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PDF MAX608 Data sheet ( Hoja de datos )
| Número de pieza | MAX608 | |
| Descripción | 5V or Adjustable / Low-Voltage / Step-Up DC-DC Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX608 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-0438; Rev 0; 9/95
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
_______________General Description
The MAX608 low-voltage step-up controller operates
from a 1.8V to 16.5V input voltage range. Pulse-fre-
quency-modulation (PFM) control provides high effi-
ciency at heavy loads, while using only 85µA (typical)
when operating with no load. In addition, a logic-con-
trolled shutdown mode reduces supply current to 2µA
typical. The output voltage is factory-set at 5V or can be
adjusted from 3V to 16.5V with an external resistor
divider.
The MAX608 is ideal for two- and three-cell battery-
powered systems. An operating frequency of up to
300kHz allows use with small surface-mount compo-
nents.
The MAX608 operates in “bootstrapped” mode only
(with the chip supply, OUT, connected to the DC-DC
output). For a 12V output without external resistors, or
for nonbootstrapped applications (chip supply connect-
ed to input voltage), refer to the pin-compatible
MAX1771. The MAX608 is available in 8-pin DIP and
SO packages.
____________________________Features
o 1.8V to 16.5V Input Range
o 85% Efficiency for 30mA to 1.5A Load Currents
o Up to 10W Output Power
o 110µA Max Supply Current
o 5µA Max Shutdown Current
o Preset 5V or Adjustable Output (3V to 16.5V)
o Current-Limited PFM Control Scheme
o Up to 300kHz Switching Frequency
o Evaluation Kit Available
________________________Applications
High-Efficiency DC-DC Converters
Battery-Powered Applications
Positive LCD-Bias Generators
Portable Communicators
______________Ordering Information
PART
TEMP. RANGE
MAX608C/D
0°C to +70°C
MAX608EPA
-40°C to +85°C
MAX608ESA
-40°C to +85°C
* Contact factory for dice specifications.
PIN-PACKAGE
Dice*
8 Plastic DIP
8 SO
__________Typical Operating Circuit __________________Pin Configuration
INPUT
1.8V TO VOUT
ON/OFF
MAX608
SHDN
EXT
REF CS
FB AGND GND OUT
N
OUTPUT
5V
TOP VIEW
EXT 1
OUT 2
FB 3
SHDN 4
MAX608
DIP/SO
8 CS
7 GND
6 AGND
5 REF
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
1 page  
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
HEAVY-LOAD SWITCHING WAVEFORMS
(VOUT = 12V)
MEDIUM-LOAD SWITCHING WAVEFORMS
(VOUT = 12V)
VOUT
VOUT
A 0V A 0V
ILIM ILIM
BB
0A 0A
CC
2µs/div
VIN = 4V, IOUT = 490mA, VOUT = 12V
A = EXT VOLTAGE, 10V/div
B = INDUCTOR CURRENT, 1A/div
C = VOUT RIPPLE, 50mV/div, AC-COUPLED
LINE-TRANSIENT RESPONSE
(VOUT = 5V)
10µs/div
VIN = 4V, IOUT = 300mA, VOUT = 12V
A = EXT VOLTAGE, 10V/div
B = INDUCTOR CURRENT, 1A/div
C = VOUT RIPPLE, 50mV/div, AC-COUPLED
LOAD-TRANSIENT RESPONSE
(VOUT = 5V)
A 4.0V
500mA
A
2.7V 0A
B
5ms/div
IOUT = 500mA, VOUT = 5V
A = VIN, 2.7V TO 4.0V, 1V/div
B = VOUT RIPPLE, 100mV/div, AC-COUPLED
B
EXITING SHUTDOWN
2ms/div
VIN = 2V, VOUT = 5V
A = LOAD CURRENT, 0mA TO 500mA, 500mA/div
B = VOUT RIPPLE, 50mV/div, AC-COUPLED
A
0V
5V
B
0V
200µs/div
IOUT = 500mA, VIN = 3.5V
A = SHDN, 2V/div
B = VOUT, 2V/div
_______________________________________________________________________________________ 5
5 Page 
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
PRODUCTION
Surface Mount
INDUCTORS
Sumida
CD54 series
CDR125 series
Coiltronics
CTX20 series
Coilcraft
DO3316 series
DO3340 series
CAPACITORS
Matsuo
267 series
Sprague
595D series
AVX
TPS series
Sanyo
OS-CON series
TRANSISTORS
Siliconix
Si9410DY
Si4410DY
Si6426DQ
Si6946DQ
Motorola
MTP3055EL
MTD20N03HDL
MMFT3055ELT1
DIODES
Central Semiconductor
CMPSH-3
CMPZ5240
Nihon
EC11 FS1 series (high-
speed silicon)
Motorola
MBRS1100T3
MMBZ5240BL
Through Hole
Sumida
RCH855 series
RCH110 series
Sanyo
OS-CON series
Nichicon
PL series
Motorola
1N5817–1N5822
MUR105 (high-speed
silicon)
Feed-Forward Capacitor
When adjusting the output voltage, it may be necessary
to parallel a 47pF to 220pF capacitor across R2, as
shown in Figures 2 and 3. Choose the lowest capacitor
value that insures stability; high capacitance values
may degrade line regulation.
__________Applications Information
Starting Up Under Load
The Typical Operating Characteristics show the Start-Up
Voltage vs. Load Current graphs for 5V and 12V output
voltages. These graphs depend on the type of power
switch used. The MAX608 is not designed to start up
under full load with low input voltages.
Layout Considerations
Due to high current levels and fast switching wave-
forms, which radiate noise, proper PC board layout is
essential. Protect sensitive analog grounds by using a
star ground configuration. Minimize ground noise by
connecting GND, the input bypass capacitor ground
lead, and the output filter capacitor ground lead to a
single point (star ground configuration). Also, minimize
lead lengths to reduce stray capacitance, trace resis-
tance, and radiated noise. Place input bypass capaci-
tor C2 as close as possible to OUT and GND.
If an external resistor divider is used (Figures 2 and
3), the trace from FB to the resistors must be
extremely short.
SUPPLIER
PHONE
FAX
AVX USA: (803) 448-9411 (803) 448-1943
Central
Semiconductor
USA: (516) 435-1110
(516) 435-1824
Coilcraft
USA: (708) 639-6400 (708) 639-1469
Coiltronics
USA: (407) 241-7876 (407) 241-9339
Matsuo
USA: (714) 969-2491 (714) 960-6492
Japan: 81-6-337-6450 81-6-337-6456
Motorola
USA: (800) 521-6274 (602) 952-4190
Nichicon
USA: (708) 843-7500 (708) 843-2798
Nihon
USA: (805) 867-2555 (805) 867-2556
Sanyo
USA: (619) 661-6835 (619) 661-1055
Japan: 81-7-2070-1005 81-7-2070-1174
Siliconix
USA: (800) 554-5565 (408) 970-3950
Sprague
USA: (603) 224-1961 (603) 224-1430
Sumida
USA: (708) 956-0666 (708) 956-0702
Japan: 81-3-3607-5111 81-3-3607-5144
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX608.PDF ] | |
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