Rev.1.2
_00
ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM
SWITCHING CONTROL STEP-UP 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
controller (S-8353 Series) and a PWM/PFM switching
controller (S-8354 Series).
Simply attaching a coil, capacitor, and diode externally
can configure the step-up switching regulator. In
addition to the above features, the small package and
low power consumption of this series make it ideal for
portable device applications requiring high efficiency.
The S-8353 Series realizes low ripple, high efficiency,
and excellent transient characteristics due to its PWM
controller, which can vary the duty ratio linearly from
0 % to 83 % (from 0 % to 78 % for 250 kHz models),
optimally-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:
•
Low current consumption:
•
Duty ratio:
•
External parts:
•
Output voltage:
•
Oscillation frequency:
•
Soft start function:
Start-up is guaranteed from 0.9 V (I
OUT
=1
mA)
During operation: 18.7
µA
(3.3 V, 50 kHz, typ.)
During shutdown: 0.5
µA
(max.)
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)
Coil, capacitor, and diode
Can be set in 0.1 V steps between 1.5 and 6.5 V (for V
DD
/V
OUT
separate
types) or 2.0 and 6.5 V (for other than V
DD
/V
OUT
separate types). Accuracy
of
±2.4%.
30 kHz, 50 kHz, and 250 kHz
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, video equipment, and communications equipment
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
ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
Rev.1.2
_00
S-8353/8354 Series
Block Diagrams
1. A, C, H type (Without Shutdown Function)
CONT
VOUT
Oscillation circuit IC internal
power supply
PWM control,
+
PWM/PFM switching
−
control circuit
Soft start built-in Phase
reference power compensation
supply
circuit
VSS
Figure 1
2. A, H type (With Shutdown Function)
CONT
VOUT
Oscillation circuit IC internal
power supply
PWM control,
+
PWM/PFM switching
−
control circuit
Soft start built-in Phase
reference power compensation
supply
circuit
ON / OFF
Figure 2
3. D, J type
CONT
VDD
Oscillation circuit IC internal
power supply
PWM control,
+
PWM/PFM switching
−
control circuit
Soft start built-in Phase
reference power compensation
supply
circuit
Figure 3
VSS
VOUT
VSS
2
Seiko Instruments Inc.
ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
Rev.1.2
_00
S-8353/8354 Series
Product Name Structure
1. Function List
Table 1
Product name Control system
S-8353AxxMC
S-8353AxxMA
S-8353AxxUA
S-8353CxxMA
S-8353DxxMC
S-8353HxxMC
S-8353HxxMA
S-8353HxxUA
S-8353JxxMC
S-8354AxxMC
S-8354AxxMA
S-8354AxxUA
S-8354CxxMA
S-8354DxxMC
S-8354HxxMC
S-8354HxxMA
S-8354HxxUA
S-8354JxxMC
PWM
PWM
PWM
PWM
PWM
PWM
PWM
PWM
PWM
PWM/PFM
switching
PWM/PFM
switching
PWM/PFM
switching
PWM/PFM
switching
PWM/PFM
switching
PWM/PFM
switching
PWM/PFM
switching
PWM/PFM
switching
PWM/PFM
switching
Switching
Shutdown
V
DD
/V
OUT
frequency [kHz] function separate type
50
50
50
30
50
250
250
250
250
50
50
50
30
50
250
250
250
250
Yes
Yes
Yes
Yes
Yes
Yes
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
SOT-23-5
SOT-23-3
SOT-89-3
Application
Application requiring shutdown
function
Application not requiring shutdown
function
Application not requiring shutdown
function
For pager
Application in which output voltage
is adjusted by external resistance
Application requiring shutdown
function and thin coil
Application not requiring shutdown
function and requiring thin coil
Application not requiring shutdown
function and requiring thin coil
Application in which output voltage
is adjusted by external resistance
and that requires thin coil
Application requiring shutdown
function
Application not requiring shutdown
function
Application not requiring shutdown
function
SOT-23-3 For pager
SOT-23-5
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-5
Application in which output voltage
is adjusted by external resistance
Application requiring shutdown
function and thin coil
Application not requiring shutdown
function and requiring thin coil
Application not requiring shutdown
function and requiring thin coil
Application in which output voltage
is adjusted by external resistance
and that requires thin coil
Seiko Instruments Inc.
3
ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
Rev.1.2
_00
S-8353/8354 Series
2. Product Name
S-835 x x xx xx - xxx - T2
IC direction in tape specifications
Product code
*2
*1
Package code
MA: SOT-23-3
MC: SOT-23-5
UA: SOT-89-3
Output voltage
15 to 65
(Ex. When the output voltage is 1.5 V, it is expressed as 15.)
Product type
A: Normal products (SOT23-3, SOT-89-3),
or With shutdown function products (SOT-23-5),
C: Normal products
D: V
DD
/V
OUT
separate type,
H: Normal products (SOT23-3, 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 control
*1.
Refer to the taping specifications at the end of this book.
*2.
Refer to the “3.
Product Name List”.
f
osc
=50 kHz
f
osc
=50 kHz
f
osc
=30 kHz
f
osc
=50 kHz
f
osc
=250 kHz
f
osc
=250 kHz
f
osc
=250 kHz
4
Seiko Instruments Inc.
ULTRA-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
Rev.1.2
_00
S-8353/8354 Series
3. Product Name List
3-1.
S-8353 Series
Table 2
Output voltage S-8353AxxMC Series
S-8353AxxMA Series
S-8353AxxUA Series
S-8353CxxMA 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
3.8 V
S-8353A38MC-IQX-T2
5.0 V
S-8353A50MC-IRJ-T2
S-8353A50MA-IRJ-T2
S-8353A50UA-IRJ-T2
Remark
Please contact the SII marketing department for products with an output voltage other than those
specified above.
Table 3
Output voltage S-8353DxxMC Series
S-8353HxxMC 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-8353H31MC-IWQ-T2
3.1 V
3.3 V
S-8353H33MC-IWS-T2
3.8 V
S-8353H38MC-IWX-T2
4.0 V
S-8353H40MC-IWZ-T2
S-8353H45MC-IXE-T2
4.5 V
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.
3-2. S-8354 Series
Table 4
Output voltage S-8354AxxMC Series
S-8354AxxMA Series
S-8354AxxUA Series S-8354DxxMC Series
S-8354D20MC-JUF-T2
2.0 V
2.7 V
S-8354A27MC-JQM-T2 S-8354A27MA-JQM-T2
3.0 V
S-8354A30MC-JQP-T2 S-8354A30MA-JQP-T2 S-8354A30UA-JQP-T2
3.3 V
S-8354A33MC-JQS-T2 S-8354A33MA-JQS-T2 S-8354A33UA-JQS-T2
4.0 V
S-8354A40MC-JQZ-T2
5.0 V
S-8354A50MC-JRJ-T2
S-8354A50MA-JRJ-T2 S-8354A50UA-JRJ-T2
Remark
Please contact the SII marketing department for products with an output voltage other than those
specified above.
Table 5
Output voltage S-8354HxxMC Series
S-8354JxxMC Series
3.0 V
S-8354H30MC-JWP-T2
3.3 V
S-8354H33MC-JWS-T2
5.0 V
S-8354H50MC-JXJ-T2
S-8354J50MC-JZJ-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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