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MAX1992 Datasheet(PDF) 11 Page - Maxim Integrated Products

Part # MAX1992
Description  Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1992 Datasheet(HTML) 11 Page - Maxim Integrated Products

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Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
______________________________________________________________________________________
11
MAX1993 DYNAMIC OUTPUT VOLTAGE
TRANSITION (CREFIN = 1nF)
MAX1992 toc25
100
µs/div
B
A
C
1.5V
1.5V
2.5A
-2.5A
5V
5V
0
0
D
E
1.0V
A. VGATE = 0 TO 5V; 5V/div
B. OUTPUT = 1.5V TO 1.0V; 0.5V/div
C. VREFIN: 0.5V/div
D. PGOOD: 5V/div
E. INDUCTOR CURRENT: 2.5A/div
100mA LOAD, SKIP = GND, CIRCUIT OF FIGURE 9
MAX1993 DYNAMIC OUTPUT VOLTAGE
TRANSITION (CREFIN = 100pF)
MAX1992 toc26
40
µs/div
B
A
C
1.5V
1.5V
5A
-5A
5V
5V
0
0
D
E
1.0V
A. VGATE = 0 TO 5V; 5V/div
B. OUTPUT = 1.5V TO 1.0V; 0.5V/div
C. VREFIN: 0.5V/div
D. PGOOD: 5V/div
E. INDUCTOR CURRENT: 2.5A/div
100mA LOAD, SKIP = GND, CIRCUIT OF FIGURE 9
Typical Operating Characteristics (continued)
(MAX1992 Circuit of Figure 1, MAX1993 Circuit of Figure 9, VIN = 12V, VDD = VCC = 5V, SKIP = VCC, TON = open, TA = +25°C,
unless otherwise noted.)
Pin Description
PIN
MAX1992
MAX1993
NAME
FUNCTION
11
TON
On-Time Selection Control Input. This four-level logic input sets the K-factor value
used to determine the DH on-time (see the On-Time One-Shot section). Connect to
analog ground (AGND or GND), REF, VCC, or leave TON unconnected to select the
following nominal switching frequencies:
VCC = 200kHz
Open = 300kHz
REF = 450kHz
AGND = 600kHz
2, 7, 8
N.C.
No Connection. Not internally connected.
2
FBLANK
Fault Blanking Control Input. This four-level logic input enables or disables fault
blanking, and sets the minimum forced-PWM operation time (tFBLANK). When fault
blanking is enabled, PGOOD, OVP protection, and UVP protection are blanked for the
selected time period after a transition is detected on GATE. Additionally, the controller
enters forced-PWM mode for the duration of tFBLANK anytime GATE changes states.
Connect FBLANK as follows:
VCC = 140µs (min) tFBLANK, fault blanking enabled
Open = 90µs (min) tFBLANK, fault blanking enabled
REF = 40µs (min) tFBLANK, fault blanking enabled
AGND = 90µs (min) tFBLANK, fault blanking disabled


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