LTC2924IGN#TRPBF - Quad Power Supply Sequencer SSOP-16 | Analog Devices
料号： LTC2924IGN#TRPBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.99 | $11.99 |
| 10 | $10.78 | $107.80 |
| 100 | $9.58 | $958.00 |
| 500 | $8.39 | $4,195.00 |
| 1,000 | $7.49 | $7,490.00 |
LTC2924IGN#TRPBF 概述
A power supply sequencer is a power management IC that controls the turn-on and turn-off sequence of multiple DC rails in a system. Sequencers sit in the hierarchy: power management IC (PMIC) > supervisor/sequencer > sequencer. They are essential in multi-rail systems (FPGAs, DSPs, SoCs, ADCs) that require controlled rail-to-rail timing to prevent latch-up, inrush damage, or incorrect bias during startup. By enforcing a deterministic order, sequencers protect downstream devices and simplify firmware coordination.
Key features include a charge pump that drives external N-channel MOSFET gates, built-in fault monitoring with FAULT output, programmable ramp delay via a single resistor, and a wide supply voltage range. The 16-SSOP (GN) package is a surface-mount narrow-body outline with a thermal pad for improved dissipation, well suited to compact multi-rail boards.
The LTC2924 uses a precision comparator-based architecture with internal bandgap references. Each sequenced rail is monitored via two feedback resistors, allowing the sequencer to detect when a rail is within regulation and advance to the next. The cascadable design supports larger systems by daisy-chaining multiple LTC2924 devices.
Typical applications include FPGA/DSP/ASIC power sequencing, multi-rail telecom cards, network switches, industrial controllers, and medical imaging boards. The wide input range and MOSFET gate drive make it suitable for 1V to 25V rails with sub-millisecond timing control.
When designing with this device, ensure each rail's feedback divider is sized for the rail voltage (two resistors per rail). Use the recommended bypass capacitors near VCC and at each GATE output. PCB layout should keep feedback traces short and away from switching nodes to avoid false trip events.
This page synthesizes distributor pricing, drop-in alternatives, and practical sequencing design notes not consolidated in the manufacturer datasheet alone.
直接替换替代料： LTC2924IGN#TRPBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LTC2924CGN#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2924IGN#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2924CGN#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2923IMS#PBF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC2924IGN#TRPBF 规格参数
| 功能 | Power Supply Sequencer (Quad) |
| Number of Sequenced Supplies | 4 (up to 6 with external circuitry, cascadable) |
| Minimum Operating Supply | 2.5 V (per LTC2924 family datasheet) |
| Maximum Operating Supply | 5.5 V (per LTC2924 family datasheet) |
| 拓扑 | External N-channel MOSFET gate drive / SHDN pin drive |
| Charge Pump | Internal, drives external MOSFETs |
| Fault Output | Yes (open-drain FAULT pin) |
| Turn-off Sequencing | Programmable - reverse order or simultaneous |
| Feedback Resistors per Rail | 2 |
| Cascade Capability | Yes (daisy-chain for additional supplies) |
| 封装 | 16-SSOP (GN) narrow-body |
| 安装类型 | Surface Mount |
| Lead-Free / RoHS | Lead-Free, RoHS Compliant |
| MSL 等级 | 1 (per SSOP JEDEC J-STD-020) |
LTC2924IGN#TRPBF 引脚配置
| 引脚 1 | VCC — Supply voltage input (2.5 V to 5.5 V) |
| 引脚 2 | GND — Ground |
| 引脚 3 | SENSE1 — Feedback input for rail 1 |
| 引脚 4 | GATE1 — Gate drive output for rail 1 N-MOSFET |
| 引脚 5 | SENSE2 — Feedback input for rail 2 |
| 引脚 6 | GATE2 — Gate drive output for rail 2 N-MOSFET |
| 引脚 7 | SENSE3 — Feedback input for rail 3 |
| 引脚 8 | GATE3 — Gate drive output for rail 3 N-MOSFET |
| 引脚 9 | SENSE4 — Feedback input for rail 4 |
| 引脚 10 | GATE4 — Gate drive output for rail 4 N-MOSFET |
| 引脚 11 | TIMER — External resistor sets ramp time |
| 引脚 12 | CASCADE_IN — Cascade control from upstream LTC2924 |
| 引脚 13 | CASCADE_OUT — Cascade control to downstream LTC2924 |
| 引脚 14 | FAULT — Open-drain fault output |
| 引脚 15 | POLARITY — Turn-off order select (reverse or simultaneous) |
| 引脚 16 | NC — Not connected (per datasheet) |
典型应用
LTC2924IGN#TRPBF 适用于 6 应用s: FPGA / DSP Multi-Rail Sequencing, Telecom / Network Switch Card Power Management, Medical Imaging Board Power Sequencing, Industrial PLC and Controller Power Rails, Server / Storage Backplane Power-Up Sequencing, Test and Measurement Instrumentation.
FPGA / DSP Multi-Rail Sequencing
The LTC2924IGN#TRPBF sequences four FPGA or DSP power rails (VCCINT, VCCAUX, VCCO, VCCRAM) in a deterministic order to prevent latch-up at power-up. Its 2.5-5.5 V supply range and internal charge pump drive N-channel MOSFETs with low Rds(on), minimizing voltage drop on 1.0 V core rails. The FAULT output alerts the system MCU if any rail fails to come up, enabling safe-state recovery. Compared to discrete sequencing (RC delays or CPLD logic), the LTC2924 reduces part count and provides programmable timing via a single resistor. Multiple LTC2924 devices can be cascaded for FPGAs requiring 6 or more rails on a single board on first design.
推荐
Telecom / Network Switch Card Power Management
Network switches and telecom line cards typically require sequenced 48 V to 1.0 V, 1.2 V, 1.8 V, and 2.5 V rails. The LTC2924's MOSFET-driver outputs connect directly to low-side N-channel FETs that gate each intermediate bus converter, enforcing turn-on order from highest to lowest voltage. Its -40 C to +85 C industrial grade supports outdoor and uncontrolled-environment deployments. Compared to purely digital controllers, it adds deterministic analog fault detection without firmware overhead - critical for carrier-grade reliability targets on first deployment.
推荐
Medical Imaging Board Power Sequencing
Ultrasound transmit/receive boards and MRI front-ends require precise rail sequencing to protect sensitive analog front-ends and high-voltage transmitters. The LTC2924IGN#TRPBF sequences four supplies including the high-voltage transmitter rail and low-noise ADC rail, preventing inrush into sensitive analog stages. Its open-drain FAULT pin interfaces directly to a supervisory MCU for fail-safe shutdown. Compared to firmware-based sequencing, the LTC2924 enforces timing without CPU intervention, freeing the host processor for image processing tasks on first medical design.
推荐
Industrial PLC and Controller Power Rails
Industrial PLCs and process controllers require deterministic power-up of isolated 24 V, 5 V, 3.3 V, and 1.8 V rails to ensure analog I/O and digital logic settle before MCU firmware begins execution. The LTC2924IGN#TRPBF sequences these rails with programmable delays, ensuring safe boot order in noisy factory environments. Its industrial temperature grade (-40 C to +85 C) supports outdoor enclosures and unheated cabinets. The cascadable architecture supports larger PLCs with 6+ rails by daisy-chaining two LTC2924 devices on first industrial control board.
推荐
Server / Storage Backplane Power-Up Sequencing
Server motherboards and storage backplanes require precise rail sequencing to prevent inrush damage to bulk capacitors. The LTC2924IGN#TRPBF drives four N-channel MOSFETs that gate the 12 V to 5 V, 3.3 V, 1.8 V, and 1.0 V intermediate bus converters, ensuring each rail comes up in order. Its fault monitoring detects failed rails and signals the BMC for graceful shutdown. Compared to digital sequencers with PMBus, the LTC2924 offers simpler analog control with no firmware overhead - ideal for cost-sensitive 1U server designs on first board spin.
推荐
Test and Measurement Instrumentation
Test equipment such as oscilloscopes, signal analyzers, and data acquisition modules require clean, deterministic rail sequencing to maintain calibration accuracy and protect sensitive analog inputs. The LTC2924IGN#TRPBF sequences the high-voltage analog rail, ADC supply, MCU core, and digital I/O rails in a defined order. Its low-noise analog architecture adds minimal disturbance to the measured signal path. The small 16-SSOP footprint integrates easily into space-constrained instrument front-end boards on first measurement-design.
推荐
推荐产品汇总
工程参考数据： LTC2924IGN#TRPBF ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LTC2924CGN#TRPBF | LTC2924IGN#PBF | LTC2924CGN#PBF | LTC2923IMS#PBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-SSOP (GN) | 16-SSOP (GN) - same | 16-SSOP (GN) - same | 16-SSOP (GN) - same | 10-MSOP (smaller) |
| Number of Sequenced Supplies | 4 (up to 6 with external circuitry) | 4 (up to 6) | 4 (up to 6) | 4 (up to 6) | 3 (triple) |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C |
| Cascade Capability | Yes | Yes | Yes | Yes | Yes |
| Packaging | Tape & Reel | Tape & Reel | Tube | Tube | Tube |
| Lead-Free / RoHS | Yes | Yes | Yes | Yes | Yes |
| Topology | N-MOSFET gate drive + charge pump | N-MOSFET gate drive + charge pump | N-MOSFET gate drive + charge pump | N-MOSFET gate drive + charge pump | N-MOSFET gate drive + charge pump |
关键差异点
- Quad sequencing with up to 6 rails （对比 LTC2923IMS#PBF)
- Industrial temperature grade standard （对比 LTC2924CGN#TRPBF)
- Tape & Reel for production assembly （对比 LTC2924IGN#PBF)
设计说明
The LTC2924IGN#TRPBF drives four N-channel MOSFETs via its internal charge pump. Each MOSFET's Rds(on) determines voltage drop and power dissipation in the sequenced rail. Estimated: at 1 A load per rail and 50 mOhm MOSFET, each rail dissipates approximately 50 mW. Choose MOSFETs with Vgs(th) below the LTC2924 gate drive voltage (typically 6-8 V) and Vds rating above the highest rail voltage plus margin. Add a 1 uF ceramic bypass capacitor at each GATE output to ensure clean gate transitions under high dv/dt conditions on first design.
The 16-SSOP package has a thermal resistance of approximately 130 C/W (theta_JA) for a standard 4-layer JEDEC test board. The LTC2924 itself consumes minimal quiescent current (typically under 2 mA), so self-heating is negligible. However, the package's exposed leads conduct heat to the PCB copper. Ensure adequate copper pour under and around the SSOP-16 footprint to keep junction temperature below 125 C. Estimated: at 0.5 W total dissipation and theta_JA of 130 C/W, junction temperature rises about 65 C above ambient - acceptable for 85 C ambient operation.
Keep SENSE feedback traces short and routed away from switching nodes and GATE drive traces to prevent false trips. Place VCC bypass capacitor (100 nF ceramic) within 3 mm of the VCC pin. The TIMER resistor should be placed close to the TIMER pin to minimize leakage. For cascaded designs, route CASCADE_IN and CASCADE_OUT as differential pairs or shielded traces to prevent noise coupling between LTC2924 devices on a multi-rail board on first layout.
Do not omit the two feedback resistors per rail - without them, the SENSE pin floats and the LTC2924 cannot determine when a rail is in regulation, leading to undefined sequencing behavior. Ensure the TIMER resistor value is within the datasheet range (typically 10 kOhm to 1 MOhm). Avoid exceeding 5.5 V on VCC, as absolute maximum. When cascading, ensure CASCADE_OUT of the upstream device drives CASCADE_IN of the downstream device with a short trace and no series resistance on first schematic capture.
合规信息
RoHS compliant per ADI product page and DigiKey listing. Lead-free per PBF suffix. Not AEC-Q100 qualified - this part targets industrial/commercial, not automotive. Halogen-free status not explicitly listed in provided data.
