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
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V or 1.5V conversion
•1% initial accuracy
1. In
2. Gnd
3. Out
•Low ground current
•Current limiting and thermal shutdown
TO263-5L / TL220-5L
(39301-x.x & 39302 only)
•Reversed-battery protection
•Reversed-leakage protection
•Fast transient response
•TTL/CMOS compatible enable pin
-LM39301 only
•Error flag output
- LM39301 only
•Adjustable version
- LM39302 only
•TO-263 and TO-220 packaging
1.
2.
3.
4.
5.
En
In
Gnd
Out
Flg or Adj
APPLICATIONS
•LDO linear regulator for PC add-in cards
•High-efficiency linear power supplies
•Multimedia and PC processor supplies
•SMPS post regulator
•Low-voltage microcontrollers
•StrongARM™ processor supply
PIN DESCRIPTION
CMOS-compatible control input.
Enable
(Input)
IN
GND
OUT
FLG
ADJ
Logic high = enable, logic
Logic low or open = Shutdown
Supply (Input): +16V maximum supply
Ground pin and TAB are internally connected.
Regulator Output
Flag (Output): Open-collector error flag output.
Adjustment Input: Feedback input.
ORDERING INFORMATION
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).
Device
LM39300R- X.X
LM39300T-X.X
LM39301R-X.X
LM39301T-X.X
LM39302R-Adj
LM39302T-Adj
Marking
LM39300-X.X
LM39300-X.X
LM39301-X.X
LM39301-X.X
LM39302-Adj
LM39302-Adj
Package
TO-263
TO-220
TO-263
TO-220
TO-263
TO-220
* 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(θ
JC
) : 2°C/W
TO-220(θ
JC
) : 2°C/W
HTC
2
3A Low-Voltage Low-Dropout Regulator
Note
Note
Note
Note
Note
Note
Note
Note
Note
LM39300/39301/39302
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. P
D(max)
= (T
J(max)
– T
A
)
θ
JA
, where
θ
JA
depends upon the printed circuit layout. See “Applications Information.”
5.Vout temperature coefficient is ∆V
OUT(worst case)
(T
J(max)
– T
J(min)
) where T
J(max)
is +125℃ and T
J(min)
is 0℃
6. V
DO
= V
IN
– V
OUT
when V
OUT
decreases to 99% of its nominal output voltage with V
IN
= V
OUT
+ 1V.
7. I
GND
is the quiescent current. IIN = I
GND
+ I
OUT
.
8. V
EN
0.8V, V
IN
8V, and V
OUT
= 0V
9. For a 2.5V device, V
IN
= 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
PCB设计
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