Rev.1.0
_00
STEP-UP, 600 kHz, PWM CONTROL or PWM / PFM SWITCHABLE
BUILT-IN TRANSISTOR SWITCHING REGULATOR (MULTICHIP PACKAGE)
S-83M355/83M356 Series
Features
• Built-in power MOS FET
: 75 mΩ (typ.)
: 20 V withstanding voltage
• Input voltage : 1.5 V to 6.5 V
• Output voltage : 2.0 V to 15 V
: can be changed by an external resistor
• Oscillation frequency : 600 kHz
• Efficiency : 85% (typ.)
• Soft start function
• Shutdown function
The S-83M355/83M356 Series is a CMOS step-up
switching regulator with power MOS FET (multichip
package) which mainly consists of a reference voltage
source, an oscillation circuit, an error amplifier, a phase
compensation circuit, a PWM control circuit (S-83M355
Series) and a PWM / PFM switching control circuit (S-
83M356 Series). With a built-in low on-state resistance
power MOS FET, this product can adapt to applications
requiring high efficiency and a high output current with
few external parts.
The S-83M355 Series employs a PWM control circuit
whose duty ratio can be varied linearly, is ideal for
applications requiring a low ripple voltage.
The S-83M356 Series features a PWM / PFM switching
control circuit that can prevent a decline in the efficiency
during a light load.
S-83M335/83M356 Series is ideal for applications
requiring high efficiency and a high output current due to
its built-in 20 V withstanding voltage power MOS FET.
Applications
• Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs
• Power supplies for audio equipment such as portable CD / MD players
Package
Package Name
PLP-8B
Drawing Code
Package
XB008-A
Tape
XA008-A
Reel
XA008-A
Land
XB008-A
Example of Typical Circuit
Example of Typical Characteristics
S-83M356Q50 (V
OUT
=
5.0 V, f
OSC
=
600 kHz)
PWM / PFM at automatic switching operation
L
SD
C
C
R
A
OUT
CONT
VDD
VOUT
R
B
100
80
+
-
C
L
Oscillation
Circuit
V
IN
+
-
C
IN
PMW control circuit
or PWM / PFM
switching control
circuit
Soft start built-in
reference power
supply
η
[%]
IC internal
power
supply
R
1
+
-
R
2
Phase
compensation
circuit
V
IN
= 4.0V
V
IN
= 3.0V
V
IN
= 2.0V
60
40
Gate
Protection
Diode
VSS
20
0.1
1
10
I
OUT
[mA]
100
1000
PVSS
ON/OFF
Ground point
Figure 1
Figure 2
Seiko Instruments Inc.
1
STEP-UP, 600 kHz, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR (MULTICHIP PACKAGE)
Rev.1.0
_00
S-83M355/83M356 Series
Product Name Structure
The control system, product types, and output voltage for the S-83M355/83M356 Series can be selected at the user’s
request. Please refer to the “2.
Product Name”
for the definition of the product name.
1. Function List
Table 1
The corresponding voltage
Output voltage value by an output voltage
[V]
setting resistor
*1
[V]
2.0
5.0
2.0
5.0
2.0
≤
V
OUT(S)
≤
15.0
5.0
≤
V
OUT(S)
≤
15.0
2.0
≤
V
OUT(S)
≤
15.0
5.0
≤
V
OUT(S)
≤
15.0
Control system
PWM control
Yes
Yes
No
No
PWM / PFM
switching control
No
No
Yes
Yes
Product Name
S-83M355Q20
S-83M355Q50
S-83M356Q20
S-83M356Q50
*1.
The output voltage value can optionally be set by an external divider resistor in the S-83M355/83M356
Series. Refer to “
External Parts Selection” (4. Output voltage setting resistors (R
A
, R
B
)),
“
Application circuit”
for the setting.
Caution If the output voltage is set 6.5 V or higher by an external divider resistor, be careful of the
connection of VDD and ON/OFF pins. Determine the connection with attention for withstanding
voltage not to be applied the value exceeding absolute maximum ratings on VDD and ON/OFF
pins. Refer to Figure 1 for the setting.
2. Product Name
S-83M3 xx
Q
xx
-
X8T1
Package name and IC packing specifications
X8T1 : PLP-8B, Tape
*1
Output voltage
20 or 50
(e.g. When the output voltage is 2.0 V, it is expressed as 20.)
Product type
Q : With shutdown function
+
V
DD
/ V
OUT
separate type, f
OSC
=
600 kHz
Control system
55 : PWM control
56 : PWM / PFM switching control
*1.
Refer to the taping specifications.
2
Seiko Instruments Inc.
STEP-UP, 600 kHz, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR (MULTICHIP PACKAGE)
Rev.1.0
_00
S-83M355/83M356 Series
Pin Configurations
PLP-8B
Top view
8 7 6 5
Table 2
Pin No.
1, 2
3
4
Symbol
PVSS
VSS
ON/OFF
VOUT
VDD
CONT
Pin Description
Power GND pin
GND pin
Shutdown pin
“H” : Normal operation (Step-up operation)
“L” : Stop step-up (Whole circuit stop)
Output voltage pin
IC power supply pin
External inductor connection pin
1 2 3 4
Bottom view
1 2 3 4
5
6
7, 8
＜1＞ ＜2＞
8
7 6 5
Figure 3
Caution The heatsinks of backside at shadowed area <1> and <2> cannot be used short-circuited since they
have a different electric potential.
Connect the heatsink of backside at shadowed area <1> to the board, set electric potential open or
CONT.
Connect the heatsink of backside at shadowed area <2> to the board, set electric potential open or
VDD.
Although the heatsink of backside at shadowed area <2> is connected internally to VDD, do not use it
as the function of electrode.
Refer to Land Recommendation (No. XB008-A-L-SD) for board pattern.
Seiko Instruments Inc.
3
STEP-UP, 600 kHz, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR (MULTICHIP PACKAGE)
Rev.1.0
_00
S-83M355/83M356 Series
Absolute Maximum Ratings
Table 3
Item
VOUT pin voltage
ON / OFF pin voltage
VDD pin voltage
CONT pin voltage
CONT pin current
Symbol
V
OUT
V
ON / OFF
V
DD
V
CONT
I
CONT
I
CONTP
P
D
Topr
Tstg
(Ta = 25
°C
unless otherwise specified)
Absolute maximum rating
Unit
V
SS
−
0.3 to V
SS
+
12
V
V
SS
−
0.3 to V
SS
+
12
V
SS
−
0.3 to V
SS
+
8
V
SS
−
0.3 to V
SS
+
20
1
4
*1
400
*2
−
40 to
+
85
−
40 to
+
125
DC
Pulse
A
mW
°
C
Power dissipation
Operating ambient temperature
Storage temperature
*1.
Condition : PW
=
10
µ
s, Duty cycle
≤
1%
*2.
Measurement conditions
(1) Measurement environment : Mounted on board (with no wind)
(2) Board material
: FR4
(3) Board size
: 30 mm
×
70 mm
×
1.6 mm (wired on both sides 120%)
Caution 1. The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
2. Since this IC has a built-in power MOS FET, make sure that dissipation of the power MOS FET does
not exceed the allowable power dissipation of the package (Refer to Figure 4).
Generally, dissipation of a switching regulator can be calculated by the following equation.
Dissipation
=
(100 (%)
−
efficiency (%) )
×
output voltage
×
load current
The greater part of dissipation depends on the built-in power MOS FET, however, dissipation of the
external diode or inductor is also included.
In addition, since power dissipation of the package also changes according to a mounting board or a
mounting state, fully check them using an actually mounted model.
800
Power dissipation (P
D
)
[mW]
600
400
200
0
0
25
50
85
75 100 125 150 175
Ambient temperature (Ta) [
°
C]
Figure 4 Power Dissipation of The Package (Mounted on board)
4
Seiko Instruments Inc.
STEP-UP, 600 kHz, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR (MULTICHIP PACKAGE)
Rev.1.0
_00
S-83M355/83M356 Series
Electrical Characteristics
Table 4
Item
Output voltage
Input voltage
Operation start voltage
Oscillation start voltage
Operation holding voltage
Current consumption 1
Current consumption 2
Current consumption during
shutdown
Switching transistor
on-state resistance
Switching transistor
leakage current
Symbol
V
OUT
V
IN
V
ST1
V
ST2
V
HLD
I
SS1
I
SS2
I
SSS
R
DS(ON)
I
SWQ
Condition
(Ta = 25
°
C unless otherwise specified)
Measurement
Min.
Typ.
Max.
Unit
circuit
V
OUT(S)
V
OUT(S)
V
OUT(S)
V
4
×
0.976
×
1.024
−
−
6.5
−
−
1.5
−
−
1.4
1
0.7
−
−
I
OUT
=
1 mA
No external parts, Voltage applied to V
DD
I
OUT
=
1 mA, Judged by decreasing V
IN
voltage gradually
V
OUT
=
V
OUT(S)
×
0.95
V
OUT
=
V
OUT(S)
+
0.5 V
V
ON / OFF
=
0 V
V
GS
=
3.3 V, I
CONT
=
300 mA (Pulse test)
−
1.25
16.2
−
2.0
32.4
0.5
150
m
Ω
mA
µ
A
4
1
−
−
−
−
−
−
−
−
−
75
3
V
CONT
=
20 V,
V
ON / OFF
=
0 V
V
OUT(S)
=
5 V : V
IN
=
V
OUT(S)
×
0.4 to
×
0.6,
I
OUT
=
1 mA
V
OUT(S)
=
2 V : V
IN
=
V
OUT(S)
−
0.5 to
−
0.3,
I
OUT
=
1 mA
I
OUT
=
10
µ
A to V
OUT(S)
/ 50
×
1.25
−
10
µ
A
2
Line regulation
Load regulation
Output voltage temperature
coefficient
Oscillation frequency
Maximum duty ratio
PWM / PFM switching duty
ratio (For S-83M356 Series)
ON / OFF
pin input voltage
ON / OFF
pin input current
Soft start time
Efficiency
External parts
∆
V
OUT1
∆
V
OUT2
∆
V
OUT
∆
Ta
•
V
OUT
f
OSC
MaxDuty
PFMDuty
30
30
±
50
60
60
−
mV
4
Ta
= −
40 to
+
85
°
C
V
DD
=
3.3 V
V
DD
=
3.3 V
V
IN
=
V
OUT(S)
−
0.1 V, No-load
Measured oscillation at CONT pin
Measured oscillation stop at CONT pin
510
65
10
0.75
−
−
0.1
−
0.1
−
−
600
78
15
−
−
−
−
690
85
24
−
ppm
/
°
C
kHz
%
%
V
µ
A
1
4
1
V
SH
V
SL
I
SH
I
SL
t
SS
EFFI
V
ON / OFF
=
V
OUT(S)
×
0.95
V
ON / OFF
=
0 V
0.3
0.1
0.1
6.0
−
1.5
−
3.0
85
ms
%
4
Coil:
Diode:
Capacitor:
CDRH8D28-100 of Sumida Corporation
M1FH3 (Schottky type) of Shindengen electric MFG. Co., LTD.
F93 (20 V, 47
µ
F tantalum type) of Nichicon Corporation
V
OUT(S)
=
5 V : V
IN
=
V
OUT(S)
×
0.6 applied, I
OUT
=
V
OUT(S)
/ 50
Ω
, V
DD
=
ON/OFF
=
V
OUT
V
OUT(S)
=
2 V : V
IN
=
V
OUT(S)
−
0.5 applied, I
OUT
=
V
OUT(S)
/ 50
Ω
, V
DD
=
ON/OFF
=
V
OUT
Remark 1.
V
OUT(S)
specified above is the set output voltage value, and V
OUT
is the typical value of the actual output voltage.
2.
A step-up operation is performed from V
DD
=
1.5 V. However, 1.8 V
≤
V
DD
≤
6.5 V is recommended stabilizing
the output voltage and oscillation frequency.
Seiko Instruments Inc.
5
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