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S-8357 PDF даташит

Спецификация S-8357 изготовлена ​​​​«Seiko Instruments» и имеет функцию, называемую «PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER».

Детали детали

Номер произв S-8357
Описание PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Производители Seiko Instruments
логотип Seiko Instruments логотип 

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S-8357 Даташит, Описание, Даташиты
S-8355/56/57/58 Series
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or
www.sii-ic.com
PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
© SII Semiconductor Corporation, 2002-2015
Rev.8.1_01
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. (IOUT = 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 VDD / VOUT separate types)
Selectable in 0.1 V steps between 2.0 and 6.5 V (for other than VDD / VOUT 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
1









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S-8357 Даташит, Описание, Даташиты
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series
Rev.8.1_01
Block Diagrams
(1) S-8357/58 Series B, H and F Types
(Without Shutdown Function)
(2) S-8357/58 Series B, H, F and N Types
(With Shutdown Function)
VOUT
VOUT
EXT
Oscillation circuit IC internal
power supply
PWMcontrol circuit or
PWM / PFM switching
control circuit
+
Soft start built-in
reference power
supply
Phase
compensation
circuit
EXT
VSS
Oscillation circuit
PWMcontrol circuit or
PWM / PFM switching
control circuit
IC internal
power
supply
+
Soft start built-in
reference power
supply
Phase
compensation
circuit
VSS
Figure 1
ON / OFF
Figure 2
(3) S-8357/58 Series E, J, G and P Types
(VDD / VOUT Separate Type)
VDD
VOUT
Oscillation circuit
IC internal
power
supply
EXT
PWMcontrol circuit or
PWM / PFM switching
control circuit
+
Soft start built-in
reference power
supply
Phase
compensation
circuit
(4) S-8355/56 Series K, L, M and Q Types
(With Shutdown Function, VDD / VOUT Separate Type)
VDD
VOUT
Oscillation circuit
IC internal
power
supply
EXT
PWMcontrol circuit or
PWM / PFM switching
control circuit
+
VSS
Soft start built-in
reference power
supply
Phase
compensation
circuit
VSS
Figure 3
ON / OFF
Figure 4
2









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S-8357 Даташит, Описание, Даташиты
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.8.1_01
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
Product Name
S-8355KxxMC
Switching
Frequency
kHz
100
Shutdown
Function
Yes
Table 1
VDD / VOUT
Separate
Type
Package
Yes SOT-23-5
S-8355LxxMC
250
Yes Yes SOT-23-5
S-8355MxxMC
300
Yes Yes SOT-23-5
S-8355QxxMC
S-8357BxxMC
S-8357BxxMA
S-8357BxxUA
S-8357ExxMC
600
100
100
100
100
Yes Yes SOT-23-5
Yes SOT-23-5
− − SOT-23-3
− − SOT-89-3
Yes SOT-23-5
S-8357FxxMC
300
Yes SOT-23-5
S-8357GxxMC
300
Yes SOT-23-5
S-8357HxxMC
250
Yes SOT-23-5
S-8357JxxMC
250
Yes SOT-23-5
S-8357NxxMC
600
Yes SOT-23-5
S-8357PxxMC
600
Yes SOT-23-5
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
3










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