Datasheet

MAX8792
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
6 _______________________________________________________________________________________
Note 1: Limits are 100% production tested at T
A
= +25°C. Maximum and minimum limits over temperature are guaranteed by
design and characterization.
Note 2: The 0 to 0.5V range is guaranteed by design, not production tested.
Note 3: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, V
BST
= 5V,
and a 250pF capacitor connected from DH to LX. Actual in-circuit times can differ due to MOSFET switching speeds.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= V
EN
= 5V, REFIN = ILIM = REF, SKIP = GND. T
A
= -40°C to +85°C, unless otherwise
specified.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
INPUTS AND OUTPUTS
EN Logic-Input Threshold V
EN
EN rising edge; hysteresis = 450mV (typ) 1.20 2.20 V
High (5V V
DD
)
V
CC
-
0.4
Mid (3.3V) 3.0 3.6
Ref (2.0V) 1.7 2.3
SKIP Quad-Level Input Logic
Levels
V
SKIP
Low (GND) 0.4
V
1.5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX8792 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
10.1
30
40
50
60
70
80
90
100
20
0.01 10
7V
20V
SKIP MODE
PWM MODE
12V
1.5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX8792 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
10.1
30
40
50
60
70
80
90
100
20
0.01 10
SKIP MODE
PWM MODE
LOW-NOISE
MODE
1.5V OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8792 toc03
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
4682
1.50
1.52
1.54
1.48
010
SKIP MODE
PWM MODE
LOW-NOISE
MODE
Typical Operating Characteristics
(MAX8792 Circuit of Figure 1, V
IN
= 12V, V
DD
= 5V, SKIP = GND, R
TON
= 200kΩ, T
A
= +25°C, unless otherwise noted.)