Electrical characteristics – Rainbow Electronics MAX1729 User Manual
Page 3
MAX1729
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
_______________________________________________________________________________________
3
Note 1:
Specifications to -40°C are guaranteed by design, not production tested.
Note 2:
When V
IN
is below this level, the boost and LDO outputs are disabled.
Note 3:
Guaranteed by design.
Note 4:
Minimum time to hold CTLIN low to invoke shutdown. If CTLIN is held low for less than t
OFF
, device does not enter shutdown.
Note 5:
Switching regulator regulates this voltage to keep LDO from dropping out.
ELECTRICAL CHARACTERISTICS
(V
IN
= +3V, CTLIN = IN, FB = GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
V
FB
= 0, Internal Feedback Mode
V
0.4
0.6
1.0
V
IN
= +5.5V, CTLIN = GND or IN
V
IN
= +2.7V to +5.5V
PS to OUT Voltage (Note 5)
T
A
= +25°C
I
DIODE
= 30mA
(Note 4)
I
LX
= 30mA
ns
25
CONDITIONS
5
11
V-µs
6
8
10
K
PFM On-Time Constant
t
CTLIN
CTLIN Minimum Pulse Width
for V
OUT
Control
V
FB
= +1.25V
ns
Ω
60
150
R
COMP
COMP Impedance
µA
±1
I
IHL
V
0.4
V
IL
CTLIN Low Voltage
CTLIN Bias Current
20
t
R
/t
F
COMP Rise/Fall Time
V
IN
= +5.5V
1.5
mV
700
970
V
LX-PS
LX to PS Diode Forward
Voltage
µs
700
1250
2400
t
OFF
CTLIN Minimum Pulse Width
for Shutdown
Ω
2.5
5.0
R
ON
Switch On-Resistance
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
IN
= +2.7V
V
LX
= 18V
µA
0.1
1
I
LX(OFF)
Switch Off-Leakage Current
V
FB =
+1.25V, External Feedback Mode
33
k
Ω
T
A
= -40°C to +85°C