参数资料
型号: MAX8760ETL+
厂商: Maxim Integrated Products
文件页数: 36/39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: 50
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: 管件
Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
CMN
CMP
MAX8760
MAIN
PHASE
L1
R SENSE
R A
R B
PC BOARD TRACE
ERROR
OAIN+
R FBS
RESISTANCE
CPU SENSE
POINT
COMPARATOR
OAIN-
FB
R F
R A
R B
PC BOARD TRACE
RESISTANCE
Figure 10. Voltage-Positioning Gain
CSP
CSN
SECOND
PHASE
L2
R SENSE
increased load, and must always be greater than 1. As
h approaches 1, the absolute minimum dropout point,
the inductor current cannot increase as much during
each switching cycle and V SAG greatly increases
unless additional output capacitance is used.
A reasonable minimum value for h is 1.5, but adjusting
this up or down allows tradeoffs between V SAG , output
capacitance, and minimum operating voltage. For a
given value of h, the minimum operating voltage can be
Dropout design example:
V FB = 1.4V
K MIN = 3μs for f SW = 300kHz
t OFF(MIN) = 400ns
V VPS = 3mV/A × 30A = 90mV
V DROP1 = V DROP2 = 150mV (30A load)
h = 1.5 and η OUTPH = 2
V IN ( MIN ) = η OUTPH ?
V FB - V VPS + V DROP 1
1 - η OUTPH ?
? ?
? ?
calculated as:
?
?
?
?
?
?
?
?
? h x t OFF ( MIN ) ? ?
? K
? 1 . 4 V - 90 mV + 150 mV ?
V IN ( MIN ) = 2 x ? ?
? 1 - 2 x ( 0 . 4 μ s x 1 . 5 / 3 . 0 μ s ?
+ 150 mV - 150 mV + 90 mV = 4 . 96 V
Calculating again with h = 1 gives the absolute limit of
dropout:
+ V DROP 2 - V DROP 1 + V VPS
where η OUTPH is the total number of out-of-phase switch-
ing regulators, V VPS is the voltage-positioning droop,
V DROP1 and V DROP2 are the parasitic voltage drops in
the discharge and charge paths (see the On-Time One-
Shot (TON) section), t OFF(MIN) is from the Electrical
Characteristics table, and K is taken from Table 6. The
absolute minimum input voltage is calculated with h = 1.
If the calculated V IN(MIN) is greater than the required min-
imum input voltage, then reduce the operating frequency
or add output capacitance to obtain an acceptable V SAG .
If operation near dropout is anticipated, calculate V SAG to
be sure of adequate transient response.
? 1 . 4 V - 90 mV + 150 mV ?
V IN ( MIN ) = 2 x ? ?
? 1 - 2 x ( 0 . 4 μ s x 1 . 0 / 3 . 0 μ s ?
+ 150 mV - 150 mV + 90 mV = 4 . 07 V
Therefore, V IN must be greater than 4.1V, even with very
large output capacitance, and a practical input voltage
with reasonable output capacitance would be 5V.
36
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