MAX158 Maxim, MAX158 Datasheet - Page 3

• Manufacturer Part Number: MAX158
• Description: High-Efficiency / 26V Step-Up Converter for White LED Main and Subdisplay Backlighting
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V
0°C to +85°C, unless otherwise noted. Typical values are at T
ELECTRICAL CHARACTERISTICS
(V
-40°C to +85°C, unless otherwise noted.) (Notes 1, 3)
Supply Voltage
Undervoltage Lockout (UVLO)
Threshold
Quiescent Current
Overvoltage Lockout (OVLO)
Threshold
OUT1 Input Bias Current
Output Voltage Range
ERROR AMPLIFIER
CTRL to CS Regulation
CTRL Input Resistance
CS to COMP Transconductance
OSCILLATOR
Operating Frequency
N-CHANNEL SWITCH
LX On-Resistance
LX Leakage Current
LX Current Limit
MAIN AND SUBDISPLAY ON/OFF SWITCHES
OUT1 to OUT2 On-Resistance
OUT2 to CS On-Resistance
OUT1 to OUT2 Leakage Current
OUT2 to CS Leakage Current
EN1 and EN2 Logic Input Voltage
High
EN1 and EN2 Logic Input Voltage
Low
EN1 and EN2 Input Leakage
V+
V+
for White LED Main and Subdisplay Backlighting
= +3.0V, V
= +3.0V, V
PARAMETER
PARAMETER
OUT1
OUT1
_______________________________________________________________________________________
= +20V, L1 = 22µH, C
= 20V, L1 = 22µH, C
High-Efficiency, 26V Step-Up Converter
V
Duty cycle = 90%
EN1 = GND, EN2 = V+
EN1 = V+, EN2 = GND
E N 1 = E N 2 = V + , V
EN1 = EN2 = V+, V
+2.6V < V
+2.6V < V
V
V+ rising or falling
No switching, V
Rising
V
(Note 2)
V
0 < V
V
LX
V+
OUT1
CTRL
COMP
= +28V
= V
CTRL
OUT
= +1.0V, V
= +26V, EN1 = EN2 = V+
OUT
= 1.0V
EN1
V+
V+
< +1.0V
= 0.1µF, C
= V
= 0.1µF, C
< +5.5V
< +5.5V
C
EN2
= +0.25V
V+
OU T 1
OUT2
= +5.5V
= +2.6V to +5.5V
CONDITIONS
CONDITIONS
COMP
COMP
= 25V , V
A
= 12V, V
= +25°C.) (Note 1)
= 0.022µF, R
= 0.022µF, R
OU T 2
CS
= 0, T
= + 9V , T
SENSE
A
SENSE
T
T
T
T
= +85°C
A
A
A
A
A
= +25°C
= +85°C
= +25°C
= +85°C
= + 85° C
= 7.5Ω, V
= 7.5Ω, V
CTRL
CTRL
V
(V
0.093
DIODE
MIN
2.10
0.75
MIN
450
290
1.6
2.6
26
20
32
V+
= +1.5V, EN1 = EN2 = V+, T
= +1.5V, EN1 = EN2 = V+, T
-
)
TYP
1.50
0.01
0.02
0.05
0.05
0.02
650
2.5
2.5
0.1
0.107
MAX
MAX
2.25
2.55
0.56
25.5
1.30
950
780
0.6
5.5
29
65
85
5
1
UNITS
UNITS
MHz
mA
mA
kΩ
µA
µA
µA
µA
µA
µS
Ω
Ω
Ω
V
V
V
V
V
V
V
A
A
3
=
=