NCP1521B Datasheet, PDF (3/14 Pages) ON Semiconductor – 1.5 MHz, 600 mA Step−Down DC−DC Converter

NCP1521B
PIN FUNCTION DESCRIPTION
Pin No.
TSOP5
Pin No.
UDFN6
Pin Name
1
3
VIN
2
2, 4
GND
3
1
EN
4
6
FB
5
5
LX
Type
Analog /
Power Input
Analog /
Power Ground
Digital Input
Analog Input
Analog Output
Description
Power supply input for the PFET power stage, analog and digital blocks. The
pin must be decoupled to ground by a 4.7 mF ceramic capacitor.
This pin is the GND reference for the NFET power stage and the analog sec-
tion of the IC. The pin must be connected to the system ground.
Enable for switching regulators. This pin is active HIGH and is turned off by
logic LOW on this pin. Do not left this pin floating.
Feedback voltage from the output of the power supply. This is the input to the
error amplifier.
Connection from power MOSFETs to the Inductor.
PIN CONNECTIONS
VIN 1
5 LX
GND 2
EN 3
4 FB
(Top View)
Figure 5. Pin Connections − TSOP5
EN 1
GND 2
VIN 3
6 FB
5 LX
4 GND
Figure 6. Pin Connections − UDFN6
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Minimum Voltage All Pins
Maximum Voltage All Pins (Note 2)
Maximum Voltage Enable, FB, LX
Thermal Resistance, Junction −to−Air
(with Recommended Soldering Footprint)
TSOP5
UDFN6
V_min
V_max
V_max
R_qJA
−0.3
7.0
VIN + 0.3
300
260
V
V
V
°C/W
Operating Ambient Temperature Range
Storage Temperature Range
Junction Operating Temperature
Latch−up Current Maximum Rating (T_A = 85°C) (Note 4)
ESD Withstand Voltage (Note 3)
Human Body Model
Machine Model
T_A
T_stg
T_j
Lu
V_esd
−40 to 85
°C
−55 to 150
°C
−40 to 125
°C
$100
mA
2.0
kV
200
V
Moisture Sensitivity Level (Note 5)
MSL
1
per IPC
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Maximum electrical ratings are defined as those values beyond which damage to the device may occur at T_A = 25°C.
2. According to JEDEC standard JESD22−A108B.
3. This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM) per JEDEC standard: JESD22−A114.
Machine Model (MM) per JEDEC standard: JESD22−A115.
4. Latchup current maximum rating per JEDEC standard: JESD78.
5. JEDEC Standard: J−STD−020A.
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