S-8337AAIA-T8T1G

Voltage - Supply (Vcc/Vdd):	1.8 V ~ 6 V
Supplier Device Package:	8-TSSOP
Package / Case:	8-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	89%
Frequency - Switching:	257.4kHz ~ 1.134MHz
Series:	--
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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S-8337AAIA-T8T1G, is a DC/DC converter control IC of the Seiko Instruments group designed to make a current controlled buck/boost converter. Its output voltage is scaled to the output inductor current, or these can be externally trimmed. This IC is compliant with IEC60950-1 (2002) safety standards and integrated over current protection, error amplifiers, ramp generator and bias circuit.

Features

The S-8337AAIA-T8T1G provides a variety of features and benefits, including:- Built-in over-current protection- Internal 2-channel current sensing (4mA - 73mA)- Ramp generator for soft-start- Low shutdown current consumption- Low quiescent current consumption (1uA)

Applications

The S-8337AAIA-T8T1G IC is suitable for use in a variety of applications, including:- Portable recorders- Digital cameras- Battery-powered devices- Mobile phones- MP3 players

Working Principle

The S-8337AAIA-T8T1G is a current controlled DC/DC Buck/Boost converter IC that utilizes a buck mode of operation when the output voltage is lower than the input voltage and a boost mode when the output voltage is higher than the input voltage. It has an integrated ramp generator that allows the output voltage to ramp up linearly after a pre-set number of clock cycles, providing soft-start and output voltage protection.The IC uses a current sensing technique to monitor the output inductor current and switches rapidly off and on to regulate the output current. This current sensing technique provides accuracy and reliability, as well as overcurrent protection. The current sensing range is 4mA to 73mA and the ISP range is 3.6V to 5.4V.The IC uses an error amplifier to control the output voltage. This error amplifier compares the output voltage to a reference voltage and generates an error voltage, which is then used to adjust the output voltage. A ramp generator is also integrated for soft-start and to prevent overshoot and regulate the output voltage more accurately.The S-8337AAIA-T8T1G IC is compliant with IEC60950-1 (2002) safety standards and includes a bias circuit for low shutdown current consumption. It operates on a supply voltage of 2V - 6V and has a quiescent current consumption of 1uA.

Conclusion

The S-8337AAIA-T8T1G DC/DC buck-boost Control IC is an ideal option for a wide range of applications, including portable recorders, digital cameras, battery-powered devices, mobile phones, and MP3 players. Its integrated over-current protection, 2-channel current sensing, ramp generator and bias circuit provide high accuracy and reliability. Its low quiescent current consumption and low shutdown current make it a suitable choice in power-sensitive applications. This IC is compliant with IEC60950-1 (2002) safety standards and provides a cost-effective solution for powering battery-powered devices.

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