MP2315
Synchronous Buck ConverterThe MP2315 is a synchronous buck converter from Monolithic Power Systems (MPS). View the full MP2315 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Manufacturer
Monolithic Power Systems (MPS)
Category
Synchronous Buck Converter
Key Specifications
| Parameter | Value |
|---|---|
| Output Current | 3A |
| Switching Frequency | 500kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Package / Case | SOT-23-8 Thin, TSOT-23-8 |
| Packaging | Cut Tape |
| Standard Pack Qty | 3000 |
| Supplier Device Package | TSOT-23-8 |
| Synchronous Rectifier | Yes |
| Topology | Buck |
| Input Voltage (Max) | 24V |
| Input Voltage (Min) | 4.5V |
| Output Voltage (Max) | 22.8V |
| Output Voltage | 0.8V |
Overview
Part: MP2315S — Monolithic Power Systems, Inc.
Type: Synchronous Buck Converter
Description: A high-efficiency, synchronous, rectified, step-down switch mode converter offering 3A continuous output current over a 4.5V to 24V input supply range with internal power MOSFETs and fixed 500kHz switching frequency.
Operating Conditions:
- Supply voltage: 4.5V to 24V
- Operating temperature: -40°C to +125°C (junction)
- Output voltage: 0.8V to V IN * D MAX
- Switching frequency: 500kHz
Absolute Maximum Ratings:
- Max supply voltage: 26V
- Max junction temperature: 150°C
- Max storage temperature: -65°C to 150°C
Key Specs:
- HS switch on resistance: 110 mΩ (Typ, V BST-SW = 5V)
- LS switch on resistance: 55 mΩ (Typ, V CC = 5V)
- Current limit: 4.5 A (Min) to 6.5 A (Max) at 40% duty cycle
- Oscillator frequency: 400 kHz (Min) to 600 kHz (Max)
- Feedback voltage: 783 mV (Min) to 800 mV (Max)
- Quiescent supply current: 120 μA (Typ, V EN = 2V, V FB = 0.85V, AAM = 0.4V)
- Soft-start period: 0.8 ms (Min) to 2.2 ms (Max)
- V IN under-voltage lockout threshold rising: 3.85 V (Min) to 4.25 V (Max)
Features:
- Wide 4.5V to 24V Operating Input Range
- 110m Ω /55m Ω Low RDS(ON) Internal Power MOSFETs
- 3A Load Current
- Fixed 500kHz Switching Frequency
- Over-Current Protection (OCP) and Hiccup
- Thermal Shutdown
Applications:
- Notebook Systems and I/O Power
- Flat Panel Television and Monitors
- Digital Set-Top Boxes
Package:
- TSOT23-8
Features
- Wide 4.5V to 24V Operating Input Range
- 110m Ω /55m Ω Low RDS(ON) Internal Power MOSFETs
- 3A Load Current
- Low Quiescent Current
- High-Efficiency Synchronous Mode Operation
- Fixed 500kHz Switching Frequency
- AAM Power Save Mode
- Internal Soft Start
- Over-Current Protection (OCP) and Hiccup
- Output Over-Voltage Protection (OVP)
- Thermal Shutdown
- Available in a TSOT23-8 Package
- Output Adjustable from 0.8V
Applications
- Notebook Systems and I/O Power
- Flat Panel Television and Monitors
- Digital Set-Top Boxes
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under quality assurance. 'MPS' and 'The Future of Analog IC Technology' are registered trademarks of Monolithic Power Systems, Inc.
Pin Configuration
| Pin # | Name | Description |
|---|---|---|
| 1 | AAM | Advanced asynchronous modulation. Connect AAM to a voltage supply through a resistor divider to force the MP2315S into non-synchronous mode under light-load conditions. Tie AAM to VCC or leave AAM floating to disable AAM mode and force the MP2315S into CCM. |
| 2 | IN | Supply voltage. The MP2315S operates with a 4.5V to 24V input rail. C1 is needed to decouple the input rail. Connect using a wide PCB trace. |
| 3 | SW | Switch output. Connect using a wide PCB trace. |
| 4 | GND | System ground. GND is the reference ground of the regulated output voltage. GND requires special consideration during PCB layout. Connect GND with copper traces and vias. |
| 5 | BST | Bootstrap. A capacitor and a resistor are required between SW and BST to form a floating supply across the high-side switch driver. |
| 6 | EN | Enable. Drive EN high to enable the MP2315S. |
| 7 | VCC | Internal bias supply, internal 5.1V LDO output. Decouple VCC with a 0.1 μ F - 0.22 μ F capacitor. The capacitance should be no more than 0.22 μ F. |
| 8 | FB | Feedback. Connect FB to the tap of an external resistor divider from the output to GND to set the output voltage. The frequency foldback comparator lowers the oscillator frequency when the FB voltage is below 400mV to prevent current-limit runaway during a short-circuit fault condition. |
Electrical Characteristics
VIN = 12V, TJ = -40°C to +125°C. (6) Typical value is tested at TJ = +25°C, unless otherwise noted.
| Parameter | Symbol | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Supply current (shutdown) | I IN | V EN = 0V, T J = 25°C | 1 | μ A | ||
| Supply current (quiescent) | I q | V EN = 2V, V FB = 0.85V, AAM = 0.4V | 120 | μ A | ||
| HS switch on resistance | HS RDS-ON | V BST-SW = 5V | 110 | m Ω | ||
| LS switch on resistance | LS RDS-ON | V CC = 5V | 55 | m Ω | ||
| Switch leakage | SW LKG | V EN = 0V, V SW = 12V, T J = 25°C | 1 | μ A | ||
| Current limit | I LIMIT | Duty cycle = 40% | 4.5 | 5.5 | 6.5 | A |
| Oscillator frequency | f SW | V FB = 750mV | 400 | 500 | 600 | kHz |
| Foldback frequency | f FB | V FB = 200mV | 0.5 | f SW | ||
| Maximum duty cycle | D MAX | V FB = 750mV | 90 | 95 | % | |
| Minimum on time (7) | T ON_MIN | 60 | ns | |||
| Feedback voltage | V FB | 783 | 791 | 800 | mV | |
| Feedback current | I FB | V FB = 820mV | 10 | 50 | nA | |
| EN rising threshold | V EN_RISING | 1.26 | 1.4 | 1.54 | V | |
| EN hysteresis | V EN_HYS | 150 | mV | |||
| EN input current | I EN | V EN = 2V | 1 | 2 | 3 | μ A |
| EN input current | I EN | V EN = 0 | 0 | 50 | nA | |
| EN turn-off delay | EN Td-off | 5 | 9 | 13 | μ s | |
| V IN under-voltage lockout threshold rising | INUV Vth | 3.85 | 4.05 | 4.25 | V | |
| V IN under-voltage lockout threshold hysteresis | INUV HYS | 600 | 750 | 900 | mV | |
| VCC regulator | V CC | 4.85 | 5.1 | 5.35 | V | |
| VCC load regulation | I CC = 5mA | 1.5 | % | |||
| Soft-start period | T SS | 10% to 90% | 0.8 | 1.5 | 2.2 | ms |
| Thermal shutdown (7) | T SD | 150 | °C | |||
| Thermal hysteresis (7) | T HYS | 20 | °C | |||
| AAM source current | I AAM | 6.7 | μ A | |||
| OVP rising threshold | OV H _ RISE | FB voltage | 115% | 120% | 125% | VREF |
| OVP falling threshold | OV L _ FALL | FB voltage | 104% | 109% | 114% | VREF |
| OVP delay (7) | OV DEY | 2 | μ s |
Absolute Maximum Ratings
- V SW .....-0.3V (-5V < 10ns) to +28V (30V < 10ns)
- V BST ......................................................V SW + 6V
- All other pins ...........................-0.3V to +5.5V (2)
- Continuous power dissipation (T A = +25°C) (3) ... ................................................................. 1.25W
- Junction temperature ................................150°C
- Lead temperature .....................................260°C
- Storage temperature.................. -65°C to 150°C
- Recommended Operating Conditions (4) Supply voltage (V ) ........................... 4.5 to 24V
- IN
- Output voltage (V OUT )..............0.8V to V IN * D MAX
- Operating junction temp (T J ). ... -40°C to +125°C
Thermal Resistance (5) θ JA θ JC
TSOT23-8…………………....…..100…..55...°C/W
Thermal Information
Thermal shutdown is implemented to prevent the chip from operating at exceedingly high temperatures. When the silicon die temperature is higher than 150°C, the entire chip shuts down. When the temperature is lower than its lower threshold, typically 130°C, the chip is enabled again.
Typical Application
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| MP2315S | Monolithic Power Systems (MPS) | — |
| MP2315SGJ | Monolithic Power Systems (MPS) | — |
| MP2315SGJ-Z | Monolithic Power Systems (MPS) | SOT-23-8 Thin, TSOT-23-8 |
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