MAX1747
Triple Charge-Pump TFT LCD
DC-DC Converter
4 _______________________________________________________________________________________
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
Input Supply Range V
IN
2.7 4.5 V
Input Undervoltage Threshold V
UVLO
V
IN
falling, 40mV hysteresis (typ) 2.2 2.6 V
Input Quiescent Supply
Current
I
IN
+
I
SUPM
V
FB
= V
FBP
= 1.5V, V
FBN
= -0.2V, V
OUT
= 5V,
no load on DRVN and DRVP; CXN and
CXP open
1.0 mA
Output Quiescent Supply
Current
I
Q(OUT)
V
FB
= V
FBP
= 1.5V, V
FBN
= -0.2V, V
OUT
= 5V,
no load on DRVN and DRVP; CXN and
CXP open
4.0 mA
Input Shutdown Current V
SHDN
= 0, V
SUPM
= 5V 20 µA
Operating Frequency f
OSC
I
SHDN
= 22µA 0.65 1.2 MHz
MAIN CHARGE PUMP
Output Voltage Range V
OUT
4.5 5.5 V
Output Current I
OU T
M AX
C
X
= 0.47µF 200 mA
FB Regulation Voltage V
FB
1.222 1.271 V
FB Input Bias Current I
FB
V
FB
= 1.25V -50 +50 nA
FB Power-Ready Trip Level Rising edge 1.09 1.16 V
NEGATIVE LOW-POWER CHARGE PUMP
SUPN Input Supply Range V
SUPN
2.7 13 V
SUPN Quiescent Current I
SUPN
V
FBN
= -0.2V, no load on DRVN 0.8 mA
SUPN Shutdown Current V
SHDN
= 0, V
SUPN
= 13V 10 µA
FBN Regulation Voltage V
FBN
-50 +50 mV
FBN Input Bias Current I
FBN
V
FBN
= 0 -50 +50 nA
DRVN PCH On-Resistance 6 Ω
V
FBN
= 50mV 5 Ω
DRVN NCH On-Resistance
V
FBN
= -50mV 20 kΩ
FBN Power-Ready Trip Level Falling edge 80 165 mV
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 0.8 mA
SUPP Shutdown Current V
SHDN
= 0, V
SUPP
= 13V 10 µA
FBP Regulation Voltage V
FBP
1.20 1.30 V
FBP Input Bias Current I
FBP
V
FBP
= 1.5V -50 +50 nA
DRVP PCH On-Resistance 6 Ω
V
FBP
= 1.20V 5 Ω
DRVP NCH On-Resistance
V
FBP
= 1.30V 20 kΩ
FBP Power-Ready Trip Level Rising edge 1.09 1.16 V
ELECTRICAL CHARACTERISTICS
(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
= -40°C to +85°C, unless otherwise noted.) (Note 1)
