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| 型号： | MAX1864TEEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/25页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CONTROLLER 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | 电源控制器 |
| 输入电压： | 4.5 V ~ 28 V |
| 电流 - 电源： | 1mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
Pin Description (continued)
MAX1864
PIN
MAX1865
NAME
FUNCTION
Dual Mode Current-Limit Adjustment Input. Connect to VL for the default 250mV
current-limit threshold. In adjustable mode, the current-limit threshold voltage is 1/5th
9
13
ILIM
the voltage present at ILIM. Connect to a resistive-divider between VL and GND to
adjust V ILIM between 1V and 2.5V. The logic threshold for switchover to the 250mV
default value is approximately VL - 1V.
10
11
12
13
14
14
15
16
17
18
GND
DL
LX
DH
BST
Ground
Low-Side Gate-Driver Output. DL swings between GND and VL.
Inductor Connection. Used for current sense between IN and LX, and used for current
limit between LX and GND.
High-Side Gate-Driver Output. DH swings between LX and BST.
Boost Flying Capacitor Connection. Connect BST to the external boost diode and
capacitor as shown in the standard application circuit (Figures 1 and 6).
Internal 5V Linear-Regulator Output. Supplies the IC and powers the DL low-side gate
15
19
VL
driver and external boost diode and capacitor. Bypass with a 1μF or greater ceramic
capacitor to GND.
16
20
IN
Input Supply Voltage, 4.5V to 28V. Bypass to GND with a 1μF or greater ceramic
capacitor close to the IC.
Detailed Description
The MAX1864/MAX1865 power-supply controllers pro-
vide system power for cable and xDSL modems. The
main step-down DC-DC controller operates in a cur-
rent-mode pulse-width-modulation (PWM) control
scheme to ease compensation requirements and pro-
vide excellent load- and line-transient response.
The MAX1864 includes two analog gain blocks to regu-
late two additional positive auxiliary output voltages,
and the MAX1865 includes four analog gain blocks to
regulate three additional positive and one negative aux-
iliary output voltages. The positive regulator gain blocks
can be used to generate low-voltage rails directly from
the main step-down converter or higher voltages using
coupled windings from the step-down converter. The
negative gain block can be used in conjunction with a
coupled winding to generate -5V, -12V, or -15V.
DC-DC Controller
The MAX1864/MAX1865 step-down converters use a
pulse-width-modulated (PWM) current-mode control
scheme (Figure 2). An internal transconductance
amplifier establishes an integrated error voltage at the
COMP pin. The heart of the current-mode PWM con-
troller is an open-loop comparator that compares the
integrated voltage-feedback signal against the ampli-
fied current-sense signal plus the slope compensation
ramp. At each rising edge of the internal clock, the
high-side MOSFET turns-on until the PWM comparator
trips or the maximum duty cycle is reached. During this
on-time, current ramps up through the inductor, sourc-
ing current to the output and storing energy in a mag-
netic field. The current-mode feedback system
regulates the peak inductor current as a function of the
output voltage error signal. Since the average inductor
current is nearly the same as the peak inductor current
(assuming that the inductor value is relatively high to
minimize ripple current), the circuit acts as a switch-
mode transconductance amplifier. It pushes the output
LC filter pole, normally found in a voltage-mode PWM,
to a higher frequency. To preserve inner loop stability
and eliminate inductor stair-casing, a slope-compensa-
tion ramp is summed into the main PWM comparator.
During the second-half of the cycle, the high-side MOS-
FET turns off and the low-side N-channel MOSFET turns
on. Now the inductor releases the stored energy as its
current ramps down, providing current to the output.
Therefore, the output capacitor stores charge when the
inductor current exceeds the load current and dis-
charges when the inductor current is lower, smoothing
10
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相关代理商/技术参数 |
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| MAX1864TEEE+ | 功能描述:DC/DC 开关控制器 xDSL/Cable Modem Triple/Quint Output RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1864TEEE+T | 功能描述:电流和电力监控器、调节器 xDSL/Cable Modem Triple/Quint Output RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1864TEEE-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1864UEEE | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1864UEEE-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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