LTC1516 Linear Technology, LTC1516 Datasheet - Page 7

• Manufacturer Part Number: LTC1516
• Description: Micropower/ Regulated 5V Charge Pump DC/DC Converter
• Manufacturer: Linear Technology

APPLICATIONS
Paralleling Devices
Two or more LTC1516’s may be connected in parallel to
provide higher output currents. The V
SHDN pins may be tied together, but the C1 and C2 pins
must be kept separate (see Figure 5). Separate C
C
and ripple if the paralleled devices cannot be kept close
together. Otherwise, single C
be used with each being 2 (or 3 if three parts are
paralleled, etc.) in value.
V
OUT
IN
TO 5V
= 2V
capacitors may be required to reduce output noise
+
22 F
Figure 5. Paralleling Devices
+
U
22 F
V
I
I
OUT
OUT
OUT
INFORMATION
= 0mA TO 40mA, V
= 0mA TO 100mA, V
= 5V 4%
1
2
3
4
1
2
3
4
U
C1
V
V
C2
C1
V
V
C2
IN
OUT
IN
OUT
IN
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
+
+
+
+
and C
LTC1516
LTC1516
0.22 F
0.22 F
0.22 F
0.22 F
W
IN
OUT
SHDN
SHDN
IN
IN
GND
GND
C2
C2
C1
C1
2V
, V
3V
–
–
–
–
capacitors may
8
7
6
5
8
7
6
5
OUT
, GND and
U
1516 • F05
IN
ON/OFF
and
General Layout Considerations
Due to the high switching frequency and high transient
currents produced by the LTC1516, careful board layout is
a must. A clean board layout using a ground plane and
short connections to all capacitors will improve perfor-
mance and ensure proper regulation under all conditions
(refer to Figure 6).
Figure 6. Suggested Component Placement for LTC1516
V
OUT
V
IN
C
OUT
C
IN
+
+
1
2
3
4
LTC1516
C1
C2
8
7
6
5
SHDN
1516 • F06
LTC1516
GND
7