參數(shù)資料
型號： MAX1556ETB
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： 16レA IQ, 1.2A PWM Step-Down DC-DC Converters
中文描述： 2.25 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, DSO10
封裝： 3 X 3 MM, 0.80 MM HEIGHT, MO-229WEED-3, TDFN-10
文件頁數(shù)： 9/12頁
文件大?。?/td> 732K
代理商： MAX1556ETB
M
16μA I
Q
, 1.2A PWM DC-DC
Step-Down Converters
_______________________________________________________________________________________
9
(R
DS(ON)P
) is given in the
Electrical Characteristics
. DCR
for a few recommended inductors is listed in Table 2.
Soft-Start
The MAX1556/MAX1557 use soft-start to eliminate
inrush current during startup, reducing transients at the
input source. Soft-start is particularly useful for higher-
impedance input sources such as Li+ and alkaline
cells. Connect the required soft-start capacitor from SS
to GND. For most applications using a 22μF output
capacitor, connect a 1000pF capacitor from SS to
GND. If a larger output capacitor is used, then use the
following formula to find the value of the soft-start
capacitor:
Soft-start is implemented by exponentially ramping up
the output voltage from 0 to V
OUT(NOM)
with a time con-
stant equal to C
SS
times 200k
(see the
Typical
Operating Characteristics
). Assuming three time con-
stants to full output voltage, use the following formula to
calculate the soft-start time:
Shutdown Mode
Connecting
SHDN
to GND or logic low places the
MAX1556/MAX1557 in shutdown mode and reduces
supply current to 0.1μA. In shutdown, the control cir-
cuitry and the internal p-channel and n-channel
MOSFETs turn off and LX becomes high impedance.
Connect
SHDN
to IN or logic high for normal operation.
Thermal Shutdown
As soon as the junction temperature of the
MAX1556/MAX1557 exceeds +160°C, the ICs go into
thermal shutdown. In this mode the internal p-channel
switch and the internal n-channel synchronous rectifier
are turned off. The device resumes normal operation
when the junction temperature falls below +145°C.
Applications Information
The MAX1556/MAX1557 are optimized for use with small
external components. The correct selection of inductors
and input and output capacitors ensures high efficiency,
low output ripple, and fast transient response.
Adjusting the Output Voltage
The adjustable output is selected when D1 = D2 = 0
and an external resistor-divider is used to set the output
voltage (see Figure 6). The MAX1556/MAX1557 have a
defined line- and load-regulation slope. The load regu-
lation is for both preset and adjustable outputs and is
described in the
Electrical Characteristics
table and
Figures 4 and 5. The impact of the line-regulation slope
can be reduced by applying a correction factor to the
feedback resistor equation.
First, calculate the correction factor, k, by plugging the
desired output voltage into the following formula:
k represents the shift in the operating point at the feed-
back node (OUT).
Select the lower feedback resistor, R3, to be
≤
35.7k
to
ensure stability and solve for R2:
0 75
.
V
OUTPUT
3
+
3
2
V k
R
R
(
R
=
)
k
x
V x
V
V
V
OUTPUT
1 06
.
.
=
10
0 75
3 6
2
t
x
x C
SS
SS
=
600
10
3
C
C
22000
SS
OUT
=
Table 2. Inductor Selection
MANUFACTURER
Taiyo Yuden
Taiyo Yuden
TOKO
TOKO
Sumida
TOKO
Murata
Sumitomo
Sumitomo
PART
VALUE (μH)
3.3
4.7
3.5
4.7
4.7
4.7
4.7
4.7
4.7
DCR (m
)
36
50
73
87
50
100*
97
70*
100*
I
SAT
(mA)
1300
1200
1340
1140
1200
1200*
790
1000*
800*
SIZE (mm)
5 x 5 x 2.0
5 x 5 x 2.0
5 x 5 x 2.0
5 x 5 x 2.0
3.8 x 3.8 x 1.8
4.8 x 4.8 x 1.2
2.5 x 3.2 x 2.0
3.0 x 3.2 x 1.7
SHIELDED
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
LMNP04SB3R3N
LMNP04SB4R7N
D52LC
D52LC
CDRH3D16
D412F
LQH32CN
CXL180
CXLD140
*
Estimated based upon similar-valued prototype inductors.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1556ETB/V+T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 16uA IQ 1.2A PWM Step-Down 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
MAX1556ETB+ 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP DOWN 10TDFN EP - Rail/Tube 制造商:Maxim Integrated Products 功能描述:16MICROAMP QUIESCENT CURRENT, 1.2A PWM S
MAX1556ETB+T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 16uA IQ 1.2A PWM Step-Down 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
MAX1556ETB+TG40 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 16 A IQ 1.2A PWM Step-Down DC-DC Converters 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
MAX1556ETB-T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 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
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