ML4818
PIN CONNECTION
24-Pin Power DIP
24-Pin SOIC
GND
1
2
24
23
22
21
20
19
18
17
16
15
14
13
V
REF
GND
1
24
23
22
21
20
19
18
17
16
15
14
13
V
REF
C
GND
T
C
2
GND
T
RAMP
3
B1 OUT
B2 OUT
RAMP
3
B1 OUT
B2 OUT
I
4
LIM
E/A OUT
GND
5
V
CC
I
4
LIM
6
GND
E/A OUT
GND
5
V
CC
GND
7
GND
6
GND
INV
8
A1 OUT
A2 OUT
GND
GND
7
GND
SOFT START
SHUTDOWN
9
10
11
12
INV
8
A1 OUT
A2 OUT
GND
R
R
DELAY
T
SOFT START
SHUTDOWN
9
RC
CLOCK
RESET
10
11
12
R
T
R
TOP VIEW
DELAY
RC
CLOCK
RESET
TOP VIEW
PIN DESCRIPTION
PIN NAME
FUNCTION
PIN NAME
FUNCTION
1
2
3
GND
Ground
12 RC
Timing elements for Integrating fault
detection and reset delay circuits
RESET
C
T
Timing capacitor for oscillator
13 CLOCK
14
Oscillator output
RAMP
Non-inverting input to main
comparator. Connected to current
sense resistor for current mode
R
DELAY
Resistor to ground on this pin
programs the amount of delay from
the time an output turns off until its
complementary output turns on
4
5
I
Current limit sense pin. Normally
connected to current sense resistor
LIM
15 GND
16 A2 OUT
17 A1 OUT
18,19 GND
Ground
E/A OUT
Output of error amplifier and input
to PWM comparator
High current totem pole output A1
High current totem pole output A2
Ground and substrate
6,7 GND
Ground and substrate
8
9
INV
Inverting input to error amp
SOFT START Normally connected to soft start
capacitor
20
V
CC
Positive supply for the IC
High current totem pole output B1
High current totem pole output B2
Ground
21 B2 OUT
22 B1 OUT
23 GND
10 SHUTDOWN Pulling this pin low puts the IC into
a power down mode and turns off
all outputs. This pin is internally
pulled up to V
.
REF
11
R
T
Resistor which sets discharge
current for oscillator timing
capacitor
24
V
REF
Buffered output for the 5V voltage
reference
2
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
