S1F71200M0A0 [SEIKO]
SWITCHING CONTROLLER, 280 kHz SWITCHING FREQ-MAX, PDSO16, PLASTIC, SSOP2-16;
| 型号： | S1F71200M0A0 |
| 厂家： | 
SEIKO EPSON CORPORATION |
| 描述： | SWITCHING CONTROLLER, 280 kHz SWITCHING FREQ-MAX, PDSO16, PLASTIC, SSOP2-16 开关 光电二极管 |
| 文件： | 总14页 (文件大小：102K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MF302-12
S1F71200 Technical Manual
S1F71200 Series PWM Type Step-up/down DC/DC
Switching Regulator
DESCRIPTION
FEATURES
• Input voltage
• Output voltage
S1F71200 is a step-up/step-down DC/DC converter
control IC for which the CMOS process is used and to
which a power transistor is connected outside.
S1F71200 is composed of an oscillator, a reference
voltage circuit, an error amplifier, a PWM circuit, a se-
ries regulator, a driver, etc. When this IC drives an ex-
ternal power transistor, S1F71200 can constitute a step-
up/step-down DC/DC converter that operates as a [step-
down] series regulator when the input voltage is High
and that operates as a [step-up] switching regulator of
pulse width modulation system (PWM) when the input
voltage is Low.
: 2.5V to 12.0V
: 5.0V (S1F71200M0A0)
3.3V (S1F71200M0B0)
: 1.0µA
• Power off current
• Self current consumption : 150µA
(step-up portion)
15µA
(step-down portion)
• Frequency fixing (200kHz) PWM at step-up time
• Power off function (IC shutdown)
• Soft start function
• Overcurrent protection function
S1F71200 is also provided with an overcurrent protec-
tion circuit and a soft start circuit. When receiving ex-
ternal signals, S1F71200 can stop the oscillator and the
switching circuit and turn off the power, so that it can
reduce wasteful current consumption at the time of sys-
tem halt.
• Shipping pattern
: plastic package
(SSOP2-16 pin)
* Radiation-resistant design has not been provided for
this specification.
S1F70000 Series
Technical Manual
EPSON
4–41
S1F71200 Series
BLOCK DIAGRAM
Driver
Oscillator
SWO
Overcurrent detection
V
DD1
DD2
circuit
_
I
SENSE
PWM
+
V
SSC
Soft start
_
+
VSS
EXO
Series regulator
V
SW
VO
SWC
+
_
SRC
Error amplifier
VC
I
REF
REF
Reference
voltage
circuit
POFFX
V
4–42
EPSON
S1F70000 Series
Technical Manual
S1F71200 Series
PIN ASSIGNMENTS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Index
SSOP2–16pin
S1F70000 Series
Technical Manual
EPSON
4–43
S1F71200 Series
PIN DESCRIPTIONS
Pin No. Pin name
Pin type
Power system
Description
1
VDD1
Power supply
VDD1
Power pin 1 (+), Input power pin
Power pin 2 (+), Power pin for series regulator
circuit
2
VDD2
Power supply
VDD2
3
4
EXO
VO
Output
—
VDD2
PNP transistor base drive pin for series regulator
Step-up/step-down output feedback pin
—
Series regulator phase compensation capaci-
tor connection pin
5
6
SRC
—
—
Reference resistor connection pin. Connect a
100kΩ resistor between the VSS pins.
IREF
Output
VDD1
Reference voltage pin. Connect a 0.1µF
capacitance between the VSS pins.
7
8
VREF
Output
—
VDD1
(N.C)
—
No connection
Power off control pin.
9
POFFX
Input
VDD1
During normal operation : POFFX = VDD1
At power off time
: POFFX = VSS
Step-up output voltage setting pin.
10
11
VC
Input
—
VDD1
For setting VSW = VO + 1.0V : VC = VDD1
For setting VSW = VO + 0.5V : VC = VSS
Switching regulator phase compensation
capacitor connection pin
SWC
—
12
13
14
15
16
VSW
VSS
—
—
—
Step-up output feedback pin
—
Power pin (–), Ground pin
SSC
—
VDD1
VDD1
VDD1
Capacitor connection pin for soft start
Overcurrent detection pin
ISENSE
SWO
Input
Output
Step-up switching power transistor drive pin
4–44
EPSON
S1F70000 Series
Technical Manual
S1F71200 Series
FUNCTIONAL DESCRIPTIONS
Description of Operation
Step-up Set Voltage
Step-up set voltage can be selected at the VC pin.
1VC = High VDD1 level
S1F71200 is a switching regulator (step-up) and series
regulator (step-down) control IC of pulse width modu-
lation (PWM) system. When external parts such as
transistor, inductor, capacitor, diode and resistor are
connected, S1F71200 can constitute a step-up/step-
down DC/DC converter.
When the input voltage is lower than the specified volt-
age value, S1F71200 raises the voltage to the set volt-
age (selectable at the VC pin) with the switching regula-
tor and lowers the step-up voltage with the series regu-
lator to stabilize the output voltage. On the other hand,
when the input voltage is higher than the specified volt-
age value, S1F71200 stops the operation of the switch-
ing regulator (step-up) and operates the series regulator
(step-down) only. Switching operations with input
voltage makes constant voltage outputs possible all the
time.
:
Step-up set voltage = 6.0V (S1F71200M0A0)
4.3V (S1F71200M0B0)
2VC = Low VSS level :
Step-up set voltage = 5.5V (S1F71200M0A0)
3.8V (S1F71200M0B0)
In case of output stability and heavy load like ripple, 1
is superior, bur for the conversion efficiency at step-up
operation, 2is superior. Characteristics vary with ap-
plicable external parts or voltage and load conditions.
So, select a proper voltage after sufficient evaluation.
The VC pin cannot be used in the open state.
Soft Start
When a capacitor is connected to the SSCAP pin,
S1F71200 can set a soft start operation to prevent inrush
current at the time when the power is turned on. The
SSCAP pin is at the VSS level when the power is turned
off (POFFX=VSS). When the operation state is set
(POFFX=VDD1), the soft start capacitor starts being
charged and the voltage at the SSCAP pin rises slowly.
The step-up output voltage rises gradually as the volt-
age at the SSCAP pin rises. This operation is carried
out when the power is turned on, when the power off is
released or when the overcurrent detection is released
and restrains surge current and output overshoot.
Operation of Switching Regulator
S1F71200 monitors voltage at the VSW pin, i.e., the out-
put voltage of the step-up switching regulator, and con-
trols pulse width of the switching transistor. When the
voltage at the VSW pin drops below the step-up set volt-
age, S1F71200 changes the output level of the error am-
plifier and increases the on duty of the switching
transistor for control.
On the other hand, when the voltage at the VSW pin rises
over the step-up set voltage, S1F71200 reduces the on
duty for control. When voltages higher than the step-up
set voltage is constantly supplied to the VSW pin,
S1F71200 stops operation of the step-up switching.
When the switching stops completely, the input voltage
is supplied to the VSW pin through the coil and the di-
ode. (The voltage at the VSW pin comes to the one ob-
tained by reducing VF of the diode from the input volt-
age.)
S1F70000 Series
Technical Manual
EPSON
4–45
S1F71200 Series
Overcurrent Protection Circuit
Power Off Function
The overcurrent protection circuit functions when an
overcurrent flows through the current detection resistor
during the step-up operation and the voltage at the
ISENSE pin rises over the set voltage value. When the
overcurrent protection function works, the transistor
drive pin SWO comes to the VSS level and the switch-
ing transistor is turned off. Since the overcurrent pro-
tection circuit links to the soft start circuit, it drops the
voltage at the SSCAP pin to the VSS level during
overcurrent detection. When the overcurrent detection
is released, the voltage at the SSCAP pin rises slowly
and the soft start operation starts.
Power lost at the current detection resistor becomes a
factor of lower efficiency. When the overcurrent pro-
tection circuit is not necessary, short-circuit the ISENSE
pin to the VSS pin. The ISENSE pin cannot be used in an
open state.
S1F71200 can control circuit operations according to
external signal control. When the POFFX pin is set to
the VSS level, all circuits stop and their powers are
turned off. The current consumption at the power off
state is less than 1µA. When the power is off, the SWO
pin is set to the VDD level, the EXO pin is set to the
VDD2 level and respective external transistors are
turned.
The voltage at the SSCAP pin comes to the VSS level,
and the soft start circuit controls the step-up operation
output voltage is controlled with the soft start circuit af-
ter the power off state is released. The soft start circuit
controls step-up operations after power off release.
When being set to the VDD level, the POFFX pin oper-
ates in general. The POFFX pin cannot be used in an
open state. When the power off function is not used,
connect the POFFX pin to the VDD1 pin.
Operation of Series Regulator
S1F71200 has a built-in series regulator control circuit.
When driving the PNP transistor as an external part,
S1F71200 reduces voltage supplied to the VDD2 pin and
constitutes a series regulator. The VDD2 pin is generally
connected to the VSW pin of step-up output.
This series regulator operates monitoring voltage at the
VO pin of step-up/step-down output. It controls the
drive current (base current of the PNP transistor) at the
EXO pin to stabilize voltage at the VO pin.
4–46
EPSON
S1F70000 Series
Technical Manual
S1F71200 Series
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Applicable Pin
Rating
Unit
VDD1
VDD2
Input voltage
VDD
15.0
V
Voltage at EXO pin
Voltage at VO pin
Voltage at SRC pin
Voltage at IREF pin
Voltage at VREF pin
Voltage at POFFX pin
Voltage at VC pin
Voltage at SWC pin
Voltage at VSW pin
Voltage at SSC pin
ISENSE
EXO
VO
EXO
VO
VSS – 0.3 to VDD2 + 0.3
VSS – 0.3 to 15
V
V
V
V
V
V
V
V
V
V
V
V
SRC
IREF
SRC
IREF
VSS – 0.3 to 15
VSS – 0.3 to VDD1 + 0.3
VSS – 0.3 to VDD1 + 0.3
VSS – 0.3 to VDD1 + 0.3
VSS – 0.3 to VDD1 + 0.3
VSS – 0.3 to 15
VREF
POFFX
VC
VREF
POFFX
VC
SWC
VSW
SWC
VSW
VSS – 0.3 to 15
SSC
ISENSE
SWO
SSC
ISENSE
SWO
VSS – 0.3 to VDD1 + 0.3
VSS – 0.3 to VDD1 + 0.3
VSS – 0.3 to VDD1 + 0.3
SWO
210
Ta ≤ 25°C
Package allowable loss
PD
PD
MW
Operating temperature
Topr
Tstg
Tsol
—
—
—
–30 to +85
–55 to +150
260 · 10
°C
°C
Storage temperature
Soldering temperature and time
°C · s
Note
Any operation under conditions exceeding the above absolute maximum ratings may result in a malfunction or a
permanent destruction. When even an item is more than the rating, a temporary normal operation is possible but
with remarkably low reliability. So, be sure to keep all items below the ratings.
S1F70000 Series
Technical Manual
EPSON
4–47
S1F71200 Series
ELECTRICAL CHARACTERISTICS
S1F71200M0A0 (Output : 5.0V)
DC Characteristics
Unless otherwise specified, Ta = 25°C.
Rating
Unit
Parameter
Symbol
Conditions
Min.
2.5
—
Typ.
Max.
12.0
12.0
Input supply voltage 1
Input supply voltage 2
VDD1
VDD1 pin
VDD2 pin
—
V
V
VDD2
VSW
—
VSW1 pin, VC = VDD1
VC = VSS
—
—
6.0
5.5
—
—
Step-up set voltage
Output voltage
V
VDD2 = 6V
VO
4.8
—
5.0
150
15
5.2
250
30
V
Ta = –30°C to +85°C
IVDD1-1
Operating time
current consumption 1
(during step-up
operation)
VDD1 = 3V, VDD2 = 6V
VDD1 = 3V, VDD2 = 6V
VDD1 = 6V, VDD2 = 6V
VDD1 = 6V, VDD2 = 6V
VDD1 = 12V, VDD2 = 12V
µA
µA
µA
µA
µA
mA
mA
(VDD1 system)
IVDD2-1
—
(VDD2 system)
IVDD1-2
Operating time
—
100
20
200
40
(VDD1 system)
current consumption 2
(operation for
IVDD2-2
—
step-down only)
(VDD2 system)
Power off time
IQ
—
—
1.0
—
current consumption
VDD1 = 3V, VDD2 = 6V
VOH = 50mV
IOHSWO
IOLSWO
–0.6
1.0
Output current
at SWO pin
VDD1 = 3V, VDD2 = 6V
VOL = 50mV
—
Input stability
Load stability
∆VO
∆VO
VDD = 3V to 12V
—
—
50
50
—
—
mV*
mV*
IL = 10mA to 100mA
Input voltage level
at POFFX pin,
at VC pin
VIH
VIL
—
—
0.8VDD1
—
—
—
—
V
V
0.2VDD1
4–48
EPSON
S1F70000 Series
Technical Manual
S1F71200 Series
DC Characteristics
Unless otherwise specified, Ta = 25°C.
Rating
Unit
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Input pin leak current
at POFFX pin,
at VC pin
ILINH
VIN = VDD1
—
—
1.0
µA
µA
ILINL
TSS
VIN = VSS
—
—
—
–1.0
—
SSCAP = 0.1µF
VDD1 = 3.0V, VC = VDD1
IO = 50mA
Step-up soft start time
100
ms*
Step-up portion
EFFI
fOSC
IDET
VDD1 = 3.3V, VC = VSS
—
120
0.10
—
85
200
—
280
0.20
—
%*
kHz
V
conversion efficiency
VDD1 = 3V
Oscillation frequency
(Measure it at the SWO pin.)
Overcurrent detection
voltage
VISENSE
0.15
0.015
Output voltage
∆VO
Ta = –30°C to +85°C
%/°C
∆Topr
temperature coefficient
* These values are available when external parts are used in the example of circuit connection shown on the at-
tached sheet.
The characteristics vary with applicable parts. Select proper parts after sufficient evaluation.
S1F70000 Series
Technical Manual
EPSON
4–49
S1F71200 Series
S1F71200M0B0 (Output : 3.3V)
DC Characteristics
Unless otherwise specified, Ta = 25°C.
Rating
Unit
Parameter
Symbol
Conditions
Min.
2.5
—
Typ.
Max.
12.0
12.0
Input supply voltage 1
Input supply voltage 2
VDD1
VDD2
VDD1 pin
VDD2 pin
—
V
V
—
VSW1 pin, VC = VDD1
VC = VSS
—
—
4.3
3.8
—
—
Step-up set voltage
Output voltage
VSW
VO
V
VDD2 = 4.3V
3.15
—
3.3
150
15
3.45
250
30
V
Ta = –30°C to +85°C
IVDD1-1
VDD1 = 3V, VDD2 = 4.3V
VDD1 = 3V, VDD2 = 4.3V
VDD1 = 5V, VDD2 = 5V
VDD1 = 5V, VDD2 = 5V
VDD1 = 12V, VDD2 = 12V
Operating time
current consumption 1
(during step-up
operation)
µA
µA
µA
µA
µA
mA
mA
(VDD1 system)
IVDD2-1
—
(VDD2 system)
IVDD1-2
Operating time
—
100
20
200
40
(VDD1 system)
current consumption 2
(operation for
IVDD2-2
—
step-down only)
(VDD2 system)
Power off time
IQ
—
—
1.0
—
current consumption
VDD1 = 3V, VDD2 = 4.3V
VOH = 50mV
IOHSWO
IOLSWO
–0.6
1.0
Output current
at SWO pin
VDD1 = 3V, VDD2 = 4.3V
VOL = 50mV
—
Input stability
Load stability
∆VO
∆VO
VDD = 3V to 12V
—
—
50
50
—
—
mV*
mV*
IL = 10mA to 100mA
Input voltage level
at POFFX pin,
at VC pin
VIH
VIL
—
—
0.8VDD1
—
—
—
—
V
V
0.2VDD1
4–50
EPSON
S1F70000 Series
Technical Manual
S1F71200 Series
DC Characteristics
Unless otherwise specified, Ta = 25°C.
Rating
Unit
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Input pin leak current
at POFFX pin,
at VC pin
ILINH
VIN = VDD1
—
—
1.0
µA
µA
ILINL
TSS
VIN = VSS
—
—
—
–1.0
—
SSCAP = 0.1µF
VDD1 = 3.0V, VC = VDD1
IO = 50mA
Step-up soft start time
70
ms*
Step-up portion
EFFI
fOSC
IDET
VDD1 = 3V, VC = VSS
—
120
0.10
—
85
—
280
0.20
—
%*
kHz
V
conversion efficiency
VDD = 3V
Oscillation frequency
200
(Measure it at the SWO pin.)
Overcurrent detection
voltage
VISENSE
0.15
0.015
Output voltage
∆VO
Ta = –30°C to +85°C
%/°C
∆Topr
temperature coefficient
* These values are available when external parts are used in the example of circuit connection shown on the at-
tached sheet.
The characteristics vary with applicable parts. Select proper par ts after sufficient evaluation.
S1F70000 Series
Technical Manual
EPSON
4–51
S1F71200 Series
EXAMPLE OF EXTERNAL CONNECTION OF REFERENCE CIRCUIT
Basic Circuit
Driver
Oscillator
SWO
VDD1
Overcurrent
detection
circuit
_
+
ISENSE
PWM
VDD2
SSC
Soft start
_
+
EXO
VSS
Series
regulator
VO
VSW
SWC
+
_
SRC
Error amplifier
VC
IREF
Reference
voltage
circuit
POFFX
VREF
4–52
EPSON
S1F70000 Series
Technical Manual
S1F71200 Series
Example of Parts Connection
D
CVSW
S1F71200
N
ch
L
MOSTr
SWO
Input voltage
V
V
DD1
DD2
I
SENSE
CVDD1
RSENSE
AC/DC
VBAT
SSC
CSSC
PNPTr
EXO
VSS
V
SW
Output voltage
VO
CVOUT
SWC
VC
SRC
IREF
RIREF
POFFX
VREF
CVREF
Parts examples
CVDD1
NchTr
L
47µF
(Sanyo 16SA47M)
(Hitachi HAT2037T)
(Sumida CR54)
47µH
D
Schottky
47µF
(Rohm RB161L-40)
(Sanyo 16SA47M)
(2SA1242)
CVSW
PNPTr
CVOUT
RIREF
CVREF
CSSC
RSENSE
22µF
100kΩ
0.1µF
0.1µF
0.1Ω
(Sanyo 10SL22M)
* Characteristics vary with applicable conditions and parts. Select proper parts after sufficient evaluation.
S1F70000 Series
Technical Manual
EPSON
4–53
S1F71200 Series
MECHANICAL DATA
Plastic SSOP2-16pin
Reference
D
D1
16
9
INDEX
θ
1
8
θ
θ
2
R
R
C
1
e
b
L2
L
3
L1
Lead type STD (SSOP2-16pin STD)
Dimension in Milimeters
Dimension in Inches*
Symbol
Min.
4.2
6.4
Nom.
4.4
6.6
Max.
4.6
6.8
Min.
(0.166)
(0.252)
Nom.
(0.173)
(0.260)
Max.
E
D1
(0.181)
(0.267)
(0.066)
A
1.7
A1
A2
e
b
C
θ
0.05
1.5
0.8
0.36
0.15
(0.002)
(0.059)
(0.031)
(0.014)
(0.006)
1.4
1.6
(0.056)
(0.062)
0.26
0.1
0°
0.46
0.25
10°
(0.011)
(0.004)
(0°)
(0.018)
(0.009)
(10°)
L
0.3
0.5
0.9
0.4
6.2
0.7
(0.012)
(0.020)
(0.035)
(0.016)
(0.244)
(0.027)
L1
L2
HE
5.9
6.5
7
(0.233)
(0.255)
(0.275)
D
θ2
θ3
R
R1
* for reference
4–54
EPSON
S1F70000 Series
Technical Manual
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