SS6639
1-Cell, 3-Pin, Step-Up DC/DC Controller
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FEATURES
•
•
•
•
•
•
•
•
Guaranteed start-up from less than 0.9 V.
High efficiency.
Low quiescent current.
Fewer external components needed.
Low ripple and low noise.
Fixed output voltage: 2.7, 3.0V, 3.3V, and 5V.
Driver for external transistor.
Space-saving package: SOT-89 and TO-92.
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GENERAL DESCRIPTION
The SS6639 is a high efficiency step-up DC/DC
controller for applications using 1 to 4 battery cells. Only
three external components are required to deliver a
fixed output voltage of 2.7, 3.0V, 3.3V, or 5V. The
SS6639 starts up from less than 0.9V input with a 1mA
load. The Pulse Frequency Modulation scheme offers
optimized performance for applications with light output
loading and low input voltages. The output ripple and
noise are lower than with circuits operating in PSM
mode.
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APPLICATIONS
•
•
•
•
•
•
Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Suppliers.
Portable Instruments.
The PFM control circuit operating up to 100 KHz
switching rate results in smaller passive components.
The space-saving SOT-89 and TO-92 packages make
the SS6639 an ideal choice of DC/DC controller for
space-conscious
applications,
such
as
pagers,
electronic cameras, and wireless microphones.
Using an external transistor driver pin (EXT), the
SS6639 is recommended for applications requiring
currents from several tens to several hundreds of
milliamperes.
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TYPICAL APPLICATION CIRCUIT
VIN
D1
V
OUT
L1
33µH
R1
+
C1
47µF
GS SS14
SS6639-27
SS6639-30
EXT
SS6639-33
SS6639-50
GND
VOUT
*Q1
2SD1803
300
+
C3
100µF
C2
10nF
*Q1: Sanyo 25D1803S-TC 60V/5A/20W
100mA Load Current Step-Up Converter
Rev.2.01 6/26/2003
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SS6639
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ORDERING INFORMATION
SS6639-XXCXXX
PIN CONFIGURATION
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGE TYPE
X: SOT-89
Z: TO-92
OUTPUT VOLTAGE
27: 2.7V
30: 3.0V
33: 3.3V
50: 5.0V
EX: SS6639-27CXTR
à
2.7V Version, in SOT-89 Package in
Tape and Reel Packing
SOT-89
TOP VIEW
1: GND
2: VOUT
3: EXT
1
2
3
TO-92
TOP VIEW
1: GND
2: VOUT
3: EXT
1
2
3
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VOUT Pin) ……………….………………………………………………….12V
EXT pin Voltage ……………………………………………………..……….-0.3V to Vout+0.3V
EXT pin Current …………………………………………………..……………………….± 50mA
Operating Temperature Range
………………………………..……………….-40°C to 85°C
Storage Temperature Range ……………………………………..…………… -65°C to 150
°C
Lead Temperature (Soldering 10 Sec.) ………………………..…………………………260°C
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TEST CIRCUIT
SS6639
2.5V
VOUT
GND
EXT
F
OUT
Oscillator Test Circuit
Rev.2.01 6/26/2003
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SS6639
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ELECTRICAL CHARACTERISTICS
PARAMETER
Oscillator Duty Cycle
(Continued)
TEST CONDITIONS
V
IN
=V
OUT
x 0.95
Measurement of the EXT Pin
Waveform
V
IN
=V
OUT
x 0.95
SYMBOL
MIN.
65
TYP.
75
MAX.
85
UNIT
%
DUTY
Max. Oscillator Freq.
Efficiency
Measurement of the EXT Pin
Waveform
F
OSC
η
80
105
80
130
KHz
%
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TYPICAL PERFORMANCE CHARACTERISTICS
Inductor (L1): 33µH (Pin Type)
Diode
2.80
2.75
Capacitor (C1): 47µF (Tantalum Type)
Transistor (Q1): 2SD1803
90
85
(D1): 1N5819 Schottky Type
Output Voltage (V)
2.70
2.65
2.60
2.55
2.50
2.45
2.40
0
Efficiency (%)
V
I N
= 2.0
V
V
I N
= 1.8V
V
IN
= 1.2
V
V
I N
= 1.5
V
80
75
V
I N
= 2.0V
V
IN
=1.8V
70
65
60
V
I N
= 1.5V
V
I N
= 1.2V
V
IN
= 0.9V
V
I N
=0.9V
50
100
150
200
250
300
350
400
450
500
55
50
0
50
100
150
200
250
300
350
400
450
500
Output Current (mA)
Fig. 1 SS6639-27 Load Regulation (L=33µH)
3.1
3.0
90
Output Current (mA)
Fig. 2 SS6639-27 Efficiency (L=33uH)
V
IN
=2.0V
85
Output Voltage (V)
V
IN
=2.0V
Efficiency (%)
2.9
2.8
2.7
V
IN
=1.2V
V
IN
=1.5V
V
IN
=1.8V
80
V
IN
=1.8V
75
V
IN
=1.5V
70
V
IN
=0.9V
2.6
2.5
2.4
V
IN
=1.2V
65
V
IN
=0.9V
60
0
50
100
150
200
250
300
350
400
450
0
50
100
150
200
250
300
350
400
450
Output Current (mA)
Fig. 3 SS6639-30 Load Regulation (L=33µH)
Output Current (mA)
Fig. 4 SS6639-30 Efficiency (L=33µH)
Rev.2.01 6/26/2003
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SS6639
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TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
3.4
90
3.2
85
Output Voltage (V)
3.0
Efficiency (%)
V
IN
=1.5V
V
IN
=2.0V
80
75
V
IN
=2.0V
2.8
V
IN
=1.2V
2.6
70
V
IN
=1.5V
65
V
IN
=0.9V
0
50
100
150
200
250
300
350
400
2.4
60
0
50
100
150
200
250
300
350
400
Output Current (mA)
Fig. 5 SS6639-33 Loading Regulation (L=33µH)
5.25
5.00
4.75
4.50
4.25
4.00
3.75
3.50
3.25
0
Output Current (mA)
Fig. 6 SS6639-33 Efficiency (L=33µH)
90
85
80
V
IN
=3.0V
V
IN
=1.5V
V
IN
=2.0V
V
IN
=0.9V
V
IN
=1.2V
Output Voltage (V)
V
IN
=2.0V
V
IN
=1.5V
Efficiency (%)
700
V
IN
=3.0V
75
70
65
60
55
50
45
V
IN
=0.9V
V
IN
=1.2V
100
200
300
400
500
600
40
0
100
200
300
400
500
600
700
Output Current (mA)
Fig. 7 SS6639-50 Load Regulation (L=33µH)
2.0
1.8
1.6
1.0
1.2
Output Current (mA)
Fig. 8 SS6639-50 Efficiency (L=33µH)
Output Voltage (V)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
20
40
60
80
100
120
140
160
180
200
Input Voltage (V)
Start up
0.8
Start up
0.6
Hold on
0.4
Hold on
0.2
0.0
0
20
40
Output Current (mA)
Fig. 9 SS6639-27 Start-up & Hold-on Voltage (L=33µH)
Output Current (mA)
60
80
100
120
140
160
Fig. 10 SS6639-30 Start-up & Hold-on Voltage (L=33µH)
Rev.2.01 6/26/2003
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