MAX1626ESA+T Maxim Integrated Products, MAX1626ESA+T Datasheet - Page 13

• Manufacturer Part Number: MAX1626ESA+T
• Description: IC STP-DN DCDC CTRL 5/3.3V 8SOIC
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1626ESA+T

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 5V
• Current - Output: 3A
• Frequency - Switching: Up to 300kHz
• Voltage - Input: 3 ~ 16.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 471mW
• Package: 8SOIC N
• Input Voltage: 3 to 16.5 V
• Output Voltage: 3.3|5 V
• Output Current: 3 A
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 8. MAX1627 Typical Operating Circuit
________________________Applications
The MAX1626/MAX1627 typical operating circuits
(Figures 1 and 8) are designed to output 2A at a 5V
output voltage. The following circuits provide examples
and guidance for other applications.
When designing a low-power, battery-based applica-
tion, choose an external MOSFET with low gate capaci-
tance (to minimize switching losses), and use a low
peak current limit to reduce I
Figure 9 is optimized for 0.5A.
The circuit in Figure 10 outputs 6A at 2.5V from a 5V or
3.3V input. High-current design is difficult, and board
layout is critical due to radiated noise, switching tran-
sients, and voltage gradients on the PC board traces.
Figure 11 is a recommended PC board design. Choose
the external MOSFET to minimize R
gate-charge factor below the MAX1626/MAX1627’s
drive capability (see Ext Rise and Fall Times vs.
Capacitance graph in the Typical Operating
Characteristics ). Otherwise, increased MOSFET rise
and fall times will contribute to efficiency losses. For
higher efficiencies, especially at low output voltages,
the MAX796 family of step-down controllers with syn-
chronous rectification is recommended.
68 F LOW-ESR
0.1 F
C4
INPUT
N.C.
TANTALUM
High-Efficiency, Step-Down DC-DC Controllers
C2
OUT
SHDN
REF
High-Current Step-Down Converter
Micropower Step-Down Converter
GND
MAX1627
68 F LOW-ESR
R3
5V/3.3V or Adjustable, 100% Duty-Cycle,
______________________________________________________________________________________
TANTALUM
FB
EXT
CS
V+
C3
C
R2
R2
2
R losses. The circuit in
P
U1
LOGIC-LEVEL MOSFET
D1
R
0.15
22 H, 3A
SENSE
L1: SUMIDA CDRH125-220
D1: NIHON NSQ03A03
U1: MOTOROLA MMSF3P02HD
L1
DS(ON)
C5
0.47 F
ADJUSTABLE
. Keep the
C1
220 F
LOW-ESR
TANTALUM
OUTPUT
Figure 9. 0.5A Step-Down Converter
Figure 10. 6A Step-Down Converter
0.1 F
0.1 F
C10
68 F LOW-ESR
INPUT
C4
100 F
N.C.
TANTALUM
INPUT
C4
3V TO 6V
C2
OUT
SHDN
REF
REF
3/5
SHDN
GND
MAX1627
21.5k, 1%
MAX1626
R3
100 F
GND
C5
FB
EXT
V+
CS
OUT
EXT
CS
V+
20k, 1%
C
220pF
C3
0.47 F
R2
R2
D1
P
D1
2.7 H >8A
Q1
LOGIC-LEVEL MOSFET
C1–C3: SANYO OS-CON 220 F, 6.3V
C4, C5: SANYO OS-CON 100 F, 20V
RCS1, RCS2: 0.025 DALE WSL-2512
Q1: MOTOROLA MTB50PO3HDL
D1: NIEC C10T04Q
L1: SUMIDA CDRH127-2R7NC
C6
0.1 F
L1
P
R
0.025
R
0.15
U1
LOGIC-LEVEL MOSFET
CS1
68 H, 0.7A
SENSE
L1: SUMIDA CDR1053-680
D1: MOTOROLA MBRS130T3
U1: MOTOROLA MMSF3P02HD
, R
C7
0.1 F
L1
CS2
C1
220 F
C8
1.0 F
C2
220 F
OUTPUT
C1
100 F
LOW-ESR
TANTALUM
C9
1.0 F
OUTPUT
2.5V, 6A
C3
220 F
13