ST5R50 [ETC]
MICROPOWER VFM STPE-UP DC/DC CONVERTER ; 微功耗VFM STPE型DC / DC转换器\n
| 型号： | ST5R50 |
| 厂家： | 
ETC |
| 描述： | MICROPOWER VFM STPE-UP DC/DC CONVERTER
|
| 文件： | 总15页 (文件大小：555K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ST5R00
SERIES
MICROPOWER VFM STEP-UP DC/DC CONVERTER
■
■
■
VERY LOW SUPPLY CURRENT
REGULATED OUTPUT VOLTAGE
WIDE RANGE OF OUTPUT VOLTAGE
AVAILABLE (2.5V, 2.8V, 3.0V, 3.3V, 5.0V)
OUTPUT VOLTAGE ACCURACY ±5%
OUTPUT CURRENT UP TO 100mA
LOW RIPPLE AND LOW NOISE
VERY LOW START-UP VOLTAGE
■
■
■
■
■
■
■
SOT23-5L
SOT-89
HIGH EFFICIENCY (V
= 5V TYP. 87%)
OUT
FEW EXTERNAL COMPONENTS
VERY SMALL PACKAGE: SOT23-5L, SOT-89
the use of small, low cost inductors. Only three
external components are needed: an inductor a
diode and an output capacitor.
The ST5R00 is suitable to be used in a battery
powered equipment where low noise, low ripple
and ultra low supply current are required. The
ST5R00 is available in very small packages:
SOT23-5L, SOT-89.
Typical applications are pagers, cameras & video
camera, cellular telephones, wireless telephones,
palmtop computer, battery backup supplies,
battery powered equipment.
DESCRIPTION
The ST5R00 is an high efficiency VFM Step-up
DC/DC converter for small, low input voltage or
battery powered systems with ultra low quiescent
supply current. The ST5Rxx accept a positive
input voltage from start-up voltage to V
convert it to a higher output voltage in the 2.5 to
and
OUT
5V range.
The ST5R00 combine ultra low quiescent supply
current and high efficiency to give maximum
battery life. The high switching frequency and the
internally limited peak inductor current, permits
SCHEMATIC DIAGRAM
October 2003
1/15
ST5R00 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
Output Voltage
Input Voltage
5.5
5.5
V
V
V
OUT
V
IN
LX
LX
V
LX Pin Voltage
LX Pin Output Current
5.5
I
Internally limited
170 (*)
P
T
Power Dissipation at 25°C for SOT23-5L
Storage Temperature Range
mW
°C
TOT
-55 to 125
-25 to 85
STG
T
Operating Junction Temperature Range
°C
OP
(*) Reduced by 1.7 mW for increasing in T of 1°C over 25°C
A
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
Parameter
SOT23-5L
SOT-89
Unit
R
Thermal Resistance Junction-case
63
17
°C/W
thj-case
OPERATION
The ST5Rxx architecture is built around a VFM CONTROL logic core: switching frequency is set through
a built in oscillator: T time is fixed (Typ. 5ms) while T time is determined by the error amplifier
ON
OFF
output, a logic signal coming from the comparison made by the Error Amplifier Stage between the signal
coming from the output voltage divider network and the internal Band-Gap voltage reference (V ). T
ref
OFF
reaches a minimum (Typ. 1.7ms) when heavy load conditions are met (Clock frequency 150KHz). An over
current conditions, through the internal power switch, causes a voltage drop V =R xI and the V
LX
DSON SW
LX
limiter block forces the internal switch to be off, so narrowing T
time and limiting internal power
ON
dissipation. In this case the switching frequency may be higher than the 150KHz set by the internal clock
generator.
VFM control ensures very low quiescent current and high conversion efficiency even with very light loads.
Since the Output Voltage pin is also used as the device Supply Voltage, the versions with higher output
voltage present an higher internal supply voltage that results in lower power switch R
, slightly greater
DSON
output power and higher efficiency. Moreover, bootstrapping allows the input voltage to sag to 0.6V (at
=1mA) once the system is started.
I
OUT
If the input voltage exceeds the output voltage, the output will follow the input, however, the input or output
voltage must not be forced above 5.5V.
Typical Application Circuit
Typical Application Efficiency
(*) See application info.
2/15
ST5R00 SERIES
CONNECTION DIAGRAM (top view)
SOT23-5L
SOT-89
ORDERING CODES
SOT23-5L
SOT-89
OUTPUT VOLTAGES
ST5R25M
ST5R28M
ST5R30M
ST5R33M
ST5R50M
ST5R25U
ST5R28U
ST5R30U
ST5R33U
ST5R50U
2.5 V
2.8 V
3.0 V
3.3 V
5.0 V
TYPICAL DEMOBOARD
Note: drawing not in scale.
3/15
ST5R00 SERIES
ELECTRICAL CHARACTERISTICS FOR ST5R25
(V = 1.5V, I
= 10mA, T = 25°C, unless otherwise specified. For external components value, unless
IN
OUT
A
otherwise notes, refer to the typical operating circuit.)
Symbol
Parameter
Output Voltage
Test Conditions
Min.
Typ.
2.5
Max.
2.625
1.2
Unit
V
V
2.375
OUT
V
Start-up Voltage (V -V ) (1)
I
I
= 1mA, V = rising from 0 to 2V
0.8
V
START-UP
IN
F
OUT
OUT
IN
V
Hold-on Voltage
Supply Current
Internal Switch R
= 1mA, V = falling from 2 to 0V
0.6
V
HOLD
IN
I
To be measured at V , no load
16
µA
mΩ
µA
KHz
%
SUPPLY
IN
R
I = 150mA
LX
850
LX(DSON)
DSON
I
Internal Leakage Current
Maximum oscillator Frequency
Oscillator Duty Cycle
V
= 4V, forced V = 3V
OUT
0.5
LX(leak)
LX
f
150
77
OSC
D
to be measure on LX pin
= 50mA
ty
ν
Output Noise Voltage
I
82
%
OUT
(1): The minimum input voltage for the IC start-up is strictly a function of the V catch diode.
F
ELECTRICAL CHARACTERISTICS FOR ST5R28
(V = 1.7V, I
= 10mA, T = 25°C, unless otherwise specified. For external components value, unless
IN
OUT
A
otherwise notes, refer to the typical operating circuit.)
Symbol
Parameter
Output Voltage
Test Conditions
Min.
Typ.
2.8
Max.
2.94
1.2
Unit
V
V
2.66
OUT
V
Start-up Voltage (V -V ) (1)
I
I
= 1mA, V = rising from 0 to 2V
0.8
V
START-UP
IN
F
OUT
OUT
IN
V
Hold-on Voltage
Supply Current
Internal Switch R
= 1mA, V = falling from 2 to 0V
0.6
V
HOLD
IN
I
To be measured at V , no load
16
µA
mΩ
µA
KHz
%
SUPPLY
IN
R
I = 150mA
LX
850
LX(DSON)
DSON
I
Internal Leakage Current
Maximum oscillator Frequency
Oscillator Duty Cycle
V
= 4V, forced V = 3.3V
OUT
0.5
LX(leak)
LX
f
150
77
OSC
D
to be measure on LX pin
= 50mA
ty
ν
Output Noise Voltage
I
82
%
OUT
(1): The minimum input voltage for the IC start-up is strictly a function of the V catch diode.
F
ELECTRICAL CHARACTERISTICS FOR ST5R30
(V = 1.8V, I
= 10mA, T = 25°C, unless otherwise specified. For external components value, unless
IN
OUT
A
otherwise notes, refer to the typical operating circuit.)
Symbol
Parameter
Output Voltage
Test Conditions
Min.
Typ.
3
Max.
3.15
1.2
Unit
V
V
2.85
OUT
V
Start-up Voltage (V -V ) (1)
I
I
= 1mA, V = rising from 0 to 2V
0.8
V
START-UP
IN
F
OUT
OUT
IN
V
Hold-on Voltage
Supply Current
Internal Switch R
= 1mA, V = falling from 2 to 0V
0.6
V
HOLD
IN
I
To be measured at V , no load
17
µA
mΩ
µA
KHz
%
SUPPLY
IN
R
I = 150mA
LX
850
LX(DSON)
DSON
I
Internal Leakage Current
Maximum oscillator Frequency
Oscillator Duty Cycle
V
= 4V, forced V = 3.5V
OUT
0.5
LX(leak)
LX
f
150
77
OSC
D
to be measure on LX pin
= 50mA
ty
ν
Output Noise Voltage
I
82
%
OUT
(1): The minimum input voltage for the IC start-up is strictly a function of the V catch diode.
F
4/15
ST5R00 SERIES
ELECTRICAL CHARACTERISTICS FOR ST5R33
(V = 2V, I = 10mA, T = 25°C, unless otherwise specified. For external components value, unless
IN
OUT
A
otherwise notes, refer to the typical operating circuit.)
Symbol
Parameter
Output Voltage
Test Conditions
Min.
Typ.
3.3
Max.
3.465
1.2
Unit
V
V
3.135
OUT
V
Start-up Voltage (V -V ) (1)
I
I
= 1mA, V = rising from 0 to 2V
0.8
V
START-UP
IN
F
OUT
OUT
IN
V
Hold-on Voltage
Supply Current
Internal Switch R
= 1mA, V = falling from 2 to 0V
0.6
V
HOLD
IN
I
To be measured at V , no load
17
µA
mΩ
µA
KHz
%
SUPPLY
IN
R
I = 150mA
LX
850
LX(DSON)
DSON
I
Internal Leakage Current
Maximum oscillator Frequency
Oscillator Duty Cycle
V
= 4V, forced V = 3.8V
OUT
0.5
LX(leak)
LX
f
150
77
OSC
D
to be measure on LX pin
= 50mA
ty
ν
Output Noise Voltage
I
83
%
OUT
(1): The minimum input voltage for the IC start-up is strictly a function of the V catch diode.
F
ELECTRICAL CHARACTERISTICS FOR ST5R50
(V = 3V, I
= 10mA, T = 25°C, unless otherwise specified. For external components value, unless
IN
OUT
A
otherwise notes, refer to the typical operating circuit.)
Symbol
Parameter
Output Voltage
Test Conditions
Min.
Typ.
5.0
Max.
5.25
1.2
Unit
V
V
4.75
OUT
V
Start-up Voltage (V -V ) (1)
I
I
= 1mA, V = rising from 0 to 2V
0.8
V
START-UP
IN
F
OUT
OUT
IN
V
Hold-on Voltage
Supply Current
Internal Switch R
= 1mA, V = falling from 2 to 0V
0.6
V
HOLD
IN
I
To be measured at V , no load
18
µA
mΩ
µA
KHz
%
SUPPLY
IN
R
I = 150mA
LX
700
LX(DSON)
DSON
I
Internal Leakage Current
Maximum oscillator Frequency
Oscillator Duty Cycle
V
= 4V, forced V = 3.8V
OUT
0.5
LX(leak)
LX
f
160
77
OSC
D
to be measure on LX pin
= 50mA
ty
ν
Output Noise Voltage
I
87
%
OUT
(1): The minimum input voltage for the IC start-up is strictly a function of the V catch diode.
F
TYPICAL PERFORMANCE CHARACTERISTICS (the following plots are referred to the typical
application circuit and, unless otherwise noted, at T = 25°C)
A
Figure 1 : Output Voltage vs Output Current
Figure 2 : Output Voltage vs Output Current
5/15
ST5R00 SERIES
Figure 3 : Output Voltage vs Temperature
Figure 6 : Efficiency vs Temperature
Figure 7 : Efficiency vs Output Current
Figure 8 : Efficiency vs Output Current
Figure 4 : Output Voltage vs Temperature
Figure 5 : Efficiency vs Temperature
6/15
ST5R00 SERIES
Figure 9 : Maximum Oscillator Frequency vs
Figure 12 : Oscillator Duty Cycle (@ MAX Freq.)
Temperature
vs Temperature
Figure 10 : Maximum Oscillator Frequency vs
Figure 13 : LX Switching Current Limit vs
Temperature
Temperature
Figure 11 : Oscillator Duty Cycle (@ MAX Freq.)
Figure 14 : LX Switching Current Limit vs
vs Temperature
Temperature
7/15
ST5R00 SERIES
Figure 15 : Start-up Voltage (V - V ) vs
Figure 18 : Start-up Voltage (V - V ) vs
IN F
IN
F
Temperature
Output Current
Figure 16 : Start-up Voltage (V - V ) vs
Figure 19 : Minimum Input Voltage vs Output
IN
F
Temperature
Current
Figure 17 : Start-up Voltage (V - V ) vs
Figure 20 : Minimum Input Voltage vs Output
IN
F
Output Current
Current
8/15
ST5R00 SERIES
Figure 21 : Internal Switch R
vs
Figure 24 : Hold-on Voltage vs Temperature
DSON
Temperature
Figure 22 : Internal Switch R
vs
Figure 25 : No Load Input Current vs
DSON
Temperature
Temperature
Figure 23 : Hold-on Voltage vs Temperature
Figure 26 : No Load Input Current vs
Temperature
9/15
ST5R00 SERIES
APPLICATION INFORMATION
PC LAYOUT AND GROUNDING HINTS
The ST5R00 high frequency operation makes PC layout important for minimizing ground bounce and
noise. Place external components as close as possible to the device pins. Take care to the Supply
Voltage Source connections that have to be very close to the Input of the application. Set the Output Load
as close as possible to the output capacitor. If possible, use a Star ground connection with the centre point
on the Device Ground pin. To maximize output power and efficiency and minimize output ripple voltage,
use a ground plane and solder the ICs ground pin directly to the ground plane.
Remember that the LX Switching Current flows through the Ground pin, so, in order to minimize the series
resistance that may cause power dissipation and decrease of the Efficiency conversion, the Ground
pattern has to be as large as possible.
INDUCTOR SELECTION
An inductor value of 47µH performs well in most ST5R00 applications. However, the inductance value is
not critical, and the ST5R00 will work with inductors in the 33µH to 120µH. Smaller inductance values
typically offer a smaller physical size for a given series resistance, allowing the smallest overall circuit
dimensions. However, due to higher peak inductor currents, the output voltage ripple (Ipeak x output filter
capacitors ESR) also tends to be higher. Circuits using larger inductance values exhibit higher output
current capability and larger physical dimensions for a given series resistance.
In order to obtain the best application performances the inductor must respect the following condition:
- The DC resistance has to be as little as possible, a good value is <0.25Ω. This choice will reduce the lost
power as heat in the windings.
- The inductor core must not saturate at the forecast maximum LX current. This is mainly a function of the
Input Voltage, Inductor value and Output Current. However, it is generally acceptable to bias the inductor
into saturation by as much as 20%, although this will slightly reduce efficiency. In order to calculate this
parameter we have to distinguish two cases:
1) When a light load is applied on the output (discontinuous mode operation) the inductor core must not
saturate at
I
= (V x T )/L.
LX(max)
IN ON
2) For heavy load (continuos mode operation) the inductor core must not saturate at
= (I x T)/T + (V x T )/2L
I
LX(max)
OUT
OFF(min)
IN
ON
Where: V is the Input Voltage, Ton is the switch on period (typ. 5ms), L is the inductance value,
IN
I
is the maximum forecast Output Current, T = T +T
and T
is the minimum switch off
OUT
ON
OFF(min)
OFF(min)
period (typ. 1.7µs),
- Choose an inductance value in the 47µH to 82µH range.
- For application sensitive to Electromagnetic Interference (EMI), a pot core inductor is recommended.
DIODE SELECTION
A Schottky diode with an high switching speed and a very low Forward Voltage (V ) is needed. Higher V
F
F
may cause lost power as heat in the diode, with a decrease of the Efficiency. Moreover, since the Output
Voltage pin is also used as the device Supply Voltage, the Start-up Voltage (see related plots) is strictly
due to the diode Forward Voltage at the rated Forward Current. A good diode choice is a STPS1L30A.
INPUT/OUTPUT CAPACITORS SELECTION
The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior of these elements.
The output ripple voltage is the product of the peak inductor current and the output capacitor Equivalent
Series Resistance (ESR). Best performances are obtained with good high frequency characteristics
capacitors and low ESR. The best compromise for the value of the Output Capacitance is 47µF Tantalum
Capacitor, Lower values may cause higher Output Ripple Voltage and lower Efficiency without
compromising the functionality of the device.
An Input Capacitor is required to compensate, if present, the series impedance between the Supply
Voltage Source and the Input Voltage of the Application.
A value of 4.7µF is enough to guarantee stability for distances less than 2". It could be necessary
(depending on V , V
, I
values) to proportionally increase the input capacitor value up to 100µA for
IN OUT OUT
major distances.
In any case we suggest to connect both capacitors, C and C
, as close as possible to the device pins.
OUT
IN
10/15
ST5R00 SERIES
SOT23-5L MECHANICAL DATA
mm.
mils
DIM.
MIN.
0.90
0.00
0.90
0.35
0.09
2.80
1.50
TYP
MAX.
1.45
0.10
1.30
0.50
0.20
3.00
1.75
MIN.
35.4
0.0
TYP.
MAX.
57.1
3.9
A
A1
A2
b
35.4
13.7
3.5
51.2
19.7
7.8
C
D
E
110.2
59.0
118.1
68.8
e
0.95
37.4
H
L
2.60
0.10
3.00
0.60
102.3
3.9
118.1
23.6
.
7049676C
11/15
ST5R00 SERIES
SOT-89 MECHANICAL DATA
mm.
mils
TYP.
DIM.
MIN.
1.4
TYP
MAX.
1.6
MIN.
55.1
17.3
14.2
13.8
13.8
173.2
63.8
90.2
55.9
115.0
155.1
35.0
MAX.
63.0
A
B
0.44
0.36
0.35
0.35
4.4
0.56
0.48
0.44
0.44
4.6
22.0
B1
C
18.9
17.3
C1
D
17.3
181.1
72.0
D1
E
1.62
2.29
1.42
2.92
3.94
0.89
1.83
2.6
102.4
61.8
e
1.57
3.07
4.25
1.2
e1
H
120.9
167.3
47.2
L
P025H
12/15
ST5R00 SERIES
Tape & Reel SOT23-xL MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
180
MIN.
MAX.
7.086
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
14.4
3.33
3.27
1.47
4.1
0.567
0.131
0.128
0.0.58
0.161
0.161
Ao
Bo
Ko
Po
P
3.13
3.07
1.27
3.9
3.23
3.17
1.37
4.0
0.123
0.120
0.050
0.153
0.153
0.127
0.124
0.054
0.157
0.157
3.9
4.0
4.1
13/15
ST5R00 SERIES
Tape & Reel SOT89 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
180
MIN.
MAX.
7.086
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
14.4
4.90
4.50
1.90
4.1
0.567
0.193
0.177
0.075
0.161
0.319
Ao
Bo
Ko
Po
P
4.70
4.30
1.70
3.9
4.80
4.40
1.80
4.0
0.185
0.169
0.067
0.153
0.311
0.189
0.173
0.071
0.157
0.315
7.9
8.0
8.1
14/15
ST5R00 SERIES
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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All other names are the property of their respective owners
© 2003 STMicroelectronics - All Rights Reserved
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