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MAX15035 Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # MAX15035
Description  15A Step-Down Regulator with Internal Switches
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX15035 Datasheet(HTML) 10 Page - Maxim Integrated Products

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15A Step-Down Regulator with Internal Switches
10
______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1, 17, 27, 31,
39, 40
N.C.
No Connection. Not internally connected.
2EN
Shutdown Control Input. Connect to VDD for normal operation. Pull EN low to put the controller into its
2µA (max) shutdown state. The MAX15035 slowly ramps down the target/output voltage to ground
and after the target voltage reaches 0.1V, the controller forces LX into a high-impedance state and
enters the low-power shutdown state. Toggle EN to clear the fault-protection latch.
3, 28
AGND
Analog Ground. Internally connected to EP1.
4VDD
Supply Voltage Input for the DL Gate Driver. Connect to the system supply voltage (+4.5V to +5.5V).
Bypass VDD to power ground with a 1µF or greater ceramic capacitor.
5, 16
LX
Inductor Connection. Internally connected to EP2. Connect LX to the switched side of the inductor as
shown in Figure 1.
6–15
PGND
Power Ground
18–26
IN
Power MOSFET Input Power Source. Internally connected to EP3.
29
TON
Switching Frequency-Setting Input. An external resistor between the input power source and TON
sets the switching period (tSW = 1/fSW) according to the following equation:
where CTON = 16.26pF and VFB = VREFIN under normal operating conditions. If the TON current
drops below 10µA, the MAX15035 shuts down and enters a high-impedance state. TON is high
impedance in shutdown.
30
BST
Boost Flying Capacitor Connection. Connect to an external 0.1µF capacitor as shown in Figure 1. The
MAX15035 contains an internal boost switch/diode (Figure 2).
tC
R
k
V
V
SW
TON
TON
FB
OUT
=+
()
⎝⎜
⎠⎟
65
.
DYNAMIC OUTPUT-VOLTAGE TRANSITION
(PWM MODE)
MAX15035 toc28
40
µs/div
C. INDUCTOR CURRENT,
10A/div
D. LX, 10V/div
-6A
0
1.5V
1.5V
1.05V
1.05V
12V
0
A
B
C
D
A. REFIN, 500mV/div
B. VOUT, 200mV/div
IOUT = 2A
DYNAMIC OUTPUT-VOLTAGE TRANSITION
(SKIP MODE)
MAX15035 toc29
40
µs/div
C. INDUCTOR CURRENT,
10A/div
D. LX, 10V/div
10A
0
1.5V
1.5V
1.05V
1.05V
12V
0
A
B
C
D
A. REFIN, 500mV/div
B. VOUT, 200mV/div
IOUT = 2A
Typical Operating Characteristics (continued)
(MAX15035 Circuit of Figure 1, VIN = 12V, VDD = 5V, SKIP = GND, RTON = 200kΩ, TA = +25°C, unless otherwise noted.)


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