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参数资料
| 型号： | MAX17482GTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/48页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM DUAL IMVP-6.5 40TQFN |
| 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，Intel IMVP-6，IMVP-6.5? |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 105°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（5x5） |
| 包装： | 带卷 (TR) |
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Dual-Phase, Quick-PWM Controllers for
IMVP-6+/IMVP-6.5 CPU Core Power Supplies
T SW ( V FB + 0 . 075 V )
Dual 180° Out-of-Phase Operation
The two phases in the MAX17021/MAX17082/
MAX17482 operate 180° out-of-phase to minimize input
and output filtering requirements, reduce electromagnetic
interference (EMI), and improve efficiency. This effectively
lowers component count—reducing cost, board space,
and component power requirements —making the
MAX17021/MAX17082/MAX17482 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 MAX17021/MAX17082/MAX17482, the con-
troller 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 current of either phase is effec-
tively halved, resulting in reduced input-voltage ripple,
ESR power loss, and RMS ripple current (see the Input
Capacitor Selection section). Therefore, the same per-
formance can 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 tied 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 supply, the
enable signal ( SHDN going from low to high) must be
delayed until the battery voltage is present to ensure
startup.
Switching Frequency (TON)
Connect a resistor (R TON ) between TON and V IN to set
the switching period T SW = 1/f SW , per phase:
T SW = 16.3pF x (R TON + 6.5k Ω )
A 96.75k Ω to 303.25k Ω corresponds to switching peri-
ods of 167ns (600kHz) to 500ns (200kHz), respectively.
High-frequency (600kHz) operation optimizes the appli-
cation for the smallest component size, trading off effi-
ciency due to higher switching losses. This might be
acceptable in ultra-portable devices where the load
currents are lower and the controller is powered from a
lower voltage supply. Low-frequency (200kHz) opera-
tion offers the best overall efficiency at the expense of
component size and board space.
TON Open-Circuit Protection
The TON input includes open-circuit protection to avoid
long, uncontrolled on-times that could result in an over-
voltage condition on the output. The MAX17021/
MAX17082/MAX17482 detect an open-circuit fault if the
TON current drops below 10μA for any reason—the
TON resistor (R TON ) is unpopulated, a high resistance
value is used, the input voltage is low, etc. Under these
conditions, the MAX17021/MAX17082/MAX17482 stop
switching (DH_ and DL_ pulled low) and immediately
set the fault latch. Toggle SHDN or cycle the V CC
power supply below 0.5V to clear the fault latch and
reactivate the controller.
On-Time One-Shot
The core of each phase contains a fast, low-jitter,
adjustable one-shot that sets the high-side MOSFETs
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 TON
input, and proportional to the feedback voltage (V FB ):
t ON ( MAIN ) =
V IN
where the switching period (T SW = 1/f SW ) is set by the
resistor at the TON pin, and 0.075V is an approximation
to accommodate the expected drop across the low-
side MOSFET switch.
The one-shot for the secondary phase varies the on-
time in response to the input voltage and the difference
between the main and secondary inductor currents.
Two identical transconductance amplifiers integrate the
24
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