参数资料
型号: MAX8760ETL+T
厂商: Maxim Integrated Products
文件页数: 21/39页
文件大小: 0K
描述: IC CNTRLR QUICK PWM 40-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
系列: Quick-PWM™
应用: 控制器,6 位 VID AMD 移动式 Turion?
输入电压: 4 V ~ 28 V
输出数: 2
输出电压: 0.38 V ~ 1.55 V
工作温度: 0°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 40-WFQFN 裸露焊盘
供应商设备封装: 40-TQFN-EP(6x6)
包装: 带卷 (TR)
Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
D0–D5
D0
D1
DECODER
SUSPEND
D2
D3
D4
IN
OUT
0
MUX
D5
S0, S1
DECODER
S0
S1
IN
OUT
1
OUT
DAC
SEL
SEL
SUS
2.5V
SUS 3-LEVEL
DECODER
1.0V
Figure 3. Internal Multiplexers Functional Diagram
The slew-rate controller transitions the output voltage in
12.5mV steps during soft-start, soft-shutdown, and sus-
pend-mode transitions. The total time for a transition
depends on R TIME , the voltage difference, and the
accuracy of the MAX8760’s slew-rate clock, and is not
dependent on the total output capacitance. The greater
the output capacitance, the higher the surge current
required for the transition. The MAX8760 automatically
controls the current to the minimum level required to
complete the transition in the calculated time, as long
as the surge current is less than the current limit set by
ILIM. The transition time is given by:
where f SLEW = 500kHz ? 30k ? / R TIME , V OLD is the
original DAC setting, V NEW is the new DAC setting, and
V LSB = 12.5mV is the DAC’s smallest voltage incre-
ment. The additional two clock cycles on the falling
edge time are due to internal synchronization delays.
See TIME Frequency Accuracy in the Electrical
Characteristics table for f SLEW limits.
The practical range of R TIME is 15k ? to 150k ? , corre-
sponding to 1.0μs to 10μs per 12.5mV step. Although
the DAC takes discrete steps, the output filter makes
the transitions relatively smooth. The average inductor
current required to make an output voltage transition is:
? for V OUT ri sin g
f SLEW ?
V LSB
?
t SLEW ≈
1 ? V OLD ? V NEW ?
?
I L ? C OUT × V LSB × f SLEW
? ? V OLD NEW ?
f SLEW ? ? ?
? ? ? + 2 ? for V OUT falling
? ?
t SLEW ≈
V LSB ?
1 ? V ?
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21
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