LTC1928ES6-5 반도체 회로 부품 판매점
Doubler Charge Pump with Low Noise Linear Regulator in ThinSOT
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 Linear Technology |
LTC1928-5
Doubler Charge Pump with
Low Noise Linear Regulator
in ThinSOT
FEATURES
s Low Output Noise: 90µVRMS (100kHz BW)
s Fixed Output Voltage: 5V
s Input Voltage Range: 2.7V to 4.4V
s No Inductors Required
s Uses Small Ceramic Capacitors
s Output Current Up to 30mA
s 550kHz Switching Frequency
s Low Operating Current: 190µA
s Low Shutdown Current: 4µA
s Internal Thermal Shutdown and Current Limiting
s Low Profile (1mm) ThinSOTTM Package
U
APPLICATIO S
s VCO Power Supplies for Cellular Phones
s 2-Way Pagers
s Wireless PCMCIA Cards
s Portable Medical Instruments
s Low Power Data Acquisition
s Remote Transmitters
s White LED Drivers
s GaAs Switches
DESCRIPTIO
The LTC®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 < 8µA,
removes the load from VIN by disabling the regulator and
discharges VOUT to ground through a 200Ω switch.
The LTC1928-5 LDO regulator is stable with only 2µF 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.
TYPICAL APPLICATION
Output Noise (BW = 10Hz to 2.5MHz)
VIN
2.7V TO 4.4V
4.7µF
0.47µF
LTC1928-5
1 VIN
3
VOUT
5 CP
4
CPO
6 CN/SHDN GND 2
5V
VOUT
4.7µF
4.7µF
19285 F01
Figure 1. Low Noise 5V Power Supply
VOUT
200µV/DIV
CCPO = COUT = 4.7µF
IOUT = 10mA
VIN = 3V
VOUT = 5V
TA = 25°C
100µs/DIV
19285 TA01
1
LTC1928-5
ABSOLUTE AXI U RATI GS
(Note 1)
VIN to Ground ..............................................– 0.3V to 5V
VOUT Voltage ...........................................– 0.3V to 5.25V
CPO to Ground ........................................................ 10V
CN/SHDN to Ground ..................... – 0.3V to (VIN + 0.3V)
VOUT Short-Circuit Duration ............................. Indefinite
IOUT ......................................................................................... 40mA
Operating Temperature Range (Note 2) ...–40°C to 85°C
Maximum Junction Temperature ......................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VIN 1
GND 2
VOUT 3
6 CN/SHDN
5 CP
4 CPO
S6 PACKAGE
6-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 230°C/ W
ORDER PART
NUMBER
LTC1928ES6-5
S6 PART MARKING
LTKT
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 3V, CFLY = 0.47µF, COUT, CCPO, CIN = 4.7µF unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VIN Operating Voltage
IVIN Shutdown Current
IVIN Operating Current
Regulated Output Voltage
VOUT Temperature Coefficient
Charge Pump Oscillator Frequency
CPO Output Resistance
VOUT Dropout Voltage (Note 3)
VOUT Enable Time
VOUT Output Noise Voltage
VOUT Line Regulation
VOUT Load Regulation
VOUT Shutdown Resistance
CN/SHDN Input Threshold
CN/SHDN Input Current
SHDN = 0V (Note 5)
IOUT = 0mA, Burst ModeTM Operation
IOUT = 1mA
IOUT > 500µA, VIN = 2.7V to 4.4V
VIN = 2.7V, IOUT = 10mA
VIN = 4.4V, IOUT = 10mA
IOUT = 10mA, VOUT = 5V
RLOAD = 2k
IOUT = 10mA, 10Hz ≤ f ≤ 100kHz
IOUT = 10mA, 10Hz ≤ f ≤ 2.5MHz
VIN = 2.7V to 4.4V, IOUT = 0
IOUT = 1mA to 10mA
IOUT = 1mA to 30mA (Note 4)
CN/SHDN = 0V (Note 5)
VIN = 2.7V, Resistance Measured to Ground
VIN = 4.4V, Resistance Measured to Ground
VIN = 2.7V to 4.4V (Note 5)
CN/SHDN = 0V (Note 5)
Burst Mode is a trademark of Linear Technology Corporation.
q 2.7
4.4
q 48
q 190 330
q 4.9 5 5.1
± 50
q 480 550 620
q 17 30
q 14 24
q 100
0.6
90
800
q 4 20
q 2 10
4
q 160 400
q 100 300
q 0.15
0.5
1.6
q –1 –3 –6
V
µA
µA
V
ppm
kHz
Ω
Ω
mV
ms
µVRMS
µVP-P
mV
mV
mV
Ω
Ω
V
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1928ES6-5 is guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the – 40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Dropout voltage is the minimum input/output voltage required to
maintain regulation at the specified output current. In dropout the output
voltage will be equal to: VCPO – VDROPOUT (see Figure 2).
2
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LTC1928ES6-5 regulator
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
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LTC1928ES6-5
Doubler Charge Pump with Low Noise Linear Regulator in ThinSOT - Linear Technology
