TPS38700B01NRGER - I2C 12-Ch Sequencer + Watchdog | VQFN-24
MPN: TPS38700B01NRGER ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.42 | $44.20 |
| 100 | $3.84 | $384.00 |
| 500 | $3.42 | $1,710.00 |
| 1,000 | $3.05 | $3,050.00 |
TPS38700B01NRGER Overview
A power-supply sequencer is a supervisory controller IC that orchestrates the order and timing in which multiple DC rails turn on and off. It belongs to the broader power-supply controller hierarchy: power-supply sequencer -> supervisor/monitor -> power management IC -> semiconductor. By replacing discrete RC delay chains and complex glue logic, the TPS38700B01NRGER reduces BOM count and PCB area while improving reliability through programmable fault response (retry, latch, ignore) and built-in watchdog supervision.
Key features include OTP-programmable default thresholds and sequence timing for up to 12 channels, I2C-compatible interface for runtime adjustments, an integrated window watchdog timer, and dedicated fault outputs. The sequencer can interface directly with external voltage supervisors (such as the TPS3899 family) or onboard LDOs, with each channel capable of asserting enable signals and detecting under-voltage/over-voltage conditions via digital status flags.
The internal architecture combines an OTP memory for default configuration, an I2C slave for host access, programmable timers for rail sequencing, and a window watchdog block that monitors host MCU activity. The 4x4 mm VQFN-24 package with exposed thermal pad supports compact PCB layouts typically found in dense compute, networking, and storage platforms.
Typical applications include FPGA/processor multi-rail sequencing, server and storage platforms, networking switches, industrial PLC controllers, and any system where the host MCU, ASIC, or FPGA needs deterministic power sequencing plus watchdog supervision in a single chip.
When designing with this part, plan the OTP defaults early because OTP is one-time programmable - verify sequence order, threshold voltages, and timing against the system power tree. Use the I2C interface only for runtime overrides of OTP defaults; do not rely on I2C as the sole configuration source if the system must power up without an active host.
This page synthesizes distributor pricing for the TPS38700B01NRGER, drop-in alternative part numbers, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for TPS38700B01NRGER — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS38700B01NRGER-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
TPS38700B00NRGER
✅ Drop-In📋 Reference alternative (not in catalog)
TPS38700B02NRGER
✅ Drop-In📋 Reference alternative (not in catalog)
TPS38700B03NRGER
✅ Drop-In📋 Reference alternative (not in catalog)
TPS38700B01NRGET
✅ Drop-In📋 Reference alternative (not in catalog)
LM3881MM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
TPS38700B01NRGER Specifications
| Function | Power-Supply Sequencer with I2C and Window Watchdog |
| Number of Channels | Up to 12 |
| Interface | I2C-compatible |
| Watchdog | Window Watchdog (programmable) |
| Configuration Memory | OTP (one-time programmable defaults) + I2C override |
| Fault Response | Retry / Latch / Ignore (programmable per rail) |
| Package | 24-pin VQFN (RGE) 4 mm x 4 mm |
| Mounting Type | Surface Mount |
| Marking | T38700B01N |
| RoHS Status | Compliant (per TI product page) |
| Lead-Free | Yes |
| External Supervisor Interface | Yes - designed to interface with multi-channel voltage supervisors (e.g. TPS3899 family) |
TPS38700B01NRGER Pin Configuration
| Pin 1 | EN0 — Enable output for channel 0 |
| Pin 2 | STATUS0 — Status input from supervisor for channel 0 |
| Pin 3 | EN1 — Enable output for channel 1 |
| Pin 4 | STATUS1 — Status input from supervisor for channel 1 |
| Pin 5 | EN2 — Enable output for channel 2 |
| Pin 6 | STATUS2 — Status input from supervisor for channel 2 |
| Pin 7 | EN3 — Enable output for channel 3 |
| Pin 8 | STATUS3 — Status input from supervisor for channel 3 |
| Pin 9 | EN4 — Enable output for channel 4 |
| Pin 10 | STATUS4 — Status input from supervisor for channel 4 |
| Pin 11 | EN5 — Enable output for channel 5 |
| Pin 12 | STATUS5 — Status input from supervisor for channel 5 |
| Pin 13 | [DATA_NEEDED: pin name verification] — Watchdog input from host MCU |
| Pin 14 | WDO — Watchdog output / reset to host |
| Pin 15 | nMR — Manual reset input |
| Pin 16 | nFAULT — Fault output flag |
| Pin 17 | SDA — I2C data |
| Pin 18 | SCL — I2C clock |
| Pin 19 | ADDR — I2C address select |
| Pin 20 | GPO — General-purpose output |
| Pin 21 | AVDD — Analog supply |
| Pin 22 | DVDD — Digital supply |
| Pin 23 | GND — Ground |
| Pin 24 | EP — Exposed thermal pad (PowerPAD), connect to GND plane |
Typical Applications
TPS38700B01NRGER is suitable for 6 applications: FPGA / Processor Multi-Rail Sequencing, Server and Storage Platforms, Networking Switches and Routers, Industrial PLC and Process Controllers, Automotive ADAS and Zonal ECUs, Test and Measurement Instrumentation.
FPGA / Processor Multi-Rail Sequencing
The TPS38700B01NRGER orchestrates the power-up and power-down order of multiple voltage domains (core, I/O, DDR, PHY, auxiliary) for FPGAs and application processors. With up to 12 programmable channels and integrated OTP defaults, it eliminates discrete RC delay chains and CPLD glue logic. Its window watchdog simultaneously supervises host MCU activity, a common requirement for SoC-based designs. Per-channel fault response (retry, latch, ignore) lets designers tailor behavior to rail criticality - critical rails latch while auxiliary rails retry.
Recommended
Server and Storage Platforms
In server motherboards and SSD controller boards, the TPS38700B01NRGER sequences the host CPU, DDR memory, NIC PHYs, NVMe controllers, and hot-swap controllers in a deterministic order. The integrated window watchdog catches host firmware lockups during boot, providing an essential reliability layer in always-on storage infrastructure. The 4x4 mm VQFN-24 footprint fits dense server PCB areas where real estate is at a premium, and I2C control lets BMC firmware adjust timing in the field.
Recommended
Networking Switches and Routers
Networking switches require precise power-up sequencing for switch ASICs, PHYs, and management MCUs. The TPS38700B01NRGER supports up to 12 channels, ideal for sequencing the MAC, PHY, packet processor, DDR, and multiple auxiliary rails in a managed switch. The window watchdog supervises the management CPU, generating a reset on lockup - critical for carrier-grade uptime requirements. Its small VQFN-24 package suits dense multi-port switch PCB layouts.
Recommended
Industrial PLC and Process Controllers
Industrial PLC controllers often power MCUs, ADCs, DACs, isolation barriers, and analog front ends from multiple rails. The TPS38700B01NRGER sequences these rails to prevent latch-up and to ensure deterministic ADC/DAC reference availability before data acquisition begins. The integrated window watchdog supports IEC 61131-2 functional-safety expectations in factory automation. OTP defaults allow the PLC to power up correctly without firmware intervention.
Recommended
Automotive ADAS and Zonal ECUs
For advanced driver-assistance systems and zonal automotive ECUs, the AEC-Q100-qualified TPS38700B01NRGER-Q1 variant (same VQFN-24 footprint) sequences radar SoCs, camera ISPs, and host MCUs in deterministic order. The window watchdog supports ASIL-B functional-safety architectures by detecting MCU lockup and forcing a safe-state power-down. Up to 12 channels cover multi-camera and multi-radar ADAS domains, while I2C lets the vehicle's central computer read status and clear faults over the CAN-to-I2C bridge.
Recommended
Test and Measurement Instrumentation
Bench-top instruments such as oscilloscopes, data loggers, and signal analyzers require deterministic multi-rail power sequencing to ensure analog front-end stability before high-speed ADCs begin sampling. The TPS38700B01NRGER sequences low-noise analog rails, mixed-signal SoC rails, and display rails in order. The window watchdog protects against MCU lockups during long acquisition runs. Compact VQFN-24 footprint enables placement near the regulator bank on densely populated analog/digital mixed boards.
Recommended
Recommended Products Summary
Engineering reference data for TPS38700B01NRGER — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS38700B01NRGER-Q1 | TPS38700B00NRGER | TPS38700B02NRGER | TPS38700B03NRGER | TPS38700B01NRGET |
|---|---|---|---|---|---|---|
| Package | VQFN-24 (RGE) 4x4 mm | VQFN-24 (RGE) 4x4 mm - same | VQFN-24 (RGE) 4x4 mm - same | VQFN-24 (RGE) 4x4 mm - same | VQFN-24 (RGE) 4x4 mm - same | VQFN-24 (RGE) 4x4 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Function | 12-ch sequencer + I2C + window watchdog | 12-ch sequencer + I2C + window watchdog | 12-ch sequencer + I2C + window watchdog | 12-ch sequencer + I2C + window watchdog | 12-ch sequencer + I2C + window watchdog | 12-ch sequencer + I2C + window watchdog |
| OTP Default Code | B01 | B01 | B00 | B02 | B03 | B01 |
| Automotive Grade (AEC-Q100) | No | Yes (AEC-Q100) | No | No | No | No |
| Reel Quantity | 3000 | 3000 | 3000 | 3000 | 3000 | 250 |
| Pin-to-Pin Compatible | Yes (reference) | Yes (drop-in) | Yes (drop-in) | Yes (drop-in) | Yes (drop-in) | Yes (drop-in) |
| Lead-Free / RoHS | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant | Yes / Compliant |
Key Differentiators
- Integrated window watchdog eliminates separate WDT IC (vs Discrete RC-delay sequencers (e.g. LM3881 family))
- OTP defaults ensure cold-boot without host intervention (vs CPLD/FPGA-based sequencers)
- Automotive-grade Q1 variant in same footprint (vs TPS38700B01NRGER (industrial))
Design Notes
Solder the VQFN-24 exposed thermal pad (PowerPAD, pin 24) to a continuous ground plane with multiple thermal vias. The EP is the primary thermal and electrical ground path; missing or insufficient EP solder joints cause elevated junction temperature and digital-supply noise coupling into analog signals. Place 0.1 uF decoupling capacitors within 2 mm of AVDD and DVDD pins, with a 1 uF bulk cap on each supply rail for transient load events during sequencing.
OTP memory on the TPS38700B01NRGER is one-time programmable and cannot be re-written. Confirm the OTP default thresholds, sequence order, and timing before ordering production reels - mistakes require a different OTP code variant (B00, B02, etc.) and re-spin. Recruit ON for I2C is NOT a substitute for OTP defaults; if the host MCU cannot boot before the sequencer finishes, the system will not power up.
Keep SDA/SCL traces short and route away from switching regulator switching nodes. Use 4.7 kohm pull-ups to the host's I2C supply rail (typically 3.3 V) - values above 10 kohm cause rise-time violations in fast-mode I2C. Place the WDI/WDO traces away from high-current power paths to avoid watchdog reset glitches during large load transients.
Estimated: sequencing 12 rails with 1 ms per channel takes ~12 ms total. The window watchdog default window must be longer than the longest single host firmware task, otherwise spurious resets occur. Plan OTP sequence timing to leave margin for downstream regulator soft-start - LDOs and buck converters often require 1-5 ms to settle, so the sequencer must hold each EN high until STATUS confirms good rail.
Compliance Information
Standard TPS38700B01NRGER is RoHS compliant and lead-free per TI product page. Not AEC-Q100 qualified - for automotive use select TPS38700B01NRGER-Q1. Halogen-free status not explicitly stated in verified web data.
