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參數(shù)資料
| 型號(hào)： | EN5311QI |
| 廠商： | ENPIRION INC |
| 元件分類： | 穩(wěn)壓器 |
| 中文描述： | 1 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, QCC20 |
| 封裝： | 5 X 5 MM, 1.10 MM HEIGHT, HAOLGEN FREE AND ROHS COMPLIANT, QFN-20 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 290K |
| 代理商： | EN5311QI |
03799
11/24/2009
Rev:B
EN5311QI
Enpirion 2009 all rights reserved, E&OE
9
www.enpirion.com
values is indeterminate. These pins must not
be left floating.
The External Voltage Divider pin, VFB, may be
left floating for all VID settings other than the
VS0=VS1=VS2= ”1”.
VS2
VS1
VS0
VOUT
0
3.3V
0
1
2.5V
0
1
0
1.8V
0
1
1.5V
1
0
1.25V
1
0
1
1.2V
1
0
0.8V
1
User
Selectable
External Voltage Divider
As described above, the external voltage
divider option is chosen by connecting the
VS0, VS1, and VS2 pins to VIN or logic “high”.
The EN5311QI uses a separate feedback pin,
VFB, when using the external divider.
For applications with VIN ≤ 5.5V, VSENSE must
be connected to VOUT as indicated in Figure 4.
Figure 5 indicates the required connections for
VIN > 5.5V.
VIN
VSense
Vin
VS1
VS2
VS0
E
N5311
Q
I
10
μF
4.7uF
VOUT
Vout
GND
ENABLE
Ra
Rb
VFB
Figure 4. External Divider (VIN ≤ 5.5V).
The output voltage is selected by the following
formula:
()
Rb
Ra
OUT
V
+
=
1
603
.
0
Ra must be chosen as 200KΩ to maintain loop
gain. Then Rb is given as:
Ω
=
603
.
0
10
2
.
1
5
OUT
b
V
x
R
VOUT can be programmed over the range of
0.6V to VIN – 0.6V (0.6 is the nominal full load
dropout voltage including margin).
VIN
VSense
Vin
VS1
VS2
VS0
EN531
1QI
10
μF
4.7uF
VOUT
Vout
GND
ENABLE
Ra
Rb
VFB
27pF
Ca
Figure 5. External Divider (VIN > 5.5V).
For applications where VIN > 5.5V, the VSENSE
connection is not necessary, but the addition of
CA = 27pF is required.
Dynamically Adjustable Output
The EN5311QI is designed to allow for
dynamic switching between the predefined VID
voltage levels. The inter-voltage slew rate is
optimized to prevent excess undershoot or
overshoot
as
the
output
voltage
levels
transition. The slew rate is identical to the soft-
start slew rate of 1.65V/mS.
Dynamic transitioning between internal VID
settings and the external divider is not allowed.
Input and Output Capacitors
The input capacitance requirement is 4.7uF.
Enpirion recommends that a low ESR MLCC
capacitor be used. The input capacitor must
use a X5R or X7R or equivalent dielectric
formulation.
Y5V or equivalent dielectric
formulations lose capacitance with frequency,
bias, and with temperature, and are not
suitable for switch-mode DC-DC converter
input and output filter applications.
Table 1. VID voltage select settings.
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