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MAX1790 Datasheet(PDF) 4 Page - Maxim Integrated Products

Part No. MAX1790
Description  Low-Noise Step-Up DC-DC Converter
Download  12 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1790 Datasheet(HTML) 4 Page - Maxim Integrated Products

 
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Low-Noise Step-Up DC-DC Converter
4
_______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, VIN = 3.3V, fOSC = 640kHz, TA = +25°C, unless otherwise noted.)
50
1
1000
100
10
EFFICIENCY vs. OUTPUT CURRENT
65
55
85
75
95
70
60
90
80
OUTPUT CURRENT (mA)
fOSC = 1.2MHz
L = 2.7
µH
VIN = 3.3V
VOUT = 5V
fOSC = 640kHz
L = 5.4
µH
50
1
1000
100
10
EFFICIENCY vs. OUTPUT CURRENT
65
55
85
75
95
70
60
90
80
OUTPUT CURRENT (mA)
fOSC = 1.2MHz
L = 5.4
µH
VIN = 3.3V
VOUT = 12V
fOSC = 640kHz
L = 10
µH
OUTPUT CURRENT (mA)
50
1
1000
100
10
EFFICIENCY vs. OUTPUT CURRENT
65
55
85
75
95
70
60
90
80
fOSC = 1.2MHz
L = 5.4
µH
VIN = 5V
VOUT = 12V
fOSC = 640kHz
L = 10
µH
0
0.2
0.1
0.4
0.3
0.6
0.5
0.7
2.5
3.5
4.0
3.0
4.5
5.0
5.5
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
VOUT = 12V
fOSC = 1.2MHz
fOSC = 640kHz
11.60
11.70
11.65
11.80
11.75
11.90
11.85
11.95
12.05
12.00
12.10
0
406080
20
100 120 140
180
160
200
OUTPUT VOLTAGE vs. OUTPUT CURRENT
OUTPUT CURRENT (mA)
fOSC = 640kHz
TA = +85°C
TA = +25°C
TA = -40°C
200mA
10mA
CH1
CH2
CH3
CH1 = LOAD CURRENT, 100mA/div
CH2 = OUTPUT VOLTAGE, AC-COUPLED, 200mV/div
CH3 = INDUCTOR CURRENT, 1A/div
VIN = 3V
VOUT = 12V, fOSC = 640kHz, COUT = 33
µF + 0.1µF
100
µs/div
LOAD-TRANSIENT RESPONSE
RCOMP = 120k
CCOMP = 1200pF
CCOMP2 = 56pF


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