|
|
PDF LTC3025-4 Data sheet ( Hoja de datos )
| Número de pieza | LTC3025-4 | |
| Descripción | 500mA Micropower VLDO Linear Regulators | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC3025-4 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
FEATURES
n Wide Input Voltage Range: 0.9V to 5.5V
n Stable with Ceramic Capacitors
n Very Low Dropout: 85mV at 500mA
n Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)
n Fixed Output: 1.2V(LTC3025-2), 1.5V(LTC3025-3),
1.8V(LTC3025-4)
n ±2% Voltage Accuracy over Temperature,
Supply and Load
n Low Noise: 80μVRMS (10Hz to 100kHz)
n BIAS Voltage Range: 2.5V to 5.5V
n Fast Transient Recovery
n Shutdown Disconnects Load from VIN and VBIAS
n Low Operating Current: IIN = 4μA, IBIAS = 50μA Typ
n Low Shutdown Current: IIN = 1μA, IBIAS = 0.01μA Typ
n Output Current Limit
n Thermal Overload Protection
n Available in 6-Lead (2mm × 2mm) DFN Package
APPLICATIONS
n Low Power Handheld Devices
n Low Voltage Logic Supplies
n DSP Power Supplies
n Cellular Phones
n Portable Electronic Equipment
n Handheld Medical Instruments
n Post Regulator for Switching Supply Noise Rejection
LTC3025-1/LTC3025-2/
LTC3025-3w/wLwT.DCataS3he0et42U.c5om-4
500mA Micropower
VLDO Linear Regulators
DESCRIPTION
The LTC®3025-X is a micropower, VLDO™ (very low drop-
out) linear regulator which operates from input voltages as
low as 0.9V. The device is capable of supplying 500mA of
output current with a typical dropout voltage of only 85mV.
A BIAS supply is required to run the internal reference and
LDO circuitry while output current comes directly from the
IN supply for high efficiency regulation. The LTC3025-1
features an adjustable output with a low 0.4V reference
while the LTC3025-2, LTC3025-3, and LTC3025-4 have
fixed 1.2V, 1.5V and 1.8V output voltages respectively.
The LTC3025-X’s low quiescent current makes it an ideal
choice for use in battery-powered systems. For 3-cell NiMH
and single cell Li-Ion applications, the BIAS voltage can
be supplied directly from the battery while the input can
come from a high efficiency buck regulator, providing a
high efficiency, low noise output.
Other features include high output voltage accuracy,
excellent transient response, stability with ultralow ESR
ceramic capacitors as small as 1μF, short-circuit and
thermal overload protection and output current limiting.
The LTC3025-X is available in a tiny, low profile (0.75mm)
6-lead DFN (2mm × 2mm) package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
VLDO is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 7224204, 7218082.
TYPICAL APPLICATION
1.2V Output Voltage from 1.5V Input Supply
Li-Ion
OR
3-CELL
NiMH
1.5V HIGH
EFFICIENCY 1.5V
DC/DC
BUCK
0.1μF
0.1μF
OFF ON
BIAS
OUT
LTC3025-2
IN SENSE
SHDN
GND
VOUT = 1.2V
1μF IOUT ≤ 500mA
30251234 TA01
1MHz VIN Supply Rejection
50
45 COUT = 10μF
40
35 COUT = 1μF
30
25
20
15
10
5 BIAS = 3.6V
VOUT = 1.2V
0
1.2 1.4 1.6
1.8 2.0
VIN (V)
IOUT = 100mA
IOUT = 300mA
2.2 2.4 2.6
30251234 TA01b
30251234fc
1
1 page  
LTC3025-1/LTC3025-2/
LTC3025-3w/wLwT.DCataS3he0et42U.c5om-4
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted)
VIN No Load Operating Current
14 VBIAS = 5V
12 VOUT = 0.8V
10
125°C
8
85°C
6 25°C
–40°C
4
2
0
0.5 1.5 2.5 3.5 4.5 5.5
VIN (V)
30251234 G04
SHDN Threshold vs Temperature
1000
900
800
700 VBIAS = 5V
600
500 VBIAS = 2.5V
400
300
200
100
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
30251234 G07
VIN Ripple Rejection
vs Frequency
70
60
COUT = 10μF
50
40
COUT = 1μF
30
20
VBIAS = 3.6V
10
VIN = 1.5V
VOUT = 1.2V
IOUT = 100mA
0
100 1k 10k
100k
FREQUENCY (Hz)
1M 10M
30251234 G10
VIN Shutdown Current
7
VBIAS = 5V
6
5
–40°C
4
3
2
85°C
1
25°C
0
0.5 1.5 2.5 3.5 4.5 5.5
VIN (V)
30251234 G05
Adjust Voltage vs Temperature
405
404
VBIAS = 3.6V
VIN = 1.5V
403 IOUT = 10μA
402
401
400
399
398
397
396
395
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
30251234 G06
Current Limit vs VIN Voltage
1600
Burst Mode DC/DC Buck Ripple
Rejection
1400
1200
1000
VIN
AC
100mV/DIV
800 VOUT
600
AC
10mV/DIV
400
200
0
0123456
VIN (V)
30251234 G08
VIN = 1.8V
VOUT = 1.5V
COUT = 1μF
IOUT = 50mA
10μs/DIV
30251234 G09
BIAS Ripple Rejection
vs Frequency
70
60
COUT = 10μF
50
40
30
20
VBIAS = 3.6V
10
VIN = 1.5V
VOUT = 1.2V
IOUT = 100mA
0
100 1k 10k
COUT = 1μF
100k 1M
FREQUENCY (Hz)
10M
30251234 G11
3MHz VIN Supply Rejection
50
45
40 COUT = 10μF
35 COUT = 1μF
30
25
20
15
10
5 VBIAS = 3.6V
VOUT = 1.2V
0
1.2 1.4 1.6
1.8 2.0
VIN (V)
IOUT = 100mA
IOUT = 300mA
2.2 2.4 2.6
30251234 G12
30251234fc
5
5 Page 
LTC3025-1/LTC3025-2/
LTC3025-3w/wLwT.DCataS3he0et42U.c5om-4
PACKAGE DESCRIPTION
DC Package
6-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1703)
0.675 ±0.05
R = 0.115
TYP
0.56 ± 0.05
(2 SIDES)
4
0.38 ± 0.05
6
2.50 ±0.05
1.15
±0.05
0.61 ±0.05
(2 SIDES)
PACKAGE PIN 1 BAR
OUTLINE TOP MARK
(SEE NOTE 6)
0.25 ± 0.05
0.50 BSC
1.42 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.200 REF
2.00 ±0.10
(4 SIDES)
0.75 ±0.05
0.00 – 0.05
PIN 1
CHAMFER OF
EXPOSED PAD
31
(DC6) DFN 1103
0.25 ± 0.05
0.50 BSC
1.37 ±0.05
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
30251234fc
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3025-4.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC3025-1 | 500mA Micropower VLDO Linear Regulators | Linear Technology |
| LTC3025-2 | 500mA Micropower VLDO Linear Regulators | Linear Technology |
| LTC3025-3 | 500mA Micropower VLDO Linear Regulators | Linear Technology |
| LTC3025-4 | 500mA Micropower VLDO Linear Regulators | Linear Technology |
| 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 |