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MAX651ESA+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Controllers
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
80
66
SUPPLY CURRENT vs. TEMPERATURE
68
78
I+ (mA)
76
74
-60 -20 60 140
MAX649-A01
TEMPERATURE (°C)
20 100-40 0 8040 120
72
70
V+ = 10V
V+ = 16.5V
V+ = 4V
4.0
0
SHUTDOWN CURRENT
vs. TEMPERATURE
0.5
3.5
I+ (mA)
3.0
2.5
-60 -20 60 140
MAX649-A02
TEMPERATURE (°C)
20 100-40 0 8040 120
2.0
1.5
V+ = 8V
V+ = 16.5V
V+ = 4V
1.0
2500
0
0 1 2 3 4 5 6 7 8 9 101112131415
MAX649 MAXIMUM LOAD CURRENT
vs. SUPPLY VOLTAGE
500
2000
MAX649-A03
INPUT VOLTAGE (V)
MAXIMUM LOAD CURRENT (mA)
1500
1000
V
OUT
= 5V
CIRCUIT OF FIGURE 1
100
90
0
100µ 1m 10m 100m 1
MAX652
EFFICIENCY vs. LOAD CURRENT
20
MAX649-A06
LOAD CURRENT (A)
EFFICIENCY (%)
40
60
80
70
50
30
10
V
IN
= 4.3V
V
IN
= 5V
V
IN
= 8V
V
IN
= 10V
V
IN
= 12V
V
IN
= 15V
V
OUT
= 3V
TOP TO BOTTOM:
8.0
6.0
SWITCH ON-TIME/OFF-TIME RATIO
vs. TEMPERATURE
6.4
7.6
t
ON
/tOFF RATIO
7.2
6.8
6.2
6.6
7.8
7.4
7.0
V+ = 5V
-60 -20 60 140
MAX649-A9
TEMPERATURE (°C)
20 100-40 0 8040 120
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Controllers
_______________________________________________________________________________________
5
250
0
REFERENCE OUTPUT RESISTANCE
vs. TEMPERATURE
50
200
REFRENCE OUTPUT RESISTANCE (Ω)
150
100
-60 -20 60 140
MAX649-A16
TEMPERATURE (°C)
20 100-40 0 8040 120
I
REF
= 10µA
I
REF
= 50µA
I
REF
= 100µA
1.506
1.492
REFERENCE OUTPUT VOLTAGE
vs. TEMPERATURE
1.494
1.504
REFRENCE OUTPUT (V)
1.502
1.500
-60 -20 60 140
MAX649-A15
TEMPERATURE (°C)
20 100-40 0 8040 120
1.498
1.496
____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Controllers
6 _______________________________________________________________________________________
MAX649
LINE-TRANSIENT RESPONSE
250µs/div
A
B
I
LOAD
= 1A
A: INPUT VOLTAGE (7V & 12V), 5V/div
B: 5V OUT, AC COUPLED, 100mV/div
_____________________________Typical Operating Characteristics (continued)
MAX649
LOAD-TRANSIENT RESPONSE
250µs/div
A
B
A: LOAD CURRENT (100mA & 1A), 500mA/div
B: 5V OUTPUT VOLTAGE, AC COUPLED, 50mV/div
______________________________________________________________Pin Description
Positive power-supply inputV+5
CS6
Gate drive for external P-channel MOSFET. EXT swings between V+ and GND.EXT7
GroundGND8
1.5V reference output that can source 100µA. Bypass with 0.1µF.REF4
SHDN3
PIN
FB2
OUT
1
FUNCTIONNAME
Sense input for fixed 5V, 3.3V, or 3V output operation. OUT is internally connected to the on-chip voltage divider.
Although it is connected to the output of the circuit, the OUT pin does not supply current.
Feedback input. Connect to GND for fixed-output operation. Connect a resistor divider between OUT, FB,
and GND for adjustable-output operation. See
Setting the Output Voltage
section.
Active-high TTL/CMOS logic-level input. Part is placed in shutdown when SHDN is driven high. In shutdown mode,
the reference and the external MOSFET are turned off, and OUT = 0V. Connect to GND for normal operation.
Current-sense input. Connect current-sense resistor between V+ and CS. When the voltage across the
resistor equals the current-limit trip level, the external MOSFET is turned off.
MAX649
SHUTDOWN RESPONSE TIME
1ms/div
A
B
I
LOAD
= 1A
A: SHDN INPUT VOLTAGE (0V & 5V), 2V/div
B: 5V OUTPUT VOLTAGE
,
2V/div
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX651ESA+T

Mfr. #:
Buy MAX651ESA+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers 5V/3.3V/3V or Adj Low-IQ Step-Down
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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