参数资料
| 型号： | ISL97651ARTZ-T |
| 厂商： | Intersil |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY HP 4CHN 36-TQFN |
| 标准包装： | 4,000 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 400µA |
| 电源电压： | 4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 带卷 (TR) |
ISL97651
Output Capacitor (Buck Converter)
Four 10μF or two 22μF ceramic capacitors are
recommended for this part. The overshoot and undershoot
will be reduced with more capacitance, but the recovery time
will be longer.
TABLE 9. BUCK OUTPUT CAPACITOR RECOMMENDATION
The pumps use pulse width modulation to adjust the pump
period, depending on the load present. The pumps can
provide 30mA for V OFF and 20mA for V ON .
The positive charge pump can generate double or triple
V SUP voltage depending on the configuration of C2+ and
C2- pins. If the C2+ pin connects to C1+, it is the voltage
CAPACITOR
SIZE
VENDOR
PART NUMBER
doubler, and if C2+ connects C2- via a capacitor, it
configured a voltage tripler.
10μF/6.3V
0805 TDK
C2012X5R0J106M
10μF/6.3V
0805 Murata
GRM21BR60J106K
Positive Charge Pump Design Consideration
The positive charge pump integrates all the diodes (D1, D2
22μF/6.3V
100μF/6.3V
1210 TDK
1206 Murata
C3216X5R0J226M
GRM31CR60J107M
and D3 shown in the block diagram in Figure 13) required for
x2 (V SUP doubler) and x3 (V SUP tripler) modes of operation.
During the chip start-up sequence the mode of operation is
PI Loop Compensation (Buck Converter)
The buck converter of ISL97651 can be compensated by a
RC network connected from CM2 pin to ground. C9 = 4.7nF
and R2 = 2k RC network is used in the demo board. The
larger value resistor can lower the transient overshoot,
however, at the expense of stability of the loop.
The stability can be optimized in a similar manner to that
Bootstrap Capacitor (C16)
This capacitor is used to provide the supply to the high driver
circuitry for the buck MOSFET. The bootstrap supply is
automatically detected when the charge pump is enabled.
With both C7 and C8 present, the x3 mode of operation is
detected. With C7 present, C8 open and with C1+ shorted to
C2+, the x2 mode of operation will be detected.
Due to the internal switches to V SUP (M1, M2 and M3),
P OUT is independent of the voltage on V SUP until the charge
pump is enabled. This is important for TFT applications
where the negative charge pump output voltage (V OFF ) and
A VDD supplies need to be established before P OUT .
The maximum P OUT charge pump current can be estimated
from Equation 15 assuming a 50% switching duty:
I MAX ( 2x ) ～ min of 50mA or
2 ? V SUP – 2 ? V DIODE ( 2 ? I MAX ) – V ( V ON )
( 2 ? ( 2 ? R ONH + R ONL ) )
3 ? V SUP – 3 ? V DIODE ( 2 ? I MAX ) – V ( V ON )
( 2 ? ( 3 ? R ONH + 2 ? R ONL ) )
formed by an internal diode and capacitor combination. A
1μF is recommended for ISL97651. A low value capacitor
can lead to overcharging and in turn damage the part.
If the load is too light, the on-time of the low side diode may
be insufficient to replenish the bootstrap capacitor voltage. In
this case, if V IN - V BUCK < 1.5V, the internal MOSFET pull-
up device may be unable to turn-on until V LOGIC falls.
Hence, there is a minimum load requirement in this case.
---------------------------------------------------------------------------------------------------------------------- ? 0.95A
I MAX ( 3x ) ～ min of 50mA or
---------------------------------------------------------------------------------------------------------------------- ? 0.95V
(EQ. 15)
The minimum load can be adjusted by the feedback
resistors to FBL.
The bootstrap capacitor can only be charged when the
higher side MOSFET is off. If the load is too light which can
not make the on time of the low side diode be sufficient to
replenish the boot strap capacitor, the MOSFET can’t turn
on. Hence there is minimum load requirement to charge the
bootstrap capacitor properly.
Linear-Regulator Controllers (V ON and V OFF )
The ISL97651 include 2 independent charge pumps (see
Figure 13). The negative charge pump inverters the V SUP
Note: V DIODE (2 ? I MAX ) is the on-chip diode voltage as a
function of I MAX and V DIODE (40mA) < 0.7V.
In voltage doubler configuration, the maximum V ON is as
given by Equation 16:
V ON_MAX(2x) = 2 ? ( V SUP – V DIODE ) – 2 ? I OUT ? ( 2 ? r ONH + r ONL )
(EQ. 16)
For Voltage Tripler:
V ON_MAX(3x) = 3 ? ( V SUP – V DIODE ) – 2 ? I OUT ? ( 3 ? r ONH + 2 ? r ONL )
(EQ. 17)
V ON = V FBP ? ? 1 + ------- ?
voltage and provides a regulated negative output voltage.
The positive charge pump doubles or triples the V SUP
voltage and provides a regulated positive output voltage.
The regulation of both the negative and positive charge
pumps is generated by internal comparator that senses the
output voltage and compares it with the internal reference.
14
V ON output voltage is determined by Equation 18:
? R 8 ?
? R 9 ?
(EQ. 18)
FN7493.3
April 24, 2009
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