Product overview
Description
The ST1S40 is an internally compensated 850 kHz fixed-frequency PWM synchronous step-down regulator. ST1S40 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.
The ST1S40 integrates a 95 mΩ high side switch and 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.
The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.
The ST1S40 is available in VFQFPN 4 mm x 4 mm 8 lead package, HSOP-8 and standard SO-8 package.
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All features
- 3 A DC output current
- 4.0 V to 18 V input voltage
- Output voltage adjustable from 0.8 V
- 850 kHz switching frequency
- Internal soft-start
- Integrated 95 mΩ and 69 mΩ Power MOSFETs
- All ceramic capacitor
- Enable
- Cycle-by-cycle current limiting
- Current fold back short-circuit protection
- VFQFPN4x4-8L, HSOP-8, and SO-8 and packages
eDesignSuite
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Power Management Design Center
Power Supply Design Tool
SMPS design, by topology, by type and by product PFC design with analog and digitial control Supports various PCB configurations 
LED Lighting Design Tool
Handles AC-DC and DC-DC design in common topologies Displays interactive and annotated schematic Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data 
Power Tree Designer
Specify input/output power for each node in the tree Check for consistency Design each individual node Start your design with the ST1S40 now
xwith our eDesignSuite online design aid utilities and simulation tools.
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STMicroelectronics - ST1S40
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3D models
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| ST1S40IDR | Active | SO-8 | Industrial | Ecopack2 | |
| ST1S40IPHR | Active | PowerSO-8 | Industrial | Ecopack2 | |
| ST1S40IPUR | Active | DFN8 4x4 | 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
| Part Number | Order from distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| ST1S40IPHR | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | PowerSO-8 | - | - | PHILIPPINES | | ||
| ST1S40IDR | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | SO-8 | - | - | CHINA | | ||
| ST1S40IPUR | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | DFN8 4x4 | - | - | MALAYSIA | | ||
(*) 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