1 Features

1• 3-V to 18-V Input voltage range

• 38-V Open LED protection

• 200-mV Reference voltage with 2% accuracy

• 1.2-A Switch FET with 1.2-MHz switching

frequency

• Flexible one-wire digital and PWM brightness

control

• Built-in soft start

• Up to 90% efficiency

• 2-mm × 2-mm × 0.8-mm 6-Pin WSON package

with thermal pad, and SOT-23 package

2 Applications

• High-brightness LED lighting

• White LED backlighting for media form factor

display

• Handheld data terminals (EPOS)

• Thermostat display

• Human machine interface (HMI)

• Video surveillance camera

• Exit signs

• HMI and control panels

• Industrial PCs

• IR LED driver

• Refrigerator

• Ovens

3 Description

With a 40-V rated integrated switch FET, the

TPS61165 device is a boost converter that drives

LEDs in series. The boost converter runs at a

1.2-MHz fixed switching frequency with 1.2-A switch

current limit, allowing the use of a high-brightness

LED in general lighting.

The default white LED current is set with the external

sensor resistor Rset, and the feedback voltage is

regulated to 200 mV, as shown in the Typical

Application drawing below. During the operation, the

LED current can be controlled using the one-wire

digital interface (EasyScale™ protocol) through the

CTRL pin. Alternatively, a pulse-width-modulation

(PWM) signal can be applied to the CTRL pin through

which the duty cycle determines the feedback

reference voltage. In either digital or PWM mode, the

TPS61165 device does not burst the LED current;

therefore, it does not generate audible noises on the

output capacitor. For maximum protection, the device

features integrated open-LED protection that disables

the TPS61165 device to prevent the output from

exceeding its absolute maximum voltage ratings

during open LED conditions.