Rainbow Electronics MAX1606 - Manual (Page 4)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V FB > 1.1V 0.75 1.25
Minimum LX Off-Time t OFF
V FB < 0.8V (soft-start) 3.8 6.0
µs
SW Leakage Current SW = GND, V BATT = 5.5V 1 µA
CONTROL INPUTS ( SHDN, LIM)
V IH 2.4V ≤ V
CC
≤ 5.5V
0.8 ×
V CC
SHDN Input Threshold
V IL 2.4V ≤ V
CC
≤ 5.5V
0.2 ×
V CC
V
SHDN Input Bias Current I SHDN V CC = 5.5V, V SHDN = 0 to 5.5V -1 1 µA
LIM Input Low Level 2.4V ≤ V
CC
≤ 5.5V 0.4 V
LIM Input Float Level
2.4V ≤ V
CC
≤ 5.5V,
I LIM = ±0.5µA
( V C C / 2)
- 0.25V
( V C C / 2)
+ 0.25V
V
LIM Input High Level 2.4V ≤ V
CC
≤ 5.5V
V CC
- 0.4V
V
SHDN = V
CC , LIM = GND or V CC -2 2
LIM Input Bias Current I LIM
SHDN = GND 1
µA
PMOS ISOLATION SWITCH (BATT to SW)
PMOS Current Limit V CC = 2.5V, V BATT = 1.5V 0.65 1.5 A
PMOS On-Resistance R DS(ON) V CC = 2.5V, V BATT = 1.5V, I SW = 100mA 0.4 Ω
17.6
17.8
17.7
18.0
17.9
18.1
18.2
2.0 3.5 4.0 2.5 3.0 4.5 5.0 5.5
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX1606 toc01
V CC (V)
OUTPUT VOLTAGE (V)
I OUT = 5mA
I OUT = 1mA
17.6
17.8
17.7
18.0
17.9
18.1
18.2
0 2 3 1 4 5 6
OUTPUT VOLTAGE vs. BATTERY VOLTAGE
MAX1606 toc02
V BATT (V)
OUTPUT VOLTAGE (V)
I OUT = 5mA
I OUT = 1mA
17.6
17.8
17.7
18.0
17.9
18.1
18.2
0 10 5 15 20 25
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1606 toc03
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
LIM = V CC
LIM = GND
LIM = OPEN
Typical Operating Characteristics
(V CC = 3.3V, V BATT = 3.6V, L1 = 10µH, SHDN = LIM = V CC , V OUT(NOM) = 18V (Figure 3), T A = +25°C, unless otherwise noted.)
Note 1: The MAX1606 requires a supply voltage between +2.4V and +5.5V; however, the input voltage (V BATT ) used to power the
inductor can vary from +0.8V to 5.5V.
Note 2: Specifications to -40 °C are guaranteed by design and not production tested.
MAX1606
28V Internal Switch LCD Bias Supply
with True Shutdown
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V CC = 3.3V, V CC = BATT = SHDN, T A = -40°C to +85°C, unless otherwise noted.) (Note 2)