My Inquiry
My Account
Analog Devices Inc. LT1371CR#TRPBF
- Part No.:
- LT1371CR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1371CR#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,342
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1371CR#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 500kHz current-mode switching regulator IC with integrated 3A power switch, supporting boost, buck, flyback, inverting, and Cuk topologies. It delivers up to 0.8A output at 12V from 5V input with >90% efficiency, operates down to 2.7V supply, and regulates both positive and negative outputs. Used in laptop computer supplies and multiple-output flyback converters.
For engineers reviewing the LT1371CR#TRPBF datasheet, LT1371CR#TRPBF pinout, LT1371CR#TRPBF application, or LT1371CR#TRPBF equivalent, key selection considerations include its 3A internal switch, ±2.49V dual-reference architecture, 12µA shutdown current, 500kHz fixed-frequency operation, and 7-lead DD package thermal performance (θJA = 30°C/W).
Technical Context
The LT1371CR#TRPBF implements peak-current-mode control with adaptive anti-saturation driver circuitry, enabling fast switch turn-off and minimizing conduction loss. Its error amplifier features nonlinear transconductance (1100–1900 µmho) that increases 10× above 40mV FB error to suppress startup/overload overshoot.
Oscillator frequency shifts 5:1 under overload (FB < 0.6V), reducing stress on external components. The VC pin serves triple function-error amplifier output, soft-start node, and current-limit adjustment point-with internal 1.245V (FB) and –2.49V (NFB) references enabling dual-polarity regulation without external op-amps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz typical; enables use of 4.7 µH inductors and reduces filter size vs. lower-frequency regulators. |
| Integrated Switch Current Limit | 3.0 A minimum; supports high-power boost/buck conversion without external MOSFETs. |
| Input Voltage Range | 2.7 V to 25 V; allows direct operation from single-cell Li-ion (2.7V cutoff) or multi-cell battery stacks. |
| Quiescent Supply Current | 4 mA typical; minimizes no-load power loss in battery-powered systems. |
| Shutdown Current | 12 µA typical; extends battery life during system sleep modes. |
| Reference Voltage (FB) | 1.245 V ±1.2%; sets output voltage via resistor divider with low sensitivity to VIN variation (0.01%/V line regulation). |
| Negative Reference (NFB) | –2.490 V ±2%; enables direct negative output regulation without inverting op-amp stage. |
| Package Thermal Resistance | θJA = 30°C/W (with 0.5 in² copper); supports 3A switching in compact surface-mount layout. |
Pinout & Package
LT1371CR#TRPBF uses a 7-lead plastic DD (R) package with exposed tab for thermal dissipation. Pin 1 is VC; pins 2–7 are FB, NFB, GND, VIN, S/S, and VSW respectively. The tab is electrically connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Accepts RC network for loop stability; clamping controls soft-start and current limit; voltage range 1.0–1.9 V reflects load condition. |
| FB (Pin 2) | Positive output voltage sense input | Connects to resistor divider for +VOUT regulation; 250 nA bias current enables high-impedance feedback networks. |
| NFB (Pin 3) | Negative output voltage sense input | Provides –2.49 V reference for –VOUT regulation; –30 µA bias current requires compensation in divider design. |
| GND (Pin 4) | Power and signal ground reference | Multiple GND pins (4, 5) reduce ground impedance; tab must be soldered directly to PCB ground plane. |
| VIN (Pin 5) | Main input supply connection | Requires ≥10 µF low-ESR capacitor; UVLO activates below 2.5 V to prevent erratic operation. |
| S/S (Pin 6) | Shutdown and synchronization input | Logic-low (<0.6 V) enables 12 µA shutdown; 600–800 kHz AC signal synchronizes switching frequency. |
| VSW (Pin 7) | Switch collector node | Carries full 3A pulsed current; requires shortest possible trace to diode/capacitor to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reference regulation | Simultaneous +1.245 V (FB) and –2.49 V (NFB) references enable single-chip dual-polarity supplies without external amplifiers. |
| Nonlinear error amplifier transconductance | 10× gain increase above 40 mV FB error reduces output overshoot during startup and load transients. |
| Oscillator frequency shifting | 5:1 reduction when FB < 0.6 V protects external components during overload or short-circuit conditions. |
| Adaptive anti-saturation driver | Detects switch saturation onset and adjusts drive current in real time to minimize VCE(sat) and improve efficiency. |
| Low minimum input voltage | 2.7 V operation supports single-cell Li-ion and NiMH battery inputs without pre-regulation. |
| External synchronization | S/S pin accepts 600–800 kHz logic-level signal to eliminate beat frequencies in multi-regulator systems. |
Applications
| Laptop Computer Supplies | Multiple-Output Flyback Supplies |
|---|---|
Use Scenario: Generating 12V rail from 5V USB-C PD source in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing boost topology with integrated 3A switch and dual-reference feedback. Use Value: Eliminates need for external high-side MOSFET and gate driver; 4mA quiescent current extends battery runtime during light-load states. |
Use Scenario: Isolated dual-output (±12V) supply for analog front-end in industrial data acquisition modules. IC Role / Device Role / Timing Role: Regulates both polarities simultaneously using FB and NFB pins with shared oscillator and current-sense path. Use Value: Reduces component count by 40% vs. dual-controller solution; frequency shifting prevents transformer saturation during overloads. |
| Inverting Supplies | Boost Regulators |
Use Scenario: Generating –5V rail from 3.3V system bus for RS-232 interface ICs in embedded controllers. IC Role / Device Role / Timing Role: Inverting converter controller with –2.49V NFB reference and internal 3A switch handling continuous 1A output. Use Value: Achieves –5V @ 1A with <1% output error across temperature; eliminates discrete inverter stage and associated BOM cost. |
Use Scenario: Stepping 5V USB input to 12V for SSD power delivery in portable storage enclosures. IC Role / Device Role / Timing Role: High-efficiency boost controller operating at 500kHz to minimize inductor size (4.7µH) and EMI filtering requirements. Use Value: Delivers 0.8A at 90%+ efficiency with <50mVpp output ripple using two parallel 22µF tantalum capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3573EDD#TRPBF | Higher 3MHz switching frequency; 2.5A switch; requires external compensation; no NFB pin. | Optimized for ultra-small inductors (1µH) and space-constrained designs; lacks native negative output capability. | Select when board area is critical and only positive outputs are needed; avoid if dual-polarity regulation is required. |
| TPS55340RTER | 3.5A switch; 1.2MHz fixed frequency; integrated soft-start; no negative reference; TI WEBENCH support. | Better suited for high-current boost (up to 2A) with simplified layout; no built-in inverting topology support. | Prefer for production designs requiring TI's design ecosystem and higher output current; not drop-in for NFB-based circuits. |
Compared with LT1371CR#TRPBF, LT3573EDD#TRPBF offers higher frequency and smaller magnetics but sacrifices dual-polarity regulation, while TPS55340RTER provides greater current capacity and design tool support but lacks the –2.49V reference essential for inverting supplies.
Availability
LT1371CR#TRPBF is available at Aetrix Electronics and suitable for laptop computer supplies, multiple-output flyback supplies, and inverting power supplies requiring stable component supply, long-term industrial availability, and consistent parametric performance across temperature.
Supply support for LT1371CR#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 product lines with rigorous qualification and long-term support.
The LT1371CR#TRPBF belongs to Linear's legacy high-efficiency current-mode switching regulator family, designed specifically for compact, multi-topology DC-DC conversion in portable and industrial equipment where dual-polarity output and low quiescent current are critical.
FAQ
What is the maximum output current achievable with LT1371CR#TRPBF in boost configuration?
The LT1371CR#TRPBF supports up to 0.8A output current in a 5V-to-12V boost configuration, as verified in the Typical Application circuit (TA02) with 4.7µH inductor and 22µF×2 output capacitors. This limit arises from thermal constraints of the 7-lead DD package (θJA = 30°C/W) and the 3A switch current rating under continuous duty cycle conditions. Higher currents require forced air cooling or derating.
Can LT1371CR#TRPBF regulate negative output voltages without external op-amps?
Yes, the LT1371CR#TRPBF can directly regulate negative outputs using its dedicated NFB pin, which references –2.49V internally. When the NFB pin is connected to a resistor divider from the negative rail, the IC maintains regulation without external amplifiers. The FB pin remains open in this mode, and the error amplifier's output drives the VC pin to control the switch-enabling true inverting converter operation with minimal external components.
What is the purpose of the VC pin on LT1371CR#TRPBF, and how is it used in compensation?
The VC pin on LT1371CR#TRPBF is the error amplifier output and serves three functions: loop compensation, soft-start control, and current limit adjustment. For compensation, a series RC network (e.g., 100kΩ + 10nF) connects VC to GND to place a dominant pole near 10Hz and a zero near 1.6kHz, ensuring phase margin >45° across load and input variations. Clamping VC with a Zener diode also limits peak switch current during transient overload.
Does LT1371CR#TRPBF support external clock synchronization, and what is the valid frequency range?
Yes, the LT1371CR#TRPBF supports external synchronization via its S/S pin, which accepts TTL/CMOS-compatible signals between 600kHz and 800kHz. This range is guaranteed across temperature and ensures reliable locking without subharmonic oscillation. Operation above 700kHz requires caution due to reduced internal slope compensation amplitude, particularly at >50% duty cycle-higher inductance values mitigate this risk.
How does LT1371CR#TRPBF protect against overload conditions?
The LT1371CR#TRPBF employs dual overload protection: (1) pulse-by-pulse current limiting caps switch current at 3.0A minimum, and (2) oscillator frequency shifting reduces switching frequency 5:1 when FB voltage drops below 0.6V-indicating severe overload or short circuit. This lowers average power dissipation and prevents thermal runaway. Additionally, the 125°C junction temperature limit triggers thermal shutdown, and the 12µA shutdown current minimizes heat generation during fault holdoff.
LT1371CR#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- 3A (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1371CR#TRPBF FAQ
1.How can I place an order for LT1371CR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1371CR#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 LT1371CR#TRPBF reliable?
The price and inventory of LT1371CR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1371CR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1371CR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1371CR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1371CR#TRPBF?
LT1371CR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1371CR#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 LT1371CR#TRPBF?
For technical support, including LT1371CR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1371CR#TRPBF requirements.
6.How does Aetrix verify that LT1371CR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1371CR#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 LT1371CR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1371CR#TRPBF?
All LT1371CR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1371CR#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 LT1371CR#TRPBF part is unused and in its original packaging.
Return procedure for LT1371CR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1371CR#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
