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MAX1790 Datasheet(PDF) 5 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) 5 Page - Maxim Integrated Products

 
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Low-Noise Step-Up DC-DC Converter
_______________________________________________________________________________________
5
2ms/div
STARTUP WAVEFORM WITH
SOFT-START
CH1
CH2
CH3
CH1 = SHDN, 5V/div
CH2 = VOUT, 5V/div
CH3 = INDUCTOR CURRENT, 500mA/div
VOUT = 12V, IOUT = 200mA, fOSC = 640kHz,
CSS = 0.027
µF
CH1
CH2
CH3
CH1 = LX SWITCHING WAVEFORM, 5V/div
CH2 = OUTPUT VOLTAGE, AC-COUPLED, 200mV/div
CH3 = INDUCTOR CURRENT, 1A/div
VOUT = 12V, IOUT = 200mA, fOSC = 640kHz, L = 10
µH;
COUT = 33
µF + 0.1µF
500ns/div
SWITCHING WAVEFORM
0
400
200
800
600
1000
1200
1600
1400
1800
3.0
3.4 3.6 3.8
3.2
4.0 4.2 4.4
4.8
4.6
5.0
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
fOSC = 640kHz
VOUT = 12V
VOUT = 5V
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 3.3V, fOSC = 640kHz, TA = +25°C, unless otherwise noted.)
500mA
20mA
CH1 = LOAD CURRENT, 500mA/div
CH2 = OUTPUT VOLTAGE, AC-COUPLED, 200mV/div
CH3 = INDUCTOR CURRENT, 1A/div
VOUT = 5V, fOSC = 640kHz, COUT = 47
µF + 0.1µF
100
µs/div
LOAD-TRANSIENT RESPONSE
CH1
CH2
CH3
RCOMP = 62k
CCOMP = 820pF
CCOMP2 = 56pF
100
µs/div
STARTUP WAVEFORM WITHOUT
SOFT-START
CH1
CH2
CH3
CH1 = SHDN, 5V/div
CH2 = OUTPUT VOLTAGE, 5V/div
CH3 = INDUCTOR CURRENT, 1A/div
VIN = 3.3V, VOUT = 12V, IOUT = 10mA, fOSC = 640kHz
NO SOFT-START CAPACITOR, COUT = 33
µF
1ms/div
STARTUP WAVEFORM WITH
SOFT-START
CH1
CH2
CH3
CH1 = SHDN, 5V/div
CH2 = OUTPUT VOLTAGE, 5V/div
CH3 = INDUCTOR CURRENT, 200mA/div
VOUT = 12V, IOUT = 10mA, fOSC = 640kHz,
CSS = 0.027
µF, COUT = 33µF


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