SI9161BQ-T1 Vishay, SI9161BQ-T1 Datasheet - Page 6

• Manufacturer Part Number: SI9161BQ-T1
• Description: IC, VOLTAGE MODE PWM CTRL, 6V, TSSOP-16
• Manufacturer: Vishay

Specifications of SI9161BQ-T1

• Input Voltage: 6V
• Output Voltage: 5.2V
• Output Current: 10mA
• Frequency: 2MHz
• Power Dissipation Pd: 925mW
• Supply Voltage Range: 2.7V To 6V
• Digital Ic Case Style: TSSOP
• No. Of Pins: 16
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-16
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Si9161
Vishay Siliconix
PIN CONFIGURATIONS
PIN DESCRIPTION
Pin 1: V
The positive power supply for all functional blocks except
output driver. A bypass capacitor of 0.1 µF (minimum) is
recommended.
Pin 2: LL
A logic high on this pin allows normal operation. A logic low
places the chip in light-load optimized-efficiency mode. In
light-load mode, the oscillator frequency is reduced and D
goes high, disabling synchronous rectification. Do not leave
pin unconnected.
Pin 3: D
Used to set the maximum duty cycle.
Pin 4: COMP
This pin is the output of the error amplifier. A compensation
network is connected from this pin to the FB pin to stabilize
the system. This pin drives one input of the internal pulse
width modulation comparator.
Pin 5: FB
The inverting input of the error amplifier. An external resistor
divider is connected to this pin to set the regulated output
voltage. The compensation network is also connected to this
pin.
Pin 6: NI
The non-inverting input of the error amplifier. In normal
operation it is externally connected to V
reference.
Pin 7: V
This pin supplies a 1.5-V reference.
S-60752—Rev. B, 05-Apr-99
6
DD
REF
MAX
REF
or an external
R
Pin 8: GND (Ground)
Pin 9: 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 D
Pin 10: R
A resistor connected from this pin to ground sets the
oscillator’s capacitor (C
See the oscillator section of the description of operation.
Pin 11: C
An external capacitor is connected to this pin to set the
normal oscillator frequency.
Pin 12: UVLO
This pin will place the chip in the standby mode if the
UVLO
voltage exceeds 1.2 V, the chip operates normally. There is a
built-in hysteresis of 200 mV.
Pin 13: P
The negative return for the V
Pin 14: D
This CMOS push-pull output pin drives the external n-channel
MOSFET. This pin will be low in the standby mode. A break-
before-make function between D
f
OSC
SET
GND
OSC
OSC
S
----------------------------------- -
R
voltage drops below 1.2 V. Once the UVLO
OSC
S
0.70
SET
goes low while D
C
OSC
OSC
FaxBack 408-970-5600, request 70747
) charge and discharge current.
S
supply.
R
S
goes high.
and D
(at V
R
is built-in.
DD
www.siliconix.com
= 5.0 V)
SET