LTC1983-3/LTC1983-5
1
1983fc
For more information www.linear.com/LTC1983-3
Typical applicaTion
FeaTures DescripTion
100mA Regulated
Charge-Pump Inverters
in ThinSOT
The LT C
®
1983-3 and LTC1983-5 are inverting charge
pump DC/DC converters that produce negative regulated
outputs. The parts require only three tiny external capaci
-
tors and can provide up to 100mA of output current. The
devices can operate in open loop mode (creating a –V
IN
supply) or regulated output mode depending on the input
supply voltage and the output current.
The LTC1983-3/LTC1983-5 have many useful features for
portable applications including very low quiescent current
(25µA typical) and a zero current shutdown mode pro
-
grammed through the SHDN pin.
The LTC1983-3/LTC1983-5 are over-temperature and
short-circuit protected. The parts are available in a 6-pin
low profile (1mm) ThinSOT package.
–3V at 100mA DC/DC Converter V
OUT
vs I
OUT
applicaTions
n
Fixed Output Voltages: –3V, –5V or Low Noise V
IN
to –V
IN
Inverted Output
n
±4% Output Voltage Accuracy
n
Low Quiescent Current: 25µA
n
100mA Output Current Capability
n
2.3V to 5.5V Operating Voltage Range
n
Internal 900kHz Oscillator
n
“Zero Current” Shutdown
n
Short-Circuit and Over-Temperature Protected
n
Low Profile (1mm) ThinSOT
TM
Package
n
–3V Generation in Single-Supply Systems
n
Portable Equipment
n
LCD Bias Supplies
n
GaAs FET Bias Supplies
V
IN
SHDN
C
+
V
OUT
GND
C
–
LTC1983-3
V
IN
3V TO 5.5V
V
OUT
= –3V
I
OUT
= UP TO 100mA
C
OUT
10µF
C
IN
10µF
C
F LY
1µF
OFF ON
C
F LY
: TAIYO YUDEN LMK212BJ105
C
IN
, C
OUT
: TAIYO YUDEN JMK316BJ106ML
1983-3 TA01
I
OUT
(mA)
0
V
OUT
(V)
–3.3
–3.2
–3.1
–3.0
–2.9
–2.8
–2.7
20 40 60 80
100
V
IN
= 5V
V
IN
= 3.3V
L, LT , LT C , LT M , Linear Technology, Burst Mode and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.