|
|
PDF MAX1675 Data sheet ( Hoja de datos )
| Número de pieza | MAX1675 | |
| Descripción | Step-Up DC-DC Converters | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX1675 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
AVAILABLE
EVALUATION KIT AVAILABLE
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
General Description
The MAX1674/MAX1675/MAX1676 compact, high-effi-
ciency, step-up DC-DC converters fit in small µMAX
packages. They feature a built-in synchronous rectifier,
which improves efficiency and reduces size and cost
by eliminating the need for an external Schottky diode.
Quiescent supply current is only 16µA.
The input voltage ranges from 0.7V to VOUT, where
VOUT can be set from 2V to 5.5V. Start-up is guaran-
teed from 1.1V inputs. The MAX1674/MAX1675/
MAX1676 have a preset, pin-selectable output for 5V or
3.3V. The outputs can also be adjusted to other volt-
ages using two external resistors.
All three devices have a 0.3Ω N-channel MOSFET
power switch. The MAX1674 has a 1A current limit. The
MAX1675 has a 0.5A current limit, which permits the
use of a smaller inductor. The MAX1676 comes in a
10-pin µMAX package and features an adjustable cur-
rent limit and circuitry to reduce inductor ringing.
________________________Applications
Pagers
Wireless Phones
Medical Devices
Hand-Held Computers
PDAs
RF Tags
1 to 3-Cell Hand-Held Devices
Functional Diagrams
Typical Operating Circuit
INPUT
0.7V TO VOUT
ON
OFF
SHDN
LX
MAX1674 OUT
MAX1675
OUTPUT
3.3V, 5V, OR
ADJ (2V TO 5.5V)
UP TO 300mA
LOW-BATTERY
DETECT IN
LBI LBO
REF FB GND
LOW-BATTERY
DETECT OUT
Pin Configuration0s.1µaFppear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
____________________________Features
o 94% Efficient at 200mA Output Current
o 16µA Quiescent Supply Current
o Internal Synchronous Rectifier (no external diode)
o 0.1µA Logic-Controlled Shutdown
o LBI/LBO Low-Battery Detector
o Selectable Current Limit for Reduced Ripple
o Low-Noise, Anti-Ringing Feature (MAX1676)
o 8-Pin and 10-Pin µMAX Packages
o Preassembled Evaluation Kit (MAX1676EVKIT)
_______________Ordering Information
PART
MAX1674EUA
MAX1675EUA
MAX1676EUB
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
10 µMAX
TOP VIEW
Pin Configurations
FB 1
LBI 2
LBO 3
REF 4
MAX1674
MAX1675
8 OUT
7 LX
6 GND
5 SHDN
µMAX
FB 1
LBI 2
LBO 3
CLSEL 4
REF 5
MAX1676
µMAX
10 OUT
9 LX
8 GND
7 BATT
6 SHDN
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1360; Rev 3; 3/00
1 page  
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
Typical Operating Characteristics (continued)
(L = 22µH, CIN = 47µF, COUT = 47µF 0.1µF, CREF = 0.1µF, TA = +25°C, unless otherwise noted.)
NO-LOAD BATTERY CURRENT
vs. INPUT BATTERY VOLTAGE
160
140
120 ILIMIT = 1A, 5.0V
100
80
ILIMIT = 0.5A, 5.0V
60
40 ILIMIT = 0.5A, 3.3V
20
0
0
ILIMIT = 1A, 3.3V
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
INPUT BATTERY VOLTAGE (V)
SHUTDOWN THRESHOLD
vs. SUPPLY VOLTAGE
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
START-UP VOLTAGE
vs. LOAD CURRENT
1.8
1.6
1.4
1.2 WITHOUT DIODE
1.0
0.8
0.6 WITH 1N5817
0.4
0.2
0
0.01
0.1 1 10
LOAD CURRENT (mA)
100
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE (VOUT = 5V)
900
800
700
1A CURRENT LIMIT
600
500
400
300
200
0.5A CURRENT LIMIT
100
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1674 TOC13
VLX
5V/div
ILX
0.5A/div
VIN = 2.4V
VOUT = 5.0V
1µs/div
VOUT
AC COUPLED
100mV/div
SWITCH RESISTANCE vs. TEMPERATURE
0.45
0.40 P-CHANNEL
0.35
0.30
0.25 N-CHANNEL
0.20
0.15
0.10
0.05
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
1 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE (VOUT = 3.3V)
800
700
600
1A CURRENT LIMIT
500
400
300
200
0.5A CURRENT LIMIT
100
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
INPUT VOLTAGE (V)
LX CURRENT LIMIT
vs. OUTPUT VOLTAGE
1.2
MAX1674, MAX1676 (CLSEL = OUT)
1.0
0.8
0.6
0.4 MAX1675, MAX1676 (CLSEL = GND)
0.2
0
2.0
2.5 3.0 3.5 4.0 4.5
OUTPUT VOLTAGE (V)
5.0
Maxim Integrated
5
5 Page 
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
Table 1. Suggested Components
PRODUCTION
METHOD
Surface Mount
Miniature Through-Hole
INDUCTORS
Sumida CD43 series
Sumida CD54 series
Coilcraft DT1608C
Coilcraft DO1608C
Coiltronics Uni-PAC
Murata LQH4 series
Sumida RCH654-220
CAPACITORS
Sprague 593D series
Sprague 595D series
AVX TPS series
ceramic
Sanyo OS-CON series
RECTIFIERS
(OPTIONAL)
Motorola MBR0530
Nihon EC 15QS02L
—
Table 2. Surface-Mount Inductor
Specifications
MANUFACTURER
PART NUMBER
µH
Ω (max)
IPEAK (A)
HEIGHT
(mm)
Coilcraft DT1608C-103 10
Coilcraft DO1608C-153 15
0.095
0.200
0.7
0.9
2.92
2.92
Coilcraft DO1608C-223
Coiltronics UP1B-100
Coiltronics UP1B-150
Coiltronics UP1B-220
Murata LQH4N100
22
10
15
22
10
0.320
0.111
0.175
0.254
0.560
0.7
1.9
1.5
1.2
0.4
2.92
5.0
5.0
5.0
2.6
Murata LQH4N220
Sumida CD43-8R2
Sumida CD43-100
Sumida CD54-100
Sumida CD54-180
Sumida CD54-220
22 0.560
8.2 0.132
10 0.182
10 0.100
18 0.150
22 0.180
0.4
1.26
1.15
1.44
1.23
1.11
2.6
3.2
3.2
4.5
4.5
4.5
Table 3. Component Suppliers
COMPANY
AVX
Coilcraft
Coiltronics
Motorola
PHONE
USA (803) 946-0690
USA (847) 639-6400
USA (561) 241-7876
USA (303) 675-2140
(800) 521-6274
FAX
USA (803) 626-3123
USA (847) 639-1469
USA (561) 241-9339
USA (303) 675-2150
Murata
USA (814) 237-1431
(800) 831-9172
USA (814) 238-0490
Nihon
USA (805) 867-2555 USA (805) 867-2556
Japan 81-3-3494-7411 Japan 81-3-3494-7414
Sanyo
USA (619) 661-6835 USA (619) 661-1055
Japan 81-7-2070-6306 Japan 81-7-2070-1174
Sprague
USA (603) 224-1961 USA (603) 224-1430
Sumida
USA (647) 956-0666 USA (647) 956-0702
Japan 81-3-3607-5111 Japan 81-3-3607-5144
Taiyo Yuden USA (408) 573-4150 USA (408) 573-4159
Capacitor Selection
A 47µF, 10V surface-mount tantalum (SMT) output filter
capacitor provides 80mV output ripple when stepping
up from 2V to 5V. Smaller capacitors (down to 10µF
with higher ESRs) are acceptable for light loads or in
applications that can tolerate higher output ripple.
Values in the 10µF to 100µF range are recommended.
The equivalent series resistance (ESR) of both bypass
and filter capacitors affects efficiency and output rip-
ple. Output voltage ripple is the product of the peak
inductor current and the output capacitor ESR. Use
low-ESR capacitors for best performance, or connect
two or more filter capacitors in parallel. Low-ESR, SMT
tantalum capacitors are currently available from
Sprague (595D series) AVX (TPS series) and other
sources. Ceramic surface-mount and Sanyo OS-CON
organic-semiconductor through-hole capacitors also
exhibit very low ESR, and are especially useful for oper-
ation at cold temperatures. See Table 3 for a list of sug-
gested component suppliers.
Maxim Integrated
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1675.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX167 | (MAX163 - MAX167) CMOS 12-Bit A/D Converters |  Maxim Integrated Products |
| MAX1672 | Step-Up/Down DC-DC Converter in QSOP Package | Maxim Integrated |
| MAX1672EEE | Step-Up/Down DC-DC Converter in QSOP Package | Maxim Integrated |
| MAX1673 | Regulated / 125mA-Output / Charge-Pump DC-DC Inverter | Maxim Integrated |
| 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 |