MAX5072ETJ+T Maxim Integrated Products, MAX5072ETJ+T Datasheet - Page 14

• Manufacturer Part Number: MAX5072ETJ+T
• Description: IC CONV BUCK/BOOST 32-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck), Step-Up (Boost)r

Specifications of MAX5072ETJ+T

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 28 V
• Current - Output: 1A, 2A
• Frequency - Switching: 200kHz ~ 2.2MHz
• Voltage - Input: 4.5 ~ 23 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Power - Output: 2.76W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.2MHz, Dual-Output Buck or Boost
Converter with POR and Power-Fail Output
Figure 3. Synchronized Controllers
Sometimes it is necessary to operate the converter at a
lower switching frequency to keep the losses low for
lower power dissipation. However, it is not possible to
have different frequencies for two converters operating
out-of-phase. Also, frequency beating may occur if the
individual converter frequencies are not selected care-
fully. To avoid these issues, and still achieve the lower
14
DUTY CYCLE = 50%
C
______________________________________________________________________________________
IN
(MASTER)
(MASTER)
(MASTER)
SOURCE1
SOURCE2
SOURCE1
SOURCE2
(RIPPLE)
CLKOUT
CLKOUT
(SLAVE)
(SLAVE)
(SLAVE)
SYNC
SYNC
PHASE
OUTPUT2
V
IN
CLKIN
Frequency Select (FSEL1)
DRAIN2
SOURCE2
SYNC
MASTER
V+
SOURCE1
CLKOUT
DRAIN1
CLKOUT
PHASE
OUTPUT1
CIN
power dissipation in the package, the MAX5072 pro-
vides a frequency select (FSEL1) pin. Connecting
FSEL1 to ground reduces the switching frequency of
converter 1 to 1/2 the switching frequency of converter
2 and 1/4th of the internal oscillator switching frequen-
cy. In this case, the input capacitor ripple frequency is
1.5 times the converter 2 switching frequency and also
has unsymmetrical ripple waveform.
OUTPUT4
DRAIN2
SOURCE2
SYNC
SLAVE
V+
SOURCE1
DRAIN1
OUTPUT3