SG2844DM Microsemi Analog Mixed Signal Group, SG2844DM Datasheet - Page 4

• Manufacturer Part Number: SG2844DM
• Description: IC PWM CURRENT MODE 8SOIC
• Manufacturer: Microsemi Analog Mixed Signal Group

Specifications of SG2844DM

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 50%
• Voltage - Supply: 8.2 V ~ 30 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -25°C ~ 85°C
• Package / Case: 8-SOIC
• Frequency-max: 500kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4
SG1844/SG1845 Series
Notes: 4. These parameters, although guaranteed, are not 100% tested in
Current Sense Section
Gain (Notes 5 & 6)
Maximum Input Signal (Note 5)
Power Supply Rejection Ratio (Note 5) PSRR
Input Bias Current
Delay to Output (Note 4)
Output Section
Output Low Level
Output High Level
Rise Time (Note 4)
Fall Time (Note 4)
Under-Voltage Lockout Section
Start Threshold
Min. Operation Voltage After Turn-On
PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
Power Consumption Section
Start-Up Current
Operating Supply Current
V
CC
Zener Voltage
5. Parameter measured at trip point of latch with V
production.
Parameter
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
E L E C T R I C A L C H A R A C T E R I S T I C S
Symbol
C
U R R E N T
P
R O D U C T I O N
V
12 ≤ V
I
I
I
I
T
T
1844
1845
1844
1845
V
I
SINK
SINK
SOURCE
SOURCE
CC
J
COMP
FB
J
= 25°C, C
= 25mA
= 25°C, C
= V
= 20mA
= 200mA
Test Conditions
= 5V
= 20mA
= 200mA
CC
ISENSE
- M
VFB
≤ 25V
= 0.
= 0V
L
L
O D E
= 1nF
= 1nF
P W M C
D
A T A
2.85
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
0.9
7.8
7.0
13
12
15
46
9
6. Gain defined as: A =
7. Adjust V
8. Output frequency equals one half of oscillator frequency.
O N T R O L L E R
SG1844/45
S
13.5
13.5
150
0.1
1.5
8.4
7.6
0.5
70
50
50
16
10
48
11
34
-2
3
1
H E E T
CC
3.15 2.85
300
150
150
-10
1.1
0.4
2.2
9.0
8.3
17
11
50
17
0
1
above the start threshold before setting at 15V.
(Cont'd.)
0.9
7.8
7.0
13
12
15
46
9
SG2844/45
13.5
13.5
150
0.1
1.5
8.4
7.6
0.5
70
50
50
16
10
48
11
34
∆ V
∆ V
-2
3
1
ISENSE
COMP
3.15 2.85
300
150
150
1.1
-10
0.4
2.2
9.0
8.2
17
11
50
17
0
1
; 0 ≤ V
14.5
0.9
7.8
8.5
7.0
13
12
46
SG3844/45
ISENSE
13.5
13.5
150
0.1
1.5
8.4
7.6
0.5
70
50
50
16
10
48
11
34
-2
3
1
≤ 0.8V.
3.15
17.5
11.5
300
150
150
1.1
-10
0.4
2.2
9.0
8.2
50
17
0
1
Copyright © 2000
Rev. 1.6c
Units
mA
mA
V/V
µA
dB
ns
ns
ns
%
%
V
V
V
V
V
V
V
V
V
V