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MAX5090CATE-T Datasheet(PDF) 7 Page - Maxim Integrated Products

Part # MAX5090CATE-T
Description  2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX5090CATE-T Datasheet(HTML) 7 Page - Maxim Integrated Products

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2A, 76V, High-Efficiency MAXPower Step-Down
DC-DC Converters
_______________________________________________________________________________________
7
Pin Description
PIN
NAME
FUNCTION
1, 2
LX
Source Connection of Internal High-Side Switch
3
BST
Boost Capacitor Connection. Connect a 0.22µF ceramic capacitor from BST to LX.
4VIN
Input Voltage. Bypass VIN to SGND with a low-ESR capacitor as close to the device as possible.
5VD
Internal Regulator Output. Bypass VD to PGND with a 3.3µF/10V or greater ceramic capacitor.
6
SYNC
Synchronization Input. Connect SYNC to an external clock for synchronization. Connect to SGND to
select the internal 127kHz switching frequency.
7SS
Soft-Start Capacitor Connection. Connect an external capacitor from SS to SGND to adjust the soft-
start time.
8FB
Output Sense Feedback Connection.
For fixed output voltage (MAX5090A/MAX5090B), connect FB to VOUT.
For adjustable output voltage (MAX5090C), use an external resistive voltage-divider to set VOUT. VFB
regulating set point is 1.228V.
9
ON/OFF
Shutdown Control Input. Pull ON/OFF low to put the device in shutdown mode. Drive ON/OFF high for
normal operation. Connect ON/OFF to VIN with short leads for always-on operation.
10
SGND
Signal Ground. SGND must be connected to PGND for proper operation.
11, 15, 16
N.C.
No Connection. Not internally connected.
12
PGND
Power Ground
13, 14
DRAIN
Internal High-Side Switch Drain Connection
—EP
Exposed Pad. Solder EP to SGND plane to aid in heat dissipation. Do not use as the only electrical
ground connection.
Detailed Description
The MAX5090 step-down DC-DC converter operates
from a 6.5V to 76V input voltage range. A unique volt-
age-mode control scheme with voltage feed-forward
and an internal switching DMOS FET provides high effi-
ciency over a wide input voltage range. This pulse-
width-modulated converter operates at a fixed 127kHz
switching frequency or can be synchronized with an
external system clock frequency. The device also fea-
tures automatic pulse-skipping mode to provide high
efficiency at light loads. Under no load, the MAX5090
consumes only 310µA, and in shutdown mode, con-
sumes only 20µA. The MAX5090 also features under-
voltage-lockout, hiccup-mode output short-circuit
protection and thermal shutdown.
ON/OFF/Undervoltage Lockout (UVLO)
Use the ON/OFF function to program the external UVLO
threshold at the input. Connect a resistive voltage-
divider from VIN to SGND with the center node to
ON/OFF, as shown in Figure 1. Calculate the threshold
value by using the following formula:
Set the external VUVLO(TH) to greater than 6.45V. The
maximum recommended value for R2 is less than 1M
Ω.
ON/OFF is a logic input and can be safely driven to the
full VIN range. Connect ON/OFF to VIN for automatic
startup. Drive ON/OFF to ground to shut down the
MAX5090. Shutdown forces the internal power MOSFET
off, turns off all internal circuitry, and reduces the VIN
supply current to 20µA (typ). The ON/OFF rising thresh-
old is 1.546V (max). Before any operation begins, the
voltage at ON/OFF must exceed 1.546V. The ON/OFF
input has 100mV hysteresis.
If the external UVLO threshold setting divider is not
used, an internal undervoltage-lockout feature monitors
the supply voltage at VIN and allows the operation to
start when VIN rises above 6.45V (max). The internal
UVLO rising threshold is set at 6.17V with 0.5V hystere-
sis. The VIN and VON/OFF voltages must be above 6.5V
and 1.546V, respectively, for proper operation.
V
R
R
x
UVLO TH
()
.
=+


1
1
2
138


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