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LM1771SSD/NOPB
Texas Instruments
IC REG CTRLR BUCK 6WSON
6020 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 6-WSON (3x3)
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (400 Ratings)
LM1771SSD/NOPB
Product Overview
1276106
DiGi Electronics Part Number
LM1771SSD/NOPB-DGManufacturer
Texas Instruments
LM1771SSD/NOPB
Description
IC REG CTRLR BUCK 6WSONInventory
6020 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 6-WSON (3x3)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM1771SSD/NOPB Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
Tape & Reel (TR)
Series
-
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)
2.8V ~ 5.5V
Frequency - Switching
100kHz ~ 1MHz
Duty Cycle (Max)
-
Synchronous Rectifier
Yes
Clock Sync
No
Serial Interfaces
-
Control Features
Enable
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
6-WDFN Exposed Pad
Supplier Device Package
6-WSON (3x3)
Base Product Number
LM1771
Datasheet & Documents
HTML Datasheet
LM1771SSD/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
-LM1771SSD-NDR
LM1771SSDTR
LM1771SSD/NOPBCT
LM1771SSDCT-DG
NATNSCLM1771SSD/NOPB
*LM1771SSD/NOPB
LM1771SSDCT
LM1771SSDTR-DG
LM1771SSD/NOPBTR
2156-LM1771SSD/NOPB-TI
LM1771SSDNOPB
-LM1771SSD/NOPBCT-DG
Standard Package
1,000
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
믿을 수 있는 업체로 언제나 만족스러운 거래를 하고 있습니다. 고객 서비스가 최고입니다.
de desembre 02, 2025
Ils ont toujours été transparents concernant le calendrier de livraison, ce qui est essentiel pour nous.
de desembre 02, 2025
Their transparent pricing policy makes shopping with them a pleasure.
de desembre 02, 2025
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de desembre 02, 2025
They handle every customer interaction with professionalism and genuine kindness.
de desembre 02, 2025
The support team’s responsiveness and helpfulness exceeded my expectations.
de desembre 02, 2025
The professionalism and efficiency of their after-sales support are unmatched in my experience.
de desembre 02, 2025
I was pleasantly surprised by how quickly my order shipped; it arrived much sooner than expected.
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Frequently Asked Questions (FAQ)
Can the LM1771SSD/NOPB be used to replace an LM27313 in a 5V-to-3.3V, 1A buck converter design without major layout changes?
The LM1771SSD/NOPB is not a direct drop-in replacement for the LM27313 due to key architectural differences: the LM1771SSD/NOPB is a current-mode controller requiring an external MOSFET, while the LM27313 integrates the switch. Although both support 5V input and can deliver ~1A output, the LM1771SSD/NOPB offers higher efficiency at light loads due to its synchronous rectification and wider switching frequency range (100kHz–1MHz vs. fixed 1.6MHz). However, replacing the LM27313 with the LM1771SSD/NOPB will require adding an external high-side N-channel MOSFET, redesigning the gate drive circuitry, and potentially adjusting the compensation network. Layout must prioritize short high-di/dt loops between the controller, MOSFET, inductor, and input capacitor. If board space is constrained or BOM simplicity is critical, consider the integrated LM3671 instead.
What are the critical layout considerations when designing with the LM1771SSD/NOPB in a high-density PCB to avoid instability or EMI issues?
When laying out the LM1771SSD/NOPB, minimize the loop area of the high-current paths—especially between the input capacitor, external MOSFET, inductor, and output capacitor—to reduce parasitic inductance and EMI. Place the input ceramic capacitor (<2mm) directly adjacent to the VIN and GND pins of the controller and MOSFET. Use a solid ground plane under the 6-WSON exposed pad and connect it with multiple vias to improve thermal performance and reduce ground bounce. Keep the feedback trace away from noisy switching nodes and route it differentially if possible. Since the LM1771SSD/NOPB lacks internal slope compensation, ensure the compensation network (typically RC from COMP to GND) is placed close to the IC to avoid noise coupling. Failure to follow these practices may result in subharmonic oscillation, excessive output ripple, or failed EMI compliance.
How does the LM1771SSD/NOPB perform under cold-start conditions at -40°C, and what design mitigations are needed for automotive or industrial applications?
The LM1771SSD/NOPB is rated for operation from -40°C to 125°C junction temperature, but cold-start performance depends heavily on external components. At -40°C, the threshold voltage of the external MOSFET increases, potentially reducing gate drive margin and slowing turn-on, which can increase switching losses and risk shoot-through in synchronous operation. Use a logic-level MOSFET with low Qg and ensure the LM1771SSD/NOPB’s 2.8V minimum VCC is maintained during startup—consider a pre-charge circuit or soft-start capacitor if input voltage ramps slowly. Additionally, ceramic capacitors may exhibit significant capacitance loss at low temperatures; select C0G/NP0 types for critical timing or feedback networks. For automotive designs, validate startup behavior across the full temperature range with worst-case component tolerances to avoid latch-up or failure to regulate.
Is the LM1771SSD/NOPB suitable for battery-powered IoT devices requiring ultra-low quiescent current, and how does it compare to the TPS62743?
The LM1771SSD/NOPB is not optimized for ultra-low quiescent current applications typical of battery-powered IoT devices. While it supports pulse-skipping at light loads, its typical operating quiescent current is significantly higher than dedicated low-IQ converters like the TPS62743 (which draws <360nA). The LM1771SSD/NOPB requires an external MOSFET and more complex biasing, increasing total system IQ. For coin-cell or energy-harvesting applications where runtime is measured in years, the TPS62743 or similar devices are far superior. However, if your design already uses a controller-based architecture and needs higher peak efficiency above 100mA load, the LM1771SSD/NOPB’s synchronous topology and wide frequency range offer better performance. Always measure total system current—not just IC IQ—when evaluating battery life.
What failure modes should I anticipate when using the LM1771SSD/NOPB in a 12V-to-5V industrial power supply, and how can I protect against them?
In a 12V-to-5V industrial application, the LM1771SSD/NOPB is vulnerable to input voltage transients, MOSFET avalanche stress, and thermal runaway if not properly designed. Industrial environments often expose circuits to load dumps or inductive spikes exceeding 20V; since the LM1771SSD/NOPB’s absolute max VCC is 6V, use a TVS diode or Zener clamp on the input to protect both the IC and gate driver. Select an external MOSFET with sufficient VDS rating (≥30V) and ensure it operates within its SOA during startup or short-circuit conditions. The controller lacks built-in overcurrent protection, so implement cycle-by-cycle current limiting via the ILIM pin with a sense resistor. Additionally, monitor junction temperature—especially in enclosed systems—since the 6-WSON package relies on PCB copper for heat dissipation. Include a thermal shutdown margin in your design and consider airflow or heatsinking if ambient temperatures exceed 85°C.
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LM1771SSD/NOPB CAD Models
Texas Instruments LM1771SSD/NOPB PCB symbols & footprints
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