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PDF MAX859 Data sheet ( Hoja de datos )
| Número de pieza | MAX859 | |
| Descripción | Step-Up DC-DC Converters | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX859 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-0211; Rev 4; 5/96
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
_______________General Description
The MAX856–MAX859 are high-efficiency, CMOS, step-
up, DC-DC switching regulators for small, low input volt -
age or battery-powered systems. The MAX856/MAX858
accept a positive input voltage between 0.8V and V OUT
and convert it to a higher, pin-selectable output voltage of
3.3V or 5V. The MAX857/MAX859 adjustable versions
accept 0.8V to 6.0V input voltages and generate higher
adjustable output voltages in the 2.7V to 6.0V range.
Typical efficiencies are greater than 85%. Typical quies -
cent supply current is 25µA (1µA in shutdown).
The MAX856–MAX859 combine ultra-low quiescent supply
current and high efficiency to give maximum battery life. An
internal MOSFET power transistor permits high switching
frequencies. This benefit, combined with internally set peak
inductor current limits, permits the use of small, low-cost
inductors. The MAX856/MAX857 have a 500mA peak
inductor current limit. The MAX858/MAX859 have a 125mA
peak inductor current limit.
________________________Applications
3.3V to 5V Step-Up Conversion
Palmtop Computers
Portable Data-Collection Equipment
Personal Data Communicators/Computers
Medical Instrumentation
2-Cell & 3-Cell Battery-Operated Equipment
Glucose Meters
__________Typical Operating Circuit
____________________________Features
o 0.8V to 6.0V Input Supply Voltage
o 0.8V Typ Start-Up Supply Voltage
o 85% Efficiency at 100mA
o 25µA Quiescent Current
o 1µA Shutdown Mode
o 125mA and 500mA Switch-Current Limits Permit
Use of Low-Cost Inductors
o Up to 500kHz Switching Frequency
o ±1.5% Reference Tolerance Over Temperature
o Low-Battery Detector (LBI/LBO)
o 8-Pin SO and µMAX Packages
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX856CSA
0°C to +70°C
8 SO
MAX856CUA
0°C to +70°C
8 µMAX
MAX856C/D
0°C to +70°C
Dice*
MAX856ESA
MAX856MJA
-40°C to +85°C
-55°C to +125°C
8 SO
8 CERDIP†
MAX857CSA
0°C to +70°C
8 SO
MAX857CUA
0°C to +70°C
8 µMAX
MAX857C/D
0°C to +70°C
Dice*
MAX857ESA
MAX857MJA
-40°C to +85°C
-55°C to +125°C
8 SO
8 CERDIP†
Ordering Information continued at end of data sheet.
* Dice are tested at TA = +25°C only.
† Contact factory for availability.
INPUT
0.8V TO VOUT
ON/OFF
3V/5V SELECT
LOW-BATTERY
DETECTOR
INPUT
SHDN
LX
MAX856
3/5 OUT
LBI
REF GND
LBO
OUTPUT
47µH 5V AT 100mA
OR
3.3V AT 125mA
1N5817
68µF
LOW-BATTERY
DETECTOR OUTPUT
__________________Pin Configuration
TOP VIEW
SHDN 1
3/5 2
REF 3
LBO 4
MAX856
MAX858
8 LX
7 GND
6 OUT
5 LBI
SO/µMAX
SHDN 1
FB 2
REF 3
LBO 4
MAX857
MAX859
8 LX
7 GND
6 OUT
5 LBI
SO/µMAX
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
http://www.Datasheet4U.com/
1 page  
3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
_____________________________Typical Operating Characteristics (continued)
(Circuits of Figure 2, TA = +25°C, unless otherwise noted.)
MAX856/MAX857
LINE-TRANSIENT RESPONSE (5V MODE)
MAX856/MAX857
LOAD-TRANSIENT RESPONSE (5V MODE)
VOUT
50mV/div
3V
VIN
2V
2ms/div
MAX859 LINE-TRANSIENT RESPONSE
VOUT
50mV/div
ILOAD
0mA to 100mA
VIN = 2.5V
50µs/div
MAX858/MAX859 LOAD-TRANSIENT RESPONSE
VOUT
50mV/div
3V
VIN
2V
1V/div
VOUT
2V/div
1ms/div
MAX856 START-UP DELAY (5V MODE)
VSHDN
5V/div
VOUT
50mV/div
ILOAD
0
0mA to 25mA
25
VIN = 2.5V
2ms/div
MAX858/MAX859 START-UP DELAY (5V MODE)
VOUT
2V/div
VSHDN
5V/div
VIN = 2.5V, ILOAD = 100mA
5ms/div
VIN = 2.5V, ILOAD = 25mA
5ms/div
_______________________________________________________________________________________ 5
http://www.Datasheet4U.com/
5 Page 
3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
Table 2. Surface-Mount Inductor Information
MANUFACTURER PART
INDUCTANCE
(mH)
RESISTANCE
(W)
Sumida CDR105B-470
Sumida CDR74B-470
Sumida CD43-470
Sumida CD43-220
Murata-Erie LQH4N220
Murata-Erie LQH4N470
Murata-Erie LQH1N220
TDK NLC322522T-220K
TDK NLC322522T-470K
Coiltronics CTX20-1
Coilcraft DT1608-223
47
47
47
22
22
47
22
22
47
20
22
0.14
0.27
0.85
0.38
0.94
1.5
3.1
1.15
2.25
0.175
0.16
RATED CURRENT
(A)
1.0
0.8
0.540
0.760
0.320
0.220
0.85
0.210
0.150
1.15
0.500
HEIGHT
(mm)
5.0
4.5
3.2
3.2
2.6
2.6
1.8
2.2
2.2
4.2
3.2
__Ordering Information (continued)
PART
MAX858CSA
MAX858CUA
MAX858C/D
MAX858ESA
MAX858MJA
MAX859CSA
MAX859CUA
MAX859C/D
MAX859ESA
MAX859MJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-55°C to +125°C
* Dice are tested at TA = +25°C only.
† Contact factory for availability.
PIN-PACKAGE
8 SO
8 µMAX
Dice*
8 SO
8 CERDIP†
8 SO
8 µMAX
Dice*
8 SO
8 CERDIP†
___________________Chip Topography
SHDN
3/5 OR FB*
REF
LBO
LX
GND 0.084"
(2.1336mm)
OUT
LBI
0.058"
(1.4732mm)
*3/5 FOR MAX856/MAX858; FB FOR MAX857/MAX859.
TRANSISTOR COUNT: 357;
SUBSTRATE CONNECTED TO OUT.
______________________________________________________________________________________ 11
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX859.PDF ] | |
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