t6309a TM Technology Inc., t6309a Datasheet - Page 2

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

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PIN ARRANGEMENT
PIN DESCRIPTION
BLOCK DIAGRAM
TM Technology Inc. reserves the right
to change products or specifications without notice.
V
F B
SYMBOL
C E
GND
SW
I N
GND
OVP
SW
V
SOT23-6 (Top view)
CE
FB
FB
IN
a m p l i f i e r
CH
TE
e r r o r
m i n i m u m
o n e - s h o t
1
2
3
o f f - t i m e
+
-
r e f e r e n c e
v o l t a g e
Pin No.
1
2
3
4
5
6
6
5
4
OVP
V
CE
IN
Switch pin. Connect inductor/diode here. Minimize trace area at this
pin to reduce EMI.
Ground pin. Connect to local ground plane.
Feedback pin. Reference voltage is 400mV (T6309A-A). Optional
reference voltage is 1.19V (T6309A-B). Connect cathode of lowest
LED and current sense resistor here.
Chip enable pin. Tie CE pin to 1.5V or higher to enable device; 0.4V
or less to shutdown the device. Do not float this pin.
Overvoltage protection. Connect his pin to the output capacitor of
the converter.
Input supply pin. Must be locally bypassed.
l o c k o u t
v o l t a g e
u n d e r
c o n t r o l
l o g i c
Fig. 1
o v e r v o l t a g e
P. 2
p r o t e c t i o n
b u f f e r
d r i v e r
DESCRIPTION
c u r r e n t
l i m i t
+
1 . 1 9 V
-
Publication Date: MAY. 2007
S W
G N D
O V P
T6309A
Revision: A