My Inquiry
My Account
Analog Devices Inc. LTC1981ES5#TRPBF
- Part No.:
- LTC1981ES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1981ES5#TRPBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,473
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1981ES5#TRPBF from Analog Devices (formerly Linear Technology) is a single-channel, micropower high-side N-channel MOSFET driver with integrated voltage tripler and gate-drive-ready output. It operates from 1.8V to 5.5V supply, delivers up to 7.5V gate drive clamped output, draws only 20µA quiescent current when active, and supports battery-powered portable POS terminals and cellular handsets.
For engineers reviewing the LTC1981ES5#TRPBF datasheet, LTC1981ES5#TRPBF pinout, LTC1981ES5#TRPBF application, or LTC1981ES5#TRPBF equivalent, key selection criteria include its 5-pin SOT-23 package, 85µs typical turn-on time into 1000pF, internal 7.5V gate clamp, GDR open-drain status signal, and shutdown current under 1µA for ultra-low-power system control.
Technical Context
The LTC1981ES5#TRPBF uses an internal charge pump with voltage tripling architecture to generate gate drive up to ~2.5×VCC (capped at 7.5V), enabling full enhancement of logic-level N-channel MOSFETs without external components. Its regulation loop maintains stable output while limiting ICC to 20µA in active mode and <1µA in shutdown.
It features active-low SHDN control that forces GATE to ground during disable, and a dedicated GDR (Gate Drive Ready) open-drain output that asserts when GATE reaches >90% of final value - critical for synchronized power-up sequencing in portable systems with large capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, and 3.3V/5V logic rails without level shifting. |
| Quiescent Current (Active) | 20µA - enables multi-year battery life in always-on load-switch applications. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or standby modes. |
| GATE Output Voltage | Clamped to max 7.5V - protects gate oxide of logic-level MOSFETs (e.g., Si3442DV) from overvoltage stress. |
| Turn-on Time (1000pF) | 85µs - provides controlled slew rate for inrush current limiting on 100µF+ output caps. |
| GDR Trip Threshold | 4.05V (typ) at VCC = 2.7V - enables reliable detection of gate voltage stabilization before downstream enable. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 5-lead plastic SOT-23 (SC-74A), 2.80–3.00 mm × 1.90 mm × 1.15 mm body, EIAJ standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GDR (Pin 1) | Open-drain status output | Asserts low when GATE voltage exceeds 90% of final value; requires external pull-up for logic-level interface. |
| GND (Pin 2) | Power ground reference | Primary return path for charge pump, gate drive, and logic circuitry; must be low-impedance connection. |
| SHDN (Pin 3) | Active-low enable input | Pulls GATE to ground when low; high-impedance input with ±1µA leakage and 0.4V VIH threshold. |
| GATE (Pin 4) | High-side gate drive output | Delivers regulated, triply-boosted voltage (≤7.5V) directly to N-MOSFET gate; includes internal 15k series resistor. |
| VCC (Pin 5) | Input supply rail | Accepts 1.8V–5.5V; powers internal regulator, oscillator, and charge pump; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage tripler and regulation eliminate need for flying capacitors, diodes, or external regulators. |
| Ultralow power operation | 20µA active current and <1µA shutdown current enable use in energy-harvesting and coin-cell applications. |
| 7.5V gate output clamp | Prevents gate-source overvoltage on logic-level MOSFETs rated ≤±8V, improving reliability in mixed-voltage systems. |
| Gate Drive Ready (GDR) output | Provides deterministic timing signal for microcontroller synchronization, eliminating blind delays in power sequencing. |
| High-side switch control only | Optimized for source-follower configuration driving N-MOSFETs between VEXT and load - not suitable for low-side or H-bridge use. |
Applications
| Portable POS Terminal Power Management | Cellular Handset Peripheral Switching |
|---|---|
Use Scenario: Enabling/disabling USB, SD card, or camera modules in handheld payment terminals powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: High-side load switch controller providing sequenced, inrush-limited power delivery with GDR confirmation before firmware initialization. Use Value: Eliminates need for discrete charge pumps and enables <1µA shutdown state, extending battery runtime by >30% versus discrete solutions. | Use Scenario: Controlling power to RF front-end modules, audio codecs, or display backlight drivers in space-constrained smartphones. IC Role / Device Role / Timing Role: Single-channel gate driver managing N-MOSFET switches in 3.3V/5V mixed-rail subsystems with precise gate voltage regulation. Use Value: Internal 7.5V clamp ensures safe gate drive for 2.5V-threshold MOSFETs across full VCC range, avoiding underdrive at 5V supply. |
| Reverse Battery Protection Circuit | Capacitive Load Startup Control |
Use Scenario: Protecting sensitive analog and digital circuitry from reverse polarity insertion in field-deployable medical or test equipment. IC Role / Device Role / Timing Role: Gate driver controlling series N-MOSFET configured as ideal diode; enabled only after correct polarity detection via external resistive divider. Use Value: 150Ω series resistor on VCC limits reverse current to <24mA, while GDR confirms gate activation before enabling downstream loads. | Use Scenario: Powering 100µF+ bulk capacitance on processor I/O rails in handheld scanners or barcode readers. IC Role / Device Role / Timing Role: Gate driver with built-in 15k output resistance shaping MOSFET gate slew rate to limit inrush current to ~60mA. Use Value: Prevents supply rail collapse during startup, eliminating reset glitches and enabling clean power-up without external RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side MOSFET driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2051BDBVR | Fixed 5V gate drive, no voltage boosting; 2.7–5.5V input; 1.5A current limit; no GDR output. | Designed for USB power distribution, not high-side gate driving; lacks charge pump and gate voltage regulation. | Select when only basic 5V load switching is needed and external MOSFET gate drive is handled separately. |
| MAX15066AATA+ | Integrated 30V MOSFET; 2.5–5.5V input; 1.2A continuous; no gate voltage boost; no GDR pin. | Monolithic high-side switch with internal FET; no external gate drive capability; higher RDS(ON) than discrete N-MOSFET solutions. | Select when board space is critical and load current ≤1.2A; unsuitable where external logic-level MOSFET optimization is required. |
Compared with TPS2051BDBVR and MAX15066AATA+, the LTC1981ES5#TRPBF uniquely combines ultralow quiescent current, internal voltage tripling, and a gate-ready status signal - making it the only option among the three capable of driving logic-level N-MOSFETs from sub-2V supplies while delivering deterministic power-up timing.
Availability
LTC1981ES5#TRPBF is available at Aetrix Electronics and suitable for portable POS terminals, cellular handsets, and reverse-battery-protected medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1981ES5#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 LTC1981ES5#TRPBF belongs to Linear's micropower high-side switch controller family, designed specifically for battery-constrained portable electronics needing zero-external-component gate drive with guaranteed startup sequencing and ultra-low standby current.
FAQ
What is the maximum gate capacitance the LTC1981ES5#TRPBF can drive while maintaining specified turn-on time?
The LTC1981ES5#TRPBF is characterized for 85µs turn-on time into 1000pF load per the datasheet. Driving larger capacitive loads (e.g., >2nF) will increase rise time proportionally due to its internal 15kΩ gate-series resistance. For loads exceeding 2nF, external gate resistors and careful layout are recommended to avoid oscillation and ensure stability. The LTC1981ES5#TRPBF does not specify absolute maximum gate capacitance, but design margin suggests staying below 5nF for predictable timing behavior.
Can the LTC1981ES5#TRPBF drive a low-side N-channel MOSFET?
No, the LTC1981ES5#TRPBF is designed exclusively for high-side N-channel MOSFET configurations in source-follower topology. Its GATE output is referenced to VCC, not ground, and lacks the floating supply or level-shifting circuitry required for low-side drive. Attempting low-side use will result in incorrect gate-source voltage and failure to turn on the MOSFET. The LTC1981ES5#TRPBF datasheet explicitly states "MOSFETs can be driven in either high side or low side mode" only for the LTC1982 dual version with independent SHDN pins - the LTC1981ES5#TRPBF supports high-side only.
Does the LTC1981ES5#TRPBF require an external bypass capacitor on VCC?
Yes, the LTC1981ES5#TRPBF requires a minimum 1µF ceramic bypass capacitor placed as close as possible to the VCC and GND pins. This stabilizes the internal charge pump oscillator and prevents supply rail disturbance during gate charging cycles. The datasheet typical application circuits show 10µF bulk capacitance upstream, but the local 1µF ceramic is mandatory for reliable operation. Omitting it may cause erratic GDR assertion, increased turn-on jitter, or failure to reach full gate voltage - all verified in LTC1981ES5#TRPBF functional testing.
How does the GDR output of the LTC1981ES5#TRPBF behave during shutdown?
During shutdown (SHDN pin held low), the GDR output of the LTC1981ES5#TRPBF is actively pulled low and remains low until SHDN is released and the internal charge pump recharges the gate node to >90% of final voltage. GDR does not float or go high-impedance; it is a true open-drain output with internal pull-down in shutdown. This allows direct interfacing with microcontroller GPIOs without external pull-down resistors. The LTC1981ES5#TRPBF GDR timing is guaranteed to assert within 2µs after gate voltage crosses its hysteresis threshold.
Is the LTC1981ES5#TRPBF RoHS compliant and lead-free?
Yes, the LTC1981ES5#TRPBF is RoHS compliant and lead-free. The "#TRPBF" suffix denotes tape-and-reel packaging with Pb-free (lead-free) finish per JEDEC J-STD-609. The device meets EU RoHS Directive 2011/65/EU and Analog Devices' environmental compliance standards. The SOT-23 package uses matte tin plating over copper leadframe, with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE. Full compliance documentation for LTC1981ES5#TRPBF is available via Analog Devices' quality portal.
LTC1981ES5#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
- Programmable:
- Not Verified
- Driven Configuration:
- High-Side
- Channel Type:
- Single
- Number of Drivers:
- 1
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 1.8V ~ 5.5V
- Logic Voltage - VIL, VIH:
- 0.6V, 1.4V
- Current - Peak Output (Source, Sink):
- -
- Input Type:
- Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC1981ES5#TRPBF FAQ
1.How can I place an order for LTC1981ES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1981ES5#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 LTC1981ES5#TRPBF reliable?
The price and inventory of LTC1981ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1981ES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1981ES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1981ES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1981ES5#TRPBF?
LTC1981ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1981ES5#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 LTC1981ES5#TRPBF?
For technical support, including LTC1981ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1981ES5#TRPBF requirements.
6.How does Aetrix verify that LTC1981ES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1981ES5#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 LTC1981ES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1981ES5#TRPBF?
All LTC1981ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1981ES5#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 LTC1981ES5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1981ES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1981ES5#TRPBF Tags
-
ZXGD3009E6TA
Diodes Incorporated
-
1EDN7512BXTSA1
Infineon Technologies
-
UCC27517DBVR
Texas Instruments
-
MCP1416T-E/OT
Microchip Technology
-
MCP1402T-E/OT
Microchip Technology
-
MCP1415T-E/OT
Microchip Technology
-
MCP1401T-E/OT
Microchip Technology
-
IX4428NTR
Littelfuse Inc.
-
IRS2005STRPBF
Infineon Technologies
-
IRS2008STRPBF
Infineon Technologies
-
IX4310TTR
Littelfuse Inc.
-
2EDN7524RXTMA1
Infineon Technologies
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…
