LTC1983-3/LTC1983-5
100mA Regulated
Charge-Pump Inverters
in ThinSOT
FEATURES
s
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DESCRIPTIO
Fixed Output Voltages: –3V, –5V or Low Noise V
IN
to –V
IN
Inverted Output
±4%
Output Voltage Accuracy
Low Quiesient Current: 25µA
100mA Output Current Capability
3V to 5.5V Operating Voltage Range (LTC1983-3)
2.3V to 5.5V Operating Voltage Range (LTC1983-5)
Internal 900kHz Oscillator
“Zero Current” Shutdown
Short-Circuit and Over-Temperature Protected
Low Profile (1mm) ThinSOT
TM
Package
The LTC
®
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
APPLICATIO S
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–3V Generation in Single-Supply Systems
Portable Equipment
LCD Bias Supplies
GaAs FET Bias Supplies
TYPICAL APPLICATIO
–3V at 100mA DC/DC Converter
V
IN
3V TO 5.5V
C
IN
10µF
OFF ON
V
IN
V
OUT
V
OUT
= –3V
I
OUT
= UP TO 100mA
C
OUT
10µF
V
OUT
(V)
–3.3
–3.2
–3.1
–3.0
–2.9
LTC1983-3
SHDN
C
+
GND
C
–
1983-3 TA01
C
FLY
1µF
C
FLY
: TAIYO YUDEN LMK212BJ105
C
IN
, C
OUT
: TAIYO YUDEN JMK316BJ106ML
–2.8
–2.7
0
20
U
V
OUT
vs I
OUT
V
IN
= 5V
V
IN
= 3.3V
40
60
I
OUT
(mA)
80
100
1983 TA02
U
U
sn1983 1983fs
1
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
