ncp1596 ON Semiconductor, ncp1596 Datasheet - Page 4

• Manufacturer Part Number: ncp1596
• Description: 1.5 A, 1.5 Mhz Current Mode Pwm Buck Down Converter
• Manufacturer: ON Semiconductor

PIN FUNCTION DESCRIPTIONS
NCP1596
NCP1596A
Vin
EXTERNAL COMPONENT REFERENCE DATA
NCP1596A
NCP1596/
Pin #
Device
1
2
3
4
5
6
1
2
3
4
5
6
NC/EN
C1
VCC
FB
Symbol
Isense
VCCP
VCCP
V
3.3 V
2.5 V
1.5 V
1.2 V
GND
VCC
GND
VCC
NC
EN
FB
LX
FB
LX
OUT
500 nA
protect
CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
circuit
Short
Feedback pin. Part is internally compensated. Only necessary to place a voltage divider or connect the out-
put directly to this pin.
Ground
Pin connected internally to power switch. Connect externally to inductor.
Power connection to the power switch.
IC power connection.
No Connection
Feedback pin. Part is internally compensated. Only necessary to place a voltage divider or connect the out-
put directly to this pin.
Ground
Pin connected internally to power switch. Connect externally to inductor.
Power connection to the power switch.
IC power connection.
Device Enable pin. This pin has an internal current source pull up. No connect is enable the device. With this
pin pulled down below 0.8 V, the device is disabled and enters the shutdown mode.
Inductor Model
Shutdown
Soft Start
Thermal
0.8 V
UVLO
Figure 2. Detail Block Diagram
Inductor (L1)
http://onsemi.com
3.3 mH
3.3 mH
3.3 mH
3.3 mH
disable
Oscillator
4
Isense
MBRA210LT3G
MBRA210LT3G
MBRA210LT3G
MBRA210LT3G
S
R
Pin Description
Diode (D1)
Q
Q
Ton(min)
driver
22 mF x 2
22 mF x 2
22 mF x 2
22 mF x 2
C
22 mF
22 mF
22 mF
22 mF
IN
(C1)
GND
LX
VCCP
C
22 mF x 2
22 mF x 2
22 mF x 2
22 mF x 2
OUT
22 mF
22 mF
22 mF
22 mF
V
D1
out
(C2)
L1
= 0.8 V to 0.9 V * V
R1
R2
31 k
21 k
8 k
5 k
R1
C2
10 k
10 k
10 k
10 k
R2
in