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PDF ISL97702 Data sheet ( Hoja de datos )
| Número de pieza | ISL97702 | |
| Descripción | Boost | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
October 13, 2005
ISL97702
FN7462.0
Boost with Dual Reference Outputs
The ISL97702 represents a high efficiency, boost converter
with integrated boost FET, boost diode and input disconnect
FET. A dual feedback circuit allows simple switching
between two pre-defined output vbltages using a single logic
input..
With an input voltage of 2.3V to 5.5V the ISL97702 has an
output capability of up to 50mA at 18V using integrated
500mA switches. Efficiencies are up to 87%. The
integrated protection FET is used to disconnect the boost
inductor from the input supply whenever an output fault
condition is detected, or when the device is disabled. This
gives 0 output current in the disabled mode, compared to
standard boost converters where current can still flow when
the device is disabled.
The ISL97702 comes in the 10 Ld 3x3 DFN package and is
specified for operation over the -40°C to 85°C temperature
range.
Ordering Information
PART
NUMBER
PART TAPE &
MARKING REEL PACKAGE
PKG.
DWG. #
ISL97702IRZ
(Note)
97702IRZ
- 10 Ld 3x3 DFN MDP0047
(Pb-Free)
ISL97702IRZ-T7 97702IRZ
(Note)
7” 10 Ld 3x3 DFN MDP0047
(Pb-Free)
ISL97702IRZ-T13 97702IRZ 13” 10 Ld 3x3 DFN MDP0047
(Note)
(Pb-Free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Pinout
ISL97702
(10 LD 3X3 DFN)
TOP VIEW
GND 1
VDDOUT 2
VDD 3
NSYNC 4
FB0 5
THERMAL
PAD
10 LX
9 VOUT
8 NEN
7 SEL
6 FB1
Features
• Up to 87% efficiency
• 2.3V to 5.5V input
• Up to 28V output
• 50mA at 18V
• Integrated boost Schottky diode
• Input voltage disconnect switch
• Dual output voltage selectable
• Synchronization input
• Chip enable
• 10 Ld 3x3 DFN package
• Pb-free plus anneal available (RoHS compliant)
Applications
• OLED display power
• LED display power
• Adjustable power supplies
Typical Application Diagram
2.3V-5.5V
C0
5µ
VDDOUT
VDD
NEN
NSYNC
GND
L1
6.8µ
SEL
LX
VOUT
VDD+2V - 30V
C1
3.3µ
R1
390K
FB0 R3
26.1K
FB1
R2
39K
BOOST WITH
DUAL REFERENCE
V(VOUT)0 = (390K + 39K) / 39K * 1.15V = 12.65V
V(VOUT)1 = (390K + 26.1K) / 26.1K * 1.15V = 18.33V
NEN
1
0
0
SEL
X
0
1
VOUT
High Z
VOUT0
VOUT1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL97702
Typical Performance Curves
90
85
80
2.7V
75
3.6V
70
4.2V
90
85
80
2.7V
75
70
3.6V
4.2V
65
0
50 100 150
LOAD CURRENT (mA)
FIGURE 2. EFFICIENCY vs LOAD CURRENT(VOUT = 18.3V)
L = 10µH (CDRH4D28C-100NC) C = 6.6µF
65
0
50 100
IOUT (mA)
FIGURE 3. EFFICIENCY vs IOUT (VOUT = 18.3V)
L = 6.8µH (TDK RLF7030) C = 6.6µF
150
90
85
3.6V
80 2.7V
75
4.2V
70
65
0
50 100 150
IOUT (mA)
FIGURE 4. EFFICIENCY vs IOUT(VOUT = 12.6V)
L = 6.8µH (TDK RLF7030) C = 6.6µF
200
90
85
3.6V
80 2.7V
75
4.2V
70
65
0
50 100 150
IOUT (mA)
200
FIGURE 5. EFFICIENCY vs IOUT (VOUT = 12.7V)
L = 10µH (CDRH4D28C-100NC) C = 6.6µF
FIGURE 6. START-UP TO 12V @ SEL = 0
(VDD=3.6V, RL=360Ω)
5
FIGURE 7. START-UP TO 18V @ SEL = 1
(VDD=3.6V, RL=360Ω)
FN7462.0
October 13, 2005
5 Page 
ISL97702
J2
GND_IN
J1
VDD_IN
VDD
C1 VDD C9
4.7µ/10V
100n
C2
10µ
J4
NSYNC
JP3
L1
6.8µH
U1
1 GND
LX 10
2 VDDOUT VOUT 9
3 VDD
NEN 8
4 NSYNC SEL 7
5 FB0
FB1 6
ISL97702
R1
390K
R6
39K
C3
OPEN
R2
OPEN
R4
OPEN
C4
OPEN
C7
3.3µF/50V
C8
100n
J7
VOUT
C6
1nF/50V
R5
R3
OPEN
26.1K
C5 VDD
OPEN
J1 2
VDD
J2 2
J3
GND_OUT
J6
NEN
J5
SEL
FIGURE 20. ISL97702 APPLICATION BOARD
Typical Application
Typical applications are passive- or active-matrix organic
light emitting diode displays (PMOLED, AMOLED) in
handheld devices. Applications with low power or screen
saver/ reduced brightness modes are also directly
supported.
Motivation: In the low power mode the OLED display
brightness (~pixel current) is reduced so that the display
drivers can operate with equally reduced power. Usually the
supply voltage is kept at the same level, although the pixel
voltage drops by several volts when the pixel current levels
are reduced. Here a further power reduction can be
achieved if the supply voltage for the display drivers is
reduced according to the pixel diode characteristic.
The ISL97702 allows selection between a nominal and a
reduced output voltage level in order to supply more
effectively OLED display drivers.
Components Selection
The input capacitance is normally 10µf~15µF and the output
capacitor is 3.3µf to 6.6µF. X5R or X7R type of ceramic
capacitor with correct voltage rating is recommended. The
output capacitor value will affect the output voltage ripple.
Higher value of the output capacitor, lower ripple of the
output voltage.
When choosing an inductor, make sure the inductor can
handle the average and peak currents given by following
formulas (80% efficiency assumed):
ILAVG
=
I--O-----U----T-----⋅---V----O-----U----T-
0.8 ⋅ VIN
(EQ. 1)
ILPK
=
ILAVG
+
1--
2
⋅
∆IL
(EQ. 2)
∆IL
=
V-----I--N-----⋅---(--V-----O----U----T-----–----V-----I--N----)
L ⋅ VOUT ⋅ fOSC
Where:
(EQ. 3)
• ∆IL is the peak-to-peak inductor current ripple in Amperes
• L inductance in H
• fOSC switching frequency, typically 1.0MHz
Optimal combination of the boost inductor L and the output
capacitor Cout are listed in table:
INDUCTOR (µH)
4.7
6.8
10
15
CAPACITOR (µF)
MIN MAX
2.2 10
3.3 10
4.7 10
6.8 10
Recommended Inductor and Ceramic capacitor
manufactures are listed in the following table:
INDUCTOR
Sumida: www.sumida.com
TDK: www.tdk.co.jp
Toko: www.tokoam.com
CERAMIC CAPACITOR
Taiyo Yuden: www.t-yuden.com
AVX:
www.avxcorp.com
Murata:
www.murata.com
11 FN7462.0
October 13, 2005
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ISL97702.PDF ] | |
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