LTC1928ES6-5#TR [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#TR |
| 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 稳压器 开关式稳压器或控制器 电源电路 开关式控制器 光电二极管 泵 |
| 文件： | 总8页 (文件大小：159K) |
| 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
U
FEATURES
DESCRIPTIO
TheLTC®1928-5isadoublerchargepumpwithaninternal
low noise, low dropout (LDO) linear regulator. The part is
designedtoprovidealownoiseboostedsupplyvoltagefor
powering noise sensitive devices such as high frequency
VCOs in wireless applications.
■
Low Output Noise: 90
Fixed Output Voltage: 5V
µVRMS (100kHz BW)
■
■
■
■
■
■
■
■
■
■
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) ThinSOTTM Package
U
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.
Theregulatoriscapableofsupplyingupto30mAofoutput
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.
APPLICATIO S
■
The LTC1928-5 LDO regulator is stable with only 2µF on
the output. Small ceramic capacitors can be used, reduc-
ing PC board area.
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
■
■
■
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.
■
U
TYPICAL APPLICATION
Output Noise (BW = 10Hz to 2.5MHz)
LTC1928-5
5V
3
4
2
V
1
5
6
IN
2.7V TO 4.4V
V
V
V
OUT
IN
OUT
4.7µF
4.7µF
VOUT
200µV/DIV
CP
CPO
GND
4.7µF
0.47µF
CN/SHDN
19285 F01
Figure 1. Low Noise 5V Power Supply
C
CPO = COUT = 4.7µF 100µs/DIV
19285 TA01
IOUT = 10mA
V
IN = 3V
VOUT = 5V
TA = 25°C
1
LTC1928-5
W W U W
U W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
ORDER PART
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
NUMBER
TOP VIEW
V
1
2
3
6
5
4
CN/SHDN
CP
IN
LTC1928ES6-5
GND
V
CPO
OUT
S6 PART MARKING
LTKT
S6 PACKAGE
6-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 230°C/ W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● 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
4.4
8
UNITS
V
V
Operating Voltage
Shutdown Current
Operating Current
●
●
●
●
2.7
IN
I
I
SHDN = 0V (Note 5)
4
µA
VIN
VIN
I
I
= 0mA, Burst ModeTM Operation
190
5
330
5.1
µA
OUT
OUT
Regulated Output Voltage
Temperature Coefficient
= 1mA
4.9
V
V
±50
550
ppm
kHz
OUT
Charge Pump Oscillator Frequency
CPO Output Resistance
I
> 500µA, V = 2.7V to 4.4V
●
480
620
OUT
IN
V
V
= 2.7V, I
= 4.4V, I
= 10mA
= 10mA
●
●
17
14
30
24
Ω
Ω
IN
IN
OUT
OUT
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
OUT
OUT
µV
P-P
V
V
Line Regulation
Load Regulation
V
= 2.7V to 4.4V, I = 0
OUT
●
●
4
20
10
mV
OUT
OUT
IN
I
I
= 1mA to 10mA
= 1mA to 30mA (Note 4)
2
4
mV
mV
OUT
OUT
V
Shutdown Resistance
CN/SHDN = 0V (Note 5)
OUT
V
V
= 2.7V, Resistance Measured to Ground
= 4.4V, Resistance Measured to Ground
●
●
160
100
400
300
Ω
Ω
IN
IN
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
CN/SHDN = 0V (Note 5)
µA
Burst Mode is a trademark of Linear Technology Corporation.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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
– V
(see Figure 2).
CPO
DROPOUT
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.
2
LTC1928-5
ELECTRICAL CHARACTERISTICS
Note 4: Operating conditions are limited by maximum junction
temperature. The regulated output specification will not apply for all
possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range may be
limited. When operating at maximum output current, the input voltage
range may be limited.
Note 5: CN/SHDN must be driven with a source impedance of at least
100Ω (R ) to prevent damage to the part. This pin is multiplexed
SOURCE
and may be connected through a low switch impedance to V . There may
IN
be a large amount of current (V /R
) until the shutdown state
IN SOURCE
occurs after which the charge pump switches at CN/SHDN become high
impedance and the current will fall to <8µA.
U W
TYPICAL PERFOR A CE 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
C
I
= 25°C
T = 25°C
A
A
= 0.47µF
FLY
= 10mA
OUT
V
= 2(V )
IN
CPO
0
T
= 25°C
A
(A)
V
V
C
= 3V
–5
–10
15
10
5
IN
= 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
2.5
3.0
3.5
(V)
4.0
4.5
0
50
100
150
TIME (µs)
200
300
V
V
IN
IN
19285 G01
19285 G03
(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
2
0
5
4
3
2
1
0
I
= 10mA
0
5
4
3
2
1
0
NO LOAD
T
= 25°C
A
T
= 25°C
V
V
I
= 3V
A
IN
OUT
V
V
C
= 3V
= 5V
IN
OUT
OUT
= 5V
= 10mA
OUT
= 4.7µF
C
= C
= 4.7µF
OUT
CPO
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
200µs/DIV
1ms/DIV
19285 G04
19285 G05
19285 G06
3
LTC1928-5
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TYPICAL PERFOR A CE 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
100
90
4.901
4.900
4.989
4.988
4.987
4.986
4.985
4.984
4.983
4.982
T
I
= 25°C
T
V
C
= 25°C
T
= 25°C
A
A
A
= 15mA
= 3V
OUT
IN
C
= 0.47µF
= 0.47µF
FLY
FLY
80
70
60
50
40
20
OUTPUT CURRENT (mA)
0
5
10 15
25 30 35 40
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
SUPPLY VOLTAGE (V)
2.5
3.0
3.5
(V)
4.0
4.5
V
IN
19285 G07
19285 G09
19285 G08
W
BLOCK DIAGRA
C
FLY
0.47µF
CP
CN/SHDN
6
5
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
4.7µF
160Ω
SD
19285 BD
2
GND
4
LTC1928-5
U
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PIN FUNCTIONS
VIN (Pin 1): Input Voltage, 2.7V to 4.4V. VIN should be
bypassed with a ≥2µF low ESR capacitor as close to the
pin as possible for best performance. A minimum capaci-
tance value of 0.1µF is required.
CPO (Pin 4): Boosted Unregulated Voltage. Approxi-
mately 1.95VIN at low loads. Bypass with a ≥2µF low ESR
capacitor.
CP (Pin 5): Flying Capacitor Positive Input.
GND (Pin 2): System Ground.
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.
V
OUT (Pin 3): Low Noise Regulated Output Voltage. VOUT
should be bypassed with a ≥2µF low ESR capacitor as
closetothepinaspossibleforbestperformance.TheVOUT
voltage is internally set to 5V.
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APPLICATIONS INFORMATION
Operation
The LDO is used to filter the ripple on CPO and to set an
output voltage independent of CPO. VOUT is set by an
internal reference and resistor divider. The LDO requires a
capacitoronVOUT forstabilityandimprovedloadtransient
response. A low ESR capacitor of ≥2µF should be used.
The LTC1928-5 uses a switched-capacitor charge pump
to generate a CPO voltage of approximately 2VIN. CPO
powers an internal low dropout linear regulator that sup-
plies a regulated output at VOUT. Internal comparators are
used to sense CPO and VIN voltages for power-up condi-
tioning. The output current is sensed to determine the
chargepumpoperatingmode.Atrimmedinternalbandgap
is used as the voltage reference and a trimmed internal
oscillator is used to control the charge pump switches.
Maximum IOUT Calculations
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 2VIN
(see Figure 2).
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
fromCPO. WhenCPOreaches1.75VIN theLDOisenabled.
If CPO falls below 1.45VIN the LDO will be disabled. Gen-
erally, the charge pump runs open loop with continuous
clocking for low noise. If CPO is greater than 1.95VIN and
IOUT is less than 200µA, the charge pump will operate in
Burst Mode operation for increased efficiency but slightly
higher output noise. In Burst Mode operation, the clock is
disabled when CPO reaches 1.95VIN and enabled when
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 effi-
ciency. The switch edge rates are also controlled to mini-
mize noise. The effective output resistance at CPO is
dependent on the voltage at VIN, CPO, the flying capacitor
value CFLY and the junction temperature. A low ESR ca-
pacitorof≥2µFshouldbeusedatCPOforminimumnoise.
Example:
VIN = 3V
VOUT = 5V
RCPO = 30Ω
Maximum unloaded CPO voltage = 2VIN = 6V
VDROPOUT(MAX) = 100mV
IOUT(MAX) = (2VIN – VDROPOUT(MAX) – VOUT)/RCPO
= (6V – 0.1V – 5V)/30Ω = 30mA
VCPO must be greater than 1.45VIN = 4.35V. To confirm
this, calculate VCPO
:
VCPO = 6V – (30mA • 30Ω) = 5.1V
For minimum noise applications the LDO must be kept out
of dropout to prevent CPO noise from coupling into VOUT
.
5
LTC1928-5
APPLICATIONS INFORMATION
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A low ESR ceramic capacitor is recommended for the
flying capacitor CFLY with a value of 0.47µF. At low load or
high VIN a smaller capacitor could be used to reduce ripple
R
R
CPO
V
DROPOUT
CPO
V
OUT
+
–
V
DROPOUT
+
IOUT
2V
C
IN
CPO
on CPO which would reflect as lower ripple on VOUT
.
–
If a minimum enable time is required, the CPO output filter
capacitor should be at least 2× the VOUT filter capacitor.
When the LDO is first enabled, the CPO capacitor will
dump a large amount of charge into the VOUT capacitor. If
the drop in the CPO voltage falls below 1.45VIN the LDO
will be disabled and the CPO voltage will be required to
charge up to 1.75VIN to enable the LDO. The resulting
cycling extends the enable time.
19285 F02
Figure 2. Equivalent Circuit
External CPO Loading
TheCPOoutputcandriveanexternalload(forexample, an
LDO). The current required by this additional load will
reduce the available current from VOUT. If the external load
requires1mA, theavailablecurrentatVOUT willbereduced
by 1mA.
Output Ripple
The output ripple on CPO includes a spike component
from the charge pump switches and a droop component
whichisdependentontheloadcurrentandthevalueofC3.
The charge pump has been carefully designed to minimize
the spike component, however, low ESR capacitors are
essential to reduce the remaining spike energy effect on
the CPO voltage. CCPO should be increased for high load
currents to minimize the droop component. Ripple com-
ponents on CPO are greatly reduced at VOUT by the LDO,
however, COUT should also be a low ESR capacitor to
improve filtering of the CPO noise.
Short-Circuit and Thermal Protection
VOUT can be shorted to ground indefinitely. Internal cir-
cuitry will limit the output current. If the junction tempera-
ture 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.
Shutdown
When CN/SHDN = 0V, the part will be in shutdown, the
supply current will be <8µA and VOUT will be shorted to
ground through a 160Ω switch. In addition, CPO will be
high impedance and disconnected from VIN and
CN/SHDN.
Capacitor Selection
For best performance it is recommended that low ESR
ceramic capacitors be used to reduce noise and ripple.
COUT must be ≥2µF and CCPO must be equal to or greater
than COUT. CIN is dependent on the input power supply
source impedance. The charge pump demands large
instantaneous currents which may induce ripple onto a
common voltage rail. CIN should be ≥2µF and a spike
reducing resistor of 2.2Ω may be required between VIN
and the supply.
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.
6
LTC1928-5
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APPLICATIONS INFORMATION
Power-On Reset
General Layout Considerations
Upon initial power-up, a power-on reset circuit ensures
that the internal functions are correctly initialized. Once
VIN reaches about 1V, the power-on reset circuit will
enable the part as long as the CN/SHDN pin is not pulled
low.
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 perfor-
mance and ensure proper regulation.
Thermal Considerations
Measuring Output Noise
The power handling capability of the device will be limited
by the maximum rated junction temperature (125°C). The
devicedissipationPD =IOUT(2VIN –VOUT)+VIN(2mA). The
device dissipates the majority of its heat through its pins,
especially GND (Pin 2). Thermal resistance to ambient can
be optimized by connecting GND to a large copper region
on the PCB, which serves as a heat sink. Applications that
operatetheLTC1928-5nearmaximumpowerlevelsshould
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.
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
yield about 800µVP-P over a 2.5MHz bandwidth. The noise
measurement involves AC coupling the LTC1928 output
into the test setup’s input and terminating this connection
with 50Ω. Coaxial connections must be maintained to
preserve measurement integrity.
BNC CABLES
OR COUPLERS
COUPLING
CAPACITOR
LTC1928
PREAMP
1822
BATTERY OR
LOW NOISE DC
POWER SUPPLY
V
OUT
+
–
DEMO
INPUT
BANDWIDTH
FILTER
BOARD
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
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1928-5
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APPLICATIONS INFORMATION
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
U
PACKAGE DESCRIPTION
S6 Package
6-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1634)
(Reference LTC DWG # 05-08-1636)
SOT-23
(Original)
SOT-23
(ThinSOT)
.90 – 1.45
1.00 MAX
A
A1
A2
L
(.035 – .057)
(.039 MAX)
.00 – 0.15
(.00 – .006)
.01 – .10
(.0004 – .004)
2.80 – 3.10
(.110 – .118)
(NOTE 3)
.90 – 1.30
(.035 – .051)
.80 – .90
(.031 – .035)
.35 – .55
(.014 – .021)
.30 – .50 REF
(.012 – .019 REF)
.20
(.008)
A2
A
DATUM ‘A’
2.60 – 3.00
1.50 – 1.75
(.102 – .118) (.059 – .069)
(NOTE 3)
1.90
(.074)
REF
L
PIN ONE ID
.09 – .20
(.004 – .008)
(NOTE 2)
A1
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
(INCHES)
3. DRAWING NOT TO SCALE
.95
(.037)
REF
.25 – .50
4. DIMENSIONS ARE INCLUSIVE OF PLATING
(.010 – .020)
5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
6. MOLD FLASH SHALL NOT EXCEED .254mm
7. PACKAGE EIAJ REFERENCE IS:
SC-74A (EIAJ) FOR ORIGINAL
JEDEL MO-193 FOR THIN
(6PLCS, NOTE 2)
S6 SOT-23 0401
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1928f LT/TP 0601 2K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 2000
相关型号：
LTC1928ES6-5#TRM
LTC1928-5 - Doubler Charge Pump with Low Noise Linear Regulator in SOT-23; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C
Linear
LTC1928ES6-5#TRMPBF
LTC1928-5 - Doubler Charge Pump with Low Noise Linear Regulator in SOT-23; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C
Linear
LTC1929CG#PBF
LTC1929 - 2-Phase, High Efficiency, Synchronous Step-DownSwitching Regulators; Package: SSOP; Pins: 28; Temperature Range: 0°C to 70°C
Linear
LTC1929CG#TR
LTC1929 - 2-Phase, High Efficiency, Synchronous Step-DownSwitching Regulators; Package: SSOP; Pins: 28; Temperature Range: 0°C to 70°C
Linear
LTC1929CG#TRPBF
LTC1929 - 2-Phase, High Efficiency, Synchronous Step-DownSwitching Regulators; Package: SSOP; Pins: 28; Temperature Range: 0°C to 70°C
Linear
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