MAX8648 Maxim Integrated Products, MAX8648 Datasheet - Page 4

• Manufacturer Part Number: MAX8648
• Description: (MAX8647 / MAX8648) Ultra-Efficient Charge Pumps
• Manufacturer: Maxim Integrated Products

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Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(V
(V
4
Note 1: Limits are 100% production tested at T
Note 2: Guaranteed by design.
Note 3: LED dropout voltage is defined as the LED_ to GND voltage at which current into LED_ drops 10% from the value at V
Derating-Function Start Temperature
Derating-Function Slope
LED_ R
LED_ Dropout
LED_ Current Regulator Switchover
Threshold (Inactive to Active)
LED_ Current Regulator Switchover
Hysteresis
LED_ Leakage in Shutdown
VDD
IN
100
90
80
70
60
50
40
30
20
10
_______________________________________________________________________________________
= 3.6V, V
0
2.7
= V
DSON
1.6mA/LED
EFFICIENCY vs. SUPPLY VOLTAGE
IN
(DRIVING SIX MATCHED LEDs)
= 3.6V, V
3.0
PARAMETER
EN_
INPUT VOLTAGE (V)
= V
6.4mA/LED
3.3
IN
GND
16mA/LED
, circuit of Figure 1, T
3.6
= 0V, T
20.8mA/LED
3.9
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
4.2
From derating-function start temperature
Not utilizing the charge pump
Utilizing the charge pump
24mA setting
(Note 3)
V
All LEDs off
LED_
A
A
= +25°C, unless otherwise noted.)
= +25°C. Specifications over the operating temperature range are guaranteed by design.
falling
100
90
80
70
60
50
40
4.2
EFFICIENCY vs. Li+ BATTERY VOLTAGE
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
3.9
1.6mA/LED
(DRIVING SIX MATCHED LEDs)
3.8
CONDITIONS
Not utilizing the charge pump
Utilizing the charge pump
20.8mA/LED
3.7
16mA/LED
Typical Operating Characteristics
3.6
6.4mA/LED
T
T
A
A
3.5
= +25°C
= +85°C
3.4
3.0
100
90
80
70
60
50
40
30
20
10
0
2.7
MIN
125
LEDs HAVE MISMATCHED V
1.6mA/LED
EFFICIENCY vs. SUPPLY VOLTAGE
A
3.0
= +25°C.) (Note 1)
(DRIVING SIX LEDs)
INPUT VOLTAGE (V)
TYP
0.01
+60
-2.5
150
100
0.1
60
90
3
4
3.3
16mA/LED
3.6
MAX
F
120
200
175
5
LED_
3.9
UNITS
%/°C
mV
mV
mV
= 0.5V.
µA
°C
Ω
4.2