MAX1570 Datasheet, PDF (3/11 Pages) Maxim Integrated Products – White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump

White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
ELECTRICAL CHARACTERISTICS (continued)
(V_IN = 3.6V, GND = PGND = 0, EN1 = EN2 = IN, C_IN = C1 = C2 = 1µF, C_OUT = 4.7µF, T_A = 0°C to +85°C, unless otherwise noted.
Typical values are at T_A = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
LED1 Dual Mode™ Threshold
50
75
100
mV
Thermal-Shutdown Threshold
160
°C
Thermal-Shutdown Hysteresis
20
°C
ELECTRICAL CHARACTERISTICS
(V_IN = 3.6V, GND = PGND = 0, EN1 = EN2 = IN, C_IN = C1 = C2 = 1µF, C_OUT = 4.7µF, T_A = -40°C to +85°C, unless otherwise noted.)
(Note 3)
PARAMETER
IN Operating Voltage
Undervoltage Lockout Threshold
Supply Current
Shutdown Supply Current
SET Bias Voltage
SET Leakage in Shutdown
SET Current Range
SET to LED_ Current Ratio
LED_ to LED_ Current Matching
Maximum LED_ Sink Current
LED_ Dropout Voltage
LED1 Regulation Voltage
(1.5x Mode)
LED Leakage in Shutdown
Maximum OUT Current
Open-Loop OUT Resistance
EN1, EN2 High Voltage
EN1, EN2 Low Voltage
EN1, EN2 Input Current
LED1 Dual Mode Threshold
CONDITIONS
V_IN rising or falling
1MHz switching, no load
EN1 = EN2 = GND
EN1 = GND, EN2 = IN, I_SET = 33µA
EN1 = IN, EN2 = GND, I_SET = 67µA
EN1 = IN, EN2 = IN, I_SET = 100µA
EN1 = EN2 = GND, V_IN = 5.5V, V_SET = 0 or 5.5V
I_LED/I_SET, I_SET = 67µA, V_{LED_}= 1V
I_SET = 67µA, V_{LED_}= 1V
I_SET = 130µA, V_{LED_}= 1V
I_SET = 33µA (Note 1)
I_SET = 67µA (Note 2)
I_SET = 100µA (Note 2)
EN1 = GND, EN2 = IN, I_SET = 33µA
EN1 = IN, EN2 = GND, I_SET = 67µA
EN1 = IN, EN2 = IN, I_SET = 100µA
EN1 = GND, EN2 = GND, V_{LED_}= 5.5V
IN ≥ 3.4V, OUT ≥ 3.9V
1x mode (V_IN - V_OUT)/I_OUT
1.5x mode (1.5V_IN - V_OUT)/I_OUT
IN = 2.7V to 5.5V
IN = 2.7V to 5.5V
EN_ = GND or 5.5V
MIN
2.7
2.25
0.190
0.380
0.570
20
215
-3
28
185
277
360
150
1.6
50
MAX
5.5
2.60
3.5
5
0.210
0.420
0.630
1
130
250
+3
180
360
410
215
323
440
1
1.75
8
0.4
1
100
UNITS
V
V
mA
µA
V
µA
µA
A/A
%
mA
mV
mV
µA
mA
Ω
V
V
µA
mV
Note 1: Dropout voltage is defined as the LED_ to GND voltage at which current sink into LED_ drops 20% from the value at LED_ = 1V.
Note 2: Dropout voltage is defined as the LED_ to GND voltage at which current sink into LED_ drops 10% from the value at LED_ = 1V.
Note 3: Specifications to -40°C are guaranteed by design and not production tested.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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