Datasheet
MAX8792
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= V
EN
= 5V, REFIN = ILIM = REF, SKIP = GND. T
A
= 0°C to +85°C, unless otherwise spec-
ified. Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
TON to GND ...........................................................-0.3V to +28V
V
DD
to GND..............................................................-0.3V to +6V
V
CC
to GND................................................-0.3V to (V
DD
+ 0.3V)
EN, SKIP, PGOOD to GND.......................................-0.3V to +6V
REF, REFIN to GND....................................-0.3V to (V
CC
+ 0.3V)
ILIM, FB to GND .........................................-0.3V to (V
CC
+ 0.3V)
DL to GND..................................................-0.3V to (V
DD
+ 0.3V)
BST to GND.................................................(V
DD
- 0.3V) to +34V
BST to LX..................................................................-0.3V to +6V
BST to V
DD
.............................................................-0.3V to +28V
DH to LX....................................................-0.3V to (V
BST
+ 0.3V)
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
14-Pin 3mm x 3mm TDFN
(derated 24.4mW/°C above +70°C)....................1951mW
Operating Temperature Range (extended).........-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+240°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PWM CONTROLLER
Input Voltage Range V
IN
226V
Quiescent Supply Current (V
DD
)I
DD
+ I
CC
FB forced above REFIN 0.7 1.2 mA
Shutdown Supply Current (V
DD
)I
SHDN
EN = GND, T
A
= +25°C 0.1 2 μA
V
DD
-to-V
CC
Resistance R
CC
20 Ω
R
TON
= 97.5kΩ (600kHz) 118 139 160
R
TON
= 200kΩ (300kHz) 250 278 306On-Time t
ON
V
IN
= 12V,
V
FB
= 1.0V
(Note 3)
R
TON
= 302.5kΩ (200kHz) 354 417 480
ns
Minimum Off-Time t
OFF
(
MIN
)
(Note 3) 200 300 ns
TON Shutdown Supply Current
EN = GND, V
TON
= 26V,
V
CC
= 0V or 5V, T
A
= +25°C
0.01 1 μA
REFIN Voltage Range V
REFIN
(Note 2) 0 V
REF
V
FB Voltage Range V
FB
(Note 2) 0 V
REF
V
T
A
= +25°C 0.495 0.5 0.505
V
REFIN
= 0.5V,
m easur ed at FB,
V
I N
= 2V to 26V ,
SKIP = V
DD
T
A
= 0°C to +85°C 0.493 0.507
T
A
= +25°C 0.995 1.0 1.005
V
REFIN
= 1.0V
T
A
= 0°C to +85°C 0.993 1.007
FB Voltage Accuracy V
FB
V
REFIN
= 2.0V T
A
= 0°C to +85°C 1.990 2.0 2.010
V
FB Input Bias Current I
FB
V
FB
= 0.5V to 2.0V, T
A
= +25°C -0.1 +0.1 μA
Load-Regulation Error I
LOAD
= 0 to 3A, SKIP = V
DD
0.1 %
Line-Regulation Error V
CC
= 4.5V to 5.5V, V
IN
= 4.5V to 26V 0.25 %
Soft-Start/-Stop Slew Rate t
SS
Rising/falling edge on EN 1 mV/μs
Dynamic REFIN Slew Rate t
DYN
Rising edge on REFIN 8 mV/μs
REFERENCE
No load 1.990 2.00 2.010
Reference Voltage V
REF
V
CC
= 4.5V
to 5.5V
I
REF
= -10μA to +50μA 1.98 2.02
V