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CAT3200, CAT3200-5 Low Noise Regulated Charge Pump DC-DC Converter
Description
The CAT3200 and CAT3200-5 are switched capacitor boost converters that deliver a low noise, regulated output voltage. The CAT3200-5 gives a fixed regulated 5 V output. The CAT3200 has an adjustable output using external resistors. The constant frequency 2 MHz charge pump allows small 1 mF ceramic capacitors to be used. Maximum output loads of up to 100 mA can be supported over a wide range of input supply voltages (2.7 V to 4.5 V) making the device ideal for battery-powered applications. A shutdown control input allows the device to be placed in power-down mode, reducing the supply current to less than 1 mA. In the event of short circuit or overload conditions, the device is fully protected by both foldback current limiting and thermal overload detection. In addition, a soft start, slew rate control circuit limits inrush current during power-up. The CAT3200-5 is available in a 6-lead, 1 mm max thin SOT23 package. The CAT3200 is available in an 8-lead MSOP package.
Features
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1 MSOP-8 Z SUFFIX CASE 846AD
1 TSOT-23 TD SUFFIX CASE 419AF
PIN CONFIGURATIONS
CAT3200 MSOP CPOS IN CNEG PGND 1 OUT FB SHDN SGND CAT3200-5 SOT23 1 OUT GND SHDN (Top Views) CPOS IN CNEG
* Constant High Frequency (2 MHz) Operation * 100 mA Output Current * Regulated Output Voltage (5 V Fixed CAT3200-5, Adjustable * * * * * * * * * *
CAT3200) Low Quiescent Current (1.7 mA Typ.) Input Voltage Operation down to 2.7 V Soft Start, Slew Rate Control Thermal Overload Shutdown Protection Low Value External Capacitors (1 mF) Foldback Current Overload Protection Shutdown Current less than 1 mA CAT3200-5 in Low Profile (1 mm Thin) 6-lead TSOT-23 Package CAT3200 in MSOP-8 Package These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant 3 V to 5 V Boost Conversion White LED Driver USB On-The-Go 5 V Supply Local 5 V Supply from Lower Rail Battery Backup Systems Handheld Portable Devices
ORDERING INFORMATION
Device CAT3200TDI-T3 CAT3200TDI-GT3 CAT3200ZI-T3 CAT3200ZI-GT3 * NiPdAu lead finish Package TSOT23-6 (Pb-Free) TSOT23-6* (Pb-Free) MSOP-8 (Pb-Free) MSOP-8* (Pb-Free) Shipping 3,000 / Tape & Reel 3,000 / Tape & Reel 3,000 / Tape & Reel 3,000 / Tape & Reel
Applications
* * * * * *
(c) Semiconductor Components Industries, LLC, 2010
May, 2010 - Rev. 13
1
Publication Order Number: CAT3200/D
CAT3200, CAT3200-5
MARKING DIAGRAMS
ABME = CAT3200ZI-T3 ABRU = CAT3200ZI-GT3 LN = CAT3200TDI-T3 VA = CAT3200TDI-GT3 Y = Production Year (Last Digit) M = Production Month (1-9, A, B, C) R = Production Revision
ABME YMR
ABRU YMR
LNYM
VAYM
Typical Application
1 mF VIN ON OFF 1 mF CNEG IN CPOS OUT 5V VOUT VIN 1 mF CNEG IN OFF CPOS OUT R1 FB GND 1 mF R2 VOUT 100 mA
CAT3200-5 + 3.3 V - SHDN GND
100 mA + 1 mF 3.3 V - ON 1 mF
CAT3200 SHDN
VOUT = 5 V IOUT 50 mA, for VIN 2.8 V IOUT 90 mA, for VIN 3 V
V OUT + 1.27 V
R 1) 1 R2
Figure 1. Typical Application - 5 V Output Table 1. PIN DESCRIPTIONS
Designation OUT GND SHDN CNEG IN CPOS FB PGND SGND Regulated output voltage. Ground reference for all voltages.
Figure 2. Typical Application - Adjustable Output
Description
Shutdown control logic input (Active LOW) Negative connection for the flying capacitor. Input power supply. Positive connection for the flying capacitor. Feedback to set the output voltage. Power ground. Signal ground.
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameters VIN, VOUT, SHDN, CNEG, CPOS Voltage VOUT Short Circuit Duration Output Current ESD Protection (HBM) Junction Temperature Storage Temperature Range Lead Soldering Temperature (10 sec) Power Dissipation (SOT23-6) Power Dissipation (8-MSOP) Ratings -0.6 to +6.0 Indefinite 200 2000 150 -65 to +160 300 0.3 0.5 mA V C C C W W Units V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
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CAT3200, CAT3200-5
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameters VIN CIN, COUT, CFLY ILOAD Ambient Temperature Range Ratings 2.7 to 4.5 1 0 to 100 -40 to +85 Units V mF mA C
Table 4. ELECTRICAL SPECIFICATIONS
Symbol VOUT VLINE VLOAD FOSC VR h IGND ISHDN VFB IFB ROL TON VIHSHDN VILSHDN IROUT ISC TSD THYST Parameter Regulated Output Line Regulation Load Regulation Switching Frequency Output Ripple Voltage Efficiency Ground Current Shutdown Input Current FB Voltage FB Input Current Open-Loop Resistance
(Recommended operating conditions unless otherwise specified. CIN, COUT, CFLY are 1 mF ceramic capacitors and VIN is set to 3.6 V.) Conditions ILOAD 40 mA, VIN 2.7 V ILOAD 100 mA, VIN 3.1 V 3.1 V VIN 4.5 V, ILOAD = 50 mA ILOAD = 10 mA to 100 mA, VIN = 3.6 V 1.3 ILOAD = 100 mA CAT3200-5 Only ILOAD = 50 mA, VIN = 3 V, CAT3200-5 ILOAD = 0 mA, SHDN = VIN ILOAD = 0 mA, SHDN = 0 V to VIN CAT3200 Only CAT3200 Only ILOAD = 100 mA, VIN = 3 V (Note 1) ILOAD = 0 mA, VIN = 3 V 0.4 VOUT = 5 V, Shutdown mode (Note 2) VOUT = 0 V 15 80 160 20 30 1.22 -50 10 0.5 0.8 1.3 1.27 Min 4.8 Typ 5.0 6 20 2.0 30 80 1.6 4 1 1.32 50 2.6 Max 5.2 Units V mV mV MHz mVp-p % mA mA V nA W ms V V mA mA C C
VOUT Turn-on time (10% to 90%) High Detect Shutdown Threshold Low Detect Shutdown Threshold Reverse Leakage into OUT pin Short-circuit Output Thermal Shutdown Thermal Hysteresis
1. ROL = (2VIN - VOUT)/IOUT 2. In the event of a controlled shutdown, the output will be isolated from the input, but will remain connected to the internal resistor feedback network. This will cause a small level of reverse current to flow back into the device to ground.
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CAT3200, CAT3200-5
TYPICAL PERFORMANCE CHARACTERISTICS (CAT3200-5)
(TAMB = 25C, CIN = COUT = CFLY = 1 mF, VIN = 3.3 V unless specified otherwise.) 1.2 SHUTDOWN THRESHOLD (V) 1.1 GROUND CURRENT (mA) 2.7 3.0 3.3 3.6 3.9 4.2 4.5 1.0 0.9 0.8 0.7 0.6 0.5 0.4 1.2 2.7 3.0 3.3 3.6 3.9 4.2 4.5 2.0 1.8 1.6 1.4 2.2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 3. Shutdown Input Threshold vs. Supply Voltage
5.2 5.2
Figure 4. Ground Current vs. Supply Voltage (No Load)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
5.1 20 mA Load 100 mA Load 4.9
5.1
5.0
5.0
VIN = 3.2 V
4.9 VIN = 2.7 V 0 50
VIN = 3.0 V
4.8
2.7
3.0
3.3
3.6
3.9
4.2
4.5
4.8
100
150
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
Figure 5. Line Regulation
2.6 OSCILLATOR FREQUENCY (MHz) 2.4 2.2 2.0 1.8 1.6 EFFICIENCY (%) 100 90 80 70 60 50 40 2.7 3.0 3.3 3.6 3.9 4.2 4.5 30 1
Figure 6. Load Regulation
VIN = 2.7 V VIN = 3.2 V VIN = 3.7 V
VIN = 4.5 V
10 LOAD CURRENT (mA)
100
INPUT VOLTAGE (V)
Figure 7. Oscillator Frequency vs. Supply Voltage
Figure 8. Efficiency vs. Load Current
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CAT3200, CAT3200-5
TYPICAL PERFORMANCE CHARACTERISTICS (CAT3200-5)
(TAMB = 25C, CIN = COUT = CFLY = 1 mF, VIN = 3.3 V unless specified otherwise.)
Figure 9. Soft Start Power Up (90 mA Load, 3.3 V Input)
250 200 150 100 50 0
Figure 10. Load Step Response (3.3 V Input)
CURRENT LIMIT (mA)
2.7
3.0
3.3
3.6
3.9
4.2
4.5
INPUT VOLTAGE (V)
Figure 11. Output Ripple (100 mA Load, 3.3 V Input)
2 OUTPUT VOLTAGE CHANGE (%) FREQUENCY CHANGE (%) 4
Figure 12. Short Circuit Current vs. Supply Voltage
1 10 mA Load 0
2
0
-1
-2
-2 -40
-20
0
20
40
60
80
100
-4 -40
-20
0
20
40
60
80
100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 13. Output Voltage Change vs. Temperature
Figure 14. Oscillator Frequency Change vs. Temperature
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CAT3200, CAT3200-5
Block Diagram
CNEG CPOS 2VIN CNEG CPOS 2VIN
IN SHDN
2 MHz Voltage Doubler EN
IN SHDN
2 MHz Voltage Doubler EN
+ 1.25 V -
+ 5 V / 100 mA OUT FB 1.25 V - 100 k GND
5V 300 k 100 mA
OUT
SGND
PGND
Figure 15. CAT3200 Adjustable Output
Figure 16. CAT3200-5 5 V Fixed Output
Pin Functions IN is the power supply. During normal operation the device draws a supply current which is almost constant. A very brief interval of non-conduction will occur at the switching frequency. The duration of the non-conduction interval is set by the internal non-overlapping "break-before-make" timing. IN should be bypassed with a 1 mF to 4.7 mF low ESR (Equivalent Series Resistance) ceramic capacitor For filtering, a low ESR ceramic bypass capacitor (1 mF) in close proximity to the IN pin prevents noise from being injected back into the power supply. SHDN is the logic control input (Active LOW) that places the device into shutdown mode. The internal logic is CMOS and the pin does not use an internal pull-down resistor. The SHDN pin should not be allowed to float. CPOS, CNEG are the positive and negative connections respectively for the charge pump flying capacitor. A low ESR ceramic capacitor (1 mF) should be connected between these pins. During initial power-up it may be possible for the capacitor to experience a voltage reversal and for this reason, avoid using a polarized (tantalum or aluminum) flying capacitor. OUT is the regulated output voltage to power the load. During normal operation, the device will deliver a train of current pulses to the pin at a frequency of 2 MHz. Adequate filtering on the pin can typically be achieved through the use
a low ESR ceramic bypass capacitor (1 mF to 4.7 mF) in close proximity to the OUT pin. The ESR of the output capacitor will directly influence the output ripple voltage. When the shutdown mode is entered, the output is immediately isolated from the input supply, however, the output will remain connected to the internal feedback resistor network (400 kW). The feedback network will result in a reverse current of 10 mA to 20 mA to flow back through the device to ground. Whenever the device is taken out of shutdown mode, the output voltage will experience a slew rate controlled power-up. Full operating voltage is typically achieved in less than 0.5 msec. GND is the ground reference for all voltages on CAT3200-5 devices. FB (CAT3200 Only) is the feedback input pin. An output divider should be connected from OUT to FB to program the output voltage. PGND (CAT3200 Only). Is the same as GND for the CAT3200-5 except for the internal reference connection to SGND. SGND (CAT3200 Only) Ground pin for the internal reference. The CNEG connection is switched to this pin during the normal charge pump operation.
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CAT3200, CAT3200-5
Device Operation The CAT3200/CAT3200-5 use a switched capacitor charge pump to boost the voltage at IN to a regulated output voltage. Regulation is achieved by sensing the output voltage through an internal resistor divider (CAT3200-5) and modulating the charge pump output current based on the error signal. A 2-phase non-overlapping clock activates the charge pump switches. The flying capacitor is charged from the IN voltage on the first phase of the clock. On the second phase of the clock it is stacked in series with the input voltage and connected to OUT. The charging and discharging the flying capacitor continues at a free running frequency of typically 2 MHz. In shutdown mode all circuitry is turned off and the CAT3200/CAT3200-5 draw only leakage current from the VIN supply. OUT is disconnected from IN. The SHDN pin is a CMOS input with a threshold voltage of approximately 0.8 V. The CAT3200/CAT3200-5 is in shutdown when a logic LOW is applied to the SHDN pin. The SHDN pin is a high impedance CMOS input. SHDN does not have an internal pull-down resistor and should not be allowed to float and. It must always be driven with a valid logic level.
Short-Circuit and Thermal Protection
The CAT3200 and CAT3200-5 will cycle in and out of thermal shutdown indefinitely without latch-up or damage until a short-circuit on OUT is removed.
Programming the CAT3200 Output Voltage (FB Pin)
The CAT3200-5 version has an internal resistive divider to program the output voltage. The programmable CAT3200 may be set to an arbitrary voltage via an external resistive divider. Since it employs a voltage doubling charge pump, it is not possible to achieve output voltages greater than twice the available input voltage. Figure 17 shows the required voltage divider connection. The voltage divider ratio is given by the formula:
R1 + V OUT * 1 R2 1.27 V
Typical values for total voltage divider resistance can range from several kWs up to 1 MW.
1 CPOS 2 IN 3 CNEG OUT 8 R1 R2 VOUT 1.27 V COUT 1 ) R1 R2
The CAT3200 and CAT3200-5 have built-in short-circuit current limiting and over temperature protection. During overload conditions, output current is limited to approximately 225 mA. At higher temperatures, or if the input voltage is high enough to cause excessive chip self heating, the thermal shutdown circuit shuts down the charge pump as the junction temperature exceeds approximately 160C. Once the junction temperature drops back to approximately 140C, the charge pump is enabled.
FB PGND 6 SHDN SGND
7 4 5
Figure 17. Programming the Adjustable CAT3200
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CAT3200, CAT3200-5
Application Information
Ceramic Capacitors Thermal Management
Ceramic capacitors of different dielectric materials lose their capacitance with higher temperature and voltage at different rates. For example, a capacitor made of X5R or X7R material will retain most of its capacitance from - 40C to 85C whereas a Z5U or Y5V style capacitor will lose considerable capacitance over that range. Z5U and Y5V capacitors may also have voltage coefficient causing them to lose 60% or more of their capacitance when the rated voltage is applied. When comparing different capacitors it is often useful consider the amount of achievable capacitance for a given case size rather than discussing the specified capacitance value. For example, over rated voltage and temperature conditions, a 1 mF, 10 V, Y5V ceramic capacitor in an 0603 case may not provide any more capacitance than a 0.22 mF, 10 V, X7R available in the same 0603 case. For many CAT3200/ CAT3200-5 applications these capacitors can be considered roughly equivalent. The capacitor manufacturer's data sheet should be consulted to determine what value of capacitor is needed to ensure the desired capacitance at all temperatures and voltages. Below is a list of ceramic capacitor manufacturers and how to contact them:
Table 5. CERAMIC CAPACITOR MANUFACTURERS
Capacitor Manufacturer Murata AVX/Kemet Vishay Kemet Taiyo Yuden Web www.murata.com www.avxcorp.com www.vishay.com www.kemet.com www.t-yuden.com 408.986.0424 408.573.4150 Phone 814.237.1431 843.448.9411
For higher input voltages and maximum output current there can be substantial power dissipation in the CAT3200/ CAT3200-5. If the junction temperature increases to 160C, the thermal shutdown circuitry will automatically turn off the output. A good thermal connection to the PC board is recommended to reduce the chip temperature. Connecting the GND pin (Pins 4/5 for CAT3200, Pin 2 for CAT3200-5) to a ground plane, and maintaining a solid ground plane under the device reduces the overall thermal resistance. The overall junction to ambient thermal resistance (qJA) for device power dissipation (PD) consists primarily of two paths in series. The first path is the junction to the case (qJC) which is defined by the package style, and the second path is case to ambient (qCA) thermal resistance which is dependent on board layout. The final operating junction temperature for any set of conditions can be estimated by the following thermal equation: TJUNC = TAMB + PD (QJC) + PD (QCA) TJUNC = TAMB + PD (QJA) The CAT3200 in SOT23 package, when mounted on printed circuit board with two square inches of copper allocated for "heat spreading", will result with an overall JA of less than 150C/W. For a typical application operating from a 3.8 V input supply, the maximum power dissipation is 260 mW (100 mA x 3 V). This would result if a maximum junction temperature of: TJUNC = TAMB + PD (qJA) TJUNC = 85C + 0.26 W (150C/W) TJUNC = 85C + 39C = 124C The use of multi-layer board construction with power planes will further enhance the overall thermal performance. In the event of no dedicated copper area being used for heat spreading, a multi-layer board will typically provide the CAT3200 with an overall qJA of 200C/W. This level of thermal conduction would allow up to 200 mW be safely dissipated within the device.
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CAT3200, CAT3200-5
Typical Applications
1 mF 4 5 IN 3.3 V 10% 3 1 mF SHDN CAT3200-5 GND 2 1 mF VOUT 5 V 4% 100 mA 3 1 mF 6 OUT 1 4 5 IN 1 mF 6 OUT 1
4 V VIN 5 V
SHDN CAT3200-5 GND 2
1 mF
VOUT 5 V 4%
Figure 18. 3.3 V Supply to 5 V
Figure 19. USB Port to Regulated 5 V Power Supply
1 mF
4 5 3 V to 4.4 V Li-ion Battery + 1 mF C- IN
6 C+ OUT 1 1 mF 100 Drive up to 5 LEDs 100 100 100 100
CAT3200-5
ON
OFF
3
SHDN
SGND
2
Apply PWM Waveform for Adjustable Brightness Control
VSHDN
t
Figure 20. Lithium-Ion Battery to 5 V White or Blue LED Driver
1 mF
1 2 3 V to 4.4 V Li-ion Battery + 1 mF C+ IN
3 C- OUT 8 7 5 4 82 82 82 82 82 1 mF Up to 6 LEDs
CAT3200
FB
PGND ON OFF 6 SHDN SGND
Apply PWM Waveform for Adjustable Brightness Control
VSHDN
t
Figure 21. White or Blue LED Driver with LED Current Control
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CAT3200, CAT3200-5
PACKAGE DIMENSIONS
TSOT-23, 6 LEAD CASE 419AF-01 ISSUE O SYMBOL
A A1 A2 b c D E1 E E E1 e L L1 L2 0.30 0.01 0.80 0.30 0.12 0.15 2.90 BSC 2.80 BSC 1.60 BSC 0.95 TYP 0.40 0.60 REF 0.25 BSC 0.50 0.05 0.87
D e
MIN
NOM
MAX
1.00 0.10 0.90 0.45 0.20
TOP VIEW
0
8
A2 A
q
b
A1 L1
L
c
L2
SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-193.
END VIEW
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CAT3200, CAT3200-5
PACKAGE DIMENSIONS
MSOP 8, 3x3 CASE 846AD-01 ISSUE O
SYMBOL A A1 A2 b c E E1 D E E1 e L L1 L2
MIN
NOM
MAX 1.10
0.05 0.75 0.22 0.13 2.90 4.80 2.90 0.40
0.10 0.85
0.15 0.95 0.38 0.23
3.00 4.90 3.00 0.65 BSC 0.60 0.95 REF 0.25 BSC
3.10 5.00 3.10 0.80
0
6
TOP VIEW
D
A
A2
DETAIL A
A1
e SIDE VIEW
b
c END VIEW
q L2 Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187. L L1 DETAIL A
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CAT3200, CAT3200-5
Example of Ordering Information (Note 5)
Prefix CAT Device # 3200 Suffix TD I -G T3
Company ID (Optional) Product Number 3200
Temperature Range I = Industrial (-40C to +85C)
Lead Finish G: NiPdAu Blank: Matte-Tin (Note 6)
Tape & Reel (Note 7) T: Tape & Reel 3: 3,000 Units / Reel
Package TD: TSOT-23 Z: MSOP 3. 4. 5. 6. 7. All packages are RoHS-compliant (Lead-free, Halogen-free). The standard lead finish is NiPdAu. The device used in the above example is a CAT3200TDI-GT3 (TSOT-23, Industrial Temperature, NiPdAu, Tape & Reel, 3,000/Reel). For Matte-Tin package option, please contact your nearest ON Semiconductor Sales office. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
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CAT3200/D

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