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LTC1928ES6-5#TRPBF

P1-P3P4-P6P7-P9P10-P10
LTC1928-5
1
19285fa
For more information www.linear.com/LTC 1928-5
Figure 1. Low Noise 5V Power Supply
Output Noise (BW = 10Hz to 2.5MHz)
TYPICAL APPLICATION
FEATURES DESCRIPTION
Doubler Charge Pump with
Low Noise Linear Regulator
in ThinSOT
The LT C
®
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 converts
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 V
IN
by disabling the regulator and
discharges V
OUT
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.
APPLICATIONS
n
Low Output Noise: 90µV
RMS
(100kHz BW)
n
Fixed Output Voltage: 5V
n
Input Voltage Range: 2.7V to 4.4V
n
No Inductors Required
n
Uses Small Ceramic Capacitors
n
Output Current Up to 30mA
n
550kHz Switching Frequency
n
Low Operating Current: 190µA
n
Low Shutdown Current: 4µA
n
Internal Thermal Shutdown and Current Limiting
n
Low Profile (1mm) ThinSOT™ Package
n
VCO Power Supplies for Cellular Phones
n
2-Way Pagers
n
Wireless PCMCIA Cards
n
Portable Medical Instruments
n
Low Power Data Acquisition
n
Remote Transmitters
n
White LED Drivers
n
GaAs Switches
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
ThinSOT and Burst Mode are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
1
5
6
3
4
2
V
OUT
CPO
GND
V
IN
2.7V TO 4.4V
V
IN
CP
CN/SHDN
5V
4.7µF
0.47µF
4.7µF
4.7µF
19285 F01
V
OUT
LTC1928-5
V
OUT
200µV/DIV
19285 TA01
C
CPO
= C
OUT
= 4.7µF
I
OUT
= 10mA
V
IN
= 3V
V
OUT
= 5A
T
A
= 25°C
100µs/DIV
LTC1928-5
2
19285fa
For more information www.linear.com/LTC 1928-5
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN
to Ground ............................................... –0.3V to 5V
V
OUT
Voltage ........................................... –0.3V to 5.25V
CPO to Ground ..........................................................10V
CN/SHDN to Ground ..................... –0.3V to (V
IN
+ 0.3V)
V
OUT
Short-Circuit Duration ............................. Indefinite
I
OUT
........................................................................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
(Note 1)
1
2
3
V
IN
GND
V
OUT
6
5
4
CN/
SHDN
CP
CPO
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 125°C, θ
JA
= 230°C/W
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3V, C
F LY
= 0.47µF, C
OUT
, C
CPO
, C
IN
= 4.7µF unless otherwise
specified.
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1928ES6-5#PBF LTC1928ES6-5#TRPBF LTKT 6-Lead Plastic SOT-23 –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage
l
2.7 4.4 V
I
VIN
Shutdown Current SHDN = 0V (Note 5)
l
4 8 µA
I
VIN
Operating Current I
OUT
= 0mA, Burst Mode™ Operation
l
190 330 µA
Regulated Output Voltage I
OUT
= 1mA
l
4.9 5 5.1 V
V
OUT
Temperature Coefficient ±50 ppm
Charge Pump Oscillator Frequency I
OUT
> 500µA, V
IN
= 2.7V to 4.4V
l
480 550 620 kHz
CPO Output Resistance V
IN
= 2.7V, I
OUT
= 10mA
V
IN
= 4.4V, I
OUT
= 10mA
l
l
17
14
30
24
Ω
Ω
V
OUT
Dropout Voltage (Note 3) I
OUT
= 10mA, V
OUT
= 5V
l
100 mV
V
OUT
Enable Time R
LOAD
= 2k 0.6 ms
V
OUT
Output Noise Voltage I
OUT
= 10mA, 10Hz ≤ f ≤ 100kHz
I
OUT
= 10mA, 10Hz ≤ f ≤ 2.5MHz
90
800
µV
RMS
µV
P-P
V
OUT
Line Regulation V
IN
= 2.7V to 4.4V, I
OUT
= 0
l
4 20 mV
V
OUT
Load Regulation I
OUT
= 1mA to 10mA
I
OUT
= 1mA to 30mA (Note 4)
l
2
4
10 mV
mV
V
OUT
Shutdown Resistance CN/SHDN = 0V (Note 5)
V
IN
= 2.7V, Resistance Measured to Ground
V
IN
= 4.4V, Resistance Measured to Ground
l
l
160
100
400
300
Ω
Ω
LTC1928-5
3
19285fa
For more information www.linear.com/LTC 1928-5
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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: V
CPO
– V
DROPOUT
(see Figure 2).
CN/SHDN Input Threshold V
IN
= 2.7V to 4.4V (Note 5)
l
0.15 0.5 1.6 V
CN/SHDN Input Current CN/SHDN = 0V (Note 5)
l
–1 –3 –6 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3V, C
F LY
= 0.47µF, C
OUT
, C
CPO
, C
IN
= 4.7µF unless otherwise
specified.
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown to Enable Timing
(Figure 5)
Enable to Shutdown Timing
(Figure 5) V
OUT
Voltage vs Temperature
CPO Output Resistance vs V
IN
Min and Max V
CPO
vs V
IN
V
OUT
Transient Response
V
IN
(V)
R
CPO
(Ω)
35
30
25
20
15
10
5
2.5 3.0 3.5
19285 G01
4.0
4.5
T
A
= 25°C
C
FLY
= 0.47µF
I
OUT
= 10mA
200s/DIV
SHDN (V)V
OUT
(V)
2
0
5
4
3
2
1
0
19285 G04
T
A
= 25°C
V
IN
= 3V
V
OUT
= 5V
I
OUT
= 10mA
C
OUT
= C
CPO
= 4.7µF
V
IN
(V)
V
CPO
(V)
9
8
7
6
5
4
3
2.5 3.0 3.5
19285 G02
4.0
4.5
(A)
(A) THE MAXIMUM GENERATED NO LOAD
CPO VOLTAGE
(B) THE MINIMUM ALLOWABLE CPO VOLTAGE,
AT FULL LOAD, TO ENSURE THAT THE LDO
IS NOT DISABLED
(B)
V
CPO
= 1.45(V
IN
)
V
CPO
= 2(V
IN
)
T
A
= 25°C
1ms/DIV
OUT
2
0
5
4
3
2
1
0
NO LOAD
T
A
= 25°C
V
IN
= 3V
V
OUT
= 5V
C
OUT
= 4.7µF
TIME (µs)
0 50
∆V
OUT
(mV)I
OUT
(mA)
100 200150
250
300
19285 G03
10
5
0
–5
–10
15
10
5
0
T
A
= 25°C
V
IN
= 3V
V
OUT
= 5V
C
OUT
= 4.7µF
TEMPERATURE (°C)
–50
5.040
5.030
5.020
5.010
5.000
4.990
4.980
25 75
19285 G06
–25 0
50 100
125
V
OUT
VOLTAGE (V)
V
IN
= 3V
I
OUT
= 10mA
P1-P3P4-P6P7-P9P10-P10

LTC1928ES6-5#TRPBF

Mfr. #:
Buy LTC1928ES6-5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Doubler Ch Pump w/ L N Lin Reg in SOT-23
Lifecycle:
New from this manufacturer.
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