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Analog Devices Inc. LTC1148HVCS-5#PBF
- Part No.:
- LTC1148HVCS-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148HVCS-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
LTC1148HVCS-5#PBF from Analog Devices (formerly Linear Technology) is a high-voltage 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, 3.5V–20V input range, and adaptive nonoverlap gate drives - used in battery-powered portable instrumentation requiring stable 5V rail generation from wide-input sources.
For engineers reviewing the LTC1148HVCS-5#PBF datasheet, LTC1148HVCS-5#PBF pinout, LTC1148HVCS-5#PBF application, or LTC1148HVCS-5#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed 14-pin narrow SO package mapping, real-world efficiency vs. load curves, and two rigorously cross-checked alternative controllers for 5V synchronous buck designs.
Technical Context
The LTC1148HVCS-5#PBF implements a constant off-time current-mode control architecture with automatic Burst Mode™ operation to sustain >90% efficiency from 0mA to 2A output load. Its off-time is set by an external CT capacitor and dynamically scaled with VOUT to maintain stable frequency across input voltage variations.
It integrates dual high-current gate drivers (P-DRIVE and N-DRIVE), internal 1.25V reference, programmable current-sense threshold (125–175mV), and logic-controlled micropower shutdown (IQ < 22µA). The device supports 100% duty-cycle low-dropout operation and includes adaptive nonoverlap timing to prevent shoot-through in external MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (±1.5% over temp/load); no external feedback divider required. |
| Input Voltage Range | 3.5V to 20V - enables direct operation from 12V/15V industrial rails or 2S Li-ion batteries. |
| Efficiency | ≥95% at 1A, VIN = 10V - achieved via synchronous FET switching and Burst Mode™ optimization. |
| Quiescent Current | 160–250µA in Sleep Mode - sustains >100-hour runtime in always-on portable instruments. |
| Shutdown Current | <22µA - reduces system standby power to sub-200µW level at VIN = 10V. |
| Current Sense Threshold | 125–175mV - sets peak inductor current; determines max output (e.g., RSENSE = 0.05Ω → IMAX ≈ 2A). |
| Switching Frequency | ~250kHz typical (CT = 390pF) - balances EMI, MOSFET loss, and inductor size for compact designs. |
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 P-channel MOSFET gate driver | Swings from VIN to GND; drives top switch with fast edge (100–200ns) and adaptive dead-time control. |
| NC (Pin 2) | No connection | Internally unconnected; may be tied to PGND or left floating per layout best practice. |
| VIN (Pin 3) | Main power supply input | Accepts 3.5V–20V; requires local 1µF ceramic + bulk capacitor decoupling to PGND. |
| CT (Pin 4) | Timing capacitor connection | Sets off-time and operating frequency; discharge current scales with VOUT for stable regulation. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Supplies internal circuitry; must be decoupled to SGND with ≥1µF ceramic, not externally loaded. |
| ITH (Pin 6) | Current comparator threshold control | Voltage here modulates current-sense trip point to track load; used for loop compensation. |
| SENSE– (Pin 7) | Inverting input of current comparator & internal VOUT divider tap | Connects to shunt resistor low-side; also sets 5V output via internal 1.25V reference × 4 ratio. |
| SENSE+ (Pin 8) | Noninverting input of current comparator | Connects to shunt resistor high-side; built-in offset vs. Pin 7 defines 125–175mV current threshold. |
| VFB (Pin 9) | Feedback input (adjustable version only) | Not connected on LTC1148HVCS-5#PBF; internally tied off - fixed 5V output uses SENSE–/SENSE+ path. |
| SHUTDOWN (Pin 10) | Logic-enable control input | 0V = active; >0.8V = shutdown; CMOS-compatible, <5µA input leakage, tR/tF < 1µs required. |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND to COUT(–); critical for noise immunity and regulation accuracy. |
| PGND (Pin 12) | Power ground return | Connects to N-MOSFET source and CIN(–); carries high di/dt switching currents - keep short and wide. |
| NC (Pin 13) | No connection | Internally unconnected; may be tied to PGND or left floating. |
| N-DRIVE (Pin 14) | High-current N-channel MOSFET gate driver | Swings from GND to VIN; complements P-DRIVE with matched drive strength and nonoverlap timing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency | Over 95% achievable at 1A due to synchronous FET switching and Burst Mode™ elimination of switching losses at light loads. |
| Wide input range | 3.5V–20V operation supports 2S/3S Li-ion, 12V automotive, and industrial DC distribution without pre-regulation. |
| Adaptive nonoverlap gate drives | Hardware-enforced dead time prevents shoot-through in external P/N-MOSFET pair - no external timing components needed. |
| Low dropout capability | 100% duty cycle operation allows regulation down to VIN – VOUT ≈ 0.2V (limited only by RDS(ON) and inductor DCR). |
| Burst Mode™ operation | Reduces IQ to 160µA while maintaining ±1% output regulation - extends battery life in portable instruments and GPS systems. |
Applications
| Portable Instrumentation | Battery-Powered GPS Receivers |
|---|---|
|
Use Scenario: Handheld multimeter or thermal imager powered by 2S Li-ion (6–8.4V) requiring clean, efficient 5V rail for MCU and analog front-end. IC Role / Device Role / Timing Role: Controller for synchronous buck converter delivering regulated 5V at up to 2A with minimal heat rise in sealed enclosure. Use Value: 95% efficiency at 1A and 160µA sleep current enable >12-hour runtime; Burst Mode™ eliminates audible switching noise during measurement pauses. |
Use Scenario: Automotive-grade GPS module operating from 9–16V vehicle supply, needing robust 5V output with cold-crank tolerance. IC Role / Device Role / Timing Role: High-voltage synchronous buck controller enabling direct 12V-to-5V conversion without intermediate 5V LDO stage. Use Value: 20V absolute max rating and short-circuit protection ensure survival during load dump transients; 100% duty cycle maintains 5V output down to 5.2V input. |
| Cellular Baseband Power Supply | Industrial DC Distribution Node |
|
Use Scenario: LTE modem subsystem requiring tightly regulated 5V at 1.5A peak, with rapid load transient response during RF transmission bursts. IC Role / Device Role / Timing Role: Constant off-time current-mode controller providing excellent line/load transient response (<50µs recovery) via direct inductor current sensing. Use Value: Adaptive nonoverlap timing and 125–175mV current threshold allow precise peak-current limiting; ITH pin enables optimized loop compensation for 10A/µs load steps. |
Use Scenario: DIN-rail mounted IoT gateway converting 24VDC field supply to isolated 5V for microcontroller, Ethernet PHY, and sensor interface. IC Role / Device Role / Timing Role: Primary 24V-to-5V buck controller in non-isolated auxiliary supply, paired with discrete MOSFETs rated for 30V VDS. Use Value: Wide 3.5–20V input range accommodates brownout conditions; shutdown pin enables remote power cycling via PLC I/O signal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | Integrated power MOSFETs (3A), higher 42V VIN max, Silent Switcher® architecture, fixed 5V option available. | Eliminates external FETs and reduces BOM count; better EMI performance but larger solution size and higher cost. | Choose LT8610EMSE#PBF when board space is constrained and integrated FETs simplify design; LTC1148HVCS-5#PBF preferred when thermal management demands discrete FET selection. |
| TPS54202DDCR | Integrated 2A FETs, 3–28V input, 500kHz fixed frequency, no Burst Mode™ - uses pulse-skipping at light load. | Lower quiescent current (2µA shutdown) but lower peak efficiency (92% at 1A); lacks adaptive nonoverlap and 100% duty cycle. | Choose TPS54202DDCR for cost-sensitive, moderate-efficiency applications where 160µA sleep current is not mandatory; LTC1148HVCS-5#PBF remains superior for ultra-low-power portable use. |
Compared with LT8610EMSE#PBF and TPS54202DDCR, the LTC1148HVCS-5#PBF offers unique advantages in ultralow-light-load IQ, true 100% duty cycle dropout, and hardware-enforced nonoverlap - making it optimal for battery longevity and wide-input industrial converters where discrete FET optimization is valuable.
Availability
LTC1148HVCS-5#PBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered GPS receivers, cellular baseband supplies, and industrial DC distribution nodes requiring stable component supply with long lifecycle support.
Supply support for LTC1148HVCS-5#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 ICs, serving precision, industrial, automotive, and communications markets.
The LTC1148HV series belongs to Linear's legacy high-voltage synchronous buck controller product line, designed specifically for efficiency-critical, wide-input-range DC/DC conversion in portable and industrial equipment where discrete MOSFET optimization is essential.
FAQ
What is the maximum input voltage rating for the LTC1148HVCS-5#PBF?
The LTC1148HVCS-5#PBF has an absolute maximum input voltage rating of 20V on the VIN pin (Pin 3), with recommended operating range from 3.5V to 18V. This distinguishes it from standard LTC1148 variants (16V max) and enables reliable operation from 12V industrial rails or 3S Li-ion batteries. Exceeding 20V risks permanent damage per Absolute Maximum Ratings table.
Does the LTC1148HVCS-5#PBF require external feedback resistors to set the 5V output?
No - the LTC1148HVCS-5#PBF is a fixed-output variant with internal resistor divider network connecting SENSE– (Pin 7) to the 1.25V reference, yielding a nominal 5.05V output. Pins 9 (VFB) and 2/13 (NC) are unused; external feedback resistors are only required for adjustable versions like LTC1148HVCS.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1148HVCS-5#PBF?
Burst Mode™ in the LTC1148HVCS-5#PBF disables switching and places both gate drivers in high-impedance state when output voltage reaches regulation, reducing input supply current to 160–250µA. The controller wakes only when output droops by comparator hysteresis, delivering a burst of pulses to recharge COUT - sustaining >90% efficiency down to 1mA load while eliminating audible noise.
What is the purpose of the ITH pin (Pin 6) on the LTC1148HVCS-5#PBF?
The ITH pin (Pin 6) on the LTC1148HVCS-5#PBF serves as the gain amplifier decoupling node and directly controls the current comparator threshold voltage. Its voltage modulates the 125–175mV sense threshold to track load changes; adding an RC network here provides loop compensation to stabilize the current-mode control loop against output capacitor ESR variations.
Can the LTC1148HVCS-5#PBF operate in 100% duty cycle mode, and under what conditions?
Yes - the LTC1148HVCS-5#PBF supports true 100% duty cycle operation when VIN approaches VOUT, enabling ultra-low dropout regulation. This occurs automatically when (VIN – VOUT) falls below ~1.5V; the off-time controller reduces tOFF to maintain regulation, limited only by external P-MOSFET RDS(ON), inductor DCR, and sense resistor value.
LTC1148HVCS-5#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
LTC1148HVCS-5#PBF FAQ
1.How can I place an order for LTC1148HVCS-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148HVCS-5#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 LTC1148HVCS-5#PBF reliable?
The price and inventory of LTC1148HVCS-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1148HVCS-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148HVCS-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148HVCS-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148HVCS-5#PBF?
LTC1148HVCS-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148HVCS-5#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 LTC1148HVCS-5#PBF?
For technical support, including LTC1148HVCS-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148HVCS-5#PBF requirements.
6.How does Aetrix verify that LTC1148HVCS-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148HVCS-5#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 LTC1148HVCS-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148HVCS-5#PBF?
All LTC1148HVCS-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148HVCS-5#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 LTC1148HVCS-5#PBF part is unused and in its original packaging.
Return procedure for LTC1148HVCS-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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