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参数资料
| 型号： | MAX8664BEEP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/26页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR DUAL OUT 20-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源 |
| 电流 - 电源： | 1.4mA |
| 电源电压： | 4.5 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-QSOP |
| 包装： | 带卷 (TR) |
Low-Cost, Dual-Output, Step-Down
Controller with Fast Transient Response
Table 5. Component List for Figure 5
DESIGNATION
C1, C13
C2, C3, C14, C15
C5
C6
C7, C16
C8, C17
C9, C18
C10, C19
C11, C20
C12
QTY
2
4
1
1
2
2
2
2
2
1
DESCRIPTION
0.01μF, 10V X7R ceramic
capacitors
10μF, 25V X5R ceramic capacitors
1μF, 25V X5R ceramic capacitor
1μF, 10V X5R ceramic capacitor
0.22μF, 10V X7R ceramic
capacitors
4700pF, 10V X7R ceramic
capacitors
470μF/2.5V POSCAP capacitors
Sanyo 2R5TPD470M6
10μF, 6.3V X5R ceramic capacitors
1000pF, 25V X7R ceramic
capacitors
4.7μF, 10V X5R ceramic capacitor
DESIGNATION
L1, L2
N1–N4
N5
R1
R2
R3, R11
R4
R5, R10
R6
R7
R8
R9
QTY
2
4
1
1
1
2
1
2
1
1
1
1
DESCRIPTION
1.43μH, 4.52m Ω inductors
Panasonic ETQP3H1E4BFA
n-channel MOSFETs
IRF7821 (8-pin SOs)
n-channel MOSFET
2N7002 (SOT23)
2.87k Ω ±1% resistor (0402 or 0603)
40.2k Ω ±1% resistor (0402 or 0603)
10k Ω ±1% resistors (0402 or 0603)
5.36k Ω ±1% resistor (0402 or 0603)
2.0 Ω ±5% resistors (1206)
2.26k Ω ±1% resistor (0402 or 0603)
10k Ω ±5% resistor (0402 or 0603)
75k Ω ±1% resistor (0402 or 0603)
25.5k Ω ±1% resistor (0402 or 0603)
R12
1
9.53k Ω ±1% resistor (0402 or 0603)
Power-Up and Sequencing
The MAX8664 features an OSC/EN12 input that is used
both for setting the switching frequency and as an
enable input for both controllers. A resistor from
OSC/EN12 to GND sets the switching frequency, and
when OSC/EN12 is high impedance, both controllers
enter low-power shutdown mode. This is easily
achieved with a transistor between the resistor and
GND. Figure 6a shows the startup configuration with
independent outputs. With REFIN2 connected to V CC ,
both controllers use the internal reference.
For tracking applications, connect REFIN2 to the center
of a resistive voltage-divider between the output of con-
troller 1 and GND. See Figure 6b. In this application,
the output of regulator 2 tracks the output voltage of
controller 1. The voltage-divider resistors set the
V OUT2 /V OUT1 ratio. A typical tracking application is for
the VTT supply of DDR memory.
Figure 6c shows one method of sequencing the out-
puts. Output 1 rises first. When PWRGD goes high, the
transistors allow the external reference to drive REFIN2
and output 2 rises. The circuit in Figure 6d functions
similarly, except the enable signal is supplied externally
instead of being driven by the PWRGD signal.
CHIP
ENABLE
V CC
V OUT1
V OUT2
ON
REFIN2
MAX8664
OSC/EN12
PWRGD
OFF
CHIP
ENABLE
Figure 6a. Two Independent Output Startup and Shutdown Waveforms
18
______________________________________________________________________________________
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