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PDF S-8533 Data sheet ( Hoja de datos )
| Número de pieza | S-8533 | |
| Descripción | SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER | |
| Fabricantes | Seiko Instruments | |
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STEP-DOWN, SYNCHRONOUS PWM CONTROL
SWITCHING REGULATOR CONTROLLER
S-8533 Series
The S-8533 Series is a synchronous PWM control CMOS step-down
switching regulator controller that includes a reference voltage source,
synchronous circuit, oscillation circuit, error amplifier, phase
compensation circuit, and PWM controller.
An efficient step-down switching regulator can be realized simply by
adding external P-channel and N-channel power MOS FETs, one coil,
and three capacitors.
Since the oscillation frequency is a high 300 kHz, the S-8533 can be
used to configure a high efficiency step-down switching regulator
capable of driving high output current using small external parts and a
3 to 10% increase in efficiency is obtained compared to conventional
step-down switching regulators.
The 8-Pin TSSOP package and high oscillation frequency make the S-
8533 ideal as the main power supply for portable devices.
Features
• Synchronous rectification system realizing high efficiency (typ. 94%)
• Use at maximum duty ratio = 100% and use of a battery up to maximum life is possible by using P-channel and N-
channel power MOS FETs externally.
• Oscillation frequency : 300 kHz typ.
• Input voltage :
2.7 to 16.0 V
• Output voltage :
1.25 V
1.3 to 6.0 V, selectable in 0.1 V steps
• Output voltage accuracy : ±2.0%
• Soft-start function set by an external capacitor (CSS)
• Shutdown function
• Small package :
8-Pin TSSOP
• Lead-free products
Applications
• Constant voltage power supply for hard disks and DVD drivers
• Power supplies for portable devices, such as digital cameras, PDAs, electronic organizers, and cellular phones
• Main or sub power supply for notebook PCs and peripherals
• Constant voltage power supply for cameras, video equipment, and communication equipment
Package
Package Name
8-Pin TSSOP
Package
FT008-A
Drawing Code
Tape
FT008-E
Reel
FT008-E
Seiko Instruments Inc.
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www.DaStaTShEePet4-DU.OcoWm N, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
Absolute Maximum Ratings
Table 2
Parameter
VIN pin voltage
VOUT pin voltage
ON/OFF pin voltage
CSS pin voltage
NDRV pin voltage
PDRV pin voltage
NDRV pin current
PDRV pin current
Power dissipation
Symbol
VIN
VOUT
VON/OFF
VCSS
VNDRV
VPDRV
INDRV
IPDRV
PD
Operating ambient temperature
Topr
Storage temperature
Tstg
*1. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name : JEDEC STANDARD51-7
(Ta = 25°C unless otherwise specified)
Absolute Maximum Rating
Unit
VSS − 0.3 to VSS + 18
VSS − 0.3 to VSS + 18
VSS − 0.3 to VSS + 18
VSS − 0.3 to VIN + 0.3
VSS − 0.3 to VIN + 0.3
VSS − 0.3 to VIN + 0.3
±100
V
V
V
V
V
V
mA
±100
mA
300 (When not mounted on board)
700*1
mW
mW
−40 to +85
°C
−40 to +125
°C
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
(1) When mounted on board
800
700
600
500
400
300
200
100
0
0
50 100 150
Ambient temperature Ta (°C)
(2) When not mounted on board
400
300
200
100
0
0 50 100 150
Ambient temperature Ta (°C)
Figure 3 Power Dissipation of Package
Seiko Instruments Inc.
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www.DaStaTShEePet4-DU.OcoWm N, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
External Parts Selection
1. Inductor
The inductance value (L) greatly affects the maximum output current (IOUT) and the efficiency (η).
As the L value is reduced gradually, the peak current (IPK) increases, the stability of the circuit is improved, and IOUT
increases. As the L value is made even smaller, the efficiency is lowered, and IOUT decreases since the current
driveability of the switching transistor is insufficient.
As the L value is increased, the dissipation in the switching transistor due to IPK decreases, and the efficiency
reaches the maximum at a certain L value. As the L value is made even larger, the efficiency degrades since the
dissipation due to the series resistance of the coil increases. IOUT also decreases.
An inductance of 22 μH is recommended for the S-8533 Series.
When choosing an inductor, attention to its allowable current should be paid since the current exceeding the
allowable value will cause magnetic saturation in the inductor, leading to a marked decline in efficiency and the
breakdown of the IC due to large current.
An inductor should therefore be selected so that IPK does not surpass its allowable current. IPK is expressed by the
following equation :
IPK = IOUT + VOUT × (VIN − VOUT)
2 × fOSC × L × VIN
where fOSC (= 300 kHz) is the oscillation frequency.
2. Capacitors (CIN, COUT)
The capacitor (CIN) inserted on the input side serves to lower the power impedance, average input current, and
suppress back-flow current to the power source. Select the CIN value according to the impedance of the power
supplied, and select a capacitor that has low ESR (Equivalent Series Resistance) and large capacitance. It should
be approximately 47 to 100 μF, although the actual value depends on the impedance of the power source used and
load current value. When the input voltage is low and the load is large, the output voltage may become unstable.
In this case, increase the input capacitance.
For the output side capacitor (COUT), select a large capacitance with low ESR (Equivalent Series Resistance) to
smoothen the ripple voltage. When the input voltage is extremely high or the load current is extremely large, the
output voltage may become unstable. In this case, the unstable area will become narrow by selecting a large
capacitance for an output side capacitor. A tantalum electrolytic capacitor is recommended since the unstable area
widens when a capacitor with a large ESR, such as an aluminum electrolytic capacitor, or a capacitor with a small
ESR, such as a ceramic capacitor, is chosen. The range of the capacitance should generally be approximately 47
to 100 μF.
Fully evaluate input and output capacitors under the actual operating conditions to determine the best value.
Seiko Instruments Inc.
11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet S-8533.PDF ] | |
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