参数资料
| 型号： | ISL97702IRZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.13A DL 10DFN |
| 标准包装： | 1,000 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可调至 28V |
| 输入电压： | 2.3 V ~ 5.5 V |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 130mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
ISL97702
C7
3.3μF/50V
J7
J2
L1
6.8μH
R1
390K
C3
OPEN
R2
OPEN
C8
100n
VOUT
C6
1nF/50V
J3
GND_IN
1
U1
GND
LX 10
R6
39K
R4
OPEN
R5
26.1K
R3
OPEN
GND_OUT
J1
VDD_IN
J4
VDD
JP3
100n
C1
VDD C9
4.7μ/10V
C2
10μ
2
3
4
5
VDDOUT VOUT
VDD NEN
NSYNC SEL
FB0 FB1
ISL97702
9
8
7
6
C4
OPEN
C5
OPEN
VDD
J2 2
VDD
J1 2
J6
NEN
J5
NSYNC
FIGURE 20. ISL97702 APPLICATION BOARD
SEL
I LPK = I LAVG + --- ? ? I L
V IN ? ( V OUT – V IN )
L ? V OUT ? f OSC
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.
1
2
? I L = ---------------------------------------------------
Where:
(EQ. 2)
(EQ. 3)
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
? ? I L is the peak-to-peak inductor current ripple in Amperes
? L inductance in H
? f OSC switching frequency, typically 1.0MHz
Optimal combination of the boost inductor L and the output
capacitor Cout are listed in table:
CAPACITOR (μF)
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
INDUCTOR (μH)
4.7
6.8
10
15
MIN
2.2
3.3
4.7
6.8
MAX
10
10
10
10
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.
Recommended Inductor and Ceramic capacitor
manufactures are listed in the following table:
When choosing an inductor, make sure the inductor can
handle the average and peak currents given by following
INDUCTOR
Sumida: www.sumida.com
CERAMIC CAPACITOR
Taiyo Yuden: www.t-yuden.com
formulas (80% efficiency assumed):
TDK:
www.tdk.co.jp
AVX:
www.avxcorp.com
I OUT ? V OUT
0.8 ? V IN
I LAVG = ----------------------------------
(EQ. 1)
Toko:
www.tokoam.com
Murata:
www.murata.com
11
FN7462.0
October 13, 2005
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