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Motorola Electronic Components Datasheet

MC33468 Datasheet

VARIABLE FREQUENCY MICROPOWER DC-to-DC CONVERTER

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Variable Frequency
Micropower Step-up DC-DC
Converter
The MC33468 is a micropower step–up switching voltage regulator,
specifically designed for handheld and pager applications, to provide a
regulated output voltage using a minimum of external parts. This device
features a quiescent bias current of 3.0 µA typical.
The MC33468 features a highly accurate voltage reference, an error
amplifier, an oscillator, a variable frequency modulation (VFM) controller, a
drive pin (EXT) for an external transistor, and feedback resistors.
The Vout pin is fixed at 2V in the IC. The output of the converter with an
inductor, a diode, a capacitor, a drive transistor, and feed–back resistors can
have an output of 30V.
MC33468 Features:
Low Quiescent Bias Current of 3.0 µA
High Output Voltage Accuracy of ±2.5%
Low Startup Voltage of 0.8 V at No Load
Output Voltage Set With External Resistors
Operating Temperature Range: –40°C to +85°C
Surface Mount Package
ORDERING INFORMATION
Device
Output
Voltage Marking
Reel
Size
Tape
Width Quantity
MC33468SN–20ATR
2.0
* “XX” denotes the lot number.
0KXX*
7”
8 mm
3000
PIN DESCRIPTION
Pin No.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ4
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ5
Symbol
GND
VDD
EXT
NC
VOUT
Description
Ground
Input
External Transistor Drive
No Connection
Voltage Output Pin (Fixed at 2V)
Representative Block Diagram
2
VDD
3
Drive
EXT
5
VOUT
Oscillator
MC33468
VARIABLE FREQUENCY
MICROPOWER DC–to–DC
CONVERTER
SEMICONDUCTOR
TECHNICAL DATA
5
1
N SUFFIX
PLASTIC PACKAGE
CASE 1212
(SOT–23–5)
PIN CONNECTIONS
Ground 1
Vdd 2
EXT 3
5 VOUT
4 N/C
(Top View)
Vref
1 Gnd
MOTOROLA ANALOG IC DEVICE DATA
1


Motorola Electronic Components Datasheet

MC33468 Datasheet

VARIABLE FREQUENCY MICROPOWER DC-to-DC CONVERTER

No Preview Available !

MC33468
MAXIMUM RATINGS (TC = 25°C, unless otherwise noted.)
Rating
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower Supply Voltage (Transient)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower Supply Voltage (Operating)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁExternal Pin Voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁEXT Pin Source/Sink Current
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower Dissipation and Thermal Characteristics
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁN Suffix, Plastic Package Case 1212 (SOT–23–5)
Symbol
VDD
VDD
VEXT
IEXT
Value
12
10
–0.3 to VDD + 0.3
50/50
Unit
V
V
V
mA
Maximum Power Dissipation @ TA = 250°C
Thermal Resistance, Junction–to–Air
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOperating Junction Temperature
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOperating Ambient Temperature
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStorage Temperature Range
PD
RθJA
TJ
TA
Tstg
150
667
125
–40 to +85
–55 to +125
mW
°C/W
°C
°C
°C
ELECTRICAL CHARACTERISTICS (VDD = 1.9 V, TA = 25°C, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max Unit Note1
OSCILLATOR
Frequency
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOscillator Minimum Supply Voltage (IO = 0 mA)
Oscillator Duty Cycle
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁEXT OUTPUT
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁON State Source Current (VEXT = GND)
OFF State Sink Current (VEXT = 1.9 V)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTOTAL DEVICE
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOutput Voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁQuiescent Bias Current (VOUT = 1.9 V, IO = 0 mA)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁQuiescent Bias Current (VOUT = 2.1 V, IO = 0 mA)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInternal Resistor (VOUT to GND)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOutput Voltage Temperature Coefficient
IOUT = 10 mA, –40°C TA 85°C
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1. Indicates test circuits shown on next page.
fosc
VDD
D
Isource
Isink
VOUT
IQ
IQ
RVout
D VOUT
D TA
65
1.5
1.5
1.950
2.0
180
0.7
75
2.000
15
3.0
±50
– kHz B
0.8 V B
– %B
– mA C
– mA D
2.050
25
5.0
V
µA
µA
MW
ppm/oc
A
A
E
Figure 1. Output Voltage versus Output Current
40
Vin = 3.6 V
35
30
25
20
0 20 40 60
IOUT, OUTPUT CURRENT (mA)
Figure 2. Efficiency versus Output Current
80
70
60
50
40
30
Vin = 3.6 V
20
0 20 40 60
IOUT, OUTPUT CURRENT (mA)
© Motorola, Inc. 1999
Rev 1, 09/1999
2 MOTOROLA ANALOG IC DEVICE DATA


Part Number MC33468
Description VARIABLE FREQUENCY MICROPOWER DC-to-DC CONVERTER
Maker Motorola
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MC33468 Datasheet PDF






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