MAX6948B MAXIM [Maxim Integrated Products], MAX6948B Datasheet - Page 4

• Manufacturer Part Number: MAX6948B
• Description: High-Efficiency PWM LED Driver with Boost Converter and Five Constant-Current GPIO Ports
• Manufacturer: MAXIM [Maxim Integrated Products]

ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, V+ = 2.7V to 5.0V, V
V+ = 3.3V, V
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
4
BOOST CONVERTER
Undervoltage Lockout Threshold
Undervoltage Lockout Threshold
Hysteresis
Continuous Output Current
Operating Current
LX Current Limit
LX Saturation Voltage
LX Leakage Current
OUT Leakage Current
Operating Frequency
Minimum Duty Cycle
Maximum Duty Cycle
GM Amplifier Transconductance
FB Leakage Current
Feedback Output Voltage
Quick-Start Charge Current
Quick-Start Time
Shutdown Discharge Resistance
Output Current Line Regulation
Thermal Shutdown Threshold
Thermal Shutdown Threshold
Hysteresis
Overvoltage Threshold
Overvoltage Threshold
Hysteresis
SERIAL INTERFACE (SDA, SCL, AD0, RST)
Input High Voltage
Input Low Voltage
Input Leakage Current
Output Low Voltage SDA
Input Capacitance
PARAMETER
DD
= 2.5V, T
A
= +25NC.) (Note 4)
SYMBOL
V
I
f
OUTOFF
R
V
I
I
BOOST
OV_HYS
V
LXOFF
WLED
V
C
COMP
V
UVLO
V
V
V
I
I
I
HYS
IN2
OL2
QS
FB
IH2
OV
IL2
IN2
FB
DD
Half-current setting, V+ = 3.3V, T
V+ rising
V+ falling
100% boost LED PWM, full-current setting,
R
Run bit = 1, boost standby bit = 0, 0%
boost LED PWM
V+ = 3.3V, T
I
0% boost LED PWM, V
V
Continuous conduction mode
Discontinuous conduction mode
V
Full-current setting, V+ = 3.3V, T
Half-current setting
Full-current setting
From enable command STOP condition to
output regulation, C
(Note 7)
3.0V < V+ < 5.0V
V
I
LX
SINK
B
OUT
FB
OUT
= 1.7V to V+, T
= 6.67I, I
= 200mA
= 100mV
= 6mA
= 28V, boost converter in shutdown
Rising
A
WLED
CONDITIONS
= +25°C
A
= V
COMP
= T
LX
FB
MIN
/R
= 10V
= 0.047FF
B
to T
MAX
A
A
= +25°C
= +25°C
, unless otherwise noted. Typical values are at
0.7 x
V
MIN
430
190
175
2.3
94
90
28
DD
±0.01
TYP
0.03
500
250
100
200
100
200
150
150
0.1
3.5
30
30
16
10
95
20
29
10
2
0
2
9
4
MAX
0.3 x
2.65
0.25
V
570
106
210
110
225
0.3
Q1
23
30
DD
2
8
5
UNITS
MHz
%/V
mA
mA
mA
mV
mV
ms
FA
FA
FA
FA
kI
FA
FS
NC
NC
pF
%
%
V
V
V
V
V
V
V