Rev.1.4
_00
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE
BUILT-IN TRANSISTOR SWITCHING REGULATOR
S-8353/8354 Series
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 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 : 30 kHz, 50 kHz, and 250 kHz selectable
• Soft start function : 6 ms (50 kHz, typ.)
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
Package Name
SOT-23-3
SOT-23-5
SOT-89-3
Package
MP003-A
MP005-A
UP003-A
Drawing Code
Tape
MP003-A
MP005-A
UP003-A
Reel
MP003-A
MP005-A
UP003-A
Seiko Instruments Inc.
1
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.1.4
_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.1.4
_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 and “4.
Product Name
List”
for the full product names.
1. Function List
(1) PWM Control Products
Table 1
Product Name
S-8353AxxMC
S-8353AxxMA
S-8353AxxUA
S-8353CxxMA
S-8353DxxMC
S-8353HxxMC
S-8353HxxMA
S-8353HxxUA
S-8353JxxMC
Switching
Frequency
kHz
50
50
50
30
50
250
250
250
250
Shutdown
Function
Yes
−
−
−
−
Yes
−
−
−
V
DD
/ V
OUT
Separate
Type
−
−
−
−
Yes
−
−
−
Yes
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
(2) PWM / PFM Switching Control Products
Table 2
Product Name
S-8354AxxMC
S-8354AxxMA
S-8354AxxUA
S-8354CxxMA
S-8354DxxMC
S-8354HxxMC
S-8354HxxMA
S-8354HxxUA
S-8354JxxMC
Switching
Frequency
kHz
50
50
50
30
50
250
250
250
250
Shutdown
Function
Yes
−
−
−
−
Yes
−
−
−
V
DD
/ V
OUT
Separate
Type
−
−
−
−
Yes
−
−
−
Yes
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.1.4
_00
S-8353/8354 Series
2. Package and Function List by Product Type
Table 3
Series Name
S-8353 Series,
S-8354 Series
Package Name Shutdown Function V
DD
/ V
OUT
Separate Type
(Abbreviation)
Yes / No
Yes / No
A (Normal product or with shutdown function)
MC
Yes
No
A = 50 kHz
MA / UA
No
C (Normal product)
MA
No
No
C = 30 kHz
D (V
DD
/ V
OUT
separate type)
MC
No
Yes
D = 50 kHz
H (Normal product or with shutdown
MC
Yes
No
function)
MA / UA
No
H = 250 kHz
J (V
DD
/ V
OUT
separate type)
MC
No
Yes
J = 250 kHz
Type
3. Product Name
S-835 x
x
xx
xx - xxx - T2
IC direction in tape specifications
*1
Product code
*2
Package code
MA : SOT-23-3
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
f
OSC
= 50 kHz
f
OSC
= 30 kHz
f
OSC
= 50 kHz
f
OSC
= 250 kHz
f
OSC
= 250 kHz
*1.
Refer to the taping specifications.
*2.
Refer to the
Table 4
to
Table 7
in the “4.
Product Name List”.
4
Seiko Instruments Inc.
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.1.4
_00
S-8353/8354 Series
4. Product Name List
(1) S-8353 Series
Table 4
Output
S-8353AxxMC
S-8353AxxMA
S-8353AxxUA
S-8353CxxMA
voltage
Series
Series
Series
Series
2.0 V
S-8353A20MC-IQF-T2
−
−
−
2.5 V
S-8353A25MC-IQK-T2
−
−
−
2.7 V
S-8353A27MC-IQM-T2
−
−
−
2.8 V
S-8353A28MC-IQN-T2
−
−
−
3.0 V
S-8353A30MC-IQP-T2
S-8353A30MA-IQP-T2
−
S-8353C30MA-ISP-T2
3.3 V
S-8353A33MC-IQS-T2
S-8353A33MA-IQS-T2
S-8353A33UA-IQS-T2
−
3.6 V
−
−
S-8353A36UA-IQV-T2
−
3.8 V
S-8353A38MC-IQX-T2
−
−
−
4.0 V
−
−
S-8353A40UA-IQZ-T2
−
4.5 V
S-8353A45MC-IRE-T2
−
−
−
5.0 V
S-8353A50MC-IRJ-T2
S-8353A50MA-IRJ-T2
S-8353A50UA-IRJ-T2
−
5.5 V
S-8353A55MC-IRO-T2
−
S-8353A55UA-IRO-T2
−
Remark
Please contact the SII marketing department for products with an output voltage other than those specified above.
Table 5
Output
voltage
S-8353DxxMC
Series
S-8353HxxMC
Series
S-8353HxxUA
Series
S-8353JxxMC
Series
2.0 V
S-8353D20MC-IUF-T2
−
−
S-8353J20MC-IYF-T2
2.5 V
−
−
−
S-8353J25MC-IYK-T2
3.0 V
S-8353D30MC-IUP-T2
S-8353H30MC-IWP-T2
−
S-8353J30MC-IYP-T2
3.1 V
−
S-8353H31MC-IWQ-T2
−
−
3.2 V
−
S-8353H32MC-IWR-T2
−
−
3.3 V
−
S-8353H33MC-IWS-T2
S-8353H33UA-IWS-T2
−
3.5 V
−
S-8353H35MC-IWV-T2
−
−
3.8 V
−
S-8353H38MC-IWX-T2
−
−
4.0 V
−
S-8353H40MC-IWZ-T2
−
−
4.5 V
−
S-8353H45MC-IXE-T2
−
−
5.0 V
S-8353D50MC-IVJ-T2
S-8353H50MC-IXJ-T2
−
S-8353J50MC-IZJ-T2
Remark
Please contact the SII marketing department for products with an output voltage other than those specified above.
Seiko Instruments Inc.
5
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