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Analog Devices Inc. LTC3713EG#TRPBF
- Part No.:
- LTC3713EG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3713EG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,908
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Product details
Overview
LTC3713EG#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, valley-current-mode synchronous buck DC/DC controller optimized for ultra-low-input-voltage operation down to 1.5V. It delivers regulated outputs from 0.8V up to 0.9×VIN using dual external 5V logic-level N-channel MOSFETs, eliminates the need for a current-sense resistor, and integrates a 1.4MHz boost regulator to generate its 5V INTVCC supply-enabling telecom card step-down (3.3V/2.5V/1.8V), DDR bus termination, and low-VIN synchronous buck applications.
For engineers reviewing the LTC3713EG#TRPBF datasheet, LTC3713EG#TRPBF pinout, LTC3713EG#TRPBF application, or LTC3713EG#TRPBF equivalent, key selection criteria include its 0.8V ±1% reference, adjustable current limit via VRNG/ITH, minimum on-time <100ns, forced continuous/discontinuous mode control via FCB, and integrated boost converter for self-powered gate drive-critical for stable low-VIN power delivery in space-constrained industrial and telecom systems.
Technical Context
The LTC3713EG#TRPBF implements a valley-current-mode control architecture that senses inductor current through the bottom MOSFET's RDS(ON), eliminating external sense resistors while maintaining cycle-by-cycle current limiting. Its one-shot timer sets tON based on ION current and VON voltage, enabling input- and output-voltage-compensated frequency stability across 1.5V–10V VIN2 and 4V–30V VIN1 ranges.
It integrates two independent regulation loops: a main buck controller with 0.8V reference, programmable soft-start, PGOOD monitoring, and overvoltage/undervoltage protection; and an internal 1.4MHz fixed-frequency boost converter regulating INTVCC to 5.0V ±6% using VFB2 feedback, supporting operation without external bias supplies-even at VIN2 = 1.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN2(MIN) | 1.5V - Enables direct operation from single-cell LiFePO₄ or 2-cell NiMH battery inputs without pre-regulation. |
| VFB1 Reference | 0.800V ±1% - Tight tolerance ensures ±12.5mV output voltage accuracy at 1.25V setting, critical for DDR/SSTL termination compliance. |
| tON(MIN) | <100ns - Supports high duty-cycle operation at low VIN/VOUT ratios (e.g., 1.8V→1.25V), preserving regulation margin. |
| fBOOST | 1.4MHz typical - High-frequency boost minimizes external inductor/capacitor size while delivering 5V/2A peak drive for TG/BG gates. |
| Max Sense Threshold | 153mV at VRNG = 1V - Sets precise current limit without sense resistor; scalable to 214mV when VRNG = INTVCC for higher-current designs. |
| Operating Temp | –40°C to +85°C - Fully specified performance across industrial temperature range, validated by design and correlation. |
| Shutdown Current | 15–30µA - Enables ultra-low-power standby in always-on telecom modules and embedded controllers. |
Pinout & Package
Package: 24-lead plastic SSOP (G package), 0.635mm pitch, 8.65mm × 3.90mm footprint, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (1) | Run enable & soft-start ramp | Capacitor-to-ground sets soft-start time (~3s/µF) and overcurrent latchoff delay; <0.8V forces shutdown. |
| VON (2) | On-time voltage input | Sets tON trip point (0.7V–2.4V clamped); tying to VOUT enables constant-frequency operation across VOUT changes. |
| PGOOD (3) | Open-drain power-good flag | Pulled low when VFB1 deviates >±7.5% from 0.8V-provides system-level fault signaling for downstream logic sequencing. |
| VRNG (4) | Sense voltage range select | 10× nominal sense voltage (50–200mV); sets current limit threshold scaling and foldback behavior. |
| FCB (5) | Forced continuous mode control | Tie to GND for continuous conduction (low-noise); tie to INTVCC for discontinuous mode (light-load efficiency). |
| ITH (6) | Error amplifier output & current threshold | 0–2.4V control voltage sets valley current limit; also serves as compensation node for loop stability. |
| SGND (7,11) | Signal ground reference | Separate low-noise ground for feedback, compensation, and error amplifier-must connect to PGND at single point. |
| ION (8) | On-time current input | Resistor from VIN to ION sets switching frequency; current source scales tON inversely with VIN for stable fSW. |
| VFB1 (9) | Buck output voltage feedback | Connects to resistive divider from VOUT; 0.8V reference enables precise regulation of 0.8V–(0.9×VIN) outputs. |
| SHDN (10) | Active-low boost enable | ≥1V enables boost converter; grounded disables INTVCC generation-useful for external bias or low-power states. |
| VFB2 (12) | Boost output voltage feedback | Resistive divider from INTVCC sets 1.23V reference; determines final INTVCC voltage (e.g., 5.0V = 1.23V × (1+R4/R3)). |
| SW2 (13) | Boost switch node | Connects to boost inductor/diode; high di/dt node requiring minimized trace area to reduce EMI. |
| PGND (14,19) | Power ground return | Low-impedance return path for bottom MOSFET source, CIN(–), CVCC(–); must be solid copper plane under IC. |
| VIN2 (15) | Boost converter input | Supplies boost stage; operates from 1.5V–10V-supports standalone low-VIN bias or auxiliary rail generation. |
| VIN1 (16) | Main buck input | Primary power input (4V–30V); requires RC filter (1Ω + 0.1µF) for noise suppression and EMI reduction. |
| INTVCC (17) | Internal 5V regulator output | Supplies TG/BG drivers and control circuitry; requires ≥4.7µF low-ESR capacitor to PGND for stability. |
| BG (18) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC; 1–2Ω pull-down/pull-up resistance enables fast switching. |
| SENSE– (20) | Negative current sense input | Typically connected to PGND; when used with MOSFET RDS(ON), connects to bottom MOSFET source. |
| SENSE+ (21) | Positive current sense input | Typically connected to SW1; when used with MOSFET RDS(ON), connects to bottom MOSFET drain. |
| SW1 (22) | Buck switch node | Connects to top/bottom MOSFET drains and inductor; swings from ~–0.4V to VIN-requires tight layout for shoot-through prevention. |
| TG (23) | Top gate driver output | Floating driver referenced to SW1; delivers INTVCC swing superimposed on SW1 voltage for N-MOSFET high-side drive. |
| BOOST (24) | Bootstrap capacitor positive terminal | Connects to (+) of bootstrap cap CB; swings from ~INTVCC–0.4V to VIN+INTVCC-critical for TG gate charge replenishment. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE operation | Uses bottom MOSFET RDS(ON) for current sensing-eliminates 2–5% efficiency loss and BOM cost of discrete sense resistor. |
| Integrated 1.4MHz boost converter | Generates 5V INTVCC from VIN2 ≥1.5V-removes need for external bias supply and simplifies multi-rail designs. |
| Valley current mode control | Enables stable high-frequency operation without slope compensation-supports >1MHz buck switching with inherent load-transient response. |
| Programmable soft-start & current limit | RUN/SS capacitor sets startup ramp; VRNG/ITH combination allows precise, temperature-stable current limit tuning across full load range. |
| Discontinuous/continuous mode selection | FCB pin selects light-load operation mode-discontinuous for max efficiency at <10% load, continuous for low-noise/EMI-critical applications. |
| Output overvoltage protection | PGOOD asserts low and M1 shuts off while M2 latches on during overvoltage-prevents damage to downstream 1.2V/1.5V logic rails. |
Applications
| Telecom Card Power Supply | DDR/SSTL Bus Termination |
|---|---|
Use Scenario: Generating 3.3V, 2.5V, or 1.8V from 3.3V–5V backplane supplies in compact telecom line cards with strict thermal and space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current (up to 10A) step-down conversion with no external sense resistor. Use Value: Achieves >92% efficiency at 6A/1.25V output while eliminating sense resistor losses and reducing component count by 2–3 parts per rail. | Use Scenario: Providing matched 1.25V/1.5V termination voltage for DDR2/DDR3 memory interfaces with tight ±1% tolerance and fast transient response. IC Role / Device Role / Timing Role: Precision-regulated buck controller delivering low-noise, low-ripple output with 0.8V ±1% reference and PGOOD monitoring. Use Value: Maintains VTT compliance during 0→6A load steps with <100mV undershoot/overshoot-verified in Figure 1 circuit with 1.8µH/540µF output filter. |
| Low-VIN Industrial Sensor Node | Synchronous Buck with Auxiliary Boost |
Use Scenario: Powering 3.3V microcontrollers and analog front-ends from single-cell 1.5V alkaline or 2.0V LiFePO₄ batteries in remote IoT sensor nodes. IC Role / Device Role / Timing Role: Ultra-low-VIN buck controller operating down to 1.5V input, paired with integrated boost to sustain 5V gate drive during battery discharge. Use Value: Extends usable battery life by enabling regulation down to 1.5V VIN2 while maintaining 90%+ efficiency at 1A load-no external boost IC required. | Use Scenario: Generating isolated 5V bias for gate drivers or op-amps in high-side switch circuits where primary rail is <5V (e.g., 3.3V system with 5V MOSFET gate requirement). IC Role / Device Role / Timing Role: Dual-function IC providing main buck regulation plus dedicated 1.4MHz boost converter for auxiliary 5V rail. Use Value: Delivers 5V/500mA auxiliary output with <100mV ripple using single inductor-replaces discrete boost IC and reduces board area by 35%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Wider VIN1 range (4V–38V), no integrated boost, requires external 5V bias; supports phase-shedding for multi-phase designs. | Best suited for higher-input industrial supplies (>12V) where external bias is available and multi-phase scalability is needed. | Select LTC3780EFE#PBF only when VIN1 >12V and system already provides clean 5V bias-avoid for low-VIN or battery-powered use cases. |
| MP2494D-LF-Z | Fixed 500kHz frequency, no valley current mode, no integrated boost, 2.5V–18V VIN range, smaller 10-pin MSOP package. | Targeted at cost-sensitive, medium-power (≤5A) applications where simplicity and footprint matter more than ultra-low-VIN operation. | Choose MP2494D-LF-Z for 3.3V–12V input designs needing minimal BOM count and lower unit cost-but not for <2.5V inputs or precision current limiting. |
Compared with LTC3780EFE#PBF and MP2494D-LF-Z, the LTC3713EG#TRPBF uniquely combines sub-2V input capability, integrated boost for self-biasing, and valley-current-mode control-making it the only viable option for battery-fed telecom and DDR termination where both low-VIN operation and gate-drive autonomy are mandatory.
Availability
LTC3713EG#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure power supplies, DDR memory termination networks, and low-VIN industrial sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature-grade performance.
Supply support for LTC3713EG#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 full technical and manufacturing continuity for all Linear power products.
The LTC3713EG#TRPBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for low-input-voltage, high-current DC/DC conversion in telecom, computing, and industrial systems where efficiency, integration, and reliability are critical.
FAQ
What is the minimum input voltage supported by the LTC3713EG#TRPBF for its boost converter section?
The LTC3713EG#TRPBF boost converter (VIN2 input) operates down to 1.5V minimum, enabling direct connection to single-cell LiFePO₄ or 2-cell NiMH batteries. This is confirmed in the Electrical Characteristics table under "VIN2(MIN)" with a guaranteed 1.5V specification over the full –40°C to +85°C temperature range. Below 1.5V, the boost regulator cannot sustain 5V INTVCC, causing gate drive failure.
Can the LTC3713EG#TRPBF operate without an external current-sense resistor?
Yes-the LTC3713EG#TRPBF is explicitly designed for No RSENSE operation using the bottom MOSFET's RDS(ON) as the current-sensing element. SENSE+ and SENSE– pins connect directly to the drain and source of the bottom MOSFET, eliminating sense resistor losses and BOM cost. The datasheet confirms this in the FEATURES section and Applications Information.
How is the switching frequency set on the LTC3713EG#TRPBF?
Switching frequency is set by the resistor (RON) from VIN1 to the ION pin, which controls the one-shot timer current. The on-time tON is calculated as tON = (10pF × VON)/ION, and frequency varies inversely with VIN1. For constant frequency across VIN1 changes, tie VON to VOUT. Frequency ranges from ~200kHz to >1MHz depending on RON and operating conditions.
What protection features does the LTC3713EG#TRPBF provide for output overvoltage events?
The LTC3713EG#TRPBF provides hardware-based output overvoltage protection: when VFB1 exceeds +7.5% of 0.8V (i.e., >0.86V), the PGOOD pin pulls low and the top MOSFET (M1) is immediately turned off while the bottom MOSFET (M2) is latched on until the fault clears. This action clamps the output and protects downstream 1.2V/1.5V logic-verified in the Functional Diagram and Operating Description.
Is the LTC3713EG#TRPBF pin-compatible with other members of the LTC37xx family?
No-the LTC3713EG#TRPBF has a unique 24-pin SSOP pinout optimized for its dual-regulator architecture (buck + integrated boost). It is not pin-compatible with LTC3714, LTC3716, or LTC3780. Pin mapping differs significantly in critical functions (e.g., SW2, VIN2, VFB2, BOOST), and substituting without PCB redesign will cause functional failure.
LTC3713EG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 1.5V ~ 36V
- Frequency - Switching:
- 1.4MHz
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3713EG#TRPBF FAQ
1.How can I place an order for LTC3713EG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3713EG#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 LTC3713EG#TRPBF reliable?
The price and inventory of LTC3713EG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3713EG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3713EG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3713EG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3713EG#TRPBF?
LTC3713EG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3713EG#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 LTC3713EG#TRPBF?
For technical support, including LTC3713EG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3713EG#TRPBF requirements.
6.How does Aetrix verify that LTC3713EG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3713EG#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 LTC3713EG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3713EG#TRPBF?
All LTC3713EG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3713EG#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 LTC3713EG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3713EG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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