S-8355/56/57/58 Series
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© Seiko Instruments Inc., 2002-2010
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or
PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0
_00
The S-8355/56/57/58 Series is a CMOS step-up switching regulator controller which mainly consists of a reference voltage
source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM control circuit (S-8355/57 Series) and
a PWM/PFM switching control circuit (S-8356/58 Series).
With an external low-ON-resistance Nch Power MOS, this product is ideal for applications requiring high efficiency and a
high output current.
The S-8355/57 Series realizes low ripple, high efficiency, and excellent transient characteristics due to its PWM control
circuit whose duty ratio can be varied linearly from 0 to 83% (from 0 to 78% for 250 kHz, 300 kHz, and 600 kHz models), an
excellently designed error amplifier and a phase compensation circuits.
S-8356/58 Series features a PWM/PFM switching controller that can switch the operation to a PFM controller with a duty
ratio is 15% under a light load to prevent a decline in the efficiency due to the IC operating current.
Features
• Low voltage operation : Startup at 0.9 V min. (I
OUT
= 1 mA) guaranteed
• Low current consumption : During operation 25.9
μA
(3.3 V, 100 kHz, typ.)
During shutdown 0.5
μA
(max.)
• Duty ratio : Built-in PWM/PFM switching control circuit (S-8356/58 Series)
15 to 83% (100 kHz models)
15 to 78% (250 kHz, 300 kHz, and 600 kHz models)
• External parts : Coil, diode, capacitor, and transistor
• Output voltage : Selectable in 0.1 V steps between 1.5 and 6.5 V (for V
DD
/ V
OUT
separate types)
Selectable in 0.1 V steps between 2.0 and 6.5 V (for other than V
DD
/ V
OUT
separate types)
• Output voltage accuracy :
±2.4%
• Oscillation frequency : 100 kHz, 250 kHz, 300 kHz, 600 kHz selectable
• Soft start function : 6 ms (100 kHz, typ.)
• Shutdown function
• Lead-free, Sn 100%, halogen-free
*1
*1.
Refer to “
Product Name Structure”
for details.
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
• Constant voltage power supplies for cameras, VCRs, and communications devices
• Power supplies for microcomputers
Packages
• SOT-23-3
• SOT-23-5
• SOT-89-3
• 6-Pin SNB(B)
Seiko Instruments Inc.
1
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0
_00
S-8355/56/57/58 Series
Block Diagrams
(1) S-8357/58 Series B, H and F Types
(Without Shutdown Function)
VOUT
Oscillation circuit
EXT
PWMcontrol circuit or
PWM / PFM switching
control circuit
Soft start built-in
reference power
supply
Phase
compensation
circuit
IC internal
power supply
+
−
EXT
Oscillation circuit
PWMcontrol circuit or
PWM / PFM switching
control circuit
Soft start built-in
reference power
supply
IC internal
power
supply
+
−
(2) S-8357/58 Series B, H, F and N Types
(With Shutdown Function)
VOUT
VSS
Phase
compensation
circuit
VSS
ON / OFF
Figure 1
(3) S-8357/58 Series E, J, G and P Types
(V
DD
/ V
OUT
Separate Type)
VDD
Oscillation circuit
EXT
PWMcontrol circuit or
PWM / PFM switching
control circuit
Soft start built-in
reference power
supply
Phase
compensation
circuit
VOUT
IC internal
power
supply
+
−
Figure 2
(4) S-8355/56 Series K, L, M and Q Types
(With Shutdown Function, V
DD
/ V
OUT
Separate Type)
VDD
Oscillation circuit
PWMcontrol circuit or
PWM / PFM switching
control circuit
Soft start built-in
reference power
supply
Phase
compensation
circuit
VOUT
IC internal
power
supply
+
−
EXT
VSS
VSS
ON / OFF
Figure 3
Figure 4
2
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0
_00
S-8355/56/57/58 Series
Product Name Structure
The control system, product types, output voltage, and packages for the S-8355/56/57/58 Series can be selected at the
user’s request. Please refer to the “3.
Product Name”
for the definition of the product name, “4.
Package”
regarding the
package drawings and “5.
Product Name List”
for the full product names.
1. Function List
(1) PWM Control Products
Table 1
Product Name
S-8355KxxMC
S-8355LxxMC,
S-8355LxxBD
S-8355MxxMC,
S-8355MxxBD
S-8355QxxMC,
S-8355QxxBD
S-8357BxxMC
S-8357BxxMA
S-8357BxxUA
S-8357ExxMC
S-8357FxxMC,
S-8357FxxBD
S-8357GxxMC,
S-8357GxxBD
S-8357HxxMC,
S-8357HxxBD
S-8357JxxMC,
S-8357JxxBD
S-8357NxxMC,
S-8357NxxBD
S-8357PxxMC,
S-8357PxxBD
Switching
Frequency
kHz
100
250
300
600
100
100
100
100
300
300
250
250
600
600
Shutdown
Function
Yes
Yes
Yes
Yes
Yes
−
−
−
Yes
−
Yes
−
Yes
−
V
DD
/ V
OUT
Separate
Type
Yes
Yes
Yes
Yes
−
−
−
Yes
−
Yes
−
Yes
−
Yes
Package
SOT-23-5
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-5
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
Application
Applications requiring variable output voltage
and a shutdown function
Applications requiring variable output voltage,
a shutdown function, and a thin coil
Applications requiring variable output voltage,
a shutdown function, and a thin coil
Applications requiring variable output voltage,
a shutdown function, and a thin coil
Applications requiring a shutdown function
Applications not requiring a shutdown function
Applications not requiring a shutdown function
Applications in which output voltage is
adjusted by external resistor
Applications requiring a shutdown function
and a thin coil
Applications requiring variable output voltage
and a thin coil
Applications requiring a shutdown function
and a thin coil
Applications requiring variable output voltage
with an external resistor and a thin coil
Applications requiring a shutdown function
and a thin coil
Applications requiring variable output voltage
with an external resistor and a thin coil
Seiko Instruments Inc.
3
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0
_00
S-8355/56/57/58 Series
(2) PWM / PFM Switching Control Products
Table 2
Product Name
S-8356KxxMC
S-8356LxxMC,
S-8356LxxBD
S-8356MxxMC,
S-8356MxxBD
S-8356QxxMC,
S-8356QxxBD
S-8358BxxMC
S-8358BxxMA
S-8358BxxUA
S-8358ExxMC
S-8358FxxMC,
S-8358FxxBD
S-8358GxxMC,
S-8358GxxBD
S-8358HxxMC,
S-8358HxxBD
S-8358JxxMC,
S-8358JxxBD
S-8358NxxMC,
S-8358NxxBD
S-8358PxxMC,
S-8358PxxBD
Switching
Frequency
kHz
100
250
300
600
100
100
100
100
300
300
250
250
600
600
Shutdown
Function
Yes
Yes
Yes
Yes
Yes
−
−
−
Yes
−
Yes
−
Yes
−
V
DD
/ V
OUT
Separate
Type
Yes
Yes
Yes
Yes
−
−
−
Yes
−
Yes
−
Yes
−
Yes
Package
SOT-23-5
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-5
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
SOT-23-5,
6-Pin SNB(B)
Application
Applications requiring variable output voltage
and a shutdown function
Applications requiring variable output voltage,
a shutdown function, and a thin coil
Applications requiring variable output voltage,
a shutdown function, and a thin coil
Applications requiring variable output voltage,
a shutdown function, and a thin coil
Applications requiring a shutdown function
Applications not requiring a shutdown function
Applications not requiring a shutdown function
Applications in which output voltage is
adjusted by external resistor
Applications requiring a shutdown function
and a thin coil
Applications requiring variable output voltage
and a thin coil
Applications requiring a shutdown function
and a thin coil
Applications requiring variable output voltage
with an external resistor and a thin coil
Applications requiring a shutdown function
and a thin coil
Applications requiring variable output voltage
with an external resistor and a thin coil
2. Package and Function List by Product Type
Table 3
Series Name
S-8355 Series,
S-8356 Series
Type
K, L, M, Q (Shutdown function
+
V
DD
/ V
OUT
separate type)
K = 100 kHz, L = 250 kHz, M = 300 kHz,
Q = 600 kHz
B, H, F (Normal product)
B = 100 kHz, H = 250 kHz, F = 300 kHz
N (Normal product)
N = 600 kHz
E, J, G, P (V
DD
/ V
OUT
separate type)
E = 100 kHz, J = 250 kHz, G = 300 kHz,
P = 600 kHz
B, H, F (Normal product)
B = 100 kHz, H = 250 kHz, F = 300 kHz
N (Normal product)
N = 600 kHz
E, J, G, P (V
DD
/ V
OUT
separate type)
E = 100 kHz, J = 250 kHz, G = 300 kHz,
P = 600 kHz
Package Name
(Abbreviation)
Shutdown Function
Yes / No
V
DD
/ V
OUT
Separate
Type
Yes / No
Yes
MC / BD
MA / UA
MC / BD
MC / BD
MC / BD
MA / UA
MC / BD
MC/BD
MC / BD
Yes
No
Yes
Yes
No
No
Yes
Yes
No
S-8357 Series
No
No
Yes
No
No
Yes
S-8358 Series
4
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.7.0
_00
S-8355/56/57/58 Series
3. Product Name
(1) SOT-23-3 Packages
S-835 x
x
xx
MA - xxx
T2
G
Environmental code
G : Lead-free (for details, please contact our sales office)
IC direction in tape specifications
*1
T2 : SOT-23-3
Product name (abbreviation)
*2
Package name (abbreviation)
MA : SOT-23-3
Output voltage
15 to 65
(e.g. When the output voltage is 1.5 V, it is expressed as 15.)
Product type
B : Normal product,
(S-8357/58 Series)
H : Normal product,
(S-8357/58 Series)
F : Normal product,
(S-8357/58 Series)
N : Normal product,
(S-8357/58 Series)
E : V
DD
/ V
OUT
separate type,
(S-8357/58 Series)
J : V
DD
/ V
OUT
separate type,
(S-8357/58 Series)
G : V
DD
/ V
OUT
separate type,
(S-8357/58 Series)
P : V
DD
/ V
OUT
separate type,
(S-8357/58 Series)
K : With shutdown function
+
V
DD
/ V
OUT
separate type,
(S-8355/56 Series)
L : With shutdown function
+
V
DD
/ V
OUT
separate type,
(S-8355/56 Series)
M :With shutdown function
+
V
DD
/ V
OUT
separate type,
(S-8355/56 Series)
Q : With shutdown function
+
V
DD
/ V
OUT
separate type,
(S-8355/56 Series)
Control system
5 or 7 : PWM control
6 or 8 : PWM / PFM switching control
f
OSC
= 100 kHz
f
OSC
= 250 kHz
f
OSC
= 300 kHz
f
OSC
= 600 kHz
f
OSC
= 100 kHz
f
OSC
= 250 kHz
f
OSC
= 300 kHz
f
OSC
= 600 kHz
f
OSC
= 100 kHz
f
OSC
= 250 kHz
f
OSC
= 300 kHz
f
OSC
= 600 kHz
*1.
Refer to the tape specifications.
*2.
Refer to the
Table 4
to
Table 13
in the “5.
Product Name List”.
Seiko Instruments Inc.
5
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