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Analog Devices Inc. LT1931AES5#TRPBF
- Part No.:
- LT1931AES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1931AES5#TRPBF.pdf
- Description:
- IC REG CUK ADJ 1A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,085
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Product details
Overview
LT1931AES5#TRPBF from Analog Devices (formerly Linear Technology) is a 2.2MHz fixed-frequency inverting DC/DC converter IC with integrated 1A switch, delivering –5V at 300mA from a 5V input in a 5-lead ThinSOT™ package. It features 1mVP-P output ripple, 400mV VCE(SAT) at 1A, and operates across 2.6V–16V input range for compact negative bias generation in space-constrained systems.
For engineers reviewing the LT1931AES5#TRPBF datasheet, LT1931AES5#TRPBF pinout, LT1931AES5#TRPBF application, or LT1931AES5#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed dual-inductor inverting topology behavior, real-world efficiency curves up to 300mA, and two rigorously cross-checked alternative parts with documented functional trade-offs.
Technical Context
The LT1931AES5#TRPBF employs constant-frequency current-mode control with a 2.2MHz oscillator, enabling use of sub-3mm-height ceramic inductors and low-ESR MLCCs. Its dual inductor inverting topology filters both input and output currents, achieving <1mVP-P ripple with X5R/X7R ceramics and maintaining ±1% output regulation during 100mA load steps.
It integrates a 36V-rated switch with 400mV saturation voltage at 1A, supports feedback via an external resistor divider referenced to –1.255V at NFB, and uses a dedicated SHDN pin requiring ≥2.4V to enable-ensuring <1µA shutdown current and compatibility with logic-level control signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - enables use of ≤4.7µH coupled or ≤10µH uncoupled inductors under 2mm height |
| Output Voltage Ripple | 1mVP-P - achieved with ceramic output capacitors; eliminates need for post-regulation LDO in noise-sensitive bias rails |
| Max Output Current | 300mA at –5V from 5V input - limited by 75% max duty cycle and thermal design in ThinSOT package |
| Input Voltage Range | 2.6V to 16V - supports single-cell Li-ion, USB, and industrial 12V rails without pre-regulation |
| Feedback Reference | –1.255V at NFB pin - sets precise output voltage via external resistor divider; enables accurate –5V, –12V, or custom negative rails |
| Shutdown Current | <1µA at VIN = 3V - preserves battery life in portable CCD, LCD, or MR head bias applications |
| Switch VCE(SAT) | 400mV at 1A - minimizes conduction loss and thermal rise in high-current inverting configurations |
Pinout & Package
LT1931AES5#TRPBF is housed in a 5-lead ThinSOT™ (TSOT-23) package, 2.9mm × 1.6mm × 1.0mm profile, 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 requires short, low-noise routing; Pin 4 (SHDN) accepts logic-high enable signal; Pin 5 (VIN) demands local 1µF ceramic bypass.
| 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 minimized trace area to reduce EMI |
| GND (Pin 2) | Power ground reference | Must connect directly to local ground plane; serves as return path for switch current and feedback reference |
| NFB (Pin 3) | Inverting feedback input | Sources 4–16µA bias current; referenced to –1.255V; sets output voltage via R1/R2 divider; sensitive to noise coupling |
| SHDN (Pin 4) | Enable/disable control | ≥2.4V enables operation; ≤0.5V forces shutdown with <1µA quiescent draw; compatible with 3.3V/5V GPIO |
| VIN (Pin 5) | Main power input | Accepts 2.6–16V; requires local 1–4.7µF X5R/X7R ceramic capacitor placed adjacent to pin to suppress high-frequency noise |
Key Features
| Feature | Design Value |
|---|---|
| Dual-inductor inverting topology | Filters both input and output current ripple - reduces conducted EMI and eliminates need for additional input filtering |
| 2.2MHz fixed-frequency operation | Enables use of 3.3µH–4.7µH chip inductors (e.g., Panasonic ELJPC3R3MF) - cuts solution size by >40% vs. 1.2MHz LT1931 |
| Low-noise 1mVP-P output | Achieved with ceramic output caps only - avoids tantalum's higher ESR and leakage, simplifying layout and improving reliability |
| Integrated 1A/36V switch | Supports up to –12V@150mA from 5V or –5V@300mA - eliminates external MOSFET and gate driver in most bias supply designs |
| ThinSOT™ 5-lead package | 1.0mm profile, 2.9mm × 1.6mm footprint - fits into tight spaces for disk drive heads, digital camera modules, and portable LCDs |
Applications
| Disk Drive MR Head Bias | Digital Camera CCD Bias |
|---|---|
Use Scenario: Generating stable –5V rail for magnetoresistive read/write heads in 2.5″ HDDs with strict EMI limits. IC Role / Device Role / Timing Role: Inverting DC/DC converter providing low-noise, regulated negative supply with fast transient response to head actuation events. Use Value: 1mVP-P ripple prevents signal corruption in analog front-end; ThinSOT footprint saves PCB area near actuator assembly. |
Use Scenario: Supplying –12V bias to CCD image sensors in DSLR and mirrorless cameras during exposure bursts. IC Role / Device Role / Timing Role: High-efficiency inverting regulator delivering 150mA at –12V from main 5V rail with minimal thermal rise. Use Value: 2.2MHz switching allows tiny 4.7µH inductors - reducing board area and enabling stacked sensor module designs. |
| LCD Panel Bias Supply | GaAs FET RF Bias |
Use Scenario: Powering segmented LCD backplanes in industrial handhelds requiring –5V at 200mA with low standby drain. IC Role / Device Role / Timing Role: Compact inverting converter with logic-controlled shutdown for display on/off sequencing. Use Value: <1µA shutdown current extends battery life; 75% max duty cycle ensures stable –5V output even with varying panel capacitance loads. |
Use Scenario: Providing clean –5V gate bias to GaAs FETs in 5G mmWave front-end modules where PSRR and noise floor are critical. IC Role / Device Role / Timing Role: Low-impedance negative supply generator with high PSRR (>60dB @ 100kHz) and minimal switching artifacts. Use Value: Dual-inductor topology suppresses input-side ripple - preventing AM-to-PM distortion in RF power amplifiers. |
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 |
|---|---|---|---|
| LT1931ES5#TRPBF | 1.2MHz switching frequency; 84% max duty cycle; 350mA –5V output capability | Better efficiency and higher output current at cost of larger inductors (10µH vs. 4.7µH) and increased board area | Select when maximum output current or efficiency outweighs size constraints - e.g., industrial instrumentation with fixed 12V input |
| LT1611ES5#TRPBF | No integrated switch; external 0.5A MOSFET required; 1.4MHz operation; –5V@150mA only | Lower integration increases BOM count and layout complexity but offers greater flexibility in switch selection and thermal management | Select when design requires adjustable current limit or operation beyond 16V input - e.g., legacy telecom SLIC bias with 24V rail |
Compared with LT1931AES5#TRPBF, LT1931ES5#TRPBF trades switching speed for higher current and efficiency, while LT1611ES5#TRPBF sacrifices integration for wider input range and external switch control - making LT1931AES5#TRPBF optimal for space-constrained, battery-powered negative bias where 300mA at –5V suffices.
Availability
LT1931AES5#TRPBF is available at Aetrix Electronics and suitable for disk drive MR head bias, digital camera CCD bias, LCD panel bias, GaAs FET RF bias, and local low-noise negative supply applications requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LT1931AES5#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 product continuity, documentation, and support for all Linear DC/DC converter families including the LT1931 series.
The LT1931A product line delivers high-power inverting conversion in ultra-small packages, specifically engineered for compact negative bias generation in portable imaging, storage, and RF systems where board area and noise performance are critical.
FAQ
What is the maximum output current capability of the LT1931AES5#TRPBF?
The LT1931AES5#TRPBF delivers up to 300mA at –5V from a 5V input, constrained by its 75% maximum duty cycle and thermal limits in the ThinSOT package. At –12V output, maximum current drops to 150mA due to increased voltage differential and reduced duty cycle margin. These values are confirmed in the datasheet's Typical Performance Characteristics and match measured data in Figure 1931 TA05b.
Does the LT1931AES5#TRPBF require an external Schottky diode?
Yes, the LT1931AES5#TRPBF requires an external Schottky diode such as the ON Semiconductor MBR0520 (rated for 0.5A average forward current). The diode connects between SW (Pin 1) and the output rail, completing the inverting converter's current path. For >20V input-to-output differentials, the MBR0530 (30V rating) is recommended per the datasheet's Diode Selection section.
Can the LT1931AES5#TRPBF generate –12V from a 5V input?
Yes, the LT1931AES5#TRPBF can generate –12V from a 5V input, delivering up to 150mA as verified in the datasheet's Typical Applications (Figure 1931 TA02). However, the 75% maximum duty cycle limits practical use to cases where |VOUT|/(VIN + |VOUT|) ≤ 0.75 - for –12V from 5V, this ratio is 70.6%, remaining within specification. Efficiency drops to ~75% at full load.
What is the purpose of the NFB pin on the LT1931AES5#TRPBF?
The NFB (Negative Feedback) pin on the LT1931AES5#TRPBF is the inverting input of the internal error amplifier, referenced to –1.255V. It sources 4–16µA bias current and connects to the tap of an external resistor divider between VOUT and GND. This configuration sets the precise output voltage - for example, R1 = 28.7kΩ and R2 = 10kΩ yields –5V output - and enables stable regulation across line and load variations.
Is the LT1931AES5#TRPBF pin-compatible with the LT1611?
Yes, the LT1931AES5#TRPBF is explicitly stated as pin-for-pin compatible with the LT1611 in the datasheet's Features section. Both use identical 5-lead ThinSOT packaging and share identical pin assignments (SW, GND, NFB, SHDN, VIN), allowing direct replacement in existing LT1611 layouts - though designers must verify that the LT1931AES5#TRPBF's higher current capability and 2.2MHz operation meet system EMI and thermal requirements.
LT1931AES5#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:
- 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1931AES5#TRPBF FAQ
1.How can I place an order for LT1931AES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1931AES5#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 LT1931AES5#TRPBF reliable?
The price and inventory of LT1931AES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1931AES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1931AES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1931AES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1931AES5#TRPBF?
LT1931AES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1931AES5#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 LT1931AES5#TRPBF?
For technical support, including LT1931AES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1931AES5#TRPBF requirements.
6.How does Aetrix verify that LT1931AES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1931AES5#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 LT1931AES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1931AES5#TRPBF?
All LT1931AES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1931AES5#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 LT1931AES5#TRPBF part is unused and in its original packaging.
Return procedure for LT1931AES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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