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參數(shù)資料
| 型號(hào)： | MAX849 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Low-Noise, Step-Up DC-DC Converters(高功率，低噪，帶0.5AMOSFET功率開關(guān),步升DC-DC變換器) |
| 中文描述： | 1至3節(jié)電池、大功率、低噪聲、升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大小： | 192K |
| 代理商： | MAX849 |
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M
1-Cell to 3-Cell, High-Power,
Low-Noise, S tep-Up DC-DC Converters
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(V
OUT
= 3.6V, GND = PGND = CLK/SEL = ON1 =
ON2
= AINSEL = AIN1 = AIN2 = FB = POKIN, POUT = OUT,
T
A
= -40°C to +85°C
,
unless otherwise noted.) (Note 9)
PARAMETER
CONDITIONS
REFERENCE
Note 1:
Minimum operating voltage. Because the MAX848/MAX849 are bootstrapped to the output, it will operate down to a 0.7V input.
Note 2:
In low-power mode (CLK/SEL = GND), the output voltage regulates 1% higher than in low-noise mode (CLK/SEL = OUT
or synchronized).
Note 3:
The part is in start-up mode until it reaches this voltage level. Do not apply full-load current.
Note 4:
Load regulation is measured from no load to full load, where full load is determined by the N-channel switch current limit.
Note 5:
Start-up is tested with Figure 2’s circuit. Output current is measured when the input and output voltages are applied.
Note 6:
Supply current from the 3.34V output is measured between the 3.34V output and the OUT pin. This current correlates directly
with actual battery supply current, but is reduced in value according to the step-up ratio and efficiency. V
OUT
= 3.6V to keep
the internal switch open when measuring the current into the device.
Note 7:
When V
CLK/SEL
= 0V, the inductor is forced into constant-peak-current, discontinuous operation. This is guaranteed by
testing in Figure 2’s circuit.
Note 8:
ON1 and
ON2
inputs have approximately 0.15V
OUT
hysteresis.
Note 9:
Specifications to -40°C are guaranteed by design, not production tested.
%
80
90
Oscillator Maximum Duty Cycle
kHz
260
340
CLK/SEL = OUT
Internal Oscillator Frequency
V
1.225
1.275
Rising V
POKIN
External Trip Level
LOGIC CONTROL INPUTS
V
2.95
3.10
Rising V
OUT
, V
POKIN
< 0.1V
Internal Trip Level
% FSR
±4
f
CLK
= 400kHz, 5ms conversion
Accuracy
POWER-GOOD
250
550
MAX849
CLK/SEL = GND (Note 7)
N-Channel Current Limit
120
300
MAX848
MIN
TYP
MAX
UNITS
1100
1800
MAX849
CLK/SEL = OUT
mA
600
1100
MAX848
0.5
CLK/SEL = OUT
P-channel
Switch On-Resistance
0.25
CLK/SEL = OUT
N-channel
I
REF
= 0mA
Reference Output Voltage
DC-DC CONVERTER
1.225
1.275
V
Output Voltage (Note 3)
V
FB
< 0.1V, CLK/SEL = OUT,
includes load-regulation error
3.13
3.47
V
FB Regulation Voltage
Adjustable output, CLK/SEL = OUT
1.21
1.27
V
Output Voltage Lockout Range
OUT Supply Current in Shutdown
(Note 3)
V
ON2
= 3.6V
2.05
2.45
20
V
0.6
CLK/SEL = GND
μA
300
CLK/SEL = OUT, does not include
switching losses
OUT Supply Current in Low-Noise
Mode (Note 6)
μA
90
CLK/SEL = GND
OUT Supply Current in Low-Power
Mode (Note 6)
μA
DC-DC SWITCHES
ADC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX849ESE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-3 Cell Step-Up DC/DC Converter 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 |
| MAX849ESE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-3 Cell Step-Up DC/DC Converter 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 |
| MAX849ESE+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-3 Cell Step-Up DC/DC Converter 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 |
| MAX849ESE-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-3 Cell Step-Up DC/DC Converter 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 |
| MAX849EVKIT | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-Cell to 3-Cell High-Power Low-Noise Step-Up DC-DC Converter 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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