LTC3221EDC-5 - 60mA 5V Micropower Charge Pump | Analog Devices
料号： LTC3221EDC-5 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.36 | $236.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.86 | $1,860.00 |
LTC3221EDC-5 概述
A charge pump is a type of switched-capacitor voltage converter that moves charge between capacitors using MOSFET switches to step a DC voltage up, down, or invert it without magnetic components. Within the broader power management IC hierarchy, the LTC3221 sits in the family of DC-DC converters (specifically non-magnetic switching regulators) and is intended for low-noise, low-EMI point-of-load rails in space-constrained battery-powered designs where inductor selection, layout, and audible noise are unacceptable trade-offs.
Key features include 5V +/-4% regulated output (LTC3221-5 fixed version), 60mA output current, 8uA quiescent current, and very low shutdown current drawn from VIN. The device also features an SHDN logic pin for shutdown, comes in a tiny 2mm x 2mm DFN-6 (DC) package with exposed pad, and offers pin-selectable doubler/inverter configuration. The exposed thermal pad must be soldered to the PCB ground plane to meet thermal ratings and to provide the low-impedance return required by the charge-pump switches.
The architecture is a 1.5x/2x switched-capacitor doubler for the -5 variant, achieving regulation via an internal bandgap reference and comparator-controlled switch timing. Without an inductor, the LTC3221-5 produces lower radiated EMI than inductor-based boost converters, making it ideal for RF and audio-adjacent supplies where switching noise must be minimized. The trade-off is reduced efficiency versus inductive boost at high load, so it is optimized for low-current rails up to 60mA.
Typical applications include biasing LEDs from a single Li-ion cell, generating a clean 5V analog rail in portable instruments, and providing a low-ripple supply for sensors, op-amps, or low-power RF transceivers. The fixed 5V version simplifies design where downstream ICs require a stable 5V regardless of VIN above or below 5V.
When designing with this part, place the four external flying capacitors and bypass capacitors as close as possible to the VIN, CPO, CPO-, VOUT, and GND pins. The exposed pad must be soldered for both thermal dissipation and electrical ground, and SHDN must be tied to VIN for always-on operation or driven by a logic signal for sequencing.
直接替换替代料： LTC3221EDC-5 ——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：
LTC3221EDC-5#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3221EDC-5#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3221EDC-5#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3221EDC-3.3
✅ 直接替换📋 参考替代料（不在目录中）
LTC3221EDC
✅ 直接替换📋 参考替代料（不在目录中）
LTC3221EDC-5 最大额定值与电气特性
| 拓扑 | Charge Pump (Switched-Capacitor) Doubler/Inverter |
| 输出类型 | Fixed 5V (LTC3221-5 variant) |
| 输出电压 | 5 V +/-4% |
| 输出数量 | 1 |
| 输入电压范围 | 2.5 V to 5.5 V |
| 最大输出电流 | 60 mA |
| 静态电流 | 8 uA (typical) |
| Configuration Function | Doubler / Inverter |
| 工作温度范围 | 0C to +70C (commercial); -40C to +85C by design/characterization |
| 封装 | 6-pin DFN (2 mm x 2 mm, 0.75 mm height) with exposed pad |
| 安装类型 | Surface Mount |
| External Inductor Required | No (switched-capacitor topology) |
| Shutdown Pin | Yes (active-low, logic low = shutdown) |
| RoHS 状态 | Compliant (PBF suffix) |
| JEDEC Package Outline | MO-229WCCD-2 (per DigChip entry) |
LTC3221EDC-5 引脚配置
| 引脚 1 | SHDN — Shutdown logic input; tie to VIN for always-on operation (LTC3221-5) |
| 引脚 2 | VIN — Input supply voltage, 2.5V to 5.5V |
| 引脚 3 | CPO+ — Charge pump flying capacitor positive terminal |
| 引脚 4 | GND — Ground / exposed pad (must be soldered) |
| 引脚 5 | CPO- — Charge pump flying capacitor negative terminal |
| 引脚 6 | VOUT — Regulated output voltage, fixed 5V (LTC3221-5) |
典型应用
LTC3221EDC-5 适用于 6 应用s: Battery-Powered LED Bias Supply, Portable Instrument 5V Analog Rail, IoT Sensor Node Auxiliary Supply, Low-EMI RF Transceiver Bias Rail, USB-Powered 5V Generation from 2-Cell Input, Wearable / Hearable Device Power.
Battery-Powered LED Bias Supply
The LTC3221EDC-5 fits battery-powered LED biasing because its fixed 5V output and 60mA current directly drive indicator or backlight LEDs from a single Li-ion cell (3.0V to 4.2V, VT). Unlike inductive boost converters that require a 4.7uH or larger inductor plus EMI filtering, the LTC3221-5 needs only four small ceramic capacitors and an exposed pad, reducing solution area below 25mm squared. Its 8uA quiescent current keeps standby drain negligible when LEDs are off via SHDN, materially extending battery life in always-on IoT devices. The 5V headroom also tolerates LED Vf up to 4.5V with series resistor.
推荐
Portable Instrument 5V Analog Rail
The LTC3221EDC-5 generates a clean 5V analog rail from a single Li-ion or 2xAA battery for portable instruments such as handheld multimeters, data loggers, and field sensors. Its 5V fixed output is the de-facto supply for legacy op-amps, sensor bridges, and reference ICs that require headroom above 3.3V. The 8uA quiescent current keeps idle drain low, and the inductor-free design eliminates audible noise from magnetostriction - critical for handheld medical and measurement devices. The 6-pin DFN package keeps the converter under 4mm squared, leaving room for analog front-end circuitry.
推荐
IoT Sensor Node Auxiliary Supply
For IoT sensor nodes, the LTC3221EDC-5 generates the 5V auxiliary rail needed by analog sensor front-ends (e.g. NDIR CO2 sensors, MEMS microphones with integrated pre-amps) from a 3.6V Li-ion primary cell. The 60mA load capability covers analog sensor bias plus a low-power microcontroller ADC reference, while the 8uA quiescent current is below typical battery self-discharge rates. The SHDN pin enables software-controlled sleep, and the tiny DFN footprint fits beneath an SoC package. EMI-free operation is also valuable when the same board hosts a sub-GHz or 2.4GHz radio.
推荐
Low-EMI RF Transceiver Bias Rail
The LTC3221EDC-5 powers noise-sensitive RF transceivers and PLLs by providing a clean 5V rail from a 3.3V system supply. Its switched-capacitor topology produces no inductor switching transients, unlike boost converters whose switching spikes couple into VCO tank circuits and degrade phase noise. The fixed 5V output is also useful for legacy RF front-end modules that require a 5V LNA or mixer bias. With 60mA available, it can supply a small LNA, mixer, and IF amplifier chain. The exposed pad keeps thermal rise minimal even at full 60mA continuous load at 3.6V VIN.
推荐
USB-Powered 5V Generation from 2-Cell Input
When a system is powered from 2x AA cells (3.0V nominal, dipping to 2.5V) but downstream USB or legacy 5V circuitry requires a stable 5V, the LTC3221EDC-5 charges capacitors in doubler configuration to deliver 5V at 60mA. The Analog Devices 3221f.pdf datasheet explicitly supports this topology. The wide 2.5V to 5.5V input range means the converter operates across the entire discharge curve of the cells, and the 8uA quiescent current does not waste energy when the 5V rail is not needed. The SHDN pin lets a host MCU disable the rail entirely.
推荐
Wearable / Hearable Device Power
The LTC3221EDC-5 is well suited to wearable and hearable devices that need a 5V rail to bias MEMS microphones, Class-D audio pre-drivers, or haptic drivers from a single 3.7V Li-ion cell. Its 2mm x 2mm DFN footprint fits under an SoC or BGA package, and its 8uA quiescent current preserves battery life between audio events. The absence of inductors eliminates audible magnetic noise - a key requirement for in-ear audio devices. The exposed pad provides thermal dissipation for sustained 60mA loads during haptic events.
推荐
推荐产品汇总
工程参考数据： LTC3221EDC-5 ——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 | LTC3221EDC-5#PBF | LTC3221EDC-5#TRPBF | LTC3221EDC-5#TRMPBF | LTC3221EDC-3.3 | LTC3221EDC |
|---|---|---|---|---|---|---|
| Package | 6-pin DFN (2x2 mm, DC) | 6-pin DFN (2x2 mm, DC) - same | 6-pin DFN (2x2 mm, DC) - same | 6-pin DFN (2x2 mm, DC) - same | 6-pin DFN (2x2 mm, DC) - same | 6-pin DFN (2x2 mm, DC) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Topology | Charge Pump Doubler | Charge Pump Doubler - same | Charge Pump Doubler - same | Charge Pump Doubler - same | Charge Pump Doubler - same | Charge Pump Doubler/Inverter - same family |
| Output Voltage | 5 V fixed | 5 V fixed | 5 V fixed | 5 V fixed | 3.3 V fixed | Adjustable (3V demo default) |
| Quiescent Current | 8 uA | 8 uA | 8 uA | 8 uA | 8 uA | 8 uA (same family) |
| External Inductor | No | No | No | No | No | No |
| Shipping Packaging | Tape & Reel (#TRPBF standard) | Tube / Tray | Tape & Reel, 7-inch | Tape & Reel, 500-piece mini-reel | Tape & Reel (#TRPBF) | Tape & Reel (#TRPBF) |
关键差异点
- Inductor-free, lowest-EMI 5V generation in 6-pin DFN （对比 LT1931AIS5#TRPBF inductive boost)
- Ultra-low 8uA quiescent current （对比 Typical inductive boost converters (200uA to 1mA Iq))
- Same-package siblings for fixed 3.3V and adjustable outputs （对比 LTC3221EDC-3.3 (fixed 3.3V, same DFN-6))
设计说明
Place the four external flying capacitors (CPO+, CPO-) and the VOUT bypass capacitor as close as possible to the LTC3221EDC-5 pins. The exposed pad MUST be soldered to a PCB ground pour for both thermal dissipation and the low-impedance ground return required by the internal charge-pump switches. Use 1uF or larger X5R/X7R ceramic capacitors (e.g. Murata GRM188R71C105KA12) for all flying and bypass positions to minimize voltage ripple on the 5V output.
Estimated: at 3.6V VIN, 5V VOUT, and 60mA continuous load, the LTC3221-5 dissipates roughly (VOUT - VIN) x IOUT = (5 - 3.6) x 0.06 = 0.084W in worst-case step-up operation. The 6-pin DFN exposed pad has a theta_JA around 60 C/W on a 1oz 4-layer 1sq-inch copper pour, giving a 5C junction temperature rise - well within the 0C to 70C commercial spec. For sustained 60mA loads, ensure adequate ground copper area under the exposed pad.
Do not exceed the absolute maximum VIN of 6V on the LTC3221EDC-5. Tie SHDN to VIN for always-on operation; floating SHDN can leave the part in an undefined state. The flying capacitors between CPO+ and CPO- MUST be rated for the VIN voltage plus margin (6.3V or 10V X7R recommended). Note that the LTC3221-3.3 is NOT a drop-in for the LTC3221-5 - output voltage is fixed at the silicon level and cannot be reconfigured externally.
合规信息
RoHS compliant per Analog Devices PBF suffix designation. Commercial-grade temperature range 0C to 70C (commercial); not qualified for automotive AEC-Q100. Halogen-free status not stated in the provided web data.
