Manual

MAX1747
Triple Charge-Pump TFT LCD
DC-DC Converter
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
SUPM
= +3.0V, V
SUPP
= V
SUPN
= +5V, TGND = PGND = GND, I
SHDN
= 22µA, C
OUT
= 2
✕
4.7µF, C
REF
= 0.22µF, C
INTG
=
1500pF, V
OUT
= +5V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX U N IT S
FBN Input Bias Current I
FBN
V
FBN
= -50mV -50 +50 nA
DRVN PCH On-Resistance 36Ω
V
FBN
= 50mV 1 5 Ω
DRVN NCH On-Resistance
V
FBN
= -50mV 20 kΩ
FBN Power-Ready Trip Level Falling edge 80 125 165 mV
FBN Fault Trip Level Rising edge 140 mV
Negative Soft-Start Period
2.048/
F
OSC
s
POSITIVE LOW-POWER CHARGE PUMP
SUPP Input Supply Range V
SUPP
2.7 13 V
SUPP Quiescent Current I
SUPP
V
FBP
= 1.5V, no load on DRVP 0.6 0.8 mA
SUPP Shutdown Current V
SHDN
= 0, V
SUPP
= 13V 0.1 10 µA
FBP Regulation Voltage V
FBP
1.20 1.25 1.30 V
FBP Input Bias Current I
FBP
V
FBP
= 1.5V -50 +50 nA
DRVP PCH On-Resistance 36Ω
V
FBP
= 1.20V 1.5 5 Ω
DRVP NCH On-Resistance
V
FBP
= 1.30V 20 kΩ
FBP Power-Ready Trip Level Rising edge 1.090 1.125 1.160 V
FBP Fault Trip Level Falling edge 1.100 V
Positive Soft-Start Period
2.048/
F
OSC
s
REFERENCE
Reference Voltage V
REF
-2µA < I
REF
< 50µA 1.231 1.25 1.269 V
Reference Undervoltage
Threshold
V
REF
rising 0.95 1.05 1.18 V
LOGIC SIGNALS
SHDN Input Low Voltage 0.4 V
SHDN Bias Voltage I
SHDN
= 22µA 580 724 830 mV
SHDN Bias Voltage Tempco 2 mV/°C
SHDN Input Current Range I
SHDN
For 200kHz to 2MHz operation 3 65 µA
RDY Output Low Voltage I
SINK
= 2mA 0.25 0.5 V
RDY Output High Leakage V
RDY
= 13V 0.01 1 µA