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產(chǎn)品型號LM39300的Datasheet PDF文件預(yù)覽

3A Low-Voltage Low-Dropout Regulator  
LM39300/39301/39302  
TO263-3L / TO220-3L  
(39300-x.x Fixed only)  
FEATURES  
?3A minimum guaranteed output current  
?500mV typical dropout at 3A  
1. In  
2. Gnd  
3. Out  
Ideal for 3.0V to 2.5V conversion  
Ideal for 2.5V to 1.8V or 1.5V conversion  
?1% initial accuracy  
?Low ground current  
TO263-5L / TL220-5L  
(39301-x.x & 39302 only)  
?Current limiting and thermal shutdown  
?Reversed-battery protection  
?Reversed-leakage protection  
?Fast transient response  
1. En  
2. In  
?TTL/CMOS compatible enable pin-LM39301 only  
?Error flag output - LM39301 only  
?Adjustable version - LM39302 only  
?TO-263 and TO-220 packaging  
3. Gnd  
4. Out  
5. Flg or Adj  
PIN DESCRIPTION  
APPLICATIONS  
CMOS-compatible control input.  
Logic high = enable, logic  
Enable  
?LDO linear regulator for PC add-in cards  
?High-efficiency linear power supplies  
?Multimedia and PC processor supplies  
?SMPS post regulator  
(Input)  
Logic low or open = Shutdown  
IN  
Supply (Input): +16V maximum supply  
Ground pin and TAB are internally connected.  
Regulator Output  
GND  
OUT  
FLG  
ADJ  
?Low-voltage microcontrollers  
?StrongARM? processor supply  
Flag (Output): Open-collector error flag output.  
Adjustment Input: Feedback input.  
ORDERING INFORMATION  
Marking  
Device  
Package  
TO-263  
TO-220  
TO-263  
TO-220  
TO-263  
TO-220  
LM39300R- X.X  
LM39300T-X.X  
LM39301R-X.X  
LM39301T-X.X  
LM39302R-Adj  
LM39302T-Adj  
LM39300-X.X  
LM39300-X.X  
LM39301-X.X  
LM39301-X.X  
LM39302-Adj  
LM39302-Adj  
DESCRIPTION  
The LM39300, LM39301 and LM39302 are 3.0A  
low-dropout linear voltage regulators that provide  
a low voltage, high-current output with a  
minimum of external components.  
The LM39300/1 offers extremely low dropout  
(typically 400mV at 3.0A) and low ground current  
(typically 36mA at 3.0A).  
* X.X = Fixed Vout = 1.5V, 1.8V, 2.5V, 3.3V, 5.0V  
The LM39300/1/2 is ideal for PC add-in cards that need to convert from standard 5V or 3.3V down to new,  
lower core voltages. A guaranteed maximum dropout voltage of 500mV over all operating conditions allows  
the LM39300/1/2 to pro-vide 2.5V from a supply as low as 3V.  
The LM39300/1/2 also has fast transient response for heavy switching applications.The device requires  
only 47F of output capacitance to maintain stability and achieve fast transient responseThe LM39300/1 is  
fully protected with over current limiting,thermal shutdown, reversed-battery protection, reversed-leakage  
protection, and reversed-lead insertion. The LM39301 offers a TTL-logic compatible enable pin and an  
error flag that indicates under voltage and over current conditions. Offered in fixed voltages, the  
LM39300/1/2 comesin the TO-220 and TO-263 packages and is an ideal upgrade to older, NPN-based  
linear voltage regulators.  
HTC  
1
3A Low-Voltage Low-Dropout Regulator  
LM39300/39301/39302  
Typical Application Circuit  
LM39300  
LM39301  
LM39302  
Absolute Maximum Ratings (Note 1)  
Supply Voltage (VIN) : –20V to +20V  
Enable Voltage (VEN) : +20V  
Storage Temperature (TS) : –65°C to +150°C  
Lead Temperature (soldering, 5 sec) : 260°C  
ESD, Note 3  
Operating Ratings (Note 2)  
Supply Voltage (VIN) : +2.25V to +16V  
Enable Voltage (VEN) : +16V  
Maximum Power Dissipation (PD(max)) Note 4  
Junction Temperature (TJ) : –40°C to +125°C  
Package Thermal Resistance  
TO-263(θJC) : 2°C/W  
TO-220(θJC) : 2°C/W  
HTC  
2
3A Low-Voltage Low-Dropout Regulator  
LM39300/39301/39302  
Block Diagram  
LM39300 Fixed (1.5V,1.8V,2.5V,3.3V,5.0V)  
LM39301 Fixed with Flag and Enable  
LM39302 Adjustable  
HTC  
3
3A Low-Voltage Low-Dropout Regulator  
LM39300/39301/39302  
550  
HTC  
4
3A Low-Voltage Low-Dropout Regulator  
LM39300/39301/39302  
Note 1. Exceeding the absolute maximum ratings may damage the device.  
Note 2. The device is not guaranteed to function outside its operating rating.  
Note 3. Devices are ESD sensitive. Handling precautions recommended.  
Note 4. PD(max) = (TJ(max) – TA) θJA, where θJA depends upon the printed circuit layout. See “Applications Information.”  
Note 5.Vout temperature coefficient is ?VOUT(worst case) (TJ(max) – TJ(min)) where TJ(max) is +125℃ and TJ(min) is 0℃  
Note 6. VDO = VIN – VOUT when VOUT decreases to 99% of its nominal output voltage with V IN = VOUT + 1V.  
Note 7. IGND is the quiescent current. IIN = IGND + IOUT.  
Note 8. VEN 0.8V, VIN 8V, and VOUT = 0V  
Note 9. For a 2.5V device, VIN = 2.250V (device is in dropout).  
Note 10.VREF ≤ VOUT ≤ (VIN – 1V), 2.25V ≤ VIN ≤ 16V, 10mA ≤ IL ≤ 1A, TJ = TMAX.  
TYPICAL PERFORMANCE CHARACTERISTICS  
HTC  
5
3A Low-Voltage Low-Dropout Regulator  
LM39300/39301/39302  
HTC  
6
3A Low-Voltage Low-Dropout Regulator  
LM39300/39301/39302  
APPLICATION INFORMATION  
The LM39300/1 is a high-performance low-dropout voltage regulator suitable for moderate to high-current voltage  
regu-lator applications. Its 500mV dropout voltage at full load makes it especially valuable in battery-powered  
systems and as a high-efficiency noise filter in post-regulator applications. Unlike older NPN-pass transistor  
designs, where the mini-mum dropout voltage is limited by the base-to-emitter voltage drop and collector-to-  
emitter saturation voltage, dropout per-formance of the PNP output of these devices is limited only by the low V CE  
saturation voltage.A trade-off for the low dropout voltage is a varying base drive requirement. The LM39300/1/2  
regulator is fully protected from damage due to fault conditions. Current limiting is provided. This limiting is linear  
output current during overload conditions is constant. Thermal shutdown disables the device when the die  
temperature exceeds the maximum safe operating tem-perature. Transient protection allows device (and load) sur-  
vival even when the input voltage spikes above and below nominal. The output structure of these regulators allows  
voltages in excess of the desired output voltage to be applied without reverse current flow.  
Thermal Design  
Linear regulators are simple to use. The most complicated design parameters to consider are thermal  
characteristics.Thermal design requires four application-specific param-eters:  
?Maximum ambient temperature (TA)  
?Output Current (IOUT)  
?Output Voltage (VOUT)  
?Input Voltage (VIN)  
?Ground Current (IGND)  
Calculate the power dissipation of the regulator from these numbers and the device parameters from this  
datasheet,where the ground current is taken from the data sheet.  
PD = (VIN – VOUT) IOUT + VIN·IGND  
The heat sink thermal resistance is determined by:  
θSA=(TJMAX-TA)/PD -(θJC+θCS)  
where TJ (max) 125 ℃ and θCS is between 0℃ and 2℃/W.  
The heat sink may be significantly reduced in applications where the minimum input voltage is known and is large  
compared with the dropout voltage. Use a series input resistor to drop excessive voltage and distribute the heat  
between this resistor and the regulator. The low dropout properties of Taejin regulators allow signifi-cant reductions  
in regulator power dissipation and the asso-ciated heat sink without compromising performance. When this  
technique is employed, a capacitor of at least 1.0F is needed directly between the input and regulator ground.Refer  
to Application Note 9 for further details and examples on thermal design and heat sink specification.  
Output Capacitor  
The LM39300/1/2 requires an output capacitor to maintain stability and improve transient response. Proper capacitor  
selection is important to ensure proper operation. The LM39300/1/2 output capacitor selection is dependent upon  
the ESR (equivalent series resistance) of the output capacitor to maintain stability. When the output capacitor is 47F  
or greater, the output capacitor should have less than 1 of ESR. This will improve transient response as well as  
promote stability. Ultralow ESR capacitors, such as ceramic chip capacitors may promote instability. These very low  
ESR levels may cause an oscillation and/or underdamped tran-sient response. A low-ESR solid tantalum capacitor  
works extremely well and provides good transient response and stability over temperature. Aluminum electrolytics can  
also be used, as long as the ESR of the capacitor is < 1.The value of the output capacitor can be increased without  
limit. Higher capacitance values help to improve transient response and ripple rejection and reduce output noise.  
Input Capacitor  
An input capacitor of 1F or greater is recommended when the device is more than 4 inches away from the bulk ac  
supply capacitance, or when the supply is a battery. Small, surface-mount, ceramic chip capacitors can be used for  
the bypass-ing. Larger values will help to improve ripple rejection by bypassing the input to the regulator, further  
improving the integrity of the output voltage.Transient Response and 3.3V.  
Fig 1. Capacitor Requirements  
HTC  
7
3A Low-Voltage Low-Dropout Regulator  
LM39300/39301/39302  
Minimum Load Current  
The LM39300/1/2 regulator is specified between finite loads.  
If the output current is too small, leakage currents dominate and the output voltage rises.  
A 10mA minimum load current is necessary for proper regulation.  
Transient Response and 3.3V to 2.5V Conversion  
The LM39300/1/2 has excellent transient response to varia-tions in input voltage and load current. The device has  
been designed to respond quickly to load current variations and input voltage variations. Large output capacitors are  
not required to obtain this performance. A standard 47F output capacitor, preferably tantalum, is all that is required.  
Larger values help to improve performance even further.By virtue of its low-dropout voltage, this device does not  
saturate into dropout as readily as similar NPN-based de-signs. When converting from 3.3V to 2.5V, the NPN-based  
regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater. To convert down to  
2.5V without operating in dropout, NPN-based regulators require an input voltage of 3.7V at the very least. The  
LM39300/1/2 regulator will provide excellent performance with an input as low as 3.0V. This gives the PNP-based  
regulators a distinct advantage over older, NPN-based linear regulators.  
Error Flag  
The LM39301 version features an error flag circuit which monitors the output voltage and signals an error condition  
when the voltage drops 5% below the nominal output voltage. The error flag is an open-collector output that can sink  
10mA during a fault condition.Low output voltage can be caused by a number of problems, including an overcurrent  
fault (device in current limit) or low input voltage. The flag is inoperative during overtemperature shutdown.  
Enable Input  
The LM39301 version features an enable input for on/off control of the device. Its shutdown state draws “zero” current  
(only microamperes of leakage). The enable input is TTL/ CMOS compatible for simple logic interface, but can be  
connected to up to 20V. When enabled, it draws approxi-mately 15A.  
Adjustable Regulator Design  
The LM39302 allows programming the output voltage any-where between 1.25V and the 16V maximum operating  
rating of the family. Two resistors are used. Resistors can be quite large, up to 1M?, because of the very high input  
impedance and low bias current of the sense comparator: The resistor values are calculated by : R1=R2(Vout/1.250-  
1)  
Where VO is the desired output voltage. Figure 1 shows component definition. Applications with widely varying load  
currents may scale the resistors to draw the minimum load current required for proper operation (see below).  
HTC  
8
配單直通車
LM39300R-1.5V產(chǎn)品參數(shù)
型號:LM39300R-1.5V
生命周期：Contact Manufacturer
包裝說明：TO-263, 3 PIN
Reach Compliance Code：unknown
ECCN代碼：EAR99
HTS代碼：8542.39.00.01
風(fēng)險等級：5.68
最大回動電壓 1：0.55 V
最大輸入電壓：16 V
最小輸入電壓：2.25 V
JESD-30 代碼：R-PSSO-G3
功能數(shù)量：1
端子數(shù)量：3
工作溫度TJ-Max：125 °C
工作溫度TJ-Min：-40 °C
最大輸出電流 1：3 A
最大輸出電壓 1：1.53 V
最小輸出電壓 1：1.47 V
標(biāo)稱輸出電壓 1：1.5 V
封裝主體材料：PLASTIC/EPOXY
封裝代碼：TO-263
封裝形狀：RECTANGULAR
封裝形式：SMALL OUTLINE
調(diào)節(jié)器類型：FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
表面貼裝：YES
端子形式：GULL WING
端子位置：SINGLE
Base Number Matches：1
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