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Analog Devices Inc. LT1370HVCR#PBF
- Part No.:
- LT1370HVCR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1370HVCR#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 6A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:295
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Product details
Overview
LT1370HVCR#PBF from Analog Devices (formerly Linear Technology) is a monolithic 500kHz current-mode switching regulator IC with integrated 6A power switch, designed for boost, buck, flyback, forward, inverting, and Cuk topologies. It regulates positive or negative outputs, features 42V switch breakdown voltage, 2.7V minimum input voltage, and 4.5mA typical quiescent current - enabling compact, high-efficiency laptop computer supplies and dual-output flyback converters.
For engineers reviewing the LT1370HVCR#PBF datasheet, LT1370HVCR#PBF pinout, LT1370HVCR#PBF application, or LT1370HVCR#PBF equivalent, key selection considerations include its 42V HV switch rating, ±2.48V dual-reference architecture (FB/NFB), 6A current-limited switch with 0.065Ω RDS(on), shutdown current of 12µA, and external synchronization capability up to 800kHz.
Technical Context
The LT1370HVCR#PBF implements current-mode control with adaptive anti-saturation driver circuitry, enabling precise pulse-by-pulse current limiting and fast transient response. Its error amplifier features nonlinear transconductance (1100–1900 µmho) that increases 10× above 40mV overdrive to suppress startup/overload overshoot.
Oscillator frequency shifts 5:1 under overload (e.g., FB < 0.6V), reducing stress on external components. The VC pin serves triple duty: loop compensation node, soft-start control point, and current-limit adjustment interface - all while maintaining stable regulation across 2.7V–25V input and 0°C–70°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Breakdown Voltage | 42V - enables operation with higher input rails or transient-tolerant designs vs standard LT1370 (35V) |
| Switch Current Limit | 6A typical - sets maximum peak inductor current; limits fault energy during short-circuit events |
| Switch ON Resistance | 0.065Ω typical - reduces conduction loss at full load; critical for >85% efficiency at 2A output |
| Reference Voltage (FB) | 1.245V ±15mV - defines positive output setpoint; low drift supports tight output regulation |
| Negative Reference (NFB) | –2.48V ±45mV - enables direct negative output sensing without external op-amps |
| Quiescent Current | 4.5mA typical - enables battery-powered operation with minimal standby drain |
| Shutdown Current | 12µA typical - allows ultra-low-power system sleep modes |
| Switching Frequency | 500kHz ±10% - permits use of sub-10µH inductors; balances EMI and efficiency trade-offs |
Pinout & Package
LT1370HVCR#PBF is housed in a 7-lead plastic DD package (R package) with exposed tab connected to GND. Thermal resistance is θJA = 30°C/W when soldered to 0.5 in² copper area over ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Error amplifier output / compensation node | External RC network sets loop stability; clamping controls soft-start and current limit |
| 2 - FB | Positive feedback input | Connects to resistor divider for +VOUT regulation; also triggers oscillator frequency shift during overload |
| 3 - NFB | Negative feedback input | Connects to resistor divider for –VOUT regulation; internal 100kΩ source resistor enables direct sensing |
| 4 - S/S | Shutdown & synchronization input | Logic-low (<1.3V) enables shutdown; 600–800kHz AC signal synchronizes switching |
| 5 - VIN | Input supply bypass | Requires ≥10µF low-ESR capacitor; undervoltage lockout activates below 2.5V |
| 6 - VSW | Switch collector node | Carries full 6A pulsed current; requires shortest possible PCB trace to minimize EMI and voltage spikes |
| 7 - GND | Power and signal ground | All ground pins must connect to low-impedance ground plane; tab is electrically tied to GND |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reference regulation | Simultaneous +1.245V (FB) and –2.48V (NFB) references enable single-chip dual-polarity output control without external amplifiers |
| Nonlinear error amplifier | Transconductance jumps 10× above 40mV overdrive, reducing output overshoot during startup and load recovery |
| Adaptive anti-saturation driver | Dynamically adjusts base drive to minimize switch saturation voltage and driver dissipation during high-current pulses |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB < 0.6V, lowering peak currents and protecting external components during overload |
| Logic-level shutdown & sync | S/S pin accepts standard TTL/CMOS logic; 12µA shutdown current and guaranteed 600–800kHz sync range simplify system integration |
Applications
| Boost Regulators | Laptop Computer Supplies |
|---|---|
Use Scenario: Step-up conversion from single Li-ion cell (2.7–4.2V) to stable 5V or 12V rail. IC Role / Device Role / Timing Role: Primary switching controller with integrated 6A switch and dual-reference feedback for precise output regulation. Use Value: Enables compact, high-efficiency boost converters with <2.7V start-up and <5mV load regulation error - critical for portable computing power integrity. | Use Scenario: Dual-rail generation (e.g., +15V and –15V) from a 5V or 12V intermediate bus in notebook subsystems. IC Role / Device Role / Timing Role: Flyback controller with simultaneous positive/negative output sensing via FB and NFB pins. Use Value: Eliminates need for separate regulators or op-amp-based negative reference circuits, reducing BOM count and board area by >30%. |
| Inverting Supplies | Laser Power Supplies |
Use Scenario: Generating –5V from 3.3V or 5V input for analog sensor biasing or op-amp rails. IC Role / Device Role / Timing Role: Inverting topology controller using NFB pin as primary feedback node with –2.48V reference. Use Value: Achieves <1% output accuracy without external components; 12µA shutdown current extends battery life in always-on instrumentation. | Use Scenario: Constant-current laser diode driver requiring tightly regulated, low-noise negative bias (e.g., –190V at 10mA). IC Role / Device Role / Timing Role: High-voltage flyback controller leveraging 42V switch rating and precision current-mode control for stable current delivery. Use Value: Supports >100:1 dynamic range in laser modulation; frequency shifting prevents transformer saturation during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780 | 4-switch synchronous buck-boost controller (external MOSFETs); no integrated switch; supports 4–36V input | Higher efficiency (>95%) at >3A loads; requires external gate drivers and layout complexity | Choose LTC3780 for high-current, wide-input applications where thermal management justifies added component count |
| LT3573 | 60V monolithic buck-boost regulator; 2.5A switch; fixed 500kHz frequency; no NFB pin or negative regulation | Limited to unidirectional output polarity; lower current rating but smaller footprint (16-pin QFN) | Choose LT3573 for space-constrained 5V-only systems where negative output is unnecessary |
Compared with LTC3780 and LT3573, the LT1370HVCR#PBF uniquely combines integrated 6A switching, 42V HV rating, and dual-polarity regulation in a 7-pin DD package - making it optimal for cost-sensitive, medium-power inverting or dual-output flyback designs where simplicity and board area are prioritized over peak efficiency or ultra-wide input range.
Availability
LT1370HVCR#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, dual-output flyback converters, inverting DC-DC supplies, and laser diode biasing requiring stable component supply and long-term industrial availability.
Supply support for LT1370HVCR#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 legacy Linear parts including the LT1370 family.
The LT1370HVCR#PBF belongs to Linear's high-frequency current-mode switching regulator product line, engineered for compact, efficient DC-DC conversion in portable, industrial, and test equipment where dual-polarity output and HV tolerance are required.
FAQ
What is the maximum input voltage rating for LT1370HVCR#PBF?
The LT1370HVCR#PBF has a 42V switch breakdown voltage (BVSW) and a 30V absolute maximum supply voltage (VIN). This HV variant is rated for operation up to 25V input continuously, with transient tolerance to 42V on the VSW pin - distinguishing it from the standard LT1370 (35V BVSW). Always observe derating guidelines per the datasheet for reliability at temperature extremes.
How does LT1370HVCR#PBF regulate negative output voltages?
The LT1370HVCR#PBF regulates negative outputs using its dedicated NFB pin, which references an internal –2.48V bandgap. Connecting a resistor divider from the negative output to NFB sets the output voltage per the formula –VOUT = VNFR(1 + R1/R2) + INFBR1. The LT1370HVCR#PBF's architecture uses the same main error amplifier for both polarities, eliminating need for external op-amps or level-shifters.
Can LT1370HVCR#PBF synchronize to an external clock?
Yes, the LT1370HVCR#PBF supports external synchronization via its S/S pin. A 600–800kHz logic-level square wave applied to S/S will lock the internal oscillator to that frequency. The part includes a 12µs resettable shutdown delay to prevent false shutdown during sync transitions. Operation above 700kHz may reduce slope compensation margin at >50% duty cycle.
What is the purpose of the VC pin on LT1370HVCR#PBF?
The VC pin on LT1370HVCR#PBF serves three critical functions: (1) output of the error amplifier for loop compensation (via RC network), (2) soft-start control point (capacitor coupling enables controlled ramp-up), and (3) current-limit adjustment interface (voltage clamping lowers trip threshold). During normal operation, VC sits between 1.0V and 1.9V depending on load.
Does LT1370HVCR#PBF require different layout practices than standard switching regulators?
Yes - due to its 6A switch and 500kHz operation, LT1370HVCR#PBF demands strict layout discipline: the VSW node trace must be shortest possible; input/output capacitors must be placed adjacent to VSW/GND; and a solid ground plane beneath the IC is mandatory. The high-speed circulating path (VSW → diode → output cap → GND → IC GND) must have minimal loop area to suppress EMI and ringing.
LT1370HVCR#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- 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):
- 42V (Switch)
- Current - Output:
- 6A (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
LT1370HVCR#PBF FAQ
1.How can I place an order for LT1370HVCR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1370HVCR#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 LT1370HVCR#PBF reliable?
The price and inventory of LT1370HVCR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1370HVCR#PBF is usually 5 days.
3.What payment methods are accepted for LT1370HVCR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1370HVCR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1370HVCR#PBF?
LT1370HVCR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1370HVCR#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 LT1370HVCR#PBF?
For technical support, including LT1370HVCR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1370HVCR#PBF requirements.
6.How does Aetrix verify that LT1370HVCR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1370HVCR#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 LT1370HVCR#PBF meets industry standards.
7.What is the process for return or replacement of LT1370HVCR#PBF?
All LT1370HVCR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1370HVCR#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 LT1370HVCR#PBF part is unused and in its original packaging.
Return procedure for LT1370HVCR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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