NCP1596AMNTWG

NCP1596A
http://onsemi.com
4
PIN FUNCTION DESCRIPTIONS
Pin # Symbol Pin Description
1 FB Feedback pin. Part is internally compensated. Only necessary to place a voltage divider or connect the out-
put directly to this pin.
2 GND Ground
3 LX Pin connected internally to power switch. Connect externally to inductor.
4 VCCP Power connection to the power switch.
5 VCC IC power connection.
6 EN 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.
Figure 2. Detail Block Diagram
Oscillator
L1
C2
R1
R2
Soft Start
VCC
VCCP
EN
FB
LX
GND
C1
D1
S
R
Ton(min)
disable
driver
Thermal
Shutdown
UVLO
500 nA
0.8 V
Isense
Short
protect
Isense
Q
Q
V
out
= 0.8 V to 0.9 V * V
in
Vin
circuit
EXTERNAL COMPONENT REFERENCE DATA
V
OUT
Inductor Model Inductor (L1) Diode (D1) C
IN
(C1) C
OUT
(C2) R1 R2
3.3 V CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
3.3 mH
MBRA210LT3G
22 mF
22 mF x 2
22 mF
22 mF x 2
31 k 10 k
2.5 V CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
3.3 mH
MBRA210LT3G
22 mF
22 mF x 2
22 mF
22 mF x 2
21 k 10 k
1.5 V CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
3.3 mH
MBRA210LT3G
22 mF
22 mF x 2
22 mF
22 mF x 2
8 k 10 k
1.2 V CDC5D23 3R3 (1 A)
CDRH6D38 3R3 (1.5 A)
3.3 mH
MBRA210LT3G
22 mF
22 mF x 2
22 mF
22 mF x 2
5 k 10 k
NCP1596A
http://onsemi.com
5
Power up the
device
VCC > UVLO
Enable
Oscillator,
OTA and
NO
Disable the
Oscillator,
OTA and driver
Ramp up
Soft start
VCC
<
UVLO
Temperature
>
160 deg
YES
Normal
Operation
VCC > 3 V
Enable the
internal Vref
Temperature
<
130 deg
YES
NO
Current Limit
> 2.5 A
YES
Figure 3. Timing Diagram
Figure 4. State Diagram
VIN
VOUT
EN
TIME 1 ms/div
3.8 V
1 ms
1.8 V
0.4 V
EN
3.5 V
TIME 1 ms/div
driver
(1 ms)
YES
YES
5V
NCP1596A
http://onsemi.com
6
TYPICAL OPERATING CHARACTERISTICS
T
A
, AMBIENT TEMPERATURE (°C)
0.0
0.1
0.2
0.3
0.4
0.5
40 0 25 85
Figure 5. Switch ON Resistance vs.
Temperature
R
DS(on)
, SWITCH ON RESISTANCE (W)
Figure 6. Feedback Input Threshold vs.
Temperature
794
796
798
800
802
804
806
40 0 25 85
T
A
, AMBIENT TEMPERATURE (°C)
V
FB
, FB INPUT THRESHOLD (V)
Figure 7. Switching Frequency vs.
Temperature
1.44
1.46
1.48
1.50
1.52
1.54
1.56
40 0 25 85
T
A
, AMBIENT TEMPERATURE (°C)
F
OSC
, SWITCH FREQUENCY (MHz)
Figure 8. Main PFET Current Limit vs.
Temperature
0.5
1.0
1.5
2.0
2.5
3.0
3.5
40 0 25 85
T
A
, AMBIENT TEMPERATURE (°C)
I
LIM
, MAIN PFET CURRENT LIMIT (V)
450
470
490
510
530
550
40 0 25 85
T
A
, AMBIENT TEMPERATURE (°C)
I
CC
, QUIESCENT CURRENT INTO V
CC
(mA)
Figure 9. Quiescent Current Into V
CC
vs.
Temperature
250
300
350
400
450
500
40 0 25 85
I
CC+_SD
, SHUTDOWN QUIESCENT CURRENT (mA)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 10. Shutdown Quiescent Current vs.
Temperature

NCP1596AMNTWG

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Switching Controllers 1.5A BUCK DOWN CONVERTER
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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