MAX1627ESA-T Maxim Integrated Products, MAX1627ESA-T Datasheet - Page 6

• Manufacturer Part Number: MAX1627ESA-T
• Description: DC/DC Switching Controllers 5/3.3V or Adjustable 100% Duty Cycle
• Manufacturer: Maxim Integrated Products

Specifications of MAX1627ESA-T

• Number Of Outputs: 1
• Output Voltage: 1.3 V to 16 V
• Output Current: 3 A
• Input Voltage: 3 V to 16.5 V
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8 Narrow
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C

5V/3.3V or Adjustable, 100% Duty-Cycle,
High-Efficiency, Step-Down DC-DC Controllers
Figure 1. MAX1626 Typical Operating Circuit
6
______________________________________________________________Pin Description
0.1 F
MAX1626
68 F LOW-ESR
C4
_______________________________________________________________________________________
INPUT
—
TANTALUM
1
2
3
4
5
6
7
8
3/5
SHDN
REF
C2
PIN
MAX1626
MAX1627
GND
—
1
2
3
4
5
6
7
8
C3
68 F LOW-ESR
TANTALUM
OUT
EXT
V+
CS
D1
NAME
SHDN
GND
OUT
REF
EXT
3/5
FB
V+
CS
P
R
0.04
U1
LOGIC-LEVEL MOSFET
SENSE
22 H, 3A
L1: SUMIDA CDRH125-220
D1: NIHON NSQ03A03
U1: MORTOLA MMSF3PO2HD
L1
C5
0.47 F
Sense input for fixed 5V or 3.3V output operation. OUT is internally connected to an
on-chip voltage divider (MAX1626). It does not supply current. Leave OUT uncon-
nected during adjustable-output operation (MAX1627).
Feedback Input for adjustable-output operation. Connect to an external voltage
divider between the output and GND (see the Setting the Output Voltage section).
3.3V or 5V Selection. Output voltage is set to 3.3V when this pin is low or 5V when it
is high.
Active-High Shutdown Input. Device is placed in shutdown when SHDN is driven
high. In shutdown mode, the reference, output, and external MOSFET are turned off.
Connect to GND for normal operation.
1.3V Reference Output. Can source 100µA. Bypass with 0.1µF.
Positive Supply Input. Bypass with 0.47µF.
Current-Sense Input. Connect current-sense resistor between V+ and CS. External
MOSFET is turned off when the voltage across the resistor equals the current-limit
trip level (around 100mV).
Gate Drive for External P-Channel MOSFET. EXT swings between V+ and GND.
Ground
C1
220 F
LOW-ESR
TANTALUM
OUTPUT
Figure 2. Simplified Functional Diagram
MAX1626
MAX1627
FUNCTION
MINIMUM OFF-TIME
Q
Q
MINIMUM ON-TIME
ONE-SHOT
ONE-SHOT
CURRENT-SENSE
COMPARATOR
TRIG
TRIG
S
1.5V
Q
R
EXT
REF
REF
ERROR
COMPARATOR
R1
( ) MAX1627 ONLY
R2
MAX1626 ONLY
R3
SHDN
(FB)
OUT
V+
CS
3/5