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參數(shù)資料
| 型號(hào)： | MAX1845 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit |
| 中文描述： | 雙路、高效率、降壓型控制器，帶有精確限流 |
| 文件頁數(shù)： | 9/27頁 |
| 文件大小： | 543K |
| 代理商： | MAX1845 |
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M
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
_______________________________________________________________________________________
9
Pin Description (continued)
PIN
QSOP
QFN
NAME
FUNCTION
7
3
PGOOD
Power-Good Open-Drain Output. PGOOD is low when either output voltage is off or is more than
10% above or below the normal regulation point.
8
4
OVP
Overvoltage Protection Threshold. An overvoltage fault occurs if the voltage on FB1 or FB2 is
greater than the programmed overvoltage trip threshold. Adjustment range is 1V (100%) to 1.8V
(180%). Connect OVP to GND to set the default overvoltage threshold of 114% of nominal.
Connect to V
CC
to disable OVP and clear the OVP latch.
9
5
UVP
U nd er vol ag e P otecti on Thr eshol d An und er vol ag e faul occur s i the vol ag e on FB1 or FB2 i s l ess
than the und er vol ag e tr p thr eshol d ( 70% of nom nal C onnect U V P to V
C C
to enab e und er vol ag e
p otecti on. C onnect to GN D to d sab e und er vol ag e p otecti on and cl ear the U V P l atch.
10
7
REF
+2.0V Reference Voltage Output. Bypass to GND with 0.22μF (min) capacitor. Can supply 50μA
for external loads.
11
8
ON1
OU T1 ON
OFF
C ontr ol Inp ut. C onnect to AGN D to tur n OU T1 off. C onnect to V
C C
to tur n O U T1 on.
12
11
ON2
OU T2 ON
OFF
C ontr ol Inp ut. C onnect to AGN D to tur n OU T2 off. C onnect to V
C C
to tur n O U T2 on.
13
12
ILIM2
Current-Limit Threshold Adjustment for OUT2. The current-limit threshold at CS2 is 0.1 times the
voltage at ILIM2. Connect a resistor-divider network from REF to set the current-limit threshold
between 25mV and 250mV (with 0.25V to 2.5V at ILIM). Connect to V
CC
to assert 50mV default
current-limit threshold.
14
13
FB2
Feedback Input for OUT2. Connect to GND for 2.5V fixed output, or connect to a resistor-divider
network from OUT2 for an adjustable output between 1V and 5.5V.
15
14
OUT2
Output Voltage Connection for the OUT2 PWM. Connect directly to the junction of the external
inductor and output filter capacitors. OUT2 senses the output voltage to determine the on-time
and also serves as the feedback input in fixed-output modes.
16
15
CS2
Current-Sense Input for OUT2. CS2 is the input to the current-limiting circuitry for valley current
limiting. For lowest cost and highest efficiency, connect to LX2. For highest accuracy, use a sense
resistor. See the
Current-Limit Circuit (ILIM_)
section.
17
16
LX2
External Inductor Connection for OUT2. Connect to the switched side of the inductor. LX2 serves
as the internal lower supply voltage rail for the DH2 high-side gate driver.
18
18
DH2
High-Side Gate Driver Output for OUT2. Swings from LX2 to BST2.
19
19
BST2
Boost Flying Capacitor Connection for OUT2. Connect to an external capacitor and diode
according to the standard application circuit in Figure 1. See
MOSFET Gate Drivers (DH_, DL_)
section.
20
20
DL2
Low-Side Gate-Driver Output for OUT2. DL2 swings from PGND to V
DD
.
21
21
V
DD
Supply Input for the DL Gate Drivers. Connect to system supply voltage, +4.5V to +5.5V. Bypass
to PGND with a low-ESR 4.7μF capacitor.
22
22
V
CC
Analog Supply Input. Connect to system supply voltage, +4.5V to +5.5V, with a 20
series
resistor. Bypass to AGND with a 1μF capacitor.
23
—
GND
Ground. Combined analog and power ground. Serves as negative input for CS_ amplifiers.
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相關(guān)代理商/技術(shù)參數(shù) |
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| MAX1845EEI | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1845EEI+ | 功能描述:電流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1845EEI+T | 功能描述:電流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1845EEI-T | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1845EEI-TG05 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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