MAX797HESE+ Maxim Integrated Products, MAX797HESE+ Datasheet - Page 7

• Manufacturer Part Number: MAX797HESE+
• Description: IC CTRLR SYNC STEPDOWN 16-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX797HESE+

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 5V, Adj
• Current - Output: 10A
• Frequency - Switching: 150kHz, 300kHz
• Voltage - Input: 4.5 ~ 40 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Power - Output: 696mW
• Output Voltage: 5 V
• Output Current: 10 A
• Input Voltage: 4.5 V
• Supply Current: 0.44 mA
• Switching Frequency: 340 KHz
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Similarly, at 150kHz, the minimum duty factor is
0.425µs / 6.67µs = 0.064. This means that duty factor is
not an issue except at the maximum input voltage and
minimum output voltage. For example, if V
the lowest V
Figure 1. Powering V+ and VL from a Regulated +5V supply
OUT
High-Voltage, Step-Down Controller with
that does not require less than the
_______________________________________________________________________________________
Synchronous Rectifier for CPU Power
REGULATED
SHDN
SS
REF
SYNC
GND
SUPPLY
SKIP
V+
MAX797H
+5V
IN
VL
FB
is 40V,
PGND
CSH
BST
CSL
DH
LX
DL
minimum duty factor is 40V x 0.064 = 2.56V. If V
V
the output voltage, but may extend the period and
switch at 75kHz instead of 150kHz. It may also alter
nate between these two frequencies.
IN
is less than this value, the IC will properly regulate
+4V TO +40V
POWER INPUT
OUTPUT
+3.3V
OUT
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