Datasheet

ELECTRICAL CHARACTERISTICS (Output Regulator) (continued)
(V
SYS_
= V
PV_
= V
IN45
= V
IN67
= 4.0V, V
BRT
= 1.25V, circuit of Figure 1, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= +25°C
0.01
1
OVP Leakage Current
V
EN3
= 0V,
V
OVP
= V
SYS
= 5.5V
T
A
= +85°C
0.1
µA
nMOS On-Resistance I
LX3
= 100mA
0.6
1.2 Ω
T
A
= +25°C
0.01 5.00
nMOS Off-Leakage Current
V
LX3
= 30V
T
A
= +85°C
0.1
µA
nMOS Current Limit
500 620 900
mA
LED DRIVER
BRT Input Range V
BRT
I
CS
= 0 to 30mA 0 1.5 V
REF Voltage V
REF
I
REF
= 0mA
1.45 1.50 1.55
V
T
A
= +25°C -1
-0.01
+1
BRT Input Current V
BRT
= 0 to 1.5V
T
A
= +85°C
0.1
µA
V
BRT
= 1.5V
28
30 32
CS Sink Current V
CS
= 0.2V
V
BRT
= 50mV
0.4 0.8
1.2
mA
CS Current-Source
Line Regulation
V
SYS
= 2.7V to 5.5V
0.1
%/V
PWM DIMMING
EN3 DC Turn-On Delay From V
EN3
= high to LED on
1.5 2.0
2.5 ms
EN3 Shutdown Delay From V
EN3
= low to LED off
1.5 2.0
2.5 ms
Maximum
1.5 2.0
ms
PWM Dimming Capture
Period
Time between rising edges
on EN3 for PWM dimming to
become active
Minimum 8 10 µs
PWM Dimming Pulse-Width
Resolution
Resolution of high or low-pulse width on EN3 for
dimming change
0.5
µs
LINEAR REGULATORS
IN 45, IN 67 O p er ati ng Rang e
V
IN45
1.7
5.5 V
IN45, IN67 Undervoltage
Threshold
V
UVLO-IN45
V
IN45
rising, 100mV hysteresis
1.5 1.6
1.7 V
Output Noise f = 100Hz to 100kHz
200
µV
RMS
PSRR f = 100kHz 30 dB
Shutdown Supply Current V
EN4
= V
EN5
= 0V, T
A
= +25°C
0.001
1µA
Soft-Start Ramp Time V
OUT4
to 90% of final value 34
V/ms
Output Discharge
Resistance in Shutdown
V
EN4
= 0V
0.5 1.0
2.0 kΩ
LINEAR REGULATOR 4 (LDO4)
Supply Current At IN45, V
EN5
= 0V I
OUT4
= 0A 20 30 µA
Voltage Accuracy
I
OUT4
= 0 to 500mA,
V
IN45
= V
OUT4
+ 0.3V to 5.5V with 1.7V (min)
-1.5 +1.5
%
M i ni m um O utp ut C ap aci tor C
OUT4
Guaranteed stability, ESR < 0.05Ω
3.76
µF
Dropout Resistance IN45 to OUT4
0.2
0.4 Ω
Current Limit V
OUT4
= 0V
500 700
mA
MAX8662/MAX8663
Power-Management ICs for
Single-Cell, Li+ Battery-Operated Devices
6 _______________________________________________________________________________________