Product overview
Description
The PM6644 is a 350 mA valley current limit step-down regulator capable of delivering an adjustable output voltage in the range between 0.9 V and 8 V. A fixed value of output voltage is also available (3.47 V), saving the external resistor divider. It is housed in a small DFN10 3x3 package. The switching regulator is based on COT (constant-on-time) architecture, that assures fast load transient response; the embedded voltage feed-forward provides nearly constant switching frequency operation. The pulse skipping technique increases efficiency at very light load. The switching frequency can be adjusted from 200 kHz to 600 kHz through a simple resistor. The switching regulator can be programmed to regulate a fixed value of 3.47 V or it can deliver an adjustable voltage, depending on the FB pin set-up.
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All features
- 4.5 V to 25 V input voltage range
- Output voltage VOUT: fixed 3.47 V or adjustable 0.9 V to 8 V
- 350 mA valley current limit
- Constant-on-time control
- Programmable switching frequency
- Pulse skipping mode (skip mode) at light loads
- Independent EN signals
- Latched OVP and UVP
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STMicroelectronics - PM6644
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|
| PM6644TR | Active Product is in volume production. | VDFPN 10 3x3x1.0 | Industrial | Ecopack2 | - | - |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Budgetary Price (US$)*/Qty | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM6644TR | No availability of distributors reported, please contact our sales office | Active | VDFPN 10 3x3x1.0 | Tape and Reel | SINGAPORE | EAR99 | NEC | - | - | |
Buy Direct at ST (*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors