
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
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 0.1 1
µA
PMOS ISOLATION SWITCH (BATT to SW)
PMOS Current Limit V
C C
= 2.5V, V
BATT
= 1.5V 0.65 0.85 1.5 A
PMOS On-Resistance R
DS
ON
V
CC
= 2.5V, V
BATT
= 1.5V, I
SW
= 100mA 0.25 0.4 Ω
Soft-Start Time t
SS
V
CC
= 2.5V, V
BATT
= 1.5V,
R
SW
= 50Ω to GND
0.3 ms
MAX1606
28V Internal Switch LCD Bias Supply
with True Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V
CC
= 3.3V, V
CC
= BATT = SHDN, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.3V, V
CC
= BATT = SHDN, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage V
CC
(Note 1) 2.4 5.5 V
BATT Input Voltage Range V
BATT
(Note 1) 0.8 5.5 V
V
CC
Undervoltage Lockout V
UVLO
V
CC
falling, 30mV typical hysteresis 2.0 2.37 V
V
CC
Quiescent Supply Current I
CC
V
FB
= 1.3V 360 µA
V
CC
Shutdown Supply Current SHDN = GND 1 µA
BATT Input Supply Current I
BATT
V
FB
= 1.3V 40 µA
BATT Shutdown Supply Current SHDN = GND 1 µA
Feedback Set Point V
FB
1.215 1.285 V
Feedback Input Bias Current I
FB
V
FB
= 1.3V 100 nA
INDUCTOR CONNECTIONS (LX, SW)
LX Voltage Range V
LX
28 V
LIM = V
CC
0.35 0.58
LIM = floating 0.18 0.30
LX Switch Current Limit I
LX
MAX
LIM = GND 0.08 0.17
A
LX On-Resistance R
LX
V
CC
= 3.3V, I
LX
= 100mA 2 Ω
LX Leakage Current V
LX
= 28V 2 µA
Maximum LX On-Time t
ON
917µs
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