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Analog Devices Inc. LT1370HVCR#TRPBF
- Part No.:
- LT1370HVCR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1370HVCR#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 6A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
LT1370HVCR#TRPBF 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 4.5mA quiescent current, 0.065Ω typical switch RDS(on), and operates down to 2.7V input - used in laptop supplies, dual-output flyback converters, and Li-ion battery-powered 5V SEPIC systems.
For engineers reviewing the LT1370HVCR#TRPBF datasheet, LT1370HVCR#TRPBF pinout, LT1370HVCR#TRPBF application, or LT1370HVCR#TRPBF equivalent, key selection criteria include its 42V switch breakdown voltage (HV variant), ±2.48V negative feedback reference, 600–800kHz synchronization range, shutdown current of 12µA, and compatibility with surface-mount 4.7µH inductors for compact high-efficiency designs.
Technical Context
The LT1370HVCR#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 features nonlinear transconductance (1100–1900 µmho) that increases 10× above 40mV FB overdrive to suppress startup/overload overshoot.
Oscillator frequency shifts 5:1 when FB drops below 0.6V, reducing stress during overload; the S/S pin serves dual functions - logic-level shutdown (threshold 0.6–2.0V) and external synchronization (600–800kHz guaranteed). The VC pin provides combined compensation, soft-start, and current-limit adjustment via external RC network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 460–550 kHz (typ. 500 kHz); enables use of small 4.7µH inductors and reduces EMI filter size. |
| Output Switch Breakdown Voltage | 42 V (HV variant); supports higher input/output voltage margins than standard LT1370 (35 V). |
| Integrated Power Switch Current Limit | 6 A (min), 10 A (max); protects against overload while delivering >2 A continuous output in boost/flyback. |
| Reference Voltage (FB) | 1.245 V (±1.2%); sets positive output voltage via resistor divider; low bias current (250–550 nA) minimizes divider error. |
| Negative Feedback Reference (NFB) | –2.48 V (±1.7%); enables direct regulation of negative outputs without external op-amps. |
| Quiescent Supply Current | 4.5 mA (typ.); maintains high light-load efficiency in battery-powered systems. |
| Shutdown Supply Current | 12 µA (typ.); allows ultra-low-power standby in portable equipment. |
| Minimum Input Voltage | 2.7 V (guaranteed); supports single Li-ion (2.7–4.2 V) and multi-cell alkaline inputs. |
Pinout & Package
LT1370HVCR#TRPBF 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 | Senses positive output voltage; referenced to 1.245 V internal bandgap; enables oscillator frequency shifting. |
| 3 - NFB | Negative Feedback Input | Senses negative output voltage; referenced to –2.48 V; includes 100 kΩ series source resistor. |
| 4 - S/S | Shutdown & Synchronization | Logic-level input: low = shutdown (12 µA IQ); 600–800 kHz AC signal = sync; internal 12 µs delay prevents false shutdown. |
| 5 - VIN | Input Supply Bypass | Requires ≥10 µF low-ESR capacitor; UVLO triggers below 2.5 V to halt switching and pull VC low. |
| 6 - VSW | Switch Collector Node | High-current node (6 A peak); requires short PCB traces to minimize EMI and voltage spikes. |
| 7 - GND | Power & Signal Ground | All ground pins must connect to low-impedance ground plane; shared return for switch, feedback, and bias paths. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode architecture | Enables inherent pulse-by-pulse current limiting, excellent line transient response, and simplified loop compensation across wide VIN/VOUT ranges. |
| Positive/negative output regulation | Single IC regulates both polarities: FB pin for +VOUT (1.245 V ref), NFB pin for –VOUT (–2.48 V ref), eliminating need for auxiliary amplifiers. |
| Nonlinear error amplifier transconductance | Transconductance jumps 10× when FB exceeds VREF by 40 mV, actively suppressing output overshoot during startup or load recovery. |
| 5:1 oscillator frequency shift | Reduces switching frequency under overload (FB < 0.6 V), lowering peak switch current and protecting external components. |
| External synchronization capability | S/S pin accepts 600–800 kHz logic-level signal, enabling noise-sensitive systems to align switching with master clock and reduce beat frequencies. |
| Low minimum supply voltage | Operates from 2.7 V input, supporting single-cell Li-ion (2.7–4.2 V) and multi-cell alkaline/battery systems without pre-regulation. |
Applications
| Laptop Computer Supplies | Dual-Output Flyback Supplies |
|---|---|
Use Scenario: Generating isolated +15 V and –15 V rails from 2.7–10 V input in portable computing power modules. IC Role / Device Role / Timing Role: Primary-side controller regulating both outputs simultaneously using FB and NFB pins; 500 kHz switching enables compact transformer design. Use Value: Eliminates need for separate regulators or post-regulators; 42 V HV rating accommodates input surges and ensures robust operation during battery transients. |
Use Scenario: Providing tightly regulated ±15 V outputs with overvoltage protection in industrial sensor interface modules. IC Role / Device Role / Timing Role: Dual-polarity feedback controller using FB and NFB pins to clamp either rail independently; frequency shift protects diodes/capacitors during overload. Use Value: Prevents unregulated voltage rise on lightly loaded rail; 6 A switch handles peak currents during dynamic load steps without external current sense. |
| Li-Ion to 5 V SEPIC Converters | Inverting Supplies |
Use Scenario: Stepping up/down from 4–9 V two-cell Li-ion input to stable 5 V output in handheld medical devices. IC Role / Device Role / Timing Role: SEPIC topology controller with integrated 6 A switch; VC pin enables soft-start to limit inrush into large output capacitors. Use Value: Maintains regulation even as battery discharges below 5 V; 4.5 mA quiescent current extends runtime in sleep modes. |
Use Scenario: Generating –5 V from 2.7–13 V input in analog front-end circuits requiring clean negative bias for op-amps and ADCs. IC Role / Device Role / Timing Role: Inverting regulator using NFB pin and external resistor divider; shutdown pin enables power gating during idle periods. Use Value: Delivers –5 V at >1.75 A with <1% line/load regulation; 12 µA shutdown current preserves battery life in always-on monitoring systems. |
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 FETs); supports wider VIN (4–36 V) and higher efficiency (>95%) but requires external MOSFETs and complex layout. | Used in high-power automotive/industrial DC/DC where efficiency >92% and input >15 V are critical; not suitable for cost-sensitive, space-constrained consumer designs. | Select LTC3780EFE#PBF only when efficiency >94% and input >15 V are mandatory; LT1370HVCR#TRPBF remains optimal for <10 W, <15 V input, and minimal BOM count. |
| LM5122MH/NOPB | Current-mode synchronous boost/buck-boost controller; 65 V max switch voltage, 100 kHz–1 MHz adjustable frequency, no integrated NFB capability for negative regulation. | Preferred for high-voltage boost (e.g., 12 V → 48 V PoE) but cannot directly regulate negative outputs without added op-amp circuitry. | Choose LM5122MH/NOPB for >36 V input or programmable frequency needs; LT1370HVCR#TRPBF is superior for dual-polarity, low-component-count designs below 42 V. |
Compared with LTC3780EFE#PBF and LM5122MH/NOPB, the LT1370HVCR#TRPBF uniquely integrates dual-polarity feedback, a 6 A switch, and 42 V rating in a 7-pin DD package - offering lowest component count and smallest footprint for sub-10 W bipolar or inverting supplies.
Availability
LT1370HVCR#TRPBF is available at Aetrix Electronics and suitable for laptop computer supplies, dual-output flyback converters, and Li-ion–powered SEPIC applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1370HVCR#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LT1370 family was designed as a high-frequency, high-current monolithic switching regulator platform targeting compact, efficient DC/DC conversion in portable and battery-operated systems - emphasizing integration, low IQ, and topology flexibility.
FAQ
What is the maximum input voltage rating for LT1370HVCR#TRPBF?
The LT1370HVCR#TRPBF has a 42 V maximum switch breakdown voltage (BVSW), confirmed in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1370 (35 V) and enables reliable operation with higher input transients or wider VIN ranges in industrial or automotive-adjacent applications. Always maintain ≥2 V margin between actual VSW stress and 42 V rating.
Can LT1370HVCR#TRPBF regulate negative output voltages without external op-amps?
Yes. The LT1370HVCR#TRPBF includes a dedicated NFB pin with a –2.48 V internal reference and integrated 100 kΩ source resistor, allowing direct negative output regulation using only an external resistor divider. This eliminates the need for external op-amps or level-shifters - a key differentiator versus most switching controllers.
What is the guaranteed synchronization frequency range for LT1370HVCR#TRPBF?
The LT1370HVCR#TRPBF guarantees synchronization between 600 kHz and 800 kHz on the S/S pin, per Electrical Characteristics table. While typical operation extends to 1.05–1.8× nominal frequency (≈525–900 kHz), only the 600–800 kHz band is production-tested and specified - critical for noise-sensitive timing-critical systems.
How does the LT1370HVCR#TRPBF reduce output overshoot during startup?
The LT1370HVCR#TRPBF uses nonlinear error amplifier transconductance: when FB exceeds VREF by 40 mV, gm increases 10× (from ~1500 to ~15,000 µmho), accelerating correction and limiting voltage excursion. This behavior is documented in the Applications Information section and verified in Typical Performance Characteristic G06.
What package type and thermal resistance does LT1370HVCR#TRPBF use?
The LT1370HVCR#TRPBF uses the 7-lead plastic DD (R) package with exposed thermal tab. With 0.5 in² copper area on the backside ground plane, its typical junction-to-ambient thermal resistance (θJA) is 30°C/W. Mounting technique significantly affects this value - values from 20°C/W to >40°C/W are possible depending on PCB layout and airflow.
LT1370HVCR#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
LT1370HVCR#TRPBF FAQ
1.How can I place an order for LT1370HVCR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1370HVCR#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 LT1370HVCR#TRPBF reliable?
The price and inventory of LT1370HVCR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1370HVCR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1370HVCR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1370HVCR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1370HVCR#TRPBF?
LT1370HVCR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1370HVCR#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 LT1370HVCR#TRPBF?
For technical support, including LT1370HVCR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1370HVCR#TRPBF requirements.
6.How does Aetrix verify that LT1370HVCR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1370HVCR#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 LT1370HVCR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1370HVCR#TRPBF?
All LT1370HVCR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1370HVCR#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 LT1370HVCR#TRPBF part is unused and in its original packaging.
Return procedure for LT1370HVCR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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