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| 型号： | MAX8764ETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/23页 |
| 文件大小： | 0K |
| 描述： | IC CNTRL STP DWN HS 20-TQFN |
| 标准包装： | 60 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 1.8V，2.5V，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： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 管件 |
High-Speed, Step-Down Controller with
Accurate Current Limit for Notebook Computers
Therefore, V IN must be greater than 3.13V, even with
very large output capacitance, and a practical input volt-
age with reasonable output capacitance would be 3.48V.
PC Board Layout Guidelines
Careful PC board layout is critical to achieving low
switching losses and clean, stable operation. The switch-
ing power stage requires particular attention (Figure 9). If
possible, mount all power components on the top side of
the board, with their ground terminals flush against one
another. Follow these guidelines for good PC board lay-
out:
? Keep the high-current paths short, especially at the
ground terminals. This practice is essential for stable,
4) Make the DC-DC controller ground connections as
shown in Figure 9 . This diagram can be viewed as
having two separate ground planes: power ground,
where all the high-power components go; and an ana-
log ground plane for sensitive analog components.
The analog ground plane and power ground plane
must meet only at a single point directly at the IC.
5) Connect the output power planes directly to the out-
put filter capacitor positive and negative terminals
with multiple vias. Place the entire DC-DC converter
circuit as close to the load as is practical.
Pin Configurations
jitter-free operation.
? Keep the power traces and load connections short.
This practice is essential for high efficiency. Using
thick copper PC boards (2oz vs. 1oz) can enhance
full-load efficiency by 1% or more. Correctly routing
TOP VIEW
CS 1
LATCH 2
SHDN 3
+
20 DH
19 LX
18 BST
PC board traces is a difficult task that must be
approached in terms of fractions of centimeters,
where a single milliohm of excess trace resistance
causes a measurable efficiency penalty.
? Minimize current-sensing errors by connecting CS
directly to the R SENSE terminal.
? When trade-offs in trace lengths must be made, it is
preferable to allow the inductor charging path to be
made longer than the discharge path. For example,
OVP 4
FB 5
OUT 6
ILIM 7
REF 8
UVP 9
PGOOD 10
MAX8764EEP
17 SKIP
16 V+
15 TON
14 V CC
13 V DD
12 DL
11 GND
it is better to allow some extra distance between the
input capacitors and the high-side MOSFET than to
allow distance between the inductor and the low-
side MOSFET or between the inductor and the out-
put filter capacitor.
QSOP
? Route high-speed switching nodes (BST, LX, DH, and
15
14
13
12
11
DL) away from sensitive analog areas (REF, FB, CS).
LX 16
10 V DD
Layout Procedure
1) Place the power components first, with ground termi-
DH 17
CS 18
9
8
DL
GND
nals adjacent (Q2 source, C IN- , C OUT- , D1 anode). If
possible, make all these connections on the top layer
with wide, copper-filled areas.
LATCH 19
SHDN 20
MAX8764ETP
7
6
PGOOD
UVP
2) Mount the controller IC adjacent to MOSFET Q2,
1
2
3
4
5
preferably on the back side opposite Q2 to keep LX,
GND, and the DL gate-drive lines short and wide. The
DL gate trace must be short and wide, measuring 10
to 20 squares (50 mils to 100 mils wide if the MOSFET
is 1in from the controller IC GND pin.
3) Group the gate-drive components (BST diode and
capacitor, V DD bypass capacitor) together near the
controller IC.
THIN QFN
Chip Information
TRANSISTOR COUNT: 2963
PROCESS: BiCMOS
______________________________________________________________________________________
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8764ETP+ | 功能描述:电流型 PWM 控制器 High-Speed Step Down 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 |
| MAX8764ETP+T | 功能描述:电流型 PWM 控制器 High-Speed Step Down 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 |
| MAX8764ETP-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 |
| MAX8765AETI+ | 功能描述:电池管理 Multichemistry Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX8765AETI+T | 功能描述:电池管理 Multichemistry Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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