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参数资料
| 型号： | MAX5073ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/25页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 1A/2A 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 28 V |
| 输入电压： | 4.5 V ~ 23 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 2.2MHz |
| 电流 - 输出： | 1A，2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
2.2MHz, Dual-Output Buck or Boost Converter
with Internal Power MOSFETs
PGOOD2
OUTPUT2
2.5V/1A
28 27 26 25 24 23 22
OUTPUT1
3.3V/2A
VL
CLOCK
OUT
SOURCE2 PGND SGND SOURCE1 PGOOD2
1 CLKOUT PGOOD1 21
VL
INPUT
2 BST2/VDD2
3 DRAIN2
EP
SGND
BST1/VDD1 20
DRAIN1 19
INPUT
4 DRAIN2
DRAIN1 18
ON
OFF
5 EN2
MAX5073
EN1 17
ON
OFF
6 FB2
7 COMP2
FB1 16
COMP1 15
SYNC N.C. OSC
8 9 10
V+
11
VL
12
VL BYPASS
13 14
SGND
SYSTEM
V IN = 5.5V TO 23V
PGND
CLOCK
SGND
*CONNECT PGND AND SGND TOGETHER AT ONE POINT NEAR THE
RETURN TERMINALS OF THE V+ AND VL BYPASS CAPACITORS.
Figure 1. MAX5073 Dual Buck Regulator Application Circuit
Detailed Description
PWM Controller
The MAX5073 converter uses a pulse-width modulation
(PWM) voltage-mode control scheme for each out-of-
phase controller. It is nonsynchronous rectification and
uses an external low-forward-drop Schottky diode for
rectification. The controller generates the clock signal
by dividing down the internal oscillator or the SYNC
input when driven by an external clock, so each con-
troller’s switching frequency equals half the oscillator
frequency (f SW = f OSC / 2). An internal transconduc-
tance error amplifier produces an integrated error volt-
age at the COMP pin, providing high DC accuracy. The
voltage at COMP sets the duty cycle using a PWM
comparator and a ramp generator. At each rising edge
of the clock, converter 1’s high-side n-channel MOSFET
turns on and remains on until either the appropriate or
maximum duty cycle is reached, or the maximum cur-
rent limit for the switch is detected. Converter 2 oper-
ates out-of-phase, so the second high-side MOSFET
turns on at each falling edge of the clock.
In the case of buck operation (Figure 1), during each
high-side MOSFET’s on-time, the associated inductor cur-
rent ramps up. During the second half of the switching
cycle, the high-side MOSFET turns off and forward biases
the Schottky rectifier. During this time, the SOURCE volt-
age is clamped to 0.4V (V D ) below ground. The inductor
releases the stored energy as its current ramps down,
and provides current to the output. The bootstrap capaci-
tor is also recharged from the inductance energy when
the MOSFET turns off. The circuit goes in discontinuous
conduction mode operation at light load, when the induc-
tor current completely discharges before the next cycle
commences. Under overload conditions, when the induc-
tor current exceeds the peak current limit of the respec-
tive switch, the high-side MOSFET turns off quickly and
waits until the next clock cycle.
In the case of boost operation, the MOSFET is a low-
side switch (Figure 8). During each on-time, the induc-
tor current ramps up. During the second half of the
switching cycle, the low-side switch turns off and for-
ward biases the Schottky diode. During this time, the
DRAIN voltage is clamped to 0.4V (V D ) above V OUT_
and the inductor provides energy to the output as well
as replenishes the output capacitor charge.
10
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| MAX5073ETJ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5074AAUP+T | 制造商:Maxim Integrated Products 功能描述: |
| MAX5074AUP | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX5074AUP+ | 功能描述:功率驱动器IC for Iso IEEE 802.3af PD & Telecom Aps RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX5074AUP+T | 功能描述:功率驱动器IC for Iso IEEE 802.3af PD & Telecom Aps RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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