LTC1983-5_15 Datasheet, PDF (1/12 Pages) Linear Technology – 100mA Regulated Charge-Pump Inverters in ThinSOT

LTC1983-3/LTC1983-5
100mA Regulated
Charge-Pump Inverters
in ThinSOT
FEATURES
■ _{Fixed Output Voltages: –3V, –5V or Low Noise VIN}
to –V_IN Inverted Output
■ _{±4% Output Voltage Accuracy}
■ _{Low Quiesient Current: 25µA}
■ _{100mA Output Current Capability}
■ _{2.3V to 5.5V Operating Voltage Range}
■ _{Internal 900kHz Oscillator}
■ _{“Zero Current” Shutdown}
■ _{Short-Circuit and Over-Temperature Protected}
■ _{Low Profile (1mm) ThinSOT}^TM _Package
U
APPLICATIO S
■ _{–3V Generation in Single-Supply Systems}
■ _{Portable Equipment}
■ _{LCD Bias Supplies}
■ _{GaAs FET Bias Supplies}
DESCRIPTIO
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
–3V at 100mA DC/DC Converter
V_IN
3V TO 5.5V
C_IN
10µF
OFF ON
V_IN
V_OUT
LTC1983-3
SHDN GND
C⁺
C^–
V_OUT = –3V
I_OUT = UP TO 100mA
C_OUT
10µF
C_FLY
1µF
1983-3 TA01
C_FLY: TAIYO YUDEN LMK212BJ105
C_IN, C_OUT: TAIYO YUDEN JMK316BJ106ML
–3.3
–3.2
–3.1
–3.0
–2.9
–2.8
–2.7
0
V_OUT vs I_OUT
V_IN = 5V
V_IN = 3.3V
20
40
60
80
100
I_OUT (mA)
1983 TA02
1983fa
1