S1F76620M0A0 [SEIKO]
SWITCHED CAPACITOR CONVERTER, 30kHz SWITCHING FREQ-MAX, PDSO8, SOP4-8;
| 型号： | S1F76620M0A0 |
| 厂家： | 
SEIKO EPSON CORPORATION |
| 描述： | SWITCHED CAPACITOR CONVERTER, 30kHz SWITCHING FREQ-MAX, PDSO8, SOP4-8 开关 光电二极管 |
| 文件： | 总17页 (文件大小：149K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MF302 12
POWERSUPPLY IC
S1F76620 Technical Manual
S1F76620 Series
S1F76620 Series CMOS DC/DC Converter (Voltage Doubler)
DESCRIPTION
FEATURES
S1F76620 is a high efficiency and low power consump-
tion CMOS DC/DC converter. It enables to obtain 2
times step-up output (3.0 to 16V) from input voltage
(1.5 to 8V). Also, S1F76620 enable to drive ICs (liquid
crystal driver, analog IC, etc.), which require another
power supply in addition to logic main power supply,
with a single power supply, and it is suitable for micro
power IC of hand-held computers, handy devices, etc.
due to its small power consumption.
(1) High efficiency and low power consumption
CMOS DC/DC converter
(2) Easy voltage conversion from input voltage VDD (5V)
to positive potential side or negative potential side
• Input VDD (5V) to output –VDD (–5V),
2VDD (10V)
(3) Output current
: Max. 30mA
(VDD = 5V)
(4) Power conversion efficiency : Typ. 95%
(5) Possibility of series connection
(In 2-piece use, VDD = 5V, VO = 15V)
(6) Low voltage operation
: Suitable for
battery drive
(7) Built-in CR oscillator
(8) SOP4-8pin······························ S1F76620M0A0
Bare Chip ······························· S1F76620D0A0
BLOCK DIAGRAM
Voltage conversion circuit
VDD
VO
OSC1
OSC2
CR oscillator
POFF
GND
CAP1+ CAP1–
1–10
EPSON
S1F70000 Series
Technical Manual
S1F76620 Series
PIN DESCRIPTIONS
Pin Assignments
P
OFF
1
2
3
4
8
7
6
5
VO
GND
OSC1
OSC2
CAP1+
CAP1–
V
DD
Pin Assignments of SOP4-8pin
Pin descriptions
Pin No. Pin name
Description
1
2
POFF
Input pin for power off control.
GND (VSS) Power pin. (Minus side, System GND)
Oscillation resistor connection pin. Works as the clock input pin when the
external clock operates.
3
OSC1
4
5
6
7
8
OSC2
VDD
Oscillation resistor connection pin. Opens when the external clock operates.
Power pin. (Plus side, System VCC)
CAP1–
CAP1+
VO
Pump up capacitor minus side connection pin for 2 times step-up.
Pump up capacitor plus side connection pin for 2 times step-up.
Output pin at the time of 2 times step-up.
S1F70000 Series
Technical Manual
EPSON
1–11
S1F76620 Series
Pad Center Coordinates (S1F76620D0A0)
Pad center
coordinates
X (µm)
Pad center
Pad No.
Pad name
coordinates
Description
Y (µm)
1096
788
—
—
1
2
(NC)
(NC)
–984
3
4
5
6
7
8
9
10
580
390
96
–218
–510
–802
–1094
–1134
Input pin for power off control
POFF
(NC)
—
—
—
(NC)
(NC)
GND (VSS)
OSC1
OSC2
VDD
Power input pin (Minus side)
Oscillation resistor connection pin
Oscillation resistor connection pin
Power input pin (Plus side)
984
Pump up capacitor minus side connection pin for 2
times step-up
Pump up capacitor plus side connection pin for 2
times step-up
11
12
CAP1–
CAP1+
–892
–514
—
13
14
15
16
17
(NC)
VO
(NC)
(NC)
(NC)
182
372
750
942
1134
2 times step-up output pin
—
—
—
Chip External Shape
Y
2.60mm
+
X
(0,0)
2.30mm
Pad Assignment
Pad aperture : 100µm × 100µm Chip thickness : 400µm
Note
Do not bond the NC pad.
1–12
EPSON
S1F70000 Series
Technical Manual
S1F76620 Series
FUNCTIONAL DESCRIPTIONS
CR Oscillator
S1F76620 has a built-in CR oscillator as the internal os-
cillator, and an external oscillation resistor ROSC is con-
nected between the pins OSC1 and OSC2 before opera-
tion.
Voltage Conversion Circuit
The voltage conversion circuit uses clocks generated in
the CR oscillator to double the input supply voltage
VDD.
In case of 2 times step-up, 2 times voltage (2VDD) of
the input voltage is obtained from the VO pin when a
pump up capacitor is connected between CAP1+ and
CAP2– and a smoothing capacitor is connected be-
tween VDD and VO outside.
OSC1
OSC2
(Note 1)
ROSC
When GND is 0 and VDD is 5, the relations between
input/output and voltage are as shown below:
CAP1=2VDD=10V
Note 1
V
DD=5V
ND=0V
Since the oscillation frequency varies with wiring ca-
pacitance, make the cables between the terminals OSC1
and OSC2 and ROSC as short as possible.
G
When setting the external resistor ROSC, find ROSC suit-
able for fOSC that brings about the maximum efficiency
from characteristics graph (9) and (10). The relations
between ROSC and fOSC in characteristics graph (1) are
expressed approximately with the following formula as
far as the
straight portion (500kΩ < ROSC < 2MΩ) is concerned:
ROSC = A • (1/fOSC)
(A : Constant, When GND is 0V and VDD is 5V, A is
approximately 2.0 × 1010 (I/F).)
So, the ROSC value can be obtained from this formula.
(Recommended oscillation frequency : 10kHz to 30kHz
(ROSC : 2MΩ to 680kΩ))
When the external clock operates, make the pin OSC2
open as shown below and input the 50% duty of the ex-
ternal clock from the pin OSC1.
OSC1
External clock
OSC2
Open
S1F70000 Series
Technical Manual
EPSON
1–13
S1F76620 Series
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
(Ta = –40 to +85°C)
Rating
Parameter
Symbol
Unit
Remarks
Min.
–0.5
–0.5
—
Max.
Input supply voltage
Input pin voltage
VIN
VI
10.0
V
V
V
V
V
—
VDD + 0.5
20
OSC1, OSC2
Output voltage
VO
—
Output supply voltage
Output pin voltage
VCAP+
VCAP–
–0.5
–0.5
VDD + 0.5
VO + 0.5
300
CAP+
CAP–
DIP-8pin
SOP-8pin
Allowable loss
PD
—
mW
150
Operating temperature
Storage temperature
Topr
Tstg
–40
–65
85
°C
°C
—
—
150
Note 1
Under the conditions exceeding the above absolute maximum ratings, the IC may result in a permanent destruction.
An operation for a long period under the conditions of the above absolute maximum ratings may deteriorate the
reliability remarkably.
Note 2
All voltage values are based on GND being 0V.
1–14
EPSON
S1F70000 Series
Technical Manual
S1F76620 Series
Recommended Operating Conditions
(Ta = –40 to +85°C)
Rating
Parameter
Symbol
Unit
Remarks
Min.
Max.
ROSC = 1MΩ
VSTA1
1.5
—
V
C2 ≥ 10µF CL/C2 ≥ 1/20
See note 2.
Step-up start operation
Step-up stop voltage
VSTA2
VSTP
2.2
—
—
V
V
ROSC = 1MΩ
ROSC = 1MΩ
1.5
RLmin
See note 3.
Output load resistance RL
—
Ω
—
Output load current
Oscillation frequency
IO
—
30
30
mA
—
—
fOSC
10
kHz
External resistor for
oscillation
ROSC
680
3.3
2000
—
kΩ
µF
—
—
Step-up capacitor
C1, C2
Note 1
All voltages are based on the GND being 0V.
Note 2
The figure below shows the recommended circuit for operation with low voltages (VDD = 1.5 to 2.2V):
CL
RL
1
2
3
4
8
7
6
5
P
OFF
VO
GND
OSC1 CAP1–
OSC2
CAP1+
+
–
C1
*D1
+
–
C2
V
DD
* (DI (VF (IF=1mA) is recommended to be not more than 0.6V.)
Recommended Circuit
Note 3
RLmin varies with input voltage. See Characteristics Graph (15).
S1F70000 Series
Technical Manual
EPSON
1–15
S1F76620 Series
Electrical Characteristics
(VDD = 5V, Ta = –40 to +85°C)
Rating
Typ.
—
Symbol
Unit
Remarks
Parameter
Min.
1.8
—
Max.
8.0
Input supply voltage
Output voltage
VDD
VO
V
V
—
—
—
16.0
Step-up circuit current
consumption
IOPR
—
35
50
µA
ROSC = 1MΩ
Static current
IQ
—
16
—
—
20
85
1.0
24
µA
kHz
Ω
—
Oscillation frequency
Output impedance
fOSC
RO
ROSC = 1MΩ
IO = 10mA
130
Step-up power conver-
sion efficiency
Peff
ILKI
90
—
95
—
—
%
IO = 5mA
OSC1 pin
Input leak current
1.0
µA
Note 1
All voltage values are based on GND being 0V.
1–16
EPSON
S1F70000 Series
Technical Manual
S1F76620 Series
Characteristics Graph
1000
30
28
26
24
22
20
18
16
14
12
10
Ta=25°C
V
DD=5V
100
10
1
V
DD=5V
V
DD=3V
V
DD=2V
V
DD=3V
V
DD=2V
10
100
1000
OSC[kΩ]
10000
–40 –20
0
20 40 60 80 100
R
Ta[°C]
(1) Oscillation frequency vs.
(2) Oscillation frequency vs. Temperature
External resistance for oscillation
100
10
9
8
7
6
5
4
3
2
1
0
Ta=25°C
=C =10µF
80
60
40
20
0
C1
2
f
OSC=40kHz
f
OSC=20kHz
f
OSC=10kHz
Ta=25°C
DD=5V
V
C1=C2=10µF
0
1
2
3
4
5
6
0
5
10
15
20
25
30
V
DD[V]
I
O
[mA]
(3) Step-up circuit current consumption vs.
Input current
(4) Output voltage (VO) vs. Output current 1
S1F70000 Series
Technical Manual
EPSON
1–17
S1F76620 Series
6
5
4
3
4
3
2
1
0
2
Ta=25°C
Ta=25°C
DD=2V
=C =10µF
1
0
V
DD=3V
=C =10µF
V
C1
2
C1
2
0
1
2
3
4
5
6
7
8
9 10
0
5
10
15
20
I
O
[mA]
I
O
[mA]
(5) Output voltage (VO) vs. Output current 2
(6) Output voltage (VO) vs. Output current 3
300
300
250
200
150
100
50
Ta=25°C
=10mA
250
200
150
100
50
I
O
Ta=25°C
=5mA
I
O
0
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
VDD[V]
VDD[V]
(7) Output impedance vs. Input current 1
(8) Output impedance vs. Input voltage 2
1–18
EPSON
S1F70000 Series
Technical Manual
S1F76620 Series
100
90
80
70
60
50
40
30
20
10
0
150
120
90
60
30
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
Ta=25°C
VDD=5V
C1=C2=10µF
Ta=25°C
VDD=3V
C1=C2=10µF
0
10
20
30
0
5
10
15
20
IO [mA]
IO [mA]
(10) Step-up power conversion efficiency vs.
Output current 2
(9) Step-up power conversion efficiency vs.
Output current 1
Input current vs. Output current 2
Input current vs. Output current 1
100
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
I
O
=5mA
I
O =2mA
IO =10mA
I
O
=20mA
Ta=25°C
DD=5V
=C =10µF
Ta=25°C
DD=5V
C1=C2=10µF
V
V
C1
2
0
1
2
3
4
I
5 6 7 8 9 10
[mA]
1
10
100
1000
O
focs[kHz]
(11) Step-up power conversion efficiency vs.
Output current 3
(12) Step-up power conversion efficiency vs.
Oscillation frequency 1
Input current vs. Output current 3
S1F70000 Series
Technical Manual
EPSON
1–19
S1F76620 Series
100
90
100
90
80
70
60
50
IO =0.5mA
IO =1mA
80
IO =1mA
IO =5mA
IO =2mA
IO =10mA
70
IO =5mA
IO =2mA
Ta=25°C
DD=3V
=C =10µF
Ta=25°C
DD=2V
=C =10µF
60
50
V
V
C1
2
C1
2
1
10
100
focs[kHz]
1000
1
10
100
focs[kHz]
1000
(13) Step-up power conversion efficiency vs.
Oscillation frequency 2
(14) Step-up power conversion efficiency vs.
Oscillation frequency 3
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
Ta=25°C
C1=C2=10µF
ROSC=1MΩ
100
1000
10000
100000
RL[Ω]
(15) Step-up start voltage (1) vs. Load resistance
1–20
EPSON
S1F70000 Series
Technical Manual
S1F76620 Series
EXAMPLE OF REFERENCE EXTERNAL CONNECTION
2 Times Step-up
2 times step-up output of VO (2 × VDD) is obtained from the circuit shown in Figure 1.
•
1
2
3
4
8
7
6
5
2 V
I
P
OFF
VO
GND
OSC1 CAP1–
OSC2
CAP1+
+
–
+
–
V
I
V
DD
Figure 1 2 Time Step-up Operation
Parallel Connection
It is possible to make the output impedance (RO) small when several pieces of the circuit shown in Figure 1 are
connected. Parallel connection of n circuits reduces RO to 1/n approximately. One piece of the smoothing capacitor
C2 can be commonly used.
1
2
3
4
8
7
6
5
P
OFF
VO
GND
CAP1+
CAP1–
+
_
1
2
3
4
8
7
6
5
P
OFF
VO
OSC1
OSC2
GND
OSC1 CAP1–
OSC2
CAP1+
+
_
VDD
+
_
V
I
VDD
Figure 2 Parallel Connection
S1F70000 Series
Technical Manual
EPSON
1–21
S1F76620 Series
Series Connection
When S1F76620 is connected in series (VDD and VO in the previous stage are connected to GND and VDD in the next
stage respectively), the output voltage can be increased more. But the series connection makes the output impedance
high. Figure 3 shows an example of the series connection to get VO = 15V from VDD = 5V.
•
•
Vo=2 V
I
Vo'=3 V
I
1
2
3
4
8
7
6
5
P
OFF
VO
GND
CAP1+
CAP1–
+
–
1
2
3
4
8
7
6
5
P
OFF
VO
+
–
OSC1
OSC2
GND
CAP1+
+
V
DD
+
–
–
VI
OSC1 CAP1–
OSC2
VDD
Figure 3 Series Connection
First stage
Next stage
VO'=15V
VO
=10V
V
DD'
VDD(5V)
GND'
GND(0V)
Figure 4 Power Supply Relations in Series Connection (1)
Note
When the input voltage in the next stage is as per the specification (VDD-GND ≤ 8V) in a series connection, the
output in the first stage (VO-VDD) can be used as the input in the next stage (VDD-GND). (See Figure 5.)
Next stage
VO'=8V
First stage
VO=4V
VDD'
VDD(2V)
GND'
GND(0V)
Figure 5 Power Supply Relations in Series Connection (2)
1–22
EPSON
S1F70000 Series
Technical Manual
S1F76620 Series
Negative Voltage Conversion
S1F76620 can boost input voltage to twice on the positive potential side by using the circuit shown in Figure 6. But
the output voltage drops by the forward voltage VF of the diode. When GND is 0V, VDD is 5V and VF is 0.6V as
shown in Figure 6 for example, VO is calculated as follows: VO = –5V + 2 × 0.6V = –3.8V.
+
+
–
–
1
2
3
4
8
7
6
5
P
OFF
VO
GND
OSC1 CAP1–
OSC2
CAP1+
V
DD
VO'
Figure 6 Negative Voltage Conversion
Negative Voltage Conversion + Positive Voltage Conversion
When the 3 times step-up operation shown in Figure 1 and the positive voltage conversion in Figure 6 are combined,
the circuit shown in Figure 7 can be formed and 10V and –3.8V can be obtained from the input 5V. However, the
output impedance is higher than in case of connection of either one only (the negative voltage conversion or the
positive voltage conversion).
V
O1
Potential Relations Diagram
1
2
3
4
8
7
6
5
P
OFF
VO
2 V
I
V
DD
GND
OSC1 CAP1–
OSC2
CAP1+
+
–
+
V
I
–
•
V
SS
–VI+2 VF
V
DD
V
O2
V
O2
Figure 7 Negative Voltage Conversion + Positive Voltage Conversion
S1F70000 Series
Technical Manual
EPSON
1–23
S1F76620 Series
MEASUREMENT CIRCUIT
V
O
V
I
O
A
RL
1
2
3
4
8
7
6
5
P
OFF
VO
GND
OSC1 CAP1–
OSC2
CAP1+
V
+
–
+
I
OPR
C1
C2
–
A
ROSC
VDD
V
I
1–24
EPSON
S1F70000 Series
Technical Manual
S1F76620 Series
MECHANICAL DATA
S1F76620M0A0 SOP4-8pin
Reference
D
8
5
INDEX
θ
1
4
θ2
R1
R
C
L2
L
e
b
θ3
L1
Dimension in Milimeters
Dimension in Inches*
Nom.
Symbol
Min.
4.8
—
Nom.
5
—
1.75
0.15
1.6
1.27
0.35
0.15
Max.
5.2
—
Min.
(0.189)
—
Max.
(0.204)
—
E
D1
A
A1
A2
e
(0.197)
—
(0.069)
(0.006)
(0.063)
(0.050)
(0.014)
(0.006)
b
C
0.25
0.05
0.45
0.25
(0.010)
(0.002)
(0.017)
(0.009)
θ
L
0.55
(0.022)
L1
L2
HE
D
6.4
4.8
6.8
5
7.2
5.2
(0.252)
(0.189)
(0.268)
(0.197)
(0.283)
(0.204)
θ2
θ3
R
R1
* for reference
Note
This drawing is subject to change without notice for improvement.
S1F70000 Series
Technical Manual
EPSON
1–25
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