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| 型号： | MAX8717ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/30页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PWR SUP 28-TQFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4 V ~ 26 V |
| 输出数： | 2 |
| 输出电压： | 3.3V，5V，1 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
Pin Description (continued)
PIN
MAX8716
MAX8717/
MAX8756/
NAME
FUNCTION
MAX8757
14
15
16
—
—
17
18
19
16
17
—
18
19
20
21
22
DL2
V DD
GND
PGND
AGND
DL1
LX1
DH1
Low-Side Gate-Driver Output for SMPS2. DL2 swings from PGND to V DD.
Supply Voltage Input for the DL_ Gate Drivers. Connect to a 5V supply.
Power and Analog Ground. Connect backside pad to GND.
Power Ground
Analog Ground. Connect backside pad to AGND.
Low-Side Gate-Driver Output for SMPS1. DL1 swings from PGND to V DD.
Inductor Connection for SMPS1. Connect LX1 to the switched side of the inductor. LX1
is the lower supply rail for the DH1 high-side gate driver.
High-Side Gate-Driver Output for SMPS1. DH1 swings from LX1 to BST1.
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor and
20
23
BST1
diode as shown in Figure 1. An optional resistor in series with BST1 allows the DH1 turn-
on current to be adjusted.
21
22
24
25
CSH1
CSL1
Positive Current-Sense Input for SMPS1. Connect to the positive terminal of the current-
sense element. Figure 8 describes two different current-sensing options.
Negative Current-Sense Input for SMPS1. Connect to the negative terminal of the
current-sense element. Figure 8 describes two different current-sensing options.
Feedback Input for SMPS1. Connect FB1 to V CC for fixed 3.3V output for the
23
26
FB1
MAX8716/MAX8717/MAX8757, or a fixed 1.5V for the MAX8756. In adjustable mode,
FB1 regulates to 1V.
24
27
PGOOD1
SMPS1 Open-Drain Power-Good Output. PGOOD1 is low when SMPS1 is more than
10% below its regulation threshold, during soft-start, and in shutdown.
SMPS1 Peak Current-Limit Threshold Adjustment. Connect ILIM1 to V CC to enable the
default 50mV current-limit threshold. In adjustable mode, the current-limit threshold
—
28
ILIM1
across CSH1 and CSL1 is precisely 1/10 the voltage seen at ILIM1 over a 500mV to
2.0V range. The logic threshold for switchover to the 50mV default value is
approximately V CC - 1V.
EP
EP
EP
Exposed Pad. Connect exposed backside pad to analog ground.
Detailed Description
The MAX8716/MAX8717/MAX8756/MAX8757 Standard
Application Circuit (Figure 1) generates the 5V/5A and
3.3V/5A typical of the main supplies in notebook com-
puters. The input supply range is 6V to 24V. See Table 1
for component selections, while Table 2 lists the compo-
nent manufacturers.
The MAX8716/MAX8717/MAX8756/MAX8757 contain
two interleaved fixed-frequency, step-down controllers
designed for low-voltage power supplies. The optimal
interleaved architecture guarantees out-of-phase oper-
ation, which reduces the input capacitor ripple.
SMPS 5V Bias Supply (V CC and V DD )
The MAX8716/MAX8717/MAX8756/MAX8757 switch-
mode power supplies (SMPS) require a 5V bias supply
in addition to the high-power input supply (battery or
AC adapter). V DD is the power rail for the MOSFET gate
drive, and V CC is the power rail for the IC. Connect the
external 4.5V to 5.5V supply directly to V DD and con-
nect V DD to V CC through an RC filter, as shown in
Figure 1. The maximum supply current required is:
I BIAS = I CC + f SW (Q G(NL1) + Q G1(NH1) +Q G2(NL2) +
Q G2(NH2) ) = 1.3mA to 40mA
where I CC is 1.3mA, f SW is the switching frequency,
and Q G_ are the MOSFET data sheet ’s total gate-
charge specification limits at V GS = 5V.
12
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