MAX1729 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1729

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation

Maxim Integrated 

ECB and LCD Display Bias Supply with Accurate

Output Voltage and Temperature Compensation

ELECTRICAL CHARACTERISTICS

(VIN = +3V, CTLIN = IN, FB = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

CTLIN Low Voltage

CTLIN Bias Current

COMP Impedance

CTLIN Minimum Pulse Width

for Shutdown

SYMBOL

VIL

IIHL

RCOMP

CONDITIONS

VIN = +2.7V to +5.5V

VIN = +5.5V, CTLIN = GND or IN

VFB = 0, Internal Feedback Mode

VFB = +1.25V, External Feedback Mode

tOFF (Note 4)

MIN TYP MAX UNITS

0.4

V

±1

µA

33

kΩ

60

150

Ω

700 1250 2400

µs

CTLIN Minimum Pulse Width

for VOUT Control

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)

tCTLIN

tR/tF VFB = +1.25V

RON ILX = 30mA

ILX(OFF) VLX = 18V

VLX-PS IDIODE = 30mA

K

TA = +25°C

TA = -40°C to +85°C

VIN = +2.7V

VIN = +5.5V

25

ns

20

ns

2.5

5.0

Ω

1.5

0.1

1

µA

700

970

mV

6

8

10

V-µs

5

11

0.4

0.6

1.0

V

Note 1: Specifications to -40°C are guaranteed by design, not production tested.

Note 2: When VIN 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 tOFF, device does not enter shutdown.

Note 5: Switching regulator regulates this voltage to keep LDO from dropping out.

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