Datasheet

1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Pin Description
PIN NAME FUNCTION
1 BST Boost Capacitor Connection. Connect a 0.1µF ceramic capacitor from BST to LX.
2 VD Internal Regulator Output. Bypass VD to GND with a 0.1µF ceramic capacitor.
3 SGND Internal Connection. SGND must be connected to GND.
4FB
Output Sense Feedback Connection. For fixed output voltage (MAX5035A, MAX5035B, MAX5035C),
connect FB to V
OUT
. For adjustable output voltage (MAX5035D, MAX5035E), use an external resistive
voltage-divider to set V
OUT
. V
FB
regulating set point is 1.22V.
5 ON/OFF
Shutdown Control Input. Pull ON/OFF low to put the device in shutdown mode. Drive ON/OFF high for
normal operation.
6 GND Ground
7V
IN
Input Voltage. Bypass V
IN
to GND with a low ESR capacitor as close to the device as possible.
8 LX Source Connection of Internal High-Side Switch
ENABLE
LX
BST
V
IN
ON/OFF
V
REF
REGULATOR
(FOR DRIVER)
REGULATOR
(FOR ANALOG)
OSC
RAMP
HIGH-SIDE
CURRENT
SENSE
I
REF-PFM
I
REF-LIM
CPFM
1.69V
CILIM
FB
x1
V
REF
EAMP
CONTROL
LOGIC
CPWM
VD
GND
R
h
R
l
CLK
SGND
MAX5035
TYPE 3
COMPENSATION
THERMAL
SHUTDOWN
RAMP
Block Diagram
MAX5035
Maxim Integrated
9