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MAX1974EUB+

P1-P3P4-P6P7-P9P10-P12P13-P15
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
CTL_
= 3.3V, FB = OUT, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS
MIN
TYP
MAX
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
+170
°C
Thermal-Shutdown Hysteresis 20 °C
ELECTRICAL CHARACTERISTICS
(V
IN
= V
FB
= V
CTL_
= 3.3V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
IN
IN Voltage Range 2.6 5.5 V
IN Undervoltage Lockout
Threshold
Rising and falling, hysteresis is 25mV (typ) 2.2 2.5 V
Supply Current Switching with no load 7.5 mA
Supply Current in Dropout V
OUT
set for 3.6V 5 mA
Shutdown Supply Current V
IN
= 5.5V 10 µA
FB
MAX1973
1.25
V
IN
Output Voltage Range
MAX1974
0.75
V
IN
V
FBSEL not connected
1.2375 1.2625
FBSEL = GND
1.7820 1.8180
MAX1973
FBSEL = IN
2.4750 2.5250
FBSEL not connected
0.7425 0.7575
FBSEL = GND
0.99 1.01
FB Regulation Voltage
MAX1974
FBSEL = IN
1.485 1.515
V
FB Regulation Voltage
Positive Voltage Margining
MAX1973, CTL1 = GND, CTL2 = IN 3 5 %
FB Regulation Voltage
Negative Voltage Margining
MAX1973, CTL1 = IN, CTL2 = GND -3 -5 %
FB Input Resistance to GND in
Preset Output Modes
10 70 kΩ
FB Input Bias Current FBSEL not connected
-0.15 +0.15
µA
SS (REFERENCE OUTPUT)
SS Source Current -25 -15 µA
SS Sink Current 10 35 µA
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS
(V
IN
= V
CTL_
= 3.3V, FB = OUT, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
SS to GND Resistance
in Shutdown
5 40 100 Ω
FBSEL
Low Input Threshold 0.3 V
High Input Threshold
V
IN
-
0.4
V
Input Bias Current FBSEL = GND or IN, V
IN
= 5.5V -20
+20
µA
COMP
Transconductance
from FB to COMP
40 80 µS
COMP to GND Resistance
in Shutdown
5 100 Ω
Clamp Voltage Low 0.6 1.2 V
Clamp Voltage High 1.3 2.2 V
LX
On-Resistance High V
IN
= 3.3V
0.46
Ω
On-Resistance Low V
IN
= 3.3V
0.32
Ω
Current-Sense Transresistance
0.275 0.425
V/A
Positive Current-Limit Threshold
1.10 1.85
A
Negative Current-Limit Threshold
-1.20 -0.35
A
V
LX
= V
IN
= 5.5V 20
LX Shutdown Leakage Current
LX = GND, V
IN
= 5.5V -20
µA
Switching Frequency 1.2 1.6
MHz
CTL1, CTL2 (MAX1973), ON (MAX1974)
Logic-Low Input Threshold 0.6 V
Logic-High Input Threshold 1.6 V
Logic Input Current -1 1 µA
POK (MAX1974 only)
Output Low Voltage POK sinking 1mA 100 mV
Rising 90 95
Output Valid Threshold
for POK
Percentage of nominal
regulation voltage
Falling 88 92
%
Note 2: Specifications to -40°C are guaranteed by design and not production tested.
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
6 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuits of Figure 2, 3, and 4; T
A
= +25°C, unless otherwise noted.)
100
0
0.01 0.1 1
EFFICIENCY vs. LOAD CURRENT
20
10
MAX1973/74 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
40
30
60
70
50
80
90
V
OUT
= 2.5V
V
OUT
= 1V
V
OUT
= 1.8V
V
IN
= 3.3V
100
0
0.01 0.1 1
EFFICIENCY vs. LOAD CURRENT
20
10
MAX1973/74 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
40
30
60
70
50
80
90
V
OUT
= 3.3V
V
OUT
= 2.5V
V
IN
= 5V
0
0.10
0.05
0.20
0.15
0.30
0.25
0.35
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX1973/74 toc03
LOAD CURRENT (A)
DROPOUT VOLTAGE (V)
0 0.2 0.4 0.6 0.8
V
OUT
= 3.3V
V
OUT
= 2.5V
0
4
2
8
6
10
12
021345
NO-LOAD CURRENT vs. INPUT VOLTAGE
MAX1973/74 toc04
INPUT VOLTAGE (V)
NO-LOAD CURRENT (mA)
V
OUT
= 2.5V
1.244
1.245
1.246
1.247
1.248
1.249
1.250
1.251
1.252
0 0.2 0.4 0.6 0.8 1.0
FB VOLTAGE vs. LOAD CURRENT
MAX1973/74 toc05
LOAD CURRENT (A)
FB VOLTAGE (V)
MAX1973
V
IN
= 5V
R1 = 22kΩ
R2 = 13kΩ
-4.0
-2.5
-3.0
-3.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
0.01 10.1 10 100 1000
CHANGE IN OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1973/74 toc06
LOAD CURRENT (A)
CHANGE IN OUTPUT VOLTAGE (mV)
V
IN
= 5V
V
OUT
= 1.8V
2.5V
1V
1.10
1.20
1.15
1.30
1.25
1.35
1.40
24356
SWITCHING FREQUENCY
vs. SUPPLY VOLTAGE
MAX1973/74 toc07
SUPPLY VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX1974EUB+

Mfr. #:
Buy MAX1974EUB+
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 1A 1.4MHz Step-Down Regulator
Lifecycle:
New from this manufacturer.
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