S-8353/8354 Series
www.sii-ic.com
© Seiko Instruments Inc., 2002-2010
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE
BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.3.0
_00
The S-8353/8354 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an
oscillation circuit, a power MOS FET, an error amplifier, a phase compensation circuit, a PWM control circuit (S-8353 Series)
and a PWM / PFM switching control circuit (S-8354 Series).
The S-8353/8354 Series can configure the step-up switching regulator with an external coil, capacitor, and diode. In
addition to the above features, the small package and low current consumption make the S-8353/8354 Series ideal for
portable equipment applications requiring high efficiency.
The S-8353 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 models), an excellently designed error
amplifier, and phase compensation circuits.
The S-8354 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 18.7
μ
A (3.3 V, 50 kHz, typ.)
During shutdown: 0.5
μ
A (max.)
• Duty ratio : Built-in PWM / PFM switching control circuit (S-8354 Series)
15 % to 83 % (30 kHz and 50 kHz models)
15 % to 78 % (250 kHz models)
• External parts : Coil, capacitor, and diode
• Output voltage : Selectable in 0.1 V steps between 1.5 V and 6.5 V (for V
DD
/ V
OUT
separate types)
Selectable in 0.1 V steps between 2.0 V and 6.5 V (for other than V
DD
/ V
OUT
separate types)
• Output voltage accuracy :
±2.4%
• Oscillation frequency : 30 kHz, 50 kHz, and 250 kHz selectable
• Soft start function : 6 ms (50 kHz, typ.)
• 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 communication devices
• Power supplies for microcomputers
Packages
• SOT-23-3
• SOT-23-5
• SOT-89-3
Seiko Instruments Inc.
1
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.3.0
_00
S-8353/8354 Series
Block Diagrams
(1) A, C and H Types (Without Shutdown Function)
CONT
Oscillation circuit
PWMcontrol circuit
or PWM / PFM
swiching control
circuit
Soft start built-in
reference power
supply
IC internal
power supply
+
−
VOUT
Phase
compensation
circuit
VSS
Figure 1
(2) A and H Types (With Shutdown Function)
CONT
Oscillation circuit
PWMcontrol circuit
or PWM / PFM
swiching control
circuit
Soft start built-in
reference power
supply
VOUT
IC internal
power supply
+
−
Phase
compensation
circuit
VSS
ON / OFF
Figure 2
(3) D and J Types (V
DD
/ V
OUT
Separate Type)
CONT
Oscillation circuit
VDD
IC internal
power supply
+
PWMcontrol circuit
−
or PWM / PFM
swiching control
circuit
Soft start built-in
reference power
supply
Phase
compensation
circuit
VSS
VOUT
Figure 3
2
Seiko Instruments Inc.
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.3.0
_00
S-8353/8354 Series
Product Name Structure
The control system, product types, output voltage, and packages for the S-8353/8354 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
Switching
Frequency
[kHz]
50
50
50
30
30
50
250
250
250
250
Shutdown
Function
Yes
−
−
−
−
−
Yes
−
−
−
V
DD
/ V
OUT
Separate
Type
−
−
−
−
−
Yes
−
−
−
Yes
Product Name
S-8353AxxMC
S-8353AxxMA
S-8353AxxUA
S-8353CxxMA
S-8353CxxUA
S-8353DxxMC
S-8353HxxMC
S-8353HxxMA
S-8353HxxUA
S-8353JxxMC
Package
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-3
SOT-89-3
SOT-23-5
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-5
Application
Applications requiring shutdown function
Applications not requiring shutdown function
Applications not requiring shutdown function
For pager
For pager
Applications requiring variable output voltage
with an external resistor
Applications requiring a shutdown function
and a thin coil
Applications not requiring a shutdown function
and requiring a thin coil
Applications not requiring a shutdown function
and requiring a thin coil
Applications requiring variable output voltage
with an external resistor and a thin coil
(2) PWM / PFM Switching Control Products
Table 2
Switching
Frequency
[kHz]
50
50
50
30
50
250
250
250
250
Shutdown
Function
Yes
−
−
−
−
Yes
−
−
−
V
DD
/ V
OUT
Separate
Type
−
−
−
−
Yes
−
−
−
Yes
Product Name
S-8354AxxMC
S-8354AxxMA
S-8354AxxUA
S-8354CxxMA
S-8354DxxMC
S-8354HxxMC
S-8354HxxMA
S-8354HxxUA
S-8354JxxMC
Package
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-3
SOT-23-5
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-5
Application
Applications requiring shutdown function
Applications not requiring shutdown function
Applications not requiring shutdown function
For pager
Applications requiring variable output voltage
with an external resistor
Applications requiring a shutdown function
and a thin coil
Applications not requiring a shutdown function
and requiring a thin coil
Applications not requiring a shutdown function
and requiring a thin coil
Applications requiring variable output voltage
with an external resistor and a thin coil
Seiko Instruments Inc.
3
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.3.0
_00
S-8353/8354 Series
2. Package and Function List by Product Type
Table 3
Series Name
Type
A (Normal product or with shutdown function)
A = 50 kHz
C (Normal product)
C = 30 kHz
D (V
DD
/ V
OUT
separate type)
D = 50 kHz
H (Normal product or with shutdown
function)
H = 250 kHz
J (V
DD
/ V
OUT
separate type)
J = 250 kHz
Package Name Shutdown Function V
DD
/ V
OUT
Separate Type
(Abbreviation)
Yes / No
Yes / No
MC
MA / UA
MA
MC
MC
MA / UA
MC
Yes
No
No
No
Yes
No
No
No
Yes
No
No
Yes
S-8353 Series,
S-8354 Series
3. Product Name
(1) SOT-23-3
S-835 x
x
xx
MA - xxx
xx
x
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
IC direction in tape specifications
T1 : Product of environmental code = U
T2 : Product of environmental code = G
Product code
*2
Package code
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
A : Normal products (SOT-23-3, SOT-89-3)
or With shutdown function products (SOT-23-5),
C : Normal products,
D : V
DD
/ V
OUT
separate type,
H : Normal products (SOT-23-3, SOT-89-3)
or With shutdown function products (SOT-23-5),
J : V
DD
/ V
OUT
separate type,
Control system
3 : PWM control
4 : PWM / PFM switching control
*1
f
OSC
= 50 kHz
f
OSC
= 30 kHz
f
OSC
= 50 kHz
f
OSC
= 250 kHz
f
OSC
= 250 kHz
*1.
Refer to the tape specifications.
*2.
Refer to the
Table 4
to
Table 8
in the “5.
Product Name List”.
4
Seiko Instruments Inc.
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.3.0
_00
S-8353/8354 Series
(2) SOT-23-5, SOT-89-3
S-835 x
x
xx
xx - xxx
T2
x
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
IC direction in tape specifications
Product code
*2
Package code
MC : SOT-23-5
UA : SOT-89-3
Output voltage
15 to 65
(e.g. When the output voltage is 1.5 V, it is expressed as 15.)
Product type
A : Normal products (SOT-23-3, SOT-89-3)
or With shutdown function products (SOT-23-5),
C : Normal products,
D : V
DD
/ V
OUT
separate type,
H : Normal products (SOT-23-3, SOT-89-3)
or With shutdown function products (SOT-23-5),
J : V
DD
/ V
OUT
separate type,
Control system
3 : PWM control
4 : PWM / PFM switching control
*1
f
OSC
= 50 kHz
f
OSC
= 30 kHz
f
OSC
= 50 kHz
f
OSC
= 250 kHz
f
OSC
= 250 kHz
*1.
Refer to the tape specifications.
*2.
Refer to the
Table 4
to
Table 8
in the “5.
Product Name List”.
4. Package
Package Name
SOT-23-3
SOT-23-5
SOT-89-3
Environmental code = G
Environmental code = U
Drawing Code
Tape
MP003-A-C-SD
MP003-C-C-SD
MP005-A-C-SD
UP003-A-C-SD
Package
MP003-A-P-SD
MP003-C-P-SD
MP005-A-P-SD
UP003-A-P-SD
Reel
MP003-A-R-SD
MP003-Z-R-SD
MP005-A-R-SD
UP003-A-R-SD
Seiko Instruments Inc.
5
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