ncp5173mn ON Semiconductor, ncp5173mn Datasheet - Page 4

• Manufacturer Part Number: ncp5173mn
• Description: 1.5 A 560 Khz-1.0 Mhz Boost Regulator
• Manufacturer: ON Semiconductor

3. Guaranteed by design, not 100% tested in production.
ELECTRICAL CHARACTERISTICS
PIN FUNCTION DESCRIPTION
Pin Number
General
Operating Current
Shutdown Mode Current
Minimum Operation Input Voltage
Thermal Shutdown
Thermal Hysteresis
1
2
3
4
5
6
7
8
Characteristic
Symbol
AGND
PGND
V
Test
V
SS
V
FB
SW
CC
C
Loop compensation pin. The V
pensation, current limit and soft−start. Loop compensation can be implemented by a simple RC
network as shown in the application diagram on Page 2 as R1 and C1.
Positive regulator feedback pin. This pin senses a positive output voltage and is referenced to
1.276 V. When the voltage at this pin falls below 0.4 V, chip switching frequency reduces to 20% of
the nominal frequency.
These pins are connected to internal test logic and should either be left floating or tied to ground.
Connection to a voltage between 2.0 V and 6.0 V shuts down the internal oscillator and leaves the
power switch running.
Synchronization and shutdown pin. This pin may be used to synchronize the part to nearly twice
the base frequency. A TTL low will shut the part down and put it into low current mode. If synchro-
nization is not used, this pin should be either tied high or left floating for normal operation.
Input power supply pin. This pin supplies power to the part and should have a bypass capacitor
connected to AGND.
Analog ground. This pin provides a clean ground for the controller circuitry and should not be in the
path of large currents. The output voltage sensing resistors should be connected to this ground pin.
This pin is connected to the IC substrate.
Power ground. This pin is the ground connection for the emitter of the power switching transistor.
Connection to a good ground plane is essential.
High current switch pin. This pin connects internally to the collector of the power switch. The open
voltage across the power switch can be as high as 40 V. To minimize radiation, use a trace as short
as practical.
(continued) (2.7 V < V
I
V
V
V
(Note 3)
(Note 3)
SW
C
C
SW
< 0.8 V, SS = 0 V, 2.7 V ≤ V
< 0.8 V, SS = 0 V, 12 V ≤ V
= 0
switching, maximum I
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Test Conditions
CC
< 30 V; 0°C < T
4
C
pin is the output of the error amplifier and is used for loop com-
SW
= 10 mA
CC
CC
≤ 30 V
≤ 12 V
J
Function
< 125°C; for all specifications unless otherwise stated.)
Min
150
−
−
−
−
−
2.45
Typ
180
5.5
12
25
−
Max
2.70
100
210
8.0
60
−
Unit
mA
mA
°C
°C
V