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PDF S-8352 Data sheet ( Hoja de datos )

Número de pieza S-8352
Descripción (S-8351 / S-8352) SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR
Fabricantes Seiko Instruments 
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No Preview Available ! S-8352 Hoja de datos, Descripción, Manual

Rev.2.0_00
STEP-UP, SUPER-SMALL PACKAGE, PFM CONTROL
SWITCHING REGULATOR / SWITCHING REGULATOR
CONTROLLER
S-8351/8352 Series
The S-8351/8352 Series is a CMOS step-up switching regulator controller
which mainly consists of a reference voltage source, an oscillation circuit,
a comparator and PFM control circuit. The PFM control circuit allows the
duty ratio to be automatically switched according to the load (at light load :
50%, at high output current : 75%), enabling products with a low ripple
over a wide range, high efficiency, and high output current (A, B, and D
type). Products with a fixed duty ratio of 75% are also available (C type).
The S-8351 Series can configure a step-up switching regulator with an
external coil, capacitor, and diode. A protection circuit turns off the built-in
MOS FET when the voltage at the CONT pin exceeds the limit to prevent it
from being damaged. In addition to the above features, the small package
and low current consumption, makes the S-8351 Series ideal for
applications such as the power supply unit of portable equipment.
The S-8352 Series, which features an external transistor, is suitable for
applications requiring a high output current.
„ Features
• Low voltage operation : Startup at 0.9 V min. (IOUT = 1 mA) guaranteed
• Low current consumption : During operation 23.2 µA (VOUT = 3.3 V, typ.)
During shutdown 0.5 µA (max.)
• Duty ratio : 50 % / 75 % built-in auto-switching-type PFM control circuit (A, B, and D type)
75 % built-in fixed-type PFM control circuit (C type)
• External parts : Coil, capacitor, and diode
• Output voltage : Selectable in 0.1 V steps between 2.0 to 6.5 V (A, B, and C type)
Selectable in 0.1 V steps between 1.5 to 6.5 V (D type)
• Output voltage accuracy : ±2.4%
• Shutdown function (A type)
www.DataSVheDeDt4/ UV.OcUoTmseparate type (D type)
• External transistor type available (S-8352 Series)
• Lead-free products
„ 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.
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S-8352 pdf
STEP-UP, SUPER-SMALL PACKAGE, PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.2.0_00
S-8351/8352 Series
2. Package and Function List by Product Type
Table 3
Series Name
S-8351 Series,
S-8352 Series
Type
A (Duty ratio 50% / 75% auto-switching type)
A = 100 kHz
B (Duty ratio 50% / 75% auto-switching type)
B = 100 kHz
C (Duty ratio 75% fixed type)
C = 100 kHz
D (Duty ratio 50% / 75% auto-switching type)
D = 100 kHz
Package Name
(Abbreviation)
MC
MA
MA / UA
MC
Shutdown Function VDD / VOUT Separate Type
Yes / No
Yes / No
Yes No
No No
No No
No Yes
3. Product Name
S-835 x x xx xx - xxx T2 G
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 55
(e.g. When the output voltage is 1.5 V, it is expressed as 15.)
www.DataSheet4U.com
Product type
A : With shutdown function,
fOSC = 100 kHz
B : 50% / 75% automatic duty ratio switching type, fOSC = 100 kHz
C : 75% duty ratio fixed type,
fOSC = 100 kHz
D : VDD / VOUT separate type,
fOSC = 100 kHz
Series name
1 : Built-in power MOS FET
2 : External power MOS FET
*1. Refer to the taping specifications.
*2. Refer to the Table 4 to Table 5 in the “4. Product Name List”.
Seiko Instruments Inc.
5

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S-8352 arduino
STEP-UP, SUPER-SMALL PACKAGE, PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.2.0_00
S-8351/8352 Series
Item Symbol
Table 15 (2 / 2)
Condition
(Ta = 25°C unless otherwise specified)
Min. Typ. Max.
Unit
Measurement
circuit
ON / OFF pin input voltage
(With shutdown function)
VSH
VSL1
VSL2
VOUT = VOUT(S) × 0.95,
Measured oscillation at CONT pin
VOUT = VOUT(S) × 0.95,
Judged oscillation stop at
CONT pin
At VOUT1.5 V
At VOUT<1.5 V
0.75
ON / OFF pin input current ISH
VON/ OFF = 10 V
0.1
(With shutdown function)
Efficiency
ISL
EFFI
VON/ OFF = 0 V
S-8351x30
S-8351x50
0.1
External parts
Coil:
Diode:
CDRH6D28-101 (100 µH) of Sumida Corporation
MA2Z748 (Shottky type) of Matsushita Electric Industrial Co., Ltd.
Capacitor: F93 (16 V, 47 µF tantalum type) of Nichicon Corporation
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 250
With shutdown function :
ON / OFF pin is connected to VOUT
For VDD / VOUT separate type : VDD pin is connected to VOUT pin
86
88
0.3
0.2
0.1
0.1
V
V
V
µA
µA
%
%
2
2
2
2
2
1
1
Remark 1.
2.
VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output
voltage.
VDD / VOUT separate type
A step-up operation is performed from VDD = 0.8 V. However, 1.8 VVDD10 V is recommended stabilizing the
output voltage and oscillation frequency. (VDD1.8 V must be applied for products with a set value of less than
1.9 V.)
www.DataSheet4U.com
Seiko Instruments Inc.
11

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