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LTC1928-5 Datasheet

  • LTC1928-5

  • Doubler Charge Pump with Low Noise Linear Regulator in ThinS...

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LTC1928-5
Doubler Charge Pump with
Low Noise Linear Regulator
in ThinSOT
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Low Output Noise: 90
碌
V
RMS
(100kHz BW)
Fixed Output Voltage: 5V
Input Voltage Range: 2.7V to 4.4V
No Inductors Required
Uses Small Ceramic Capacitors
Output Current Up to 30mA
550kHz Switching Frequency
Low Operating Current: 190碌A(chǔ)
Low Shutdown Current: 4碌A(chǔ)
Internal Thermal Shutdown and Current Limiting
Low Profile (1mm) ThinSOT
TM
Package
The LTC
廬
1928-5 is a doubler charge pump with an internal
low noise, low dropout (LDO) linear regulator. The part is
designed to provide a low noise boosted supply voltage for
powering noise sensitive devices such as high frequency
VCOs in wireless applications.
An internal charge pump converts a 2.7V to 4.4V input to
a boosted output, while the internal LDO regulator con-
verts the boosted voltage to a low noise regulated output.
The regulator is capable of supplying up to 30mA of output
current. Shutdown reduces the supply current to < 8碌A(chǔ),
removes the load from V
IN
by disabling the regulator and
discharges V
OUT
to ground through a 200鈩?switch.
The LTC1928-5 LDO regulator is stable with only 2碌F on
the output. Small ceramic capacitors can be used, reduc-
ing PC board area.
The LTC1928-5 is short-circuit and overtemperature pro-
tected. The part is 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
s
s
s
s
s
s
s
s
VCO Power Supplies for Cellular Phones
2-Way Pagers
Wireless PCMCIA Cards
Portable Medical Instruments
Low Power Data Acquisition
Remote Transmitters
White LED Drivers
GaAs Switches
TYPICAL APPLICATION
LTC1928-5
V
IN
2.7V TO 4.4V
4.7碌F
0.47碌F
1
5
6
V
IN
CP
V
OUT
CPO
3
4
2
4.7碌F
19285 F01
Output Noise (BW = 10Hz to 2.5MHz)
5V
V
OUT
4.7碌F
V
OUT
200碌V/DIV
CN/SHDN GND
Figure 1. Low Noise 5V Power Supply
C
CPO
= C
OUT
= 4.7碌F 100碌s/DIV
I
OUT
= 10mA
V
IN
= 3V
V
OUT
= 5V
T
A
= 25擄C
U
19285 TA01
U
U
1

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