SS6639-30CXTR [SSC]
1-Cell, 3-Pin, Step-Up DC/DC Controller; 1节， 3芯，升压型DC / DC控制器
| 型号： | SS6639-30CXTR |
| 厂家： | 
SILICON STANDARD CORP. |
| 描述： | 1-Cell, 3-Pin, Step-Up DC/DC Controller |
| 文件： | 总12页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SS6639
1-Cell, 3-Pin, Step-Up DC/DC Controller
FEATURES
GENERAL DESCRIPTION
n
n
n
·
·
·
·
·
·
·
·
Guaranteed start-up from less than 0.9 V.
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.
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.
APPLICATIONS
Pagers.
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.
·
·
·
·
·
·
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Suppliers.
Portable Instruments.
Using an external transistor driver pin (EXT), the
SS6639 is recommended for applications requiring
currents from several tens to several hundreds of
milliamperes.
TYPICAL APPLICATION CIRCUIT
n
V
IN
D1
V
OUT
L1
33mH
+
GS SS14
C1
47mF
SS6639-27
SS6639-30
SS6639-33
SS6639-50
R1
VOUT
EXT
300
*Q1
2SD1803
+
C3
100mF
GND
C2
10nF
*Q1: Sanyo 25D1803S-TC 60V/5A/20W
100mA Load Current Step-Up Converter
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SS6639
ORDERINGINFORMATION
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SS6639-XXCXXX
PIN CONFIGURATION
PACKING TYPE
TR: TAPE & REEL
BG: BAG
SOT-89
TOP VIEW
1: GND
2: VOUT
3: EXT
PACKAGE TYPE
X: SOT-89
Z: TO-92
1
2
3
OUTPUT VOLTAGE
27: 2.7V
TO-92
30: 3.0V
TOP VIEW
1: GND
2: VOUT
3: EXT
33: 3.3V
50: 5.0V
1
2
3
EX: SS6639-27CXTR
à 2.7V Version, in SOT-89 Package in
Tape and Reel Packing
ABSOLUTE MAXIMUM RATINGS
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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
TEST CIRCUIT
SS6639
2.5V
F
VOUT
EXT
OUT
GND
Oscillator Test Circuit
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SS6639
ELECTRICAL CHARACTERISTICS
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(TA=25°C, IO=10mA, unless otherwise specified)
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX. UNIT
SYMBOL
SS6639-27 VIN=1.8V
SS6639-30 VIN=1.8V
SS6639-33 VIN=2.0V
SS6639-50 VIN=3.0V
2.633
2.925
3.218
4.875
2.700
3.000
3.300
5.000
2.767
3.075
3.382
5.125
Output Voltage
VOUT
V
Input Voltage
VIN
VSTART
VHOLD
IIN
8
V
V
0.8
0.9
Start-Up Voltage
Hold-on Voltage
No-Load Input Current
I
I
OUT=1mA, VIN:0® 2V
OUT=1mA, VIN:2® 0V
0.6
V
IOUT=0mA
18
mA
SS6639-27
SS6639-30
SS6639-33
SS6639-50
45
50
60
80
IDD1
mA
mA
Supply Current 1
EXT at no load, VIN=VOUT x 0.95
Measurement of the IC input
current (VOUT Pin)
SS6639-27
SS6639-30
SS6639-33
SS6639-50
7
7
7
7
IDD2
Supply Current 2
EXT at no load, VIN=VOUT + 0.95
Measurement of the IC input
current (VOUT Pin)
SS6639-27
SS6639-30
SS6639-33
SS6639-50
300
200
185
130
EXT “H” On-Resistance
EXT “L” On-Resistance
REXTH
W
W
VEXT=VOUT – 0.4V
SS6639-27
SS6639-30
SS6639-33
SS6639-50
VEXT= 0.4V
110
80
70
REXTL
60
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SS6639
ELECTRICAL CHARACTERISTICS
(Continued)
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PARAMETER
TEST CONDITIONS
VIN=VOUT x 0.95
MIN.
TYP.
MAX. UNIT
SYMBOL
Oscillator Duty Cycle
DUTY
65
75
85
%
Measurement of the EXT Pin
Waveform
VIN=VOUT x 0.95
Max. Oscillator Freq.
Efficiency
FOSC
80
105
80
130
KHz
%
Measurement of the EXT Pin
Waveform
h
TYPICAL PERFORMANCE CHARACTERISTICS
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Inductor (L1): 33mH (Pin Type)
Capacitor (C1): 47mF (Tantalum Type)
Diode (D1): 1N5819 Schottky Type
Transistor (Q1): 2SD1803
2.80
2.75
2.70
90
85
80
75
70
VIN=2.0V
VIN=2.0
2.65
VIN=1.8V
VIN=1.8V
VIN=1.5
2.60
VIN=1.2
VIN=1.5V
VIN=1.2V
2.55
2.50
65
60
55
50
VIN=0.9V
2.45
VIN=0.9V
2.40
50
100
150
200
250
300
350
400
450
500
0
0
50
100
150
200
250
300
350
400
450
500
Output Current (mA)
Fig. 2 SS6639-27 Efficiency (L=33uH)
Output Current (mA)
Fig. 1 SS6639-27 Load Regulation (L=33 H)
3.1
90
3.0
2.9
2.8
2.7
2.6
2.5
2.4
5
8
VIN=2.0V
VIN=2.0V
80
75
70
65
60
VIN=1.8V
VIN=1.5V
VIN=1.2V
VIN=1.8V
VIN=1.5V
VIN=0.9V
VIN=1.2V
VIN=0.9V
50
100
150
200
250
300
350
400
450
0
0
50
100
150
200
250
300
350
400
450
Output Current (mA)
Fig. 4 SS6639-30 Efficiency (L=33 H)
Output Current (mA)
Fig. 3 SS6639-30 Load Regulation (L=33 H)
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SS6639
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
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90
85
80
75
70
65
60
3.4
3.2
3.0
2.8
2.6
2.4
VIN=2.0V
VIN=1.5V
VIN=2.0V
VIN=1.2V
VIN=1.5V
VIN=0.9V
0
50
100
150
200
250
300
350
400
400
700
200
0
50
100
150
200
250
300
350
Output Current (mA)
Fig. 6 SS6639-33 Efficiency (L=33 H)
Output Current (mA)
Fig. 5 SS6639-33 Loading Regulation (L=33 H)
5.25
5.00
4.75
4.50
4.25
4.00
3.75
3.50
3.25
90
85
80
75
70
65
60
55
50
45
40
VIN=3.0V
VIN=3.0V
VIN=2.0V
VIN=1.5V
VIN=1.2V
VIN=2.0V
VIN=0.9V
VIN=1.5V
VIN=0.9V
VIN=1.2V
0
100
200
300
400
500
600
0
100
200
300
400
500
600
700
Output Current (mA)
Output Current (mA)
m
Fig. 7 SS6639-50 Load Regulation (L=33 H)
Fig. 8 SS6639-50 Efficiency (L=33 H)
1.2
1.0
0.8
0.6
0.4
0.2
0.0
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Start up
Hold on
Start up
Hold on
0
20
40
60
80
100
120
140
160
180
0
20
40
60
120
140
160
Output C8u0rrent 1(m00A)
Output Current (mA)
Fig. 10 SS6639-30 Start-up & Hold-on Voltage (L=33 H)
Fig. 9 SS6639-27 Start-up & Hold-on Voltage (L=33mH)
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SS6639
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
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1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Start up
Start up
Hold on
Hold on
0
20
40
60
80
100
120
140
160
0
20
40
60
80
100
120
140
160
Output Current (mA)
Output Current (mA)
Fig. 12 SS6639-50 Start-up & Hold-on Voltage (L=33uH)
Fig. 11 SS6639-33 Start-up & Hold-on Voltage (L=33mH)
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Start up
Start up
Hold on
Hold on
0
20
40
60
80
100
120
140
160
0
20
40
60
80
100
120
140
160
Output Current (mA)
Output Current (mA)
Fig. 13 SS6639-33 Start-up & Hold-on Voltage (L=33mH)
Fig. 14 SS6639-50 Start-up & Hold-on Voltage (L=33uH)
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
135
130
125
120
115
110
105
100
95
VOUT = 5.0V
VOUT = 3.3V
VOUT =5.0V
V
V
OUT = 3.0V
OUT = 2.7V
VOUT = 3.3V
VOUT = 3.0V
V
OUT = 2.7V
90
85
-40
-40
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
Output Current (mA)
Fig. 15 SS6639 Output Voltage vs. Temperature
Output Current (mA)
Fig. 16 SS6639 Switching Frequency vs.Temperature
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SS6639
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
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80
75
80
79
VOUT = 5.0V
VOUT = 3.3V
VOUT
2.7V
VOUT
3.0V
=
=
70
65
60
55
50
45
40
35
30
78
77
76
75
74
73
72
71
70
V
V
OUT = 3.0V
OUT = 2.7V
-40
-20
0
20
40
60
80
100
-40
20
0
20
40
60
80
100
-
°
Temperature ( C)
Output Current (mA)
Fig. 18 SS6639 Supply Current vs. Temperature
Fig. 17 SS6639 Maximum Duty Cycle vs. Temperature
400
360
320
280
240
200
160
120
80
130
120
110
100
90
VOUT = 2.7V
VOUT = 3.0V
VOUT = 2.7V
VOUT = 3.0V
VOUT = 3.3V
OUT = 5.0V
VOUT = 3.3V
OUT = 5.0V
V
V
80
70
60
50
40
-40
40
-40
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
°
Temperature ( C)
Temperature (°C)
Fig. 20 SS6639 EXT "H" On-Resistance
Fig. 19 SS6639 EXT "L" On-Resistance
BLOCK DIAGRAM
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1.25V REF.
VOUT
1M
-
EXT
+
Enable
OSC, 100KHz
GND
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SS6639
PIN DESCRIPTIONS
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Pin 1: GND:
Ground. Must be low impedance;
Pin 3: EXT:
Push-pull driver output for external
power. Switch.
solder directly to ground plane.
Pin 2: VOUT:
IC supply pin. Connect Vout to the
regular output.
APPLICATION INFORMATION
General Description
The SS6639 PFM (pulse frequency modulation)
As the load increases, the output capacitor
discharges faster and the error comparator initiates
cycles sooner, increasing the switching frequency.
The maximum duty cycle ensures adequate time for
energy transfer to the output during the second half
of each cycle. Depending on the circuit, PFM
controllers can operate in either discontinuous mode
or continuous conduction mode. The continuous
conduction mode means that the inductor current
does not ramp to zero during each cycle.
controller IC combines a switch mode regulator, a
push-pull driver, a precision voltage reference, and a
voltage detector in a single monolithic device. It
offers extremely low quiescent current, high
efficiency, and very low gate-threshold voltage to
ensure start-up with low battery voltage (0.8V typ.).
Designed to maximize battery life in portable
products, it minimizes switching losses by only
switching as needed to service the load.
PFM controllers transfer a discrete amount of energy
per cycle and regulate the output voltage by
modulating the switching frequency with a constant
turn-on time. Switching frequency depends on load,
input voltage, and inductor value and can range up
to 100 KHz.
VIN
IIN
ID
IOUT
SW
VOUT
+
EXT
When the output voltage drops, the error comparator
enables the 100 kHz oscillator which turns the
MOSFET on for around 7.5us and off for 2.5ms.
Turning on the MOSFET allows inductor current to
ramp up, storing energy in the magnetic field.
When the MOSFET turns off, the inductor forces
current through the diode to the output capacitor and
the load. As the stored energy is depleted, the
current ramps down until the diode turns off. At this
point, the inductor may ring due to residual energy
and stray capacitance. The output capacitor stores
charge when current flowing through the diode is
high, and releases it when current is low, thereby
maintaining a steady voltage across the load.
Isw
Ico
Discontinuous Conduction Mode
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SS6639
At the boundary between continuous and
discontinuous modes, the output current (IOB) is
determined by
VEXT
VIN
VOUT + VD
1
2
VIN
L
æ
ö
÷
ø
IOB =
*
*
* TON *
(1- x
)
ç
IIN
è
IPK
where VD is the diode drop,
TON
X = (RON + RS) *
L
ISW
RON= Switch turn on resistance, RS= Inductor DC
resistance
Charge Co.
TON = Switch ON time
ID
IOUT
In the discontinuous mode, the switching frequency
(Fsw) is
TDIS
Discharge Co.
VSW
2(L) * (VOUT + VD - VIN) * (IOUT)
FSW =
* (1+ x)
2
2
VIN * TON
t
In the continuous mode, the switching frequency is
*
1
VOUT + VD - VIN
fsw =
TON (VOUT + VD - VSW)
Discontinuous Conduction Mode
x
VIN - VSW
2 VOUT + VD - VSW
VOUT + VD - VIN
* [1+
(
)]
1
æ
ö
VEXT
@
*
ç
÷
è
VOUT + VD - VSW ø
TON
where Vsw = switch drop and is proportional to
output current.
IIN
IPK
INDUCTOR SELECTION
To operate as an efficient energy transfer element,
the inductor must fulfill three requirements. First, the
inductance must be low enough for the inductor to
store adequate energy under the worst case
condition of minimum input voltage and switch ON
time. Second, the inductance must also be high
enough so the maximum current rating of the
SS6639 and the inductor are not exceeded at the
other worst case condition of maximum input voltage
and ON time. Lastly, the inductor must have
sufficiently low DC resistance so excessive power is
not lost as heat in the windings. Unfortunately this is
inversely related to physical size.
ISW
ID
IOUT
VSW
t
Continuous Conduction Mode
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SS6639
Minimum and maximum input voltage, output voltage
and output current must be established before an
inductor can be selected.
Power required from the inductor per cycle must be
equal to, or greater than
PL
1
= (VOUT + VD - VIN) * (IOUT) * (
)
fSW
fsw
In discontinuous mode operation, at the end of the
switch ON time, peak current and energy in the
inductor build according to
in order for the converter to regulate the output.
When the loading exceeds IOB, the PFM controller
operates in continuous mode. Inductor peak current
can be derived from
VIN
RON + RS ø è
RON + RS
æ
ö æ
* 1- exp(-
÷ ç
ö
÷
ø
IPK =
* TON)
ç
L
è
VIN
L
x
æ
ö
æ
ö
÷
ø
VOUT + VD - VSW
x
æ
ö
÷
@
*
(
TON
)
* 1-
ç
÷
ç
IPK =
-
ç
è
2
è
ø
è
VIN - VSW
2
ø
VIN
VIN - VSW
x
æ
ö
÷
ø
æ
ö
÷
ø
@
* TON
* IOUT +
* TON * 1-
ç
ç
L
2L
2
è
è
(simple lossless equation), where
TON
Valley current (Iv) is
VOUT + VD - VSW
X = (RON + RS) *
L
x
æ
ö
÷
ø
IV =
-
* IOUT
ç
1
2
VIN - VSW
2
EL = L * IPK
è
2
VIN - VDE
x
æ
ö
÷
ø
æ
ö
÷
ø
*
* TON * 1-
ç
ç
2L
2
è
è
Table 1 Indicates resistance and height for each coil.
Power Inductor Type
Inductance ( mH ) Resistance ( W ) Rated Current (A) height (mm)
47
0.25
0.7
Sumida SMT Type CD54
4.5
4.5
100
0.50
0.5
47
100
33
0.25
0.50
0.11
40m
0.7
0.5
1.2
2
Hold SMT Type PM54
Hold SMT Type PM75
5.0
Huan Feng PIN Type V0810
33
10.0
CAPACITOR SELECTION
A poor choice for an output capacitor can result in poor
efficiency and high output ripple. Ordinary aluminum
electrolytic capacitors, while inexpensive, may have
unacceptably poor ESR and ESL. There are low ESR
aluminum capacitors for switch mode DC-DC
converters which work much better than
general-purpose components. Tantalum capacitors
provide still better performance but are more
expensive. OS-CON capacitors have extremely low
ESR in a small size. If the capacitance is reduced, the
output ripple will increase.
As most of the input supply is applied across the input
bypass capacitor, the capacitor voltage rating should
be at least 1.25 times greater than the maximum input
voltage.
DIODE SELECTION
Speed, forward drop, and leakage current are three
main considerations in selecting a rectifier diode. The
best performance is obtained with a Schottky rectifier
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SS6639
where POUT=VOUT * IOUT ; RS=Inductor DC R;
diode such as the 1N5819. Motorola makes the
MBR0530 for surface mount. For lower output power a
1N4148 can be used although efficiency and start-up
voltage will suffer substantially.
VD = Diode drop.
The power dissipated in switching losses is
2
3
TON
æ
ö
÷
ø
PDsw =
*
*
(
RON
)
*
(
IOUT * (POUT )
)
ç
L
è
COMPONENT POWER DISSIPATION
Operating in discontinuous mode, the power loss in
the winding resistance of the inductor is approximately
equal to
The power dissipated in the rectifier diode is
VD
æ
ö
÷
ø
PDD =
*
(POUT
)
ç
VOUT
è
2
3
TON
VOUT +VD
æ
æ
ö
÷
ø
ö
÷
ø
PDL
=
*
*
(RS
)
*
*
(POUT
)
ç
ç
L
VOUT
è
è
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SS6639
PHYSICAL DIMENSIONS
n
· SOT-89 (unit: mm)
A
D
SYMBOL
MIN
1.40
0.36
0.35
4.40
1.62
2.29
MAX
1.60
0.48
0.44
4.60
1.83
2.60
D1
A
B
C
C
D
H
E
D1
E
L
e
1.50 (TYP.)
3.00 (TYP.)
B
e
e1
H
e1
3.94
0.89
4.25
1.20
L
SOT-89 MARKING
l
Part No.
Marking
AU27
AU30
AU33
AU50
SS6639-27
SS6639-30
SS6639-33
SS6639-50
· TO-92 (unit: mm)
SYMBOL
MIN
4.32
MAX
5.33
E
L
A
A
C
D
E
C
0.38 (TYP.)
e1
4.40
3.17
5.20
4.20
D
e1
L
1.27 (TYP.)
12.7
-
Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no
guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no
responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its
use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including
without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to
the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of
Silicon Standard Corporation or any third parties.
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相关型号：
SS6639U
Rectifier Diode, 1 Element, 0.3A, Silicon, DO-35, HERMETIC SEALED, GLASS PACKAGE-2
SENSITRON
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