DCP3603ACDMR
Synchronous Step-Down ConverterThe DCP3603ACDMR is a synchronous step-down converter from STMicroelectronics. View the full DCP3603ACDMR datasheet below including key specifications, pinout, electrical characteristics, absolute maximum ratings.
Manufacturer
STMicroelectronics
Category
Synchronous Step-Down Converter
Key Specifications
| Parameter | Value |
|---|---|
| Output Current | 3A |
| Switching Frequency | 1MHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Package / Case | SOT-23-6 |
| Packaging | Cut Tape |
| Standard Pack Qty | 3000 |
| Supplier Device Package | SOT-23-6 |
| Supplier Device Package | SOT-23-6 |
| Synchronous Rectifier | Yes |
| Topology | Buck |
| Input Voltage (Max) | 36V |
| Input Voltage (Min) | 3.3V |
| Output Voltage (Max) | 36V |
| Output Voltage | 0.85V |
Overview
Part: DCP3603 — STMicroelectronics
Type: Synchronous Step-Down Converter
Description: A wide-input voltage, easy-to-use synchronous buck converter capable of driving up to 3 A load current, with an extended input range from 3.3 V to 36 V, operating at 500 kHz or 1.0 MHz fixed switching frequency.
Operating Conditions:
- Supply voltage: 3.3–36 V
- Operating temperature: -40 to 150 °C
- Output current: 0–3 A
Absolute Maximum Ratings:
- Max supply voltage: 38 V
- Max junction temperature: 150 °C
- Max storage temperature: 150 °C
Key Specs:
- Feedback voltage: 0.85 V (Typ)
- Quiescent current (LCM device): 85 μA (Typ, V EN = 3.3 V, V FB = 0.9, no switching)
- Shutdown current: 4.5 μA (Typ, V EN = 0 V)
- High-side MOSFET on-resistance: 0.14 Ω (Typ, I SW = 0.1 A)
- Low-side MOSFET on-resistance: 0.08 Ω (Typ, I SW = 0.1 A)
- High-side MOSFET switch current limit: 5.1 A (Typ, V IN = 24 V)
- Low-side MOSFET switch current limit: 3.8 A (Typ, V IN = 24 V)
- Switching frequency (DCP3603Ax): 500 kHz (Typ)
- Switching frequency (DCP3603Bx): 1 MHz (Typ)
- Thermal shutdown threshold: 175 °C (Typ)
Features:
- 89% typical efficiency at 1000 mA load (V IN = 24 V, V OUT = 5 V)
- 93% typical efficiency at 1000 mA load (V IN = 12 V, V OUT = 5 V)
- 85 μA operating quiescent current
- 500 kHz or 1.0 MHz fixed switching frequency
- Synchronous rectification
- Internal compensation network
- Peak current mode control
- Two different versions: LCM for high efficiency at light loads and LNM for noise-sensitive applications
- Output overvoltage protection
- Thermal shutdown
- Precision enable
- Switching frequency dithering
Applications:
- Major appliances
- Smart metering
- Industrial 12/24 V bus conversion
Package:
- SOT23-6L
Features
- 89% typical efficiency at 1000 mA load (V IN = 24 V, V OUT = 5 V)
- 93% typical efficiency at 1000 mA load (V IN = 12 V, V OUT = 5 V)
- 3.3 V to 36 V input operating voltage range
- Up to 3 A output current capability
- 85 μA operating quiescent current
- 500 kHz or 1.0 MHz fixed switching frequency
- Synchronous rectification
- Internal compensation network
- Peak current mode control
- Two different versions: LCM for high efficiency at light loads and LNM for noise-sensitive applications
- Output overvoltage protection
- Thermal shutdown
- Precision enable
- Switching frequency dithering
- Available in SOT23-6L package
Applications
- Major appliances
- Smart metering
- Industrial 12/24 V bus conversion
Pin Configuration
DCP3603ACDMR — SOT23-6L Package Pinout
| Pin Number | Pin Name | Type | Description |
|---|---|---|---|
| 1 | BOOT | P | Bootstrap. Connect a capacitor between SW and BOOT to form a floating supply across the high-side switch driver. A 100 nF low ESR ceramic capacitor is recommended. |
| 2 | GND | P | System ground. GND is the reference ground of the regulated output voltage. Care must be taken during PCB layout. Use wide PCB traces to make the connection. |
| 3 | FB | I | Feedback. An external resistor divider from the output to GND, tapped to FB, sets the output voltage. It is recommended to place the resistor divider as close as possible to the FB pin. |
| 4 | EN | I | Enable. Precision enable pin. If the EN voltage is below 0.95 V, the converter is in shutdown mode with all functions disabled. Cannot be left floating. |
| 5 | VIN | P | Input voltage. VIN supplies power for the internal MOSFET, regulator, and the embedded analog circuitry. Input capacitors are needed to decouple the input rail. Use wide PCB traces to make the connection. |
| 6 | SW | O | Switch output. Connect SW to the inductor and bootstrap capacitor. SW is driven up to VIN by the high-side switch during the on-time of the PWM duty cycle. The inductor current drives SW low during the off-time. Use wide PCB traces to make the connection. |
Notes
- Package: SOT23-6L (6-pin small outline transistor package)
- Part variant: DCP3603ACDMR is the 500 kHz fixed switching frequency version (DCP3603Ax family per Table 7)
- Power pins: VIN (pin 5) and GND (pin 2) require wide PCB traces and careful layout due to high current switching
- Bootstrap pin: BOOT (pin 1) must be connected to a 100 nF low-ESR ceramic capacitor between SW and BOOT
- Enable pin: EN (pin 4) cannot be left floating; typical connection is to VIN for self-startup
- Feedback network: FB (pin 3) requires external resistor divider placed close to the pin to minimize noise coupling
Electrical Characteristics
TJ = 25 °C, V IN = 24 V, unless otherwise specified.
Table 7. Electrical characteristics
| Symbol | Parameter | Test conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| V FB | Feedback voltage | 0.833 | 0.85 | 0.867 | V | |
| I Q | Quiescent current | V EN = 3.3 V, V FB = 0.9 (no switching), LCM device | 85 | 120 | μA | |
| I Q | Quiescent current | V EN = 3.3 V, V FB = 0.9 (no switching), LNM device | 1.4 | mA | ||
| I SD | Shutdown current | V EN = 0 V | 4.5 | 8 | μA | |
| I SKIP | Skip current limit | 0.8 | A | |||
| I VY_SINK | Reverse current limit | LNM or V OUT overvoltage | 1.2 | 1.5 | 1.75 | A |
| V UVLO | Undervoltage lockout threshold | V IN rising | 2.85 | 3.2 | V | |
| V UVLO | Undervoltage lockout threshold | V IN falling | 2.6 | 2.9 | V | |
| V EN | Enable threshold | V EN rising | 1.1 | 1.23 | 1.35 | V |
| V EN | Enable threshold | V EN falling | 0.95 | 1.1 | 1.22 | V |
| I LKG_EN | Enable input leakage current | V EN = 3.3 V | 10 | 100 | nA | |
| I LKG_EN | Enable input leakage current | V IN = V EN = 36 V | 20 | |||
| I LKG_FB | Feedback input leakage current | V FB = 1.2 V | 0.2 | nA | ||
| R DS_ON_HS | High-side MOSFET on-resistance | I SW = 0.1 A | 0.14 | 0.21 | Ω | |
| R DS_ON_LS | Low-side MOSFET on-resistance | I SW = 0.1 A | 0.08 | 0.14 | ||
| I LIM_HS | High-side MOSFET switch current limit | V IN = 24 V | 4 | 5.1 | 6.3 | A |
| I LIM_LS | Low-side MOSFET switch current limit | V IN = 24 V | 3.2 | 3.8 | 4.5 | A |
| t ON_MIN | Minimum switch-on time | on SW pin | 90 | ns | ||
| t OFF_MIN | Minimum switch-off time | on SW pin | 135 | ns | ||
| t SS | Internal soft-start time | 1.3 | ms | |||
| F SW | Switching frequency | DCP3603Ax | 400 | 500 | 600 | kHz |
| F SW | Switching frequency | DCP3603Bx | 0.8 | 1 | 1.2 | MHz |
| T SD | Thermal shutdown threshold | 175 | °C | |||
| T SD_REC | Thermal recovery threshold | 155 | °C | |||
| V OVP | Overvoltage threshold (V OVP /V FB ) | 120 | % | |||
| V OVP_HYST | Overvoltage hysteresis | 8 | % |
Table 7. Electrical characteristics
Absolute Maximum Ratings
Table 3. Absolute maximum ratings
| Symbol | Parameter | Value | Unit |
|---|---|---|---|
| V IN | Power supply voltage | - 0.3 to + 38 | V |
| V EN | Enable input voltage | - 0.3 to V IN +0.3 | V |
| V FB | Feedback pin voltage | - 0.3 to + 1.5 | V |
| V BOOT-SW | Boot to SW differential voltage | - 0.3 to + 5.5 | V |
| SW | Switching node voltage DC | - 0.3 to V IN +0.3 | V |
| T J | Operating junction temperature | - 40 to 150 | °C |
| T STG | Storage temperature | - 55 to 150 | °C |
Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not guaranteed.
Table 4. Thermal data
| Symbol | Parameter | SOT23-6L | Unit |
|---|---|---|---|
| R thJA | Thermal resistance junction-ambient | 117 | |
| R θJC(top) | Junction-to-case (top) thermal resistance | 117 | |
| R θJB | Junction-to-board thermal resistance | 32 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 13 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 32 | °C/W |
Note: These values were calculated in accordance with JESD specification and simulated on a 4-layer JEDEC board.
Table 5. Recommended operating conditions
| Symbol | Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| V IN | Input supply voltage | 3.3 | 36 | V | |
| V EN | Enable supply voltage (1) | 0 | V IN | V | |
| I OUT | Output current | 0 | 3 | A |
Table 6. ESD ratings
| Symbol | Parameter | Value | Unit |
|---|---|---|---|
| V ESD | Human body model (HBM) | ±2000 | V |
| V ESD | Charged device model (CDM) | ±500 | V |
Table 6. ESD ratings
Thermal Information
The shutdown block disables the switching activity if the junction temperature is higher than a fixed internal threshold (TSH refer to Table 7). The thermal sensing element is close to the power elements, ensuring fast and accurate temperature detection. A hysteresis of approximately 20 °C prevents the device from turning ON and OFF too fast. After a thermal protection event is expired, the DCP3603 restarts with a new soft-start.
Typical Application
Table 1. Typical external components
Table 1. Typical external components
| VOUT | Switching frequency | L | CIN (1) | COUT (1) | CBOOT (1) | R1 | R2 |
|---|---|---|---|---|---|---|---|
| 5.0 V | 1 MHz | 3.3 μH | 2.2 μF / 50 V | 22 μF / 25 V | 100 nF / 50 V | 73.2 kΩ | 15 kΩ |
| 5.0 V | 1 MHz | XGL5050-332 - Coilcraft | 2.2 μF / 50 V | C2012X5R1E226M125A - TDK | C1608X7R1H104K080AA -TDK | 73.2 kΩ | 15 kΩ |
| 5.0 V | 1 MHz | 744393305033 - Wurth | 2.2 μF / 50 V | 885012107018 - Wurth | 885012206095 - Wurth | 73.2 kΩ | 15 kΩ |
| 5.0 V | 500 kHz | 6.8 μH | 2.2 μF / 50 V | 2 x 22 μF / 25 V | 100 nF / 50 V | 73.2 kΩ | 15 kΩ |
| 5.0 V | 500 kHz | XGL5050-682 - Coilcraft | 2.2 μF / 50 V | C2012X5R1E226M125A - TDK | C1608X7R1H104K080AA -TDK | 73.2 kΩ | 15 kΩ |
| 3.3 V | 1 MHz | 2.2 μH | C2012X7R1H225K125AC - TDK | 22 μF / 25 V | 86.6 | 30 | |
| 3.3 V | 1 MHz | XGL5050-222 - Coilcraft | C2012X7R1H225K125AC - TDK | C2012X5R1E226M125A - TDK | 100 nF / 50 V | 86.6 | 30 |
| 3.3 V | 500 kHz | 5.6 μH | C2012X7R1H225K125AC - TDK | 2 x 22 μF / 25 V | C1608X7R1H104K080AA -TDK | kΩ | kΩ |
| 3.3 V | 500 kHz | XGL5050-562 - Coilcraft | C2012X7R1H225K125AC - TDK | C2012X5R1E226M125A - TDK | C1608X7R1H104K080AA -TDK | kΩ | kΩ |
Package Information
To meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions, and product status are available at: www.st.com. ECOPACK is an ST trademark.
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| DCP3603 | STMicroelectronics | — |
| DCP3603A | STMicroelectronics | — |
| DCP3603AC | STMicroelectronics | — |
| DCP3603ACMR | STMicroelectronics | — |
| DCP3603ANDMR | STMicroelectronics | |
| DCP3603ANMR | STMicroelectronics | — |
| DCP3603AX | STMicroelectronics | — |
| DCP3603B | STMicroelectronics | — |
| DCP3603BC | STMicroelectronics | — |
| DCP3603BCDMR | STMicroelectronics | |
| DCP3603BCMR | STMicroelectronics | SOT-23-6 |
| DCP3603BNDMR | STMicroelectronics | |
| DCP3603BNMR | STMicroelectronics | |
| DCP3603BX | STMicroelectronics | — |
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