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參數(shù)資料
| 型號： | MAX1875EEG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Fixed-Point Digital Signal Processor 288-BGA MICROSTAR |
| 中文描述： | DUAL SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, QSOP-24 |
| 文件頁數(shù)： | 7/21頁 |
| 文件大?。?/td> | 493K |
| 代理商： | MAX1875EEG |
Detailed Description
DC-DC PWM Controller
The MAX1875/MAX1876 step-down converters use a
PWM voltage-mode control scheme (Figure 2) for each
out-of-phase controller. The controller generates the
clock signal by dividing down the internal oscillator or
SYNC input when driven by an external clock, so each
controller
’
s switching frequency equals half the oscillator
frequency (f
SW
= f
OSC
/2). An internal transconductance
error amplifier produces an integrated error voltage 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,
REG1
’
s high-side N-channel MOSFET turns on and
remains on until either the appropriate duty cycle or until
the maximum duty cycle is reached. REG2 operates out-
of-phase, so the second high-side MOSFET turns on at
each falling edge of the clock. During each high-side
MOSFET
’
s on-time, the associated inductor current
ramps up.
During the second-half of the switching cycle, the high-
side MOSFET 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. Under overload conditions, when the induc-
tor current exceeds the selected valley current-limit (see
the
Current-Limit Circuit (ILIM_)
section), the high-side
MOSFET does not turn on at the appropriate clock edge
and the low-side MOSFET remains on to let the inductor
current ramp down.
Synchronized Out-of-Phase Operation
The two independent regulators in the MAX1875/
MAX1876 operate 180
°
out-of-phase to reduce input fil-
tering requirements, reduce electromagnetic interference
(EMI), and improve efficiency. This effectively lowers
component cost and saves board space, making the
MAX1875/MAX1876 ideal for cost-sensitive applications.
Dual-switching regulators typically operate both
controllers in-phase, and turn on both high-side
MOSFETs at the same time. The input capacitor must
then support the instantaneous current requirements of
both controllers simultaneously, resulting in increased
ripple voltage and current when compared to a single
switching regulator. The higher RMS ripple current
lowers efficiency due to power loss associated with the
input capacitor
’
s effective series resistance (ESR). This
typically requires more low-ESR input capacitors in
parallel to minimize input voltage ripple and ESR-related
losses, or to meet the necessary ripple-current rating.
M
Dual 180° Out-of-Phase PWM Step-
Down Controllers with POR
_______________________________________________________________________________________
7
Pin Description (continued)
PIN
14
NAME
DH1
FUNCTION
High-Side Gate Driver Output for Regulator 1 (REG1). DH1 swings from LX1 to BST1.
15
LX1
External Inductor Connection for Regulator 1 (REG1). Connect LX1 to the switched side of the
inductor. LX1 serves as the lower supply rail for the DH1 high-side gate driver.
16
BST1
Boost Flying-Capacitor Connection for Regulator 1 (REG1). Connect BST1 to an external ceramic
capacitor and diode according to Figure 1.
17
18
DL1
PGND
Low-Side Gate-Driver Output for Regulator 1 (REG1). DL1 swings from PGND to V
L
.
Power Ground
19
V
L
Internal 5V Linear-Regulator Output. Supplies the regulators and powers the low-side gate drivers
and external boost circuitry for the high-side gate drivers.
20
DL2
Low-Side Gate-Driver Output for Regulator 2 (REG2). DL2 swings from PGND to V
L
.
Boost Flying-Capacitor Connection for Regulator 2 (REG2). Connect BST2 to an external ceramic
capacitor and diode according to Figure 1.
21
BST2
22
LX2
External Inductor Connection for Regulator 2 (REG2). Connect LX2 to the switched side of the
inductor. LX2 serves as the lower supply rail for the DH2 high-side gate driver.
23
DH2
High-Side Gate-Driver Output for Regulator 2 (REG2). DH2 swings from LX2 to BST2.
24
EN
Active-High Enable Input. A logic low shuts down both controllers. Connect to V
L
for always-on
operation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1875EEG+ | 功能描述:電壓模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1875EEG+T | 功能描述:電壓模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1875EEG-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1875EVKIT | 功能描述:DC/DC 開關(guān)控制器 Evaluation Kit for the MAX1875 MAX1876 MAX1858 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1876AEEG | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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