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参数资料
| 型号： | ISL8013EVAL2Z |
| 厂商： | Intersil |
| 文件页数： | 15/17页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL8013 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 3A |
| 输入电压： | 2.7 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL8013 |
ISL8013
Power MOSFETs
TABLE 1. OUTPUT CAPACITOR VALUE vs V OUT
The power MOSFETs are optimized for best efficiency.
The ON-resistance for the P-MOSFET is typically 50m Ω
and the ON-resistance for the N-MOSFET is typically
50m Ω .
100% Duty Cycle
The ISL8013 features 100% duty cycle operation to
maximize the battery life. When the battery voltage
drops to a level that the ISL8013 can no longer maintain
the regulation at the output, the regulator completely
turns on the P-MOSFET. The maximum dropout voltage
V OUT (V)
0.8
1.2
1.5
1.8
2.5
3.3
3.6
C OUT (μF)
2 x 22
2 x 22
2 x 22
2 x 22
2 x 22
2 x 22
2 x 22
L (μH)
1.0~2.2
1.0~2.2
1.5~3.3
1.5~3.3
1.5~3.3
2.2~4.7
2.2~4.7
V O ? ? 1 – --------- ? (EQ. 3)
L ? f S
R 2 ? 0.8V
R 3 = ----------------------------------
under the 100% duty-cycle operation is the product of
the load current and the ON-resistance of the P-MOSFET.
Thermal Shut-Down
The ISL8013 has built-in thermal protection. When the
internal temperature reaches +140°C, the regulator is
completely shut down. As the temperature drops to
+115°C, the ISL8013 resumes operation by stepping
through the soft-start.
Applications Information
Output Inductor and Capacitor Selection
To consider steady state and transient operations,
ISL8013 typically uses a 1.5μH output inductor. The
higher or lower inductor value can be used to optimize
the total converter system performance. For example, for
higher output voltage 3.3V application, in order to
decrease the inductor current ripple and output voltage
ripple, the output inductor value can be increased. It is
recommended to set the ripple inductor current
approximately 30% of the maximum output current for
optimized performance. The inductor ripple current can
be expressed as shown in Equation 3:
? V O ?
? V IN ?
Δ I = -------------------------------------
The inductor’s saturation current rating needs to be at
least larger than the peak current. The ISL8013 protects
the typical peak current 4.8A. The saturation current
needs be over 5.5A for maximum output current
application.
ISL8013 uses internal compensation network and the
output capacitor value is dependent on the output
voltage. The ceramic capacitor is recommended to be
In Table 1, the minimum output capacitor value is given
for the different output voltage to make sure that the
whole converter system is stable. Additional output
capacitance should be added for better performances in
applications where high load transient or low output
ripple is required. It is recommended to check the
system level performance along with the simulation
model.
Output Voltage Selection
The output voltage of the regulator can be programmed
via an external resistor divider that is used to scale the
output voltage relative to the internal reference voltage
and feed it back to the inverting input of the error
amplifier. Refer to Figure 1.
The output voltage programming resistor, R 3 , will depend
on the value chosen for the feedback resistor and the
desired output voltage of the regulator. The value for the
feedback resistor is typically between 10k Ω and 100k Ω,
as shown in Equation 4.
(EQ. 4)
V OUT – 0.8V
If the output voltage desired is 0.8V, then R 3 is left
unpopulated and R 2 is shorted. There is a leakage
current from VIN to LX. It is recommended to preload the
output with 10μA minimum. For better performance, add
47pF in parallel with R 2 (100k Ω).
Input Capacitor Selection
The main functions for the input capacitor are to provide
decoupling of the parasitic inductance and to provide
filtering function to prevent the switching current flowing
back to the battery rail. Two 22μF X5R or X7R ceramic
capacitors are a good starting point for the input
capacitor selection.
X5R or X7R. The recommended X5R or X7R minimum
output capacitor values are shown in Table 1.
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications
at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by
Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any
infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any
patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
15
FN6309.3
November 23, 2009
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