Rainbow Electronics MAX763A - Manual (Page 3)

MAX748A/MAX763A
3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
_________________________________________________________________________________________________ 3
Note 1: The standby current typically settles to 10µA (over temperature) within 2 seconds; however, to decrease test time, the part
is guaranteed at a 100µA maximum value.
MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
MAXIMUM OUTPUT CURRENT (mA)
0
200
400
600
800
1000
0 2 4 6 8 10 12 14 16
SUPPLY VOLTAGE (V)
MAX748A
MAX763A
NOTE 2
MAX763A
EFFICIENCY vs. OUTPUT CURRENT
EFFICIENCY (%)
60
65
70
75
80
85
90
95
100
0 100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
VIN = 7.0V VIN = 5.0V
VIN = 11.0V
NOTE 2
MAX748A
EFFICIENCY vs. OUTPUT CURRENT
EFFICIENCY (%)
OUTPUT CURRENT (mA)
60
65
70
75
80
85
90
95
100
0 100 200 300 400 500 600 700 800 900
VIN = 4.5V
VIN = 16V
VIN = 12V
VIN = 9V
VIN = 6V
NOTE 2
________________________________________________Typical Operating Characteristics
(Circuit of Figure 3, T A = +25°C, V
OUT
= 3.3V, unless otherwise noted.)
PARAMETER CONDITIONS
MAX748A MAX763A
UNITS
MIN TYP MAX MIN TYP MAX
Efficiency V+ = 5V
I
LOAD
= 300mA 88 88
%
I
LOAD
= 100mA 90 90
Supply Current Includes switch current 1.7 3.0 1.4 2.5 mA
Shutdown Current SHDN = 0V (Note 1) 0.2 100.0 0.2 100.0 µA
Shutdown Input V
IH
2.0 2.0
V
Threshold
V
IL
0.25 0.25
Shutdown Input
1.0 1.0 µA
Leakage Current
Short-Circuit Current 1.2 1.2 A
Undervoltage Lockout V+ falling 2.7 3.0 2.7 3.0 V
LX On Resistance I
LX
= 500mA 1.0 1.0 Ω
LX Leakage Current V+ = 12V, LX = 0 10 10 nA
Reference Voltage T
A
= +25°C 1.15 1.22 1.30 1.15 1.22 1.30 V
Reference Drift T
A
= T
MIN
to T
MAX
50 50 ppm/°C
Oscillator Frequency 159 180 212.5 159 200 212.5 kHz
Compensation Pin
7500 7500 Ω
Impedance
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V+ = 5V, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)