Datasheet

MAX8662/MAX8663
Power-Management ICs for
Single-Cell, Li+ Battery-Operated Devices
_____________________________________________________________________________________ 13
OUT2 ENABLE AND DISABLE RESPONSE
MAX8662 toc38
200mA/div
1V/div
2V/div
400µs/div
V
CEN
= V
L
R
OUT2
= 33I
V
EN2
I
DC
V
OUT2
LED CURRENT
vs. PWM DIMMING DUTY CYCLE
MAX8662/63 toc39
DUTY CYCLE (%)
LED CURRENT (mA)
80604020
1.0
0.5
2.0
1.5
2.5
3.5
3.0
4.5
4.0
5.0
0
09070503010 100
V
BAT
= 3.6V
V
BRT
= 0.25V
f = 1kHz
LED CURRENT vs. BRT VOLTAGE
MAX8662/63 toc40
BRT VOLTAGE (V)
LED CURRENT (mA)
1.20.90.60.3
5
10
15
20
25
30
0
01.5
V
BAT
= 3.6V
OUT4 REGULATOR LOAD REGULATION
MAX8662/63 toc44
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
400300200100
3.285
3.290
3.295
3.300
3.305
3.310
3.315
3.280
0 500
V
IN
= 5.5V
V
IN
= 3.6V
OUT4 REGULATOR LINE REGULATION
MAX8662/63 toc45
V
IN_OUT4
(V)
OUTPUT VOLTAGE (V)
5432
1.8
2.2
3.0
2.6
3.4
1.4
16
R
LOAD
= 330Ω
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
DC
= 5V, R
PSET
= 1.5kΩ, R
ISET
= 3kΩ, V
OUT1
= 3.3V, V
OUT2
= 1.3V, SL1 = SL2 = open, V
CEN
= 0V, V
PEN1
=
V
PEN2
= 5V, C
OUT1
= 2 x 10µF, C
OUT2
= 2 x 10µF, C
OUT3
= 0.1µF, C
OUT4
= 4.7µF, C
OUT5
= 1µF, C
OUT6
= 2.2µF, C
OUT7
= 1µF, CT =
0.068µF, C
REF
= C
VL
= 0.1µF, R
THM
= 10kΩ, L1 = 3.3µH, L2 = 4.7µH, L3 = 22µH, V
GND
= V
PG1
= V
PG2
= V
PG3
= 0V, T
A
= +25°C,
unless otherwise noted.)
OUT4 VOLTAGE vs. TEMPERATURE
MAX8662/63 toc46
AMBIENT TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
603510-15
3.309
3.311
3.313
3.315
3.305
3.307
-40 85
V
BAT
= 4.0V
R
LOAD
= 330Ω
OUT3 SWITCHING WAVEFORMS
MAX8662/63 toc41
1µs/div
V
OUT3
AC-COUPLED
I
L
V
LX
100mA/div
200mV/div
10V/div
I
OUT3
= 1mA
OUT3 ENABLE AND DISABLE RESPONSE
MAX8662 toc42
200mA/div
10V/div
2V/div
4ms/div
COMPENSATION
AT CC3 = 1kI
IN SERIES WITH 0.22µF
V
EN3
I
DC
V
OUT3
V
CEN
= V
L
OUT3 LOAD = 7 WLEDs
I
LED
= 30mA
V
BAT
= 4.0V
4.0V
OUT3 REGULATOR EFFICIENCY
vs. LOAD CURRENT
MAX8662/63 toc43
LOAD CURRENT (mA)
OUT2 REGULATOR EFFICIENCY (%)
20
10
40
30
50
70
60
90
80
100
0
0.1 101 100
V
SYS
= 4.2V
V
SYS
= 3.6V
V
SYS
= 5.5V