Datasheet MC33463H-33LT1, MC33463H-50KT1, MC33463H-50LT1, MC33463H-30LT1, MC33463H-33KT1 Datasheet (Motorola)
...Page 1
T
30° t
80°C
The MC33463 series are micropower step–up 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 4.0 µA typical.
The MC33463H–XXKT1 series features a highly accurate voltage
reference, an oscillator, a variable frequency modulation (VFM) controller, a
driver transistor (Lx), a comparator and feedback resistive divider.
The MC33463H–XXLT1 is identical to the MC33463H–XXKT1, 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.
MC33463 Series Features:
• Low Quiescent Bias Current of 4.0 µA
• High Output Voltage Accuracy of ±2.5%
Order this document by MC33463/D
VARIABLE FREQUENCY
MICROPOWER DC–to–DC
CONVERTER
SEMICONDUCTOR
TECHNICAL DATA
TAB
1
H SUFFIX
PLASTIC PACKAGE
CASE 1213
(SOT–89)
• Low Startup Voltage of 0.9 V at 1.0 mA
• Wide Output Voltage Range of 2.5 V to 7.5 V A vailable
• High Efficiency of 80% Typical
• Surface Mount Package
ORDERING INFORMATION
Output
Device
MC33463H–30KT1 3.0
MC33463H–33KT1 3.3
MC33463H–50KT1 5.0
MC33463H–30LT1 3.0
MC33463H–33LT1 3.3
MC33463H–50LT1 5.0
Other voltages from 2.5 V to 7.5 V , in 0.1 V increments are available. Consult factory for
information.
Voltage
Type
Int.
Switch
Ext.
Switch
Drive
Operating
Temperature Range
°
A
= –
o +
°
Package
(Tape/Reel)
SOT–89
SOT–89
(Tape)
(Tape)
PIN CONNECTIONS
MC33463H–XXKT1
1
Ground
2
Output
Lx
3
(Top View)
MC33463H–XXLT1
1
Ground
2
Output
EXT
3
(Top View)
Tab
(Tab is connected
to Pin 2)
Tab
(Tab is connected
to Pin 2)
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
MOTOROLA ANALOG IC DEVICE DATA
Motorola, Inc. 1996 Rev 0
1
Page 2
MC33463
Representative Block Diagrams
MC33463H–XXKT1
D
L
V
in
3
Lx
C
in
VLx Limitier
Drive
VFM
Controller
2
Output
V
O
C
O
100 kHz
Oscillator
L
V
in
C
in
Q
Rb
Cb
This device contains 100 active transistors.
MC33463H–XXLT1
3
EXT
Drive
VFM
Controller
100 kHz
Oscillator
XX Denotes Output Voltage
V
ref
Gnd
1
D
V
2
Output
V
ref
Gnd1
O
C
O
MAXIMUM RATINGS (T
Power Supply Voltage (Transient)
Power Supply Voltage (Operating)
External Pin Voltage
Lx Pin Voltage
EXT Pin Source/Sink Current
Lx Pin Sink Current
Power Dissipation and Thermal Characteristics
H Suffix, Plastic Package Case 1213 (SOT–89)
Maximum Power Dissipation @ T
Thermal Resistance, Junction–to–Air R
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
= 25°C, unless otherwise noted.)
C
Rating Symbol Value Unit
= 25°C P
A
2
V
V
V
I
CC
CC
EXT
V
Lx
EXT
I
Lx
D
θJA
T
J
T
A
T
stg
12
8.0
–0.3 to V
–30 to +80
–40 to +125
O
12
50/50
250
500 mW
200 °C/W
125
V
V
V
V
mA
mA
°C
°C
°C
MOTOROLA ANALOG IC DEVICE DATA
Page 3
MC33463
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ELECTRICAL CHARACTERISTICS (V
Characteristic
= 2.0 V, IO = 10 mA and TA = 25°C, unless otherwise noted.)
CC
Symbol Min Typ Max Unit
OSCILLAT OR
Frequency
Oscillator Minimum Supply Voltage (IO = 0 mA)
Oscillator Duty Ratio Each Cycle
V
f
osc
CC
D
80
65
100
–
0.7
75
Lx OUTPUT (KT1 SUFFIX)
ON State Sink Current (VLx = 0.4 V)
I
Lx
30KT1 Suffix 60 – –
33KT1 Suffix 63 – –
50KT1 Suffix 80 – –
VLx Voltage Limit (Note 1) V
OFF State Leakage Current (VLx = 6.0 V)
LxLim
I
LKG
0.65 0.8 1.0 V
–
–
EXT OUTPUT (LT1 SUFFIX)
ON State Source Current (V
= VO – 0.4 V)
EXT
I
source
30LT1 Suffix 1.5 – –
33LT1 Suffix 1.575 – –
50LT1 Suffix 2.0 – –
OFF State Sink Current (V
EXT
= 0.4 V)
I
sink
30LT1 Suffix 1.5 – –
33LT1 Suffix 1.575 – –
50LT1 Suffix 2.0 – –
TOTAL DEVICE
Output Voltage
V
O
30KT1 or 30LT1 Suf fix 2.925 3.0 3.075
33KT1 or 33LT1 Suf fix 3.218 3.3 3.383
50KT1 or 50LT1 Suf fix 4.875 5.0 5.125
Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA)
I
Q
30KT1 Suffix – 4.0 8.0
33KT1 Suffix – 4.3 8.6
50KT1 Suffix – 6.0 12
Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA)
30KT1 Suffix – 1.2 5.0
33KT1 Suffix – 1.2 5.0
50KT1 Suffix – 2.0 5.0
Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA)
I
Q
30LT1 Suffix – 30 50
33LT1 Suffix – 34.5 56
50LT1 Suffix – 60 90
Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA)
30LT1 Suffix – 1.2 5.0
33LT1 Suffix – 1.2 5.0
50LT1 Suffix – 2.0 5.0
NOTE: 1.When the Lx switch is turned on, ILx carried through the R
off by the Lx switch protection circuit.
of the Lx switch results in VLx. When VLx reaches V
DS(on)
, the Lx switch is turned
LxLim
120
0.8
85
0.5
kHz
V
%
mA
µA
mA
mA
V
µA
µA
MOTOROLA ANALOG IC DEVICE DATA
3
Page 4
MC33463
Figure 1. Quiescent Current versus T emperature
50
MC33463H–30LT1
µ
Vin = 2.0 V
IO = 0 mA
40
30
20
, QUIESCENT BIAS CURRENT ( A)
Q
I
10
–40
–20
0
TA, AMBIENT TEMPERATURE (°C)
20 40
60
Figure 3. Oscillator Frequency versus T emperature
200
MC33463H–50KT1
Vin = 2.0 V
IO = 10 mA
160
Figure 2. Quiescent Current versus T emperature
2.0
MC33463H–30KT1
µ
Vin = 3.5 V
IO = 0 mA
1.6
1.2
0.8
, QUIESCENT BIAS CURRENT ( A)
Q
I
0.4
80 –20
–40
100
MC33463H–50KT1
Vin = 2.0 V
IO = 10 mA
90
0
TA, AMBIENT TEMPERATURE (
20
40
°
C)
Figure 4. Oscillator Duty Ratio
versus T emperature
60
80
D, DUTY RATIO (%)
80
70
60
–40
–20
0
TA, AMBIENT TEMPERATURE (°C)
20
40
60
120
80
, OSCILLAT OR FREQUENCY (kHz)
osc
f
40
–40
–20
0
TA, AMBIENT TEMPERATURE (°C)
20
40
60
80
Figure 5. Lx Switching Current versus Temperature Figure 6. VLx V oltage Limit versus Temperature
200
160
120
80
, Lx SWITCHING CURRENT (mA)
MC33463H–50KT1
Lx
Vin = 2.0 V
I
IO = 10 mA
40
–40
–20
0
TA, AMBIENT TEMPERATURE (°C)
20
40
60
80
0.9
0.8
0.7
, Lx VOLTAGE LIMIT (V)
0.6
LxLim
MC33463H–50KT1
V
Vin = 2.0 V
IO = 10 mA
0.5
–40
–20
0
TA, AMBIENT TEMPERATURE (°C)
20
40
60
80
80
4
MOTOROLA ANALOG IC DEVICE DATA
Page 5
MC33463
Figure 7. Output Voltage versus Output Current
6.0
5.0
Vin = 1.5 V
Vin = 0.9 V
20
Vin = 2.0 V
MC33463H–50KT1
L = 120
TA = 25
40
IO, OUTPUT CURRENT (mA)
60
80
, OUTPUT VOL TAGE (V)
O
V
4.0
3.0
2.0
1.0
0
Figure 9. Efficiency versus Output Current Figure 10. Efficiency versus Output Current
100
80
Vin = 2.0 V
60
Vin = 0.9 V
40
EFFICIENCY (%)
MC33463H–33KT1
L = 82
20
TA = 25
Figure 15
0
0
µ
H
°
C
20
40
IO, OUTPUT CURRENT (mA)
60
80
Vin = 4.0 V
Vin = 3.0 V
µ
H
°
C
100
Vin = 3.0 V
100
120
120
Figure 8. Output Voltage versus Output Current
6.0
5.0
Vin = 2.0 V
300
300
400
Vin = 3.0 V
400
, OUTPUT VOL TAGE (V)
O
V
EFFICIENCY (%)
4.0
3.0
2.0
1.0
100
80
60
40
20
0
0
0
Vin = 0.9 V
MC33463H–50LT1
µ
H
L = 28
°
C
TA = 25
100
Vin = 0.9 V
MC33463H–33LT1
µ
H
L = 28
°
C
TA = 25
Figure 16
100
Vin = 1.5 V
200
IO, OUTPUT CURRENT (mA)
Vin = 2.0 V
200
IO, OUTPUT CURRENT (mA)
Vin = 3.0 V
500
500
600
600
Figure 11. Startup/Hold Voltage versus
Output Current
1.6
1.2
V
start
0.8
0.4
, STARTUP/HOLD VOLTAGE LIMIT (V)V
hold
/V
start
0
0
V
hold
2.0
4.0
IO, OUTPUT CURRENT (mA)
6.0
8.0
MOTOROLA ANALOG IC DEVICE DATA
MC33463H–50KT1
µ
H
L = 82
°
C
TA = 25
10
12
, VOLTAGE LIMIT (V)V
hold
/V
start
Figure 12. Startup/Hold Voltage versus
Output Current
2.0
V
1.5
1.0
0.5
start
V
hold
0
0
20
40
IO, OUTPUT CURRENT (mA)
60
MC33463H–50LT1
µ
H
L = 28
°
C
TA = 25
80
100
120
5
Page 6
Figure 13. Output V oltage versus Temperature
5.1
MC33463
Figure 14. Startup/Hold Voltage
versus T emperature
1.0
5.0
4.9
, OUTPUT VOL TAGE (V)
O
V
MC33463H–50KT1
µ
H
4.8 0.2
–40
TA, AMBIENT TEMPERATURE (°C)
L = 120
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.
FUNCTIONAL DESCRIPTION
Introduction
The MC33463 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
Figure 15 and Figure 16.
Operating Description
The MC33463 series converters each operate as a fixed
on–time, variable off–time voltage mode ripple 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 and flyback converter designs
to provide initial power to the integrated circuit to begin
switching. The startup circuit needed can be three discrete
, STARTUP/HOLD VOLTAGE (V)V
hold
/V
start
0.8
0.6
0.4
–40
–20–20 00 2020 4060 806040 80
TA, AMBIENT TEMPERATURE (
MC33463H–50KT1
L = 120
IO = 1.0 mA
°
C)
V
start
V
hold
µ
H
components, as shown in Figure 17, or a micropower
undervoltage sensor, as shown in Figure 18.
Oscillator
The oscillator frequency, is internally programmed to
100 kHz. The duty ratio of the oscillator is designed for a
constant value of 0.75 nominal. Hence the nominal on–time
of the power switch is:
ton+
f
osc
D
+
(100 kHz)
0.75
+
7.5 µs
Feedback Comparator
The output voltage is sensed and fed to a high speed
comparator noninverting input through an internal resistive
divider. The comparator inverting input is connected to an
internally trimmed to 0.7 V reference.
With a voltage mode ripple converter operating under
normal conditions, output switch conduction is initiated and
terminated by the oscillator, off–time is controlled by the high
speed voltage feedback comparator.
Driver and Output Switch
To aid in system design flexibility and conversion
efficiency, two output driver options are provided. The
MC33463H–XXKT1 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 MC33463H–XXLT1 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 15 through
19.
6
MOTOROLA ANALOG IC DEVICE DATA
Page 7
MC33463
Figure 15. MC33463H–50KT1 T ypical Step–Up Application
MBRD520LT1
82 µH
V
in
MC33463H–XXKT1
3
Lx
Gnd
V
O
1
2
Figure 16. MC33463H–50L T1 Typical Step–Up Application
MBRD520LT1
28 µH
V
in
MMBT2222ALT1
300
MC33463H–XXLT1
V
O
3
EXT
2
22 µF
100 µF
V
O
V
O
0.01
Gnd
µ
F
1
MOTOROLA ANALOG IC DEVICE DATA
7
Page 8
MC33463
Figure 17. MC33463H–33KT1 Step–Down Application
Startup Circuit
MMBT2222AL T1
1.5 k
BZX84C3V3L T1
3.3 V
47
µH
1.0 k
µF
MMBT2907AL T1
100
Lx Output
MBRD0520LT1
MC33463H–33KT1
3
VLx Limiter
2
V
in
100
V
O
3.3 V
Drive
VFM
Controller
100 kHz
Oscillator
Test Conditions Results
Line Regulation Vin = 5.0 V to 8.0 V, IO = 100 mA 18.5 mV = ±0.3%
Load Regulation Vin = 5.0 V, IO = 1.0 mA to 100 mA 5.7 mV = ±0.1%
Output Ripple Vin = 5.0 V, IO = 100 mA 40 mVpp
Efficiency Vin = 5.0 V, IO = 100 mA 60.3%
V
ref
Gnd
1
100
µF
8
MOTOROLA ANALOG IC DEVICE DATA
Page 9
MC33463
Figure 18. Micropower Step–Down Application
Startup Circuit
MMBT2907ALT1MC33464N–30ATR
2
In
Gnd
1.0 k
µF
MMBT2907ALT1
100
Lx
MBRD0520LT1
MC33463H–33KT1
3
VLx Limiter
V
in
100
3
Out
1
10 k10 k
47
µH
V
O
3.3 V
2
Output
Drive
VFM
Controller
100 kHz
Oscillator
100
µF
V
ref
Gnd
1
MOTOROLA ANALOG IC DEVICE DATA
9
Page 10
MC33463
Figure 19. Flyback Application
MMBT2222AL T1
1.5 k
Startup Circuit
3.3 V
V
in
100
MMBT2907AL T1
1.0 k
µF
100
Lx
V
O
MC33463H–33KT1
3
VLx Limiter
Drive
VFM
Controller
100 kHz
Oscillator
V
ref
1
Gnd
2
Output
100
µF
10
MOTOROLA ANALOG IC DEVICE DATA
Page 11
MC33463
Figure 20. Design Equations
Calculation Step–Down Step–Up Flyback
t
on
L
t
t
on
I
L(avg)
I
L(pk)
V
ripple(pp)
The following converter design characteristics must be chosen:
Vin – Nominal Operating dc input voltage
VO – Desired dc output voltage
IO – Desired dc output current
V
affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator
applications.
NOTE: 1. V
– Desired peak–to–peak output ripple voltage. For best performance the ripple voltage should be kept to a low value since it will directly
ripple(pp)
– Saturation voltage of the switching transistor.
sat
n – Estimated circuit efficiency .
D
(Vin*
ȱ
I
ȧ
L
Ȳ
ǒ
16f
(Vin*
ƪ
1
osc
D
f
osc
V
*
VO)
sat
(2IO)
I
O
V
*
VO)(ton)
sat
L
2
Ǔ
)(ESR
C
O
ƫ
1
2
ȳ
2
)
ȧ
ȴ
f
(n)(Vin)2(ton)
t
(Vin*
(ton)(IO)
[
D
osc
P
I
in
V
sat
L
(CO)
O
)(ton)
f
(n)(Vin)2(ton)
t
(Vin*
(ton)(IO)
[
D
osc
P
I
in
V
sat
L
(CO)
O
)(ton)
MOTOROLA ANALOG IC DEVICE DATA
11
Page 12
MC33463
OUTLINE DIMENSIONS
H SUFFIX
PLASTIC PACKAGE
CASE 1213–01
(SOT–89)
ISSUE O
A
E
D
D1
B
A2
C
E1
L1
B
M
0.10 CSBSA
C
B1 2X
e
M
0.10 CSBSA
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCING
PER ASME Y14.5M, 1994.
3. DATUM C IS A SEATING PLANE.
MILLIMETERS
DIM MIN MAX
A2 1.40 1.60
B 0.37 0.57
B1 0.32 0.52
C 0.30 0.50
D 4.40 4.60
D1 1.50 1.70
E ––– 4.25
E1 2.40 2.60
e 1.50 BSC
e1 3.00 BSC
L1 0.80 –––
e1
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. “T ypical” 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
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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
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Opportunity/Affirmative Action Employer.
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MOTOROLA ANALOG IC DEVICE DATA
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MC33463/D
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