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Analog Devices Inc. LTC1148CS#PBF
- Part No.:
- LTC1148CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148CS#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:169
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Product details
Overview
LTC1148CS#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external complementary MOSFETs to deliver regulated 5V output at up to 2A load current. It features constant off-time current-mode architecture, Burst Mode™ operation for ultralow quiescent current (160 µA), and adaptive nonoverlap gate drives-enabling >95% efficiency at 1A with VIN = 6V in portable instrumentation power supplies.
For engineers reviewing the LTC1148CS#PBF datasheet, LTC1148CS#PBF pinout, LTC1148CS#PBF application, or LTC1148CS#PBF equivalent, this page delivers verified package mapping (14-pin narrow SO), confirmed pin functions (e.g., P-DRIVE, N-DRIVE, SENSE+, SENSE−), exact feedback voltage (1.25 V), and validated alternatives for battery-powered DC/DC conversion where high light-load efficiency and 3.5V–20V input range are critical.
Technical Context
The LTC1148CS#PBF implements a constant off-time current-mode control architecture with user-programmable peak inductor current via external RSENSE. Its internal 1.25 V reference and precision current sense comparator (125–175 mV threshold) enable tight output regulation across line and load variations.
Burst Mode™ operation automatically engages below ~300 mA load, disabling switching and reducing IQ to 160 µA while maintaining regulation via output capacitor discharge. Adaptive nonoverlap circuitry prevents shoot-through by enforcing sequencing between P-DRIVE and N-DRIVE outputs, independent of external MOSFET gate delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V (LTC1148CS#PBF is the -5 variant; VOUT = 4.90–5.20 V at 700 mA) |
| Input Voltage Range | 3.5 V to 20 V - supports single-cell Li-ion to 18 V rail inputs with 20 V absolute max |
| Quiescent Current | 160 µA in Sleep Mode - enables >1000-hour battery life in always-on portable instruments |
| Shutdown Current | <20 µA - ensures negligible drain during system standby |
| Current Sense Threshold | 125–175 mV - sets peak inductor current; determines max output current via RSENSE |
| Feedback Reference | 1.25 V ±2% - stable internal reference used with external divider or fixed-output internal network |
| Off-Time Range | 3.8–6 µs (CT = 390 pF) - defines minimum switch-off duration and governs frequency vs. VIN–VOUT |
Pinout & Package
Package: 14-lead narrow SOIC (SO-14), 150 mil width, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current gate driver output | Drives P-channel MOSFET source; swings from VIN to GND; requires low-inductance layout |
| NC (Pin 2) | No connection | May be tied to PGND or SGND per layout best practice; no internal function |
| VIN (Pin 3) | Main supply input | Accepts 3.5–20 V; must be decoupled locally to PGND with ≥1 µF ceramic + bulk capacitor |
| CT (Pin 4) | Timing capacitor node | Sets off-time and operating frequency; discharge current scales with VOUT |
| INTVCC (Pin 5) | Internal 3.3 V regulator output | Supplies internal circuitry; decouple to SGND with 1 µF ceramic; do not load externally |
| ITH (Pin 6) | Gain amplifier compensation point | Adjusts current comparator threshold; external RC network provides loop stability |
| SENSE− (Pin 7) | Current sense (−) input / internal VOUT divider tap | In LTC1148CS#PBF (-5), connects to internal resistive divider setting 5 V output |
| SENSE+ (Pin 8) | Current sense (+) input | Connects across RSENSE; built-in offset vs. Pin 7 sets trip threshold (125–175 mV) |
| VFB (Pin 9) | Feedback input (adjustable version only) | Not connected in LTC1148CS#PBF; NC in fixed-output variants |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | <0.8 V = active; >1.5 V = shutdown; CMOS-compatible; tR/tF < 1 µs required |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND to COUT(−); avoids noise coupling into feedback path |
| PGND (Pin 12) | Power ground return | Connects to N-MOSFET source and CIN(−); high di/dt node requiring short, wide trace |
| NC (Pin 13) | No connection | May be tied to PGND or SGND; no internal function |
| N-DRIVE (Pin 14) | High-current gate driver output | Drives N-channel MOSFET source; swings from GND to VIN; matched drive strength to Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency (>95%) | Enabled by synchronous FET switching and Burst Mode™ - eliminates diode losses and reduces switching loss at light loads |
| Adaptive nonoverlap gate drives | Prevents shoot-through without external timing components - ensures safe dead-time between P- and N-drive transitions |
| Very low dropout (100% duty cycle) | Supports operation down to VIN ≈ VOUT + 0.3 V - extends battery runtime in deep-discharge conditions |
| Logic-controlled micropower shutdown | IQ < 20 µA - allows host MCU to disable regulator with minimal system-level leakage |
| Short-circuit protection | Automatic tOFF extension during overload - limits average short-circuit current to ~IMAX without latch-up |
Applications
| Portable Instrumentation Power | Battery-Powered GPS Receivers |
|---|---|
|
Use Scenario: Handheld multimeter or data logger powered by two AA alkaline cells (2.4–3.2 V) boosted to 5 V rail for microcontroller and ADC. IC Role / Device Role / Timing Role: Controller for synchronous buck converter delivering regulated 5 V at up to 2 A with <160 µA quiescent draw during sleep mode. Use Value: Extends battery life beyond 1000 hours in measurement standby while supporting fast wake-up and full-load transient response. |
Use Scenario: GPS module in wearable tracker using single-cell Li-ion (3.0–4.2 V) input to generate clean 5 V for RF front-end and baseband IC. IC Role / Device Role / Timing Role: Constant off-time current-mode controller enabling stable regulation across wide input range and low-noise output under bursty RF load. Use Value: Maintains >90% efficiency at 100 mA (GPS acquisition) and >94% at 500 mA (active tracking), minimizing thermal rise in sealed enclosure. |
| Notebook Subsystem Supply | DC Power Distribution in Field Instruments |
|
Use Scenario: Secondary 5 V rail in industrial tablet for USB peripherals and display backlight, derived from 12 V main bus. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller with programmable current limit and robust short-circuit recovery. Use Value: Delivers 2 A continuous output with <60 mV load regulation and no need for external current-sense amplifier or protection IC. |
Use Scenario: Distributed 5 V supply in modular sensor node with multiple analog front-ends and isolated CAN transceivers. IC Role / Device Role / Timing Role: Primary DC/DC controller providing tightly regulated, low-ripple 5 V with separate SGND/PGND routing for mixed-signal integrity. Use Value: Enables <±0.5% output accuracy over –40°C to 85°C and supports remote shutdown coordination across multi-board systems. |
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#PBF | Integrated power MOSFETs (no external FETs required); higher IQ (2.5 mA normal mode); fixed 5 V output | Better for space-constrained designs needing lower BOM count; less flexible for high-current or custom FET selection | Choose LT3502AEDD#PBF when board area is critical and 1.5 A max output suffices; LTC1148CS#PBF preferred for >2 A or thermal optimization with discrete FETs |
| TPS54202DDCR | Internal FETs; 4.5–28 V input; 2 A output; integrated soft-start; no Burst Mode™ - uses pulse-skipping instead | Higher input voltage support; simpler layout; but 25 µA shutdown vs. 20 µA, and lower light-load efficiency (<85% at 10 mA) | Choose TPS54202DDCR for 24 V industrial input rails; LTC1148CS#PBF remains superior for battery-powered apps demanding sub-20 µA shutdown and >95% efficiency at 100 mA |
Compared with LT3502AEDD#PBF and TPS54202DDCR, the LTC1148CS#PBF offers unique advantages in ultra-low-quiescent operation and external FET flexibility-enabling optimized thermal design and extended battery life in portable instrumentation, whereas the alternatives trade control granularity for integration or input voltage range.
Availability
LTC1148CS#PBF is available at Aetrix Electronics and suitable for portable instrumentation power, battery-powered GPS receivers, and notebook subsystem supply requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1148CS#PBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors with deep expertise in precision power conversion.
The LTC1148 series belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for battery-operated and portable systems demanding ultralow quiescent current, wide input range, and synchronous efficiency without integrated FETs.
FAQ
What is the output voltage configuration of the LTC1148CS#PBF?
The LTC1148CS#PBF is the fixed 5 V output variant of the LTC1148 family. Its internal resistive divider on SENSE− (Pin 7) and SENSE+ (Pin 8) sets VOUT to 4.90–5.20 V at 700 mA load, eliminating the need for external feedback resistors. This differs from the adjustable LTC1148 (which uses VFB on Pin 9) and the 3.3 V variant LTC1148CS-3.3.
Does the LTC1148CS#PBF require external MOSFETs, and what types are recommended?
Yes, the LTC1148CS#PBF is a controller-only device and requires external complementary P-channel and N-channel MOSFETs. For VIN ≤ 8 V, logic-level P-MOSFETs (VGS(TH) < 2.5 V) and N-MOSFETs are recommended; for higher VIN, standard-threshold devices suffice. The datasheet specifies Si4431DY (P) and Si4412DY (N) as validated examples with appropriate RDS(ON) and gate charge.
How does Burst Mode™ operation improve efficiency in the LTC1148CS#PBF?
Burst Mode™ in the LTC1148CS#PBF disables switching and reduces quiescent current to 160 µA when load drops below ~300 mA, maintaining regulation solely via output capacitor discharge. This avoids switching losses dominant at light loads, enabling >90% efficiency at 10 mA and >95% at 1 A - critical for battery longevity in always-on portable instruments.
What is the maximum continuous output current supported by the LTC1148CS#PBF?
The LTC1148CS#PBF itself does not deliver current - it controls external MOSFETs. With properly selected FETs (e.g., Si4431DY/Si4412DY), typical designs achieve 2 A continuous output. The current limit is set by RSENSE and the 125–175 mV sense threshold; for 2 A, RSENSE = 0.05 Ω yields ISC(PK) ≈ 3 A and IBURST ≈ 300 mA, matching the datasheet's validated performance.
Can the LTC1148CS#PBF operate with input voltages below 3.5 V?
No - the absolute minimum input voltage for the LTC1148CS#PBF is 3.5 V, as specified in the Electrical Characteristics table for the LTC1148L series (which shares the same SOIC package and pinout). Operation below 3.5 V risks failure to start or regulate; for sub-3.5 V inputs, consider the LTC3620 or LTC3630 families instead.
LTC1148CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1148CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148CS#PBF 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#PBF reliable?
The price and inventory of LTC1148CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1148CS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148CS#PBF?
LTC1148CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148CS#PBF 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#PBF?
For technical support, including LTC1148CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148CS#PBF requirements.
6.How does Aetrix verify that LTC1148CS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148CS#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148CS#PBF?
All LTC1148CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148CS#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1148CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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