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PDF MAX866 Data sheet ( Hoja de datos )
| Número de pieza | MAX866 | |
| Descripción | 3.3V/5V or Adjustable-Output / Single-Cell DC-DC Converters | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX866 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-0374; Rev 1; 5/96
EVAALVUAAILTAIOBNLEKIT
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
_______________General Description
The MAX866 and MAX867 are ultra-small, high-efficiency,
CMOS, step-up, DC-DC switching regulators for 1-cell
battery-powered systems. The MAX866 accepts a posi-
tive input voltage between 0.8V and VOUT and converts it
to a higher, pin-selectable output voltage of 3.3V or 5V.
The MAX867 adjustable version accepts 0.8V to 6.0V
input voltages and generates a higher adjustable output
voltage in the 2.7V to 6.0V range. Typical efficiencies are
greater than 80%. Typical no-load supply current is
100µA (1µA in shutdown).
The MAX866/MAX867 combine ultra-low quiescent sup-
ply current and high efficiency to give maximum battery
life. Its high switching frequency permits the use of
small, low-cost inductors and capacitors. Additionally,
internal peak-current limiting protects the IC.
________________________Applications
Pagers
Remote Controls
Detectors
1-Cell Battery-Operated Equipment
Backup Supplies
__________Typical Operating Circuit
____________________________Features
o 0.8V to 6.0V Input Supply Voltage
o 0.9V Guaranteed Start-Up Supply Voltage
o >80% Efficiency Over Wide Load Range
o 100µA No-Load Battery Current (VOUT = 3.3V)
o 1µA Shutdown Mode
o Up to 250kHz Switching Frequency
o ±1.5% Reference Tolerance
o Low-Battery Detector (LBI/LBO)
o Available in Ultra-Small 8-Pin µMAX Package
(1.11mm high)
o Circuit Fits in 0.2in2
______________Ordering Information
PART
MAX866C/D
TEMP. RANGE
0°C to +70°C
MAX866ESA
-40°C to +85°C
MAX866EUA
MAX867C/D
MAX867ESA
MAX867EUA
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
* Dice are tested at TA = +25°C only.
PIN-PACKAGE
Dice*
8 SO
8 µMAX
Dice*
8 SO
8 µMAX
_________________Pin Configurations
INPUT
0.8V TO VOUT
ON/OFF
3V/5V SELECT
LOW-BATTERY
DETECTOR
INPUT
0.22µF
330µH
SHDN
MAX866
3/5
LX
MBRS0520LTI
OR 1N5817
OUT
OUTPUT
5V OR 3.3V
47µF
LBI
REF GND
LBO
LOW-BATTERY
DETECTOR OUTPUT
TOP VIEW
SHDN 1
3/5 2
REF 3
LBO 4
MAX866
8 LX
7 GND
6 OUT
5 LBI
SO/µMAX
SHDN 1
FB 2
REF 3
LBO 4
MAX867
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
1 page  
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
____________________________Typical Operating Characteristics (continued)
(Circuits of Figure 2, TA = +25°C, unless otherwise noted.)
MAX866 LOAD-TRANSIENT RESPONSE
(3.3V MODE)
MAX866 LOAD-TRANSIENT RESPONSE
(5V MODE)
AA
B
1ms/div
A: 3.3V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: OUTPUT CURRENT (0mA AND 10mA) 5mV/div
(TEKTRONIX P6042 CURRENT PROBE)
ILOAD = 5mA, COUT = 47µF, VIN = 1.25V
MAX866 SHUTDOWN RESPONSE
(3.3V MODE)
B
1ms/div
A: 5.0V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: OUTPUT CURRENT (0mA AND 10mA) 5mV/div
(TEKTRONIX P6042 CURRENT PROBE)
ILOAD = 5mA, COUT = 47µF, VIN = 1.25V
MAX866 SHUTDOWN RESPONSE
(5V MODE)
A
A
BB
1.260
1.250
10ms/div
A: 3.3V OUTPUT VOLTAGE, 2V/div
B: SHDN INPUT VOLTAGE (0V AND 5V) 2V/div
ILOAD = 10mA
MAX867 LBI AND FB THRESHOLD
vs. TEMPERATURE
0.5
10ms/div
A: 5.0V OUTPUT VOLTAGE, 2V/div
B: SHDN INPUT VOLTAGE (0V AND 5V) 5V/div
ILOAD = 10mA
MAX866 OUTPUT VOLTAGE ERROR
vs. TEMPERATURE
START-UP VOLTAGE
vs. TEMPERATURE
1.0
3.3V MODE
ILOAD = 0A
0.9
LBI
0.8
0
5V MODE
0.7
VFB (MAX867)
1.240
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
ILOAD= OA
-0.5
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
0.6
0.5
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
Table 2. Surface-Mount Inductor Information
MANUFACTURER /PART
INDUCTANCE
(mH)
RESISTANCE
(W)
RATED CURRENT
(A)
HEIGHT
(mm)
Sumida CD73-331
330
Sumida CD104-331
330
Murata-Erie LQH4N331K04M00**
330
TDK NLC565050T-331K**
330
Coilcraft D01608-334
330
Coilcraft DT1608-334
330*
Coilcraft D03316-334
330
Coilcraft DT3316-334
330*
J.W. Miller PM105-331K
330
* Shielded
** Low cost
tolerate higher output ripple. Values in the 10µF to 47µF
range are recommended.
The equivalent series resistance (ESR) of both bypass
and filter capacitors affects efficiency and output ripple.
Use low-ESR capacitors for best performance, or con-
nect two or more filter capacitors in parallel. Low-ESR,
SMT tantalum capacitors are currently available from
Sprague (595D series) and AVX (TPS series). See
Table 1 for a list of suggested capacitor suppliers.
Rectifier Diode
For optimum performance, a switching Schottky diode
(such as the 1N5817 or MBR0520LTI) is recommended.
Refer to Table 1 for a list of component suppliers. For
low output power applications, a PN-junction switching
diode (such as the 1N4148) will also work well,
although its greater forward voltage drop will reduce
efficiency and raise the start-up voltage.
PC Layout and Grounding
The circuit’s high-frequency operation makes PC layout
important for minimizing ground bounce and noise.
Keep the IC’s GND pin and the ground leads of C1 and
C2 (Figure 2) less than 0.2in (5mm) apart. Also keep all
connections to the FB and LX pins as short as possible.
To maximize output power and efficiency and minimize
output ripple voltage, use a ground plane and solder
the IC’s GND (pin 7) directly to the ground plane.
1.5
0.28
3.5
1.1
0.42
4
8.2
0.095
2.6
4.9
0.14
5
2.9
0.16
3.2
2.9
0.16
3.2
0.7 0.6 5.4
0.7 0.6 5.4
1.1
0.52
5.4
___________________Chip Topography
SHDN
LX
3/5
OR FB*
REF
GND 0.084"
(2.1336mm)
OUT
LBO LBI
0.058"
(1.4732mm)
*3/5 FOR MAX866; FB FOR MAX867.
TRANSISTOR COUNT: 357;
SUBSTRATE IS CONNECTED TO OUT.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX866.PDF ] | |
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