LX1882
I N T E G R A T E D
P R O D U C T S
Charge Pump Doubler with Linear Regulator
P RODUCTION D ATA S HEET
The LX1882 is a two-stage boost
regulator featuring a charge pump
doubler with an integrated low dropout
linear regulator.
The first stage features an internal
doubler charge pump converting an input
supply of 1.8V to 4.4V, while the second
stage is an LDO regulating the boosted
voltage converting it to a regulated
output.
The LX1882 is capable of supplying up
to 50mA of output current with an
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KEY FEATURES
DESCRIPTION
Wide Input Voltage: 1.8V to 4.4V
3.3V and Adjustable (2.5V to
5.5V) Output Voltage Options
Inductor-less design using small
ceramic capacitors
Low Shutdown Current of 1µA
Internal Thermal Shutdown and
Current Limiting
550kHz Switching Operation
operating current of less than 150µA.
Quiescent current is reduced to < 5µA in
shutdown mode.
The LX1882’s internal regulator is stable
with either Tantalum or Ceramic low-value
capacitors, typically 2.2µF on the output,
allowing designers flexibility in external
component selection.
Reliability and safety features include
Thermal
Shutdown
Protection
and
Integrated Short-Circuit Protection.
APPLICATIONS/BENEFITS
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Cellular Telephone VCO Supplies
Medical Instrumentation
Data Acquisition
Wireless PCMCIA Applications
EMI Sensitive Boost Applications
PRODUCT HIGHLIGHT
8 CPO
SHDN 2
C3
7 C+
VOUT 1
LX1882-00
V IN
1.8V to 4.4V
6 V IN
OFF ON
VOUT 1
8 CPO
VOUT = 3.3V
C3
V OUT
C2
LX1882-33
C2
LED N+1
SHDN 2
7 C+
FB 3
VIN
2V to 4.4V
C1
6 VIN
FILT 3
5 C-
GND 4
CFILT
C1
C4
5 C-
C4
GND 4
LX1882: Adjustable Output; LED Driver
0 to 70
INPUT
LX1882: Fixed 3.3V Output
PACKAGE ORDER INFO
Plastic SOIC
DM
8-PIN
OUTPUT
DU
Plastic MSOP
8-PIN
RoHS Compliant / Pb-free
Transition DC: 0440
RoHS Compliant / Pb-free
Transition DC: 0432
1.8V – 4.4V
Adj
LX1882-00CDM
LX1882-00CDU
2V – 4.4V
3.3V
LX1882-33CDM
LX1882-33CDU
LX1882
TJ (°C)
OFF ON
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1882-00CDU-TR)
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX1882
I N T E G R A T E D
P R O D U C T S
Charge Pump Doubler with Linear Regulator
P RODUCTION D ATA S HEET
PACKAGE PIN OUT
VIN to GND .................................................................................................... -0.3V to 5V
VOUT Voltage.................................................................................................. -0.3V to 6V
CPO to Ground........................................................................................................... 10V
SHDN , FILT, FB Voltage to Ground........................................... -0.3V to (VIN + 0.3V)
VOUT Short –Circuit Duration.............................................................................Indefinite
IOUT .......................................................................................................................... 90mA
Operating Temperature Range
Commercial....................................................................................................0°C to 70°C
Storage Temperature ................................................................................ -65°C to 150°C
Maximum Junction Temperature ............................................................................ 125°C
Pb-free / RoHS Peak package Solder Reflow Temp. (40 second max. exposure)........260°C (+0, -5)
Note:
Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
THERMAL DATA
DM
1
8
CPO
SHDN
2
7
C+
FB
3
6
V IN
GND
4
5
C-
DM PACKAGE
(Top View)
VOUT
1
8
CPO
SHDN
2
7
C+
FB
3
6
VIN
GND
4
5
C-
______
DU PACKAGE
Plastic 8-Pin SOIC
(Top View)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
DU
V OUT
_______
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ABSOLUTE MAXIMUM RATINGS
163°C/W
38°C/W
RoHS / Pb-free 100% Matte Tin Lead Finish
Plastic 8-Pin MSOP
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
206°C/W
39°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION
PIN #
DESCRIPTION
VOUT
1
Regulated Output Voltage. It is recommended to bypass VOUT with a low ESR capacitor (> 2µF) placed as close
to the pin as possible for best performance. For the adjustable version, the output voltage range is 2.5V to 5.5V.
SHDN
2
Shutdown Pin. The LX1882 is in shutdown mode when a logic low is applied to this pin. Inversely, a logic high
applied to this pin enables the device. When in shutdown mode, the charge pump output is disconnected from VIN
(CPO will be high impedance) and VOUT is connected to ground through an internal 100Ω switch.
FB
3
Adjustable Version Only. The output voltage can be set by two resistors with the following relationship: VOUT =
FB * (1+ (R1/R2)) where R1 is the resistor connected between VOUT and FB, and R2 is the resistor connected
between FB and GND (see figure 3 on page 6).
FILT
3
Fixed Version Only. Filter pin for internal voltage reference. Typically a 1nF capacitor is connected from FILT to
GND.
GND
4
System Ground.
5
Flying Capacitor Negative Input.
VIN
6
Input Voltage. The input voltage range is 1.8V to 4.4V for the LX1882-00 and 2V to 4.4V for the LX1882-33.
VIN should be bypassed with a > 2µF low ESR capacitor placed as close to the pin as possible for best
performance. A minimum capacitance value of 0.1µF is required.
C+
7
Flying Capacitor Positive Input.
8
Charge Pump Output Voltage. CPO is approximately 1.95(VIN) at low loads. CPO should be bypassed with a low
ESR capacitor (>2µF).
C
-
CPO
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
PACKAGE DATA
PIN NAME
LX1882
I N T E G R A T E D
Charge Pump Doubler with Linear Regulator
P R O D U C T S
P RODUCTION D ATA S HEET
SIMPLIFIED BLOCK DIAGRAM
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C1
C+
V IN
1.8V to 4.4V
7
5
CCPO
CHARGE
PUMP
6
8
C3
C4
OFF ON
TSD
CLK
2
Power
-On
Reset
SDRG
SD2
550kHz
OSC
SHD
RG
SD2
1:100
VIN
1.175
Vref
V OUT
1
LDO
RG
SHD
C2
3
GND
LED N+1
FB
4
Figure 1 – LX1882-00 Block Diagram
BLOCK DIAGRAM
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX1882
I N T E G R A T E D
Charge Pump Doubler with Linear Regulator
P R O D U C T S
P RODUCTION D ATA S HEET
WWW . Microsemi .C OM
SIMPLIFIED BLOCK DIAGRAM
C1
C+
VIN
1.8V to 4.4V
7
5
CCPO
CHARGE
PUMP
6
8
C3
C4
TSD
CLK
OFF ON
2
Power
-On
Reset
SDRG
SD2
550kHz
OSC
SHD
RG
SD2
FILT
1:100
3
1
LDO
1nF
VIN
1.175
Vref
VOUT
C2
RG
SHD
R2
R1
GND
4
Figure 2 – LX1882-33 Block Diagram
BLOCK DIAGRAM
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX1882
I N T E G R A T E D
P R O D U C T S
Charge Pump Doubler with Linear Regulator
P RODUCTION D ATA S HEET
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C except where
otherwise noted. Test conditions: SHDN =VIN=3V, C1=0.22µF, C2 = C3 = C4 = 4.7µF
Parameter
Operating Voltage
Symbol
VIN
Test Conditions
LX1882-00
LX1882-33
IVIN Shutdown Current
SHDN =0V
IVIN Operating Current
IOUT=0mA, Burst Mode Operation
FB Input Current
FB Voltage
Regulated Output Voltage
VOUT Temperature Coefficient
Charge Pump Oscillator Frequency
CPO (Charge Pump Output) Output
Resistance
VOUT Dropout Voltage (Note 1)
VOUT Enable Time
VOUT Line Regulation
VOUT Load Regulation
VOUT Shutdown Resistance
SHDN Input Threshold
SHDN Input Current
VFB
VOUT
FOSC
RCPO
∆V
FB=1.175V
LX1882-00 only; IOUT=1mA
LX1882-33; IOUT=1mA
TA=25ºC
IOUT > 200µA, VIN=1.8V to 4.4V
VIN=1.8V, IOUT=10mA
VIN=3V, IOUT=10mA
VIN=4.4V, IOUT=10ma
LX1882-00; IOUT=10ma, VOUT=2.7V
LX1882-33; IOUT=10ma, VOUT=3.3V
IOUT=10mA, TA=25ºC
Min
LX1882-xx
Typ
Max
1.8
2.0
4.4
4.4
V
1
5
µA
250
400
µA
50
1.20
3.37
nA
V
V
ppm
kHz
Ω
Ω
Ω
-50
1.15
3.23
480
∆VOUT(VIN
VIN=3V to 4V, IOUT=0mA
)
∆VOUT(IOU IOUT=1mA to 10mA
IOUT=1ma to 50mA
T)
1.175
3.30
±150
550
22
16
10
100
75
350
620
30
20
20
160
120
Units
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ELECTRICAL CHARACTERISTICS
mV
µS
17
30
mV
3
40
10
mV
mV
SHDN =0V, Resistance Measured to GND,
VIN=1.8V
120
350
Ω
SHDN =0V, Resistance Measured to GND,
VIN=4.4V
50
150
Ω
1
1.6
V
VIN=1.8V to 4.4V
0.4
SHDN =VIN
-1
1
µA
SHDN =0V
-1
1
µA
Note 1: Dropout voltage is defined as the minimum input to output differential required to maintain regulation.
ELECTRICALS
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX1882
I N T E G R A T E D
P R O D U C T S
Charge Pump Doubler with Linear Regulator
P RODUCTION D ATA S HEET
APPLICATION INFORMATION
MAXIMUM VOUT AND IOUT CALCULATIONS (CONT’D)
Using a switched-capacitor charge pump, the LX1882
generates a charge pump output (CPO) voltage approximately
twice the input voltage. The charge pump is a doubler
configuration using one external flying capacitor. A 2-phase
non-overlapping clock, generated from an internally trimmed
oscillator, controls the charge pump switches to ensure
maximum efficiency. CPO powers an internal low dropout
(LDO) linear regulator providing a regulated output at VOUT.
CPO can also be used to drive an external load; refer to section
on CPO Loading. The CPO voltage and VIN are sensed via
internal comparators for power-up conditioning. At power-up,
the LDO is disabled and the load is removed from CPO. The
LDO is enabled when the CPO voltage reaches 1.75(VIN). When
the CPO voltage drops below 1.45(VIN), the LDO is disabled.
Sensing the LX1882 output current determines the charge pump
operating mode. If the output current is less than 100uA and the
CPO voltage is greater than 1.95(VIN), the charge pump operates
in Burst Mode. In Burst Mode, the clock is disabled for
increased efficiency, until the CPO voltage droops
approximately 100mV at which time the clock is enabled. To
minimize noise at CPO, a low ESR capacitor of at least 2uF
should be used.
The internal LDO can supply up to 50mA of output current
and requires an output capacitor between VOUT and GND to
stabilize the internal control loop. A low ESR capacitor of at
least 2uF is recommended.
The maximum available output voltage can be calculated given
a minimum input voltage and output current load using the
following equation:
VOUT(max) = 2(VIN(min) – (IOUT)(RCPO) - VDROPOUT
ADJUSTABLE OUTPUT VOLTAGE
The LX1882-00 develops a 1.175 reference voltage between the
FB pin and GND. The output voltage can be set using an
external resistor divider (see Figure 3).
8 CPO SHDN 2
C3
7 C+
VIN
1.8V to 4.4V
C4
VOUT 1
LX1882-00
6 VIN
OFF ON
R1
FB 3
C2
R2
C1
5 C-
GND 4
VOUT = 1.175 [1+(R1/R2)]
The output voltage range is 2.5V to 5.5V.
For minimum noise applications, keep the LDO out of dropout to
prevent CPO noise from coupling into VOUT.
CAPACITOR SELECTION
To reduce noise and ripple, it is recommended to use low ESR
capacitors for C2 (VOUT), C3 (CPO), and C4 (VIN); see Figure 1.
For stability purposes, C2 must be at least 2uF and C3 must be
equal to or greater than C2. It is also recommended that C4 be at
least 2uF. A 2.2Ω resistor may be required between VIN and the
supply to reduce ripple that may be induced onto the voltage rail
due to large instantaneous currents demanded by the charge
pump.
A 0.22uF, low ESR ceramic capacitor is recommended for C1
(charge pump flying capacitor). To improve VOUT ripple for light
loads or for high VIN, a smaller capacitor could be used for C1 to
reduce ripple on CPO.
To minimize the enable time, the CPO filter capacitor (C3)
should be at least 2x the VOUT filter capacitor (C2). At power-up,
the LDO is disabled and the load is removed from CPO. When
the CPO voltage reaches 1.75(VIN) the LDO is enabled and a
large amount of charge is dumped from the CPO capacitor into
the VOUT capacitor. If the amount of charge dumped causes the
CPO voltage to fall below 1.45(VIN), the LDO will be disabled
and the CPO voltage will have to charge up to 1.75(VIN) to
enable the LDO. This cycle results in an extended enable time.
For the LX1882-33, a 1nF filter capacitor should be connected
between the FILT pin and GND for optimum noise performance.
CPO LOADING
MAXIMUM VOUT AND IOUT CALCULATIONS
Using the open circuit CPO voltage (≈ 2(VIN)), the dropout
voltage of the LDO, and the effective charge pump output
resistance, the maximum available output voltage and current
can be calculated.
Copyright © 2000
Rev. 1.0e, 2005-03-03
VOUT < 5.5 and (IOUT)(RCPO) < 0.55VIN, 0.2V < 1.65V
The CPO can drive an external load. Current draw by the
external load will reduce the maximum available current at VOUT
(i.e. if CPO is driving a 5mA load, the available current from
VOUT will be reduced by 5mA).
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
APPLICATION
Figure 3. LX1882-00; Adjustable Version
with the condition that (IOUT )(RCPO ) < 0.55VIN .
Example:
VIN(max) = 3V
IOUT = 10mA
RCPO(max) = 20Ω
Unloaded CPO Voltage (max) = 6V
Loaded CPO Voltage = 6V – (10mA)(20Ω) = 5.8V
VDROPOUT = 0.075V
VOUT(max) = (6V) – (0.2) – (0.075) = 5.73
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OPERATION
LX1882
I N T E G R A T E D
P R O D U C T S
Charge Pump Doubler with Linear Regulator
P RODUCTION D ATA S HEET
POWER-ON RESET
Temperature Protection
The LX1882 contains power-on reset circuitry that insures all
internal functions are correctly initialized upon power-up. Once
the input voltage reaches approximately 1V, the power-on reset
circuit enables the device as long as the SHDN pin is held high.
The thermal protection shuts the LX1882 down when the
junction temperature exceeds 1400C. Exposure to absolute
maximum rated conditions for extended periods may affect
device reliability (see Thermal Considerations below).
SHUTDOWN
The SHDN pin allows the LX1882 to be enabled or disabled.
A logic zero (0.4V) on the SHDN pin places the LX1882 in
shutdown mode, reducing the supply current to < 5uA and
connecting VOUT to ground through a 100Ω switch. In addition,
CPO will be high impedance and disconnected from VIN. If the
shutdown feature is not required, connect SHDN to VIN to
continuously enable the part.
Current Limit Protection
THERMAL CONSIDERATIONS
Thermal shutdown protects the circuit from thermal overload
caused from a rise in junction temperature during power
dissipation. This means of protection is intended for fault
protection only and not as a means from current or power
limiting during normal application usage. Proper thermal
evaluation should be done to ensure that the junction temperature
does not exceed its maximum rating (125°C). Due to variation in
individual device electrical characteristics and thermal resistance,
the built in thermal overload protection may be activated at
power levels slightly above or below the rated dissipation.
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APPLICATION INFORMATION (CONTINUED)
The LX1882 includes over current protection. When the output
load current exceeds typically 60mA, the circuit forces the
regulator output to decrease.
APPLICATION
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX1882
I N T E G R A T E D
P R O D U C T S
Charge Pump Doubler with Linear Regulator
P RODUCTION D ATA S HEET
EVALUATION BOARD
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Figure 5. LX1882 LED Driver Evaluation Board (Bottom View)
Figure 4. LX1882 LED Driver Evaluation Board (Top View)
Table 1: Input and Output Pin Assignments
Pin Name
VIN
VOUT
FB
CPO
SHDN
GND
External VCC
Description
Input Voltage Test Point. Use this pin to monitor the input voltage.
Output Voltage Test Point. Use this pin to monitor output voltage. Output Voltage is determined using the following
equation: VOUT = VFB [1 + (R1/R2)] – VSET (R1/R2); where VSET = ILED (R3) and VFB = 1.175V (see Figure 6).
Feedback Pin Test Point. Use this pin to monitor feedback voltage. Min = 1.150V, Typical = 1.175V, Max = 1.20V.
Charge Pump Output Test Point. Use this pin to monitor the charge pump output or connect an external load to this
pin for the charge pump to drive. Note: Maximum output current available is reduced by the amount of current
drawn from the CPO pin.
Shutdown Test Point. Use this pin to monitor operating status of device. Logic HIGH = enabled; Logic LOW =
shutdown mode (see Table 2 below).
System Ground Test Points.
External DC Input Voltage. Apply a 1.8V to 4.4V input to this pin when switch “VCC” is set to “EXT”. . Clip the
positive lead of the external power supply to the pin of the 2-pin header labeled “External VCC +”. Clip the negative
lead of the external power supply to the pin of the 2-pin header labeled “External VCC –“.
Table 2: Switch Position Assignments
Functional Description
VCC EXT
Use this position when powering the board from an external power supply.
VCC BAT
Use this position when powering the board using “AA” batteries. Three “AA” batteries can be installed
via battery clips located on the back of the board.
SHDN ENABLE
Use this position to enable the LX1882.
SHDN DISABLE
Use this position to disable the LX1882.
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
EVALUATION BOARD
Switch Name
Page 8
LX1882
I N T E G R A T E D
Charge Pump Doubler with Linear Regulator
P R O D U C T S
P RODUCTION D ATA S HEET
Table 3: Factory Installed Component List for the LX1882 Evaluation Board
Quantity
Part
Reference
1
C1
3
C2 - C4
4
D1 - 4
Description
Manufacturer
Part
Number
Panasonic
ECJ2VB1C224K
Capacitor, Ceramic, 0.22uF, 16V, 10%, 0805 Type SMT
Capacitor, Ceramic X5R, 4.7uF, 25V, 1210 Type SMT
White LED
Taiyo Yuden
CETMK325BJ475MN
Chicago Miniature
CMD333UWC
3
J1 – J3
Terminal Battery Clip, Positive Button, AA Contacts
Keystone
596
3
J4 – J6
Terminal Battery Clip, Negative Button, AA Contacts
Keystone
590
1
P2
Header, 2-Pin
Molex
42375-2
1
R1
Resistor, 46.4K, 1/10W,1%, 0805 Type SMT
Panasonic
ERJ6EKF4642
1
R2
Resistor, 14.3K, 1/10W,1%, 0805 Type SMT
Panasonic
ERJ6EKF1432
4
R3 - R6
Resistor, 30.1, 1/10W,1%, 0805 Type SMT
Panasonic
ERJ6EKF30R1
Resistor, 10.0K, 1/10W,1%, 0805 Type SMT
Panasonic
ERJ6EKF1002
CTS
204-121ST
1
R8
2
S1, S2
9
TP1 – TP9
1
U1
Switch, SPDT, 1 position, SMT DIP Type
Terminal, Surface Mount, Compact Style Test Point
Keystone
5016
IC, LX1882 Charge Pump Doubler with Linear Regulator
Microsemi
LX1882-00CDM
R8
10.0k
ENABLE
DISABLE
J1
"AA" Battery
CPO
J2
C3
4.7µF
25V
"AA" Battery
J3
VBAT
"AA" Battery
EXT
+
External VCC
-
SHDN
S2
CPO
C1
0.22µF
16V
VOUT
VOUT
C+
SHDN
VIN
FB
C-
GND
R1
46.4K
VFB
C2
4.7µF
25V
R2
14.3k
D1
D2
D3
R4
30.1
R5
30.1
D4
VSET
S1
C4
0.1µF
25V
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EVALUATION BOARD (CONTINUED)
GND
VIN
GND
FB
ILED
R3
30.1
R6
30.1
GND
GND
EVALUATION BOARD
VOUT = VFB[1+(R1/R2) - VSET(R1/R2); where VSET = ILED(R3), VFB = 1.175V
Figure 6 – LX1882-00 Evaluation Board Schematic; LED Driver Application
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX1882
I N T E G R A T E D
Charge Pump Doubler with Linear Regulator
P R O D U C T S
P RODUCTION D ATA S HEET
23
3.35
21
3.34
19
3.33
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CHARACTERISTIC CURVES
LX2.5V
LX3.0V
LX3.5V
LX4.0V
CPO RESISTANCE (Ohms)
3.32
VOUT VOLTAGE (V)
17
15
13
11
LX4.5V
3.31
3.30
3.29
3.28
9
3.27
7
3.26
3.25
5
2
2.25
2.5
2.75
3
3.25
3.5
3.75
4
4.25
0
4.5
5
10
15
20
25
30
35
OUTPUT LOAD CURRENT (mA)
VIN (V)
Figure 7 – CPO Output Resistance vs. Input Voltage;
TA = 25°C, C1 = 0.22µF, C2, C3, C4 = 4.7µF, CFILT = 0.1µF
40
45
50
Figure 8 – LX1882-33 Output Voltage vs. Load Current;
TA = 25°C, C1 = 0.22µF, C2, C3, C4 = 4.7µF, CFILT = 0.1µF
1.185
3.38
3.36
1.180
VOUT VOLTAGE (V)
VOUT VOLTAGE (V)
3.34
3.32
3.30
3.28
3.26
3.24
1.175
1.170
1.165
1.160
VIN=2.0V
VIN=2.0V
1.155
VIN=4.4V
3.22
VIN=4.4V
1.150
3.20
-25
0
25
50
75
100
-50
125
Figure 9 – LX1882-33 Output Voltage vs. Temperature;
C1 = 0.22µF, C2, C3, C4 = 4.7µF, CFILT = 0.1µF
Copyright © 2000
Rev. 1.0e, 2005-03-03
-25
0
25
50
75
100
125
TEMPERATURE ('C)
TEMPERATURE ('C)
Figure 10 – LX1882-00 Output Voltage vs. Temperature;
C1 = 0.22µF, C2, C3, C4 = 4.7µF
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
CHARTS
-50
LX1882
I N T E G R A T E D
Charge Pump Doubler with Linear Regulator
P R O D U C T S
P RODUCTION D ATA S HEET
9
WWW . Microsemi .C OM
CHARACTERISTIC CURVES
10
9
8
7
6
LX00mA
LX01mA
5
7
CPO VOLTAGE (V)
CPO VOLTAGE (V)
8
LX10mA
6
5
4
LX25mA
4
3
LX50mA
LX2.0V
LX3.0V
LX4.0V
2
3
2.00
2.25
2.50
2.75
3.00
3.25
3.50
3.75
4.00
4.25
LX2.5V
LX3.5V
LX4.5V
1
4.50
0
5
10
15
VIN (V)
Figure 11 – CPO Voltage vs. Input Voltage;
TA = 25°C, C1 = 0.22µF, C2, C3, C4 = 4.7µF, CFILT = 0.1µF
25
30
35
40
45
50
Figure 12 – CPO Voltage vs. Load Current;
TA = 25°C, C1 = 0.22µF, C2, C3, C4 = 4.7µF, CFILT = 0.1µF
90%
120
80%
110
70%
100
EFFICIENCY - (%)
VOUT SHDN RESISTANCE - ( Ohms )
20
OUTPUT LOAD CURRENT (mA)
90
80
70
60%
50%
40%
30%
20%
60
10%
2.0V
2.5V
3.0V
3.5V
4.0V
4.5V
1.5
2
2.5
3
3.5
4
4.5
0
5
Figure 13 – VOUT Shutdown Resistance vs. Input Voltage;
TA = 25°C, C1 = 0.22µF, C2, C3, C4 = 4.7µF, CFILT = 0.1µF
Copyright © 2000
Rev. 1.0e, 2005-03-03
5
10
15
20
25
30
35
40
45
50
OUTPUT LOAD CURRENT - (mA)
INPUT VOLTAGE ( V )
Figure 14 – Efficiency vs. Output Current;
TA = 25°C, C1 = 0.22µF, C2, C3, C4 = 4.7µF, CFILT = 0.1µF
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
CHARTS
0%
50
LX1882
I N T E G R A T E D
Charge Pump Doubler with Linear Regulator
P R O D U C T S
P RODUCTION D ATA S HEET
DU
8-Pin MSOP
A
Dim
B
H
G
P
M
C
N
DM
K
L
D
A
B
C
D
G
H
J
K
L
M
N
P
MILLIMETERS
MIN
MAX
2.85
3.05
2.90
3.10
–
1.10
0.25
0.40
0.65 BSC
0.38
0.64
0.13
0.18
0.95 BSC
0.40
0.70
3°
0.05
0.15
4.75
5.05
INCHES
MIN
MAX
.112
.120
.114
.122
–
0.043
0.009
0.160
0.025 BSC
0.015
0.025
0.005
0.007
0.037 BSC
0.016
0.027
3°
0.002
0.006
0.187
0.198
MILLIMETERS
MIN
MAX
4.83
5.00
3.81
3.94
1.35
1.75
0.33
0.51
0.77
1.27 BSC
0.19
0.25
0.13
0.25
4.80
5.21
8°
5.79
6.20
0.10
INCHES
MIN
MAX
0.190
0.197
0.150
0.155
0.053
0.069
0.013
0.020
0.030
0.050 BSC
0.007
0.010
0.005
0.010
0.189
0.205
8°
0.228
0.244
0.004
WWW . Microsemi .C OM
MECHANICAL DRAWING
8-Pin Plastic SOIC
Dim
A
P
B
G
L
D
K
J
F
*Lead Coplanarity
Note:
1. Dimensions do not include mold flash or protrusions;
these shall not exceed 0.155mm(.006”) on any side.
Lead dimension shall not include solder coverage.
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 12
MECHANICALS
M
C
A
B
C
D
F
G
J
K
L
M
P
*LC
LX1882
I N T E G R A T E D
P R O D U C T S
Charge Pump Doubler with Linear Regulator
P RODUCTION D ATA S HEET
WWW . Microsemi .C OM
NOTES
NOTES
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is current as of publication date. This document may not be modified in
any way without the express written consent of Microsemi. Product processing does not
necessarily include testing of all parameters. Microsemi reserves the right to change the
configuration and performance of the product and to discontinue product at any time.
Copyright © 2000
Rev. 1.0e, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 13