Specification	TC105303ECTTR

Clock Sync	False
Control Features	Enable
Duty Cycle (Max) [Max]	100 %
Frequency - Switching	300 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Phases	1
Output Type	Transistor Driver
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Synchronous Rectifier	False
Topology	Buck
Voltage - Supply (Vcc/Vdd) [Max]	10 V
Voltage - Supply (Vcc/Vdd) [Min]	2.2 V

TC105303 Series

PFM/PWM Step-Down DC/DC Converter

Part	Supplier Device Package	Output Phases	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Number of Outputs	Function	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Configuration	Output Type	Frequency - Switching	Topology	Duty Cycle (Max) [Max]	Control Features	Mounting Type
Microchip Technology TC105303ECTTR	SOT-23-5	1	85 °C	-40 °C	SC-74A SOT-753	1	Step-Down	2.2 V	10 V	Positive	Transistor Driver	300 kHz	Buck	100 %	Enable	Surface Mount
Microchip Technology TC105333ECTTR	SOT-23-5	1	85 °C	-40 °C	SC-74A SOT-753	1	Step-Down	2.2 V	10 V	Positive	Transistor Driver	300 kHz	Buck	100 %	Enable	Surface Mount
Microchip Technology TC105503ECTTR	SOT-23-5	1	85 °C	-40 °C	SC-74A SOT-753	1	Step-Down	2.2 V	10 V	Positive	Transistor Driver	300 kHz	Buck	100 %	Enable	Surface Mount

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tape & Reel (TR)	3000	$ 2.59
Microchip Direct	T/R	1	$ 3.41
		25	$ 2.85
		100	$ 2.59
		1000	$ 2.15
		5000	$ 1.99
		10000	$ 1.85
Newark	Each (Supplied on Full Reel)	100	$ 2.67

Description

General part information

TC105303 Series

The TC105 is a step-down (Buck) switching controller that furnishes output currents of up to 1A (max) while delivering a typical efficiency of 92%. The TC105 normally operates in pulse width modulation mode (PWM), but automatically switches to pulse frequency modulation (PFM) at low output loads for greater efficiency. Oscillator frequency is 300 KHz, allowing use of small (22 µH) inductors. Supply current draw is only 102 µA (max), and is reduced to less than 0.5 µA when the SHDN input is brought low. Regulator operation is suspended during shutdown. The TC105 accepts a maximum input voltage of 10V. The TC105 is housed in a tiny 5-pin SOT-23A package, occupies minimum board space, and is ideal for a wide range of applications.

Documents

Technical documentation and resources

Datasheet

Power Management in Portable Applications: Understanding the Buck Switchmode Power Converter

Application Notes