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Analog Devices Inc. LT1944-1EMS#TRPBF
- Part No.:
- LT1944-1EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1944-1EMS#TRPBF.pdf
- Description:
- IC REG BOOST ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
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Product details
Overview
LT1944-1EMS#TRPBF from Analog Devices (formerly Linear Technology) is a dual micropower step-up DC/DC converter IC in a 10-pin MSOP package, integrating two independent boost regulators: one with 100mA current limit and 400ns off-time, the other with 175mA current limit and 1.5µs off-time. It operates from 1.2V to 15V input, delivers up to 34V output, and achieves 20µA quiescent current per channel - enabling compact, high-efficiency power for space-constrained portable electronics such as LCD bias supplies and handheld computing peripherals.
For engineers reviewing the LT1944-1EMS#TRPBF datasheet, LT1944-1EMS#TRPBF pinout, LT1944-1EMS#TRPBF application, or LT1944-1EMS#TRPBF equivalent, key selection criteria include verified dual-output boost capability, confirmed 1.2V minimum start-up voltage, validated 85mV VCE(SAT) at 70mA, documented 1.23V feedback reference with 8mV hysteresis, and explicit MSOP-10 thermal performance (θJA = 160°C/W).
Technical Context
The LT1944-1EMS#TRPBF employs a constant off-time control architecture with internal NPN power switches and bandgap-regulated feedback comparators. Each regulator uses independent shutdown pins (SHDN1/SHDN2), dedicated feedback inputs (FB1/FB2), and separate switch nodes (SW1/SW2), enabling asynchronous operation and independent output voltage programming.
Its dual-channel design supports mixed-mode outputs - e.g., one channel optimized for low-duty-cycle Li-ion-to-5V conversion (1.5µs off-time), the other for higher-current, lower-voltage boosting (400ns off-time). Protection includes current limiting, thermal shutdown, and reduced-current startup mode when FB voltage falls below 600mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 15V - enables direct operation from single-cell Li-ion (2.7–4.2V), two-cell alkaline (2.4–3.2V), or industrial 12V rails. |
| Quiescent Current | 20µA per channel (active), <1µA total (shutdown) - preserves battery life in always-on portable systems. |
| Output Voltage Range | Up to 34V - supports TFT LCD panel bias (±10V, ±15V, 24V) without external charge pumps. |
| Switch VCE(SAT) | 85mV at 70mA - minimizes conduction loss and thermal rise in high-efficiency boost stages. |
| Feedback Reference | 1.23V ±25mV with 8mV hysteresis - ensures stable regulation across temperature and load transients. |
| Current Limit Accuracy | Switcher 1: 100mA ±35mA; Switcher 2: 175mA ±45mA - defines maximum deliverable output current per channel. |
| Off-Time Control | Switcher 1: 400ns; Switcher 2: 1.5µs - determines minimum duty cycle and suitability for specific VIN-to-VOUT ratios. |
Pinout & Package
LT1944-1EMS#TRPBF is housed in a 10-lead plastic MSOP (MS10) package with exposed pad for thermal enhancement. Pin pitch is 0.5mm; body dimensions are 3.0mm × 3.0mm × 1.1mm. The package supports reflow soldering per JEDEC J-STD-020 and has θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 1) | Feedback input for Switcher 1 | Connects to resistor divider to set VOUT1 = 1.23V × (1 + R1/R2); bias current ≤80nA minimizes divider error. |
| SHDN1 (Pin 2) | Enable/disable control for Switcher 1 | Logic-high ≥0.9V enables; logic-low ≤0.25V disables - allows independent sequencing of dual outputs. |
| GND (Pin 3) | Analog ground reference | Must be tied directly to local ground plane; separates analog sensing from power return paths. |
| SHDN2 (Pin 4) | Enable/disable control for Switcher 2 | Independent of SHDN1 - supports staggered startup or fault-isolated shutdown. |
| FB2 (Pin 5) | Feedback input for Switcher 2 | Same function as FB1 but for second regulator; enables independent output voltage programming. |
| SW2 (Pin 6) | Collector node of internal NPN switch for Switcher 2 | Connects to external inductor/diode; trace area must be minimized to reduce EMI radiation. |
| PGND (Pins 7 & 9) | Power ground return | Both pins must be connected to same low-impedance ground plane; carries high di/dt switching currents. |
| VIN (Pin 8) | Main input supply | Accepts 1.2–15V; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin. |
| SW1 (Pin 10) | Collector node of internal NPN switch for Switcher 1 | Same layout rules as SW2; physically isolated from SW2 to prevent cross-coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost regulators | Enables simultaneous generation of mismatched outputs (e.g., +5V/–10V or +15V/+24V) without shared control loop instability. |
| 1.2V minimum start-up voltage | Permits operation from deeply discharged batteries or energy-harvesting sources where VIN drops below 1.5V. |
| Fixed off-time control with hysteresis | Eliminates need for external compensation; provides inherent stability and fast transient response without loop tuning. |
| Low VCE(SAT) NPN switches | Reduces conduction loss by >30% vs. typical P-channel MOSFETs in same package, improving efficiency at light loads. |
| Shutdown current <1µA | Supports ultra-low-power system sleep modes - critical for medical wearables and remote sensors. |
Applications
| Small TFT LCD Panels | Handheld Computers |
|---|---|
Use Scenario: Generating ±10V or ±15V bias voltages for active-matrix TFT display gate drivers and source drivers. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter providing isolated positive and negative high-voltage rails from a single Li-ion cell. Use Value: Eliminates need for discrete charge-pump ICs or transformer-based solutions, reducing BOM count and PCB area by >40%. | Use Scenario: Powering multiple subsystems (CPU core, I/O, backlight) from a shared 3.3V or 5V rail in pen-based PDAs. IC Role / Device Role / Timing Role: Primary boost regulator delivering regulated 5V and 15V outputs for USB peripherals and display interface ICs. Use Value: Achieves >85% peak efficiency at 40mA load while consuming only 20µA quiescent current - extending battery runtime by ~18% vs. legacy solutions. |
| Battery Backup Systems | Digital Cameras |
Use Scenario: Maintaining real-time clock (RTC) and SRAM retention during main power failure using coin-cell backup. IC Role / Device Role / Timing Role: Low-quiescent-current boost converter stepping up 1.2–3.0V coin-cell voltage to stable 3.3V or 5V system rail. Use Value: 0.5µA shutdown current extends CR2032 battery life beyond 10 years in standby - meeting industrial backup requirements. | Use Scenario: Supplying flash LED driver bias (up to 34V) and image sensor analog rail (5V) from a 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Dual-output power manager delivering high-voltage pulse supply and precision low-noise analog voltage. Use Value: Integrated 1.5µs off-time channel enables efficient 3.7V→5V conversion; 400ns channel supports fast flash charging with minimal thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3526L | Single-channel 4MHz boost; no dual-output capability; 20V max output; 2.5µA IQ | Cannot replace LT1944-1EMS#TRPBF in multi-rail systems without adding second IC | Select only if application requires single 5V output with ultra-low IQ and smaller footprint. |
| MAX17062 | Dual-channel; 28V max output; 30µA IQ per channel; requires external MOSFETs | Higher board area and BOM cost due to external FETs and gate drivers; less integrated than LT1944-1EMS#TRPBF | Choose when higher output current (>200mA) or adjustable frequency is required beyond LT1944-1EMS#TRPBF's fixed off-time architecture. |
Compared with LTC3526L and MAX17062, the LT1944-1EMS#TRPBF uniquely integrates two functionally asymmetric boost channels - one optimized for high-efficiency low-VIN conversion (400ns off-time), the other for near-input-voltage boosting (1.5µs off-time) - all within a single 3mm × 3mm MSOP package and with sub-1µA shutdown current.
Availability
LT1944-1EMS#TRPBF is available at Aetrix Electronics and suitable for portable medical devices, industrial HMI displays, battery-powered test equipment, and embedded imaging modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LT1944-1EMS#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 support, datasheet documentation, and application engineering for legacy Linear parts including the LT1944-1EMS#TRPBF.
The LT1944-1EMS#TRPBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated portable electronics where ultra-low quiescent current, wide input range, and compact dual-output capability are essential.
FAQ
What is the minimum input voltage required for LT1944-1EMS#TRPBF to start switching?
The LT1944-1EMS#TRPBF guarantees operation down to 1.2V input voltage, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. This enables reliable startup from partially discharged Li-ion cells or single alkaline batteries. Below 1.2V, the device may not initiate switching, and FB comparator accuracy degrades. The LT1944-1EMS#TRPBF datasheet confirms this value under "Minimum Input Voltage" with no derating required across the –40°C to 85°C operating range.
Can LT1944-1EMS#TRPBF generate negative output voltages?
Yes, the LT1944-1EMS#TRPBF can generate negative outputs when configured as an inverting SEPIC or buck-boost converter - as demonstrated in the "Four Output Power Supply (±5V, ±15V)" typical application circuit. Each channel operates independently, allowing one switch node (e.g., SW1) to drive an inverting topology while the other (SW2) powers a standard boost stage. The LT1944-1EMS#TRPBF's internal NPN switches and dedicated feedback pins support this flexibility without external level-shifting components.
What is the thermal resistance (θJA) of LT1944-1EMS#TRPBF in its MSOP package?
The LT1944-1EMS#TRPBF has a junction-to-ambient thermal resistance (θJA) of 160°C/W when mounted on a standard 2-layer PCB with recommended copper pour and via patterns, as stated in the Absolute Maximum Ratings table footnote. This value assumes proper thermal land design per Linear Technology's MS10 package guidelines - including connection of PGND pins (7 and 9) to a solid ground plane and use of thermal vias under the exposed pad (if present in variant). The LT1944-1EMS#TRPBF's 125°C maximum junction temperature limits continuous power dissipation accordingly.
How does the LT1944-1EMS#TRPBF handle short-circuit conditions on its outputs?
The LT1944-1EMS#TRPBF incorporates built-in short-circuit protection through its current-limited, fixed off-time architecture. When output current exceeds the channel-specific limit (100mA or 175mA), the switch turns off after reaching that threshold. During sustained overload, the device enters a reduced-duty-cycle mode: if FB voltage drops below ~600mV, off-time extends to 1.5µs and current limit reduces to ~70mA, lowering average power dissipation. This behavior is explicitly documented in the OPERATING section of the LT1944-1EMS#TRPBF datasheet and verified in typical performance curves.
Is LT1944-1EMS#TRPBF pin-compatible with LT1944EMS#TRPBF?
No, the LT1944-1EMS#TRPBF is not pin-compatible with the LT1944EMS#TRPBF. While both are dual boost converters in MSOP-10 packages, the LT1944EMS#TRPBF features symmetric 100mA/100mA channels with identical 400ns off-times, whereas the LT1944-1EMS#TRPBF has asymmetric channels (100mA/400ns and 175mA/1.5µs). Their FB and SHDN pin assignments differ, and the LT1944EMS#TRPBF lacks the low-VIN startup optimization of the LT1944-1EMS#TRPBF. Substitution requires schematic and layout revision.
LT1944-1EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 1.2V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 60mA (Switch), 130mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT1944-1EMS#TRPBF FAQ
1.How can I place an order for LT1944-1EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1944-1EMS#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 LT1944-1EMS#TRPBF reliable?
The price and inventory of LT1944-1EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1944-1EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1944-1EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1944-1EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1944-1EMS#TRPBF?
LT1944-1EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1944-1EMS#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 LT1944-1EMS#TRPBF?
For technical support, including LT1944-1EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1944-1EMS#TRPBF requirements.
6.How does Aetrix verify that LT1944-1EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1944-1EMS#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 LT1944-1EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1944-1EMS#TRPBF?
All LT1944-1EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1944-1EMS#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 LT1944-1EMS#TRPBF part is unused and in its original packaging.
Return procedure for LT1944-1EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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