TPS54335ADRCR - 4.5-28V In, 3A Sync Buck Converter | TI
MPN： TPS54335ADRCR ✓ 啟用中TPS54335ADRCR 概覽
A synchronous buck converter is a switching voltage regulator that uses high-side and low-side MOSFETs (instead of a diode) to step a higher input voltage down to a lower, tightly regulated output. Within the power management IC hierarchy, the TPS54335A sits in the switching regulator family, which achieves far higher efficiency than linear regulators (LDOs) because energy is transferred in switched inductor cycles rather than dissipated as heat.
Key features include integrated 128 mOhm high-side and 84 mOhm low-side MOSFETs supporting 3 A continuous output current, an adjustable switching frequency from 50 kHz to 1.5 MHz set by a single external resistor, and an internal 2 ms soft-start on the TPS54335A variant. TI Eco-mode circuitry pulses the converter at light loads to maintain high efficiency down to microamp-level loads, with only 2 uA shutdown current.
Technically, the device uses peak current-mode control with cycle-by-cycle overcurrent limiting, thermal shutdown, and input undervoltage lockout. The wide 4.5-28 V input accommodates 5 V, 12 V, and unregulated 24 V industrial rails. Output voltage is set by an external resistor divider from 0.8 V upward.
Typical applications include 5 V and 12 V distributed power buses, industrial automation point-of-load supplies, and consumer/appliance onboard power where small size and high efficiency matter.
Design consideration: because switching frequency is adjustable, trade efficiency (lower frequency) against inductor size and transient response (higher frequency); keep the RT resistor trace short to limit noise pickup.
This page synthesizes verified distributor pricing, drop-in alternatives, design notes, and application guidance not found in a single manufacturer datasheet.
直接替換替代品，適用於 TPS54335ADRCR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
TPS54335ADRCT
✅ 直接替換📋 參考替代品（不在目錄中）
TPS54335-1ADRCR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS54336ADRCR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS54334DRCR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS54335ADRCR 最大額定值與電氣特性
| 拓撲 | Synchronous Step-Down (Buck) Converter |
| 輸入電壓範圍 | 4.5 V to 28 V |
| 輸出電壓 | Adjustable from 0.8 V |
| 最大輸出電流 | 3 A |
| 輸出數量 | 1 |
| 切換頻率 | 50 kHz to 1.5 MHz (adjustable) |
| 高側 MOSFET 導通電阻 | 128 mOhm (integrated) |
| 低側 MOSFET 導通電阻 | 84 mOhm (integrated) |
| 軟啟動 | Internal 2 ms (TPS54335A) |
| 關機電流 | 2 uA |
| Light-Load Mode | Eco-mode |
| 工作溫度範圍 | -40C to +150C |
| 封裝 | 10-VFDFN Exposed Pad (VSON / DRC), 10 pins |
| 安裝類型 | Surface Mount |
| 輸出類型 | Positive Adjustable |
| RoHS 狀態 | Compliant |
| Control Topology | Peak Current Mode |
TPS54335ADRCR 腳位配置
| 腳位 1 | BOOT — Bootstrap capacitor connection for high-side gate driver |
| 腳位 2 | VIN — Input supply voltage, 4.5 V to 28 V |
| 腳位 3 | EN — Enable input with internal UVLO; pull high to enable |
| 腳位 4 | RT/CLK — Switching frequency programming resistor or external clock input |
| 腳位 5 | SS/TR — Soft-start / tracking pin (internal 2 ms soft-start on TPS54335A) |
| 腳位 6 | GND — Ground reference and thermal path (with exposed pad) |
| 腳位 7 | COMP — Error amplifier output for loop compensation network |
| 腳位 8 | VSENSE — Feedback input; connect to output resistor divider |
| 腳位 9 | PWRGD — Open-drain power good status output |
| 腳位 10 | PH — Switch phase node connecting integrated MOSFETs to inductor |
典型應用
TPS54335ADRCR 適用於 6 應用s: 12V Distributed Power Bus Point-of-Load, 24V Industrial Automation Supplies, 5V and 12V Onboard Appliance Power, Consumer Electronics DC-DC Regulation, LED Driver and Lighting Power Front Ends, Battery-Powered and Portable Instrumentation.
12V Distributed Power Bus Point-of-Load
The TPS54335A fits 12 V intermediate bus point-of-load conversion because its 4.5-28 V input range directly accepts 12 V rails with headroom for transients, while its integrated 128 mOhm and 84 mOhm MOSFETs deliver 3 A continuous without external power stages. In a typical 12 V to 3.3 V or 12 V to 1.8 V supply, the peak current-mode architecture provides fast load transient response for processors and FPGAs. Eco-mode keeps efficiency high when subsystem loads drop to standby, and the 2 uA shutdown current supports system-level power gating. The adjustable 50 kHz-1.5 MHz frequency lets designers choose small inductors at 1 MHz+ for dense boards or lower frequencies for peak efficiency.
推薦
24V Industrial Automation Supplies
Industrial PLCs, motor-control boards, and field I/O modules commonly run from unregulated 24 V rails that can swing well above nominal; the TPS54335A's 28 V maximum input provides direct conversion without a pre-regulator stage. Its cycle-by-cycle overcurrent limit and thermal shutdown survive fault events common in factory environments, while the wide adjustable output from 0.8 V supports 5 V logic, 3.3 V microcontroller, and low-voltage analog rails from one converter family. Setting the switching frequency below 500 kHz reduces switching losses at high continuous loads typical of industrial duty cycles, and the exposed-pad DRC package dissipates heat effectively into a ground-plane copper pour on standard industrial PCB stackups.
推薦
5V and 12V Onboard Appliance Power
White goods, HVAC controllers, and smart appliances need compact, efficient step-down conversion from mains-derived 12 V or 5 V auxiliaries; the TPS54335A's synchronous topology exceeds 90 percent efficiency at mid loads, reducing internal heat rise in sealed enclosures. The internal 2 ms soft-start eliminates the need for an external soft-start capacitor and controls inrush into downstream bulk capacitance, while Eco-mode maintains efficiency during appliance standby states subject to energy regulations. Its integrated MOSFETs shrink the bill of materials compared with controller-plus-discrete designs, and the 10-pin VSON package keeps solution size small on cost-driven two-layer appliance boards where layout area is at a premium.
推薦
Consumer Electronics DC-DC Regulation
Set-top boxes, networking peripherals, and audio-visual equipment benefit from the TPS54335A's combination of small size and low-noise potential. Running the adjustable frequency above 1 MHz moves switching harmonics away from sensitive audio and RF bands, and pushes passive components smaller for dense consumer boards. The device's 3 A capacity comfortably powers SoC cores, memory, and I/O rails simultaneously when output networks are scaled appropriately, and its peak current-mode loop is straightforward to compensate with a single Type-II network on COMP. Eco-mode reduces input draw at standby, helping products meet standby-power limits, while the 2 uA shutdown suits battery-backup and soft-off circuit paths in consumer designs.
推薦
LED Driver and Lighting Power Front Ends
The TPS54335A can serve as the regulated front-end supply for LED luminaires and signage controllers, converting 12 V or 24 V inputs down to logic and driver-supply rails with high efficiency. Its wide input tolerance handles dimmer and mains-rectified bus variation, and the adjustable frequency allows coordination with PWM dimming stages to avoid beat-frequency artifacts in visible light output. Integrated protection (overcurrent, thermal shutdown, UVLO) improves field reliability in thermally constrained luminaire housings where airflow is absent. Because the buck operates synchronously, efficiency remains high even at partial dimming levels where load current falls, thanks to Eco-mode pulse-skipping behavior at light load.
推薦
Battery-Powered and Portable Instrumentation
Portable test instruments and battery-operated sensors draw from multi-cell packs whose voltage sags over discharge; the TPS54335A's 4.5 V minimum input supports 5-cell lithium chemistries and its Eco-mode maximizes run time during low-duty measurement cycles. The 2 uA shutdown current lets the system MCU cut converter power entirely between samples. At active loads up to 3 A, the synchronous MOSFETs minimize conduction loss, extending battery life versus non-synchronous buck alternatives that lose diode drops. The exposed-pad DRC package supports compact handheld PCB layouts, and the adjustable soft-start behavior of the internal 2 ms ramp prevents excessive battery inrush current at power-up in current-limited packs.
推薦
推薦產品摘要
工程參考資料，適用於 TPS54335ADRCR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TPS54335ADRCT | TPS54335-1ADRCR | TPS54336ADRCR | TPS54334DRCR | TPS54335DDA |
|---|---|---|---|---|---|---|
| Package | VSON-10 (DRC) Exposed Pad | VSON-10 (DRC) - same | VSON-10 (DRC) - same | VSON-10 (DRC) - same | VSON-10 (DRC) - same | SO-8 PowerPAD - different footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
主要差異化特點
- Wide adjustable frequency range for design optimization (對比TPS54336ADRCR)
- Zero external soft-start component cost (對比TPS54336ADRCR)
- High efficiency from low-Rds(on) synchronous MOSFETs (對比Non-synchronous 3 A buck alternatives)
設計說明
Place the input ceramic decoupling capacitor (typically 10 uF) within 2-3 mm of VIN and GND to minimize the high-frequency loop containing the input cap, integrated high-side MOSFET, PH node, and low-side MOSFET. Keep the PH-to-inductor trace short and wide. Connect the exposed thermal pad to a solid ground plane with a 4x4 via array under the DRC package - the pad is the primary thermal and electrical ground path. Route the RT resistor away from the SW/PH node to avoid frequency jitter from switching noise coupling.
Estimated: at VIN=24 V, VOUT=5 V, and full 3 A load, converter loss of roughly 1.2-1.5 W (at ~90 percent efficiency) in the DRC package will raise junction temperature significantly above ambient; with an effective theta_JA of about 40-50 C/W on a good 2-layer layout (2 oz copper), expect a 50-75 C rise. Verify junction temperature stays below the datasheet limit at worst-case ambient, and add copper area or airflow for high-ambient industrial enclosures. Consult the TI datasheet thermal application section for the exact theta_JA of your stackup.
Do not exceed the 28 V absolute maximum input rating - unregulated 24 V industrial supplies can transient above this; add input TVS or a surge-rated input stage if the rail is unprotected. Ensure the BOOT capacitor (typically 0.1 uF) is placed directly across BOOT and PH. When using the adjustable frequency range, respect the datasheet minimum on-time constraints at high VIN to avoid pulse-skipping or output ripple degradation. Verify EN pin UVLO divider sets an appropriate turn-on threshold for your input source.
合規資訊
RoHS compliant per distributor listings. REACH, halogen-free, and conflict-minerals status not stated in provided data.
