Linear Technology DC239 Demo Manual

U
DESCRIPTIO
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 (40µA typ) and minimal external compo-
nent area make this power supply ideal for space and
W U
PERFOR A CE SU
PARAMETER
V Operating Voltage
IN
Minimum V Start-Up Voltage
IN
V
OUT
V Operating Current
IN
V Shutdown Current
IN
Output Ripple
Efficiency
TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO
Output Voltage vs Input Voltage
3.5
T = 25°C
A
3.4
I
OUT
3.3
I
OUT
3.2
I
OUT
3.1
3.0
0.8 1.0 1.2
INPUT VOLTAGE (V)
W W
ARY
Operating Temperature Range 0°C to 70°C
CONDITIONS
100kΩ V
OUT
≤ 10mA, 1V ≤ V
I
OUT
= 0mA, 0.9V ≤ V
I
OUT
/SHDN = 0V, 0.9V ≤ V
–
C1
I = 10mA, V
OUT
V = 1V, I
IN
W U
= 1mA
= 10mA
= 15mA
1.4 1.6 1.8
1502-3.3 TA02
DEMO MANUAL DC239
Single Cell to 3.3V Regulated
Charge Pump DC/DC Converter
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
5µA (typ) and disconnects V
this circuit are available. Call the LTC factory.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Load
≤ 1.8V
IN
≤ 1.8V
IN
≤ 1.8V
IN
= 1.25V
IN
= 10mA
OUT
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NO-DESIGN SWITCHER
LTC1502-3.3
from V . Gerber files for
OUT IN
MIN TYP MAX
0.9 1.8
0.75 0.9
3.17 3.3 3.43
40 90
5 15
50
77
Component Side
UNITS
V
V
V
µA
µA
mV
P-P
%
1