sc46208a33 Silan, sc46208a33 Datasheet

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sc46208a33

Manufacturer Part Number
sc46208a33
Description
1.5mhz, 600ma, High Efficiency Synchronous Step-down Dc-dc Converter
Manufacturer
Silan
Datasheet
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
1.5MHz, 600mA, HIGH EFFICIENCY SYNCHRONOUS STEP-DOWN DC-DC
CONVERTER
DESCRIPTION
efficiency. It adopts small flat package. The device features 2.5~5.5V
input voltage, 600mA output current, peak current mode PWM and
integrated compensation net, which is ideal for powering portable
equipment that runs from a single cell Li+ battery without external
components.
Schottky diode, 1.5MHz high frequency allows the periphery to adopt
SMT inductor and capacitor, thus reduce the size of total solution. It
can also run at 100% duty cycle for low dropout operation, that is
lower than 1μA shutdown current and 20μA quiescent current in power
saving mode. It extends battery life in portable system through
increasing the efficiency under light loads.
FEATURES
SC46208 is a synchronous step-down DC-DC converter with high
The device integrates an internal switch which eliminates the
SC46208 is available in an adjustable version and fixed version.
* High efficiency up to 95%
* Wide input voltage range: +2. 5V~+5.5V
* Low dropout operation: 100%
* Shutdown current<1μA
* 1.5MHz fixed frequency
* No Schottky diode required
* Thermal shutdown protection
* 4KV HBM ESD protection
* Small 5-pin SOT-23package
* Automatic Power Saving Mode at light loads, only 20μA quiescent
* Output voltage range: 0.6V~V
* High output current 600mA
current.
IN
APPLICATION
* Cellular Telephones
* PDAs
* Wireless Equipment
* MP3 player
* Digital Camera
* Portable Instruments
REV:1.0
SC46208
Page 1 of 11
2008.02.29

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sc46208a33 Summary of contents

Page 1

... High output current 600mA * Low dropout operation: 100% * Shutdown current<1μA * 1.5MHz fixed frequency * No Schottky diode required * Thermal shutdown protection * 4KV HBM ESD protection * Small 5-pin SOT-23package HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn SC46208 APPLICATION * Cellular Telephones * PDAs * Wireless Equipment * MP3 player ...

Page 2

... ORDERING INFORMATION Device no SC46208 SC4620810 SC4620812 SC46208XX SC4620815 SC4620818 SC4620825 SC4620833 SC46208A SC46208A10 SC46208A12 SC46208AXX SC46208A15 SC46208A18 SC46208A25 SC46208A33 BLOCK DIAGRAM HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn Seal name Package 6208 SOT-23-5 20810 SOT-23-5 20812 SOT-23-5 20815 SOT-23-5 20818 SOT-23-5 20825 ...

Page 3

... PMOS On Resistor NMOS On Resistor PMOS Limit Current Switch Frequency Max. Duty Switch Leakage Current SW EN Input High Level EN Input Low Level EN Leakage Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis Temperature HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn Symbol ...

Page 4

... PMOS switch on in one cycle and the duty reaches 100%. The output voltage then is the input voltage minus the voltage drop across the PMOS switch and the inductor. Short Circuit Protection When the output is short to ground, the frequency of internal oscillator decreases to 270KHz in order to remain HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn FB/V V ...

Page 5

... Ceramic capacitor is the best selection for input capacitor, and the capacitor should be as near as possible to chip. A 4.7μF ceramic capacitor is sufficient for most applications. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn : OUT − ...

Page 6

... Higher impedance reduces the quiescent current (I=0.6V/R2), and lower resistance gives better noise immunity, and is less sensitive to interference, layout parasitics and FB node leakage current. A proper value of feed-forward capacitor C1 can improve the noise immunity of the feedback loops, especially in an improper layout. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn SC46208 R1 ...

Page 7

... Fig. 1 Output voltage adjustable regulator, single battery to 2.5V converter Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn : Fig.2 Output voltage fixed regulator SC46208 REV:1 ...

Page 8

... TYPICAL ELECTRICAL CHARACTERISTICS CURVES HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn SC46208 (T =25°C, unless otherwise specified) amb Efficiency VS Input Voltage of SC46208A 100 95 I =100mA OUT 90 I =600mA OUT =10mA OUT =1.8V OUT Input Voltage(V) REV:1.0 ...

Page 9

... TYPICAL ELECTRICAL CHARACTERISTICS CURVES HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn SC46208 (T =25°C, unless otherwise specified) amb REV:1.0 Page 2008.02.29 ...

Page 10

... TYPICAL ELECTRICAL CHARACTERISTICS CURVES Output Ripple Voltage V OUT (5mV/DIV) SW (5V/DIV (500mA/DIV) Time(500ns/DIV) V =3. =1.2V OUT I =600mA LOAD HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn SC46208 (T =25°C, unless otherwise specified) amb REV:1.0 Page 2008.02.29 ...

Page 11

... All tools used during assembly, including soldering tools and solder baths, must be earthed. • MOS devices should be packed for dispatch in antistatic/conductive containers. Note:Silan reserves the right to make changes without notice in this specification for the improvement of the design and performance. Silan will supply the best possible product for customers. ...

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