Datasheet

1
LTC1046
1046fb
“Inductorless”
5V to –5V Converter
Generating –5V from 5V
Output Voltage vs Load Current for V
+
= 5V
The LTC
®
1046 is a 50mA monolithic CMOS switched
capacitor voltage converter. It plugs in for the ICL7660/
LTC1044 in 5V applications where more output current is
needed. The device is optimized to provide high current
capability for input voltages of 6V or less. It trades off
operating voltage to get higher output current. The
LTC1046 provides several voltage conversion functions:
the input voltage can be inverted (V
OUT
= –V
IN
), divided
(V
OUT
= V
IN/
2) or multiplied (V
OUT
= ±nV
IN
).
Designed to be pin-for-pin and functionally compatible
with the ICL7660 and LTC1044, the LTC1046 provides 2.5
times the output drive capability.
■
50mA Output Current
■
Plug-In Compatible with ICL7660/LTC1044
■
R
OUT
= 35Ω Maximum
■
300µA Maximum No Load Supply Current at 5V
■
Boost Pin (Pin 1) for Higher Switching Frequency
■
97% Minimum Open-Circuit Voltage Conversion
Efficiency
■
95% Minimum Power Conversion Efficiency
■
Wide Operating Supply Voltage Range: 1.5V to 6V
■
Easy to Use
■
Low Cost
■
Conversion of 5V to ±5V Supplies
■
Precise Voltage Division, V
OUT
= V
IN
/2
■
Supply Splitter, V
OUT
= ±V
S
/2
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
1
2
3
4
8
7
6
5
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
LTC1046
10µF
10µF
1046 TA01
5V INPUT
–5V OUTPUT
+
+
LOAD CURRENT, I
L
(mA)
0
0
OUTPUT VOLTAGE (V)
–1
–2
–3
–4
–5
10 20 30 40
1046 TA02
50
ICL7660/LTC1044,
R
OUT
= 55Ω
T
A
= 25°C
LTC1046,
R
OUT
= 27Ω