1
DEMO MANUAL DC239
NO-DESIGN SWITCHER
LTC1502-3.3
Single Cell to 3.3V Regulated
Charge Pump DC/DC Converter
Demonstration Circuit DC239 is a quadrupler charge pump
DC/DC converter that produces a regulated 3.3V output
from a single alkaline cell input. The circuit requires only
five small external capacitors and no inductors. Low
supply current (40
µ
A typ) and minimal external compo-
nent area make this power supply ideal for space and
power conscious single-cell applications. The maximum
output load is 10mA for input voltages greater than or
equal to 1V. A jumper is available to put the circuit into
shutdown mode, which reduces input quiescent current to
5
µ
A (typ) and disconnects V
OUT
from V
IN
.
Gerber files for
this circuit are available. Call the LTC factory.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Operating Voltage
0.9
1.8
V
Minimum V
IN
Start-Up Voltage
100k
Ω
V
OUT
Load
0.75
0.9
V
V
OUT
I
OUT
≤
10mA, 1V
≤
V
IN
≤
1.8V
3.17
3.3
3.43
V
V
IN
Operating Current
I
OUT
= 0mA, 0.9V
≤
V
IN
≤
1.8V
40
90
µ
A
V
IN
Shutdown Current
C1
–
/SHDN = 0V, 0.9V
≤
V
IN
≤
1.8V
5
15
µ
A
Output Ripple
I
OUT
= 10mA, V
IN
= 1.25V
50
mV
P-P
Efficiency
V
IN
= 1V, I
OUT
= 10mA
77
%
Operating Temperature Range 0
°
C to 70
°
C
Output Voltage vs Input Voltage
INPUT VOLTAGE (V)
0.8
OUTPUT VOLTAGE (V)
3.3
3.4
3.5
1.6
1502-3.3 TA02
3.2
3.1
3.0
1.0
1.2
1.4
1.8
I
OUT
= 1mA
I
OUT
= 10mA
I
OUT
= 15mA
T
A
= 25
°
C
Component Side
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
U
PERFOR A CE SU ARY
U
W
WW
TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO
U
U
W
