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Analog Devices Inc. LT1370HVIR#TRPBF
- Part No.:
- LT1370HVIR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1370HVIR#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 6A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,441
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Product details
Overview
LT1370HVIR#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 500kHz current-mode switching regulator IC with integrated 6A power switch, designed for high-efficiency boost, buck, flyback, inverting, and Cuk topologies. It operates from 2.7V input, delivers ±1.245V/–2.48V reference accuracy, features 0.065Ω typical switch RDS(on), and supports dual-polarity output regulation - used in laptop power supplies, dual-output flyback converters, and Li-ion battery-powered 5V SEPIC systems.
For engineers reviewing the LT1370HVIR#TRPBF datasheet, LT1370HVIR#TRPBF pinout, LT1370HVIR#TRPBF application, or LT1370HVIR#TRPBF equivalent, key selection criteria include its 42V switch breakdown voltage (HV variant), –40°C to 125°C industrial temperature range, 12µA shutdown current, external synchronization capability (600–800kHz), and nonlinear error amplifier transconductance for reduced startup overshoot.
Technical Context
The LT1370HVIR#TRPBF implements current-mode control with adaptive anti-saturation driver circuitry, enabling precise pulse-by-pulse current limiting and fast transient response. Its error amplifier provides nonlinear transconductance (700–2300 µmho) and dual-reference architecture: +1.245V at FB pin for positive outputs and –2.48V at NFB pin for negative outputs - both referenced to internal bandgap.
Oscillator frequency shifts 5:1 under overload (FB < 0.6V), reducing stress on external components. The VC pin serves triple function: compensation node (RC network), soft-start control, and current limit adjustment via external clamping - all while maintaining stable loop behavior across 2.7V–25V input and wide load/temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 460–550 kHz typ; enables use of compact 4.7 µH inductors without sacrificing efficiency or stability. |
| Output Switch Breakdown Voltage | 42 V (HV variant); supports higher input/output differential in industrial flyback or boost designs. |
| Switch ON Resistance | 0.065 Ω typ; reduces conduction loss at 6 A peak, critical for >90% efficiency at 1.8–2 A loads. |
| Reference Voltage Accuracy | ±1.2% over temp (1.230–1.260 V at FB); ensures tight output regulation without trimming in 12 V boost or ±15 V dual-flyback. |
| Shutdown Supply Current | 12 µA typ; enables ultra-low-power hold-up in battery-backed systems during standby. |
| Negative Feedback Reference | –2.48 V at NFB pin; allows direct sensing of negative rails (e.g., –5 V, –15 V) without external op-amps. |
| Operating Temperature Range | –40°C to 125°C junction; validated for industrial embedded power supplies with no derating up to 125°C. |
Pinout & Package
LT1370HVIR#TRPBF uses a 7-lead plastic DD (R) package with exposed tab connected to GND for thermal dissipation. Thermal resistance is θJA = 30°C/W (with 0.5 in² copper area), θJC = 4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Error amplifier output / compensation node | Accepts RC network for loop stability; clamping controls soft-start and current limit; voltage range 0.9–1.9 V reflects load condition. |
| 2 - FB | Positive feedback input | Senses positive output via resistor divider; internal 1.245 V reference enables accurate regulation without external references. |
| 3 - NFB | Negative feedback input | Senses negative output via resistor divider; internal –2.48 V reference eliminates need for inverting op-amp in inverting supplies. |
| 4 - S/S | Shutdown & synchronization input | Logic-level compatible: low = shutdown (12 µA IQ); 600–800 kHz AC signal synchronizes switching to avoid EMI peaks. |
| 5 - VIN | Input supply bypass | Requires ≥10 µF low-ESR capacitor; undervoltage lockout activates below 2.5 V to prevent erratic operation. |
| 6 - VSW | Power switch collector | Carries full switched current (up to 6 A); trace must be short and wide to minimize radiation and voltage spikes. |
| 7 - GND | Ground reference | All ground pins tied to common low-impedance plane; tab is electrically connected to GND for thermal path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity regulation architecture | Single IC regulates both positive (via FB) and negative (via NFB) outputs - eliminates second controller in dual-rail systems like ±15 V flyback. |
| Nonlinear error amplifier transconductance | Transconductance increases 10× when FB exceeds VREF by 40 mV - suppresses output overshoot during startup or overload recovery. |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB < 0.6 V - limits peak switch current and protects diode/inductor during sustained overload. |
| External synchronization support | Accepts 600–800 kHz logic-level sync signal on S/S pin - enables EMI reduction by aligning switching edges with system clock or noise-free windows. |
| High-voltage switch rating | 42 V breakdown (HV variant) - supports 36 V input rails or 24 V output boost configurations where standard LT1370 (35 V) would fail. |
Applications
| Laptop Computer Power Supply | Dual-Output Flyback Converter |
|---|---|
|
Use Scenario: Step-up from single-cell Li-ion (2.7–4.2 V) to regulated 12 V for display backlight or peripheral bus. IC Role / Device Role / Timing Role: Primary controller in non-isolated boost topology; manages current-mode PWM, soft-start, and input UVLO. Use Value: Enables compact, high-efficiency design using 4.7 µH inductor and 22 µF solid tantalum output caps - meeting portable device size and thermal constraints. |
Use Scenario: Simultaneous +15 V and –15 V isolated outputs from 5–10 V input in test equipment or analog signal chains. IC Role / Device Role / Timing Role: Dual-feedback controller regulating both rails independently via FB and NFB pins; prevents either rail from overvoltage during load imbalance. Use Value: Eliminates need for separate regulators or opto-coupled feedback, reducing BOM count and improving cross-regulation without sacrificing isolation integrity. |
| Li-ion to 5 V SEPIC Converter | Laser Diode Bias Supply |
|
Use Scenario: Regulated 5 V output from two-series Li-ion (4–9 V), where input may be above or below output voltage. IC Role / Device Role / Timing Role: Controller in SEPIC topology; leverages current-mode stability and wide duty cycle (up to 95%) to maintain regulation across full battery discharge curve. Use Value: Delivers up to 2.8 A at 5 V with >88% efficiency - sufficient for USB-powered peripherals or FPGA core rails without thermal throttling. |
Use Scenario: Precision constant-current bias for 190 Ω laser diode requiring low-noise, tightly regulated voltage in optical modules. IC Role / Device Role / Timing Role: High-stability voltage source with low ripple (<50 mVP-P) via VC-pin filtering; uses oscillator shift to limit inrush during turn-on. Use Value: Prevents laser threshold drift and mode hopping by maintaining <±1% output variation across temperature and line changes - critical for telecom-grade lasers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1370IR#TRPBF | 35 V switch breakdown (vs. 42 V); same pinout, package, and temperature range (–40°C to 125°C). | Not suitable for >35 V input/output differential; requires redesign if operating near 40 V rails. | Select LT1370HVIR#TRPBF only when input or reflected voltage exceeds 35 V - e.g., 36 V industrial input or 24 V boost to 48 V. |
| LT3757AIMSE#TRPBF | Higher 100 V switch rating; 100 kHz–1 MHz programmable frequency; requires external MOSFET but offers better light-load efficiency. | Targets higher-voltage flyback/isolated applications; lacks integrated NFB pin for direct negative regulation. | Choose LT3757AIMSE#TRPBF for >42 V designs or when adjustable frequency and external FET flexibility outweigh integrated simplicity. |
Compared with LT1370IR#TRPBF, LT1370HVIR#TRPBF adds 7 V headroom for robustness in fluctuating industrial inputs; compared with LT3757AIMSE#TRPBF, it trades off voltage range and programmability for lower BOM count and native dual-polarity control - making it optimal for cost-sensitive, space-constrained dual-rail systems under 42 V.
Availability
LT1370HVIR#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered portable electronics, and dual-output isolated converters requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LT1370HVIR#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 legacy of high-performance analog and power management ICs, emphasizing precision, reliability, and application-specific integration.
The LT1370 family was designed for flexible, high-efficiency DC/DC conversion in space- and thermal-constrained systems - targeting laptop adapters, industrial flyback supplies, and battery-powered instrumentation where dual-polarity regulation and wide input range are essential.
FAQ
What is the maximum input voltage supported by the LT1370HVIR#TRPBF?
The LT1370HVIR#TRPBF supports a maximum supply voltage of 30 V on the VIN pin. Its integrated switch has a 42 V breakdown rating, allowing safe operation with reflected voltages up to 42 V - critical for flyback or boost topologies where VSW exceeds VIN. This distinguishes it from the standard LT1370 (35 V switch) and LT1370IR (35 V switch).
How does the LT1370HVIR#TRPBF regulate negative output voltages?
The LT1370HVIR#TRPBF regulates negative outputs using its dedicated NFB pin, which references an internal –2.48 V threshold. A resistor divider connects the negative output to NFB, while the FB pin remains open. The internal negative feedback amplifier drives the FB pin to +1.245 V, enabling direct regulation without external op-amps - a feature confirmed in the LT1370HVIR#TRPBF datasheet Figure 2 and Typical Application TA03.
Can the LT1370HVIR#TRPBF synchronize to an external clock?
Yes, the LT1370HVIR#TRPBF supports external synchronization via its S/S pin. A logic-level square wave between 600 kHz and 800 kHz can be applied to synchronize switching frequency - reducing EMI by aligning edges with system clocks or quiet time windows. The part includes a 12 µs resetable delay to prevent false shutdown during sync pulses, as specified in the Electrical Characteristics table.
What is the purpose of the VC pin on the LT1370HVIR#TRPBF?
The VC pin on the LT1370HVIR#TRPBF serves three critical functions: (1) loop compensation node (accepts RC network), (2) soft-start control (capacitor-coupled clamp), and (3) current limit adjustment (voltage clamping). Its voltage (0.9–1.9 V) reflects load demand, and external clamping directly modulates switch current limit - a key feature documented in the Applications Information section and Block Diagram.
Does the LT1370HVIR#TRPBF require different layout practices than standard buck controllers?
Yes - due to its high-speed 6 A switch and nanosecond rise/fall times, the LT1370HVIR#TRPBF demands strict layout discipline: VSW, output diode, and output capacitor traces must be extremely short and wide; a solid ground plane beneath the switch node is mandatory; and the high-frequency circulating path (VSW → diode → COUT → GND → IC GND) must be minimized per Figure 4 in the LT1370HVIR#TRPBF datasheet to suppress EMI and ringing.
LT1370HVIR#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):
- 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#TRPBF FAQ
1.How can I place an order for LT1370HVIR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1370HVIR#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 LT1370HVIR#TRPBF reliable?
The price and inventory of LT1370HVIR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1370HVIR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1370HVIR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1370HVIR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1370HVIR#TRPBF?
LT1370HVIR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1370HVIR#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 LT1370HVIR#TRPBF?
For technical support, including LT1370HVIR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1370HVIR#TRPBF requirements.
6.How does Aetrix verify that LT1370HVIR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1370HVIR#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 LT1370HVIR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1370HVIR#TRPBF?
All LT1370HVIR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1370HVIR#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 LT1370HVIR#TRPBF part is unused and in its original packaging.
Return procedure for LT1370HVIR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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