|
|
PDF S-8340 Data sheet ( Hoja de datos )
| Número de pieza | S-8340 | |
| Descripción | PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER | |
| Fabricantes | Seiko Instruments USA | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de S-8340 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
Rev.3.1_00
www.DataSheet4U.com
STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM
SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8340/8341 Series
The S-8340/8341 Series is a CMOS step-up switching regulator
controller which mainly consists of a reference voltage source,
oscillation circuit, error amplifier, phase compensation circuit, PWM
control circuit (S-8340 Series), and PWM/PFM switching control circuit
(S-8341 Series).
Since the oscillation frequency is a high 300 kHz or 600 kHz, with the
addition of a small external part, the S-8340/8341 Series functions as a
highly efficient step-up switching regulator with a high output current.
The speed of the output stage is enhanced so that the N-channel
power MOS with a low on-resistance can be switched quickly.
The S-8340 Series realizes low ripple, high efficiency, and excellent
transient characteristics thanks to a PMW control circuit capable of
varying the duty ratio linearly from 0 to 82%, optimized error amplifier,
and phase compensation circuit.
The S-8341 Series contains a PWM/PFM switching control circuit so
that it operates using PWM control with a duty ratio of 27% or higher
and using PFM control with a duty ratio of lower than 27% to ensure
high efficiency in all load ranges.
These S-8340/8341 Series serve as ideal main power supply units for
portable devices when coupled with the 8-Pin TSSOP package and
high oscillation frequencies.
Features
• Oscillation frequency : 600 kHz (A and B types), 300 kHz (C and D types).
• Output voltage :
Selectable in 0.1 V steps between 2.5 to 6.0 V (output voltage fixed output type)
• Output voltage accuracy : ±2.0%
• Output voltage external setting (FB) type available. FB terminal voltage (VFB) 1.0 V
• External parts :
Coil, diode, capacitors (3), transistor, and resistor only
• Duty ratio :
0 to 82% (typ.) PWM control (S-8340 Series)
27 to 82% (typ.) PWM/PFM switching control (S-8341 Series A and B types)
21 to 82% (typ.) PWM/PFM switching control (S-8341 Series C and D types)
• Low-voltage operation: Oscillation guaranteed to start when VDD = 0.9 V
• Built-in current limit circuit: Can be set with an external resistor (RSENSE)
• Soft-start function set by an external capacitor (CSS)
• Shutdown function
• Lead-free products
Applications
• Power supplies for portable equipments such as PDAs, electronic notebooks, and cellular phones
• Power supplies for audio equipments such as portable CD players, portable MD players, and headphone stereos
• Main or local power supplies for notebook PCs and peripherals
• Constant voltage power supplies for cameras, VCRs, and communication devices
Package
Package Name
8-Pin TSSOP
Package
FT008-A
Drawing Code
Tape
FT008-E
Reel
FT008-E
Seiko Instruments Inc.
1
1 page  
www.DataSheet4U.com
STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.3.1_00
S-8340/8341 Series
Absolute Maximum Ratings
Table 4
Parameter
VDD pin voltage
VOUT pin voltage
FB pin voltage
CVREF pin voltage
CSS pin voltage
ON/OFF pin voltage
SENSE pin voltage
EXT pin voltage
EXT pin current
Power dissipation
Symbol
VDD
VOUT
VFB
VCVREF
VCSS
VON/OFF
VSENSE
VEXT
IEXT
PD
Operating ambient temperature
Tdpr
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 + 12
VSS − 0.3 to VSS + 12
VSS − 0.3 to VSS + 12
VSS − 0.3 to VDD + 0.3
VSS − 0.3 to VDD + 0.3
VSS − 0.3 to VSS + 12
VSS − 0.3 to VSS + 12
VSS − 0.3 to VDD + 0.3
±100
V
V
V
V
V
V
V
V
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 4 Power Dissipation of Packages
Seiko Instruments Inc.
5
5 Page 
www.DataSheet4U.com
STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.3.1_00
S-8340/8341 Series
External parts
Coil :
Sumida Corporation CD54 (10 μH)
Diode :
Matsushita Electronic Industrial Co., Ltd. MA735 (Schottky type)
Capacitor :
Nichicon Corporation F93 (16 V, 47 μF, tantalum type)
Transistor :
Sanyo Electric Co., Ltd. 2SD1628G
Base resistor (Rb) : 1.0 kΩ
Base capacitor (Cb) : 2200 pF (ceramic type)
CVREF :
0.01 μF
CSS :
4700 pF
The VDD pin is connected to the VOUT pin.
The ON/OFF pin is connected to the VOUT pin unless otherwise specified.
Connect the SENSE pin to the VSS pin.
*1. VOUT(S) : Set output voltage value
VOUT(E) : Actual output voltage value : Output voltage value when IOUT = VOUT(S)/50 Ω and VIN = VOUT(S) × 0.6.
*2. The change of output voltage with temperature [mV/°C] is calculated from the following formula.
ΔVOUT
ΔTa
[mV/°C] =
VOUT(S) [V]
×
ΔVOUT
ΔTa • VOUT
[ppm/°C]
÷ 1000
(Change of output voltage (Set output voltage (Output voltage temperature
with temperature)
value)
coefficient)
Caution
The S-8340/8341 Series steps up from VDD = 0.9 V. However, 2.5 V or more for VDD is recommended to
stabilize the output voltage and oscillation frequency. If VDD is taken from VIN or other power sources,
instead of VOUT, VDD should be 2.5 V or more. However, if VDD is not taken from VOUT, note that the output
voltage accuracy of ±2.0% is not guaranteed due to dependency of output voltage on VDD. In particular,
accuracy of output voltage is degraded significantly when the VDD voltage is 6.0 V or more. Therefore, do
not use this IC when the VDD voltage is 6.0 V or more. If VDD of 2.5 V or more is applied, increase power
supply so that VDD becomes 2.5 V or more within the soft-start time (6.0 ms).
Seiko Instruments Inc.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet S-8340.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| S-8340 | PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER | Seiko Instruments USA |
| S-8341 | PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER | Seiko Instruments USA |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |