MAX1542 Datasheet, PDF (3/20 Pages) Maxim Integrated Products – TFT LCD DC-to-DC Converter with Operational Amplifiers

TFT LCD DC-to-DC Converter with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V_IN = 3V, V_SUP = 8V, V_SRC = 28V, FREQ = IN (MAX1543), PGND = AGND = 0, T_A = 0°C to +85°C, typical values at T_A = +25°C,
unless otherwise noted.)
PARAMETER
FB Input Bias Current
FB Transconductance
FB Voltage Gain
LX On-Resistance
LX Leakage Current
LX Current Limit
Current-Sense Transresistance
Soft-Start Period
Soft-Start Step Size
OPERATIONAL AMPLIFIERS
SUP Supply Range
SUP Supply Current
Input Offset Voltage
Input Bias Current
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
Open-Loop Gain
Output Voltage Swing High
Output Voltage Swing Low
Short-Circuit Current
Output Source-and-Sink Current
Power-Supply Rejection Ratio
Slew Rate
SYMBOL
R_LX(ON)
I_LX
I_LIM
CONDITIONS
V_FB = 1.5V
∆I_COMP = 5µA
FB to COMP
V_LX = 13V
V_FB = 1V, duty cycle = 65%
MAX1542
t_SS
MAX1543
FREQ = AGND
FREQ = IN
V_SUP
I_SUP
V_OS
I_BIAS
V_CM
CMRR
Buffer configuration, V_{POS_} = 4V, no load
V_CM = V_SUP/2, T_A = +25°C
NEG1, NEG2, POS1, POS2
0 ≤ V_{NEG_}, V_{POS_} ≤ V_SUP
V_OH
V_OL
PSRR
I_{OUT_} = 100µA
I_{OUT_} = 5mA
I_{OUT_} = -100µA
I_{OUT_} = -5mA
To V_SUP/2
Source
Sink
Buffer configuration, V_{POS_} = 4V,
|∆V_OS| < 10mV
DC, 6V ≤ V_SUP ≤ 13V, V_{NEG_}, V_{POS_} =
V_SUP/2
MIN TYP MAX UNITS
-40
+40
nA
75
160 280
µS
700
V/V
210 400
mΩ
0.01
20
µA
1.2
1.5
1.8
A
0.30 0.50 0.65
Ω
14
13
ms
14
I_LIM / 8
A
4.5
13.0
V
1.3
1.9
mA
0
12
mV
+1
±50
nA
0
V_SUP
V
50
90
dB
125
dB
V_SUP - V_SUP -
15
2
mV
V_SUP - V_SUP -
150
80
2
15
mV
80
150
50
150
mA
50
140
40
mA
60
100
dB
7.5
V/µs
-3dB Bandwidth
R_L = 10kΩ, C_L =10pF, buffer configuration
12
MHz
Gain-Bandwidth Product
GBW Buffer configuration
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
DEL Capacitor Charge Current
During startup, V_DEL = 1V
8
MHz
4
5
6
µA
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