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Analog Devices Inc. LT1931ES5#TRPBF
- Part No.:
- LT1931ES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1931ES5#TRPBF.pdf
- Description:
- IC REG CUK ADJ 1A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,329
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Product details
Overview
LT1931ES5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode inverting DC/DC converter with integrated 1A switch, operating at 1.2MHz to generate –5V at 350mA or –12V at 150mA from a 5V input. It uses a dual-inductor inverting topology for ultra-low noise (1mVP-P ripple), wide 2.6V–16V input range, and low 400mV VCE(SAT) at 1A-ideal for compact negative bias supplies in imaging and display systems.
For engineers reviewing the LT1931ES5#TRPBF datasheet, LT1931ES5#TRPBF pinout, LT1931ES5#TRPBF application, or LT1931ES5#TRPBF equivalent, key selection criteria include switching frequency (1.2MHz), feedback reference (–1.255V), shutdown current (<1µA), maximum duty cycle (84%), and ThinSOT-23 package compatibility with LT1611-based designs.
Technical Context
The LT1931ES5#TRPBF implements constant-frequency current-mode control with an internal 1.2MHz oscillator, SR latch, and PWM comparator referenced to a –1.255V feedback node. Its dual-inductor inverting topology filters both input and output currents, enabling stable regulation within 1% during large load transients.
It features a 36V-rated switch, allowing up to 34V VIN-to-VOUT differential, and integrates protection via 1.2A current limiting (guaranteed by design). The NFB pin sources bias current, requiring external resistive divider configuration per output voltage, while SHDN enables <1µA shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2MHz - enables use of sub-2mm-height inductors and ceramic capacitors for space-constrained designs |
| Output Ripple | 1mVP-P - achieved with ceramic output caps; supports low-noise analog biasing (e.g., CCD, MR head) |
| Feedback Voltage | –1.255V - precise reference for accurate negative output regulation across temperature |
| Max Output Current | 350mA at –5V from 5V - sufficient for LCD bias, GaAs FET gate drive, and local negative rails |
| VCE(SAT) | 400mV at 1A - minimizes conduction loss and thermal rise in high-current inverting topologies |
| Input Voltage Range | 2.6V to 16V - supports single-cell Li-ion, USB, and industrial 5V/12V supply rails |
| Shutdown Current | <1µA - enables battery-backed systems to maintain ultra-low quiescent power |
Pinout & Package
The LT1931ES5#TRPBF is housed in a 5-lead ThinSOT-23 (TSOT-23) package, 1mm profile, JEDEC MO-193 compliant, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to coupled/uncoupled inductor(s) and Schottky diode cathode; high dv/dt node requiring minimal trace area |
| GND (Pin 2) | Power ground | Must tie directly to local ground plane; serves as return for switch, feedback amplifier, and bias circuits |
| NFB (Pin 3) | Feedback input | Sources 4–8µA bias current; connects to resistor divider tap to set output voltage via –1.255V reference |
| SHDN (Pin 4) | Enable control | Logic-high ≥2.4V enables operation; logic-low ≤0.5V places device in sub-1µA shutdown state |
| VIN (Pin 5) | Input supply | Accepts 2.6–16V; requires local 1–4.7µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual-inductor inverting topology | Simultaneously filters input and output current ripple, reducing EMI and enabling clean negative rail generation |
| 1.2MHz fixed-frequency operation | Permits use of small, low-cost 10µH coupled inductors (e.g., Sumida CLS62-100) and X5R ceramic capacitors |
| Integrated 1A switch with 400mV VCE(SAT) | Eliminates external MOSFET; delivers high efficiency at 350mA without heatsinking in ThinSOT-23 |
| –1.255V precision feedback reference | Enables accurate, temperature-stable output regulation without trimming; supports ±1% output tolerance |
| Low 1µA shutdown current | Extends battery life in portable instrumentation and always-on sensor bias applications |
Applications
| Disk Drive MR Head Bias | Digital Camera CCD Bias |
|---|---|
Use Scenario: Generating stable –5V to –12V bias for magnetoresistive read heads in HDD preamplifiers. IC Role / Device Role / Timing Role: Inverting DC/DC converter providing low-noise, regulated negative supply independent of main system rail. Use Value: 1mVP-P ripple ensures minimal signal corruption in high-sensitivity analog front-ends. | Use Scenario: Supplying –5V bias to CCD image sensors in DSLR and industrial cameras. IC Role / Device Role / Timing Role: Compact, high-efficiency inverter delivering precise negative voltage with fast transient response. Use Value: Dual-inductor topology maintains output regulation within 1% during pixel readout current spikes. |
| LCD Bias Supply | GaAs FET Bias |
Use Scenario: Providing –10V to –15V gate bias for active-matrix LCD source drivers. IC Role / Device Role / Timing Role: Standalone negative rail generator with wide input range (2.6–16V) for flexible system integration. Use Value: 84% max duty cycle supports –12V output from 5V input without discontinuous mode penalties. | Use Scenario: Delivering –5V gate bias to GaAs FET RF amplifiers in wireless infrastructure modules. IC Role / Device Role / Timing Role: Low-EMI inverting regulator with 36V switch rating for high VIN–VOUT differential operation. Use Value: 34V differential capability allows direct use from 12V intermediate bus to –22V bias rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1611ES5#TRPBF | 1.4MHz switching, 150mA max output at –5V, no dual-inductor topology | Lower power, higher ripple; lacks LT1931ES5#TRPBF's 350mA capability and ultra-low noise performance | Select when cost-sensitive, lower-current bias is acceptable and board space permits larger filter components |
| LT1930ES5#TRPBF | Buck topology (positive output), 450mA at 5V from 3.3V input; same package and pinout but non-inverting | Cannot replace LT1931ES5#TRPBF in negative-rail applications; functionally distinct architecture | Choose only for positive-output requirements; not a functional substitute for inverting use cases |
Compared with LT1611ES5#TRPBF, LT1931ES5#TRPBF delivers >2× output current and 70% lower ripple using identical footprint; versus LT1930ES5#TRPBF, it provides complementary functionality-negative vs. positive regulation-with no shared application overlap.
Availability
LT1931ES5#TRPBF is available at Aetrix Electronics and suitable for disk drive MR head bias, digital camera CCD bias, LCD panel gate driver supplies, GaAs FET RF bias, and local low-noise negative supply applications requiring stable component supply across production lifecycles.
Supply support for LT1931ES5#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 high-performance power management portfolio, emphasizing precision, efficiency, and miniaturization for demanding analog and mixed-signal systems.
The LT1931 series belongs to Linear's ThinSOT inverting DC/DC converter product line, designed specifically for space-constrained, low-noise negative voltage generation in imaging, display, and RF bias applications.
FAQ
What is the switching frequency of the LT1931ES5#TRPBF?
The LT1931ES5#TRPBF operates at a fixed 1.2MHz switching frequency. This high frequency enables the use of miniature surface-mount inductors (e.g., 10µH coupled types) and low-ESR ceramic capacitors, minimizing solution size and cost. Unlike the LT1931A variant, the LT1931ES5#TRPBF does not support 2.2MHz operation-its frequency is factory-trimmed and non-adjustable.
Can the LT1931ES5#TRPBF generate –12V from a 5V input?
Yes, the LT1931ES5#TRPBF can deliver –12V at 150mA from a 5V input, as confirmed in the datasheet's typical application circuits and electrical characteristics. This capability relies on its 84% maximum duty cycle and 36V-rated internal switch, which supports up to 34V VIN-to-VOUT differential. Proper selection of feedback resistors (e.g., R1 = 84.5kΩ, R2 = 10kΩ) and low-DCR inductors (e.g., Sumida CLS62-100) is required.
What package type does the LT1931ES5#TRPBF use?
The LT1931ES5#TRPBF uses the 5-lead ThinSOT-23 (TSOT-23) package, measuring 2.9mm × 1.6mm × 1.0mm max height. It is RoHS-compliant, lead-free (#PBF suffix), supplied in tape-and-reel (#TRPBF), and JEDEC MO-193 registered. Pin 1 is SW, Pin 2 is GND, Pin 3 is NFB, Pin 4 is SHDN, and Pin 5 is VIN-identical pinout to LT1611 for drop-in replacement.
Does the LT1931ES5#TRPBF require external compensation?
The LT1931ES5#TRPBF is internally compensated for standard dual-inductor inverting configurations but supports optional phase-lead compensation via capacitor C4 (e.g., 220pF) across R1 in the feedback divider. This improves phase margin and damps output voltage overshoot during load transients, as demonstrated in Figures 3–4 of the datasheet. No compensation is needed for basic operation with ceramic output capacitors.
What is the maximum input voltage rating for the LT1931ES5#TRPBF?
The absolute maximum input voltage for the LT1931ES5#TRPBF is 16V, with recommended operating range from 2.6V to 16V. Its 36V-rated internal switch allows VIN–VOUT differentials up to 34V, enabling robust operation even when generating deeply negative outputs (e.g., –12V from 5V or –33V from 12V). Exceeding 16V on VIN risks permanent damage per Absolute Maximum Ratings.
LT1931ES5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Cuk
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.45V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- -1.255V
- Voltage - Output (Max):
- -34V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1931ES5#TRPBF FAQ
1.How can I place an order for LT1931ES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1931ES5#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 LT1931ES5#TRPBF reliable?
The price and inventory of LT1931ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1931ES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1931ES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1931ES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1931ES5#TRPBF?
LT1931ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1931ES5#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 LT1931ES5#TRPBF?
For technical support, including LT1931ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1931ES5#TRPBF requirements.
6.How does Aetrix verify that LT1931ES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1931ES5#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 LT1931ES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1931ES5#TRPBF?
All LT1931ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1931ES5#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 LT1931ES5#TRPBF part is unused and in its original packaging.
Return procedure for LT1931ES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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