參數(shù)資料
型號(hào)： MAX1549ETL+
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： Dual, Interleaved, Fixed-Frequency Step-Down Controller with a Dynamically Adjustable Output
中文描述： DUAL SWITCHING CONTROLLER, 450 kHz SWITCHING FREQ-MAX, PQCC40
封裝： 6 X 6 MM, 0.8 MM HEIGHT, MO220WJJD-2, QFN-40
文件頁(yè)數(shù)： 3/35頁(yè)
文件大小： 504K
代理商： MAX1549ETL+
MAX1549
Dual, Interleaved, Fixed-Frequency Step-Down
Controller with a Dynamically Adjustable Output
______________________________________________________________________________________
11
Pin Description
PIN
NAME
FUNCTION
1
GND
Analog Ground. Connect backside pad to GND.
2, 20,
25, 31
N.C.
Not Internally Connected
3
REF
2.0V Reference Voltage Output. Bypass to analog ground with a 0.1F or greater ceramic capacitor. The
reference can source up to 100A for external loads. Loading REF degrades output voltage accuracy
according to the REF load-regulation error. The reference shuts down when both MAX1549 outputs are
disabled.
4VCC
Analog Supply Input. Connect to the system supply voltage (+4.5V to +5.5V) through a series 20
resistor. Bypass VCC to analog ground with a 1F or greater ceramic capacitor.
5
CC1
Integrator Capacitor Connection. Connect a 47pF to 1000pF (470pF typ) capacitor from CC1 to analog
ground (GND) to set the integration time constant for the main MAX1549 controller (OUT1).
6
ILIM1
Current-Limit Threshold Adjustment for Controller 1. The current-limit threshold defaults to 70mV if ILIM1
is connected to VCC. In adjustable mode, the current-limit threshold across CSH1 and CSL1 is precisely
1/10th the voltage seen at ILIM1 over a 0.5V to 2.0V range. The logic threshold for switchover to the
70mV default value is approximately VCC - 1V.
7
ILIM2
Current-Limit Threshold Adjustment for Controller 2. The current-limit threshold defaults to 70mV if ILIM2
is connected to VCC. In adjustable mode, the current-limit threshold across CSH2 and CSL2 is precisely
1/10th the voltage seen at ILIM2 over a 0.5V to 2.0V range. The logic threshold for switchover to the
70mV default value is approximately VCC - 1V.
8, 9
G0, G1
Buffered N-Channel MOSFET Gate Inputs. See Table 4.
10
FBLANK
Fault-Blanking Select Input. This four-level logic input enables or disables fault blanking and sets the
minimum forced-PWM operation time (tFBLANK). When fault blanking is enabled, the MAX1549 blanks
the PGOOD1 output and main (OUT1) controller’s OVP/UVP fault protection for the selected time period
after the controller detects a transition on G0 or G1. Additionally, the main controller enters forced-PWM
mode for the duration of tFBLANK anytime G0 or G1 changes states.
OUT1 fault protection and PGOOD1 blanking:
VCC = 150s, open = 100s, REF = 50s, GND = blanking disabled
Automatic forced-PWM transition operation (OUT1 only):
VCC = 150s, open = 100s, REF = 50s, GND = 100s
11
FSEL
Frequency-Select Input. This four-level logic input sets the controller’s switching frequency. Connect to
GND, REF, VCC, or leave FSEL unconnected (open) to select the following typical switching frequencies:
VCC = 400kHz, open = 300kHz, REF = 200kHz, GND = 100kHz
12
ON1
OUT1 Enable Input. Pull to GND to shut down controller 1 (OUT1). Connect to VCC for normal operation.
The output is discharged through a 12
resistor between OUT1 and GND, and DL1 is forced high after
VOUT1 drops below 0.3V. A rising edge on ON1 or ON2 clears the fault-protection latch.
13
ON2
OUT2 Enable Input. Pull to GND to shut down controller 2 (OUT2). Connect to VCC for normal operation.
The output is discharged through a 12
resistor between OUT2 and GND, and DL2 is forced high after
VOUT2 drops below 0.3V. A rising edge on ON1 or ON2 clears the fault-protection latch.
14
CSH2
Positive Current-Sense Input for Controller 2. Connect to the positive terminal of the current-sense
element. Figure 8 describes current-sensing options. The PWM controller does not begin a cycle unless
the current sensed is less than the current-limit threshold programmed at ILIM2.
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MAX1549ETL+ 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
MAX1549ETL+T 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
MAX1549ETL-T 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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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