SI9145BQ-T1 Vishay, SI9145BQ-T1 Datasheet - Page 9

• Manufacturer Part Number: SI9145BQ-T1
• Description: IC, PWM CONTROLLER, 16-TSSOP
• Manufacturer: Vishay

Specifications of SI9145BQ-T1

• Primary Input Voltage: 7V
• No. Of Outputs: 1
• Output Voltage: 2.6V
• Output Current: 200mA
• No. Of Pins: 16
• Operating Temperature Range: -25°C To +85°C
• Power Dissipation Pd: 925mW
• Termination Type: SMD
• Number Of Outputs: Single Output
• Topology: Boost, Buck, Flyback, Forward
• Switching Frequency: 2000 KHz
• Duty Cycle (max): 100 %
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Package / Case: TSSOP-16
• Mounting Style: SMD/SMT
• Synchronous Pin: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Pin 9: R
This pin is the equivalent of a 1.0-V voltage source derived
from the on-chip V
connected from this pin to GND, a temperature independent
current is generated internally. This current is used as the
charging current source connected to the C
current is internally multiplied by 2 and is used as the
discharging current source connected to the C
Therefore, the external resistor is one of the factors that
determine the oscillator frequency.
Pin 10: C
An external capacitor is connected to this pin to set the
oscillator frequency.
charge and discharge the external capacitor. The oscillator
waveform is a symmetrical triangular type with a typical voltage
swing between 1.0 V and 1.5 V.
Pin 11: OTS
This pin indicates an over-temperature condition on the device
when the output is low. The output is latched low and is reset
with the ENABLE pin going low then high, or by turning power
off and on.
Document Number: 70021
S-40710—Rev. K, 19-Apr-04
f
OSC
OSC
OSC
]
R
OSC
REF
0.7
< C
. When a low T.C. resistor is externally
Internal current sources alternately
OSC
OSC
pin. The
OSC
pin.
Pin 12: ENABLE
A logic high on this pin allows normal operation. A logic low
places the chip in the standby mode. In standby mode normal
operation is disabled, supply current is reduced, the oscillator
stops and the output is held high for MODE SELECT = low, and
low for MODE SELECT = high.
Pin 13: UVLO
This pin will place the chip in the standby mode if the UVLO
voltage drops below 1.2 V.
exceeds 1.2 V, the chip operates normally. There is a built-in
hysteresis of 200 mV.
Pin 14: P
The negative return for the V
Pin 15: OUTPUT
This CMOS push-pull output pin drives the external MOSFET
and is capable of sinking 150 mA or sourcing 130 mA with V
equal to 2.7 V.
Pin 16: V
The positive terminal of the power supply which powers the
CMOS output driver. A bypass capacitor is required.
GND
S
SET
S
supply.
Once the UVLO
Vishay Siliconix
www.vishay.com
Si9145
SET
voltage
SET
S
9