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MC33466
Advanced Information
Fixed Frequency PWM Micropower DC-to-DC Converter
The MC33466 series are micropower switching voltage regulators, specifically designed for handheld and laptop applications, to provide regulated output voltages using a minimum of external parts. A wide choice of output voltages are available. These devices feature a very low quiescent bias current of 15 A typical. The MC33466H-XXJT1 series features a highly accurate voltage reference, an oscillator, a pulse width modulation (PWM) controller, a driver transistor (Lx), an error amplifier and feedback resistive divider. The MC33466H-XXLT1 is identical to the MC33466H-XXJT1, except that a drive pin (EXT) for an external transistor is provided. Due to the low bias current specifications, these devices are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable.
1 TAB
FIXED FREQUENCY PWM MICROPOWER DC-to-DC CONVERTER
SEMICONDUCTOR TECHNICAL DATA
MC33466 Series Features:
* * * * *
Low Quiescent Bias Current of 15 A High Output Voltage Accuracy of 2.5% Low Startup Voltage of 0.9 V at 1.0 mA Soft-Start = 500 s Surface Mount Package
H SUFFIX PLASTIC PACKAGE CASE 1213 (SOT-89)
PIN CONNECTIONS
MC33466H-XXJT1
ORDERING INFORMATION
Device MC33466H-30JT1 MC33466H-33JT1 MC33466H-50JT1 MC33466H-30LT1 MC33466H-33LT1 MC33466H-50LT1 Output Voltage 3.0 3.3 5.0 3.0 3.3 5.0 Type Int. Switch S it h Ext. Switch S it h Di Drive TA = -30 to +80C 30 80C Operating Temperature Range Package (Tape/Reel) SOT-89 (Tape) (T ) SOT-89 (Tape) (T ) MC33466H-XXLT1 Ground Output EXT 1 2 3 (Top View) Tab (Tab is connected to Pin 2) Ground Output Lx 1 2 3 (Top View) Tab (Tab is connected to Pin 2)
Other voltages from 2.5 V to 7.5 V, in 0.1 V increments are available. Consult factory for information.
This document contains information on a new product. Specifications and information herein are subject to change without notice.
(c) Motorola, Inc. 1997
Rev 1
MOTOROLA ANALOG IC DEVICE DATA
1
MC33466
Representative Block Diagrams
MC33466H-XXJT1
D L Vin Cin 3 Lx VLx Limiter Drive PWM Controller 50 kHz Oscillator Phase Comp Soft-Start Vref 2 Output (Voltage Feedback) CO VO
1
Gnd
L Vin Cin
MC33466H-XXLT1
D VO 2 Rb 3 EXT Cb PWM Controller 50 kHz Oscillator Phase Comp Soft-Start Vref 1 Gnd Output (Voltage Feedback) CO
Q
Drive
XX Denotes Output Voltage This device contains 100 active transistors.
MAXIMUM RATINGS (TC = 25C, unless otherwise noted.)
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Power Supply Voltage (Transient) VO VO 12 V V V V Power Supply Voltage (Operating) External Pin Voltage Lx Pin Voltage 8.0 VEXT VLx -0.3 to VO 12 EXT Pin Source/Sink Current Lx Pin Sink Current IEXT ILx 50/50 250 mA mA Power Dissipation and Thermal Characteristics H Suffix, Plastic Package Case 1213 (SOT-89) Maximum Power Dissipation @ TA = 25C Thermal Resistance, Junction-to-Air Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range PD RJA TJ TA 500 200 125 mW C/W C C C -30 to +80 Tstg -40 to +125
NOTE: ESD data available upon request.
Rating
Symbol
Value
Unit
2
MOTOROLA ANALOG IC DEVICE DATA
MC33466
ELECTRICAL CHARACTERISTICS (VCC = 2.0 V, IO = 10 mA and TA = 25C, unless otherwise noted.)
Characteristic OSCILLATOR Frequency Symbol Min Typ Max Unit
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fosc 40 - 50 60 kHz V V Oscillator Minimum Startup Voltage (IO = 0 mA) Oscillator Minimum Supply Voltage (IO = 0 mA) Vstart VCC 0.8 - 0.9 - 0.7 LX OUTPUT (JT1 SUFFIX) ON State Sink Current (VLx = 0.4 V) 30KT1 Suffix 33KT1 Suffix 50KT1 Suffix VLx Voltage Limit (Note 1) ILx mA 60 63 80 - - - - - - VLxLim ILKG 0.65 - 0.8 - 1.0 0.5 V OFF State Leakage Current (VLx = 6.0 V) A EXT OUTPUT (LT1 SUFFIX) ON State Source Current (VEXT = VO - 0.4 V) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix OFF State Sink Current (VEXT = 0.4 V) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix Isource mA 1.5 1.575 2.0 1.5 1.575 2.0 - - - - - - - - - - - - Isink mA TOTAL DEVICE Maximum Duty Ratio Each Cycle Output Voltage 30KT1 or 30LT1 Suffix 33KT1 or 33LT1 Suffix 50KT1 or 50LT1 Suffix D 70 80 90 % V VO 2.925 3.218 4.875 0.5 - - - - - - - - - - - - 3.0 3.3 5.0 2.0 15 17 30 3.075 3.383 5.125 - Soft-Start Time (Note 2) Tss IQ ms A
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A
Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix IQ A 30 34.5 60 1.2 1.2 2.0 50 56 90 5.0 5.0 5.0
NOTES: 1. When the Lx switch is turned on, ILx current carried through the RDS(on) of the Lx switch results in VLx. When VLx reaches VLxLim, the Lx switch is turned off by the Lx switch protection circuit. 2. The soft-start circuit turn-on sequence is as follows: a) Vin is applied. b) The internal IC Vref is held at zero for 200 s. During this time, the error amplifier output voltage ramps up to the positive voltage rail. c) The internal reference steps up to 0.7 V after 200 s delay has timed out. d) The error amplifier output voltage integrates down to its steady state value. As the error amplifier output integrates down, the output Lx pin of EXT pin pulse width gradually widens to its steady operating value.
Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA) 30JT1 Suffix 33JT1 Suffix 50JT1 Suffix Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA) 30JT1 Suffix 33JT1 Suffix 50JT1 Suffix
25 27 45
1.2 1.2 2.0
5.0 5.0 5.0
MOTOROLA ANALOG IC DEVICE DATA
3
MC33466
Figure 1. Quiescent Current versus Temperature
50 I Q , QUIESCENT BIAS CURRENT ( A) I Q , QUIESCENT BIAS CURRENT ( A) MC33466H-33JT1 IO = 0 mA Vin = 2.0 V 2.0 MC33466H-33JT1 IO = 0 mA Vin = 5.5 V
Figure 2. Quiescent Current versus Temperature
40
1.6
30
1.2
20
0.8
10 -40
-20
0
20
40
60
80
0.4 -40
-20
0
20
40
60
80
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 3. Oscillator Frequency versus Temperature
100 fosc , OSCILLATOR FREQUENCY (kHz) Dmax , MAXIMUM DUTY RATIO (%) MC33466H-50JT1 L = 120 H IO = 10 mA Vin = 3.0 V 100
Figure 4. Maximum Duty Ratio versus Temperature
MC33466H-50JT1 L = 120 H IO = 10 mA Vin = 3.0 V
80
90
60
80
40
70
20 -40
-20
0
20
40
60
80
60 -40
-20
0
20
40
60
80
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 5. Lx Switching Current versus Temperature
200 I Lx , Lx SWITCHING CURRENT (mA) VLxLim, V Lx VOLTAGE LIMIT (V) 0 20 40 60 80 160 120 80 40 0 -40 MC33466H-50JT1 IO = 10 mA Vin = 2.0 V -20 TA, AMBIENT TEMPERATURE (C) 1.0 0.9 0.8 0.7
Figure 6. VLx Voltage Limit versus Temperature
0.6 MC33466H-50JT1 IO = 10 mA Vin = 2.0 V 0.5 -40 -20 0
20
40
60
80
TA, AMBIENT TEMPERATURE (C)
4
MOTOROLA ANALOG IC DEVICE DATA
MC33466
Figure 7. Output Voltage versus Output Current
6.0 VO , OUTPUT VOLTAGE (V) VO , OUTPUT VOLTAGE (V) 5.0 4.0 Vin = 2.0 V 3.0 Vin = 1.0 V 2.0 1.0 MC33466H-50JT1 L = 120 H TA = 25C 0 20 40 60 80 100 120 IO, OUTPUT CURRENT (mA) Vin = 4.0 V 6.0 Vin = 2.0 V 5.0 Vin = 4.0 V 4.0 Vin = 1.5 V 3.0 2.0 MC33466H-50LT1 L = 28 H TA = 25C 1.0 0 100 200 Vin = 3.0 V
Figure 8. Output Voltage versus Output Current
Vin = 3.0 V
300
400
500
600
IO, OUTPUT CURRENT (mA)
Figure 9. Efficiency versus Output Current
100 80 EFFICIENCY (%) 60 40 20 0 MC33466H-30JT1 L = 120 H TA = 25C Figure 17 0 5.0 10 15 20 25 30 Vin = 2.0 V EFFICIENCY (%) Vin = 1.5 V Vin = 1.0 V 100 80 60 40
Figure 10. Efficiency versus Output Current
Vin = 1.5 V
Vin = 2.0 V
Vin = 0.9 V 20 0
MC33466H-30LT1 L = 28 H TA = 25C Figure 18 200 300 400 500 600
0
100
IO, OUTPUT CURRENT (mA)
IO, OUTPUT CURRENT (mA)
Figure 11. Startup/Hold Voltage versus Output Current
2.0 Vstart /V hold , VOLTAGE LIMIT (V) VLxLim, V Lx VOLTAGE LIMIT (V) 1.6 1.2 Vstart 0.8 0.4 0 Vhold 0 2.0 4.0 6.0 MC33466H-50JT1 L = 120 H TA = 25C Figure 17 8.0 10 12 1.6 1.4 1.2 1.0 0.8
Figure 12. Startup/Hold Voltage versus Output Current
Vstart MC33466H-50LT1 L = 28 H TA = 25C Figure 18 40 60 80 100 120
Vhold 0.6 0 20
IO, OUTPUT CURRENT (mA)
IO, OUTPUT CURRENT (mA)
MOTOROLA ANALOG IC DEVICE DATA
5
MC33466
Figure 13. Output Voltage versus Temperature
Vstart/V hold, STARTUP/HOLD VOLTAGE (V) 1.0 5.2 VO , OUTPUT VOLTAGE (V) 5.1 5.0 4.9 4.8 -40 -20 0 20 40 60 80 MC33466H-50JT1 L = 120 H IO = 10 mA Vin = 3.0 V Figure 17
Figure 14. Startup/Hold Voltage versus Temperature
0.8
Vstart
0.6 Vhold 0.4 MC33466H-50JT1 L = 120 H IO = 3.0 mA Figure 17 -20 0 20 40 60 80
0.2 -40
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 15. Supply Current versus Input Voltage
250 I CC , SUPPLY CURRENT ( A) VO , OUTPUT VOLTAGE (V) 200 150 100 50 0 MC33466H-50JT1 L = 120 H IO = 10 mA Figure 17 5.4 5.2 5.0 4.8
Figure 16. Load Transient Response
250 200 150 100 50 4.6 0 60 I O , OUTPUT CURRENT ( A) MC33466H-50JT1 L = 120 H IO = 1.0 to 30 mA Vin = 3.0 V Figure 17
0
1.0
2.0
3.0
4.0
5.0
6.0
0
10
20
30 t, TIME (ms)
40
50
Vin, INPUT VOLTAGE (V)
6
MOTOROLA ANALOG IC DEVICE DATA
MC33466
DEFINITIONS
Quiescent Bias Current - Current which is used to operate the switching regulator chip and is not delivered to the load. Leakage Current - Current drawn through a transistor junction, under a specified collector voltage, when the transistor is off. oscillator generates an internal blanking pulse that holds the PWM control off, disabling the output transistor drive. The oscillator peak and valley thresholds are 0.5 V and ground, respectively. Pulse Width Modulator The Pulse Width Modulator consists of a comparator with the oscillator ramp voltage applied to the inverting input, while the error amplifier output is applied to the noninverting input. Output switch conduction is initiated when the timing capacitor is charged to its peak voltage value. When the timing capacitor ramp discharges to a voltage below the error amplifier output, the comparator resets a latch terminating output transistor drive for the duration of the oscillator ramp period. Error Amplifier and Reference An Error Amplifier is provided which has a nominal 80 dB of voltage gain at dc. Internal compensation components provide poles at 0.25 Hz, 30 kHz and 33 kHz. Two zeros are provided at 1.0 kHz and at 2.5 kHz. The output voltage value is set by the internal voltage divider and a 0.7 V reference which is trimmed to an accuracy of 2.5%. Because the loop compensation components are located within the IC, discontinuous mode operation is recommended for most applications. Driver and Output Switch To aid in system design flexibility and conversion efficiency, two output driver options are provided. The MC33466H-XXJT1 converters have an internal drive transistor which is capable of sinking currents greater than 60 mA into the Lx pin. An internal VLx limiter circuit senses if the Lx pin voltage exceeds 1.0 V during ton and turns off the drive transistor. The MC33466H-XXJT1 provides output drive for an external transistor. Applications The following converter applications show the simplicity and flexibility of the converter architecture. Three main converter topologies are demonstrated in Figures 17 through 21.
FUNCTIONAL DESCRIPTION
Introduction The MC33466 series are monolithic power switching regulators optimized for dc-to-dc converter applications where power drain must be minimized. The combination of features in this series allows the system designer to directly implement step-up, step-down or flyback converters with a small number of external components. Potential applications include low power consumer products and battery powered portable products. Typical application circuits are shown in Figures 17 through 21. Operating Description The MC33466 series converters operate as a fixed frequency voltage mode regulator. Operation is intended to be in the discontinuous mode, where the inductor current ramps up to a peak value which is greater than or equal to twice the value of the dc input current during the on-time of the transistor switch. During the off-time of the transistor switch, the inductor current ramps down to zero and remains at zero until another switching cycle begins. Because the output voltage pin is also used as the supply voltage for powering internal circuitry, an external startup circuit is needed in step-down converter and flyback designs to provide initial power to the integrated circuit to begin switching. The startup circuit needed can be three discrete components, as shown in Figure 19, or a micropower undervoltage sensor, as shown in Figure 20. Oscillator The oscillator frequency, is internally programmed to 50 kHz. The timing capacitor (CT) discharge to charge ratio of the oscillator is designed for a maximum duty cycle of 80% at the Lx or EXT output. During the charge of CT, the
Figure 17. MC33466H-50KT1 Typical Step-Up Application
MBRD520LT1
Figure 18. MC33466H-50LT1 Typical Step-Up Application
MBRD520LT1 28 H
120 H Vin 22 F
MC33466H-50KT1 2 3 Lx VO 22 F
Vin VO 22 F 300 MMBT2222ALT1
MC33466H-50LT1 2 VO 3 EXT Gnd 1
VO 5.0 V 100 F
Gnd 1 0.01 F
MOTOROLA ANALOG IC DEVICE DATA
7
MC33466
Figure 19. MC33466H-33JT1 Step-Down Application
Startup Circuit MMBT2222ALT1 1.5 k BZX84C3V3LT1 3.3 V
47 H Vin 330 F 1.0 k MMBT2907ALT1 MBRD0520LT1 VO 3.3 V 320 mA
100 3 Lx
MC33466H-33JT1 VLx Limiter 2 Output
Drive
PWM Controller Phase Comp 50 kHz Oscillator Soft-Start Vref
330 F
330 F
1
Gnd
Test Line Regulation Load Regulation Output Ripple Efficiency
Condition Vin = 5.0 V to 10 V, IO = 320 mA Vin = 7.0 V, IO = 3.3 mA to 320 mA Vin = 7.0 V, IO = 320 mA Vin = 7.0 V, IO = 320 mA
Results 7 mV = 0.1% 3 mV = 0.04% 70 mVpp 63.8%
8
MOTOROLA ANALOG IC DEVICE DATA
MC33466
Figure 20. Micropower Step-Down Application
Startup Circuit MC33464N-30ATR 2 In Out Gnd 3 1 10 k MMBT2222ALT1
10 k 47 H Vin 5.0 V 100 F 1.0 k MMBT2907ALT1 MBRD0520LT1 VO 3.3 V 300 mA
100 3 Lx
MC33466H-33JT1 VLx Limiter 2 Output Drive 100 F
PWM Controller Phase Comp 50 kHz Oscillator Soft-Start Vref
1
Gnd
NOTE:
Using the MC33464N-30ATR reduces current drawn in the startup circuit to 1 mA during normal operation.
MOTOROLA ANALOG IC DEVICE DATA
9
MC33466
Figure 21. Flyback Application
Startup Circuit
1.5 k MMBT2222ALT1 3.3 V
Vin 100 F 1.0 k
MMBT2907ALT1
VO 3.3 V
100 3 Lx
MC33466H-33KT1 VLx Limiter 2 Output Drive 100 F
PWM Controller Phase Comp 50 kHz Oscillator Soft-Start Vref
1
Gnd
10
MOTOROLA ANALOG IC DEVICE DATA
MC33466
Figure 22. Design Equations
Calculation L Step-Down Step-Up Flyback
t (Vin -2IVO)(ton)
O
t (Vin)(ton) 2I
in
t (Vin)(ton) 2I
in
ton D
D fs
D fs
D fs
t
(V in
(V ) O (V ) in IO
t
(V in
(V
V) in O (V ) O Iin
*
t
V
O
Ns (V ) in Np Iin L
)VO
IL(avg) IL(pk)
* VO)(ton)
L
* Vsat)(ton)
L 2 1 2
(V
in
* Vsat)(ton)
Vripple(pp) I L(pk) 1 8fsC
O
) (ESR)2
The following converter design characteristics must be chosen: Vin - Nominal Operating dc input voltage VO - Desired dc output voltage IO - Desired dc output current Vripple(pp) - Desired peak-to-peak output ripple voltage. For best performance the ripple voltage should be kept to a low value since it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator applications. D - Operating duty cycle = ton(fs). This parameter must be chosen to be <0.5 for step-up and flyback applications. NOTES: 1. Vsat - Saturation voltage of the switching transistor. 2. Iin - DC input switch. 3. fs - Switching frequency, nominally 50 kHz. 4. RO - Load resistance. RO = VO/IO. 5. Ns, Np - In flyback applications Ns is the number of turns of the secondary transformer winding; Np is the number of the primary winding turns.
Design Example - Step-down Application Required: Vin = 8.0 V, an output voltage of 3.3 V at 300 mA is desired with an output ripple of less than 300 mVpp. R O
+ I O + 11 W
V
O
1. Because this is a discontinuous mode design, D 0.33 D [ fs + (50 kHz) + 6.6 s.
t VO + 3.3 + 0.41. Choose D = 0.33. 8
V
in
2. t on
3. L
V 3.3)(6.6 t (Vin -2I O)(ton) + (8 - [2(0.3)] s) + 51.7 H. O
Choose L = 47 H. Coilcraft part number DO3316P-473. 3.3)(6.6 + (Vin - VO)(ton) + (8 - (47 H) s) + 660 mA. L V ripple(pp) I L(pk)
4. I
L(pk)
5. ESR
t
+ (300 mV) + 0.455 W. (660 mA)
Choose CO = two parallel AVX 330 F tantalum chip capacitors. Part Number TAJE337M006. Specified maximum ESR for each is 0.9 . The complete design schematic is shown in Figure 19.
MOTOROLA ANALOG IC DEVICE DATA
11
MC33466
OUTLINE DIMENSIONS
H SUFFIX PLASTIC PACKAGE CASE 1213-01 (SOT-89) ISSUE O
A
D D1 B
A2 C
NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCING PER ASME Y14.5M, 1994. 3. DATUM C IS A SEATING PLANE. MILLIMETERS MIN MAX 1.40 1.60 0.37 0.57 0.32 0.52 0.30 0.50 4.40 4.60 1.50 1.70 --- 4.25 2.40 2.60 1.50 BSC 3.00 BSC 0.80 ---
E L1 B
E1
0.10 B1 e e1
2X
M
CB
S
A
S
C
0.10
M
CB
S
A
S
DIM A2 B B1 C D D1 E E1 e e1 L1
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola 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 consequential or incidental damages. "Typical" parameters which may be provided in Motorola 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. Motorola does not convey any license under its patent rights nor the rights of others. Motorola 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 Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola 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 Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 303-675-2140 or 1-800-441-2447 JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. 81-3-5487-8488
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12
MOTOROLA ANALOG IC DEVICE DATA
MC33466/D

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