MAX1729 Maxim, MAX1729 Datasheet - Page 3

• Manufacturer Part Number: MAX1729
• Description: ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation
• Manufacturer: Maxim

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