ETA8113是一种输入范围广、效率高、效率高的电子产品变频直流降压开关稳压器，能够提供高达3A的输出电流。它采用自适应COT控制方案非常快速的瞬态响应，并提供非常输出从轻负载变化时的平滑过渡负重。轻载时，ETA8113进入省去开关损耗的PFM模式效率。自适应COT控制还保持线路和负载的恒定开关频率。OVP功能保护IC本身及其下游系统对输入电压浪涌。用这个OVP功能上，IC可以隔离高达19V，是工业生产的理想解决方案应用如液晶电视、机顶盒、便携式电视、，等。ETA8113有SOT23-6封装.
特性：
宽输入范围：4.5V-18V 自适应COT控制 超快负载瞬态响应
轻载时的高效PFM模式 高效同步运行
低Rdson内部功率FET 能够输送3A 热关机和UVLO 无需外部补偿
SOT23-6包装提供
PW2163，宽输入范围：4.5V-18V，能够输出3A电流；
ETA8113，宽输入范围：4.5V-18V，能够输出3A电流。脚位PIN to PIN
GENERAL DESCRIPTION
The PW2163 is a high efficiency 500 kHz synchronous step-down DC-DC converter capable of delivering 3A current. The PW2163 operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. Low output voltage ripple and small external inductor and capacitor sizes are achieved with 500 kHz switching frequency. It adopts the instant PWM architecture to achieve fast transient responses for high step down applications
FEATURES
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low RDS(ON) for internal switches (top/bottom): 80m?/40m?
4.5-18V input voltage range 3A output current capability 500 kHz switching frequency
Instant PWM architecture to achieve fast transient responses. Cycle-by-cycle peak current limitation Internal softstart limits the inrush current SOT23-6 package
APPLICATIONS
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Set Top Box Portable TV
Access Point Router DSL Modem LCD TV
TYPICAL APPLICATION CIRCUIT
VIN
GNDC10.1UFL1Vout：5V110K 1%PW21631BSVINENSWFBGND632R1C222pF(optional)
CIN5ONOFF4COUT15k 1%R2GND PIN ASSIGNMENT/DESCRIPTION
BSSWVINEN16
GNDFB2354
RECOMMANDED OPERATING Conditions (note3)
Parameter Supply Input Voltage Junction Temperature Range Ambient Temperature Range VALUE 4.5V to 18V -40°C to 125°C -40°C to 85°C Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Note 2: θJA is measured in the natural convection at TA = 25°C on a low effective 4-layer thermal conductivity test
board of JEDEC 51-3 thermal measurement standard. Pin2 of TSOT23-6 packages is the case position for θJC measurement.
Note 3: The device is not guaranteed to function outside its operating conditions
ELECTRICAL CHARACTERISTICS
(VIN = 12V, VOUT = 1.2V, L = 2.??H, COUT = 10uF, TA = 25°C, IOUT =1.?0A unless otherwise specified.)
Parameter Input Voltage Range Quiescent Current Symbol VIN IQ Test Conditions Min Typ 4.5 Max Unit 18 10 50 90 50 6 4.25 V μA IOUT=0, VFB=VREF*105% 100 5 -50 Shutdown Current Feedback Reference Voltage FB Input Current Top FET RON Bottom FET RON Top FET PeakCurrent Limit Bottom FET Valley Current Limit EN Rising Threshold EN Falling Threshold Input UVLO Threshold UVLO Hysteresis Switching Frequency Min ON Time Min Off Time Soft-start Time Thermal Shutdown Hysteresis ISHDN VREF IFB RDS(ON)1 RDS(ON)2 ILIM,TOP ILIM VENH VENL VUVLO VHYS FSW tON tOFF tSS THYS EN=0 μA nA m? m? A A V V V V MHz ns ns ms °C °C VFB=3.3V 0.591 0.6 0.609 V 80 40 3 1.5 50 140 0.3 0.5 80 170 800 150 15 0.4 4.5 120 220 Thermal Shutdown Temperature TSD
Typical Performance Characteristics
959010095
90
8580
7570
0.01
0.10
VIN=6V,VOUT=5VVIN=12V,VOUT=5VVIN=16V,VOUT=5V1.0010.00
Load Current (A)
Efficiency vs. Load Current
Efficiency vs. Load Current
85 80 75 70 65 60
0.01
SW
VIN=5V,VOUT=1.2VVIN=12V,VOUT=1.2VVIN=16V,VOUT=1.2V0.101.0010.00
Load Current (A)
Efficiency vs. Load Current Output Ripple
Load Transient Load Transient
SW
Startup
Shutdown
(VIN=12V, VOUT=3.3V, Open to Short)VOUT 2V/div(VIN=12V, VOUT=3.3V, 3A to Short)VOUT 2V/divSW
IL 1A/divIL 1A/divTime (2ms/div) Short Circuit Protection
Function Block Time (2ms/div)Short Circuit Protection
VIN
SWBS
ENFBGND
Operation
PW2163 is a synchronous buck regulator IC that integrates the PWM control, top and bottom switches on the same die to minimize the switching transition loss and conduction loss. With ultra low Rds(on) power switches and proprietary PWM control, this regulator IC can achieve the highest efficiency and the highest switch frequency simultaneously to minimize the external inductor and capacitor size, and thus achieving the minimum solution footprint.
PW2163 provides protection functions such as cycle by cycle current limiting and thermal shutdown protection. PW2163 will sense the output voltage conditions for the fault protection.
Application Information
Because of the high integration in the PW2163 IC, the application circuit based on this regulator IC is rather simple. Only input capacitor CIN, output capacitor COUT, output inductor L and feedback resistors (R1 and R2) need to be selected for the targeted applications specifications.
External Boostrap Cap
This capacitor provides the gate driver voltage for internal high side MOSEFET. A 100nF low ESR ceramic capacitor connected between BS pin and SW pin is recommended.
Load Transient Considerations:
The PW2163 regulator IC integrates the compensation components to achieve good stability and fast transient responses. In some applications, adding a 22pF ceramic cap in parallel with R1 may further speed up the load transient responses and is thus recommended for applications with large load transient step requirements
Feedback Resistor Divider R1 and R2
Choose R1and R2 to program the proper output voltage. To minimize the power consumption under light loads, it is desirable to choose large resistance values for both R1 and R2. A value of between 10k? and 1M? is highly recommended for both resistors. If Vout is 3.3V, R1=100k is chosen, then using following equation, R2 can be calculated to be 22.1k:
????????=(1+
??1
)?0.6 ??2
Input capacitor CIN:
The ripple current through the input capacitor is calculated as： ICIN_RMS=IOUT?D(1?D).
To minimize the potential noise problem, place a typical X5R or better grade ceramic capacitor really close to the VIN and GND pins. Care should be taken to minimize the loop area formed by CIN, and VIN/GND pins. In this case, a 10uF low ESR ceramic capacitor is recommended.
Output capacitor COUT:
The output capacitor is selected to handle the output ripple noise requirements. Both steady state ripple and transient requirements must be taken into consideration when selecting this capacitor. For the best performance, it is recommended to use X5R or better grade ceramic capacitor greater than 22uF capacitance.
Output inductor L:
There are several considerations in choosing this inductor.
1) Choose the inductance to provide the desired ripple current. It is suggested to choose the ripple current to be about 40% of the maximum output current. The inductance is calculated as:
V(1?VOUT/VIN,MAX) L=OUT FSW×IOUT,MAX×40%
where Fsw is the switching frequency and IOUT,MAX is the maximum load current.
The PW2163 regulator IC is quite tolerant of different ripple current amplitude. Consequently, the final choice of inductance can be slightly off the calculation value without significantly impacting the performance.
2) The saturation current rating of the inductor must be selected to be greater than the peak inductor current under full load conditions.
VOUT(1-VOUT/VIN,MAX) ISAT,MIN>IOUT,MAX+
2?FSW?L 3)The DCR of the inductor and the core loss at the switching frequency must be low enough to achieve the desired efficiency requirement. It is desirable to choose an inductor with DCR<50m? to achieve a good overall efficiency.
PACKAGE DESCRIPTION
SOT23-6L
Symbol A A1 A2 b c D E E1 e e1 L 1.800 0.300 0° Dimensions In Millimeters Min 0.900 0.000 0.900 0.300 0.100 2.800 1.500 2.650 0.950(BSC) 2.000 0.600 8° Max 1.450 0.150 1.300 0.500 0.200 3.000 1.700 2.950 θ
ETA8113兼容芯片说明书 - 图文
