User guide

MAX8737
Dual, Low-Voltage Linear Regulator Controllers
with External MOSFETs
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, EN_ = CS_ = V
CC
, V
REFIN
= 1.0V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
REFERENCE INPUT
REFIN_ Voltage Range
V
REFIN
_
V
CC
= 4.75V to 5.5V 0.5 2.5 V
FAULT PROTECTION
Current-Limit Threshold V
ILIM
V
CS
_ - V
OUT
_ 6.5
13.5
mV
Linear Regulator UVP Threshold
(Slow)
UVP
(
SLOW
)
With respect to V
REFIN
; CS_ = V
CC
72 88 %
Linear Regulator UVP Threshold
(Fast)
UVP
(
FAST
)
With respect to V
REFIN
; CS_ = V
CC
54 66 %
INPUTS AND OUTPUTS
EN_ Input Low Level 0.6 V
EN_ Input High Level 1.6 V
Power-Good Trip Threshold
(Lower)
With respect to error comparator threshold,
hysteresis = 4% (falling edge)
-15 -9 %
Power-Good Output Low Voltage
I
SINK
= 4mA 0.3 V
Note 1: Low threshold n-channel MOSFET is required for 2.5V (±2%) output.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
OUTPUT-VOLTAGE DEVIATION
vs. LOAD CURRENT
MAX8737 toc01
LOAD CURRENT (A)
OUTPUT-VOLTAGE DEVIATION (mV)
1.51.00.5
-4
-3
-2
-1
0
1
2
3
4
5
-5
0 2.0
V
OUT
= 1.5V
FOLDBACK CURRENT LIMIT
vs. OUTPUT VOLTAGE
MAX8737 toc02
OUTPUT VOLTAGE (V)
CURRENT LIMIT (A)
1.00.5
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
0
0 1.5
1ms/div
SOFT-START
(EN RISING EDGE)
5V
3V
C
A
D
MAX8737 toc03
0
0
0
0
1.5V
5V
A. EN1, 5V/div
B. DRV1, 2V/div
NO LOAD
C. LDO1 OUTPUT, 1V/div
D. PGOOD1, 5V/div
B