Product Details
Key Features
Applications/Uses
VIN (V) (min) | 3 |
VIN (V) (max) | 5.5 |
VOUT1 (V) (min) | 1.1 |
VOUT1 (V) (max) | 5.5 |
IOUT1 (A) (max) | 2.7 |
Switch Type | Internal |
Preset VOUT (V) | 1.5 1.8 2.5 |
Output Adjust. Method | Preset Resistor |
Synchronous Switching? | Yes |
# DC-DC Outputs | 1 |
Switching Frequency (kHz) | 1000 |
Package/Pins | TQFN/28 |
Budgetary Price (See Notes) | 4.94 |
Simplified Block Diagram
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Parameters
VIN (V) (min) | 3 |
VIN (V) (max) | 5.5 |
VOUT1 (V) (min) | 1.1 |
VOUT1 (V) (max) | 5.5 |
IOUT1 (A) (max) | 2.7 |
Switch Type | Internal |
Preset VOUT (V) | 1.5 1.8 2.5 |
Output Adjust. Method | Preset Resistor |
Synchronous Switching? | Yes |
# DC-DC Outputs | 1 |
Switching Frequency (kHz) | 1000 |
Package/Pins | TQFN/28 |
Budgetary Price (See Notes) | 4.94 |
Key Features
- ±1% Output Accuracy
- Up to 1MHz Switching Frequency
- 95% Efficiency
- Internal pMOS/nMOS Switches
- 90mΩ/70mΩ On-Resistance at VIN = +4.5V
- 110mΩ/80mΩ On-Resistance at VIN = +3V
- Output Voltage
- +2.5V, +1.8V, or +1.5V Pin Selectable
- +1.1V to VIN Adjustable
- +3V to +5.5V Input Voltage Range
- 350µA Operating Supply Current
- < 1µA Shutdown Supply Current
- Programmable Constant-Off-Time Operation
- Idle Mode Operation at Light Loads
- Thermal Shutdown
- Adjustable Soft-Start Inrush Current Limiting
- 100% Duty Cycle During Low-Dropout Operation
- Output Short-Circuit Protection
- 28-Pin TQFN Package
Applications/Uses
- 5V or 3.3V to Low-Voltage Conversion
- Chipset Supplies
- CPU I/O Ring
- Notebook and Subnotebook Computers
Description
The MAX1843 uses a unique current-mode, constant-off-time, PWM control scheme, which includes Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, allowing the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. The MAX1843 features an adjustable soft-start to limit surge currents during startup, a 100% duty-cycle mode for low dropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1µA. The MAX1843 is available in a 28-pin TQFN package with an exposed backside pad.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .