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| 型号： | MAX17410GTM+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 23/45页 |
| 文件大小： | 0K |
| 描述： | IC CTLR QPWM 2PH FOR IMV 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
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Dual-Phase, Quick-PWM Controller
for IMVP6+ CPU Core Power Supplies
t ( V + 0 . 075 V )
MAX17410 Detailed Description
Free-Running, Constant On-Time PWM
Controller with Input Feed-Forward
The Quick-PWM control architecture is a pseudo-fixed-
frequency, constant-on-time, current-mode regulator
with voltage feed-forward (Figure 2). This architecture
relies on the output filter capacitor’s ESR to act as the
current-sense resistor, so the output ripple voltage pro-
vides the PWM ramp signal. The control algorithm is sim-
ple: the high-side switch on-time is determined solely by
a one-shot whose period is inversely proportional to the
input voltage, and directly proportional to the output volt-
age or the difference between the main and secondary
inductor currents (see the On-Time One-Shot section).
Another one-shot sets a minimum off-time. The on-time
one-shot triggers when the error comparator goes low,
the inductor current of the selected phase is below the
valley current-limit threshold, and the minimum off-time
one-shot times out. The controller maintains 180 ° out-of-
phase operation by alternately triggering the main and
secondary phases after the error comparator drops
below the output-voltage set point.
Dual 180° Out-of-Phase Operation
The two phases in the MAX17410 operate 180 ° out-of-
phase to minimize input and output filtering require-
ments, reduce electromagnetic interference (EMI), and
improve efficiency. This effectively lowers component
count—reducing cost, board space, and component
power requirements—making the MAX17410 ideal for
high-power, cost-sensitive applications.
Typically, switching regulators provide power using
only one phase instead of dividing the power among
several phases. In these applications, the input capaci-
tors must support high instantaneous current require-
ments. The high RMS ripple current can lower
efficiency due to I 2 R power loss associated with the
input capacitor ’s effective series resistance (ESR).
Therefore, the system typically requires several low-
ESR input capacitors in parallel to minimize input volt-
age ripple, to reduce ESR-related power losses, and to
meet the necessary RMS ripple current rating.
With the MAX17410, the controller shares the current
between two phases that operate 180 ° out-of-phase, so
the high-side MOSFETs never turn on simultaneously
during normal operation. The instantaneous input cur-
rent of either phase is effectively halved, resulting in
reduced input voltage ripple, ESR power loss, and RMS
ripple current (see the Input Capacitor Selection sec-
tion). Therefore, the same performance may be
achieved with fewer or less expensive input capacitors.
+5V Bias Supply (V CC and V DD )
The Quick-PWM controller requires an external +5V
bias supply in addition to the battery. Typically, this
+5V bias supply is the notebook’s 95% efficient +5V
system supply. Keeping the bias supply external to the
IC improves efficiency and eliminates the cost associat-
ed with the +5V linear regulator that would otherwise be
needed to supply the PWM circuit and gate drivers. If
stand-alone capability is needed, the +5V bias supply
can be generated with an external linear regulator.
The +5V bias supply must provide V CC (PWM con-
troller) and V DD (gate-drive power), so the maximum
current drawn is:
I BIAS = I CC + f SW ( Q G ( LOW ) + Q G ( HIGH ) )
where I CC is provided in the Electrical Characteristics
table, f SW is the switching frequency, and Q G(LOW) and
Q G(HIGH) are the MOSFET data sheet ’s total gate-
charge specification limits at V GS = 5V.
V IN and V DD can be connected together if the input
power source is a fixed +4.5V to +5.5V supply. If the
+5V bias supply is powered up prior to the battery sup-
ply, the enable signal ( SHDN going from low to high)
must be delayed until the battery voltage is present to
ensure startup.
Switching Frequency
IN (Pin 20) Open-Circuit Protection
The MAX17410 input sense (IN) is used to adjust the on-
time. An internal resistor sets the switching frequency to
300kHz per phase. IN is high impedance in shutdown.
On-Time One-Shot
The core of each phase contains a fast, low-jitter,
adjustable one-shot that sets the high-side MOSFET’s
on-time. The one-shot for the main phase varies the on-
time in response to the input and feedback voltages.
The main high-side switch on-time is inversely propor-
tional to the input voltage as measured by the V+ input,
and proportional to the feedback voltage (V FB ):
t ON ( MAIN ) = SW FB
V IN
where the switching period (t SW = 1/f SW ) is set to 3.3μs
internally, and 0.075V is an approximation to accommo-
date the expected drop across the low-side MOSFET
switch.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17411GTM+ | 功能描述:电流型 PWM 控制器 IMVP7 CPU & Graphics Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17411GTM+T | 功能描述:电流型 PWM 控制器 IMVP7 CPU & Graphics Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17411RGTM+ | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17411RGTM+T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17411RGTM+TW | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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