LTC1928ES6-5#TRMPBF [Linear]
LTC1928-5 - Doubler Charge Pump with Low Noise Linear Regulator in SOT-23; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C;
| 型号： | LTC1928ES6-5#TRMPBF |
| 厂家： | 
Linear |
| 描述： | LTC1928-5 - Doubler Charge Pump with Low Noise Linear Regulator in SOT-23; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C 光电二极管 |
| 文件： | 总10页 (文件大小：304K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1928-5
Doubler Charge Pump with
Low Noise Linear Regulator
in ThinSOT
FEATURES
DESCRIPTION
The LTC®1928-5 isa doublerchargepump withaninternal
low noise, low dropout (LDO) linear regulator. The part is
designedtoprovidealownoiseboostedsupplyvoltagefor
powering noise sensitive devices such as high frequency
VCOs in wireless applications.
n
Low Output Noise: 90µV
Fixed Output Voltage: 5V
(100kHz BW)
RMS
n
n
n
n
n
n
n
n
n
n
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: 190µA
Low Shutdown Current: 4µA
Internal Thermal Shutdown and Current Limiting
Low Profile (1mm) ThinSOT™ Package
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 by disabling the regulator and
IN
discharges V
to ground through a 200Ω switch.
OUT
APPLICATIONS
The LTC1928-5 LDO regulator is stable with only 2µF on
the output. Small ceramic capacitors can be used, reduc-
ing PC board area.
n
VCO Power Supplies for Cellular Phones
n
2-Way Pagers
n
Wireless PCMCIA Cards
The LTC1928-5 is short-circuit and overtemperature pro-
tected. The part is available in a 6-pin low profile (1mm)
ThinSOT package.
L, LT, LTC, LTM, 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.
n
Portable Medical Instruments
n
Low Power Data Acquisition
n
Remote Transmitters
n
White LED Drivers
n
GaAs Switches
TYPICAL APPLICATION
Output Noise (BW = 10Hz to 2.5MHz)
LTC1928-5
5V
3
4
2
V
1
5
6
IN
V
V
V
OUT
IN
OUT
2.7V TO 4.4V
V
4.7µF
OUT
4.7µF
CP
CPO
GND
200µV/DIV
4.7µF
0.47µF
CN/SHDN
19285 F01
Figure 1. Low Noise 5V Power Supply
19285 TA01
C
= C
= 10mA
= 3V
= 5A
= 25°C
= 4.7µF 100µs/DIV
OUT
CPO
OUT
IN
I
V
V
OUT
T
A
19285fa
1
For more information www.linear.com/LTC 1928-5
LTC1928-5
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(Note 1)
V to Ground............................................... –0.3V to 5V
IN
OUT
V
Voltage........................................... –0.3V to 5.25V
TOP VIEW
CPO to Ground..........................................................10V
CN/SHDN to Ground ..................... –0.3V to (V + 0.3V)
V
1
2
3
6
5
4
CN/SHDN
CP
IN
IN
GND
V
Short-Circuit Duration............................. Indefinite
V
CPO
OUT
OUT
I
........................................................................40mA
OUT
S6 PACKAGE
6-LEAD PLASTIC SOT-23
= 125°C, θ = 230°C/W
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
T
JMAX
JA
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 85°C
LTC1928ES6-5#PBF
LTC1928ES6-5#TRPBF
LTKT
6-Lead Plastic SOT-23
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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, CFLY = 0.47µF, COUT, CCPO, CIN = 4.7µF unless otherwise
specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
4.4
8
UNITS
V
l
l
l
l
V
Operating Voltage
Shutdown Current
Operating Current
2.7
IN
I
I
SHDN = 0V (Note 5)
4
190
5
µA
VIN
VIN
I
I
= 0mA, Burst Mode™ Operation
= 1mA
330
5.1
µA
OUT
OUT
Regulated Output Voltage
Temperature Coefficient
4.9
V
V
50
ppm
kHz
OUT
l
Charge Pump Oscillator Frequency
CPO Output Resistance
I
> 500µA, V = 2.7V to 4.4V
480
550
620
OUT
IN
l
l
V
V
= 2.7V, I
= 4.4V, I
= 10mA
= 10mA
17
14
30
24
Ω
Ω
IN
IN
OUT
OUT
l
V
V
V
Dropout Voltage (Note 3)
Enable Time
I
= 10mA, V = 5V
OUT
100
mV
ms
OUT
OUT
OUT
OUT
R
= 2k
0.6
LOAD
Output Noise Voltage
I
I
= 10mA, 10Hz ≤ f ≤ 100kHz
= 10mA, 10Hz ≤ f ≤ 2.5MHz
90
800
µV
RMS
µV
P-P
OUT
OUT
l
l
V
V
Line Regulation
Load Regulation
V
= 2.7V to 4.4V, I = 0
OUT
4
20
10
mV
OUT
IN
I
I
= 1mA to 10mA
= 1mA to 30mA (Note 4)
2
4
mV
mV
OUT
OUT
OUT
V
Shutdown Resistance
CN/SHDN = 0V (Note 5)
OUT
l
l
V
V
= 2.7V, Resistance Measured to Ground
= 4.4V, Resistance Measured to Ground
160
100
400
300
Ω
Ω
IN
IN
19285fa
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For more information www.linear.com/LTC 1928-5
LTC1928-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, CFLY = 0.47µF, COUT, CCPO, CIN = 4.7µF unless otherwise
specified.
l
CN/SHDN Input Threshold
CN/SHDN Input Current
V
= 2.7V to 4.4V (Note 5)
0.15
–1
0.5
–3
1.6
–6
V
IN
l
CN/SHDN = 0V (Note 5)
µA
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.
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
Note 2: The LTC1928ES6-5 is guaranteed to meet performance
voltage will be equal to: V
– V
(see Figure 2).
CPO
DROPOUT
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
TYPICAL PERFORMANCE CHARACTERISTICS
CPO Output Resistance vs VIN
Min and Max VCPO vs VIN
VOUT Transient Response
9
8
7
6
5
4
3
35
30
25
20
15
10
5
10
5
T
= 25°C
T
= 25°C
A
A
C
I
= 0.47µF
FLY
= 10mA
OUT
V
= 2(V
(A)
)
IN
CPO
0
T
= 25°C
= 3V
A
IN
V
V
C
–5
–10
15
10
5
= 5V
OUT
OUT
(B)
= 4.7µF
V
= 1.45(V )
IN
CPO
0
2.5
3.0
3.5
(V)
4.0
4.5
250
0
50
100
150
200
300
2.5
3.0
3.5
(V)
4.0
4.5
V
TIME (µs)
V
IN
IN
19285 G03
19285 G01
(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
19285 G02
Shutdown to Enable Timing
(Figure 5)
Enable to Shutdown Timing
(Figure 5)
VOUT Voltage vs Temperature
5.040
5.030
5.020
5.010
5.000
4.990
4.980
V
OUT
= 3V
IN
2
0
5
4
3
2
1
0
2
I
= 10mA
0
5
4
3
2
1
0
NO LOAD
T
= 25°C
= 3V
A
IN
T
= 25°C
= 3V
V
V
I
A
IN
V
V
C
= 5V
OUT
= 5V
= 10mA
= C
OUT
OUT
OUT
= 4.7µF
C
= 4.7µF
OUT
CPO
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
200s/DIV
1ms/DIV
19285 G04
19285 G05
19285 G06
19285fa
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For more information www.linear.com/LTC 1928-5
LTC1928-5
TYPICAL PERFORMANCE CHARACTERISTICS
Operating Current vs VIN
(No Load)
Efficiency vs Supply Voltage
Output Voltage vs Output Current
260
240
220
200
180
160
140
120
100
4.901
4.900
4.989
4.988
4.987
4.986
4.985
4.984
4.983
4.982
100
90
T
V
C
= 25°C
= 3V
FLY
T
= 25°C
T
I
= 25°C
A
A
IN
A
= 15mA
OUT
= 0.47µF
C
= 0.47µF
FLY
80
70
60
50
40
20
OUTPUT CURRENT (mA)
0
5
10 15
25 30 35 40
2.5
3.0
3.5
(V)
4.0
4.5
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
SUPPLY VOLTAGE (V)
V
IN
19285 G07
19285 G09
19285 G08
PIN FUNCTIONS
V
(Pin 1): Input Voltage, 2.7V to 4.4V. V should be
CP (Pin 5): Flying Capacitor Positive Input.
IN
IN
bypassedwitha≥2µFlowESRcapacitorasclosetothepin
aspossibleforbestperformance.Aminimumcapacitance
value of 0.1µF is required.
CN/SHDN (Pin 6): Flying Capacitor Negative Input and
SHDN. When this pin is pulled to ground through a 100Ω
resistor, the part will go into shutdown within approxi-
mately 30µs.
GND (Pin 2): System Ground.
V
(Pin 3): Low Noise Regulated Output Voltage. V
OUT
OUT
should be bypassed with a ≥2µF low ESR capacitor as
close to the pin as possible for best performance. The
V
OUT
voltage is internally set to 5V.
CPO(Pin4):BoostedUnregulatedVoltage.Approximately
1.95V atlowloads.Bypasswitha≥2µFlowESRcapacitor.
IN
19285fa
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For more information www.linear.com/LTC 1928-5
LTC1928-5
BLOCK DIAGRAM
C
FLY
0.47µF
CP
CN/SHDN
5
6
CHARGE PUMP
AND
CPO
V
4
1
IN
C
CPO
SLEW CONTROL
C
IN
4.7µF
4.7µF
–
+
ENB
CLK B
+
–
POR/
SHDN
CONTROL
BURST
550kHz
OSCILLATOR
SD
+
–
V
3
OUT
V
= 1.235V
REF
C
OUT
160Ω
GND
4.7µF
SD
19285 BD
2
APPLICATIONS INFORMATION
Operation
erally, the charge pump runs open loop with continuous
clocking for low noise. If CPO is greater than 1.95V and
OUT
IN
TheLTC1928-5usesaswitched-capacitorchargepumpto
I
is less than 200µA, the charge pump will operate in
generate a CPO voltage of approximately 2V . CPO pow-
IN
Burst Mode operation for increased efficiency but slightly
higher output noise. In Burst Mode operation, the clock
ers an internal low dropout linear regulator that supplies
a regulated output at V . Internal comparators are used
OUT
is disabled when CPO reaches 1.95V and enabled when
IN
to sense CPO and V voltages for power-up conditioning.
IN
CPO droops by about 150mV. The switching frequency is
precisely controlled to ensure that the frequency is above
455kHz and at the optimum rate to ensure maximum
efficiency. The switch edge rates are also controlled to
minimize noise. The effective output resistance at CPO is
Theoutputcurrentissensedtodeterminethechargepump
operating mode. A trimmed internal bandgap is used as
the voltage reference and a trimmed internal oscillator is
used to control the charge pump switches.
The charge pump is a doubler configuration that uses
one external flying capacitor. When enabled, a 2-phase
nonoverlappingclockcontrolsthechargepumpswitches.
At start-up, the LDO is disabled and the load is removed
dependent on the voltage at V , CPO, the flying capacitor
IN
valueC andthejunctiontemperature.AlowESRcapaci-
FLY
tor of ≥2µF should be used at CPO for minimum noise.
The LDO is used to filter the ripple on CPO and to set an
fromCPO. WhenCPOreaches1.75V theLDOisenabled.
IN
output voltage independent of CPO. V
is set by an in-
OUT
If CPO falls below 1.45V the LDO will be disabled. Gen-
IN
19285fa
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For more information www.linear.com/LTC 1928-5
LTC1928-5
APPLICATIONS INFORMATION
ternal reference and resistor divider. The LDO requires a
exceeds 150°C the part will shut down. Excessive power
dissipation due to heavy loads will also cause the part
to shut down when the junction temperature exceeds
150°C. The part will become enabled when the junction
temperature drops below 140°C. If the fault conditions
remain in place, the part will cycle between the shutdown
and enabled states.
capacitoronV
forstabilityandimprovedloadtransient
OUT
response. A low ESR capacitor of ≥2µF should be used.
Maximum I Calculations
OUT
The maximum available current can be calculated based
on the open circuit CPO voltage, the dropout voltage of
the LDO and the effective output resistance of the charge
pump. The open circuit CPO voltage is approximately 2V
(see Figure 2).
Capacitor Selection
IN
For best performance it is recommended that low ESR
ceramic capacitors be used to reduce noise and ripple.
R
R
CPO
V
DROPOUT
CPO
C
must be ≥2µF and C
OUT IN
must be equal to or greater
OUT
CPO
V
OUT
+
–
than C . C is dependent on the input power supply
V
DROPOUT
+
source impedance. The charge pump demands large
instantaneous currents which may induce ripple onto
IOUT
2V
C
IN
CPO
–
19285 F02
a common voltage rail. C should be ≥2µF and a spike
IN
reducing resistor of 2.2Ω may be required between V
and the supply.
IN
Figure 2. Equivalent Circuit
AlowESRceramiccapacitorisrecommendedfortheflying
Example:
capacitor C with a value of 0.47µF. At low load or high
FLY
V = 3V
V a smaller capacitor could be used to reduce ripple on
IN
IN
V
= 5V
= 30Ω
CPO which would reflect as lower ripple on V
.
OUT
R
OUT
CPO
If a minimum enable time is required, the CPO output filter
capacitor should be at least 2× the V filter capacitor.
Maximum unloaded CPO voltage = 2V = 6V
IN
OUT
V
= 100mV
DROPOUT(MAX)
When the LDO is first enabled, the CPO capacitor will
I
= (2V – V
– V )/R
OUT(MAX)
IN
DROPOUT(MAX) OUT CPO
dump a large amount of charge into the V
capacitor.
IN
OUT
= (6V – 0.1V – 5V)/30Ω = 30mA
If the drop in the CPO voltage falls below 1.45V the LDO
V
must be greater than 1.45V = 4.35V. To confirm
will be disabled and the CPO voltage will be required to
charge up to 1.75V to enable the LDO. The resulting
CPO
IN
this, calculate V
:
CPO
IN
cycling extends the enable time.
V
CPO
= 6V – (30mA • 30Ω) = 5.1V
For minimum noise applications the LDO must be kept out
Output Ripple
of dropout to prevent CPO noise from coupling into V
.
OUT
The output ripple on CPO includes a spike component
from the charge pump switches and a droop component
which is dependent on the load current and the value of
C3. The charge pump has been carefully designed to mini-
mize the spike component, however, low ESR capacitors
are essential to reduce the remaining spike energy effect
External CPO Loading
The CPO output can drive an external load (for example,
an LDO). The current required by this additional load will
reduce the available current from V . If the external
load requires 1mA, the available current at V
reduced by 1mA.
OUT
will be
OUT
on the CPO voltage. C
should be increased for high
CPO
load currents to minimize the droop component. Ripple
components on CPO are greatly reduced at V by the
OUT
Short-Circuit and Thermal Protection
LDO, however, C
should also be a low ESR capacitor
OUT
to improve filtering of the CPO noise.
V
canbeshortedtogroundindefinitely.Internalcircuitry
OUT
will limit the output current. If the junction temperature
19285fa
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For more information www.linear.com/LTC 1928-5
LTC1928-5
APPLICATIONS INFORMATION
Shutdown
device dissipates the majority of its heat through its pins,
especially GND(Pin2). Thermal resistancetoambient can
be optimized by connecting GND to a large copper region
on the PCB, which serves as a heat sink. Applications
that operate the LTC1928-5 near maximum power levels
should maximize the copper area at all pins except CP and
CN/SHDN and ensure that there is some airflow over the
part to carry away excess heat.
When CN/SHDN = 0V, the part will be in shutdown, the
supply current will be <8µA and V
will be shorted
OUT
to ground through a 160Ω switch. In addition, CPO
will be high impedance and disconnected from V and
CN/SHDN.
IN
Shutdown is achieved by internally sampling the
CN/SHDN pin for a low voltage. Time between shutdown
samples is about 30µs. During the sample time the charge
pump switches are disabled and CN/SHDN must be pulled
to ground within 400ns. A resistor value between 100Ω
and1kisrecommended.Parasiticleadcapacitanceshould
be minimized on the CN/SHDN pin.
General Layout Considerations
Due to the high switching frequency and high transient
currents produced by the device, careful board layout is
a must. A clean board layout using a ground plane and
short connections to all capacitors will improve noise
performance and ensure proper regulation.
Power-On Reset
Upon initial power-up, a power-on reset circuit ensures
Measuring Output Noise
thattheinternalfunctionsarecorrectlyinitialized.OnceV
IN
Measuring the LTC1928 low noise levels requires care.
Figure 3 shows a test setup for taking the measurement.
Good connection and signal handling technique should
reaches about 1V, the power-on reset circuit will enable
the part as long as the CN/SHDN pin is not pulled low.
yield about 800µV over a 2.5MHz bandwidth. The noise
P-P
Thermal Considerations
measurement involves AC-coupling the LTC1928 output
into the test setup’s input and terminating this connec-
tion with 50Ω. Coaxial connections must be maintained
to preserve measurement integrity.
The power handling capability of the device will be limited
by the maximum rated junction temperature (125°C). The
devicedissipationP =I (2V –V )+V (2mA). The
D
OUT
IN
OUT
IN
BNC CABLES
OR COUPLERS
COUPLING
CAPACITOR
PREAMP
1822
LTC1928
DEMO
BOARD
BATTERY OR
LOW NOISE DC
POWER SUPPLY
V
OUT
+
–
INPUT
BANDWIDTH
FILTER
10×
OSCILLOSCOPE
R*
R
LOAD
R*
CONNECT BNC AND
GROUND TO THE
OUTPUT CAPACITOR
GROUND TERMINAL
R
PLACE BANDWIDTH FILTER
COMPONENTS IN SHIELDED BOX
WITH COAXIAL CONNECTORS
LOAD
R*
PLACE COUPLING
CAPACITOR IN SHIELDED
BOX WITH COAXIAL
CONNECTOR
*50Ω TERMINATIONS NOTE: KEEP BNC CONNECTIONS
19285 F03
HP-11048C OR
EQUIVALENT
AS SHORT AS POSSIBLE
Figure 3. LTC1928-5 Noise Measurement Test Setup
LTC1928-5
V
< 800µV
P-P
RIPPLE
ADDITIONAL
LDO
3
2
1
4
5
6
CPO
CP
V
5V
OUT
C
OUT
C
CPO
IN
4.7µF
4.7µF
GND
C
FLY
OUT
3.3V
10µF
0.47µF
V
IN
CN/SHDN
V
IN
GND
3V
C
IN
4.7µF
19285 F04
Figure 4. LTC1928-5, External Load on CPO, No Shutdown State
19285fa
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For more information www.linear.com/LTC 1928-5
LTC1928-5
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.4 MIN
1.50 – 1.75
(NOTE 4)
2.80 BSC
3.85 MAX 2.62 REF
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
19285fa
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For more information www.linear.com/LTC 1928-5
LTC1928-5
REVISION HISTORY
REV
DATE
DESCRIPTION
PAGE NUMBER
A
09/15 Revised package drawing.
8
19285fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
9
LTC1928-5
TYPICAL APPLICATION
LTC1928-5
V
V
V
< 800µV
P-P
IN
RIPPLE
C
1
5
6
3
4
2
V
5V
2.7V TO 4.4V
OUT
IN
C
IN
C
OUT
4.7µF
CPO
GND
CP
4.7µF
C
CPO
FLY
4.7µF
0.47µF
CN/SHDN
19285 F05
100Ω
2N7002
SHDN
Figure 5. Low Noise 5V Supply with Shutdown
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LTC3200
60µV
Noise, I
Up to 80mA, MSOP
RMS
OUT
I = 13µA, I
to 50mA, Shutdown
Q
OUT
20µA I , 20µV
Noise, 300mV Dropout
Q
RMS
Low Noise, 5V Output or Adjustable
19285fa
LT 0915 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
10
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LTC1928-5
●
●
LINEAR TECHNOLOGY CORPORATION 2000
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