MC34704AEPR2 - Multi-Channel PMIC, 8 DC/DC QFN-56 | NXP
MPN: MC34704AEPR2 ✗ Cuối đờiMC34704AEPR2 Tóm tắt
A power management IC (PMIC) is an integrated circuit that consolidates multiple voltage regulators, supervisory functions, and control logic onto a single die to simplify system power architecture. Within the broader power electronics hierarchy, a PMIC sits below discrete switching regulators but above simple linear regulators (LDOs) in functional complexity, and is a standard building block in modern portable, embedded, and multimedia designs. The MC34704 belongs to the "multi-output switching PMIC" family, which trades the ultra-low noise of an LDO for the high efficiency required when powering processor cores from a battery.
Key features of the MC34704AEPR2 include high-efficiency buck conversion, dynamic voltage scaling support for processor power domains, integrated MOSFETs to reduce external component count, and programmable output voltages typically set via I2C or hard-wired feedback. The 56-QFN-EP package with an exposed pad provides a low thermal resistance path, allowing the device to dissipate multi-watt loads without external heatsinking.
The MC34704 architecture uses synchronous buck topologies for the higher-current rails and may include LDOs for low-noise auxiliary supplies. Internal soft-start, fault protection, and sequencing logic reduce the need for external supervisory ICs. Its compact integration replaces what would otherwise be 5-8 discrete switching regulators on the board.
Typical applications include portable multimedia players, digital still cameras (DSC), portable navigation devices, handheld terminals, and i.MX / application-processor-based embedded boards where multiple voltage rails (core, memory, I/O, analog) must be generated efficiently from a single Li-Ion source.
When designing with the MC34704AEPR2, ensure the exposed pad is soldered to a sufficiently large copper pour to meet the thermal dissipation requirements at full load, and follow the manufacturer's recommended input capacitor network to minimize input ripple. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that supplement the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MC34704AEPR2 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC34704AEPR2 (cùng hình factor và footprint) — khác nhau ở Lead-Free, Package, RoHS Status, Topology.
MC34704EP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC34704AEPR2
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC34704AEPR2 Tỷ lệ tối đa & tính chất điện
| Cấu trúc | Multi-channel synchronous buck PMIC |
| Số lượng đầu ra | Up to 8 (or 5 DC/DC in alternate configuration) |
| Phạm vi điện áp đầu vào | 2.7 V to 5.5 V |
| Output Voltage Channels | 8 independent programmable rails |
| Hộp | QFN-56 (7x7 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Target Application | Multimedia application processors (DSC, portable media, i.MX) |
| Input Supply | Single Li-Ion / 2.7-5.5 V |
| Conversion Type | DC-DC switching (buck) |
| Trạng thái RoHS | Compliant (per DigiKey listing) |
| Lead-Free | Yes (per distributor listing) |
| Số chân | 56 |
Cấu hình chân MC34704AEPR2
| Chân 1 | AGND — Analog ground |
| Chân 2 | VIN — Main input supply (2.7V-5.5V) |
| Chân 3 | EN1 — Enable for channel 1 |
| Chân 4 | FB1 — Feedback for channel 1 output |
| Chân 5 | SW1 — Switch node channel 1 |
| Chân 6 | PGND — Power ground |
| Chân 7 | SW2 — Switch node channel 2 |
| Chân 8 | FB2 — Feedback for channel 2 |
| Chân 9 | EN2 — Enable for channel 2 |
| Chân 10 | SW3 — Switch node channel 3 |
| Chân 11 | FB3 — Feedback for channel 3 |
| Chân 12 | EN3 — Enable for channel 3 |
| Chân 13 | SW4 — Switch node channel 4 |
| Chân 14 | FB4 — Feedback for channel 4 |
| Chân 15 | EN4 — Enable for channel 4 |
| Chân 16 | PGND — Power ground |
| Chân 17 | SW5 — Switch node channel 5 |
| Chân 18 | FB5 — Feedback for channel 5 output |
| Chân 19 | EN5 — Enable for channel 5 |
| Chân 20 | PGND — Power ground |
| Chân 21 | SW6 — Switch node channel 6 |
| Chân 22 | FB6 — Feedback for channel 6 |
| Chân 23 | EN6 — Enable for channel 6 |
| Chân 24 | SW7 — Switch node channel 7 |
| Chân 25 | FB7 — Feedback for channel 7 |
| Chân 26 | EN7 — Enable for channel 7 |
| Chân 27 | SW8 — Switch node channel 8 |
| Chân 28 | FB8 — Feedback for channel 8 |
| Chân 29 | EN8 — Enable for channel 8 |
| Chân 30 | PGND — Power ground |
| Chân 31 | VCC — Internal LDO output / bypass |
| Chân 32 | AGND — Analog ground |
| Chân 33 | REF — Internal reference voltage |
| Chân 34 | COMP — Compensation node |
| Chân 35 | SS — Soft-start programming |
| Chân 36 | POK — Power-OK indicator (open-drain) |
| Chân 37 | SCL — I2C clock (or NC on hard-wired variant) |
| Chân 38 | SDA — I2C data (or NC on hard-wired variant) |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | BST1 — Bootstrap capacitor channel 1 |
| Chân 44 | BST2 — Bootstrap capacitor channel 2 |
| Chân 45 | BST3 — Bootstrap capacitor channel 3 |
| Chân 46 | BST4 — Bootstrap capacitor channel 4 |
| Chân 47 | BST5 — Bootstrap capacitor channel 5 |
| Chân 48 | BST6 — Bootstrap capacitor channel 6 |
| Chân 49 | BST7 — Bootstrap capacitor channel 7 |
| Chân 50 | BST8 — Bootstrap capacitor channel 8 |
| Chân 51 | VIN — Main input supply |
| Chân 52 | VIN — Main input supply |
| Chân 53 | PGND — Power ground |
| Chân 54 | PGND — Power ground |
| Chân 55 | PGND — Power ground |
| Chân 56 | EP — Exposed pad - thermal pad, connect to ground |
Ứng dụng tiêu biểu
MC34704AEPR2 phù hợp cho 6 Áp dụngs: Digital Still Camera (DSC) Power Supply, Portable Media Player Power Management, Handheld GPS / Navigation Device, i.MX Application Processor Board, Handheld Barcode Scanner, Portable Industrial Handheld Terminal.
Digital Still Camera (DSC) Power Supply
The MC34704AEPR2 fits DSC power architectures because it generates 5-8 rails (core, memory, I/O, analog, sensor, LCD backlight) from a single Li-Ion cell at 2.7V-5.5V. Synchronous buck topology delivers high efficiency at the camera's typical load currents, extending battery life between charges. Compared to using discrete regulators, the MC34704 reduces PCB area, BOM count, and design complexity while providing fault protection and sequencing.
Được đề xuất
Portable Media Player Power Management
Portable media players require efficient multi-rail power for the application processor, SDRAM, flash, audio codec, and display backlight. The MC34704AEPR2's 8-output configurability covers all these rails from a single Li-Ion input, and the synchronous buck topology maintains high efficiency at partial loads typical of audio playback. Integrated soft-start reduces inrush stress during track-skip and screen-on transients.
Được đề xuất
Handheld GPS / Navigation Device
Handheld GPS and PND (Personal Navigation Device) designs use i.MX or similar application processors that require 4-6 voltage domains simultaneously. The MC34704AEPR2's 8-rail capability covers core, DDR memory, GPS RF, touch controller, and audio amplifier from a 3.6V Li-Ion source. The wide 2.7V-5.5V input range tolerates the voltage drop during high TX-burst current draw without compromising regulation.
Được đề xuất
i.MX Application Processor Board
i.MX application processors require multiple synchronous buck rails at different voltages (typically 1.2V core, 1.8V DDR, 2.8V analog, 3.3V I/O). The MC34704AEPR2's configurable 5- or 8-rail modes match this requirement exactly, with sequencing support to meet i.MX power-on specifications. The 56-QFN-EP 7x7 mm package fits within the compact i.MX SoM form factor while the exposed pad manages thermal dissipation.
Được đề xuất
Handheld Barcode Scanner
Industrial handheld barcode scanners use compact application processors with stringent power budgets. The MC34704AEPR2 integrates all necessary voltage rails - core, memory, scanner LED driver supply, wireless radio supply, and battery charger interface - into a single 56-QFN-EP chip, reducing BOM and assembly cost. High efficiency at light loads extends shift-life on a single battery charge.
Được đề xuất
Portable Industrial Handheld Terminal
Portable industrial terminals combine Wi-Fi/Bluetooth radios, LCD backlights, touch controllers, and application processors on a Li-Ion-powered PCB. The MC34704AEPR2's 8-output architecture supplies each subsystem with proper sequencing and fault isolation, while the wide input range accommodates battery voltage variations during high-current Wi-Fi TX bursts. Industrial temperature operation makes it suitable for warehouse and field environments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC34704AEPR2 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC34704EP | MC34704AEPR2 |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same |
| Package | QFN-56 (7x7 mm) | QFN-56 (7x7 mm) - same | QFN-56 (7x7 mm) - same |
| Input Voltage | 2.7V - 5.5V | 2.7V - 5.5V | 2.7V - 5.5V |
| Output Channels | Up to 8 (configurable 5/8) | Up to 8 (configurable 5/8) | Up to 8 (configurable 5/8) |
| Topology | Synchronous Buck PMIC | Synchronous Buck PMIC | Synchronous Buck PMIC |
| Packaging Form | Tape & Reel (suffix R2) | Tray (no R2 suffix) | Tape & Reel (R2) |
| Target Application | Multimedia processors (DSC, PMP, i.MX) | Multimedia processors (DSC, PMP, i.MX) | Multimedia processors (DSC, PMP, i.MX) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- 8 independent output rails from a single Li-Ion input (vsDiscrete multi-regulator designs)
- Wide 2.7V-5.5V single-input range (vsPMICs requiring 3.3V minimum input)
- Integrated synchronous buck FETs with sequencing (vsPMICs requiring external FETs)
Ghi chú thiết kế
The MC34704AEPR2 uses a 56-QFN-EP package where the exposed pad is the primary thermal dissipation path. For multi-rail operation at high total output power, the exposed pad must be soldered to a PCB copper pour of at least 1 square inch with multiple thermal vias to the inner ground plane. Insufficient thermal bonding will cause the junction temperature to rise and trigger thermal shutdown under sustained load. Estimated: at 3W total output, theta_JA on a 4-layer 1-oz PCB is approximately 25 C/W.
Place input ceramic capacitors (typically 22uF X5R or larger) as close as possible to the VIN pins and PGND pins to minimize switching noise. Each switching channel requires its own input bypass capacitor on the BST pin and a Schottky-free synchronous rectifier output filter inductor and capacitor tuned to the switching channel's load current. Keep the SW (switch-node) traces short and away from sensitive analog feedback traces to avoid noise injection.
The MC34704AEPR2 is obsolete/end-of-life per current distributor data, so designers should not specify it for new production runs. For new designs, evaluate current-generation NXP multi-output PMICs such as the PF1550 or PF3000 family which offer better efficiency, smaller packages, and active technical support. If the MC34704 must be used, qualify a second-source or stockpile now because lead times can extend significantly for obsolete parts.
Thông tin tuân thủ
RoHS compliant and lead-free per DigiKey listing. REACH, halogen-free, and conflict-minerals declarations not confirmed in the available distributor data. AEC-Q100 not applicable - this is a commercial/industrial-grade part.
