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參數資料
| 型號： | MAX1763EUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85 |
| 中文描述： | 3.4 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, EXPOSED PAD, TSSOP-16 |
| 文件頁數： | 11/16頁 |
| 文件大小： | 456K |
| 代理商： | MAX1763EUE |
within 0.2in (5mm) of the REF pin. REF can source up
to 50μA of external load current.
Gain Block
The MAX1763 gain block can function as a power-OK
comparator or can be used to build a linear regulator
using an external P-channel MOSFET pass device. The
gain-block output is a single-stage transconductance
amplifier that drives an open-drain N-channel MOSFET.
The transconductance (G
M
) of the entire gain-block
stage is 10mS. The internal gain block amplifies the dif-
ference between AIN and the internal 0.938V reference.
To provide a power-OK signal, connect the gain-block
input, AIN, to an external resistor-divider (Figure 3). The
input bias current into AIN is less than 30nA, allowing
large-value divider resistors without sacrificing accura-
cy. Connect the resistor voltage-divider as close to the
IC as possible, within 0.2in (5mm) of AIN. Choose an
R4 value of 270k
or less, then calculate R3 using:
R3 = R4((V
TRIP
/ V
AIN
) - 1)
where V
AIN
is 0.938V.
Figures 4 and 5 show the gain block used in a linear-
regulator application. The output of an external P-chan-
nel pass element is compared to an internal 0.938V
reference. The difference is amplified and drives the
gate of the pass element. Use a logic-level PFET, such
as Fairchild
’
s NDS336P (R
DS(ON)
= 270m
). When the
linear-regulator output voltage is in regulation, the
MOSFET will not be full on; thus, the on-resistance will
not be important. However, if the linear regulator is used
M
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
______________________________________________________________________________________
11
Figure 3. Using the Gain Block as a Power-OK Comparator
Table 3. On/Off Logic Control
ONA
0
ONB
0
MAX1763
On
0
1
Off
1
0
On
1
1
On
MAX1763
POUT
AO
AIN
R6
150k
R3
R4
POWER-OK
OUTPUT
TO V
IN
OR
V
OUT
GND
PGND
AO
POUT
OUT
LX
C1
47
μ
F
BOOST
OUTPUT
C
OUT
47
μ
F
LINEAR-
REGULATED
OUTPUT
R
G
20k
R5
4.7
C2
1.0
μ
F
0.22
μ
F
V
IN
1.8V TO 5.5V
L1
1.5
μ
H
FB
C4
220
μ
F
REF
AIN
R3
R4
R2
30k
SIGNAL
GROUND
POWER
GROUND
R1
MAX1763
ONB
ISET
CLK/SEL
ONA
P
GND
PGND
POUT
OUT
LX
C4
220
μ
F
R5
4.7
C2
1
μ
F
C3
0.22
μ
F
V
IN
1.5
μ
H
FB
C
OUT
47
μ
F
C1
47
μ
F
REF
AIN
R3
165k
R4
100k
MAX1763
ONA
ISET
CLK/SEL
AO
ONB
MBRO520L
3.3V
2.5V
R
G
20k
Figure 4. Using the Gain Block as a Linear Regulator from the
Boosted Output Voltage
Figure 5. Powering a Gain-Block Linear Regulator from the
Input Voltage
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PDF描述 |
|---|---|
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| MAX1765EEE | 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator |
| MAX1765EUE | 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator |
| MAX1812 | Dual USB Switch with Fault Blanking |
| MAX1812EUB | Dual USB Switch with Fault Blanking |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1763EUE+ | 功能描述:直流/直流開關轉換器 1.5A Low-Noise 1MHz Step-Up RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1763EUE+T | 功能描述:直流/直流開關轉換器 1.5A Low-Noise 1MHz Step-Up RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1763EUE+TG069 | 制造商:Maxim Integrated Products 功能描述: |
| MAX1763EUE-T | 功能描述:直流/直流開關轉換器 1.5A Low-Noise 1MHz Step-Up RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1763EUE-TG068 | 制造商:Maxim Integrated Products 功能描述:16 PINS TSSOP PKG - Tape and Reel |
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