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PDF MAX17067 Data sheet ( Hoja de datos )
| Número de pieza | MAX17067 | |
| Descripción | Low-Noise Step-Up DC-DC Converter | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3106; Rev 0; 1/08
www.DataSheet4EUV.cAAoLVmUAAILTAIOBNLEKIT
Low-Noise Step-Up DC-DC Converter
General Description
The MAX17067 boost converter incorporates high-
performance (at 1.2MHz), current-mode, fixed-frequency,
pulse-width modulation (PWM) circuitry with a built-in
0.15Ω n-channel MOSFET to provide a highly efficient
regulator with fast response.
High switching frequency (640kHz or 1.2MHz selectable)
allows for easy filtering and faster loop performance. An
external compensation pin provides the user flexibility in
determining loop dynamics, allowing the use of small,
low equivalent-series-resistance (ESR) ceramic output
capacitors. The device can produce an output voltage
as high as 18V.
Soft-start is programmed with an external capacitor, which
sets the input-current ramp rate. The MAX17067 is avail-
able in a space-saving 8-pin μMAX® package. The ultra-
small package and high switching frequency allow the
total solution to be less than 1.1mm high.
Features
o 90% Efficiency
o Adjustable Output from VIN to 18V
o 2.4A, 0.15Ω, 22V Power MOSFET
o +2.6V to +4.0V Input Range
o Pin-Selectable 640kHz or 1.2MHz Switching
Frequency
o Programmable Soft-Start
o Small 8-Pin µMAX Package
o Integrated Input Voltage Clamp Circuit
LCD Displays
Application
Typical Operating Circuit
VIN
2.6V TO 4V
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
MAX17067EUA+ -40°C to +85°C 8 μMAX
+ Denotes a lead-free package.
PKG
CODE
U8+1
Pin Configuration
ON/OFF
IN
SHDN
LX
MAX17067
FREQ GND
SS FB
COMP
TOP VIEW
VOUT
COMP 1
8 SS
FB 2
SHDN 3
MAX17067
7 FREQ
6 IN
GND 4
5 LX
μMAX
μMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Low-Noise Step-Up DC-DC Converter
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 3.3V, fOSC = 640kHz, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
4.0
SOFT-START
(RLOAD = 18Ω)
MAX17067 toc05
3.5
VOUT
5V/div
3.0
2.5 SWITCHING
2.0
0V
1.5
1.0
NONSWITCHING
0.5
INDUCTOR
CURRENT
1A/div
0A
0
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9
SUPPLY VOLTAGE (V)
2ms/div
LOAD-TRANSIENT RESPONSE
(ILOAD = 10mA TO 200mA)
MAX17067 toc06
IOUT
200mA/div
10mA
VOUT
500mA/div
AC-COUPLED
0V
PULSED LOAD-TRANSIENT RESPONSE
(ILOAD = 40mA TO 1.1A)
MAX17067 toc07
IOUT
1A/div
0.1A
9V
VOUT
200mV/div
AC-COUPLED
0V
L = 3.3μH
RCOMP = 39kΩ
CCOMP1 = 620pF
100μs/div
INDUCTOR
CURRENT
500mA/div
0A
L = 3.3μH
RCOMP = 39kΩ
CCOMP1 = 620pF
10μs/div
SWITCHING WAVEFORMS
(ILOAD = 500mA)
MAX17067 toc08
INDUCTOR
CURRENT
1A/div
0A
LX
5V/div
0V
INDUCTOR
CURRENT
1A/div
0A
1μs/div
_______________________________________________________________________________________ 5
5 Page 
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Low-Noise Step-Up DC-DC Converter
Application Circuits
1-Cell to 3.3V SEPIC Power Supply
Figure 3 shows the MAX17067 in a single-ended primary
inductance converter (SEPIC) topology. This topology is
useful when the input voltage can be either higher or
lower than the output voltage, such as when converting
a single lithium-ion (Li+) cell to a 3.3V output. L1A and
L1B are two windings on a single inductor. The coupling
capacitor between these two windings must be a low-
ESR type to achieve maximum efficiency, and must also
be able to handle high ripple currents. Ceramic capaci-
tors are best for this application. The circuit in Figure 3
provides 400mA output current at 3.3V output when
operating with an input voltage from +2.6V to +4.0V.
AMLCD Application
Figure 4 shows a power supply for active matrix (TFT-
LCD) flat-panel displays. Output-voltage transient per-
formance is a function of the load characteristic. Add or
remove output capacitance (and recalculate compen-
sation-network component values) as necessary to
meet transient performance. Regulation performance
for secondary outputs (VGOFF and VGON) depends on
the load characteristics of all three outputs.
VIN
2.6V TO 4.0V
IN
SHDN
L1A
5.3μH
LX
C2
10μF
D1
C1
10μF
10V
VOUT
3.3V
MAX17067
FREQ
GND
L1B
5.3μH
COUT
22μF
20V
0.027μF
CCOMP2
SS
FB
CC
RCOMP
R2
605kΩ
R1
1MΩ
CCOMP
L1 = CTX8-1P
COUT = TPSD226025R0200
Figure 3. MAX17067 in a SEPIC Configuration
VGOFF
-9V
C14
4.7μF
VIN
2.6V TO 4.0V
C1
10μF
10V R3 C4
10Ω 1μF
1 D4
3
2
C9
0.1μF
L1
3.3μH
C11
0.1μF
D2
3
2
C10
0.1μF
D3
3
1
2
1
D1
R6
100kΩ
C15
27nF
6 IN
5
LX
U1
MAX17067
3 SHDN
7 FREQ
8 SS
GND 4
FB 2
COMP
1
R5
121kΩ
C5
620pF
C6
OPEN
C7
10μF
25V
R1
274kΩ
R2
44.2kΩ
C12
1μF
VGON
+27V
C13
1μF
VOUT
+9V/250mA
Figure 4. Multiple-Output, Low-Profile (1.2mm max) TFT-LCD Power Supply
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX17067.PDF ] | |
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