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MAX8792ETD+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
MAX8792
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE DRIVERS
Low state (pulldown) 1.2 3.5
DH Gate Driver On-Resistance R
ON
(
DH
)
BST - LX forced to 5V
High state (pullup) 1.2 3.5
Ω
High state (pullup) 1.7 4
DL Gate Driver On-Resistance R
ON
(
DL
)
Low state (pulldown) 0.9 2
Ω
DH Gate Driver Source/
Sink Current
I
DH
DH forced to 2.5V, BST - LX forced to 5V 1.5 A
DL Gate Driver Source Current I
D L
(
S OU RC E
)
DL forced to 2.5V 1 A
DL Gate Driver Sink Current I
DL
(
SINK
)
DL forced to 2.5V 2.4 A
DH low to DL high 10 25
Driver Propagation Delay
DL low to DH high 15 35
ns
DL falling, C
DL
= 3nF 20
DL Transition Time
DL rising, C
DL
= 3nF 20
ns
DH falling, C
DH
= 3nF 20
DH Transition Time
DH rising, C
DH
= 3nF 20
ns
Inter nal BS T S w i tch On- Resi stance R
BST
I
BST
= 10mA, V
DD
= 5V 4 7 Ω
INPUTS AND OUTPUTS
EN Logic-Input Threshold V
EN
EN rising edge, hysteresis = 450mV (typ) 1.20 1.7 2.20 V
EN Logic-Input Current I
EN
EN forced to GND or V
DD
, T
A
= +25°C -0.5 +0.5 μA
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
SKIP Logic-Input Current I
SKIP
SKIP forced to GND or V
DD
-2 +2 μA
ELECTRICAL CHARACTERISTICS
(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
PWM CONTROLLER
Input Voltage Range V
IN
226V
Quiescent Supply Current (V
DD
)I
DD
+ I
CC
FB forced above REFIN 1.2 mA
R
TON
= 97.5kΩ (600kHz) 115 163
R
TON
= 200kΩ (300kHz) 250 306On-Time t
ON
V
IN
= 12V,
V
FB
= 1.0V
(Note 3)
R
TON
= 302.5kΩ (200kHz) 348 486
ns
MAX8792
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
_______________________________________________________________________________________ 5
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
Minimum Off-Time t
OFF
(
MIN
)
(Note 3) 350 ns
REFIN Voltage Range V
REFIN
(Note 2) 0 V
REF
V
FB Voltage Range V
FB
(Note 2) 0 V
REF
V
V
REFIN
= 0.5V 0.49 0.51
V
REFIN
= 1.0V 0.99 1.01
FB Voltage Accuracy V
FB
M easur ed at FB,
V
I N
= 2V to 26V ,
SKIP = V
DD
V
REFIN
= 2.0V 1.985 2.015
V
REFERENCE
Reference Voltage V
REF
V
CC
= 4.5V to 5.5V 1.985 2.015 V
FAULT DETECTION
Output Overvoltage-Protection
Trip Threshold
OVP
With respect to the internal target voltage
(error comparator threshold); rising edge;
hysteresis = 50mV
250 350 mV
Output Undervoltage-Protection
Trip Threshold
UVP
With respect to the internal target voltage
(error comparator threshold);
falling edge; hysteresis = 50mV
-240 -160 mV
Output Undervoltage
Fault-Propagation Delay
t
UVP
FB forced 25mV below trip threshold 80 400 μs
PGOOD Output Low Voltage I
SINK
= 3mA 0.4 V
V
CC
Undervoltage Lockout
Threshold
V
U V L O
(
V C C
)
Ri si ng ed g e, P W M d i sab l ed b el ow thi s l evel ;
hysteresis = 100mV
3.95 4.45 V
CURRENT LIMIT
ILIM Input Range 0.4 V
REF
V
V
ILIM
= 0.4V 17 23
Current-Limit Threshold V
ILIMIT
ILIM = REF (2.0V) 90 110
mV
Ultrasonic Frequency SKIP = open (3.3V); V
FB
= V
REFIN
+ 50mV 17 kHz
GATE DRIVERS
Low state (pulldown) 3.5
DH Gate Driver On-Resistance R
ON
(
DH
)
BST - LX forced
to 5V
High state (pullup) 3.5
Ω
High state (pullup) 4
DL Gate Driver On-Resistance R
ON
(
DL
)
Low state (pulldown) 2
Ω
Inter nal BS T S w i tch On- Resi stance R
BST
I
BST
= 10mA, V
DD
= 5V 7 Ω
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.)
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MAX8792ETD+T

Mfr. #:
Buy MAX8792ETD+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Single Quick-PWM Step-Down Controller
Lifecycle:
New from this manufacturer.
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