el7558d Intersil Corporation, el7558d Datasheet - Page 8

• Manufacturer Part Number: el7558d
• Description: Integrated Adjustable 8 Amp Synchronous Switcher
• Manufacturer: Intersil Corporation

Pin Descriptions
I = INPUT, O = OUTPUT, S = SUPPLY
Block Diagram
PIN NUMBER
CREF, Pin 27
FB1, Pin1
FB2, Pin 28
VCCDET, Pin 13
CSLOPE, Pin 3
OUTEN, Pin 14
COSC, Pin 4
21
22
23
24
25
26
27
28
VDD
PIN NAME
VSS
C2V
1.26V
FB2
VHI
CP
LX
LX
LX
(Continued)
4V
+
+
-
-
8
UVLO
TYPE
PIN
O
O
O
S
O
I
I
I
S
R
2-1 MUX
Same as pin 20.
Same as pin 20.
Same as pin 20.
Gate drive to high-side driver. Bootstrapped from LX with a 0.1µF capacitor.
Ground return for the control circuitry.
Connected to voltage doubler output. Supplies gate drive to the low-side driver.
Drives the negative side of charge pump capacitor at one-half the oscillator frequency F
Voltage feedback pin. Active when VCC2DET is logic 1. Internally preset to V
+
-
6
VDD
Current Limit
R
EL7558D
SS
+
+
-
-
+
+
Current Sense
-
-
C
SS
PWM
+
-
LEB T
FUNCTION
R
S
R
DELAY
FF
Q
Q
S
Over Temp Sensor
V2X
Zero Cross Detect
+
-
OUT
= 3.5V.
PWRGD, Pin 16
CP, Pin 27
C2V, Pin 26
VHI, Pin 24
VDD and VIN,
Pin 5,6,8
LX, Pin 20-23
VSSP, Pin 9-
12, 18-19
OT, Pin 15
V
SS,
Pin 25
OSC
.