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LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
DESCRIPTION The LX1882 is a two-stage boost regulator featuring a charge pump doubler with an integrated low dropout linear regulator. This configuration allows for a low noise boosted output for powering noise sensitive applications. 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 low noise output. The LX1882 is capable of supplying up to 50mA of output current with an operating current of less than 150A. Quiescent current is reduced to < 5A in shutdown mode. The LX1882's internal regulator is stable with either Tantalum or Ceramic low-value capacitors, typically 2.2F on the output, allowing designers flexibility in external component selection. Reliability and safety features include Thermal Shutdown Protection and Integrated Short-Circuit Protection.
KEY FEATURES 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 1A Internal Thermal Shutdown and Current Limiting 550kHz Switching Operation APPLICATIONS/BENEFITS Cellular Telephone VCO Supplies Medical Instrumentation Data Acquisition Wireless PCMCIA Applications EMI Sensitive Boost Applications
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IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
PRODUCT HIGHLIGHT
8 CPO C3 7 C+
SHDN 2 V OUT 1
OFF ON VOUT C2
LED N+1
8 CPO C3
VOUT 1
VOUT = 3.3V C2
LX1882-33
7 C+ VIN 2V to 4.4V C1 6 VIN 5 CSHDN 2 FILT 3 CFILT GND 4 OFF ON
LX1882-00
VIN 1.8V to 4.4V C1 C4 5 CGND 4 6 V IN FB 3
C4
LX1882: Adjustable Output; LED Driver
LX1882: Fixed 3.3V Output
TJ (C) 0 to 70
PACKAGE ORDER INFO Plastic SOIC OUTPUT INPUT DM 8-PIN 1.8V - 4.4V Adj LX1882-00CDM 2V - 4.4V 3.3V LX1882-33CDM
LX1882 LX1882
DU
Plastic MSOP 8-PIN LX1882-00CDU LX1882-33CDU
Note: Available in Tape & Reel. Append the letter "T" to the part number. (i.e. LX1882-00CDUT)
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS 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 ................................................................................................... 0C to 70C Storage Temperature ................................................................................ -65C to 150C Lead Temperature (Soldering 10sec).......................................................................300C Maximum Junction Temperature.............................................................................125C
Note:
PACKAGE PIN OUT
V OUT
_______
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1 2 3 4
8 7 6 5
CPO C+ V IN C-
SHDN FB GND
DM PACKAGE
(Top View)
______
VOUT
1 2 3 4
8 7 6 5
CPO C+ VIN C-
Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. SHDN Currents are positive into, negative out of specified terminal. FB
THERMAL DATA
GND
DM
Plastic 8-Pin SOIC 163C/W 38C/W
DU PACKAGE
(Top View)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA THERMAL RESISTANCE-JUNCTION TO CASE, JC
DU
Plastic 8-Pin MSOP 206C/W 39C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA THERMAL RESISTANCE-JUNCTION TO CASE, JC
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA 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 NAME VOUT PIN # 1 2 DESCRIPTION Regulated Output Voltage. It is recommended to bypass VOUT with a low ESR capacitor (> 2F) 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. 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 100 switch. 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). Fixed Version Only. Filter pin for internal voltage reference. Typically a 1nF capacitor is connected from FILT to GND. System Ground. Flying Capacitor Negative Input. 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 > 2F low ESR capacitor placed as close to the pin as possible for best performance. A minimum capacitance value of 0.1F is required. Flying Capacitor Positive Input. Charge Pump Output Voltage. CPO is approximately 1.95(VIN) at low loads. CPO should be bypassed with a low ESR capacitor (>2F).
SHDN
FB FILT GND C
-
3 3 4 5 6 7 8
PACKAGE DATA PACKAGE DATA
VIN C+ CPO
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
SIMPLIFIED BLOCK DIAGRAM
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C1 C+ CCPO 8 C3 C4
CLK TSD SDRG
7
CHARGE PUMP
5
V IN 1.8V to 4.4V
6
OFF ON
2
Power -On Reset SHD RG SD2
550kHz OSC
SD2
1:100 VIN 1.175 Vref LDO RG SHD
V OUT 1 C2 3 FB
LED N+1
GND
4
Figure 1 - LX1882-00 Block Diagram
BLOCK DIAGRAM BLOCK DIAGRAM
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
SIMPLIFIED BLOCK DIAGRAM
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C1 C+ CCPO 8 C3 C4
CLK TSD SDRG
7
CHARGE PUMP
5
VIN 1.8V to 4.4V
6
OFF ON
2
Power -On Reset SHD RG SD2
550kHz OSC
SD2
FILT 1nF
3
LDO VIN 1.175 Vref R2 RG
1:100
1
SHD
VOUT C2
R1
GND
Figure 2 - LX1882-33 Block Diagram
4
BLOCK DIAGRAM BLOCK DIAGRAM
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature 0C TA 70C except where otherwise noted. Test conditions: SHDN =VIN=3V, C1=0.22F, C2 = C3 = C4 = 4.7F Parameter Operating Voltage IVIN Shutdown Current IVIN Operating Current 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 VFB VOUT FOSC RCPO V Symbol VIN LX1882-00 LX1882-33 SHDN =0V IOUT=0mA, Burst Mode Operation FB=1.175V LX1882-00 only; IOUT=1mA LX1882-33; IOUT=1mA TA=25C IOUT > 200A, 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=25C -50 1.15 3.23 480 Test Conditions Min 1.8 2.0 1 250 1.175 3.30 150 550 22 16 10 100 75 350 17 3 40 120 50 0.4 -1 -1 1 LX1882-xx Typ Max 4.4 4.4 5 400 50 1.20 3.37 620 30 20 20 160 120 30 10 Units V A A nA V V ppm kHz mV S mV mV mV V A A
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VOUT(VIN VIN=3V to 4V, IOUT=0mA ) VOUT(IOU IOUT=1mA to 10mA IOUT=1ma to 50mA T) SHDN =0V, Resistance Measured to GND, VIN=1.8V SHDN =0V, Resistance Measured to GND, VIN=4.4V
350 150 1.6 1 1
VOUT Shutdown Resistance
SHDN Input Threshold SHDN Input Current
VIN=1.8V to 4.4V SHDN =VIN SHDN =0V
Note 1: Dropout voltage is defined as the minimum input to output differential required to maintain regulation.
ELECTRICALS ELECTRICALS
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
APPLICATION INFORMATION
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OPERATION
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.
MAXIMUM VOUT AND IOUT CALCULATIONS (CONT'D) 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 with the condition that (IOUT )(RCPO ) < 0.55VIN . Example: VIN(max) = 3V IOUT = 10mA RCPO(max) = 20 Unloaded CPO Voltage (max) = 6V Loaded CPO Voltage = 6V - (10mA)(20) = 5.8V VDROPOUT = 0.075V VOUT(max) = (6V) - (0.2) - (0.075) = 5.73 VOUT < 5.5 and (IOUT)(RCPO) < 0.55VIN, 0.2V < 1.65V 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 2.2 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.
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 VIN 1.8V to 4.4V C4 C1 5 CGND 4 7 C+ 6 VIN VOUT 1 R1 R2 FB 3
OFF ON
LX1882-00
C2
VOUT = 1.175 [1+(R1/R2)]
APPLICATION APPLICATION
Figure 3. LX1882-00; Adjustable Version
The output voltage range is 2.5V to 5.5V. 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.
CPO LOADING
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).
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
APPLICATION INFORMATION (CONTINUED) POWER-ON RESET 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. 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 100 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.
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Temperature Protection
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). 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 (125C). 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.
Current Limit Protection
The LX1882 includes over current protection. When the output load current exceeds typically 60mA, the circuit forces the regulator output to decrease.
APPLICATION APPLICATION
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
EVALUATION BOARD
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Figure 4. LX1882 LED Driver Evaluation Board (Top View)
Figure 5. LX1882 LED Driver Evaluation Board (Bottom View)
Table 1: Input and Output Pin Assignments
Pin Name
VIN VOUT FB CPO
SHDN
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 -".
GND External VCC
Table 2: Switch Position Assignments
Switch Name
VCC EXT VCC BAT
SHDN ENABLE SHDN DISABLE
Functional Description
Use this position when powering the board from an external power supply. 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. Use this position to enable the LX1882. Use this position to disable the LX1882.
EVALUATION BOARD EVALUATION BOARD
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
EVALUATION BOARD (CONTINUED)
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Table 3: Factory Installed Component List for the LX1882 Evaluation Board
Quantity
1 3 4 3 3 1 1 1 4 1 2 9 1
Part Reference
C1 C2 - C4 D1 - 4 J1 - J3 J4 - J6 P2 R1 R2 R3 - R6 R8 S1, S2 TP1 - TP9 U1
Description
Capacitor, Ceramic, 0.22uF, 16V, 10%, 0805 Type SMT Capacitor, Ceramic X5R, 4.7uF, 25V, 1210 Type SMT White LED Terminal Battery Clip, Positive Button, AA Contacts Terminal Battery Clip, Negative Button, AA Contacts Header, 2-Pin Resistor, 46.4K, 1/10W,1%, 0805 Type SMT Resistor, 14.3K, 1/10W,1%, 0805 Type SMT Resistor, 30.1, 1/10W,1%, 0805 Type SMT Resistor, 10.0K, 1/10W,1%, 0805 Type SMT Switch, SPDT, 1 position, SMT DIP Type Terminal, Surface Mount, Compact Style Test Point IC, LX1882 Charge Pump Doubler with Linear Regulator
Manufacturer
Panasonic Taiyo Yuden Chicago Miniature Keystone Keystone Molex Panasonic Panasonic Panasonic Panasonic CTS Keystone Microsemi
Part Number
ECJ2VB1C224K CETMK325BJ475MN CMD333UWC 596 590 42375-2 ERJ6EKF4642 ERJ6EKF1432 ERJ6EKF30R1 ERJ6EKF1002 204-121ST 5016 LX1882-00CDM
R8 10.0k J1 "AA" Battery
ENABLE
DISABLE
S2
SHDN VOUT
R1 46.4K C2 4.7F 25V R2 14.3k D1 D2 D3 D4
CPO
CPO J2 VOUT SHDN FB GND
"AA" Battery
C3 4.7F 25V C1 0.22F 16V S1 C4 0.1F 25V
C+ VIN C-
J3 "AA" Battery
VBAT EXT
VFB
VSET ILED
R3 30.1 R4 30.1 R5 30.1 R6 30.1
GND VIN GND GND GND
VOUT = VFB[1+(R1/R2) - VSET(R1/R2); where VSET = ILED(R3), VFB = 1.175V
FB
+ External VCC -
EVALUATION BOARD EVALUATION BOARD
Figure 6 - LX1882-00 Evaluation Board Schematic; LED Driver Application
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES
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23 21 19 CPO RESISTANCE (Ohms) 17 15 13 11 9 7 5 2 2.25 2.5 2.75 3 3.25 VIN (V) 3.5 3.75 4 4.25 4.5
3.35 LX2.5V 3.34 3.33 3.32 VOUT VOLTAGE (V) 3.31 3.30 3.29 3.28 3.27 3.26 3.25 0 5 10 15 20 25 30 35 OUTPUT LOAD CURRENT (mA) 40 45 50 LX3.0V LX3.5V LX4.0V LX4.5V
Figure 7 - CPO Output Resistance vs. Input Voltage; TA = 25C, C1 = 0.22F, C2, C3, C4 = 4.7F, CFILT = 0.1F
Figure 8 - LX1882-33 Output Voltage vs. Load Current; TA = 25C, C1 = 0.22F, C2, C3, C4 = 4.7F, CFILT = 0.1F
3.38 3.36 3.34
VOUT VOLTAGE (V)
1.185 1.180 1.175 1.170 1.165 1.160 1.155 1.150 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125
VIN=2.0V VIN=4.4V
3.32 3.30 3.28 3.26 3.24 3.22 3.20
TEMPERATURE ('C) VIN=2.0V VIN=4.4V
VOUT VOLTAGE (V)
CHARTS
TEMPERATURE ('C)
Figure 9 - LX1882-33 Output Voltage vs. Temperature; C1 = 0.22F, C2, C3, C4 = 4.7F, CFILT = 0.1F
Figure 10 - LX1882-00 Output Voltage vs. Temperature; C1 = 0.22F, C2, C3, C4 = 4.7F
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES
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9
10 9
8
8 CPO VOLTAGE (V) CPO VOLTAGE (V)
7
7 6 5 4 3 2
LX2.0V LX3.0V LX4.0V LX2.5V LX3.5V LX4.5V
6
LX00mA LX01mA
5
LX10mA LX25mA
4
LX50mA
3 2.00 2.25 2.50 2.75 3.00 3.25
VIN (V)
3.50
3.75
4.00
4.25
4.50
1 0 5 10 15 20 25 30 35 40 45 50 OUTPUT LOAD CURRENT (mA)
Figure 11 - CPO Voltage vs. Input Voltage; TA = 25C, C1 = 0.22F, C2, C3, C4 = 4.7F, CFILT = 0.1F
Figure 12 - CPO Voltage vs. Load Current; TA = 25C, C1 = 0.22F, C2, C3, C4 = 4.7F, CFILT = 0.1F
120
VOUT SHDN RESISTANCE - ( Ohms )
90% 80%
110
70%
EFFICIENCY - (%)
100 90 80 70 60 50 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE ( V )
60% 50% 40% 30% 20%
2.0V 2.5V 4.0V 3.0V 4.5V
10% 0% 0 5 10 15 20
3.5V
CHARTS CHARTS
25
30
35
40
45
50
OUTPUT LOAD CURRENT - (mA)
Figure 13 - VOUT Shutdown Resistance vs. Input Voltage; TA = 25C, C1 = 0.22F, C2, C3, C4 = 4.7F, CFILT = 0.1F
Figure 14 - Efficiency vs. Output Current; TA = 25C, C1 = 0.22F, C2, C3, C4 = 4.7F, CFILT = 0.1F
Copyright 2000 Rev. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
MECHANICAL DRAWING
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DU
8-Pin MSOP
A
Dim A B C D G H J K L M N P
B
H
G P C N D L K M
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
DM
8-Pin Plastic SOIC
Dim A B C D F G J K L M P *LC 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
A
P
B G C D K J F L M
MECHANICALS MECHANICALS
*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. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 12
LX1882
INTEGRATED PRODUCTS
Charge Pump Doubler with Linear Regulator
PRODUCTION DATA SHEET
NOTES
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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. 1.0c, 2002-08-01
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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