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Semtech Corporation SC198AMLTRT
- Part No.:
- SC198AMLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SC198AMLTRT.pdf
- Description:
- IC REG BUCK PROG 800MA DL 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:1,707
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Product details
Overview
SC198AMLTRT from Semtech is a dual synchronous step-down DC-DC converter in a 4mm × 4mm MLPQ-20 package, delivering up to 800mA per channel with independent programmable output voltages (1.0V–3.3V), fixed 1MHz switching frequency, and <1μA shutdown current. It serves as a compact, high-efficiency power supply for microprocessor core and I/O rails in portable battery-powered devices.
For engineers reviewing the SC198AMLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include dual-channel independent voltage programming via CTLx pins, PSAVE mode efficiency optimization at light loads, thermal shutdown at 145°C, and compatibility with 4.7μH inductors and 10μF ceramic output capacitors.
Technical Context
The SC198AMLTRT integrates two independent buck regulators sharing a single control logic block but supporting separate enable (ENA/ENB), voltage select (CTLA0–2 / CTLB0–2), and feedback paths. Each channel operates in continuous conduction mode with internal synchronous rectification-eliminating external Schottky diodes.
It supports three operating modes: forced PWM (MODE/SYNC = VIN), power-save (MODE/SYNC = GND), and external clock synchronization (MODE/SYNC = external 0.75–1.25MHz signal). Protection includes thermal shutdown with 10°C hysteresis, cycle-by-cycle current limiting (1.2A peak), over-voltage lockout, and soft-start with controlled in-rush current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li-ion or triple NiMH/NiCd cells without pre-regulation. |
| Output Current per Channel | Up to 800mA - sufficient for microprocessor cores and peripheral I/O rails in handheld devices. |
| Switching Frequency | 1MHz (±10%) - enables use of small 4.7μH inductors and reduces output filter footprint. |
| Output Voltage Options | Eight programmable levels per channel (1.0V–3.3V) - selected via 3-pin binary encoding, eliminating external resistive dividers. |
| Efficiency Peak | Over 90% - achieved at mid-load under PWM mode, critical for battery runtime extension. |
| Shutdown Current | <1μA - minimizes battery drain during system sleep states. |
| Thermal Shutdown Threshold | 145°C with 10°C hysteresis - protects silicon integrity during sustained high-power operation on compact PCBs. |
Pinout & Package
SC198AMLTRT is housed in a thermally enhanced 4mm × 4mm MLPQ-20 package with exposed thermal pad (T) requiring connection to ground plane via multiple vias. Pin count is 20, including dedicated input (VINA/VINB/VINR), output (VOUTA/VOUTB), inductor (LXA/LXB), ground (GNDA/GNDB/GNDR), enable (ENA/ENB), mode/sync (MODE/SYNC), and three voltage-select control pins per channel (CTLA0–2 / CTLB0–2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VINA | Input supply for Channel A | Accepts 2.7–5.5V; must be decoupled locally with ≥4.7μF ceramic capacitor. |
| 2 LXA | Inductor switch node for Channel A | Connects to 4.7μH inductor; high dv/dt node requiring short, low-inductance trace routing. |
| 3 GNDA | Power ground return for Channel A | Separate ground path prevents noise coupling between channels; ties to main ground plane under thermal pad. |
| 4 VOUTA | Feedback input for Channel A regulation | Internally connected to precision voltage divider; no external resistor network required. |
| 5–7 CTLA0–2 | Binary voltage select inputs for Channel A | Set one of eight output voltages (1.0V–1.8V); must be hard-wired high/low-no floating allowed. |
| 8 GNDR | Reference supply ground | Ground reference for internal voltage references; requires low-impedance connection to GNDA/GNDB. |
| 9–11 CTLB2–0 | Binary voltage select inputs for Channel B | Independent of Channel A; enables asymmetric rail generation (e.g., 1.2V core + 3.3V I/O). |
| 12 VOUTB | Feedback input for Channel B regulation | Same internal architecture as VOUTA; supports simultaneous dual-rail regulation. |
| 13 GNDB | Power ground return for Channel B | Isolated ground path maintains regulation accuracy under dynamic load imbalance. |
| 14 LXB | Inductor switch node for Channel B | Functionally identical to LXA; layout symmetry recommended for EMI reduction. |
| 15 VINB | Input supply for Channel B | May be tied to VINA or powered separately for rail isolation in noise-sensitive designs. |
| 16 ENB | Enable input for Channel B | Active-high logic; allows independent sequencing of Channel B relative to Channel A. |
| 17 MODE/SYNC | Oscillator control and sync input | Pulled to VIN for PWM, GND for PSAVE, or driven externally for synchronized multi-rail systems. |
| 18 VINR | Reference supply input | Must be ≥2.7V; powers internal bandgap and error amplifiers; bypassed with 1μF ceramic. |
| 19 NC | No-connect terminal | Not internally bonded; must remain unconnected and unstubbed on PCB. |
| 20 ENA | Enable input for Channel A | Enables/disables Channel A independently; supports staggered power-up sequences. |
| T Thermal Pad | Exposed copper thermal interface | Electrically connected to GNDA/GNDB/GNDR; requires ≥6 thermal vias to inner ground plane for θJA = 31°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulation | Two fully functional converters sharing control logic but supporting separate enable, voltage select, and feedback-enabling asymmetric rail generation without discrete ICs. |
| Programmable output voltage (8 options) | Voltage set by 3-pin binary code per channel eliminates external resistor dividers, reducing BOM count and layout area while enabling firmware-configurable rail tuning. |
| PSAVE mode with automatic load detection | Enters burst-mode operation below ~50mA load to maintain >85% efficiency at light loads-critical for standby power in always-on portable devices. |
| Integrated synchronous rectification | Eliminates need for external Schottky diodes, reducing component count, board space, and conduction losses-improving efficiency by ~5% vs. asynchronous designs. |
| Comprehensive protection suite | Includes thermal shutdown (145°C), cycle-by-cycle current limit (1.2A), over-voltage lockout, and soft-start-ensuring robust operation across battery voltage sag and transient load steps. |
Applications
| Mobile Handset Power Management | Digital Camera Core/I/O Rails |
|---|---|
|
Use Scenario: Dual-rail power delivery for application processor (core voltage) and image sensor interface (I/O voltage) in slim smartphone form factors. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing tightly regulated, independently programmable 1.2V core and 2.8V I/O supplies with fast transient response. Use Value: Reduces total power solution footprint by 40% versus discrete buck converters while maintaining <±3% output accuracy across -40°C to +85°C. |
Use Scenario: Simultaneous power conversion for CMOS image sensor analog front-end (1.8V) and digital controller (3.3V) in compact digital cameras. IC Role / Device Role / Timing Role: Dual-channel synchronous buck supplying stable, low-noise rails with independent enable sequencing to manage startup current surges. Use Value: Achieves >90% efficiency at 300mA load per rail, extending battery life by 22% compared to linear regulators in burst-capture mode. |
| Portable Gaming System SoC Supply | DMB Receiver Baseband Processing |
|
Use Scenario: Powering ARM-based application SoC with dynamic voltage scaling requirements in handheld gaming consoles. IC Role / Device Role / Timing Role: Programmable dual-buck delivering 1.0V–1.6V core and 1.8V memory rails, with PSAVE mode active during menu navigation idle periods. Use Value: Enables 15% longer gameplay time by maintaining >87% efficiency at 20mA load via automatic PSAVE entry/exit without firmware intervention. |
Use Scenario: Generating clean, low-noise power rails for DMB demodulator ICs and baseband processors in mobile TV receivers. IC Role / Device Role / Timing Role: Dual-output converter supplying 1.2V RF front-end and 2.5V digital processing rails with minimal crosstalk (<50mV) in PSAVE mode. Use Value: Meets stringent EMI requirements for broadcast reception by suppressing switching noise through synchronized MODE/SYNC operation with system clock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple-output PMIC (2 buck + 1 LDO); 3MHz switching; smaller 4×4 QFN but no PSAVE mode. | Better suited for systems requiring integrated LDOs and higher-frequency operation; lacks independent voltage-select flexibility per buck channel. | Select when needing mixed buck/LDO outputs and faster transient response, accepting higher quiescent current (25μA vs. SC198AMLTRT's 50μA active, <1μA shutdown). |
| RT8059ZSP | Dual buck with 2.5MHz switching; 600mA per channel; fixed 1.2V/3.3V outputs; no programmable voltage select. | Optimized for cost-sensitive, fixed-rail applications like basic PDAs; no CTL pin programming or PSAVE mode. | Choose for simple dual-rail needs where voltage flexibility and ultra-low shutdown current are not required-reduces design complexity but sacrifices configurability. |
Compared with TPS65023RSBR and RT8059ZSP, SC198AMLTRT uniquely balances programmable voltage selection, ultra-low shutdown current, and PSAVE efficiency optimization-making it optimal for battery-constrained portable devices requiring firmware-tunable rails and long standby life.
Availability
SC198AMLTRT is available at Aetrix Electronics and suitable for mobile handsets, digital cameras, portable gaming systems, and DMB receivers requiring stable component supply with full lifecycle support.
Supply support for SC198AMLTRT 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, sensing, and connectivity markets.
The SC198AMLTRT belongs to Semtech's Power Management Products Division portfolio, designed specifically for space-constrained, battery-operated consumer electronics requiring dual independent high-efficiency DC-DC conversion with minimal external components.
FAQ
What is the maximum supported inductor value for stable operation of SC198AMLTRT?
The SC198AMLTRT is optimized for 4.7μH inductors as specified in the datasheet and typical application circuit. While larger values may improve ripple current, they risk violating the internal compensation design-especially with the fixed single-pole loop compensation tuned for L = 4.7μH and COUT = 10μF. Using inductors significantly above 4.7μH can cause instability or degraded transient response. The SC198AMLTRT datasheet explicitly recommends 4.7μH as the practical lower limit for stability; deviation requires re-evaluation of LC corner frequency against internal compensation.
Can SC198AMLTRT operate with only one channel enabled while the other remains powered down?
Yes, SC198AMLTRT supports independent channel control: ENA and ENB are separate logic inputs, allowing Channel A or B to be disabled while the other remains active. When one channel is disabled, its associated CTL pins retain their programmed voltage setting, and the LX node enters high-impedance state. The enabled channel continues full regulation-including PSAVE mode entry/exit-without performance degradation. This capability is confirmed in the Pin Descriptions table and Block Diagram, where ENA and ENB drive distinct control paths within the shared logic block.
Does SC198AMLTRT require external compensation components for loop stability?
No, SC198AMLTRT features fully internal loop compensation designed to work with a standard output filter using L = 4.7μH and COUT = 10μF. The internal compensation network is fixed and not user-adjustable; the datasheet explicitly states "The SC198A converter also has internal loop compensation" and warns that deviating significantly from the recommended LC product may impact stability. Therefore, no external compensation components (e.g., RC networks or type-II/III compensators) are needed or supported for SC198AMLTRT.
What is the minimum input voltage required for SC198AMLTRT to regulate a 3.3V output?
The SC198AMLTRT requires a minimum input voltage of 4.0V to regulate a 3.3V output, as specified in the Electrical Characteristics table under "Input Voltage Range." This is due to dropout constraints of the synchronous buck architecture-specifically, the sum of NMOS RDS(on) drop, PMOS RDS(on) drop, and control overhead necessitates VIN ≥ VOUT + ~0.7V. At VIN < 4.0V, regulation fails and VOUT collapses; the device does not enter dropout mode but instead ceases switching or triggers UVLO (2.4–2.6V threshold) if VIN drops further.
How does the SC198AMLTRT handle output over-voltage events?
SC198AMLTRT implements over-voltage protection (OVP) that disables PWM drive when output voltage exceeds regulation by >2%, tri-stating the LX output to prevent damage to downstream circuitry. Recovery occurs only after VOUT falls below the OVP threshold-no automatic restart or latch-off behavior is present. This protection is active in both PWM and PSAVE modes and is documented in the "Protection Features" section of the datasheet. The OVP circuit operates independently of thermal or current limits and responds within microseconds to fast transients.
SC198AMLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V, 1.8V
- Voltage - Output (Max):
- 1.8V, 3.3V
- Current - Output:
- 800mA
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ (4x4)
SC198AMLTRT FAQ
1.How can I place an order for SC198AMLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC198AMLTRT 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 SC198AMLTRT reliable?
The price and inventory of SC198AMLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC198AMLTRT is usually 5 days.
3.What payment methods are accepted for SC198AMLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC198AMLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC198AMLTRT?
SC198AMLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC198AMLTRT 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 SC198AMLTRT?
For technical support, including SC198AMLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC198AMLTRT requirements.
6.How does Aetrix verify that SC198AMLTRT is sourced from the original manufacturer or authorized distributors?
All SC198AMLTRT 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 SC198AMLTRT meets industry standards.
7.What is the process for return or replacement of SC198AMLTRT?
All SC198AMLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC198AMLTRT, 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 SC198AMLTRT part is unused and in its original packaging.
Return procedure for SC198AMLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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