MAX8792(2007) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8792 Datasheet PDF : 29 Pages
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Single Quick-PWM Step-Down
Controller with Dynamic REFIN
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 12V, VDD = VCC = VEN = 5V, REFIN = ILIM = REF, SKIP = GND. TA = 0°C to +85°C, unless otherwise spec-
ified. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
GATE DRIVERS
DH Gate Driver On-Resistance
Low state (pulldown)
RON(DH) BST - LX forced to 5V
High state (pullup)
1.2
3.5
Ω
1.2
3.5
DL Gate Driver On-Resistance
High state (pullup)
RON(DL) Low state (pulldown)
1.7
4
Ω
0.9
2
DH Gate Driver Source/
Sink Current
IDH
DH forced to 2.5V, BST - LX forced to 5V
1.5
A
DL Gate Driver Source Current
DL Gate Driver Sink Current
Driver Propagation Delay
IDL(SOURCE) DL forced to 2.5V
IDL(SINK) DL forced to 2.5V
DH low to DL high
DL low to DH high
1
A
2.4
A
10
25
ns
15
35
DL Transition Time
DH Transition Time
Internal BST Switch On-Resistance
INPUTS AND OUTPUTS
RBST
DL falling, CDL = 3nF
DL rising, CDL = 3nF
DH falling, CDH = 3nF
DH rising, CDH = 3nF
IBST = 10mA, VDD = 5V
20
ns
20
20
ns
20
4
7
Ω
EN Logic-Input Threshold
EN Logic-Input Current
SKIP Quad-Level Input Logic
Levels
VEN EN rising edge, hysteresis = 450mV (typ)
1.20 1.7 2.20
V
IEN
EN forced to GND or VDD, TA = +25°C
-0.5
+0.5
µA
High (5V VDD)
VCC -
0.4
VSKIP
Mid (3.3V)
Ref (2.0V)
3.0
3.6
V
1.7
2.3
SKIP Logic-Input Current
ISKIP
Low (GND)
SKIP forced to GND to VDD
0.4
-2
+2
µA
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VIN = 12V, VDD = VCC = VEN = 5V, REFIN = ILIM = REF, SKIP = GND. TA = -40°C to +85°C, unless otherwise
specified.) (Note 1)
PARAMETER
PWM CONTROLLER
Input Voltage Range
Quiescent Supply Current (VDD)
On-Time
SYMBOL
CONDITIONS
MIN
VIN
2
IDD + ICC FB forced above REFIN
VIN = 12V
tON
VFB = 1.0V
(Note 3)
RTON = 97.5kΩ (600kHz) 115
RTON = 200kΩ (300kHz)
250
RTON = 302.5kΩ (200kHz) 348
MAX UNITS
26
V
1.2
mA
163
306
ns
486
4 _______________________________________________________________________________________
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