Rev.4.1
_00
SUPER-SMALL PACKAGE PWM CONTROL,
PWM/PFM SWITCHING CONTROL
STEP-UP SWITCHING REGULATOR
S-8355/56/57/58 Series
The S-8355/56/57/58 Series is a CMOS step-up switching regulator
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) and a PWM/PFM switching control circuit
(S-8356/58). 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 a PWM control circuit whose
duty ratio can be varied 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 circuit.
S-8356/58 Series operation can be switched under a light load to a
PFM control circuit with a duty ratio of 15% via a PWM/PFM switching
control circuit to prevent a decline in the efficiency due to the IC
operating current.
Features
•
Low voltage operation: Startup is guaranteed from 0.9 V (I
OUT
=
1 mA)
•
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)
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: Can be set 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) in 0.1 V steps. Accuracy of
±2.4%.
•
Oscillation frequency: 100 kHz, 250 kHz, 300 kHz, 600 kHz
•
Soft start function: 6 ms (100 kHz, typ.)
•
Shutdown function
Packages
•
SOT-89-3
•
SOT-23-3
•
SOT-23-5
•
6-Pin SNB(B)
(Package code: UP003-A)
(Package code: MP003-A)
(Package code: MP005-A)
(Package code: BD006-A)
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 microprocessors
Seiko Instruments Inc.
1
SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
Rev.4.1
_00
S-8355/56/57/58 Series
Block Diagram
(1) S-8357/58 Series B, H, F Type
(
Without shutdown function
)
VOUT
Oscillation
Circuit
PWM or PWM
/PFM switching
control circuit
Soft start
built-in reference
power supply
IC internal
power supply
Oscillation
Circuit
PWM or PWM
/PFM switching
control circuit
IC internal
power supply
(2) S-8357/58 Series B, H, F, N Type (
With shutdown function
)
VOUT
+
+
EXT
-
EXT
VSS
-
VSS
Phase
compensation
circuit
Soft start
built-in reference
power supply
Phase
compensation
circuit
ON/OFF
Figure 1
(3) S-8357/58 Series E, J, G, P Type
(
V
DD
/V
OUT
separate type
)
VDD
Oscillation
Circuit
PWM or PWM
/PFM switching
control circuit
Soft start
built-in reference
power supply
Figure 2
(4) S-8355/56 Series K, L, M, Q Type
VOUT
IC internal
power
supply
VDD
Oscillation
Circuit
PWM or PWM
/PFM switching
control circuit
Soft start
built-in reference
power supply
VOUT
IC internal
power
supply
+
EXT
-
VSS
+
EXT
-
VSS
Phase
compensation
circuit
Phase
compensation
circuit
ON/OFF
Figure 3
Figure 4
2
Seiko Instruments Inc.
SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
Rev.4.1
_00
S-8355/56/57/58 Series
Selection Guide
•
The control types, 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 “Product name selection guide” for the definition of
the product name and “Product Name List” for the full product names.
1. Function List
1-1. PWM control products
Table 1
Product Name
S-8355KxxMC
S-8355LxxMC/BD
S-8355MxxMC/BD
S-8355QxxMC/BD
S-8357BxxMC
S-8357BxxMA
S-8357BxxUA
S-8357ExxMC
S-8357FxxMC/BD
S-8357GxxMC/BD
S-8357HxxMC/BD
S-8357JxxMC/BD
S-8357NxxMC/BD
S-8357PxxMC/BD
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
1-2. PWM/PFM switching control products
Table 2
Product name
S-8356KxxMC
S-8356LxxMC/BD
S-8356MxxMC/BD
S-8356QxxMC/BD
S-8358BxxMC
S-8358BxxMA
S-8358BxxUA
S-8358ExxMC
S-8358FxxMC/BD
S-8358GxxMC/BD
S-8358HxxMC/BD
S-8358JxxMC/BD
S-8358NxxMC/BD
S-8358PxxMC/BD
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
SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
Rev.4.1
_00
S-8355/56/57/58 Series
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
Package Name
(Abbreviation)
MC/BD
Shutdown
Function
Yes/No
Yes
V
DD
/V
OUT
Separate Type
Yes/No
Yes
MA/UA
MC/BD
No
No
Yes
S-8357 Series
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
MC/BD
Yes
No
MC/BD
No
Yes
MA/UA
MC/BD
No
No
Yes
S-8358 Series
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
MC/BD
Yes
No
MC/BD
No
Yes
4
Seiko Instruments Inc.
SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
Rev.4.1
_00
S-8355/56/57/58 Series
3. Product Name
S-835 x x xx xx - xxx - Tx
IC direction in tape specifications
TF: 6-Pin SNB(B)
Product name (abbreviation)
*2
*1
T2: SOT-89-3, SOT-23-3, SOT-23-5
Package name (abbreviation)
UA: SOT-89-3
MA: SOT-23-3
MC: SOT-23-5
BD: 6-Pin-SNB(B)
Output voltage 15 to 65 (Ex. When the output voltage is 1.5 V, it is expressed as 15.)
Product type
B:
H:
F:
N:
E:
J:
G:
P:
K:
L:
M:
Q:
Normal product,
f
OSC
=
100 kHz (S-8357/58)
Normal product,
f
OSC
=
250 kHz (S-8357/58)
Normal product,
f
OSC
=
300 kHz (S-8357/58)
Normal product,
f
OSC
=
600 kHz (S-8357/58)
V
DD
/V
OUT
separate type,
f
OSC
=
100 kHz (S-8357/58)
V
DD
/V
OUT
separate type,
f
OSC
=
250 kHz (S-8357/58)
V
DD
/V
OUT
separate type,
f
OSC
=
300 kHz (S-8357/58)
V
DD
/V
OUT
separate type,
f
OSC
=
600 kHz (S-8357/58)
Shutdown function
+
V
DD
/V
OUT
separate type, f
OSC
=
100 kHz (S-8355/56)
Shutdown function
+
V
DD
/V
OUT
separate type, f
OSC
=
250 kHz (S-8355/56)
Shutdown function
+
V
DD
/V
OUT
separate type, f
OSC
=
300 kHz (S-8355/56)
Shutdown function
+
V
DD
/V
OUT
separate type, f
OSC
=
600 kHz (S-8355/56)
Control system
5 or 7: PWM control
6 or 8: PWM/PFM switching control
*1.
Please refer to the taping specifications at the end of this document.
*2.
Please refer to the product name list.
Seiko Instruments Inc.
5
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