|
|
PDF LM39102 Data sheet ( Hoja de datos )
| Número de pieza | LM39102 | |
| Descripción | 1A Low-Voltage Low-Dropout Regulator | |
| Fabricantes | HTC | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LM39102 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
1A Low-Voltage Low-Dropout Regulator LM39100/39101/39102
FEATURES
z Fixed and adjustable output voltages to 1.24V
z 410mV typical dropout at 1A
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V or 1.5V conversion
z 1A minimum guaranteed output current
z 1% initial accuracy
z Low ground current
z Current limiting and thermal shutdown
z Reversed-battery protection
z Reversed-leakage protection
z Fast transient response
z Low-profile SOT-223 package
z Moisture Sensitivity Level 3
SOT-223 PKG
TO-252 3L / 5L PKG
SOP-8 PKG
APPLICATION
z Battery Powered Equipments
z Motherboards and Graphic Cards
z Microprocessor Power Supplies
z Peripheral Cards
z High Efficiency Linear Regulators
z Battery Chargers
ORDERING INFORMATION
Device
LM39100S-X.X
LM39100GS-X.X
LM39100RS-X.X
LM39100GRS-X.X
LM39101RS-X.X
LM39101GRS-X.X
LM39102RS
LM39102GRS
Package
SOT-223
TO-252 3L
TO-252 5L
DESCRIPSION
LM39101D-X.X
LM39102D
SOP-8
The LM39100/1/2 is 1A low-dropout linear voltage
X.X = Output Voltage = 1.5, 1.8, 2.5, 3.3, 5.0
regulators that provide low-voltage, high-current output.
The LM39100/1/2 offers extremely low dropout (typically 410mV at 1A) and low ground current (typically 12mA
at 1A). The LM39100 is a fixed output regulator offered in the SOT-223 package. The LM39101 and LM39102
are fixed and adjustable regulators, respectively, in SOP-8 and TO-252 Packages.
The LM39100/1/2 is ideal for PC add-in cards that need to convert from standard 5V to 3.3V, 3.3V to 2.5V or
2.5V to1.8V. A guaranteed maximum dropout voltage of 630mV overall operating conditions allows the
LM39100/1/2 to provide2.5V from a supply as low as 3.13V and 1.8V from a supply as low as 2.43V. The
LM39100/1/2 is fully protected with over current limiting, thermal shutdown, and reversed-battery protection.
Fixed voltages of 5.0V, 3.3V, 2.5V, 1.8V and 1.5V are available on LM39100/1 with adjustable output voltages
to 1.24V on LM39102.
Absolute Maximum Ratings (Note 1)
CHARACTERISTIC
Supply Voltage
Enable Voltage
Output Voltage
Lead Temperature (Soldering, 5 sec)
Storage Temperature Range
SYMBOL
VIN
VEN
VOUT
TSOL
TSTG
MIN.
- 0.3
-
-0.3
-
-65
MAX.
+ 20
+ 20
VIN +0.3
260
+ 150
UNIT
V
V
V
℃
℃
Nov. 2010 - Rev. 1.5.1
-1-
HTC
1 page  
1A Low-Voltage Low-Dropout Regulator
TYPICAL APPLICATION
LM39100
3.3V
IN OUT
GND
2.5V
3.3V
Enable
Shutdown
LM39100/39101/39102
100k
LM39101
IN OUT
EN FLG
GND
Error Flag
Output
2.5V
2.5V / 1A Regulator
2.5V / 1A Regulator with Error Flag
2.5V
Enable
Shutdown
LM39102
IN OUT
EN ADJ
GND
R1
R2
1.5V
1.5V / 1A Adjustable Regulator
Nov. 2010 - Rev. 1.5.1
-5-
HTC
5 Page 
1A Low-Voltage Low-Dropout Regulator LM39100/39101/39102
Enable Input
The LM39101 and LM39102 versions feature an active-high enable input (EN) that allows on-off control of the
regulator. Current drain reduces to “zero” when the device is shutdown, with only micro amperes of leakage
current. The EN input has TTL/CMOS compatible thresholds for simple logic interfacing. EN may be directly
tied to VIN and pulled up to the maximum supply voltage
Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion
The LM39100/1/2 has excellent transient response to variations 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 10µF 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 or 2.5V to 1.8V, the NPN based regulators are already
operating in dropout, with typical dropout requirements of 1.2V or greater. To convert down to 2.5V or 1.8V
without operating in dropout, NPN-based regulators require an input voltage of 3.7V at the very least. The
LM39100 regulator will provide excellent performance with an input as low as 3.0V or 2.5V respectively. This
gives the PNP based regulators a distinct advantage over older, NPN based linear regulators.
Minimum Load Current
The LM39100/1/2 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.
Adjustable Regulator Design
The LM39102 allows programming the output voltage any-where between 1.24V and the 16V maximum
operating rating of the family. Two resistors are used. Resistors can be quite large, up to 1MΩ, because of the
very high input impedance and low bias current of the sense comparator: The resistor values are calculated
by : R1=R2(Vout/1.240-1) Where Vout 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). The current consumed by feedback resisters R1 and R2 is
calculated by: Ires = Vout / (R1+ R2).
VIN
Enable
Shutdown
LM39102
IN OUT
EN ADJ
GND
VOUT
R1
R2 C OUT
Figure 1. Adjustable Regulator with Resistors
Maximum Output Current Capability
The LM39100/1/2 can deliver a continuous current of 1A over the full operating junction temperature range.
However, the output current is limited by the restriction of power dissipation which differs from packages. A
Nov. 2010 - Rev. 1.5.1
- 11 -
HTC
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LM39102.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM39100 | 1A Low-Voltage Low-Dropout Regulator | HTC |
| LM39101 | 1A Low-Voltage Low-Dropout Regulator | HTC |
| LM39102 | 1A LOW-VOLTAGE LOW-DROPOUT REGULATOR |  Unisonic Technologies |
| LM39102 | 1A Low-Voltage Low-Dropout Regulator | HTC |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |