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Analog Devices Inc. LTC1148LCS#PBF
- Part No.:
- LTC1148LCS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148LCS#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,341
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Product details
Overview
LTC1148LCS#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external complementary MOSFETs in constant off-time current-mode architecture. It delivers up to 2A output current, achieves >95% peak efficiency at 5V output, maintains ultralow 160µA standby current in Burst Mode™, supports 3.5V–12V input range, and features adaptive nonoverlap gate drives for high-efficiency DC/DC conversion in battery-powered portable systems.
For engineers reviewing the LTC1148LCS#PBF datasheet, LTC1148LCS#PBF pinout, LTC1148LCS#PBF application, or LTC1148LCS#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency vs. load behavior, exact package mapping to 14-pin narrow SO, and two rigorously cross-checked alternative controllers for fixed-output synchronous buck designs.
Technical Context
The LTC1148LCS#PBF implements a constant off-time current-mode control architecture with automatic Burst Mode™ operation-switching between continuous conduction mode above ~300mA and low-frequency burst cycles below that threshold to sustain high efficiency across three decades of load current. Its off-time is set by an external CT capacitor and dynamically adjusted based on VOUT to stabilize frequency near dropout.
It integrates dual high-current gate drivers (P-DRIVE and N-DRIVE), internal 1.25V reference, current-sense comparator with 25mV–170mV programmable threshold, and logic-controlled micropower shutdown (<20µA). The device requires external P-channel and N-channel MOSFETs, current-sense resistor, inductor, and timing capacitor-no internal power switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous step-down controller (external MOSFETs required) |
| Input Voltage Range | 3.5V to 12V - enables direct operation from single Li-ion or 3-cell NiMH batteries |
| Feedback Reference | 1.25V ±4% - sets regulated output via external resistor divider or fixed internal divider |
| Current Sense Threshold | 25mV to 170mV - determines peak inductor current and maximum output capability |
| Standby Current | 160µA typical in Burst Mode™ - enables <2mW quiescent power at VIN = 10V, IOUT = 0 |
| Shutdown Current | 10µA to 22µA - ensures ultra-low leakage during system sleep states |
| Switching Frequency | Adjustable up to 250kHz via CT capacitor - higher frequencies reduce inductor size but increase gate losses |
| Operating Temperature | 0°C to 70°C ambient - commercial-grade rating suitable for handheld and portable instrumentation |
Pinout & Package
Package: 14-lead narrow SOIC (SO-14), 150 mil width, JEDEC MS-012AC, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current driver output | Drives gate of external P-channel MOSFET; swings from VIN to GND; requires low-inductance routing |
| NC (Pin 2) | No connection | Not internally bonded; may be tied to PGND or SGND per layout best practice |
| VIN (Pin 3) | Main supply input | Accepts 3.5V–12V input; must be decoupled with ≥1µF ceramic + bulk capacitor close to Pin 3 and PGND |
| CT (Pin 4) | Timing capacitor node | External capacitor (e.g., 390pF) sets off-time and operating frequency; discharge current scales with VOUT |
| INTVCC (Pin 5) | Internal LDO output | ~3.3V regulated supply for internal circuitry; must be decoupled to SGND with 1µF ceramic |
| ITH (Pin 6) | Current comparator threshold control | Voltage here modulates current-sense trip point; used for loop compensation with RC network |
| SENSE– (Pin 7) | Inverting current sense input | Connects to low-side of RSENSE; also serves as feedback node for fixed-output versions (LTC1148LCS#PBF) |
| SENSE+ (Pin 8) | Noninverting current sense input | Connects to high-side of RSENSE; built-in offset vs. Pin 7 sets current threshold |
| VFB (Pin 9) | Feedback input | Unused in LTC1148LCS#PBF (fixed 3.3V version); NC in this variant per datasheet footnote |
| SHUTDOWN (Pin 10) | Logic enable/disable input | 0V = active; >0.8V = shutdown; CMOS-compatible; must not float; pulls IQ < 22µA |
| SGND (Pin 11) | Small-signal ground | Reference for INTVCC, VFB, SENSE+, SENSE–; must be routed separately from PGND to COUT(–) |
| PGND (Pin 12) | Power ground return | Return path for VIN decoupling, N-DRIVE, and source of N-MOSFET; ties to CIN(–) and MOSFET source |
| NC (Pin 13) | No connection | Not internally bonded; may be tied to PGND or left unconnected |
| N-DRIVE (Pin 14) | High-current driver output | Drives gate of external N-channel MOSFET; swings from GND to VIN; high di/dt demands tight layout |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency (>95%) | Enabled by synchronous FET switching and Burst Mode™ operation-critical for extending battery runtime in portable devices |
| Adaptive nonoverlap gate drives | Prevents shoot-through by sensing P-DRIVE/N-DRIVE states-eliminates need for external dead-time circuitry |
| Very low dropout (100% duty cycle) | Supports regulation down to VIN – VOUT ≈ 0.2V-enables operation near battery end-of-discharge |
| Logic-controlled micropower shutdown | Reduces total system IQ to <22µA-essential for always-on subsystems and low-power wake-on-event designs |
| Wide input voltage range (3.5V–12V) | Accommodates single-cell Li-ion (3.0–4.2V), 3-cell NiMH (3.6–4.5V), or regulated 5V/12V rails without pre-regulation |
| Constant off-time current-mode control | Delivers stable ripple current and fast transient response independent of input/output voltage ratio |
Applications
| Portable Medical Instrumentation | Handheld Test Equipment |
|---|---|
|
Use Scenario: Battery-powered digital multimeter with LCD display, microcontroller, and analog front-end requiring clean 3.3V rail. IC Role / Device Role / Timing Role: Primary DC/DC controller generating regulated 3.3V from 3.7V Li-ion cell; manages light-load efficiency via Burst Mode™. Use Value: 160µA standby current extends battery life to >100 hours in sleep mode; synchronous topology avoids Schottky loss, improving thermal margin. |
Use Scenario: Portable oscilloscope with FPGA, ADC, and RF front-end needing stable 3.3V supply with minimal noise coupling. IC Role / Device Role / Timing Role: Fixed-output synchronous buck controller delivering 2A at 3.3V; uses external MOSFETs for optimal thermal distribution. Use Value: Adaptive nonoverlap prevents shoot-through-induced EMI; constant off-time architecture ensures consistent transient response across input voltage range. |
| GPS Navigation Receivers | Industrial Handheld Terminals |
|
Use Scenario: GPS module in automotive telematics unit powered by 12V vehicle bus with wide transients. IC Role / Device Role / Timing Role: Input-filtered step-down controller converting 12V to 3.3V for GPS baseband IC and RF synthesizer. Use Value: 12V max input rating and short-circuit protection ensure robustness against load dump; low dropout allows operation during cranking (6V min). |
Use Scenario: Ruggedized barcode scanner with backlight, imager, and Bluetooth radio operating from replaceable AA/AAA pack. IC Role / Device Role / Timing Role: High-efficiency 3.3V supply controller supporting dynamic load steps from 10mA (idle) to 1.8A (scan burst). Use Value: Current-mode control delivers <50µs recovery from 1A load step; Burst Mode™ maintains >85% efficiency at 10mA load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EMSE#PBF | Higher VIN max (36V), integrated MOSFET drivers with adjustable dead time, no Burst Mode™ - uses pulse-skipping at light loads | Better suited for 24V industrial inputs; lacks ultralow-IQ Burst Mode™ - less optimal for battery runtime-critical designs | Select when input exceeds 12V or when tighter dead-time control is needed; avoid if sub-20µA shutdown current is mandatory |
| TPS54202DDCR | Integrated high-side/low-side MOSFETs (2A), 3.5V–28V input, 1.5µA shutdown IQ, no Burst Mode™ - uses Eco-mode™ | Single-chip solution reduces BOM count; lower peak efficiency (~92%) than LTC1148LCS#PBF at 2A due to on-resistance losses | Choose for space-constrained designs where integration outweighs peak efficiency; verify thermal performance at full load |
Compared with LTC3866EMSE#PBF and TPS54202DDCR, the LTC1148LCS#PBF offers superior light-load efficiency via true Burst Mode™ and lowest shutdown IQ, but requires external MOSFETs and is limited to 12V input-making it ideal for compact, battery-optimized 3.3V systems where thermal headroom and runtime are prioritized over integration.
Availability
LTC1148LCS#PBF is available at Aetrix Electronics and suitable for portable medical instrumentation, handheld test equipment, GPS navigation receivers, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1148LCS#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, Inc. (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 and signal conditioning.
The LTC1148 series was designed specifically for high-efficiency, low-quiescent-current synchronous buck control in portable and battery-operated systems-emphasizing ultralow standby power, wide input flexibility, and robust gate drive for discrete MOSFET optimization.
FAQ
What is the output voltage configuration of the LTC1148LCS#PBF?
The LTC1148LCS#PBF is a fixed-output variant configured for 3.3V regulation. Its internal feedback divider connects SENSE– (Pin 7) to an internal 1.25V reference, eliminating the need for external resistors. This configuration is confirmed in the Electrical Characteristics table under "LTC1148L-3.3" and explicitly noted in the Pin Functions section where VFB (Pin 9) is marked NC for fixed versions. The device delivers 3.3V ±3% over temperature and line/load conditions.
Does the LTC1148LCS#PBF include internal power switches?
No, the LTC1148LCS#PBF is a controller-only IC and does not integrate power MOSFETs. It drives external complementary P-channel and N-channel MOSFETs via dedicated high-current P-DRIVE (Pin 1) and N-DRIVE (Pin 14) outputs. This architecture allows designers to select MOSFETs optimized for specific voltage, current, and thermal requirements-unlike integrated regulators such as the TPS54202DDCR.
What is the minimum input voltage supported by the LTC1148LCS#PBF?
The LTC1148LCS#PBF supports a minimum input voltage of 3.5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables for the "LTC1148L Series." This 3.5V rating enables reliable startup and regulation from partially discharged single-cell Li-ion batteries (down to ~3.4V under load) and is distinct from the standard LTC1148 series (min 3.5V* footnote applies only to L variants). Operation below 3.5V is not guaranteed.
How does Burst Mode™ operation improve efficiency at light loads?
Burst Mode™ in the LTC1148LCS#PBF reduces switching activity during low-load conditions by entering periodic sleep cycles-shutting down both gate drivers and most internal circuitry to cut quiescent current to 160µA. During each burst, only enough energy is delivered to maintain output regulation before returning to sleep. This eliminates switching losses dominant at light loads, sustaining >85% efficiency down to ~10mA-far exceeding conventional pulse-skipping modes.
Can the LTC1148LCS#PBF be used with a 5V output instead of 3.3V?
No-the LTC1148LCS#PBF is factory-trimmed for fixed 3.3V output and cannot be reconfigured for 5V. For 5V output, the pin-compatible LTC1148CS#PBF (or LTC1148CS-5) must be used. These variants share identical package, pinout, and controller architecture but differ in internal feedback divider ratios. Substituting LTC1148LCS#PBF in a 5V design will result in under-regulation (~3.3V output) and potential system malfunction.
LTC1148LCS#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
LTC1148LCS#PBF FAQ
1.How can I place an order for LTC1148LCS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148LCS#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 LTC1148LCS#PBF reliable?
The price and inventory of LTC1148LCS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1148LCS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148LCS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148LCS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148LCS#PBF?
LTC1148LCS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148LCS#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 LTC1148LCS#PBF?
For technical support, including LTC1148LCS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148LCS#PBF requirements.
6.How does Aetrix verify that LTC1148LCS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148LCS#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 LTC1148LCS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148LCS#PBF?
All LTC1148LCS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148LCS#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 LTC1148LCS#PBF part is unused and in its original packaging.
Return procedure for LTC1148LCS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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