MAX1964 Ver la hoja de datos (PDF) - Maxim Integrated
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componentes Descripción
Fabricante
MAX1964 Datasheet PDF : 30 Pages
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Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
ELECTRICAL CHARACTERISTICS
(VIN = 12V, ILIM = FB = GND, VBST - VLX = 5V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Maximum Duty Cycle
Soft-Start Period
Soft-Start Step Size
DMAX
tSOFT
77
82
90
1024
VREF/64
%
1/fOSC
V
FB Power-Up Sequence
Threshold
MAX1964, FB rising, B2 turns on
1.145
V
DH Output Low Voltage
DH Output High Voltage
DL Output Low Voltage
DL Output High Voltage
DH On-Resistance
DL On-Resistance
Output Drive Current
LX, BST Leakage Current
POSITIVE ANALOG GAIN BLOCKS
ISINK = 10mA, measured from DH to LX
40
mV
ISOURCE = 10mA, measured from BST to DH
40
mV
ISINK = 10mA, measured from DL to GND
20
mV
ISOURCE = 10mA, measured from DL to GND VL - 0.1
V
High (DH to BST) and low (DH to LX)
1.5
4
Ω
High (DL to VL)
Low (DL to GND)
4.3
10
Ω
0.7
2
Sourcing or sinking, VDH or VDL = VL/2
0.5
A
VBST = VLX = VIN = 28V, VFB = 1.5V
0.04
10
µA
FB2, FB3, FB4 Regulation
Voltage
VB2 = VB3 = VB4 = 5V,
IB2 = IB3 = IB4 = 1mA (sink)
1.226 1.24 1.257
V
FB2 Power-Up Sequence
Threshold
MAX1964, FB2 rising, B3 turns on
1.145
V
FB2, FB3, FB4 to B_
Transconductance Error
∆VFB_
VB2 = VB3 = VB4 = 5V, IB2 = IB3 = IB4 =
0.5mA to 5mA (sink)
13
22
mV
Feedback Input Leakage
Current
IFB_
VFB2 = VFB3 = VFB4 = 1.5V
0.01 100
nA
Driver Sink Current
IB_
VFB2 = VFB3 = VB2 = VB3 = VB4 = 2.5V
10
VFB4 = 1.188V VB2 = VB3 = VB4 = 4.0V
21
24
mA
NEGATIVE ANALOG GAIN BLOCK
FB5 Regulation Voltage
VB5 = VOUT - 2V, VOUT = 3.5V, IB5 = 1mA
-20
-5
+10
mV
(source)
FB5 to B5 Transconductance Error ∆VFB5 VB5 = 0, IB5 = 0.5mA to 5mA (source)
-13
-20
mV
Feedback Input Leakage Current IFB5
VFB5 = -100mV
0.01 100
nA
Driver Source Current
IB5
VFB5 = 200mV, VB5 = VOUT - 2.0V, VOUT =
10
3.5V
25
mA
POWER GOOD (POK)
OUT Trip Level (Preset Mode)
FB Trip Level (Adjustable Mode)
FB2, FB3, FB4 Trip Level
FB5 Trip Level
POK Output Low Level
POK Output High Leakage
FB = GND, falling edge, 3% hysteresis (typ) 2.88
3.0
3.12
V
Falling edge, 3% hysteresis (typ)
1.070 1.114 1.159
V
Falling edge, 3% hysteresis (typ)
1.070 1.114 1.159
V
Rising edge, 35mV hysteresis (typ)
368
530
632
mV
ISINK = 1mA
VPOK = 5V
0.4
V
1
µA
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