MAX1540 datasheet(19/49 Pages) MAXIM

Part #	MAX1540

Description	Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual Step-Down Controllers with Saturation

Protection, Dynamic Output, and Linear Regulator

______________________________________________________________________________________

19

MAX1540

MAX1541

NAME

FUNCTION

24

31

LX1

Inductor Connection for Controller 1. Connect to the switched side of the inductor.

LX1 serves as the lower supply rail for the DH1 high-side gate driver.

25

32

DH1

High-Side Gate-Driver Output for Controller 1. DH1 swings from LX1 to BST1.

26

33

PGOOD1

Open-Drain Power-Good Output. PGOOD1 is low when the output voltage is more

than 10% (typ) above or below the normal regulation point, during soft-start, and in

shutdown. After the soft-start circuit has terminated, PGOOD1 becomes high

impedance if the output is in regulation. For the MAX1541, PGOOD1 is

blanked—forced high-impedance state—when FBLANK is enabled and the controller

detects a transition on GATE.

27

34

OUT1

Output Voltage-Sense Connection for Controller 1. Connect directly to the positive

terminal of the output capacitors as shown in the standard application circuits

(Figures 1 and 12). OUT1 senses the output voltage to determine the on-time for the

high-side switching MOSFET. For the MAX1540, OUT1 also serves as the feedback

input when using the preset internal output voltages as shown in Figure 10. When

discharge mode is enabled by OVP/UVP, the output capacitor is discharged through

an internal 10

Ω resistor connected between OUT1 and ground.

28

35

FB1

Feedback Input for Controller 1:

MAX1540: Connect to VCC for a +1.2V fixed output or to analog ground (GND) for a

+1.8V fixed output. For an adjustable output (0.7V to 5.5V), connect FB1 to a resistive

divider from OUT1. The FB1 regulation level is +0.7V.

MAX1541: The FB1 regulation level is set by the voltage at REFIN1.

29

36

CSN1

Negative Current-Sense Input for Controller 1. Connect to the negative terminal of the

current-sense element. Figure 14 and Table 9 describe several current-sensing

options. The PWM controller does not begin a cycle unless the current sensed is less

than the valley current-limit threshold programmed at ILIM1.

30

37

CSP1

Positive Current-Sense Input for Controller 1. Connect to the positive terminal of the

current-sense element. Figure 14 and Table 9 describe several current-sensing

options. The PWM controller does not begin a cycle unless the current sensed is less

than the valley current-limit threshold programmed at ILIM1.

—

38

FBLANK

Fault-Blanking Control Input. This four-level logic input enables or disables fault

blanking, and sets the forced-PWM operation time (tFBLANK). When fault blanking is

enabled, PGOOD1 and the OVP/UVP protection for controller 1 are blanked for the

selected time period after the MAX1541 detects a transition on GATE. Additionally,

controller 1 enters forced-PWM mode for the duration of tFBLANK anytime GATE

changes states. Connect FBLANK as follows:

VCC = 220µs tFBLANK, fault blanking enabled.

Open = 140µs tFBLANK, fault blanking enabled.

REF = 65µs tFBLANK, fault blanking enabled.

GND = 140µs tFBLANK, fault blanking disabled.

See the Electrical Characteristics table for the tFBLANK limits.

Pin Description (continued)

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