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Micropower Step-Up/Step-Down Fixed 3.3 V, 5 V, 12 V, Adjustable High Frequency Switching Regulator
ADP3000
FEATURES
Operates at supply voltages from 2 V to 30 V Works in step-up or step-down mode Very few external components required High frequency operation up to 400 kHz Low battery detector on-chip User-adjustable current limit Fixed and adjustable output voltage 8-lead PDIP, 8-lead SOIC, and 14-lead TSSOP packages Small inductors and capacitors
FUNCTIONAL BLOCK DIAGRAMS
SET
VIN
A1 GAIN BLOCK/ ERROR AMP 1.245V REFERENCE 400kHz OSCILLATOR COMPARATOR DRIVER
A0 ILIM SW1
SW2
R1 GND
R2 SENSE
APPLICATIONS
Notebook, palmtop computers Cellular telephones Hard disk drives Portable instruments Pagers
Figure 1.
VIN 2V TO 3.2V
6.8H 100F 10V
1
IN5817
3.3V 180mA
120V
2
ILIM
VIN SW1 3
GENERAL DESCRIPTION
The ADP3000 is a versatile step-up/step-down switching regulator. It operates from an input supply voltage of 2 V to 12 V in step-up mode, and from 2 V to 30 V in step-down mode. Operating in pulse frequency mode (PFM), the device consumes only 500 A, making it ideal for applications requiring low quiescent current. It delivers an output current of 180 mA at 3.3 V from a 2 V input in step-up mode, and an output current of 100 mA at 3 V from a 5 V input in step-down mode. The ADP3000 operates at 400 kHz switching frequency. This allows the use of small external components (inductors and capacitors), making it convenient for space-constrained designs. The auxiliary gain amplifier can be used as a low battery detector, linear regulator, undervoltage lockout, or error amplifier.
VIN 5V TO 6V C1 100F 10V
ADP3000-3.3V
FB 8 (SENSE) GND
5
+
C1 100F 10V
SW2
4
00122-002
00122-003
C1, C2 = AVX TPS D107 M010R0100 L1 = SUMIDA CR43-6R8
Figure 2. Typical Application
RLIM 120
1 2 3
ILIM
VIN SW1 FB 8
ADP3000
SW2 4 GND
5
L1 10H CL + 100F 10V
R2 150k 1% R1 110k 1%
VOUT 3V 100mA
D1 1N5818 C1, C2 = AVX TPS D107 M010R0100 L1 = SUMIDA CR43-100
Figure 3. Step-Down Mode Operation
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved.
00122-001
ADP3000
ADP3000 TABLE OF CONTENTS
Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configurations and Function Descriptions ........................... 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ........................................................................ 9 Applications Information .............................................................. 10 Component Selection................................................................. 10 Programming the Switching Current Limit............................ 10 Programming the Gain Block................................................... 11 Power Transistor Protection Diode in Step-Down Configuration ............................................................................. 11 Thermal Considerations............................................................ 11 Typical Application Circuits ......................................................... 13 Outline Dimensions ....................................................................... 15 Ordering Guide .......................................................................... 16
REVISION HISTORY
9/04--Data Sheet Changed from Rev. 0 to Rev. A Added RU-14 Package ................................................. Universal Changes to Table 4.....................................................................10 Changes to Table 5.....................................................................10 Updated Outline Dimensions ..................................................15 Changes to Ordering Guide .....................................................16
1/97--Revision 0: Initial Version
Rev. A | Page 2 of 16
ADP3000 SPECIFICATIONS
0C TA +70C, VIN = 3 V, unless otherwise noted.1 Table 1.
Parameter INPUT VOLTAGE SHUT-DOWN QUIESCENT CURRENT COMPARATOR TRIP POINT VOLTAGE OUTPUT SENSE VOLTAGE Conditions Step-up mode Step-down mode VFB > 1.43 V; VSENSE > 1.1 x VOUT ADP30002 ADP3000-3.33 ADP3000-53 ADP3000-123 ADP3000 ADP3000-3.3 ADP3000-5 ADP3000-12 VFB < VREF ILIM tied to VIN, VFB= 0 TA = +25C VIN = 3.0 V, ISW = 650 mA VIN = 5.0 V, ISW = 1 A VIN = 12 V, ISW = 650 mA ADP3000 VFB = 0 V VSET = VREF ISINK = 300 A, VSET = 1.00 V 5 V VIN 30 V 2 V VIN 5 V RL = 100 k4 VSET 1 V 220 from ILIM to VIN Measured at SW1 pin VSW1= 12 V, TA = +25C TA = +25C ISW1 10 A, switch off Symbol VIN IQ VOUT 1.20 3.135 4.75 11.40 Min 2.0 ADP3000 Typ Max 12.6 30.0 500 1.245 1.30 3.3 3.465 5.00 5.25 12.00 12.60 8 12.5 32 50 32 50 75 120 400 450 80 2 2.55 0.75 0.8 1.1 160 200 0.15 0.02 0.2 6000 300 400 -0.3 1 10 V 1.1 1.5 330 400 0.4 0.15 0.6 Unit V V A V V V V mV mV mV mV kHz % s
COMPARATOR HYSTERESIS OUTPUT HYSTERESIS
OSCILLATOR FREQUENCY DUTY CYCLE SWITCH-ON TIME SWITCH SATURATION VOLTAGE Step-Up Mode Step-Down Mode FEEDBACK PIN BIAS CURRENT SET PIN BIAS CURRENT GAIN BLOCK OUTPUT LOW REFERENCE LINE REGULATION GAIN BLOCK GAIN GAIN BLOCK CURRENT SINK CURRENT LIMIT CURRENT LIMIT TEMPERATURE COEFFICIENT SWITCH-OFF LEAKAGE CURRENT MAXIMUM EXCURSION BELOW GND
fOSC D tON VSAT
350 65 1.5 0.5
IFB ISET VOL
V V nA nA V %/V %/V V/V A mA %/C A
AV ISINK ILIM
1000
-400
-350
mV
1 2 3
All limits at temperature extremes are guaranteed via correlation using standard statistical methods. This specification guarantees that both the high and low trip points of the comparator fall within the 1.20 V to 1.30 V range. The output voltage waveform will exhibit a saw-tooth shape due to the comparator hysteresis. The output voltage on the fixed output versions will always be within the specified range. 4 100 k resistor connected between a 5 V source and the AO pin.
Rev. A | Page 3 of 16
ADP3000 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Input Supply Voltage, Step-Up Mode Input Supply Voltage, Step-Down Mode SW1 Pin Voltage SW2 Pin Voltage Feedback Pin Voltage (ADP3000) Switch Current Maximum Power Dissipation Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 s) Thermal Impedance R-8 RU-14 N-8 Rating 15 V 36 V 50 V -0.5 V to VIN 5.5 V 1.5 A 500 mW 0C to +70C -65C to +150C 300C 170C/W 150C/W 120C/W
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. A | Page 4 of 16
ADP3000 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
ILIM 1 VIN 2 SW1 3 SW2 4
ILIM 1
8
8
FB (SENSE)* SET
FB (SENSE)* SET
00122-004
ADP3000
VIN 2 SW1 3
7
ADP3000
7
*FIXED VERSIONS
*FIXED VERSIONS
Figure 4. 8-Lead Plastic DIP (N-8)
Figure 6. 8-Lead SOIC (R-8)
NC NC ILIM VIN SW1 NC SW2
1 2 3 4 5 6 7
14 13 12
NC FB SET AO NC NC
00122-035
ADP3000
TOP VIEW (Not to Scale)
11 10 9 8
GND
NC = NO CONNECT
Figure 5. 14-lead TSSOP (RU-14)
Table 3. Pin Function Descriptions
Mnemonic ILIM VIN SW1 SW2 GND AO SET FB/SENSE Function For normal conditions, connect to VIN. When lower current is required, connect a resistor between ILIM and VIN. To limit the switch current to 400 mA, connect a 220 resistor. Input Voltage. Collector of Power Transistor. For step-down configuration, connect to VIN. For step-up configuration, connect to an inductor/diode. Emitter of Power Transistor. For step-down configuration, connect to inductor/diode. For step-up configuration, connect to ground. Do not allow pin to go more than a diode drop below ground. Ground. Auxiliary Gain Block (GB) Output. Open collector can sink 300 A. This pin can be left open if not used. Auxiliary Gain Amplifier Input. The amplifier's positive input is connected to the SET pin, and its negative input is connected to the 1.245 V reference. This pin can be left open if not used. On the ADP3000 (adjustable) version, this pin is connected to the comparator input. On the ADP3000-3.3, the ADP3000-5, and the ADP3000-12, the pin goes directly to the internal resistor divider that sets the output voltage.
SET
SET
VIN
A2 GAIN BLOCK/ ERROR AMP 1.245V REFERENCE
A0 ILIM SW1
00122-005
TOP VIEW 6 AO (Not to Scale) 5 GND
6 AO TOP VIEW SW2 4 (Not to Scale) 5 GND
VIN
A1 GAIN BLOCK/ ERROR AMP 1.245V REFERENCE
A0 ILIM SW1
A1
OSCILLATOR DRIVER SW2
OSCILLATOR COMPARATOR DRIVER SW2
COMPARATOR
00122-006
R1 GND
R2 SENSE
GND
FB
Figure 7. Functional Block Diagram for Adjustable Version
Figure 8. Functional Block Diagram for Fixed Version
Rev. A | Page 5 of 16
00122-007
ADP3000
ADP3000
ADP3000 TYPICAL PERFORMANCE CHARACTERISTICS
2.5 406 405 OSCILLATOR FREQUENCY @ TA = 25C
OSCILLATOR FREQUENCY (kHz)
00122-008
2.0
404 403 402 401 400 399
00122-011 00122-013 00122-A-012
ON VOLTAGE (V)
1.5 VIN = 5V @ TA = 25C 1.0
0.5
VIN = 3V @ TA = 25C VIN = 2V @ TA = 25C
0 0.1
398 2 4 6 8 10 12 15 18 INPUT VOLTAGE (V) 21 24 27 30
0.2
0.4
0.6 0.8 1.0 SWITCH CURRENT (A)
1.2
1.4
1.5
Figure 9. Switch-On Voltage vs. Switch Current in Step-Up Mode
1.4 1.2 1.0 VIN = 5V @ TA = 25C
Figure 12. Oscillator Frequency vs. Input Voltage
0.8 0.7 0.6 TA = 25C
VIN = 5V
TA = 0C
SWITCH CURRENT (A)
VCE(SAT) (V)
0.8 0.6 0.4 0.2 0 0.1
VIN = 12V @ TA = 25C
0.5 TA = 85C 0.4 0.3 0.2 0.1
00122-009
0 1 10 RLIM () 100 1k
0.2
0.3
0.4 0.5 0.6 SWITCH CURRENT (A)
0.8
0.9
Figure 10. Saturation Voltage vs. Switch Current in Step-Down Mode
Figure 13. Maximum Switch Current vs. RLIM in Step-Down Mode (5 V)
1400 1200
1.8 1.6
QUIESCENT CURRENT @ TA = 25C
VIN = 12V
TA = 25C TA = 0C
1.4
QUIESCENT CURRENT (A)
SWITCH CURRENT (A)
1000 800 600 400 200 0 1.5
1.2 1.0 0.8 0.6 0.4 0.2 TA = 85C
00122-010
0 1 10 RLIM () 100 1k
3.0
6
9
12 15 18 21 INPUT VOLTAGE (V)
24
27
30
Figure 11. Quiescent Current vs. Input Voltage
Figure 14. Maximum Switch Current vs. RLIM in Step-Down Mode (12 V)
Rev. A | Page 6 of 16
ADP3000
1.8 1.6 1.4 VIN = 3V 100 90 80 TA = 0C TA = 25C 1.0 0.8 0.6 0.4 0.2
00122-014
SWITCH CURRENT (A)
DUTY CYCLE (%)
1.2
70 60 50 40 30 20 10
TA = 85C
1
10 RLIM ()
100
1k
0
25 TEMPERATURE (C(T A))
70
85
Figure 15. Maximum Switch Current vs. RLIM in Step-Up Mode (3 V)
440 430 0.54 0.56
Figure 18. Duty Cycle vs. Temperature
OSCILLATOR FREQUENCY (kHz)
420 410 400 390 380 370 360 350 340
00122-015
SATURATION VOLTAGE (V)
0.52 0.50 VIN = 3V @ ISW = 0.65A 0.48 0.46 0.44
0
25 TEMPERATURE (C(T A))
70
85
0
25 TEMPERATURE (C(T A))
70
85
Figure 16. Oscillator Frequency vs. Temperature
Figure 19. Saturation Voltage vs. Temperature in Step-Up Mode
2.30 2.25
1.25 1.20
2.20 2.15 1.15
ON VOLTAGE (V)
ON TIME (s)
2.10 2.05 2.00 1.95 1.90
VIN = 12V @ ISW = 0.65A 1.10 1.05 1.00 0.95
1.85
00122-016
0
25 TEMPERATURE (C(T A))
70
85
0
25 TEMPERATURE (C(T A))
70
85
Figure 17. Switch-On Time vs. Temperature
Figure 20. Switch-On Voltage vs. Temperature in Step-Down Mode
Rev. A | Page 7 of 16
00122-019
1.80 -40
0.90 -40
00122-018
330 -40
0.42 -40
00122-017
0
0 -40
ADP3000
250 350 300 200 250
BIAS CURRENT (nA)
150
BIAS CURRENT (nA)
00122-020
200 150 100 50
100
50
0
25 TEMPERATURE (C(T A))
70
85
0
25 TEMPERATURE (C(T A))
70
85
Figure 21. Feedback Bias Current vs. Temperature
Figure 23. Set Pin Bias Current vs. Temperature
700 VIN = 20V 600
QUIESCENT CURRENT (A)
500 400 300 200 100 0 -40
0
25 TEMPERATURE (C(T A))
70
85
Figure 22. Quiescent Current vs. Temperature
00122-021
Rev. A | Page 8 of 16
00122-022
0 -40
0 -40
ADP3000 THEORY OF OPERATION
The ADP3000 is a versatile, high frequency, switch mode power supply (SMPS) controller. The regulated output voltage can be greater than the input voltage (in boost or step-up mode) or less than the input voltage (in buck or step-down mode). This device uses a gated oscillator technique to provide high performance with low quiescent current. Figure 7 is a functional block diagram of the ADP3000. The internal 1.245 V reference is connected to one input of the comparator, and the other input is externally connected (via the FB pin) to a resistor divider, which is connected to the regulated output. When the voltage at the FB pin falls below 1.245 V, the 400 kHz oscillator turns on. The ADP3000 internal oscillator typically provides a 1.7 s on time and a 0.8 s off time. A driver amplifier provides base drive to the internal power switch, and the switching action raises the output voltage. When the voltage at the FB pin exceeds 1.245 V, the oscillator shuts off. While the oscillator is off, the ADP3000 quiescent current is only 500 A. The comparator's hysteresis ensures loop stability without requiring external components for frequency compensation. The maximum current in the internal power switch is set by connecting a resistor between VIN and the ILIM pin. When the maximum current is exceeded, the switch is turned off. The current limit circuitry has a time delay of about 0.3 s. If an external resistor is not used, connect ILIM to VIN. This yields the maximum feasible current limit. Further information on ILIM is included in the Applications Information section. An uncommitted gain block on the ADP3000 can be connected as a low battery detector. The inverting input of the gain block is internally connected to the 1.245 V reference. The noninverting input is available at the SET pin. A resistor divider, connected between VIN and GND with the junction connected to the SET pin, causes the AO output to go low when the low battery set point is exceeded. The AO output is an open collector NPN transistor that can sink in excess of 300 A. The ADP3000 provides external connections for both the collector and the emitter of its internal power switch, permitting both step-up and step-down modes of operation. For the step-up mode, the emitter (Pin SW2) is connected to GND, and the collector (Pin SW1) drives the inductor. For stepdown mode, the emitter drives the inductor, while the collector is connected to VIN. The output voltage of the ADP3000 is set with two external resistors. Three fixed voltage models are also available: ADP3000-3.3 (3.3 V), ADP3000-5 (5 V), and ADP3000-12 (12 V). The fixed voltage models include laser-trimmed, voltage-setting resistors on the chip. On the fixed voltage models of the ADP3000, simply connect the feedback pin (Pin 8) directly to the output voltage.
Rev. A | Page 9 of 16
ADP3000 APPLICATIONS INFORMATION
COMPONENT SELECTION
Inductor Selection
For most applications, the inductor used with the ADP3000 falls in the range of 4.7 H to 33 H. Table 4 shows recommended inductors and their vendors. When selecting an inductor for the ADP3000, it is very important to make sure the inductor is able to handle a current higher than the ADP3000's current limit, without becoming saturated. As a general rule, powdered iron cores saturate softly, whereas Ferrite cores saturate abruptly. Rod and open drum core geometry inductors saturate gradually. Inductors that saturate gradually are easier to use. Even though rod and drum core inductors are attractive in both price and physical size, they must be used with care because they have high magnetic radiation. When minimizing EMI is critical, toroid and closed drum core geometry inductors should be used. In addition, inductor dc resistance causes power loss. To minimize power loss, it is best to use an inductor with a dc resistance lower than 0.2 . Table 4. Recommended Inductors
Vendor Coiltronics Coiltronics Sumida Sumida Series OCTAPAC UNIPAC CR43, CR54 CDRH6D28, CDRH73, CDRH64 Core Type Toroid Open Open Semi-Closed Geometry Phone Number (561) 752-5000 (561) 752-5000 (847) 545-6700 (847) 545-6700
Table 5. Recommended Capacitors
Vendor AVX Sanyo Sprague Panasonic Series TPS OS-CON 595D HFQ Type Surface Mount Through Hole Surface Mount Through Hole Phone Number (843) 448-9411 (619) 661-6835 (603) 224-1961 (800) 344-2112
Diode Selection
The ADP3000's high switching speed demands the use of Schottky diodes. Suitable choices include the 1N5817, the 1N5818, the 1N5819, the MBRS120LT3, and the MBR0520LT1. Fast recovery diodes are not recommended because their high forward drop lowers efficiency. General-purpose and smallsignal diodes should be avoided as well.
PROGRAMMING THE SWITCHING CURRENT LIMIT
The ADP3000's RLIM pin permits the cycle-by-cycle switch current limit to be programmed with a single external resistor. This feature offers major advantages that ultimately decrease the component's cost and the PCB's real estate. First, the RLIM pin allows the ADP3000 to use low value, low saturation current and physically small inductors. Additionally, it allows for a physically small surface-mount tantalum capacitor with a typical ESR of 0.1 . With this capacitor, it achieves an output ripple as low as 40 mV to 80 mV, as well as a low input ripple. The current limit is usually set to approximately 3 to 5 times the full load current for boost applications, and about 1.5 to 3 times the full load current in buck applications. The internal structure of the ILIM circuit is shown in Figure 24. Q1, the ADP3000's internal power switch, is paralleled by sense transistor Q2. The relative sizes of Q1 and Q2 are scaled so that IQ2 is 0.5% of IQ1. Current flows to Q2 through both the RLIM resistor and an internal 80 resistor. The voltage on these two resistors biases the base-emitter junction of the oscillator-disable transistor, Q3. When the voltage across R1 and RLIM exceeds 0.6 V, Q3 turns on and terminates the output pulse. If only the 80 internal resistor is used (when the ILIM pin is connected directly to VIN), the maximum switch current is 1.5 A. Figure 13, Figure 14, and Figure 15 give values for lower current limit levels.
RLIM (EXTERNAL) VIN VIN ILIM R1 Q3 80 (INTERNAL) IQ1 200 DRIVER Q2 SW1 Q1 POWER SWITCH
00122-023
Capacitor Selection
For most applications, the capacitor used with the ADP3000 falls in the range of 33 F to 220 F. Table 5 shows recommended capacitors and their vendors. For input and output capacitors, use low ESR type capacitors for best efficiency and lowest ripple. Recommended capacitors include the AVX TPS series, the Sprague 595D series, the Panasonic HFQ series, and the Sanyo OS-CON series. When selecting a capacitor, it is important to make sure the maximum capacitor ripple current rms rating is higher than the ADP3000's rms switching current. It is best to protect the input capacitor from high turn-on current charging surges by derating the capacitor voltage by 2:1. For very low input or output voltage ripple requirements, use capacitors with very low ESR, such as the Sanyo OS-CON series. Alternatively, two or more tantalum capacitors can be used in parallel.
ADP3000
400kHz OSCILLATOR
SW2
Figure 24. ADP3000 Current Limit Operation
Rev. A | Page 10 of 16
ADP3000
The delay through the current limiting circuit is approximately 0.3 s. If the switch-on time is reduced to less than 1.7 s, accuracy of the current trip point is reduced as well. An attempt to program a switch-on time of 0.3 s or less produces spurious responses in the switch-on time. However, the ADP3000 still provides a properly regulated output voltage.
R1 =
VLOBATT - 1.245 V 1.245 V VL - 1.245 V R2 - R + R L HYS
PROGRAMMING THE GAIN BLOCK
The ADP3000's gain block can be used as a low battery detector, an error amplifier, or a linear post regulator. It consists of an op amp with PNP inputs and an open-collector NPN output. The inverting input is internally connected to the 1.245 V reference, and the noninverting input is available at the SET pin. The NPN output transistor sinks in excess of 300 A. Figure 25 shows the gain block configured as a low battery monitor. Set Resistors R1 and R2 to high values to reduce quiescent current, but not so high that bias current in the SET input causes large errors. A value of 33 k for R2 is a good compromise. The value for R1 is then calculated as follows:
where: VL is the logic power supply voltage. RL is the pull-up resistor. RHYS creates the hysteresis.
POWER TRANSISTOR PROTECTION DIODE IN STEP-DOWN CONFIGURATION
When operating the ADP3000 in step-down mode with the switch off, the output voltage is impressed across the internal power switch's emitter-base junction. When the output voltage is set to higher than 6 V, a Schottky diode must be placed in a series with SW2 to protect the switch. Figure 26 shows the proper way to place D2, the protection diode. The selection of this diode is identical to the step-down commuting diode (refer to the Diode Selection section).
VIN C2 + R3
1 2 3
R1 =
V LOBATT - 1.245 V 1.245 V R2
D1, D2 = 1N5818 SCHOTTKY DIODES VOUT > 6V
ILIM
VIN SW1 FB 8
where VLOBATT is the desired low battery trip point. Because the gain block output is an open-collector NPN, a pull-up resistor should be connected to the positive logic power supply.
5V
ADP3000
SW2 4 GND
5
L1 D2
R2
Figure 26. Step-Down Mode VOUT > 6.0 V
ADP3000
R1 VBATT 1.245V REF SET R2 33k
VIN AO
RL 47k
THERMAL CONSIDERATIONS
Power dissipation internal to the ADP3000 can be approximated with the following equations.
GND
TO PROCESSOR
Step-Up
V IN I SW V IN 4 I O PD = I SW 2 R + + I Q V IN ] D 1 - VO I SW
RHYS 1.6M R1 =
00122-024
[ ][
VLB - 1.245V
37.7A VLB = BATTERY TRIP POINT
Figure 25. Setting the Low Battery Detector Trip Point
The circuit of Figure 25 may produce multiple pulses when approaching the trip point due to noise coupled into the SET input. To prevent multiple interrupts to the digital logic, add hysteresis to the circuit. Resistor RHYS, with a value of 1 M to 10 M, provides the hysteresis. The addition of RHYS alters the trip point slightly, changing the new value for R1 to
where: ISW is ILIMIT when the current limit is programmed externally; otherwise, ISW is the maximum inductor current. V0 is the output voltage. I0 is the output current. VIN is the input voltage. R is 1 (typical RCE(SAT)). D is 0.75 (typical duty ratio for a single switching cycle). IQ is 500 A (typical shutdown quiescent current). = 30 (typical forced beta).
Rev. A | Page 11 of 16
00122-025
D1
C1
+
R1
ADP3000
Step-Down
PD = I SW VCESAT 2 I O VO 1 1 + V -V IN CE ( SAT ) I SW + I Q V IN ]
[ ][
For example, consider a boost converter with the following specifications: VIN is 2 V. VO is 3.3 V. IO is 180 mA. ISW is 0.8 A (externally programmed). Using the step-up power dissipation equation:
where: ISW is ILIMIT when the current limit is programmed externally; otherwise, ISW is the maximum inductor current. VCE(SAT) is 1.2 V (typical value). Check this value by applying ISW to Figure 10. VO is the output voltage. IO is the output current. VIN is the input voltage. D is 0.75 (typical duty ratio for a single switching cycle). IQ is 500 A (typical shutdown quiescent current). is 30 (typical forced beta). The temperature rise can be calculated using the following equation: T = PD x JA where: T is temperature rise. PD is device power dissipation. JA is thermal resistance (junction-to-ambient).
(2)(0.8) 2 (4) 0.18 PD = 0.8 2 x 1 + [0.75] 1 - 3.3 0.8 + 500 E - 6 2] 30
[
][
T is 185 mW (170C/W) = 31.5C, using the R-8 package. T is 185 mW (120C/W) = 22.2C, using the N-8 package. At a 70C ambient, the die temperature would be 101.45C for the R-8 package and 92.2C for the N-8 package. These junction temperatures are well below the maximum recommended junction temperature of 125C. Finally, the die temperature can be decreased up to 20% by using a large metal ground plate as ground pickup for the ADP3000.
Rev. A | Page 12 of 16
ADP3000 TYPICAL APPLICATION CIRCUITS
VIN 2V TO 3.2V L1 6.8H C1 + 100F 10V 120
1 2
IN5817
VOUT 3.3V 180mA
VIN 4.5V TO 5.5V
L1 15H C1 + 100F 10V 124
1 2
IN5817
VOUT 12V 50mA
ILIM
VIN SW1 3
ILIM
VIN SW1 3
ADP3000-3.3V
SENSE 8 GND
5
ADP3000-12V
+ C2 100F 10V
GND
5
00122-026
SENSE 8 SW2
4
+
C2 100F 16V
SW2
4
Figure 27. 2 V to 3.3 V/180 mA Step-Up Converter
Figure 30. 4.5 V to 12 V/50 mA Step-Up Converter
VIN 2V TO 3.2V
L1 6.8H C1 + 100F 10V 120
1 2
IN5817
VOUT 5V 100mA
VIN 5V TO 6V
C1 100F 10V
120
1 2 3
ILIM
VIN SW1 FB 8
ILIM
VIN SW1 3
ADP3000-ADJ
SW2 4
ADP3000-5V
SENSE 8 GND
5
+
C2 100F 10V
GND
5
L1 10H C2 + 100F 10V
R2 150k R1 110k
VOUT 3V 100mA
SW2
4
00122-027
D1 1N5817 L1 = SUMIDA CR43-100 C1, C2 = AVX TPS D107 M010R0100 TYPICAL EFFICIENCY = 75%
00122-029
L1 = SUMIDA CR43-6R8 C1, C2 = AVX TPS D107 M010R0100 TYPICAL EFFICIENCY = 75%
L1 = SUMIDA CR54-150 C1 = AVX TPS D107 M010R0100 C2 = AVX TPS D107 M016R0100 TYPICAL EFFICIENCY = 75%
L1 = SUMIDA CR43-6R8 C1, C2 = AVX TPS D107 M010R0100 TYPICAL EFFICIENCY = 80%
Figure 28. 2 V to 5 V/100 mA Step-Up Converter
Figure 31. 5 V to 3 V/100 mA Step-Down Converter
VIN 2.7V TO 4.5V
L1 6.8H C1 + 100F 10V
1
IN5817
120
2
VOUT 5V 150mA
VIN 10V TO 13V
C1+ 33F 20V
250
1 2 3
ILIM
VIN SW1 SENSE 8
ILIM
VIN SW1 3
ADP3000-5V
SW2 4
ADP3000-5V
SENSE 8 GND
5
+
C2 100F 10V
GND
5
L1 10H +
VOUT 5V 250mA C2 100F 10V
4
00122-028
L1 = SUMIDA CR43-6R8 C1, C2 = AVX TPS D107 M010R0100 TYPICAL EFFICIENCY = 80%
Figure 29. 2.7 V to 5 V/150 mA Step-Up Converter
Figure 32. 10 V to 5 V/250 mA Step-Down Converter
Rev. A | Page 13 of 16
00122-031
SW2
L1: SUMIDA CR43-100 C1 = AVX TPS D336 M020R0200 C2 = AVX TPS D107 M010R0100 TYPICAL EFFICIENCY = 77%
D1 1N5817
00122-030
ADP3000
VIN 5V
C1 + 47F 16V
240
1 2 3
ILIM
VIN SW1 SENSE 8
ADP3000-5V
SW2 4 GND
5
L1 15H + C2 100F 10V
D1 1N5817 L1 = SUMIDA CR54-150 C1 = AVX TPS D476 M016R0150 C2 = AVX TPS D107 M010R0100 TYPICAL EFFICIENCY = 60%
VOUT -5V 100mA
00122-032
Figure 33. 5 V to -5 V/100 mA Inverter
2.5V TO 4.2V 100k 100F + 10V AVX-TPS 1M 120 ILIM SET A0 GND 90k VIN SW1 33nF 90k FB SW2 330k 2N2907
(SUMIDA - CDRH62) 6.8H 1N5817 100k 10k 348k 1% + 100F 10V AVX-TPS IN1 IN2 VO1 1F 6V (MLC) 1F 6V (MLC) 3V 100mA
ADP3000
ADP3302AR1
SD VO2 GND
3V 100mA
00122-033
200k 1%
Figure 34. 1 Cell Li-Ion to 3 V/200 mA Converter with Shut-Down at VIN 2.5 V
80
% EFFICIENCY
@ VIN 2.5V SHDN IQ = 500A IO = 50mA + 50mA
75 70 65 2.6 3.0 3.4 3.8 4.2 VIN (V)
IO = 100mA + 100mA
00122-034
Figure 35. Typical Efficiency of the Circuit of Figure 34
Rev. A | Page 14 of 16
ADP3000 OUTLINE DIMENSIONS
0.375 (9.53) 0.365 (9.27) 0.355 (9.02)
8 5
1
4
0.295 (7.49) 0.285 (7.24) 0.275 (6.98) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.015 (0.38) MIN SEATING PLANE 0.060 (1.52) 0.050 (1.27) 0.045 (1.14)
0.100 (2.54) BSC 0.180 (4.57) MAX 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36)
0.150 (3.81) 0.135 (3.43) 0.120 (3.05)
0.015 (0.38) 0.010 (0.25) 0.008 (0.20)
COMPLIANT TO JEDEC STANDARDS MO-095AA CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
Figure 36. 8-Lead Plastic Dual In-Line Package [PDIP] (N-8) Dimensions shown in inches and (millimeters)
5.00 (0.1968) 4.80 (0.1890)
8 5 4
4.00 (0.1574) 3.80 (0.1497) 1
6.20 (0.2440) 5.80 (0.2284)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040)
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) x 45 0.25 (0.0099)
0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE
8 0.25 (0.0098) 0 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
COMPLIANT TO JEDEC STANDARDS MS-012AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
Figure 37. 8-Lead Standard Small Outline Package [SOIC] Narrow Body (R-8) Dimensions shown in millimeters and (inches)
Rev. A | Page 15 of 16
ADP3000
5.10 5.00 4.90
14
8
4.50 4.40 4.30
1 7
6.40 BSC
PIN 1 1.05 1.00 0.80 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.19 0.20 0.09 8 0 0.75 0.60 0.45
SEATING COPLANARITY PLANE 0.10
COMPLIANT TO JEDEC STANDARDS MO-153AB-1
Figure 38. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters
ORDERING GUIDE
Model ADP3000AN ADP3000AN-3.3 ADP3000AN-5 ADP3000AN-12 ADP3000AR ADP3000AR-REEL ADP3000AR-3.3 ADP3000AR-3.3-REEL ADP3000AR-5 ADP3000AR-5-REEL ADP3000AR-12 ADP3000AR-12-REEL ADP3000ARU ADP3000ARU-REEL Output Voltage Adjustable 3.3 V 5V 12 V Adjustable Adjustable 3.3 V 3.3 V 5V 5V 12 V 12 V Adjustable Adjustable Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 8-lead plastic DIP 8-lead plastic DIP 8-lead plastic DIP 8-lead plastic DIP 8-lead SOIC 8-lead SOIC 8-lead SOIC 8-lead SOIC 8-lead SOIC 8-lead SOIC 8-lead SOIC 8-lead SOIC 14-lead TSSOP 14-lead TSSOP Package Option N-8 N-8 N-8 N-8 R-8 R-8 R-8 R-8 R-8 R-8 R-8 R-8 RU-14 RU-14
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00122-0-9/04(A)
Rev. A | Page 16 of 16

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