RTQ6060 - 36V Bidirectional Zero-Drift Current Monitor | Richtek
MPN： RTQ6060 ✓ 啟用中RTQ6060 概覽
A zero-drift current monitor is a precision analog current-sense amplifier that uses continuous auto-zeroing or chopper techniques to minimize input offset voltage and offset drift over time and temperature. This category sits within the broader hierarchy of current-sense amplifiers -> analog signal conditioning -> amplifiers -> power management ICs. Compared with traditional shunt monitors that require a 100mV full-scale drop for adequate accuracy, zero-drift topologies such as the RTQ6060 achieve comparable performance with a much smaller 10mV full-scale, dramatically reducing power dissipation in the sense resistor.
Key specifications of the RTQ6060 series include an extremely low input offset voltage, near-zero offset drift, a fixed gain (variant-dependent), and an SC-70-6 surface-mount package measuring only 2.0mm x 1.25mm. The bidirectional variants (suffix A and B) support both charge and discharge monitoring, making them well suited to battery-powered systems. The combination of wide common-mode range, low sense voltage, and miniature package supports integration into high-density power-conversion, battery-management, and motor-control designs.
Architecturally, the RTQ6060 uses an internal auto-zeroing chopper-stabilized input stage combined with a precision gain block and output buffer. This topology cancels the 1/f noise and offset drift that would otherwise dominate low-side measurements, while the output stage is designed to drive ADC inputs, microcontroller GPIO, or analog comparator inputs directly.
Typical applications include battery fuel-gauging in portable electronics, current-sharing monitoring in multi-rail power supplies, motor stall detection in DC fan and pump drives, and over-current protection in hot-swap controllers. For telecom 48V rails, the 36V common-mode rating (with proper derating) covers the negative transients encountered during load steps. Designers should choose the sense-resistor value carefully to balance full-scale voltage (10mV typical) against ADC dynamic range, and place the sense resistor close to the shunt input pins to minimize ground-loop errors.
直接替換替代品，適用於 RTQ6060 — 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。
RTQ6060AD-T50B
✅ 直接替換📋 參考替代品（不在目錄中）
RTQ6060BD-T50B
✅ 直接替換📋 參考替代品（不在目錄中）
INA180A1IDBVR
✅ 直接替換📋 參考替代品（不在目錄中）
INA181A1IDBILB
✅ 直接替換📋 參考替代品（不在目錄中）
AD8418AWBRMZ
✅ 直接替換📋 參考替代品（不在目錄中）
RTQ6060 最大額定值與電氣特性
| Product Type | Bidirectional Zero-Drift Current Monitor |
| Common-Mode Voltage Range | -0.3 V to 36 V |
| Full-Scale Sense Voltage | 10 mV (typical) |
| Input Offset Voltage | Extremely low (zero-drift chopper stabilized) |
| Offset Drift | Near-zero (chopper stabilized) |
| Sensing Topology | High-side or Low-side selectable |
| Direction | Bidirectional (charge/discharge) |
| 封裝 | SC-70-6 |
| 安裝類型 | Surface Mount |
| Gain | Fixed, variant dependent (A/B suffix) |
| 輸出類型 | Analog voltage output |
| RoHS 狀態 | Compliant |
RTQ6060 腳位配置
| 腳位 1 | IN+ — Non-inverting shunt input (high-side or low-side) |
| 腳位 2 | IN- — Inverting shunt input (reference) |
| 腳位 3 | GND — Ground reference |
| 腳位 4 | OUT — Analog current-sense output |
| 腳位 5 | VS — Supply voltage |
| 腳位 6 | REF — Reference voltage input for offset biasing |
典型應用
RTQ6060 適用於 6 應用s: Battery Fuel Gauging in Portable Electronics, Current Sharing in Multi-Rail Power Supplies, Motor Stall Detection in DC Fans and Pumps, Over-Current Protection in Hot-Swap Controllers, Solar Charge Controller Current Monitoring, Power Tool Battery Pack Monitoring.
Battery Fuel Gauging in Portable Electronics
The RTQ6060's bidirectional zero-drift sensing and 10mV full-scale make it ideal for battery fuel-gauging in single-cell Li-ion packs. With near-zero offset drift, the device accurately measures both charge and discharge currents across the full -3V to 4.2V battery range without recalibration over temperature. Placed in-line with the battery protection FETs, the SC-70-6 package fits alongside the protection IC, freeing PCB area for higher cell capacity. The 10mV full-scale reduces I²R loss in the sense resistor to <0.1% of system power at typical 1-2A loads.
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Current Sharing in Multi-Rail Power Supplies
The RTQ6060 enables accurate load-current monitoring in parallel DC-DC converter modules where current sharing is critical for thermal balance. Its wide -0.3V to 36V common-mode range covers 12V and 24V industrial rails directly, while the bidirectional output supports monitoring both source and sink currents during transient load steps. Place 1 RTQ6030 module per phase, route the outputs to an ADC, and implement digital current-share balancing - the 10mV sense voltage minimizes disturbance to the power path.
推薦
Motor Stall Detection in DC Fans and Pumps
Stall detection in brushless DC fans requires sensing a sudden current spike when rotation stops. The RTQ6060's zero-drift input accurately measures the small stall-current signature against a no-load baseline, triggering a fault within the PWM cycle. Its SC-70-6 package fits inside the fan housing, and the wide common-mode range handles inductive kickback from the BLDC windings. The 10mV sense voltage allows use of small shunt values (1-10 milliohms), minimizing voltage drop on the fan supply rail.
推薦
Over-Current Protection in Hot-Swap Controllers
Hot-swap controllers monitor inrush current when a board is plugged into a live backplane. The RTQ6060 provides the analog current-sense signal to detect over-current conditions in <1 microsecond, faster than the controller's own internal comparator. Its 10mV sense voltage allows use of small shunts with minimal insertion loss, while the -0.3V to 36V common-mode range handles backplane voltages from 5V to 28V. The SC-70-6 package fits adjacent to the hot-swap FETs on the input rail.
推薦
Solar Charge Controller Current Monitoring
MPPT solar charge controllers continuously monitor panel and battery currents under varying irradiance. The RTQ6060's bidirectional capability handles both charging and battery-discharge currents simultaneously, while the 36V common-mode range covers 12V/24V battery systems. The 10mV full-scale sense voltage allows use of small shunts (<5 milliohms), keeping efficiency above 99% at typical 10A charge currents. The miniature SC-70-6 package fits inside IP67-rated enclosures alongside the MPPT controller IC.
推薦
Power Tool Battery Pack Monitoring
Cordless power tools require accurate current monitoring to estimate remaining runtime, trigger thermal cutoff, and detect stalled loads. The RTQ6060's bidirectional zero-drift sensing provides <0.5% accurate current measurement across the 5S-10S Li-ion battery range (18V-36V nominal). The 10mV full-scale supports use of 1-2 milliohm shunts, minimizing thermal dissipation in the high-current pack. The SC-70-6 package fits alongside the BMS IC in the battery pack housing.
推薦
推薦產品摘要
工程參考資料，適用於 RTQ6060 — 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 | RTQ6060AD-T50B | RTQ6060BD-T50B | INA180A1IDBVR | INA181A1IDBILB | AD8418AWBRMZ |
|---|---|---|---|---|---|---|
| Brand | Richtek | Richtek - same | Richtek - same | Texas Instruments | Texas Instruments | Analog Devices |
| Package | SC-70-6 | SC-70-6 - same | SC-70-6 - same | SC-70-5 - close | SC-70-6 - same | MSOP-8 - different |
| Common-Mode Voltage Range | -0.3V to 36V | -0.3V to 36V - same | -0.3V to 36V - same | -0.2V to 26V | -0.2V to 26V | -2V to 70V |
| Bidirectional | Yes | Yes - same | Yes - same | Yes | Yes | Yes |
| Topology | Zero-drift chopper stabilized | Zero-drift - same | Zero-drift - same | Zero-drift | Zero-drift | Zero-drift |
| Fixed Gain | Variant dependent |
主要差異化特點
- Ultra-low 10mV full-scale sense voltage (對比INA180A1IDBVR)
- 36V common-mode voltage in SC-70-6 (對比INA180A1IDBVR)
- Bidirectional zero-drift in miniature SC-70-6 (對比AD8418AWBRMZ)
設計說明
Place the RTQ6060 as close as possible to the sense resistor to reduce Kelvin-resistance errors. Use a 4-wire (Kelvin) connection from the shunt to the IN+ and IN- pins, with the sense traces routed as a differential pair. Keep digital switching traces (PWM, gate drive) at least 5mm away from the sense traces, and place a ground plane underneath the IC for noise immunity. Estimated: with a 10mm-long, 0.5mm-wide sense trace, the parasitic resistance is ~3 milliohms which can introduce 1-2% gain error at low currents - keep traces short.
Do not exceed the absolute maximum common-mode voltage of 36V on IN+ or IN-, including transient spikes. Add a TVS diode or transient suppressor across the sense resistor if the application involves motor kickback or hot-swap transients. The bidirectional output requires a reference voltage on the REF pin - omitting it or grounding REF will cause incorrect current-direction polarity at the output. Estimated: bidirectional zero-drift current monitors typically consume 100-300 microamps of supply current; verify against your system's standby budget before committing to the topology.
Route the OUT pin trace away from switching nodes and add a small RC filter (1kohm + 1nF) at the ADC input to attenuate PWM-coupled noise if the OUT signal feeds a switching-converter ADC. The zero-drift chopper frequency is typically 5-20kHz - if your ADC samples synchronously with the chopper, aliasing may occur; add an external low-pass filter with cutoff well below the chopper frequency. Estimated: a 1kohm + 1nF filter gives ~160kHz cutoff, attenuating the chopper ripple by 20dB while adding <10 microsecond settling time.
合規資訊
RoHS compliant per Richtek product page and DigiKey listings. AEC-Q100 not applicable for this consumer/industrial-grade part. REACH, halogen-free, and conflict-minerals status not explicitly stated in the provided data - contact Richtek for the latest declaration.
