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Part: S-8341C33AFT-T2
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: Control Method = Pwm, Pwm/pfm ;; Operation Start Voltage = 0.9 V ;; Output Voltage = 2.5-6.0V ;; Output Accuracy = ±2.0% ;; Switching Frequency = 300, 600 KHZ ;; Current Consumption Operating = 350 µA (3.3V, 600KHz) ;; Current Consumption Shutdown = 3.0 µA Max. ;; Efficiency Typ. = 87% (Vout=5V) ;; Package = 8-pin Tssop
Company: Seiko Instruments
Datasheet: Download S-8341C33AFT-T2 datasheet File size : 4 kB
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Datasheet text preview:
Rev.2.1_60
PWM Control & PWM/PFM Control S-8340/8341 Series High-Frequency Step-Up Switching Regulator-Controllers
The S-8340/8341 Series consists of CMOS step-up switching regulatorcontrollers with PWM control (S-8340) and PWM/PFM switched control (S8341). These devices contain a reference voltage source, oscillation circuit, error amplifier, phase compensation circuit, PWM control circuit, and other components. Since the oscillation frequency is a high 300 kHz or 600 kHz, with the addition of a small external component, the ICs can function as step-up switching regulators with high efficiency and large output current. The speed of the output stage is enhanced so that the Nch power MOS with a low ON resistance can be switched quickly. The S-8340 provides low-ripple power, high-efficiency, and excellent transient characteristics thanks to a PMW control circuit capable of varying the duty ratio linearly from 0 % to 82 % and optimized error amplifier, and phase compensation circuit. The S-8341 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 ICs 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 & B Series), 300 kHz (C & D Series). · Output voltage: Internally selectable in the range 2.5 V to 6.0 V in steps of 0.1 V (Output voltage fixed output type) · Output voltage precision: ±2.0 % · Output voltage external setting (FB) type available. FB terminal voltage (VFB) 1.0 V · The only peripheral components that can be used with this IC are a transistor, a coil, a diode, capacitors (3), and a resistor. · Duty ratio: 0 % to 82 % typ. PWM control (S-8340) 27 % to 82 % typ. PWM/PFM-switched control (S-8341, A & B Series) 21 % to 82 % typ. PWM/PFM-switched control (S-8341, C & D Series) · Low-voltage operation: Oscillation can start when VDD=0.9 V. · Built-in current limiting circuit: Can be set with an external resistor (RSENSE). · Soft-start function: Can be set with an external capacitor (CSS). · With a power-off function.
Package
· 8-Pin TSSOP (PKG drawing code: FT008-A)
Applications
· Power supplies for PDAs, electronic notebooks, and portable devices. · Power supplies for audio equipment, including portable CD players, portable MD players and headphone stereo equipment. · Main and sub power supplies for notebook computers and peripheral equipment. · Fixed voltage power supply for cameras, video equipment and communications equipment.
Seiko Instruments Inc.
1
PWM Control & PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers S-8340/8341 Series Rev.2.1_60 Block Diagram
L
SD
Triangular wave oscillation circuit PW M comparator Phase compensation circuit
VDD
VOUT
VI N Nch Power MOS FET
EXT
IC internal power supply
VOUT
CC R1 RS SENSE CS
PW M, PWM/PFM switching control circuit
+
Error amplifier
CL R2
RSENSE
120 mV
VREF=1.0 V Voltage/current ref erence
VSS
Power-off circuit
Soft-start circuit
CSS ON /OFF CSS
CVREF CVREF
Figure 1 Block diagram
L
SD
Triangular wave oscillation circuit PW M comparator Phase compensation circuit
VDD
VOUT
VI N Nch Power MOS FET
EXT
IC internal power supply
RS SENSE CS
120 mV PW M, PWM/PFM switching control circuit
CFB
Error amplifier
RFB1
+
FB RFB2
CL
RSENSE
VREF=1.0 V Voltage/current ref erence
Power-off circuit
Soft-start circuit
VSS
CSS ON /OFF CSS
CV R E F CVREF
Figure 2 Block diagram
2
Seiko Instruments Inc.
PWM Control & PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers Rev.2.1_60 S-8340/8341 Series Selection Guide
1. Product Name
S-834X X
XX A FT - T2
Taping specifications Package type Output voltage × 10 A;Output voltage fixed output type, fosc=600 kHz B;Output voltage external setting type, fosc=600 kHz C;Output voltage fixed output type, fosc=300 kHz D;Output voltage external setting type, fosc=300 kHz 0; PW M control 1; PW M/PFM-switched control
2. Product List 2-1. Output voltage fixed output type Item Output Voltage (V) 2.5 V ± 2.0 % 3.0 V ± 2.0 % 3.3 V ± 2.0 % 5.0 V ± 2.0 % 5.6 V ± 2.0 % 6.0 V ± 2.0 % S-8340AXXAFT Series fosc = 600 kHz PWM control S-8340A25AFT-T2 S-8340A30AFT-T2 S-8340A33AFT-T2 S-8340A50AFT-T2 S-8340A56AFT-T2 S-8340A60AFT-T2 S-8341AXXAFT Series fosc = 600 kHz PWM/PFM-switched control S-8341A25 AFT-T2 S-8341A30 AFT-T2 S-8341A33 AFT-T2 S-8341A50 AFT-T2 S-8340CXXAFT Series fosc = 300 kHz PWM control S-8340C25AFT-T2 S-8340C30AFT-T2 S-8340C33AFT-T2 S-8340C50AFT-T2 S-8340C60AFT-T2 S-8341CXXAFT Series fosc = 300 kHz PWM/PFM-switched control S-8341C25 AFT-T2 S-8341C30 AFT-T2 S-8341C33 AFT-T2 S-8341C50 AFT-T2
For the availability of other output voltage product, contact the SII Sales Department.
2.2. Output voltage external setting type S-8340B00AFT-T2 S-8341B00AFT-T2 S-8340D00AFT-T2 S-8341D00AFT-T2 : : : : fosc = 600 kHz, PWM control fosc = 600 kHz, PWM/PFM-switched control fosc = 300 kHz, PWM control fosc = 300 kHz, PWM/PFM-switched control
Seiko Instruments Inc.
3
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