LM27951SD/NOPB
ActiveWHITE LED ADAPTIVE 1.5X/1X SWITCHED CAPACITOR CURRENT DRIVER WITH 2.8V-5.5V INPUT VOLTAGE RANGE
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LM27951SD/NOPB
ActiveWHITE LED ADAPTIVE 1.5X/1X SWITCHED CAPACITOR CURRENT DRIVER WITH 2.8V-5.5V INPUT VOLTAGE RANGE
Technical Specifications
Parameters and characteristics for this part
| Specification | LM27951SD/NOPB |
|---|---|
| Applications | Backlight |
| Current - Output / Channel | 30 mA |
| Dimming | PWM |
| Frequency | 750 kHz |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Outputs | 4 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Package / Case | 14-WFDFN Exposed Pad |
| Supplier Device Package | 14-WSON (4x3) |
| Topology | Switched Capacitor (Charge Pump) |
| Type | DC DC Regulator |
| Voltage - Output [Max] | 3.9 V |
| Voltage - Output [Min] | 2.5 V |
| Voltage - Supply (Max) | 5.5 V |
| Voltage - Supply (Min) [Min] | 2.8 V |
| Part | Topology | Applications | Voltage - Output [Max] | Voltage - Output [Min] | Package / Case | Voltage - Supply (Min) [Min] | Type | Number of Outputs | Supplier Device Package | Current - Output / Channel | Voltage - Supply (Max) | Mounting Type | Dimming | Operating Temperature [Max] | Operating Temperature [Min] | Frequency | Internal Switch(s) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Texas Instruments | Switched Capacitor (Charge Pump) | Backlight | 3.9 V | 2.5 V | 14-WFDFN Exposed Pad | 2.8 V | DC DC Regulator | 4 | 14-WSON (4x3) | 30 mA | 5.5 V | Surface Mount | PWM | 85 °C | -40 °C | 750 kHz | |
Texas Instruments | Switched Capacitor (Charge Pump) | Backlight | 3.9 V | 2.5 V | 14-WFDFN Exposed Pad | 2.8 V | DC DC Regulator | 4 | 14-WSON (4x3) | 30 mA | 5.5 V | Surface Mount | PWM | 85 °C | -40 °C | 750 kHz | |
Texas Instruments | Switched Capacitor (Charge Pump) | Backlight | 3.9 V | 2.5 V | 14-WFDFN Exposed Pad | 2.8 V | DC DC Regulator | 4 | 14-WSON (4x3) | 30 mA | 5.5 V | Surface Mount | PWM | 85 °C | -40 °C | 750 kHz | |
Texas Instruments | Switched Capacitor (Charge Pump) | Backlight | 3.9 V | 2.5 V | 14-WFDFN Exposed Pad | 2.8 V | DC DC Regulator | 4 | 14-WSON (4x3) | 30 mA | 5.5 V | Surface Mount | PWM | 85 °C | -40 °C | 750 kHz |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 1.85 | |
| 10 | $ 1.66 | |||
| 25 | $ 1.57 | |||
| 100 | $ 1.33 | |||
| 250 | $ 1.25 | |||
| 500 | $ 1.10 | |||
| Digi-Reel® | 1 | $ 1.85 | ||
| 10 | $ 1.66 | |||
| 25 | $ 1.57 | |||
| 100 | $ 1.33 | |||
| 250 | $ 1.25 | |||
| 500 | $ 1.10 | |||
| Tape & Reel (TR) | 1000 | $ 0.91 | ||
| 2000 | $ 0.85 | |||
| 5000 | $ 0.81 | |||
| 10000 | $ 0.78 | |||
| Texas Instruments | SMALL T&R | 1 | $ 1.39 | |
| 100 | $ 1.15 | |||
| 250 | $ 0.82 | |||
| 1000 | $ 0.62 | |||
Description
General part information
LM27951 Series
The LM27951 is a switched capacitor white-LED driver capable of driving up to four LEDs with 30 mA through each LED. Its four tightly regulated current sources ensure excellent LED current and brightness matching. LED drive current is programmed by an external sense resistor. The LM27951 operates over an input voltage range from 2.8 V to 5.5 V and requires only four low-cost ceramic capacitors.
The LM27951 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in a gain of 1. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage requirements.
The LM27951 uses constant frequency pre-regulation to minimize conducted noise on the input. It has a fixed 750-kHz switching frequency optimized for portable applications. The LM27951 consumes less than 1 µA of supply current when shut down.
Documents
Technical documentation and resources