My Inquiry
My Account
Analog Devices Inc. LT1944EMS#TRPBF
- Part No.:
- LT1944EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1944EMS#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 250MA DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,600
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1944EMS#TRPBF from Analog Devices (formerly Linear Technology) is a dual micropower step-up DC/DC converter IC in a 10-pin MSOP package, featuring two independent boost regulators with 350mA current limit per channel, 1.2V to 15V input range, and up to 34V output capability. It delivers low-noise bias for LCDs and backup power in portable systems requiring ultra-low quiescent current.
For engineers reviewing the LT1944EMS#TRPBF datasheet, LT1944EMS#TRPBF pinout, LT1944EMS#TRPBF application, or LT1944EMS#TRPBF equivalent, key selection criteria include shutdown current (<1µA), fixed 400ns off-time control, 250mV VCE(SAT) at 300mA, dual independent enable pins (SHDN1/SHDN2), and compatibility with tiny surface-mount inductors and ceramic capacitors.
Technical Context
The LT1944EMS#TRPBF implements a constant off-time, current-limited control scheme with internal NPN power switches and bandgap-regulated feedback comparators (1.23V ±25mV trip point, 8mV hysteresis). Each regulator operates independently with dedicated FB1/FB2 and SHDN1/SHDN2 pins, enabling asynchronous dual-output configurations.
Its 36V-rated SW1/SW2 pins support high-voltage boost topologies without transformers; the 400ns minimum off-time enables use of sub-5µH inductors, while the 0.5µA shutdown current and 20µA active quiescent current optimize battery life in intermittent-load applications like handheld displays and digital cameras.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 15V - supports single-cell Li-ion (2.7–4.2V), alkaline (1.2–1.5V), or multi-cell inputs without pre-regulation |
| Output Voltage Range | Up to 34V - enables direct LCD bias generation (e.g., +15V/-6.5V dual-rail) without external charge pumps |
| Quiescent Current | 20µA per channel - maintains >100-hour standby in coin-cell-powered devices |
| Shutdown Current | 0.5µA total - reduces system leakage to negligible levels during deep sleep |
| Switch VCE(SAT) | 250mV at 300mA - minimizes conduction loss and thermal rise in compact layouts |
| Switch Current Limit | 350mA per channel - sets maximum inductor ramp current and defines peak power delivery capability |
| Feedback Reference | 1.23V ±25mV - determines output voltage accuracy via external resistor divider (R1/R2) |
Pinout & Package
LT1944EMS#TRPBF is housed in a 10-lead plastic MSOP (MS10) package measuring 3.0mm × 3.0mm × 1.1mm, with exposed thermal pad (PGND pins 7 and 9) for enhanced power dissipation in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 1) | Feedback input for Channel 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 Channel 1 | Logic-high (>0.9V) enables regulator; logic-low (<0.25V) forces 0.5µA shutdown mode |
| GND (Pin 3) | Analog ground reference | Must be tied directly to local ground plane; separates signal ground from power ground paths |
| SHDN2 (Pin 4) | Enable/disable control for Channel 2 | Independent of SHDN1 - allows staggered startup or selective channel disable |
| FB2 (Pin 5) | Feedback input for Channel 2 | Same function as FB1 but for second regulator; supports independent output voltage programming |
| SW2 (Pin 6) | Collector of internal NPN switch for Channel 2 | Drives external inductor/diode; requires minimal trace area to reduce EMI radiation |
| PGND (Pins 7, 9) | Power ground return | Both pins must be connected to low-impedance ground plane to handle pulsed switch currents |
| VIN (Pin 8) | Main input supply | Bypass with ≥4.7µF ceramic capacitor placed adjacent to pin to suppress input ripple and noise |
| SW1 (Pin 10) | Collector of internal NPN switch for Channel 1 | Same role as SW2; layout symmetry recommended for balanced EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost regulators | Enables simultaneous generation of mismatched outputs (e.g., 5V + 30V) without cross-coupling or shared timing constraints |
| 400ns fixed off-time control | Permits use of 4.7µH inductors in 2-cell battery apps, reducing board area by >40% vs. traditional 1MHz PWM controllers |
| 0.5µA shutdown current | Extends shelf life and standby time in battery-backed memory or real-time clock circuits |
| 36V switch rating | Supports direct 34V LCD panel bias without transformer isolation or cascaded stages |
| Low 250mV VCE(SAT) | Reduces thermal load at full 300mA load, allowing operation in 50°C ambient without heatsinking |
Applications
| LCD Bias Generation | Handheld Computer Power |
|---|---|
Use Scenario: Generating +15V and –6.5V rails for color TFT LCD panels in portable medical monitors. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter providing isolated high-voltage bias with independent regulation and sequencing. Use Value: Eliminates need for discrete charge-pump ICs and external transformers, reducing BOM count by 3 components and PCB area by 22 mm². | Use Scenario: Powering 3.3V microcontroller and 5V peripheral interface from a 2-cell NiMH battery (2.4–3.0V). IC Role / Device Role / Timing Role: Dual-output step-up regulator delivering regulated outputs with independent enable control for subsystem power gating. Use Value: Achieves >80% efficiency at 80mA load across full battery discharge curve, extending runtime by 18% vs. linear regulators. |
| Digital Camera Flash Support | Backup Power Supply |
Use Scenario: Charging a 100µF storage capacitor to 30V for white LED flash in compact digital cameras. IC Role / Device Role / Timing Role: High-voltage boost converter operating in burst mode during flash charging, then entering 0.5µA shutdown. Use Value: Charges capacitor to 30V in <1.2s from 2.7V input, with <2% voltage droop during 500ms flash pulse. | Use Scenario: Maintaining SRAM and RTC voltage during main power failure in industrial data loggers. IC Role / Device Role / Timing Role: Micropower boost converter activated only when main supply drops below threshold, sustaining 3.3V rail from coin cell. Use Value: Draws just 20µA quiescent current during monitoring, enabling >5-year coin-cell lifetime with 200mAh capacity. |
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 | Higher switching frequency (2MHz), smaller inductors (2.2µH), but higher quiescent current (35µA/channel) | Better suited for ultra-thin devices where board height is constrained, less optimal for long-life battery apps | Select LTC3526L when footprint reduction outweighs standby current penalty |
| MAX1706 | Single-channel, 30V switch rating, no independent shutdown pins, 25µA quiescent current | Requires two ICs for dual output, increasing cost and layout complexity | Choose MAX1706 only if channel independence and 34V output are not required |
Compared with LTC3526L and MAX1706, the LT1944EMS#TRPBF uniquely balances ultra-low shutdown current (0.5µA), dual independent control, and 34V output capability in a single 10-pin MSOP - making it the only option for space- and battery-limited dual-rail bias generation.
Availability
LT1944EMS#TRPBF is available at Aetrix Electronics and suitable for LCD bias generation, handheld computer power management, and digital camera flash charging requiring stable component supply across extended production lifecycles.
Supply support for LT1944EMS#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 precision analog and power management product lines with full datasheet, simulation model, and application support.
The LT1944EMS#TRPBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated portable equipment where ultra-low quiescent current and high-voltage boost capability are critical.
FAQ
What is the minimum input voltage supported by the LT1944EMS#TRPBF?
The LT1944EMS#TRPBF supports a minimum input voltage of 1.2V, verified across temperature and process corners. This enables direct operation from single-cell alkaline, NiMH, or low-voltage LiFePO₄ batteries without pre-regulation. The device maintains regulation down to this threshold while delivering up to 34V output with appropriate external components.
Does the LT1944EMS#TRPBF require external compensation components?
No, the LT1944EMS#TRPBF uses a hysteretic, constant off-time control architecture that does not require external compensation. Its internal feedback loop is inherently stable with standard ceramic output capacitors (≥10µF) and inductors (4.7–10µH). Adding a 4.7pF feed-forward capacitor in the FB network reduces output ripple but is optional, not compensatory.
Can both channels of the LT1944EMS#TRPBF be operated simultaneously with different output voltages?
Yes, the LT1944EMS#TRPBF supports fully independent operation: FB1 and FB2 accept separate resistor dividers, SHDN1 and SHDN2 allow individual enable/disable control, and SW1/SW2 drive separate inductor-diode networks. Typical applications include 3.3V + 30V or +15V/–6.5V dual-rail LCD bias, confirmed in the datasheet's TA03 circuit.
What is the thermal performance of the LT1944EMS#TRPBF in a 10-pin MSOP package?
The LT1944EMS#TRPBF has a junction-to-ambient thermal resistance (θJA) of 160°C/W under standard JEDEC conditions. With its dual PGND pins (7 and 9) and exposed pad design, it sustains continuous 300mA per channel at 25°C ambient. At 50°C ambient and full load, junction temperature remains below 125°C - the rated maximum - when using a 1-in² 2-oz copper pour under the package.
Which Schottky diodes are recommended for use with the LT1944EMS#TRPBF?
The LT1944EMS#TRPBF datasheet specifies ON Semiconductor MBR0520 (20V, 0.5A), MBR0530 (30V), and MBR0540 (40V) Schottky diodes as validated choices. These parts provide low forward voltage (≤0.4V) and fast recovery (<1ns), matching the LT1944EMS#TRPBF's 400ns off-time. Diode current rating must exceed 350mA peak, and voltage rating must exceed the target output voltage by ≥20%.
LT1944EMS#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:
- 250mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT1944EMS#TRPBF FAQ
1.How can I place an order for LT1944EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1944EMS#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 LT1944EMS#TRPBF reliable?
The price and inventory of LT1944EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1944EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1944EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1944EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1944EMS#TRPBF?
LT1944EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1944EMS#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 LT1944EMS#TRPBF?
For technical support, including LT1944EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1944EMS#TRPBF requirements.
6.How does Aetrix verify that LT1944EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1944EMS#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 LT1944EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1944EMS#TRPBF?
All LT1944EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1944EMS#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 LT1944EMS#TRPBF part is unused and in its original packaging.
Return procedure for LT1944EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1944EMS#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
