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参数资料
| 型号： | ADP3162 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | 5-Bit Programmable 2-Phase Synchronous Buck Controller |
| 中文描述： | 5位可编程2相同步降压控制器 |
| 文件页数： | 11/12页 |
| 文件大小： | 151K |
| 代理商： | ADP3162 |
REV. A
ADP3162
–8–
Selecting a Standard Inductor
The companies listed in Table III can provide design consul-
tation and deliver power inductors optimized for high power
applications upon request.
Table III. Power Inductor Manufacturers
Coilcraft
(847) 639-6400; (800) 322-2645
Coiltronics
(561) 752-5000
Sumida Electric Company
(408) 982-9660
RSENSE
The value of RSENSE is based on the required maximum output
current. The current comparator of the ADP3162 has a mini-
mum current limit threshold of 69 mV. Note that the 69 mV
value cannot be used for the maximum specified nominal cur-
rent, as headroom is needed for ripple current and tolerances.
The current comparator threshold sets the peak of the inductor
current yielding a maximum output current, IO, which equals
twice the peak inductor current value less half of the peak-to-
peak inductor ripple current. From this the maximum value of
RSENSE is calculated as:
R
V
I
mV
AA
m
SENSE
CS CL
MIN
O
L RIPPLE
≤
+
=
+
=
()(
)
()
.
22
69
14
2
408
(3)
In this design example, 4 m
was chosen as the closest standard
value.
Once RSENSE has been chosen, the maximum output current can
be calculated at the point where current limit is reached, using
the maximum current sense threshold of 89 mV:
I
V
R
I
mV
m
AA
OUT CL
CS CL
MAX
SENSE
L RIPPLE
()
()(
)
()
..
=×
= ×
=
22
89
4
5 8
38 7
(4)
At output voltages below 375 mV, the current sense threshold is
reduced to 58 mV maximum, and the ripple current is negli-
gible. Therefore, at dead short the maximum output current is
reduced to:
I
mV
m
A
OUT SC
() =×
=
2
58
4
29
(5)
The capability of the resistor’s power rating should be checked
at maximum load current:
PI
R
SENSE RMS
SENSE
=×
()
2
(6)
where:
I
n
V
SENSE RMS
O
OUT
IN
()
2
=×
×
η
(7)
In this formula, n is the number of phases, and
η is the con-
verter efficiency, in this case assumed to be 85%. Combining
Equations 6 and 7 yields:
P
AV
V
mmW
R
SENSE
=×
×
×=
28
2
18
085
5
4
664
2
.
Output Resistance
Intel’s VRM 8.5 specification requires that the regulator
output voltage measured at the CPU pins drops when the
output current increases. The specified voltage drop corre-
sponds to a dc output resistance of:
R
VV
I
VV
A
m
OUT
ONL
OFL
O
=
=
=
1 845
1 755
28
32
..
.
(8)
The required dc output resistance can be achieved by terminating
the gm amplifier with a resistor. The value of the total termina-
tion resistance that will yield the correct dc output resistance:
R
nR
gR
m
mmho
m
k
T
I
SENSE
m
OUT
=
×
××
=
×
× ×
=
2
25
4
22
32
2
71
..
.
(9)
where nI is the division ratio from the output voltage signal of
the gm amplifier to the PWM comparator CMP1, gm is the
transconductance of the gm amplifier itself, and the factor of 2
is the result of the two-phase configuration.
Output Offset
Intel’s VRM 8.5 specification requires that at no load the output
voltage of the regulator module be offset to a higher value than
the nominal voltage corresponding to the VID code. The offset
is introduced by realizing the total termination resistance of the
gm amplifier with a divider connected between the REF pin and
ground. The resistive divider introduces an offset to the output
of the gm amplifier that, when reflected back through the gain
of the gm stage, accurately positions the output voltage near its
allowed maximum at light load. Furthermore, the output of the
gm amplifier sets the current sense threshold voltage. At no
load, the current sense threshold is increased by the peak of the
ripple current in the inductor and reduced by the delay between
sensing when the current threshold has been reached and when
the high side MOSFET actually turns off. These two factors are
combined with the inherent voltage (VGNL0), at the output of the
gm amplifier that commands a current sense threshold of 0 mV:
VV
IR
n
VV
L
tn
R
n
VV
Am
V
H
ns
m
V
GNL
L RIPPLE
OUT
I
IN
OUT
D
SENSE
I
GNL
=+
××
×
××
×
=+
× ×
×
××
×
=
0
2
1
58
32
25
2
51 8
1
60
2
4
25
1 194
()
..
.
φ
(10)
The divider resistors (RA for the upper, and RB for the lower)
can now be calculated assuming that the internal resistance of
the gm amplifier (ROGM) is 200 k
:
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3162JR | 制造商:Rochester Electronics LLC 功能描述:5-BIT PROGRMBLE 2PHASE SYNC. BCK. CNTRLR - Bulk 制造商:Analog Devices 功能描述: |
| ADP3162JR-REEL | 功能描述:IC REG BUCK 5BIT 2PHASE 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ADP3162JR-REEL7 | 制造商:Rochester Electronics LLC 功能描述:5-BIT PROGRMBLE 2PHASE SYNC. BCK. CNTRLR - Tape and Reel |
| adp3162jrz | 制造商:Rochester Electronics LLC 功能描述:5-BIT PROGRMBLE 2PHASE SYNC. BCK. CNTRLR - Bulk 制造商:Analog Devices 功能描述: |
| ADP3162JRZ-REEL7 | 功能描述:IC REG BUCK 5BIT 2PHASE 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
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