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Analog Devices Inc. LT1931ES5#TRMPBF
- Part No.:
- LT1931ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1931ES5#TRMPBF.pdf
- Description:
- IC REG CUK ADJ 1A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:11,524
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Product details
Overview
LT1931ES5#TRMPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode inverting DC/DC converter IC 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 and high power density in space-constrained bias supply applications such as CCD and LCD bias.
For engineers reviewing the LT1931ES5#TRMPBF datasheet, LT1931ES5#TRMPBF pinout, LT1931ES5#TRMPBF application, or LT1931ES5#TRMPBF equivalent, key selection criteria include its 1.2MHz switching frequency, –1.255V feedback reference, 400mV VCE(SAT) at 1A, ThinSOT-23 package compatibility, and suitability for low-noise negative rail generation in imaging and display systems.
Technical Context
The LT1931ES5#TRMPBF employs constant-frequency current-mode control with an internal 1.2MHz oscillator, enabling precise regulation and fast transient response. Its dual-inductor inverting architecture filters both input and output currents, achieving ≤1mVP-P output ripple with ceramic capacitors.
It integrates a 36V-rated switch with 400mV saturation voltage at 1A and features a –1.255V precision feedback reference referenced to output. The NFB pin sources bias current, requiring external resistive divider design per VOUT = –1.255 × (1 + R1/R2), and supports optional phase-lead compensation via capacitor across R1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2MHz - enables use of compact <2mm-height inductors and low-ESR ceramic capacitors |
| Output Voltage Ripple | ≤1mVP-P - achieved with X5R/X7R ceramic output caps; critical for MR head and CCD bias stability |
| Feedback Reference | –1.255V - precise, temperature-stable reference for accurate negative output regulation |
| Switch VCE(SAT) | 400mV at 1A - minimizes conduction loss and thermal rise in high-current inverting topologies |
| Input Voltage Range | 2.6V to 16V - supports wide-input industrial and battery-powered systems including 5V and 12V rails |
| Shutdown Current | <1µA - ensures negligible standby drain in portable or always-on bias supplies |
| Max Output Differential | 34V (VIN–VOUT) - allows generation of –33V/–66V SLIC supplies from 12V input |
Pinout & Package
LT1931ES5#TRMPBF is housed in a 5-lead ThinSOT-23 (TSOT-23) package, 1mm profile, JEDEC MO-193 compliant, with exposed pad not connected internally. Pin 1 (SW) carries high di/dt switching current; Pin 2 (GND) must tie directly to local ground plane; Pin 3 (NFB) sources bias current and sets output voltage; Pin 4 (SHDN) is active-high enable; Pin 5 (VIN) requires local 1–4.7µF ceramic bypass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to coupled/uncoupled inductor(s) and Schottky diode cathode; minimize trace area to reduce EMI |
| GND (Pin 2) | Power ground | Primary return path for switch current and feedback loop; must connect directly to local ground plane |
| NFB (Pin 3) | Feedback input | Sources 4–8µA bias current; connects to resistor divider tap; sets VOUT = –1.255 × (1 + R1/R2) |
| SHDN (Pin 4) | Enable control | Logic-high ≥2.4V enables operation; logic-low ≤0.5V disables with <1µA quiescent draw |
| VIN (Pin 5) | Input supply | Accepts 2.6–16V; requires local 1–4.7µF X5R/X7R ceramic decoupling placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual-inductor inverting topology | Simultaneously filters input and output current ripple, enabling ultra-low noise (≤1mVP-P) negative rails |
| Integrated 1A, 36V switch | Eliminates external MOSFET; supports up to –12V@150mA from 5V or –33V@100mA from 12V with proper layout |
| Fixed 1.2MHz frequency | Ensures predictable EMI spectrum and eliminates low-frequency noise common in charge-pump solutions |
| Low 400mV VCE(SAT) | Reduces conduction loss and thermal stress under full load, improving efficiency in high-current bias applications |
| ThinSOT-23 footprint | 5-pin, 1mm height package enables high-density PCB layouts for portable imaging and display modules |
Applications
| Disk Drive MR Head Bias | Digital Camera CCD Bias |
|---|---|
Use Scenario: Precision analog bias for magnetoresistive read heads in HDDs requiring stable, low-noise negative voltage. IC Role / Device Role / Timing Role: Inverting DC/DC converter generating –5V rail with ≤1mVP-P ripple to minimize signal distortion and thermal drift. Use Value: Enables high-sensitivity data retrieval by maintaining head bias stability under dynamic load conditions without external filtering. |
Use Scenario: High-precision negative supply for CCD image sensors in DSLR and industrial cameras. IC Role / Device Role / Timing Role: Generates –5V or –12V from 5V system rail using dual-inductor topology to suppress switching noise coupling into analog pixel array. Use Value: Preserves CCD dynamic range and SNR by delivering ultra-low-noise bias unaffected by digital switching transients. |
| LCD Bias Supply | GaAs FET Bias |
Use Scenario: Compact negative voltage source for TFT-LCD source driver ICs requiring –5V to –10V rails. IC Role / Device Role / Timing Role: Inverting regulator operating at 1.2MHz to fit within tight board area constraints while meeting EMI Class B limits. Use Value: Reduces solution size by >40% vs. charge-pump alternatives and eliminates need for bulky LC filters. |
Use Scenario: Low-noise gate bias for GaAs FET RF amplifiers in telecom infrastructure and test equipment. IC Role / Device Role / Timing Role: Provides regulated –5V rail with fast load-step response (<1% deviation) to maintain amplifier linearity during burst-mode transmission. Use Value: Ensures consistent gain and intermodulation performance by sustaining stable bias under pulsed RF loads. |
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 |
|---|---|---|---|
| LT1931AES5#TRMPBF | 2.2MHz switching frequency, 75% max duty cycle, 300mA max –5V output | Better suited for ultra-compact designs using sub-5mm inductors; lower efficiency at high load | Select when board area and component height are primary constraints over peak output current |
| LT1611ES5#TRMPBF | 1.4MHz, 150mA –5V output, no integrated 1A switch (external FET required) | Lower power, legacy solution; lacks dual-inductor noise suppression and 1A integration | Choose only for cost-sensitive, low-current upgrades where existing LT1611 layout reuse is mandatory |
Compared with LT1931AES5#TRMPBF and LT1611ES5#TRMPBF, the LT1931ES5#TRMPBF delivers 2.3× higher –5V output current than LT1611 and 16% more than LT1931A, while maintaining superior noise performance due to its dedicated dual-inductor architecture and lower VCE(SAT).
Availability
LT1931ES5#TRMPBF is available at Aetrix Electronics and suitable for disk drive MR head bias, digital camera CCD bias, and LCD panel bias applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over –40°C to 85°C.
Supply support for LT1931ES5#TRMPBF 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, manufacturing, and documentation for the LT1931 family. Linear was renowned for high-performance analog and power management ICs.
The LT1931 series was designed specifically for high-power-density, low-noise negative voltage generation in imaging, display, and telecom bias applications-emphasizing integration, ripple suppression, and SOT-23 scalability.
FAQ
What is the maximum output current capability of the LT1931ES5#TRMPBF?
The LT1931ES5#TRMPBF delivers –5V at up to 350mA or –12V at up to 150mA from a 5V input, as verified in the datasheet's Typical Performance Characteristics (Figure 1931 TA01 and TA02). This performance assumes proper thermal layout, recommended coupled inductors (e.g., Sumida CLS62-100), and X5R ceramic output capacitors. Derating applies above 70°C ambient.
Does the LT1931ES5#TRMPBF require external compensation components?
The LT1931ES5#TRMPBF operates stably with standard resistor-divider feedback but supports optional phase-lead compensation via a capacitor (e.g., 220pF) across R1 to improve transient response and phase margin. Figure 1 and Figure 4 in the datasheet confirm this configuration reduces ringing during load steps without mandatory external compensation for basic –5V/–12V designs.
Can the LT1931ES5#TRMPBF generate –33V output?
Yes-the LT1931ES5#TRMPBF supports up to 34V differential between VIN and VOUT. As shown in Typical Application TA08, it generates –33V at 100mA and –66V at 48mA from a 12V input using appropriate inductor (Sumida CR43-220) and soft-start circuitry (RSS/CSS), with total output power limited to 3.3W.
What is the recommended diode for use with the LT1931ES5#TRMPBF?
The ON Semiconductor MBR0520 Schottky diode is explicitly recommended in the datasheet for ≤20V VIN–VOUT differentials. For higher differentials (e.g., >20V), the MBR0530 (30V rating) is advised. Both support the 0.5A average forward current typical in LT1931ES5#TRMPBF applications; Microsemi UPS5817 is suggested only if diode current exceeds 0.5A.
Is the LT1931ES5#TRMPBF pin-compatible with other ThinSOT-23 regulators?
Yes-the LT1931ES5#TRMPBF is pin-for-pin compatible with the LT1611, as stated in the datasheet's FEATURES section. This allows direct replacement in existing LT1611 designs to upgrade output current and noise performance without PCB changes, provided input voltage and thermal design accommodate the higher 1A switch capability.
LT1931ES5#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT1931ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1931ES5#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT1931ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1931ES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1931ES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1931ES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1931ES5#TRMPBF?
LT1931ES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1931ES5#TRMPBF 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#TRMPBF?
For technical support, including LT1931ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1931ES5#TRMPBF requirements.
6.How does Aetrix verify that LT1931ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1931ES5#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1931ES5#TRMPBF?
All LT1931ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1931ES5#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT1931ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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