start Node | Output of error amplifier; connects to RC network for loop compensation; clamping controls current limit and enables soft-start. |
| FB (Pin 2) | Positive Output Feedback Input | Inverting input of main error amplifier; referenced to 1.245V internal bandgap; used for regulating positive output voltages. |
| NFB (Pin 3) | Negative Output Feedback Input | Connects to inverting input of negative feedback amplifier via 100kΩ internal resistor; regulates at –2.49V reference for negative outputs. |
| S/S (Pin 4) | Shutdown & Synchronization Input | Logic-level compatible; low = shutdown (12µA IQ); driven with 600–800kHz square wave for external clock sync. |
| VIN (Pin 5) | Power Input Supply | Bypass with ≥10µF capacitor; UVLO activates below 2.5V; powers internal 2.3V LDO for core circuitry. |
| GNDS (Pin 6) | Clean Ground Reference | Reference node for internal reference, error amp, and NFB amp; must be connected to quiet ground near FB/NFB dividers. |
| GND (Pin 7) | Power Ground | Emiter connection of 1.5A switch; carries high pulsed currents; requires low-inductance connection to main ground plane. |
| VSW (Pin 8) | Switch Collector Node | Collector of internal NPN switch; connects to inductor/diode; requires shortest possible trace to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control architecture | Enables stable operation across wide VIN/VOUT ranges and simplifies compensation; provides inherent pulse-by-pulse overcurrent protection. |
| Dual feedback capability (FB + NFB) | Allows single IC to regulate both positive and negative outputs simultaneously - e.g., ±12V dual-rail supplies without extra controllers. |
| Nonlinear error amplifier transconductance | Increases gm 10× when FB exceeds VREF by 40mV - actively suppresses output overshoot during startup and load recovery. |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB < 0.6V - lowers switch stress and improves regulation during overload or short-circuit conditions. |
| Logic-compatible shutdown with 12µA IQ | Supports microcontroller-driven power sequencing; eliminates need for external enable logic or level shifters in low-power systems. |
| Internal 2.3V low-dropout regulator | Stabilizes internal bias rails from 2.7V input - ensures consistent performance across full input range without external bias supply. |
Applications
| Laptop Computer Power Supply | CCFL Backlight Driver |
|---|---|
Use Scenario: Generating 12V–19V rail from 3.3V or 5V system bus to power display interface and analog circuitry in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary boost regulator controlling inductor current via VC pin; FB pin senses output; S/S pin enables dynamic power-down during display sleep. Use Value: 500kHz operation allows 4.7µH inductor and <0.5 in² board area; 4mA quiescent current extends battery life; dual feedback supports auxiliary negative bias for LCD bias networks. |
Use Scenario: Driving cold cathode fluorescent lamp (CCFL) strings requiring 600–1000V AC with regulated current in thin-film transistor (TFT) LCD panels. IC Role / Device Role / Timing Role: High-frequency flyback controller; VSW drives primary-side MOSFET; NFB pin regulates negative auxiliary rail for lamp return path. Use Value: 1.5A switch handles high peak currents during lamp ignition; oscillator frequency shifting prevents transformer saturation during lamp strike; SO-8 package fits tight bezel space. |
| Multiple-Output Flyback Supply | Inverting DC/DC Converter |
Use Scenario: Providing isolated +15V and –15V rails from 12V input in industrial sensor modules where dual polarity is required for op-amp biasing. IC Role / Device Role / Timing Role: Flyback controller with simultaneous FB and NFB sensing; regulates both outputs independently using shared transformer secondary windings. Use Value: Eliminates need for secondary-side optocouplers or post-regulators; 120°C/W θJA enables convection-cooled design; GNDS pin isolates feedback references from noisy power ground. |
Use Scenario: Converting +5V USB power to –5V for legacy RS-232 transceivers or analog front-end signal conditioning in IoT gateways. IC Role / Device Role / Timing Role: Inverting topology controller; NFB pin directly senses negative output; FB pin left open; S/S pin synchronized to system clock for EMI reduction. Use Value: –2.49V NFB reference enables precise –5V output with <1% error; 2.7V minimum input supports operation from partially discharged batteries; 8-pin SOIC simplifies 2-layer PCB routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1372IS8#TRPBF | Same die, Industrial-grade (–40°C to 125°C) temperature rating vs Commercial (0°C to 125°C) for LT1372CS8#TRPBF; identical electrical specs. | Required for automotive cabin modules or industrial PLCs operating outside 0°C ambient. | Select LT1372IS8#TRPBF when extended temperature qualification is mandatory; otherwise LT1372CS8#TRPBF suffices for consumer/commercial designs. |
| LT1377CS8#TRPBF | 1MHz switching frequency (vs 500kHz), same package and pinout; lower max output current (0.35A vs 0.29A in boost) due to higher switching losses. | Better suited for ultra-compact designs needing smallest possible inductors (e.g., 2.2µH) where efficiency at light loads is less critical than size. | Choose LT1377CS8#TRPBF only when board area is constrained and 1MHz operation doesn't compromise thermal budget; verify inductor saturation margin at 1MHz. |
Compared with LT1372IS8#TRPBF, the LT1372CS8#TRPBF trades extended temperature range for lower cost and qualification overhead; compared with LT1377CS8#TRPBF, it offers higher boost output current and better light-load efficiency at the expense of larger magnetics - making LT1372CS8#TRPBF optimal for cost-sensitive, thermally constrained 500kHz boost applications.
Availability
LT1372CS8#TRPBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, multiple-output flyback supplies, and inverting DC/DC converters requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.
Supply support for LT1372CS8#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio, emphasizing precision, reliability, and application-specific integration for industrial, automotive, and communications markets.
The LT1372CS8#TRPBF belongs to Linear's legacy monolithic switching regulator family designed for compact, high-efficiency DC/DC conversion in space-constrained portable and embedded systems - prioritizing integration, low quiescent current, and multi-topology flexibility.
FAQ
What is the maximum output current achievable with the LT1372CS8#TRPBF in a boost configuration?
The LT1372CS8#TRPBF supports up to 0.29A output current in boost topology at typical conditions (VIN = 5V, VOUT = 12V). This limit arises from the 1.5A switch current rating, duty cycle constraints, and thermal dissipation in the SO-8 package. Higher output currents require careful thermal design, lower VIN–VOUT differentials, or forced airflow - exceeding 0.29A risks thermal shutdown or reduced reliability.
Can the LT1372CS8#TRPBF regulate both positive and negative outputs simultaneously?
Yes, the LT1372CS8#TRPBF can regulate both polarities simultaneously using its dual feedback architecture: the FB pin senses positive output voltage against a 1.245V reference, while the NFB pin senses negative output against a –2.49V reference. When both pins are active, the IC prevents either output from exceeding its setpoint - ideal for dual-rail flyback supplies without secondary-side regulation.
What is the purpose of the GNDS (Pin 6) versus GND (Pin 7) on the LT1372CS8#TRPBF?
GNDS (Pin 6) is the "clean" ground reference for the internal bandgap reference, error amplifier, and NFB amplifier - it must connect to a quiet ground node near the feedback resistors. GND (Pin 7) is the high-current power ground for the 1.5A switch emitter - it carries large pulsed currents and must route directly to the main ground plane. Separating these grounds prevents noise coupling into regulation loops.
Does the LT1372CS8#TRPBF require an external diode in boost configuration?
Yes, the LT1372CS8#TRPBF requires an external Schottky diode (e.g., MBRS120T3 or 1N5818) in boost topology. The IC integrates only the high-side NPN switch; the diode provides the current path during switch-off time and blocks reverse voltage during switch-on. Diode selection must consider 30V+ PIV rating, ≤0.5V forward drop at peak current, and adequate surge capability.
How does the LT1372CS8#TRPBF handle overload or short-circuit conditions?
The LT1372CS8#TRPBF uses three coordinated protections: (1) cycle-by-cycle current limiting via the 1.5A switch, (2) oscillator frequency shifting (5:1 reduction) when FB drops below 0.6V to reduce stress, and (3) thermal shutdown at 150°C junction temperature. These mechanisms prevent destructive failure during sustained overload but do not provide hiccup-mode recovery - external current limiting may be needed for indefinite short-circuit operation.
LT1372CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.245V
- Voltage - Output (Max):
- 35V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1372CS8#TRPBF FAQ
1.How can I place an order for LT1372CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1372CS8#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 LT1372CS8#TRPBF reliable?
The price and inventory of LT1372CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1372CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1372CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1372CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1372CS8#TRPBF?
LT1372CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1372CS8#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 LT1372CS8#TRPBF?
For technical support, including LT1372CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1372CS8#TRPBF requirements.
6.How does Aetrix verify that LT1372CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1372CS8#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 LT1372CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1372CS8#TRPBF?
All LT1372CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1372CS8#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 LT1372CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1372CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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