DocumentationDatasheet
Reliability Data
LT Journal
cad_symbol
Features
- Low Noise Constant Frequency Operation
- 2.7V to 5.5V Input Voltage Range
- No Inductors
- Typical Efficiency 25% Higher Than LDOs
- Shutdown Disconnects Load from VIN
- Output Voltage: 1.8V ±4% or 1.5V ±4%
- Output Current: 250mA
- Low Operating Current: IIN = 180µA Typ
- Low Shutdown Current: IIN = 10µA Typ
- Oscillator Frequency: 1.5MHz
- Soft-Start Limits Inrush Current at Turn On
- Short-Circuit and Overtemperature Protected
- Available in an 8-Pin MSOP Package
Typical Application
Description
The LTC1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary. Typical efficiency is over 25% higher than that of a linear regulator.
A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (fOSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency,the part enters Burst Mode’ operation under light load conditions.
Low operating current (180µA with no load, 10µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make theLTC1911 ideally suited for space constrained battery powered applications. The part is short-circuit and over temperature protected, and is available in an 8-pin MSOP package.
MS-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1911EMS8-1.5#PBF | MSOP | 8 | E | $2.77 | $2.34 |
| LTC1911EMS8-1.5#TRPBF | MSOP | 8 | E | $2.40 | |
| LTC1911EMS8-1.8#PBF | MSOP | 8 | E | $2.77 | $2.34 |
| LTC1911EMS8-1.8#TRPBF | MSOP | 8 | E | $2.40 | |
| LTC1911EMS8-1.5 | MSOP | 8 | E | $5.54 | $4.68 |
| LTC1911EMS8-1.5#TR | MSOP | 8 | E | $4.80 | |
| LTC1911EMS8-1.8 | MSOP | 8 | E | $5.54 | $4.68 |
| LTC1911EMS8-1.8#TR | MSOP | 8 | E | $4.80 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC342A-A | LTC1911EMS8-1.8 | Low Noise, Constant Frequency Step-Down Charge Pump | Contact Factory | |
| DC342A-B | LTC1911EMS8-1.5 | Low Noise, Constant Frequency Step-Down Charge Pump | Contact Factory |