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MAX6948B
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
( Typical Application Circuit , V+ = 2.7V to 5.0V, V DD = 1.7V to V+, T A = T MIN to T MAX , unless otherwise noted. Typical values are at
V+ = 3.3V, V DD = 2.5V, T A = +25 N C.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
BOOST CONVERTER
Undervoltage Lockout Threshold
Undervoltage Lockout Threshold
Hysteresis
Continuous Output Current
Operating Current
V UVLO
V HYS
I WLED
V+ rising
V+ falling
100% boost LED PWM, full-current setting,
R B = 6.67 I , I WLED = V FB /R B
Run bit = 1, boost standby bit = 0, 0%
boost LED PWM
2.3
30
30
2.65
2
V
mV
mA
mA
LX Current Limit
LX Saturation Voltage
LX Leakage Current
I LXOFF
V+ = 3.3V, T A = +25°C
I LX = 200mA
0% boost LED PWM, V LX = 10V
430
500
0.1
570
0.25
8
mA
V
F A
OUT Leakage Current
I OUTOFF
V OUT = 28V, boost converter in shutdown
16
23
F A
Operating Frequency
Minimum Duty Cycle
Maximum Duty Cycle
GM Amplifier Transconductance
f BOOST
Continuous conductio n mode
Discontinuous conduction mode
2
10
0
95
250
MHz
%
%
F S
FB Leakage Current
I FB
V FB = 100mV
Half-current setting, V + = 3.3V, T A = +25°C
94
±0.01
100
Q 1
106
F A
Feedback Output Voltage
V FB
Full-current setting, V + = 3.3V, T A = +25°C
Half-current setting
190
90
200
100
210
110
mV
Full-current setting
175
200
225
Quick-Start Charge Current
I QS
150
F A
From enable command STOP condition to
Quick-Start Time
output regulation, C COMP = 0.047 F F
3.5
5
ms
(Note 7)
Shutdown Discharge Resistance
Output Current Line Regulation
Thermal Shutdown Threshold
Thermal Shutdown Threshold
Hysteresis
R COMP
3.0V < V+ < 5.0V
20
2
150
9
k I
%/V
N C
N C
Overvoltage Threshold
V OV
V OUT Rising
28
29
30
V
Overvoltage Threshold
Hysteresis
V OV_HYS
4
V
SERIAL INTERFACE (SDA, SCL, AD0, RST )
Input High Voltage
Input Low Voltage
Input Leakage Current
V IH2
V IL2
I IN2
0.7 x
V DD
0.03
0.3 x
V DD
V
V
F A
Output Low Voltage SDA
Input Capacitance
V OL2
C IN2
I SINK = 6mA
10
0.3
V
pF
4
Maxim Integrated
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