參數(shù)資料
型號(hào)： MAX1765EUE+
廠商： Maxim Integrated
文件頁(yè)數(shù)： 14/19頁(yè)
文件大?。?/td> 867K
描述： IC REG DL BST/LINEAR 16TSSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 96
拓?fù)洌?/td> 升壓（升壓）同步（1），線性（LDO）（1）
功能： 任何功能
輸出數(shù)： 2
頻率 - 開關(guān)： 1MHz
電壓/電流 - 輸出 1： 2.5 V ~ 5.5 V，800mA
電壓/電流 - 輸出 2： 2.85V/可調(diào)，500mA
帶 LED 驅(qū)動(dòng)器： 無(wú)
帶監(jiān)控器： 無(wú)
帶序列發(fā)生器： 無(wú)
電源電壓： 0.7 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm）裸露焊盤
供應(yīng)商設(shè)備封裝： 16-TSSOP-EP
包裝： 管件
The LDO acts like a switch in this situation and discon-
nects the input from the load. Connect FBL to a resis-
tor-divider from V
REF
to GND (R3 and R4 in Figure 5) so
that V
FBL
= 0.5V (above the Dual Mode" threshold)
when OUTL is regulated, to ensure that the linear regu-
lator is saturated. Another method to configure the
MAX1765 for true shutdown is shown in Figure 6. This
shutdown function is active high and connects to the
gate of a low-impedance PFET and ONB. The PFET
acts like a switch in this situation and disconnects the
input from the load.
Reference
The MAX1765 has an internal 1.25V, 1% reference.
Connect a 0.22礔 ceramic bypass capacitor to GND
within 0.2in (5mm) of the REF pin. REF can source up
to 50礎(chǔ) of external load current. Typically connect ISET
to REF to give the MAX1765 full inductor current limit.
Design Procedure
Setting DC-DC Converter Voltage
Set the output voltage between +2.5V and +5.5V by
connecting a resistor voltage-divider from OUT to FB to
GND (Figure 7). Connect the resistor voltage-divider as
close to the IC as possible, within 0.2in (5mm) of FB.
Choose R2 of 40k﹐r less, then calculate R1 using:
where V
FB
, the boost-regulator feedback set point, is
+1.25V.
For output voltages above 4V, connect a Schottky
diode between LX and POUT to prevent voltage transi-
tion from exceeding the LX voltage rating.
Setting the Linear Regulator Voltage
The LDO regulation voltage can also be set similarly to
the DC-DC converter. Connecting FBL to GND sets the
LDO output to 2.85V. To set other output voltages
between 1.25V and POUT, connect a resistor-divider
from OUTL to FBL to GND (Figure 7). Connect the
resistor voltage-divider as close to the IC as possible,
within 0.2in (5mm) of FBL. The maximum input bias cur-
rent for the FBL input is 50nA. Choose R4 of 40k﹐r
less, then calculate R3 using:
where V
FBL
, the linear regulator feedback set point, is
+1.25V.
Setting the Switch Current
Limit and Soft-Start
The ISET pin adjusts the inductor current limit and
implements soft-start. With ISET connected to REF, the
inductor current limits at 1.25A. With ISET connected to
a resistive divider set from REF to GND, the current limit
is reduced according to:
I    =
LIM
125
2
1    2
. A
R
R   R
SS
SS   SS
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
R   R
V
V
OUTL
FBL
3   4
    
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 - 1
R  R
V
V
OUT
FB
1   2
    
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 - 1
800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
14 ______________________________________________________________________________________
Table 2. Operating Mode Truth Table
OPERATING
MODE
TRACK    ONA    ONB    ONL
LINEAR
REGULATOR
DC-DC
CONVERTER
REF
Shutdown
X
L
H
L
OFF
OFF
OFF
H
H
X
X
Track
H
X
L
X
ON
ON
ON
L
H
X
H
Independent Regulation
L
X
L
H
ON
ON
ON
L
H
X
L
DC-DC Only
L
X
L
L
OFF
ON
ON
LDO Only
X
L
H
H
ON
OFF
ON
Dual Mode is a trademark of Maxim Integrated Products
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MAX1765EUE+ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA Step-Up w/500mA Linear Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1765EUE+T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA Step-Up w/500mA Linear Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1765EUE-T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA Step-Up w/500mA Linear Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1765EVKIT 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Evaluation Kit for the MAX1765 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX176ACPA 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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