SI9160BQ-T1 Vishay, SI9160BQ-T1 Datasheet - Page 8

• Manufacturer Part Number: SI9160BQ-T1
• Description: IC, VOLTAGE MODE PWM CTRL, 6V, TSSOP-16
• Manufacturer: Vishay

Specifications of SI9160BQ-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

Si9160
Vishay Siliconix
OPERATION OF THE SI9160 BOOST CONVERTER
The Si9160 combined with optimized complementary
MOSFETs provides the ideal solution to small, high efficiency,
synchronous boost power conversion. Optimized for a 1-cell
lithium ion, or 3-cell to 4-cell Nickel metal hydride battery, it is
capable of switching at frequencies of up to 2 MHz. Combined
with the Si6801, a complimentary high-frequency MOSFET,
efficiencies of over 90% are easily achieved in a very small
area.
PWM Controller
The Si9160 implements a synchronous voltage mode PWM
control topology and is especially designed for battery power
conversion. Voltage-mode control results in the most efficient
power conversion solution. Figure 1 below illustrates a
schematic for a synchronous boost converter with an input
range of 2.7 V to 5 V which covers the range of 1-cell LiIon and
3-cell or 4-cell NiMH/NiCd battery input respectively, and an
output voltage of 6 V. Note the maximum input voltage is limited
to the output voltage for a boost converter.
The switching frequency is determined by an external
capacitor and resistor connected to C
graph on page 5 in the Typical Characteristics section shows
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8
SYNC
1-Cell
LiIon
C6
22 pF
R4
2.2 k
C10
0.33 mF
C4
0.1
mF
C3
0.1 mF
R2, 270 W
R1
10 k
0.1 mF
C2
0.1 mF
C5
R3
2.2 k
osc
1
2
3
4
5
6
7
8
LS4148
FB
V
NC
D
COMP
NI
V
GND
and R
DD
REF
MAX
D1
FIGURE 1. Si9160 Boost Converter
Si9160
osc
UVLO
ENABLE
pins. The
C
R
P
GND
OSC
OSC
SET
V
D
D
D2
LS4148
12 k
S
R
S
R6
16
15
14
13
12
11
10
9
100 k
R5
C11
36 pF
C10
0.1 mF
the typical C
frequency. Si9160 oscillator frequency can be easily
synchronized to external frequency as long as external
switching frequency is higher than the internal oscillator
frequency. The synchronization circuit is a series resistor and
capacitor fed into the C
synchronization pulse should be greater than 1.5 V in
amplitude and a near square wave pulsed clock. Figure 1
shows typical values for the synchronization components.
Startup
Designed to operate with single cell Lithium Ion battery
voltage, the Si9160 has an operating range of 2.7 V to 6.0 V.
During start-up, the device requires 3.0 V to guarantee proper
operation, although it will typically start up at less than 2.2 V.
Once powered, Si9160 will continue to operate until the
voltage at V
dead. During start-up, power for the chip is provided by the
battery through schottky diode D1 to V
the converter is fully operating, supply power is provided by the
converter output through diode D2, which overrides the D1
diode. This self perpetuating method of powering further
improves the converter efficiency by utilizing higher gate drive
to lower the on-resistance loss of the MOSFET.
ML
C1
10 mF
R9
100 W
C8
5600 pF
DD
ML
C2
10 mF
osc
is 2.7 V; at this point, the battery is basically
1
2
3
4
R10
3.6 k
R11
1.2 k
D1
S1
S1
G1
and R
Si6801
C9
0.1 mF
G2
D2
S2
S2
4.7 mH
osc
8
7
6
5
osc
values for various switching
ML
C3
10 mF
pin of the Si9160. The
ML
C4
10 mF
S-40700—Rev. H, 19-Apr-04
DD
Document Number: 70029
and V
Amplifier
Power
S
pins. Once