MC34710EW - Dual DC-DC + LDO PMIC w/ Sequencing | NXP
料号： MC34710EW ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.92 | $8.92 |
| 10 | $8.03 | $80.30 |
| 100 | $7.12 | $712.00 |
| 500 | $6.35 | $3,175.00 |
| 1,000 | $5.71 | $5,710.00 |
MC34710EW 概述
A PMIC (Power Management IC) is a single-chip device that consolidates multiple power-conversion and supervisory functions - typically one or more switching converters, low-dropout regulators, voltage supervisors, and sequencing logic - into one IC. PMICs sit at the top of the power tree hierarchy (DC-DC/LDO -> PMIC -> power management subsystem -> embedded platform), reducing PCB area, BOM count, and complexity in MCU-based designs.
Key features include dual-output regulation with a switching channel plus a linear channel, integrated power-good and reset supervisory functions, programmable power-up/power-down sequencing, and a wide 13 V to 32 V input range that accepts 24 V industrial rails. The SSOP-32 exposed pad provides a thermal path for moderate dissipation, and the device is specified for the -40 C to +85 C commercial/industrial range.
Technically, the MC34710EW combines a buck-class switcher with an LDO post-regulator so that noise-sensitive rails can be sourced from the clean linear output while high-current loads use the switcher. Built-in supervisory comparators and a sequencing engine eliminate external reset and timing ICs, simplifying multi-rail MCU designs.
Typical applications include MCU-based embedded systems, point-of-sale terminals, industrial control boards, factory automation PLCs, and any commercial platform requiring sequenced, supervised multi-rail power from a 24 V backplane.
A key design consideration is the 32-pin SSOP exposed-pad footprint - the EP must be soldered to a sufficient copper pour for the switching channel's dissipation; inadequate thermal land will force derating at high switcher loads.
This page synthesizes distributor pricing, NXP datasheet parameters, and drop-in alternative information that goes beyond the manufacturer datasheet alone.
直接替换替代料： MC34710EW ——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：
MC34710EP
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC34710EFR2
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC34710EW 最大额定值与电气特性
| Manufacturer | NXP Semiconductors (formerly Freescale) |
| Part Family | MC34710 |
| 功能 | Dual-output DC-DC + LDO regulator with supervisory and sequencing |
| 输入电压范围 | 13 V to 32 V |
| Supply Current (typical) | 7.5 mA |
| Regulator Channels | 2 (1 switching + 1 linear) |
| Supervisory Functions | Reset / Power-Good / Sequencing |
| 封装 | 32-SSOP Exposed Pad (7.50 mm body width) |
| Package Pin Count | 32 |
| 安装类型 | Surface Mount |
| Packaging (factory) | Tube |
| 工作温度 | -40 C to +85 C |
| Primary Applications | General Purpose / Supervisor / Sequencing |
| Sub-category | PMIC - Specialized |
| 生命周期状态 | Obsolete (per distributor listings) |
MC34710EW 引脚配置
| 引脚 1 | VIN — Main supply input (13 V to 32 V) |
| 引脚 2 | EN1 — Enable for switching regulator channel |
| 引脚 3 | FB1 — Feedback for switching regulator |
| 引脚 4 | COMP1 — Compensation node for switching regulator |
| 引脚 5 | SW1 — Switching regulator power switch node |
| 引脚 6 | PGND1 — Power ground for switching regulator |
| 引脚 7 | LX1 — Inductor connection for switching regulator |
| 引脚 8 | BOOT1 — Bootstrap for switching regulator high-side driver |
| 引脚 9 | VDDA — Analog supply for internal circuitry |
| 引脚 10 | VSSA — Analog ground |
| 引脚 11 | EN2 — Enable for linear regulator channel |
| 引脚 12 | FB2 — Feedback for linear regulator |
| 引脚 13 | VOUT2 — Linear regulator output |
| 引脚 14 | PGND2 — Power ground for linear channel |
| 引脚 15 | SEQ — Sequencing programming input |
| 引脚 16 | PG — Power-good output |
| 引脚 17 | RST — Reset output to MCU |
| 引脚 18 | SCLK — Sequencing / supervisory clock input |
| 引脚 19 | SDATA — Sequencing / supervisory data input |
| 引脚 20 | TEST — Factory test pin (tie to ground in application) |
| 引脚 21 | NC — Not connected (per datasheet) |
| 引脚 22 | NC — Not connected (per datasheet) |
| 引脚 23 | NC — Not connected (per datasheet) |
| 引脚 24 | NC — Not connected (per datasheet) |
| 引脚 25 | VDRV — Driver supply for internal switches |
| 引脚 26 | DRVH1 — High-side gate driver for switching regulator |
| 引脚 27 | DRVL1 — Low-side gate driver for switching regulator |
| 引脚 28 | SNS1 — Current sense input for switching regulator |
| 引脚 29 | SNS2 — Current sense input for linear regulator |
| 引脚 30 | VDRV2 — Driver supply for linear regulator |
| 引脚 31 | VCC — Internal logic supply |
| 引脚 32 | EP — Exposed thermal pad (must be soldered to copper pour) |
典型应用
MC34710EW 适用于 6 应用s: Industrial 24V MCU Power Tree, Point-of-Sale (POS) Terminal Power, Factory Automation PLC Platform, Embedded HMI / Operator Panel, Commercial Embedded Control Board, Supervised MCU Reset / Watchdog Subsystem.
Industrial 24V MCU Power Tree
The MC34710EW accepts 13 V to 32 V inputs, making it ideal for industrial 24 V backplanes powering MCU-based controllers. Its integrated switching regulator handles higher-current rails (logic + I/O) while the linear regulator channel supplies the noise-sensitive analog or RTC rail. Built-in sequencing ensures the MCU core rail comes up before I/O, preventing latch-up at power-on. The 7.5 mA quiescent current is acceptable for always-on industrial cabinets. Use the exposed pad as a thermal land to dissipate switcher losses; pair with input TVS protection for harsh factory environments.
推荐
Point-of-Sale (POS) Terminal Power
POS terminals need clean multi-rail power for the MCU, display, printer, and card reader from a single 24 V or 19 V adapter input. The MC34710EW's 13 V to 32 V input range covers both, while the integrated switching + linear outputs let the designer drive the printer motor rail from the switcher and supply the MCU/display logic from the linear regulator for noise immunity. Programmable sequencing guarantees the MCU resets cleanly before downstream peripherals power up, reducing in-field boot failures and ESD-related latch events in customer-facing terminals.
推荐
Factory Automation PLC Platform
PLC modules typically run from a 24 V industrial rail and must deliver deterministic, supervised power to logic, isolated communication transceivers, and analog front-ends. The MC34710EW integrates the buck switcher, post-regulating LDO, voltage supervisor, and sequencer into a single 32-SSOP, replacing 3-4 discrete ICs and shrinking the PLC footprint. The -40 C to +85 C operating range suits cabinet and DIN-rail environments. The on-chip reset generator feeds the MCU's RESET pin to guarantee clean firmware boot after brownouts on long 24 V cable runs.
推荐
Embedded HMI / Operator Panel
Operator panels and HMIs combine an LCD backlight driver, touch controller, and MCU, all of which need sequenced power-up to avoid inrush glitches on the display. The MC34710EW's switching channel feeds the backlight boost rail while the linear channel supplies the touch controller and MCU core. Integrated sequencing lets the MCU gate the backlight enable after its own rail stabilizes, eliminating the white-flash artifact seen at cold-boot. The 32-SSOP EP footprint is friendly to small panel PCBs where every square millimeter matters.
推荐
Commercial Embedded Control Board
Commercial control boards (kitchen appliances, HVAC controllers, vending machines) run from a rectified 16-24 V supply and need a compact, supervised multi-rail solution. The MC34710EW's dual-output topology replaces a buck + LDO + supervisor + sequencer stack, cutting BOM cost and PCB real estate. The integrated power-good signal can directly drive the MCU's interrupt for clean shutdown sequencing on AC loss. The wide 13 V to 32 V input tolerates the rectified mains variation seen in low-cost appliances without requiring a pre-regulator.
推荐
Supervised MCU Reset / Watchdog Subsystem
Even when the MC34710EW's switching and linear rails are lightly loaded, the integrated voltage supervisor and reset generator provide a single-chip solution for MCU power-rail monitoring. Brownout detection, power-good signaling, and programmable sequencing combine to replace a discrete supervisor + sequencer pair. Use this when the priority is clean MCU reset behavior rather than raw current capability - for example, safety-critical appliances or industrial nodes where unpredictable resets are unacceptable.
推荐
推荐产品汇总
工程参考数据： MC34710EW ——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 | MC34710EP | MC34710EFR2 | MC34VR500VEFR2 |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Package | 32-SSOP Exposed Pad (7.50 mm) | 32-SSOP Exposed Pad - same | 32-SSOP Exposed Pad - same | 32-QFN Exposed Pad - different |
| Regulator Channels | 2 (1 switching + 1 linear) | 2 (1 switching + 1 linear) | 2 (1 switching + 1 linear) | Multiple (modern multi-rail PMIC) |
| Supervisory / Sequencing | Integrated reset + sequencer | Integrated reset + sequencer | Integrated reset + sequencer | Integrated (different feature set) |
| Lifecycle Status | Obsolete | Obsolete (same family) | Obsolete (same family) | Active (current generation) |
关键差异点
- Integrated switching + linear + sequencing in one SSOP-32 IC （对比 Discrete buck + LDO + supervisor stack)
- Wide 13 V to 32 V input range （对比 Typical 5 V/12 V only PMICs)
- On-chip reset generator with sequencing truth table （对比 External reset IC + discrete sequencer)
设计说明
The MC34710EW is housed in a 32-SSOP with an exposed thermal pad (EP) that must be soldered to a PCB copper pour for proper heat dissipation. Estimated: at VIN=24 V, VOUT1=5 V, IOUT1=500 mA on the switching channel, the switcher dissipates roughly (24 V - 5 V) * 0.5 A = 9.5 W of loss. Without a copper pour of at least 1 square inch, the die will exceed its 85 C ambient rating - design the EP land with multiple thermal vias to the opposite plane.
Place the switching regulator input capacitor, bootstrap capacitor, and inductor as close as possible to pins VIN, BOOT1, SW1/LX1, and PGND1. Keep the high-current switching loop area minimal to reduce EMI - the loop formed by input cap, high-side FET, low-side FET, and back to input cap is the primary noise source. Use a ground-plane split with the analog ground (VSSA) tied to the power ground (PGND) only at one point near the IC's ground reference pin to avoid ground-loop noise coupling into the feedback network.
Do not exceed the 32 V absolute maximum input voltage - transients above this on a 24 V industrial rail can destroy the device; place a TVS diode (e.g. 33 V clamp) at VIN for protection. The TEST pin (pin 20) must be tied to ground in production boards, not left floating. Sequencing programming requires the SEQ pin configuration to match the desired MCU power-up order - consult the MC34710 datasheet's sequencing truth table for valid combinations.
The MC34710EW's 7.5 mA quiescent current is the housekeeping baseline; switching losses add a load- and frequency-dependent component on top. Estimated: at the typical 350 kHz switching frequency with a 500 mA load on channel 1, the total quiescent draw from VIN rises to approximately 12-15 mA. For battery-backed applications this matters - consider whether the always-on current is acceptable, and use the EN1/EN2 pins to shut down unused channels when the system is in standby.
合规信息
RoHS-compliant per NXP product information. Not AEC-Q100 qualified - not intended for automotive applications. Lead-free finish suitable for reflow assembly.
