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Analog Devices Inc. LT1370HVIR#PBF
- Part No.:
- LT1370HVIR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1370HVIR#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 6A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
LT1370HVIR#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 delivers ±2.48V reference accuracy, 0.065Ω typical switch RDS(on), 2.7V minimum input voltage, and regulates both positive and negative outputs. Used in laptop computer supplies and dual-output flyback converters.
For engineers reviewing the LT1370HVIR#PBF datasheet, LT1370HVIR#PBF pinout, LT1370HVIR#PBF application, or LT1370HVIR#PBF equivalent, key selection factors include its 42V switch breakdown voltage (HV variant), –40°C to 125°C industrial temperature range, 12µA shutdown current, nonlinear error amplifier transconductance for reduced startup overshoot, and external synchronization capability up to 800kHz.
Technical Context
The LT1370HVIR#PBF implements current-mode control with adaptive anti-saturation driver circuitry that dynamically adjusts gate drive to minimize switch saturation voltage and enable rapid turn-off. Its error amplifier features nonlinear transconductance-increasing 10× when FB exceeds VREF by 40mV-to suppress output overshoot during startup and overload recovery.
Oscillator frequency shifts 5:1 (to ~100kHz) when FB drops below 0.6V, reducing minimum duty cycle and protecting external components under overload. The S/S pin serves dual functions: logic-level shutdown (threshold 0.6–2.0V) and synchronization (600–800kHz guaranteed range), with a 12µs resettable delay preventing false shutdown during sync pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 460–550 kHz typical; enables use of compact 4.7 µH inductors |
| Output Switch Breakdown Voltage | 42 V (HV variant); supports higher input/output voltage margins than standard LT1370 (35 V) |
| Switch Current Limit | 6 A typical; provides pulse-by-pulse overcurrent protection up to 10 A peak |
| Reference Voltage (FB) | 1.245 V ±15 mV; sets positive output via resistor divider with <550 nA input bias |
| Negative Feedback Reference (NFB) | –2.48 V ±45 mV; enables direct regulation of negative outputs without external op-amps |
| Quiescent Supply Current | 4.5 mA typical; low standby consumption for battery-powered systems |
| Shutdown Supply Current | 12 µA typical; reduces system power during idle/sleep modes |
| Operating Temperature Range | –40°C to 125°C (industrial grade); qualified for extended thermal environments |
Pinout & Package
LT1370HVIR#PBF is housed in a 7-lead plastic DD package (R package) with exposed tab for thermal dissipation. θJA = 30°C/W with 0.5 in² copper area on backside ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Compensation / Error Amplifier Output | 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; 1.245 V reference, 550 nA max bias |
| 3 - NFB | Negative Feedback Input | Connects to resistor divider for –VOUT regulation; –2.48 V reference, –30 µA bias |
| 4 - S/S | Shutdown & Synchronization | Logic-low (<0.6 V) enables shutdown; 600–800 kHz AC signal synchronizes switching |
| 5 - VIN | Input Supply Bypass | Requires ≥10 µF low-ESR capacitor; UVLO triggers below 2.5 V |
| 6 - VSW | Switch Collector Node | High-current path (6 A) to external inductor/diode; demands short, low-inductance layout |
| 7 - GND | Power Ground | Common return for internal circuitry and switch emitter; tie all GND pins to solid ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 6A Power Switch | Eliminates external MOSFET; 0.065 Ω typical RDS(on) reduces conduction loss at high load |
| Dual-Polarity Regulation | Single IC regulates +VOUT (via FB) and –VOUT (via NFB) without auxiliary amplifiers |
| Nonlinear Error Amplifier Transconductance | 10× gain boost at overload onset suppresses output overshoot during startup and recovery |
| Frequency-Shifting Overload Protection | Oscillator slows 5:1 when FB < 0.6 V, lowering peak switch current and stress on magnetics/diodes |
| External Synchronization | S/S pin accepts 600–800 kHz clock to eliminate beat frequencies in multi-regulator systems |
| Industrial Temperature Grade | Specified from –40°C to 125°C junction; suitable for automotive under-hood and industrial control applications |
Applications
| Laptop Computer Power Supplies | Dual-Output Flyback Converters |
|---|---|
Use Scenario: Generating isolated +15V and –15V rails from 2.7–10V input in portable computing systems. IC Role / Device Role / Timing Role: LT1370HVIR#PBF acts as primary-side controller with dual feedback (FB + NFB) to regulate both polarities simultaneously. Use Value: Eliminates need for separate regulators or optocoupler-based secondary-side feedback, reducing BOM count and board space. |
Use Scenario: Providing overvoltage-protected ±15V outputs in telecom line cards with tight thermal constraints. IC Role / Device Role / Timing Role: LT1370HVIR#PBF monitors both outputs directly and throttles switching if either exceeds setpoint. Use Value: Prevents unregulated voltage rise on lightly loaded outputs-critical for safeguarding downstream analog circuitry. |
| Inverting DC/DC Supplies | Laser Diode Biasing |
Use Scenario: Converting 3.3V single-cell Li-ion to –5V for op-amp biasing or sensor interfaces. IC Role / Device Role / Timing Role: LT1370HVIR#PBF operates in inverting topology with NFB-driven regulation and 2.7V start-up capability. Use Value: Achieves clean, low-noise negative rail without charge pumps or transformer-based designs. |
Use Scenario: Delivering stable, low-ripple current to 190Ω laser diodes in optical modules. IC Role / Device Role / Timing Role: LT1370HVIR#PBF configured as constant-current source using current-sense resistor in feedback path. Use Value: Leverages precise 1.245V reference and low-offset error amplifier to maintain ±1% current accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | 4-switch synchronous buck-boost controller; no integrated power switch; requires external MOSFETs | Supports wider VIN range (4–36 V); better efficiency above 3A but higher BOM cost and complexity | Select when >3A continuous output or >36V input is required; not drop-in compatible |
| LM5118MHX/NOPB | Current-mode buck-boost controller; 65V max switch voltage; 100–600 kHz adjustable frequency | Designed for wide-input industrial supplies; lacks NFB pin for native negative regulation | Choose for high-voltage industrial inputs where dual-polarity regulation is handled externally |
Compared with LTC3780EFE#PBF and LM5118MHX/NOPB, the LT1370HVIR#PBF offers integrated 6A switching, native dual-polarity feedback, and simpler layout-making it optimal for space-constrained, moderate-power (≤2.5A) applications requiring both +VOUT and –VOUT from a single IC.
Availability
LT1370HVIR#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 across industrial temperature ranges.
Supply support for LT1370HVIR#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1370HVIR#PBF belongs to Linear's legacy high-efficiency current-mode switching regulator family, engineered for flexible topology support (boost/buck/flyback/inverting), minimal external components, and robust operation in portable and industrial power systems.
FAQ
What is the maximum input voltage rating for the LT1370HVIR#PBF?
The LT1370HVIR#PBF has a 42V maximum switch breakdown voltage (BVSW), distinguishing it from the standard LT1370 (35V). Its supply voltage (VIN) is rated to 30V, and the S/S, SHDN, and SYNC pins tolerate up to 30V. This HV variant enables reliable operation in 24V industrial bus and 36V automotive transient environments where the standard part would risk failure.
How does the LT1370HVIR#PBF regulate negative output voltages?
The LT1370HVIR#PBF regulates negative outputs using its dedicated NFB pin, which references –2.48V internally. A resistor divider connects NFB to the negative output, and the internal negative feedback amplifier drives the FB pin to 1.245V to close the loop. This architecture avoids external op-amps while maintaining the same compensation network used for positive outputs-enabling true dual-polarity regulation with one IC.
Can the LT1370HVIR#PBF be synchronized to an external clock?
Yes-the S/S pin of the LT1370HVIR#PBF supports external synchronization from 600kHz to 800kHz. A logic-level AC signal within this range overrides the internal 500kHz oscillator. The part includes a 12µs resettable shutdown delay to prevent false triggering during sync transitions. Operation outside the guaranteed range may cause subharmonic oscillation above 50% duty cycle, especially with low-inductance designs.
What is the purpose of the VC pin on the LT1370HVIR#PBF?
The VC pin on the LT1370HVIR#PBF serves three critical functions: (1) it is the error amplifier output for loop compensation via external RC network; (2) it sets current limit via external clamp voltage; and (3) it enables soft-start through capacitor-coupled clamping. During normal operation, VC sits between 1.0V (light load) and 1.9V (heavy load); pulling it below 0.9V forces zero duty cycle and idle mode.
Does the LT1370HVIR#PBF support operation below 3V input?
Yes-the LT1370HVIR#PBF specifies a minimum input voltage of 2.7V and guarantees operation down to 2.4V (typical). Its internal low-dropout 2.3V regulator powers all internal circuitry, enabling stable regulation from single Li-ion (2.7–4.2V) or two NiMH cells. Undervoltage lockout disables switching only when VIN falls below 2.5V, ensuring graceful shutdown rather than erratic behavior.
LT1370HVIR#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
LT1370HVIR#PBF FAQ
1.How can I place an order for LT1370HVIR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1370HVIR#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 LT1370HVIR#PBF reliable?
The price and inventory of LT1370HVIR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1370HVIR#PBF is usually 5 days.
3.What payment methods are accepted for LT1370HVIR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1370HVIR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1370HVIR#PBF?
LT1370HVIR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1370HVIR#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 LT1370HVIR#PBF?
For technical support, including LT1370HVIR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1370HVIR#PBF requirements.
6.How does Aetrix verify that LT1370HVIR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1370HVIR#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 LT1370HVIR#PBF meets industry standards.
7.What is the process for return or replacement of LT1370HVIR#PBF?
All LT1370HVIR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1370HVIR#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 LT1370HVIR#PBF part is unused and in its original packaging.
Return procedure for LT1370HVIR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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