Texas Instruments LM3501
The LM3501 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. With fully integrated synchronous switching (no external schottky diode required) and a low feedback voltage (515 mV), power efficiency of the LM3501 circuit has been optimized for lighting applications in wireless phones and other portable products (single cell Li-Ion or 3-cell NiMH battery supplies). The LM3501 operates with a fixed 1 MHz switching frequency.| Part No. | LM3501 |
|---|---|
| Datasheet | LM3501 Download |
| Manufacturer |  Texas Instruments |
| Description | Synchronous Step-up DC/DC Converter |
| Buy | Stock & Price |
APPLICATIONS
Check for Samples: LM3501FEATURES
1●2 Synchronous Rectification, High Efficiency and no External Schottky Diode required
● Uses Small Surface Mount Components
● Can Drive 2-5 White LEDs in Series (May Function with More Low VF LEDs)
● 2.7V to 7V Input Range
● True Shutdown Isolation, no LED Leakage Current
● DC Voltage LED Current Control
● Input Undervoltage Lockout
● Internal Output Over-Voltage Protection (OVP) Circuitry, with no External Zener Diode Required LM3501-16: 15.5V OVP; LM3501-21: 20.5V OVP.
● Requires Only a Small 16V (LM3501-16) or 25V (LM3501-21) Ceramic Capacitor at the Input and Output
● Thermal Shutdown
● 0.1µA shutdown Current
● Small 8-Bump Thin DSBGA Package
APPLICATIONS
● LCD Bias Supplies● White LED Back-Lighting
● Handheld Devices
● Digital Cameras
● Portable
APPLICATIONS
DESCRIPTION
When used with ceramic input and output capacitors, the LM3501 provides a small, low-noise, low-cost solution. Typical Application Circuit VIN 2.7V - 5.5V Voltage Control CIN 1PF Ceramic >1.1V <0.3V L 22 PH B1 VIN C2 VSW A3 CNTRL LM3501-16 VOUT C1 A2 SHDN FB B3 AGND GND A1 C3 COUT 1PF Ceramic R2 24: Figure 1.
