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NCP1550SN33T1 Datasheet(PDF) 2 Page - ON Semiconductor

Part # NCP1550SN33T1
Description  600 kHz PWM/PFM Step-Down DC-DC Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

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NCP1550
http://onsemi.com
2
VOUT
3
GND
2
M1
+
Voltage Reference
and Soft−Start
A1
TON t
TON(PFM)
PWM
Controller
Driver
600 kHz
Oscillator
4
1
EXT
CE
+
CP1
2.2 V
+
UVLO
5
VIN
Figure 1. Simplified Block Diagram
PIN FUNCTION DESCRIPTIONS
Pin
Symbol
Description
1
CE
Chip Enable pin, active high (internal pullup current source). By connecting this pin to GND, the switching operation
of the controller will be stopped.
2
GND
Ground Connection
3
VOUT
Output voltage monitoring input. This pin must be connected to the regulated output node as a feedback to on−chip
control circuitry. VOUT is internally connected to the on−chip voltage divider that determines the output voltage level.
4
EXT
Gate drive for external P−MOSFET
5
VIN
Power supply input
MAXIMUM RATINGS (TA = 25°C unless otherwise noted)
Rating
Symbol
Value
Unit
Device Power Supply, VIN (Pin 5)
VIN
−0.3 to 6.0
V
Input/Output Pins
CE (Pin 1)
VOUT (Pin 3)
EXT (Pin 4)
VCE
VOUT
VEXT
−0.3 to 6.0
−0.3 to 6.0
−0.3 to 6.0
V
Thermal Characteristics
TSOP−5 Plastic Package, Case 483−01
Thermal Resistance, Junction−to−Air
RqJA
250
°C/W
Operating Junction Temperature Range
TJ
−40 to +150
°C
Operating Ambient Temperature Range
TA
−40 to +85
°C
Storage Temperature Range
Tstg
−55 to +150
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
NOTE:
ESD data available upon request.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM)
$2.0 kV per JEDEC standard: JESD22−A114.
Machine Model (MM)
$200V per JEDEC standard: JESD22−A115.
2. Latchup Current Maximum Rating: 150 mA per JEDEC standard: JESD78.
3. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J−STD−020A.


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