max5951etjt Maxim Integrated Products, Inc., max5951etjt Datasheet - Page 6

• Manufacturer Part Number: max5951etjt
• Description: Max5951 12v/5v Input Buck Pwm Controller
• Manufacturer: Maxim Integrated Products, Inc.

12V/5V Input Buck PWM Controller
6
(Typical Operating Circuits. V
C
5.15
5.10
5.05
5.00
4.95
4.90
4.85
REG
10
100
-10
-20
9
8
7
6
5
4
3
2
1
90
80
70
60
50
40
30
20
10
0
_______________________________________________________________________________________
50
0
0
= 2.2µF, T
100
10
10
150 200 250
OPEN-LOOP GAIN/PHASE
REG OUTPUT VOLTAGE
SWITCHING PERIOD
100
vs. LOAD CURRENT
vs. FREQUENCY
FREQUENCY (Hz)
A
= +25°C.)
20
I
vs. R
R
1k
REG
RT
(kΩ)
(mA)
300 350
10k 100k
RT
30
IN
400
40
= 12V or V
MAX5951 toc09
1M
450
10M
500
50
200
180
160
140
120
100
80
60
40
IN
= V
1030
1020
1010
1000
REG
5.06
5.04
5.02
5.00
4.98
4.96
990
980
970
350
300
250
200
150
100
Typical Operating Characteristics (continued)
50
-40
500
= 5V, V
8
VALLEY CURRENT-LIMIT THRESHOLD
1000
-15
SWITCHING FREQUENCY
DREG
REG OUTPUT VOLTAGE
10
vs. INPUT VOLTAGE
vs. TEMPERATURE
1500
TEMPERATURE (°C)
PWM_IN (V)
10
= V
vs. V
V
ILIM
2000
12
REG
(mV)
ILIM
35
, V
2500
R
RT
PGND
14
= 49.9kΩ
60
3000
= 0V, V
3500
85
16
SYNCIN
1000
900
800
700
600
500
400
300
200
100
140
130
120
110
100
808
804
800
796
792
788
90
80
70
60
= 0V, R
-40
-40
50
VALLEY CURRENT-LIMIT THRESHOLD
100
-15
-15
FB REFERENCE VOLTAGE
RT
150 200 250
SWITCHING FREQUENCY
vs. TEMPERATURE
vs. TEMPERATURE
= 49.9kΩ, R
TEMPERATURE (°C)
TEMPERATURE (°C)
10
10
vs. R
R
RT
(kΩ)
300 350
RT
35
35
ILIM
R
ILIM
400
= 48.7kΩ,
60
60
= 48.7kΩ
450
500
85
85