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.