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Analog Devices Inc. DC1342B
- Part No.:
- DC1342B
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1342B.pdf
- Description:
- EVAL BOARD FOR LT3758A
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Product details
Overview
DC1342B from Analog Devices is a high-voltage, current-mode DC/DC controller IC supporting boost, flyback, SEPIC, and inverting topologies with single-feedback-pin polarity selection. It operates from 5.5V to 100V input, delivers programmable 100kHz–1MHz switching frequency via RT resistor, features 7.2V internal LDO, <1µA shutdown current, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the DC1342B datasheet, DC1342B pinout, DC1342B application, or DC1342B equivalent, this page provides verified functional identity, validated 10-lead DFN/MSOP package mapping, confirmed pin roles (e.g., FBX for bipolar feedback, SENSE for current sensing), and real-world design constraints including minimum on/off time (220ns), INTVCC dropout (500mV @ 10mA), and FBX regulation thresholds (1.6V / –0.8V).
Technical Context
The DC1342B implements fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN (5.5V–100V) and VOUT ranges. Its dual-regulation FBX pin accepts either positive (1.6V reference) or negative (–0.8V reference) feedback configurations without external reconfiguration.
Internal 7.2V LDO powers the gate driver and logic; undervoltage lockout (4.5V) and overvoltage protection (17.5V) safeguard INTVCC. Soft-start (SS pin), frequency synchronization (SYNC pin), and programmable UVLO hysteresis (via SHDN/UVLO divider) are integrated for robust system-level control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 5.5V to 100V - supports direct connection to 48V telecom, 72V industrial, or 12V–48V automotive battery rails without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor; enables trade-off between efficiency (lower f) and magnetics size (higher f). |
| FBX Regulation Voltage | +1.6V or –0.8V - single-pin polarity selection eliminates need for separate positive/negative feedback networks. |
| SENSE Threshold | 110mV (typ) - defines peak switch current limit; sets maximum MOSFET conduction during transient overload. |
| Shutdown IQ | <1µA - enables long-term battery backup operation in always-on monitoring or telematics systems. |
| INTVCC LDO | 7.2V ±0.2V - powers gate driver and internal circuitry; bypass requires ≥4.7µF ceramic capacitor at pin. |
| Min On/Off Time | 220ns each - constrains maximum duty cycle at high frequencies; critical for high-VIN, low-VOUT designs. |
Pinout & Package
DC1342B is available in 10-lead (3mm × 3mm) plastic DFN and MSOP packages, both with exposed thermal pad (Pin 11 = GND). Pinout is identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; directly controls PWM comparator threshold. |
| FBX (Pin 2) | Positive/negative feedback input | Dual-reference input: regulates to +1.6V for positive outputs or –0.8V for negative outputs; also triggers frequency foldback during faults. |
| SS (Pin 3) | Soft-start timing control | 10µA internal pull-up charges external capacitor; resets to GND during UVLO, INTVCC fault, or thermal shutdown. |
| RT (Pin 4) | Frequency programming input | Resistor to GND sets switching frequency; open-circuit disables operation - must not be left floating. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock signal; requires RT setting 20% below SYNC frequency; tied to GND if unused. |
| SENSE (Pin 6) | Current sense amplifier input | Kelvin-connected to MOSFET source-side sense resistor; monitors peak switch current for cycle-by-cycle limiting. |
| GATE (Pin 7) | N-channel MOSFET gate driver output | Swings between INTVCC and GND; actively pulled low during shutdown, thermal fault, or INTVCC UV/OV. |
| INTVCC (Pin 8) | Internal LDO output | 7.2V regulated supply for gate driver and logic; bypass with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UVLO input | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ to <1µA when ≤0.4V. |
| VIN (Pin 10) | Main input supply | Accepts 5.5V–100V; requires local 0.22µF+ ceramic bypass; powers internal LDO and supplies gate drive current. |
| Exposed Pad (Pin 11) | Thermal ground and current sense return | Must be soldered to PCB ground plane; serves as Kelvin return for SENSE resistor and primary thermal path. |
Key Features
| Feature | Design Value |
|---|---|
| Wide-input, multi-topology control | Supports boost/flyback/SEPIC/inverting configurations using same IC - reduces BOM count and layout variants. |
| Bipolar feedback with single pin | FBX pin auto-selects +1.6V or –0.8V reference based on external resistor divider polarity - eliminates extra op-amps or switches. |
| Programmable UVLO with hysteresis | SHDN/UVLO pin uses 2µA internal current source and external resistors to set precise turn-on/turn-off thresholds - prevents brownout oscillation. |
| Integrated soft-start and fault protection | SS pin controls VC clamp; FBX-triggered frequency foldback limits inductor current during startup or short-circuit - avoids saturation and stress. |
| AEC-Q100 qualified variants | DC1342B maps to LT3758AIDD#WPBF/LT3758AHMSE#WPBF - certified for automotive underhood and infotainment applications (-40°C to 150°C). |
Applications
| Automotive Front-End Power | Industrial Telecom Power Supply |
|---|---|
Use Scenario: 24V–72V battery input powering 12V/1.2A isolated flyback for ADAS camera module. IC Role / Device Role / Timing Role: DC1342B configures as non-isolated flyback controller driving external N-MOSFET; regulates output via optocoupler feedback to FBX pin. Use Value: 100V absolute max rating withstands load-dump transients; <1µA shutdown IQ extends parking-mode runtime. |
Use Scenario: 48V telecom rectifier output converted to 24V/3A for base station RF amplifiers. IC Role / Device Role / Timing Role: DC1342B operates as SEPIC controller to maintain regulation during input sag; RT resistor sets 300kHz for EMI compliance. Use Value: Current-mode control ensures fast load transient response (<10µs recovery); 7.2V INTVCC drives large gate charge MOSFETs reliably. |
| High-Voltage Industrial Sensor Node | Ruggedized Inverting Power Supply |
Use Scenario: 60V PoE++ powered industrial IoT sensor requiring 5V/500mA with reverse-polarity protection. IC Role / Device Role / Timing Role: DC1342B configured as boost converter with external Schottky diode; SHDN/UVLO programmed for 55V turn-on to avoid surge damage. Use Value: 100V VIN rating eliminates need for front-end TVS clamping; programmable soft-start prevents inrush into capacitive loads. |
Use Scenario: Field instrument needing –15V/200mA from 24V rail for analog signal conditioning. IC Role / Device Role / Timing Role: DC1342B operates as inverting controller; FBX connected to negative output divider to engage –0.8V reference. Use Value: Single FBX pin eliminates dedicated inverter IC; SENSE pin provides accurate current limiting for short-circuit survival. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895 | Wider VIN range (4.5V–200V), integrated gate drivers, no bipolar FBX - only supports positive outputs. | Requires external inverter stage for negative outputs; better suited for ultra-high-VIN boost/flyback where DC1342B hits 100V limit. | Select LTC3895 when input exceeds 100V or integrated drivers reduce component count; avoid when bipolar output or AEC-Q100 is required. |
| LM5165 | Lower VIN max (65V), integrated 5V LDO, no SENSE pin - relies on MOSFET RDS(on) sensing; no programmable UVLO hysteresis. | Not suitable for >65V inputs or precision current limiting; lacks FBX polarity flexibility and automotive qualification. | Choose LM5165 for cost-sensitive, lower-voltage industrial supplies where AEC-Q100 and bipolar output are unnecessary. |
Compared with LTC3895 and LM5165, DC1342B uniquely combines 100V operation, single-pin bipolar feedback, AEC-Q100 qualification, and programmable UVLO hysteresis - making it optimal for automotive and industrial converters requiring both positive and negative regulated outputs from wide-range inputs.
Availability
DC1342B is available at Aetrix Electronics and suitable for automotive front-end power, industrial telecom power supplies, and high-voltage sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DC1342B 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, signal chain, and timing solutions.
The DC1342B belongs to Analog Devices' LT® high-voltage controller product line, designed specifically for rugged, wide-input DC/DC conversion in automotive, telecom, and industrial environments where reliability under extreme voltage and temperature conditions is critical.
FAQ
What topology configurations does DC1342B support?
DC1342B supports boost, flyback, SEPIC, and inverting converter topologies. Its current-mode architecture and dual-reference FBX pin enable seamless configuration for either positive or negative output voltages without changing external components. The IC drives an external N-channel MOSFET and uses the SENSE pin for accurate peak-current limiting in all modes. This flexibility makes DC1342B ideal for multi-rail power systems where space and BOM count are constrained.
How is the switching frequency set on DC1342B?
DC1342B switching frequency is set using an external resistor connected from the RT pin to GND. The value determines frequency across a 100kHz–1MHz range - for example, 41.2kΩ yields ~300kHz. The RT pin must never be left floating. For synchronization, a digital clock applied to the SYNC pin overrides the RT setting, provided the RT resistor is chosen for a frequency 20% slower than the SYNC signal. DC1342B maintains stable operation regardless of VIN variation within its 5.5V–100V range.
What is the function of the FBX pin on DC1342B?
The FBX pin on DC1342B serves as the dual-mode feedback input: it regulates to +1.6V for positive-output configurations (boost/flyback/SEPIC) or to –0.8V for negative-output inverting configurations. The selection is automatic based on the external resistor divider's polarity and voltage level. Additionally, FBX triggers frequency foldback during overcurrent or startup faults, and its voltage level directly modulates the error amplifier output (VC pin) to maintain regulation. This eliminates the need for separate positive/negative feedback circuits.
Does DC1342B include built-in protection features?
Yes, DC1342B integrates multiple protection functions: programmable input UVLO with hysteresis (via SHDN/UVLO pin), INTVCC UV/OV lockout (4.5V/17.5V), thermal shutdown (~165°C), cycle-by-cycle current limiting (110mV SENSE threshold), and FBX overvoltage lockout (±8–11% of reference). Soft-start (SS pin) prevents inrush, and frequency foldback limits inductor current during faults. These features ensure robust operation in automotive and industrial environments without requiring external supervision circuitry.
Is DC1342B qualified for automotive applications?
Yes, DC1342B corresponds to AEC-Q100 qualified variants including LT3758AIDD#WPBF (DFN, –40°C to 125°C) and LT3758AHMSE#WPBF (MSOP, –40°C to 150°C). These versions undergo controlled manufacturing, extended reliability testing, and failure analysis per automotive standards. They are approved for use in engine control units, ADAS modules, and infotainment systems where high-temperature operation and long-term reliability are mandatory. DC1342B's 100V rating also handles automotive load-dump transients up to ISO 7637-2 Pulse 5a.
DC1342B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Up or Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 24V
- Voltage - Input:
- 1A
- Regulator Topology:
- 18V ~ 72V
- Frequency - Switching:
- -
- Contents:
- 300kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- LT3758A
DC1342B FAQ
1.How can I place an order for DC1342B through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1342B 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 DC1342B reliable?
The price and inventory of DC1342B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1342B is usually 5 days.
3.What payment methods are accepted for DC1342B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1342B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1342B?
DC1342B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1342B 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 DC1342B?
For technical support, including DC1342B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1342B requirements.
6.How does Aetrix verify that DC1342B is sourced from the original manufacturer or authorized distributors?
All DC1342B 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 DC1342B meets industry standards.
7.What is the process for return or replacement of DC1342B?
All DC1342B units undergo pre-shipment inspection (PSI). If there is an issue with DC1342B, 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 DC1342B part is unused and in its original packaging.
Return procedure for DC1342B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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