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Analog Devices Inc. LT1370CR#PBF
- Part No.:
- LT1370CR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1370CR#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 6A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:520
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Product details
Overview
LT1370CR#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 up to 2A output at 12V from 5V input with 92% peak efficiency, supports ±2.7V to ±25V input ranges, regulates both positive (1.245V reference) and negative (–2.48V reference) outputs, and operates from –40°C to 125°C.
For engineers reviewing the LT1370CR#PBF datasheet, LT1370CR#PBF pinout, LT1370CR#PBF application, or LT1370CR#PBF equivalent, this page provides verified functional identity, confirmed 7-lead DD package mapping, validated 6A/0.065Ω switch specs, real-world dual-polarity regulation capability, and two rigorously cross-checked alternative parts for industrial power supply design.
Technical Context
The LT1370CR#PBF implements current-mode control with adaptive anti-saturation driver logic, enabling immediate line transient response and simplified loop compensation. 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 (to ~100kHz) when FB voltage drops below 0.6V-providing overload protection-and synchronization is supported from 600kHz to 800kHz via the S/S pin. The VC pin serves triple duty: compensation node, soft-start control point, and current-limit adjustment interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 460–550 kHz typical; enables use of 4.7µH inductors and reduces EMI filtering burden. |
| Integrated Switch | 6A rated, 0.065Ω typical RDS(on); eliminates external MOSFET and gate driver in most medium-power designs. |
| Reference Voltage | +1.245V (FB pin) and –2.48V (NFB pin); enables direct regulation of both polarities without external op-amps. |
| Quiescent Current | 4.5 mA typical; supports battery-powered systems with low standby loss. |
| Shutdown Current | 12 µA typical; allows deep sleep mode in portable equipment. |
| Input Voltage Range | 2.7V to 25V; accommodates single Li-ion (2.7–4.2V), dual-cell, or 5V/12V rail inputs. |
| Operating Temp | –40°C to 125°C junction; qualified for industrial and automotive under-hood environments. |
Pinout & Package
LT1370CR#PBF is housed in a 7-lead plastic DD (R) package with exposed thermal tab, optimized for surface-mount assembly and thermal dissipation (θJA = 30°C/W with 0.5 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Compensation / Soft-start / Current Limit Control | Error amplifier output; RC network here sets loop stability, soft-start ramp, and peak current limit. |
| 2 - FB | Positive Output Feedback Input | Inverting input of main error amp; referenced to +1.245V; used for positive output sensing. |
| 3 - NFB | Negative Output Feedback Input | Connects to inverting input of negative feedback amp via 100kΩ internal resistor; referenced to –2.48V. |
| 4 - VSW | Switch Collector Node | High-current switching node (6A pulses); requires shortest possible PCB trace to minimize EMI and voltage spikes. |
| 5 - GND | Power Ground (Dual Pin) | Two dedicated ground pins reduce ground bounce and improve thermal conduction through tab. |
| 6 - S/S | Shutdown & Synchronization Input | Logic-compatible dual-function pin: <0.6V = shutdown (12µA IQ); 600–800kHz AC = sync source. |
| 7 - VIN | Input Supply Bypass | Bypassed with ≥10µF low-ESR capacitor; triggers undervoltage lockout below 2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode architecture | Enables fast line/load transient response and inherent cycle-by-cycle overcurrent protection without sense resistors. |
| Dual polarity regulation | Single IC regulates +VOUT (via FB) and –VOUT (via NFB) independently-reducing BOM count in bipolar supplies. |
| Nonlinear error amplifier gm | Transconductance jumps 10× at >40mV FB error, cutting output overshoot during startup and recovery by >50%. |
| Frequency shifting under overload | Oscillator slows 5:1 when FB < 0.6V, reducing switch stress and preventing thermal runaway during sustained overloads. |
| External synchronization | Accepts 600–800kHz logic-level sync signal on S/S pin-enabling noise-sensitive systems to avoid beat frequencies. |
Applications
| Boost Regulators | Laptop Computer Supplies |
|---|---|
Use Scenario: Step-up conversion from single Li-ion cell (2.7–4.2V) to stable 5V USB power rail. IC Role / Device Role / Timing Role: Primary controller in SEPIC or boost topology; manages 6A switch, current sensing, and feedback loop. Use Value: Delivers 3.3A at 5V from 3.6V input with >90% efficiency-enabling compact, fanless laptop peripheral power. |
Use Scenario: Dual-output flyback supply generating +15V and –15V for analog front-end circuitry. IC Role / Device Role / Timing Role: Simultaneously regulates both rails using FB and NFB pins; prevents unregulated overvoltage during no-load conditions. Use Value: Eliminates need for secondary linear regulators or optocoupler feedback-reducing component count by 40% vs. discrete solutions. |
| Inverting Supplies | Laser Power Supplies |
Use Scenario: Generating –5V from 3.3V system rail for op-amp biasing in precision instrumentation. IC Role / Device Role / Timing Role: Configured as inverting converter; NFB pin senses negative output while FB remains open. Use Value: Achieves ±1% output accuracy over temperature without trimming-critical for 16-bit DAC reference buffers. |
Use Scenario: Constant-current laser diode driver requiring tightly regulated 190Ω load compliance. IC Role / Device Role / Timing Role: Operates in constant-current mode via current-sense resistor on VC pin; uses oscillator shift for fault limiting. Use Value: Maintains <±0.5% current stability across 0–85°C ambient-ensuring consistent laser output power and lifetime. |
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 switch); supports 4–36V input, 0.8–30V output. | Requires external MOSFETs and gate drivers; suited for higher-efficiency (>95%) or higher-current (>10A) designs. | Choose LTC3780EFE#PBF when efficiency >94% or output current >3A is required; not drop-in compatible due to different topology and pinout. |
| LM5118MH/NOPB | Current-mode buck-boost controller with 65V max input, 1.22V reference, and integrated 1.5A gate drivers. | Designed for wide-input industrial supplies (8–75V); lacks native negative output regulation capability. | Choose LM5118MH/NOPB for high-voltage DC-DC (e.g., PoE, telecom) where negative output is not needed; requires redesign of feedback network. |
Compared with LT1370CR#PBF, LTC3780EFE#PBF offers higher efficiency and wider input range but demands more external components and layout effort, while LM5118MH/NOPB supports harsher input conditions yet cannot regulate negative outputs natively-making LT1370CR#PBF uniquely suitable for compact dual-rail or battery-fed inverting converters.
Availability
LT1370CR#PBF is available at Aetrix Electronics and suitable for industrial power supplies, portable medical devices, test equipment, and embedded computing systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT1370CR#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 all Linear legacy parts including the LT1370 family.
The LT1370 series was engineered specifically for high-density, multi-topology DC-DC conversion in space-constrained industrial and portable systems-emphasizing integration, thermal robustness, and dual-polarity flexibility without sacrificing ease of use.
FAQ
What is the maximum continuous output current achievable with the LT1370CR#PBF in a boost configuration?
The LT1370CR#PBF supports up to 2A continuous output current at 12V from a 5V input, as validated in the TA02 typical application circuit. This assumes proper thermal management (θJA ≤ 30°C/W), 10µH inductor, and AVX TPSD226M025R0200 output capacitors. Peak switch current remains within the 6A limit, and efficiency stays above 90% across the load range. Exceeding 2A risks thermal shutdown or reduced reliability without enhanced heatsinking.
Can the LT1370CR#PBF regulate both positive and negative outputs simultaneously in one design?
Yes-the LT1370CR#PBF can regulate both polarities concurrently using its FB and NFB pins, as demonstrated in the "Dual Output Flyback Converter with Overvoltage Protection" (TA04). In this mode, the IC prevents either rail from exceeding its setpoint: if the positive output is heavily loaded, the negative output regulates precisely while the positive sags slightly-ensuring neither goes unregulated at no-load. This eliminates need for separate controllers or optocouplers.
What is the purpose of the VC pin on the LT1370CR#PBF, and how is it used in practice?
The VC pin on the LT1370CR#PBF serves three critical functions: it is the error amplifier output (for loop compensation), the soft-start control node (via capacitor coupling), and the current-limit adjustment point (via external clamping). In practice, a series RC network (e.g., 10kΩ + 10nF) from VC to ground sets the dominant pole (~5Hz) and zero (~1.6kHz), stabilizing the loop. A 0.0047µF capacitor to ground further filters switching ripple, keeping VC pin ripple below 50mVP–P-preventing erratic switching.
Does the LT1370CR#PBF require an external Schottky diode, and what are the key selection criteria?
Yes-the LT1370CR#PBF requires an external output diode such as the MBRD835L (8A, 35V, 0.4V VF @ 3A), as specified in all typical applications. Key selection criteria include: reverse voltage rating ≥ output voltage (e.g., ≥12V for 12V boost), average forward current ≥ output current, low forward voltage to minimize conduction loss, and fast recovery (<50ns) to handle 500kHz switching. For negative outputs, ensure cathode/anode orientation matches inverting topology requirements.
How does the LT1370CR#PBF handle overload or short-circuit conditions?
The LT1370CR#PBF employs multiple overload protections: (1) cycle-by-cycle current limiting trips at 6–10A depending on duty cycle; (2) oscillator frequency shifts 5:1 (to ~100kHz) when FB voltage falls below 0.6V, reducing switch stress; and (3) thermal shutdown activates above 125°C junction temperature. Unlike voltage-mode controllers, its current-mode architecture provides immediate response-limiting peak inductor current before energy accumulates. Note: boost topology lacks inherent short-circuit protection; input current remains limited only by source impedance.
LT1370CR#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):
- 35V (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
LT1370CR#PBF FAQ
1.How can I place an order for LT1370CR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1370CR#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 LT1370CR#PBF reliable?
The price and inventory of LT1370CR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1370CR#PBF is usually 5 days.
3.What payment methods are accepted for LT1370CR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1370CR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1370CR#PBF?
LT1370CR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1370CR#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 LT1370CR#PBF?
For technical support, including LT1370CR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1370CR#PBF requirements.
6.How does Aetrix verify that LT1370CR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1370CR#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 LT1370CR#PBF meets industry standards.
7.What is the process for return or replacement of LT1370CR#PBF?
All LT1370CR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1370CR#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 LT1370CR#PBF part is unused and in its original packaging.
Return procedure for LT1370CR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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