My Inquiry
My Account
Analog Devices Inc. LTC1148CS-5#TRPBF
- Part No.:
- LTC1148CS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148CS-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,959
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1148CS-5#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external complementary MOSFETs to deliver regulated 5V output. It features constant off-time current-mode architecture, ultrahigh efficiency (>95% at 1A), 160µA light-load standby current, wide 3.5V–20V input range, and adaptive nonoverlap gate drives-used in portable instrumentation power supplies requiring high efficiency across multi-decade load currents.
For engineers reviewing the LTC1148CS-5#TRPBF datasheet, LTC1148CS-5#TRPBF pinout, LTC1148CS-5#TRPBF application, or LTC1148CS-5#TRPBF equivalent, key selection criteria include feedback voltage tolerance (±4%), current-sense threshold (125–175mV), shutdown threshold (0.55–2V), off-time programmability via CT capacitor, and compatibility with P-channel/N-channel MOSFET pairs for low-dropout operation.
Technical Context
The LTC1148CS-5#TRPBF implements a constant off-time current-mode control architecture that dynamically adjusts switching frequency based on input-output differential voltage. Its internal gain block and voltage comparator jointly manage burst-mode (for <300mA loads) and continuous-mode (for >300mA loads) operation to maintain high efficiency across 0–2A output range.
It integrates adaptive nonoverlap gate drivers for P-DRIVE (Pin 1) and N-DRIVE (Pin 14), preventing shoot-through by enforcing sequencing: P-DRIVE must be high before N-DRIVE can rise, and N-DRIVE must fall before P-DRIVE can drop. The SENSE+ (Pin 8)/SENSE− (Pin 7) differential pair sets peak inductor current via external RSENSE, while INTVCC (Pin 5) provides a regulated 3.3V supply for internal circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (4.90–5.20V over load/temperature); eliminates need for external feedback divider in 5V systems. |
| Input Voltage Range | 3.5V to 20V; supports single-cell Li-ion up to 18V industrial rails without external LDO pre-regulation. |
| Current Sense Threshold | 125–175mV (typ. 150mV); sets peak inductor current with ±20% tolerance, enabling precise IMAX programming via RSENSE. |
| Standby Current | 160–260µA in Sleep Mode; enables >1000-hour battery life in always-on portable devices drawing microamps between active bursts. |
| Shutdown Current | 10–22µA; reduces system-level quiescent power to sub-20µA when host MCU asserts logic-high SHUTDOWN (Pin 10). |
| Off-Time Range | 3.8–6µs (CT = 390pF); determines minimum switching period and directly scales with VOUT, enabling dropout regulation down to (VIN − VOUT) ≈ 0.3V. |
| Feedback Voltage Accuracy | ±4% (1.21–1.29V at VFB); ensures tight output regulation despite temperature drift and PCB layout parasitics. |
Pinout & Package
Package: 14-lead narrow SO (SO-14), 150 mil width, θJA = 110°C/W, RoHS-compliant, tape-and-reel (TRPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current gate driver output | Drives P-channel MOSFET source; swings rail-to-rail (VIN to GND); requires low-inductance routing to minimize shoot-through risk. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and gate drive energy; must be decoupled within 5mm of PGND (Pin 12) with ≥1µF ceramic + bulk electrolytic. |
| SENSE− (Pin 7) | Inverting current sense input | Connects to low-side of RSENSE; forms differential pair with SENSE+ (Pin 8) to detect peak inductor current. |
| SENSE+ (Pin 8) | Non-inverting current sense input | Connects to high-side of RSENSE; built-in offset enables accurate current trip without external amplification. |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | Active-low: <0.8V = normal operation; >2V = micropower shutdown; CMOS-compatible with tR/tF <1µs. |
| PGND (Pin 12) | Power ground return | Carries high di/dt switch node return current; must be star-connected to CIN (−) and N-MOSFET source to avoid noise coupling into SGND. |
| N-DRIVE (Pin 14) | High-current gate driver output | Drives N-channel MOSFET gate; swings GND to VIN; requires matched trace length to P-DRIVE for timing symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency >95% | Synchronous FET switching eliminates Schottky diode loss; maintains >90% efficiency from 10mA to 2A output current. |
| Adaptive nonoverlap gate drives | Hardware-enforced dead-time prevents simultaneous conduction of P- and N-MOSFETs, eliminating shoot-through failure risk. |
| Constant off-time architecture | Enables 100% duty cycle operation near dropout; regulates output even when VIN − VOUT < 0.5V with only RDS(ON) and inductor DCR limiting dropout. |
| Burst Mode™ operation | Reduces switching losses at light loads; cuts quiescent power to 2mW at VIN = 10V, IOUT = 0, extending battery runtime in intermittent-use devices. |
| Wide input range (3.5V–20V) | Supports direct connection to unregulated 12V rails, automotive batteries (with transient clamping), and multi-cell Li-ion packs without pre-regulators. |
Applications
| Portable Instrumentation Power | Battery-Powered Digital Systems |
|---|---|
Use Scenario: Handheld multimeter with LCD backlight, microcontroller, and analog front-end operating from two AA cells (2.4–3.2V) or USB (5V). IC Role / Device Role / Timing Role: Primary DC-DC controller regulating stable 5V rail for MCU and peripherals while adapting to declining battery voltage. Use Value: Maintains >92% efficiency down to 2.4V input, enabling full instrument functionality until battery reaches end-of-life voltage. | Use Scenario: Wireless sensor node with BLE radio, accelerometer, and flash memory powered by coin cell or rechargeable LiPo. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 5V to radio during transmit bursts and entering Burst Mode during sleep cycles. Use Value: 160µA sleep current extends 10-year battery life; adaptive off-time prevents audible switching noise near dropout. |
| DC Power Distribution Systems | Notebook Subsystem Regulation |
Use Scenario: Industrial IoT gateway with multiple isolated 5V rails for Ethernet PHY, RS-485 transceivers, and microcontroller. IC Role / Device Role / Timing Role: Point-of-load controller converting 12V/24V backplane to local 5V with short-circuit protection and thermal derating. Use Value: Short-circuit protection limits fault current to ~2A; 110°C/W SO-14 package allows operation at 70°C ambient without heatsink. | Use Scenario: Secondary power rail in ultra-thin notebook for USB-C PD negotiation IC and Type-C port controller. IC Role / Device Role / Timing Role: Compact, low-noise 5V regulator supporting fast transient response during USB enumeration and hot-plug events. Use Value: Current-mode control delivers <50µs recovery from 1A load step; low ESR output cap requirement simplifies layout in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AEDD#TRPBF | Integrated power MOSFETs (no external FETs required); fixed 5V output; higher 2.5mA quiescent current; no Burst Mode. | Better for space-constrained designs where external FET layout is impractical; less efficient below 50mA due to higher IQ. | Select LT3502AEDD#TRPBF when board area is critical and load exceeds 100mA continuously. |
| TPS54202DDCR | Internal FETs; 4.5–17V input; 2A output; 45µA shutdown current; uses voltage-mode control with external compensation. | Lower BOM count but reduced light-load efficiency (<85% at 10mA); no adaptive nonoverlap, requiring careful gate drive design. | Select TPS54202DDCR when cost-per-watt is prioritized over ultra-low IQ and shoot-through immunity. |
Compared with LT3502AEDD#TRPBF and TPS54202DDCR, LTC1148CS-5#TRPBF offers superior light-load efficiency via Burst Mode™ and hardware-enforced gate timing, making it optimal for battery-powered systems requiring >1000-hour standby, while retaining flexibility to optimize efficiency and thermal performance via external MOSFET selection.
Availability
LTC1148CS-5#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered digital systems, and DC power distribution systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1148CS-5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1148 series belongs to Linear's legacy high-efficiency power controller product line, designed specifically for portable and battery-sensitive applications demanding ultralow quiescent current, wide input range, and robust synchronous buck control without integrated power stages.
FAQ
What is the maximum continuous output current supported by the LTC1148CS-5#TRPBF?
The LTC1148CS-5#TRPBF itself does not deliver output current-it controls external P-channel and N-channel MOSFETs. Maximum output current depends on selected MOSFETs, inductor, and thermal design. With appropriate Si4431DY/Si4412DY FETs and proper layout, LTC1148CS-5#TRPBF-based designs reliably deliver 2A continuous output. The controller's current-sense threshold (125–175mV) and RSENSE selection determine peak current capability.
Does the LTC1148CS-5#TRPBF require an external feedback resistor network?
No. The LTC1148CS-5#TRPBF is the fixed 5V output version: SENSE− (Pin 7) and SENSE+ (Pin 8) connect across RSENSE, and internal resistive divider sets regulation to 5.05V nominal. Pin 9 (VFB) is NC. External resistors are only needed for adjustable versions like LTC1148CS.
How does the LTC1148CS-5#TRPBF achieve ultrahigh efficiency above 95%?
The LTC1148CS-5#TRPBF achieves >95% efficiency through synchronous FET switching (replacing lossy Schottky diodes), adaptive nonoverlap gate drives (eliminating shoot-through), constant off-time architecture (minimizing switching loss near dropout), and Burst Mode™ operation (reducing gate charge and switching losses at light loads). Efficiency peaks at ~1A with typical 5V/12V input.
Can the LTC1148CS-5#TRPBF operate with input voltages below 3.5V?
No. Absolute minimum input voltage is 3.5V for the LTC1148CS-5#TRPBF (LTC1148L variants support 3.5V; standard LTC1148HV supports up to 20V). Operation below 3.5V risks improper biasing of internal references and gate drivers, leading to regulation failure or erratic Burst Mode behavior. Always maintain VIN ≥ 3.5V.
What is the purpose of the CT pin (Pin 4) on the LTC1148CS-5#TRPBF?
The CT pin (Pin 4) connects to an external timing capacitor that sets the off-time duration-and thus the switching frequency-in the LTC1148CS-5#TRPBF's constant off-time architecture. A 390pF capacitor yields ~5µs off-time (~200kHz at VIN = 12V, VOUT = 5V). Frequency decreases as VIN − VOUT shrinks, preventing audible noise near dropout.
LTC1148CS-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 20V
- Frequency - Switching:
- Up to 250kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LTC1148CS-5#TRPBF FAQ
1.How can I place an order for LTC1148CS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148CS-5#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 LTC1148CS-5#TRPBF reliable?
The price and inventory of LTC1148CS-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1148CS-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1148CS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148CS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148CS-5#TRPBF?
LTC1148CS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148CS-5#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 LTC1148CS-5#TRPBF?
For technical support, including LTC1148CS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148CS-5#TRPBF requirements.
6.How does Aetrix verify that LTC1148CS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1148CS-5#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 LTC1148CS-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1148CS-5#TRPBF?
All LTC1148CS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148CS-5#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 LTC1148CS-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1148CS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1148CS-5#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
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…
