Datasheet

MAX8795A
TFT-LCD DC-DC Converter with
Operational Amplifiers
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3V, V
MAIN
= V
SUP
= 14V, V
PGND
= V
AGND
= V
BGND
= 0V, I
REF
= 25µA, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
GATE-OFF LINEAR-REGULATOR CONTROLLER
FBN Regulation Voltage V
FBN
I
DRVN
= 100µA, V
REF
- V
FBN
0.972 1.022 V
FBN Effective Load-Regulation
Error (Transconductance)
V
DRVN
= -10V, I
DRVN
= 50µA to 1mA 25 mV
FBN Line (IN) Regulation Error I
DRVN
= 0.1mA, 2.5V < V
IN
< 6V ±5 mV
DRVN Source Current I
DRVN
V
FBN
= 300mV, V
DRVN
= -10V 1 mA
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
DEL Capacitor Charge Current During startup, V
DEL
= 1V 4 6 µA
DEL Turn-On Threshold V
TH
(
DEL
)
1.19 1.31 V
CTL Input Low Voltage V
IN
= 2.5V to 5.5V 0.6 V
CTL Input High Voltage V
IN
= 2.5V to 5.5V 2 V
SRC Input Voltage Range 36 V
V
DEL
= 1.5V, CTL = IN 300
SRC Input Current I
SRC
V
DEL
= 1.5V, CTL = AGND 200
µA
S RC - to- C O M S w i tch On- Resi stance R
SRC
(
ON
)
V
DEL
= 1.5V, CTL = IN 10 Ω
D RN - to- C O M S w i tch On- Resi stance R
DRN
(
ON
)
V
DEL
= 1.5V, CTL = AGND 60 Ω
ELECTRICAL CHARACTERISTICS
(V
IN
= 3V, V
MAIN
= V
SUP
= 14V, V
PGND
= V
AGND
= V
BGND
= 0V, I
REF
= 25µA, T
A
= 0°C to +105°C. Typical values are at T
A
= +25°C,
unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IN Supply Range V
IN
(Note 2) 2.5 6.0 V
IN Undervoltage-Lockout
Threshold
V
UVLO
V
IN
rising, typical hysteresis = 50mV 2.05 2.25 2.45 V
V
FB
= V
FBP
= 1.3V, V
FBN
= 0V,
LX not switching
0.6 1.0
IN Quiescent Current I
IN
V
FB
= 1.2V, V
FBP
= 1.4V, V
FBN
= 0V,
LX switching
23
mA
Duration-to-Trigger Fault
Condition
V
FB or FBP below threshold or FBN above
threshold
200 ms
T
A
= +25°C to +105°C 1.238 1.250 1.262
REF Output Voltage No external load
T
A
= 0°C to +105°C 1.232 1.250 1.266
V
REF Load Regulation 0 < I
LOAD
< 50µA 10 mV
REF Sink Current In regulation 10 µA
REF Undervoltage-Lockout
Threshold
Rising edge, typical hysteresis = 160mV 1.15 V
Temperature rising +160
Thermal Shutdown
Hysteresis 15
°C