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参数资料
| 型号： | MAX1833 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | 数字信号处理 |
| 英文描述： | Replaced by TMS320BC52 : Digital Signal Processors 100-LQFP -40 to 85 |
| 中文描述： | 高效率、升压型转换器，带有反接电池保护 |
| 文件页数： | 9/12页 |
| 文件大小： | 511K |
| 代理商： | MAX1833 |
M
High-Efficiency Step-Up Converters with
Reverse Battery Protection
_______________________________________________________________________________________
9
sometimes cause false shutdowns. To minimize the effect
of ripple, connect a low-value capacitor (C1) from
SHDN
to GND to filter out input noise. Select a C1 value such
that the R4
C1 time constant is above 2ms.
Power-On Reset
The MAX1833/MAX1835 provide a power-on reset out-
put (
RST
). A 100k
to 1M
pullup resistor from
RST
to
OUT provides a logic control signal. This open-drain
output pulls low when the output is 10% below its regu-
lation point. If not used, connect it to GND.
Setting the Output Voltage
The output voltage of the MAX1832/MAX1834 is
adjustable from +2V to +5.5V, using external resistors
R1 and R2 (Figure 1b). Since FB leakage is 20nA
(max), select feedback resistor R1 to be 100k
to
1M
. Calculate R2 as follows:
where V
FB
= 1.228V.
Inductor Selection
The control scheme of the MAX1832
–
MAX1835 permits
flexibility in choosing an inductor. A 10μH inductor per-
forms well for most applications, but values from 4.7μH to
100μH may also be used. Small inductance values typi-
cally offer smaller physical size. Large inductance values
minimize output ripple but reduce output power. Output
power is reduced when the inductance is large enough
to prevent the maximum current limit (525mA) from being
reached before the maximum on-time (5μs) expires.
For maximum output current, choose L such that:
V
s
A
.
0 525
where R
IND
is the inductor series resistance, and R
NCH
is the R
DS(ON)
of the N-channel MOSFET (0.4
typ).
Capacitor Selection
Choose an output capacitor to achieve the desired out-
put ripple percentage.
where r is the desired output ripple in %. A 10μF ceramic
capacitor is a good starting value. The input capacitor
reduces the peak current drawn from the battery and
can be the same value as the input capacitor. A larger
input capacitor can be used to further reduce ripple and
improve efficiency.
PC Board Layout and Grounding
Careful printed circuit layout is important for minimizing
ground bounce and noise. Keep the IC
’
s GND pin and
the ground leads of the input and output filter capaci-
tors less than 0.2in (5mm) apart. In addition, keep all
connections to the FB and LX pins as short as possible.
In particular, when using external feedback resistors,
locate them as close to FB as possible. To maximize
output power and efficiency and minimize output ripple
voltage, use a ground plane and solder the IC
’
s GND
directly to the ground plane.
Chip Information
TRANSISTOR COUNT: 953
PROCESS: BiCMOS
C
L
A
r
V
OUT
OUT
>
×
%
×
×
0 5
.
0 525
.
2
2
I
A
V
A
R
(
R
V
OUT MAX
(
BATT MIN
NCH
IND
OUT
)
(
)
.
.
=
×
+
)
0 525
2
0 525
2
L
V
s
A
BATT MAX
BATT MIN
0 525
(
)
(
.
)
1
(
5
μ
μ
)
<
<
(
)
R
R
V
V
OUT
FB
2
1
1
=
MANUFACTURER
INDUCTOR
PHONE
Coilcraft
DS1608C-103
DO1606T-103
847-639-6400
Sumida
CDRH4D18-100
CR43-100
847-956-0666
Murata
LQH4N100K
814-237-1431
Table 1. Suggested Inductors and
Suppliers
VALUE
(μF)
DESCRIPTION
MANU-
FACTURER
PHONE
594/595 D-
series tantalum
Sprague
603-224-1961
4.7 to
47
TAJ, TPS-
series tantalum
AVX
803-946-0690
4.7 to
10
X7R ceramic
TDK
847-390-4373
4.7 to
22
X7R ceramic
Taiyo Yuden
408-573-4150
Table 2. Suggested Surface-Mount
Capacitors and Manufacturers
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1837 | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| MAX1836EUT33-T | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| MAX1837EUT33-T | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| MAX1836 | Replaced by TMS320BC52 : Digital Signal Processors 100-LQFP |
| MAX1837EUT50 | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1833ETT30 | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY STEP-UP CONVERTER - Rail/Tube |
| MAX1833ETT30+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX1833ETT30+T | 功能描述:直流/直流开关转换器 Step-Up Converter w/Reverse Bat Prtct RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1833ETT30-T | 功能描述:直流/直流开关转换器 Step-Up Converter w/Reverse Bat Prtct RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1833EUT | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY STEP-UP CONVERTER - Rail/Tube |
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