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MAX1561 Fiches technique(PDF) 3 Page - Maxim Integrated Products

No de pièce MAX1561
Description  High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
Download  10 Pages
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1561 Fiches technique(HTML) 3 Page - Maxim Integrated Products

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High-Efficiency, 26V Step-Up Converters
for Two to Six White LEDs
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3V, VOUT = 20V, COUT = 0.1µF, CCOMP = 0.15µF, RSENSE = 7.5
Ω, VCTRL = 1.5V, Figure 1, TA = 0°C to +85°C, unless other-
wise noted. Typical values are at TA = +25°C.)
Note 1: VD1 is the diode forward-voltage drop of diode D1 in Figure 1.
Note 2: Time from CTRL going below the dual-mode threshold to IC shutdown.
Note 3: Specifications to -40°C are guaranteed by design and not production tested.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
N-CHANNEL SWITCH
LX On-Resistance
ILX = 190mA
1.45
2.25
TA = +25
°C
0.01
5
LX Leakage Current
VLX = 28V, CTRL = GND
TA = +85
°C1
µA
LX Current Limit
Duty cycle = 90%
450
700
950
mA
ELECTRICAL CHARACTERISTICS
(VIN = 3V, VOUT = 20V, COUT = 0.1µF, CCOMP = 0.15µF, RSENSE = 7.5
Ω, VCTRL = 1.5V, Figure 1, TA = -40°C to +85°C, unless other-
wise noted.) (Note 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
2.6
5.5
V
UVLO Threshold
VIN rising or falling
2.10
2.55
V
Quiescent Current
No switching
0.55
mA
OVLO Threshold
VOUT rising
26
29
V
VOUT = 26V, VCTRL > 0.24V
10
30
OUT Input Bias Current
VOUT = VIN, CTRL = GND
1
µA
Output Voltage Range
(Note 1)
(VIN - VD1)
25.5
V
ERROR AMPLIFIER
CTRL to CS Regulation
VCTRL = 1V, VIN = 2.6V to 5.5V
0.093
0.107
V
CTRL Input Resistance
VCTRL
≤ 1.0V
240
780
k
CTRL Dual-Mode Threshold
100
240
mV
MAX1561
6
11
CTRL Shutdown Enable Delay
(Note 2)
MAX1599
13
22
ms
CS-to-COMP Transconductance
VCOMP = 1.0V
32
85
µS
OSCILLATOR
MAX1561
0.75
1.25
Operating Frequency
MAX1599
0.37
0.63
MHz
Maximum Duty Cycle
CTRL = IN, CS = GND
91
%
N-CHANNEL SWITCH
LX On-Resistance
2.25
LX Current Limit
Duty cycle = 90%
450
950
mA


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