Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
MAX1692
ABSOLUTE MAXIMUM RATINGS
IN, BP,
SHDN,
SYNC/PWM, LIM to GND ................ -0.3V to +6V
BP to IN .................................................................-0.3V to +0.3V
PGND to GND ...................................................... -0.3V to +0.3V
LX to PGND................................................. -0.3V to (V
IN
+ 0.3V)
FB, REF to GND ......................................... -0.3V to (V
BP
+ 0.3V)
Reference Current ............................................................. 鹵1mA
LX Peak Current (internally limited)...................................... 1.6A
Continuous Power Dissipation (T
A
= +70擄C)
10-Pin 碌MAX (derate 5.6mW/擄C above +70擄C) ............444mW
Operating Temperature Range .......................... -40擄C to +85擄C
Maximum Junction Temperature .................................... +150擄C
Storage Temperature Range ............................ -65擄C to +160擄C
Lead Temperature (soldering, 10sec) .............................+300擄C
Stresses beyond those listed under 鈥淎bsolute Maximum Ratings鈥?may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
IN
= +3.6V, SYNC/PWM = GND, V
LIM
= 3.6V,
SHDN
= IN, circuit of Figure 2;
T
A
= 0擄C to +85擄C,
unless otherwise noted. Typical
values are at T
A
= +25擄C.)
PARAMETER
Input Voltage Range
SYMBOL
V
IN
FB = OUT, V
IN
= V
LIM
= 2.7V to 5.5V,
I
OUT
= 0
Output Voltage
V
OUT
FB = OUT, V
IN
= 2.7V to 5.5V,
I
OUT
= 0 to 600mA, LIM = IN or
I
OUT
= 0 to 250mA, LIM = GND
(Note 1)
V
FB
FB = OUT, V
IN
= V
LIM
= 5.5V, I
OUT
= 0
(duty cycle = 23%) (Note 2)
Duty cycle = 100% to 23%
I
OUT
= 0 to 600mA, LIM = IN or
I
OUT
= 0 to 250mA, LIM = GND
I
FB
P
RDS(ON)
N
RDS(ON)
V
FB
= 1.4V
I
LX
= 180mA
I
LX
= 180mA
V
IN
= 3.6V
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 2.7V
0.35
0.75
-450
0
80
SYNC/PWM = GND, V
FB
= 1.4V,
LX unconnected
SHDN
= LX = GND, includes LX leakage
current
V
IN
= 5.5V, V
LX
= 0 or 5.5V
f
OSC
duty
MAX
duty
MIN
V
REF
I
REF
= 0
1.235
1.250
-20
650
500
100
22
1.265
-50
CONDITIONS
MIN
2.7
1.223
1.249
TYP
MAX
5.5
1.275
V
1.190
V
REF
1.223
1.249
+1
-1.3
0.01
0.3
0.4
0.4
0.5
0.6
1.2
-850
50
120
85
0.1
0.1
750
50
0.65
0.8
0.85
1.55
-1600
100
160
140
10
20
830
1000
1.232
1.275
V
IN
1.275
V
V
%
%
nA
鈩?/div>
鈩?/div>
A
mA
mA
碌A(chǔ)
碌A(chǔ)
碌A(chǔ)
kHz
kHz
%
%
V
UNITS
V
Output Adjustment Range
Feedback Voltage
Line Regulation
Load Regulation
FB Input Current
P-Channel On-Resistance
N-Channel On-Resistance
P-Channel Current-Limit
Threshold
N-Channel Current-Limit
Threshold
Pulse-Skipping Current-Limit
Threshold
Quiescent Current
Shutdown Supply Current
LX Leakage Current
Oscillator Frequency
SYNC Capture Range
Maximum Duty Cycle
Minimum Duty Cycle
Reference Output Voltage
2
LIM = GND
LIM = IN
V
FB
= 1.4V
SYNC/PWM = IN, FB = REF
_______________________________________________________________________________________
prev
next