t6309a TM Technology Inc., t6309a Datasheet - Page 7

• Manufacturer Part Number: t6309a
• Description: Micropower Step-up Dc/dc Converter
• Manufacturer: TM Technology Inc.

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T6309A
voltage exceeds the OVP threshold voltage,
the main switch is turned off. It remains off
until the output voltage falls below the OVP
threshold voltage. The step-up converter
continues normal operation as long as the
output voltage is under the OVP threshold.
Shutdown
The T6309A enters shutdown to reduce
quiescent current under 1uA when CE pin is
low . For normal operation, drive CE high.
During shutdown, the reference, all feedback
and control circuitry are off. The boost
converter’s output drops to one Schottky
diode voltage drop below the input voltage
and SW remains high impedance. The
capacitance and load at VOUT determine the
rate at which VOUT decays. The CE pin can
also be used as dimming control. More details
are in the dimming control section
.
Undervoltage Lockout
An undervoltage lockout (UVLO) circuit
prevents fault operation of the T6309A when
input voltage is under 1.75V (typ). The device
remains off as long as the input voltage is
under the UVLO threshold.
TM Technology Inc. reserves the right
P. 7
Publication Date: MAY. 2007
to change products or specifications without notice.
Revision: A