MAX8543 MAXIM [Maxim Integrated Products], MAX8543 Datasheet - Page 10

• Manufacturer Part Number: MAX8543
• Description: Step-Down Controllers with Prebias Startup, Lossless Sensing, Synchronization, and OVP
• Manufacturer: MAXIM [Maxim Integrated Products]

Step-Down Controllers with Prebias Startup,
Lossless Sensing, Synchronization, and OVP
10
(T
A
MAX8543
= +25°C, unless otherwise noted.)
______________________________________________________________________________________
10
11
12
—
1
2
3
4
5
6
7
8
9
PIN
10dB/div
MAX8544
0dB
1kHz
12
13
14
15
—
2
3
4
5
6
7
8
9
BODE PLOT, 600kHz, 15A LOAD
10kHz
NAME
COMP
PGND
ILIM1
GND
CS+
ILIM
CS-
EN
DL
SS
FB
VL
IN
SWEEP TIME
10.000s
100kHz
Ground. Connect to the analog ground plane.
Soft-Start. Connect a 0.1µF to 1µF ceramic capacitor from SS to GND. This capacitor
sets the soft-start period during startup. See the Startup and Soft-Start section. SS is
internally pulled to GND in shutdown.
Compensation. Connect to an external RC network to compensate the feedback loop.
See the Compensation Design section. COMP is internally pulled to GND in shutdown.
Output Feedback. Connect to the center of a voltage-divider connected between OUT
and GND to set the output voltage. The FB threshold voltage is 0.8V.
Enable. Drive EN logic high to enable the output, or drive logic low for shutdown.
Connect EN to IN for always-on operation.
Negative Differential Current-Sensing Input
Positive Differential Current-Sensing Input
Digital Programmable Current-Limit Input for Inductor Current Sensing (V
See Table 3.
Power Ground. Connect to the power ground plane and to the source of the low-side
external MOSFETs. Connect PGND to GND at a single point.
Low-Side MOSFET Gate-Driver Output. Connect to the gate of the low-side external
MOSFETs. DL is pulled low in shutdown.
Internal 5V Linear-Regulator Output. Connect a 1µF to 10µF ceramic capacitor from
VL to PGND. Connect VL to IN for V
gate drive.
Input Supply Voltage. IN is the input to the internal linear regulator. Connect VL to IN for
V
IN
MAX8543 toc19
less than 5.5V.
Typical Operating Characteristics (continued)
1MHz
90°
30°/div
10dB/div
0dB
IN
1kHz
less than 5.5V. VL provides power for bias and
FUNCTION
BODE PLOT, 600kHz, NO LOAD
10kHz
SWEEP TIME
10.000s
100kHz
Pin Description
MAX8543 toc20
1MHz
CS+
90°
30°/div
- V
CS-
).