Si9168
New Product
Vishay Siliconix
Synchronous Buck or Boost Controller for 2-Cell Li+ Battery
Operated Portable Communication Devices
FEATURES
D
D
D
D
Voltage Mode Control
5-V to 10-V Input Voltage Range for V
DD
5-V to 12.6-V Input Voltage Range for V
S
– Boost
Programmable PWM/PSM Control
– Up to 2-MHz Switching Frequency in PWM
– Synchronous Rectification in PWM
– Less than 350-mA I
DD
in PSM
Very High Efficiencies In Buck or Boost Modes
Low Dropout Operation at 100% Duty Cycle In Buck
Mode
Integrated UVLO and POR
Integrated Soft-Start
Synchronization
D
Logic Controlled Micropower Shutdown Current <2
mA
D
Fast Line and Load Transient Response
D
Available in 16-Lead TSSOP Package
APPLICATIONS
D
D
D
D
D
D
Cellular Telephones
Wireless Modems
Portable Instruments
Notebook and Palmtop Computers
PDA’s
Battery Operated Devices
D
D
D
D
D
DESCRIPTION
The Si9168 is a synchronous buck or boost controller for 2-cell
Li+ battery operated portable communication devices.
Designed for use with external high-frequency MOSFETs, the
Si9168 is ideal for providing power to various power amplifiers
such as TDMA, CDMA, GSM, or PCS. For ultra-high efficiency,
converters are designed to operate in synchronous rectified
PWM mode under full load, while transforming into externally
controlled pulse skipping mode (PSM) under light load
conditions. All these features are provided by Si9168 without
sacrificing system integration requirements of fitting these
circuits into ever demanding smaller space. The Si9168 is
capable of switching up to 2 MHz to minimize the size of the
output inductor and capacitor, in order to decrease the overall
converter footprint. The programmability to design a buck or
boost converter with this IC makes it convenient to power
either the high voltage (7.2-V) or low voltage (4-V) PAs.
The Si9168 is available in TSSOP-16 pin package and
specified to operate over the industrial temperature range of
–25_C to 85_C.
FUNCTIONAL BLOCK DIAGRAM
V
IN
(5 – 10 V)
V
IN
(5 – 10 V)
1.3 V
X
10 V
SMPS
V
OUT
(1.3
X
10 V)
V
OUT
(5
X
12.6 V)
5 V
X
12.6 V
SMPS
1.3 V
Voltage Reference
Shutdown
Control
V
REF
(1.3 V)
1.3 V
Voltage Reference
Shutdown
Control
V
REF
(1.3 V)
SD
SD
Buck Mode
Document Number: 70899
S-00022—Rev. A, 10-Jan--00
Boost Mode
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Si9168
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to AGND
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 V
V
SS
–V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 V
PWM/PSM, SYNC, SD, V
REF
, R
OSC
, COMP, FB, Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to V
DD
+ 0.3 V
V
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to V
S
+ 0.3 V
PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ."0.3V
Voltages Referenced to PGND
V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 V
D
H
, D
L
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to V
S
+ 0.3 V
Peak Output Current (D
H
, D
L
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–65 to 150_C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C
Power Dissipation (Package)
a
16-Pin TSSOP (Q Suffix)
b
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 925 mW
Thermal Impedance (Q
JA
)
16-Pin TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135_C/W
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.4 mW/_C above 25_C.
New Product
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE
Voltages Referenced to AGND
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V to 10 V
F
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 kHz to 2 MHz
R
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 kW to 300 kW
PWM/PSM, SYNC, SD, Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to V
DD
V
REF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.1
mF
Voltages Referenced to PGND
V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0 V to 10 V (Buck)
V
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0 V to 12.6 V (Boost)
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
Parameter
Reference
Output Voltage
V
REF
Current
Power Supply Rejection
V
REF
I
REF
P
SRR
I
REF
= 0 A
V
DD
= 7.2 V, 25_C
1.268
1.280
–500
60
1.3
1.3
1.332
1.320
V
mA
dB
Limits
–25_C to 85_C
Symbol
5 V
v
V
DD
, V
S
v
10 V
Min
a
Typ
b
Max
a
Unit
UVLO
Under Voltage Lockout
(Turn-On)
Hysteresis
V
UVLO/LH
V
HYS
4.3
4.5
0.2
4.7
V
Soft-Start Time
SS Time
t
SS
3
ms
SD, SYNC, PWM/PSM
Logic High
Logic Low
Input Current
V
IH
V
IL
I
L
–1.0
2.4
0.8
1.0
V
mA
Mode
Logic High
Logic Low
Input Current
V
IH
V
IL
I
L
–1.0
70% V
DD
30% V
DD
1.0
V
mA
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Document Number: 70899
S-00022—Rev. A, 10-Jan--00
Si9168
New Product
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
Parameter
Oscillator
Maximum Frequency
Accuracy
Maximum Duty Cycle
(Buck, Non LDO Mode)
Maximum Duty Cycle (Boost)
SYNC Range
SYNC Low Pulse Width
SYNC High Pulse Width
SYNC t
r
, t
f
t
r
, t
f
F
SYNC
/F
OSC
D
MAX
F
MAX
1% External Resistor
F
SW
= 2 MHZ
R
OSC
= 130 kW, V
DD
= 5 V, V
S
= 12.6 V
2
–20
75
65
1.2
50
50
50
ns
80
71
1.5
20
%
MHz
Vishay Siliconix
Limits
–25_C to 85_C
Symbol
5 V
v
V
DD
, V
S
v
10 V
Min
a
Typ
b
Max
a
Unit
Error Amplifier
Input Bias Current
Open Loop Voltage Gain
Offset Voltage
Unity Gain BW
Output Current (Source)
Output Current (Sink)
Power Supply Rejection
I
BIAS
A
VOL
V
OS
BW
I
EA
P
SRR
V
FB
= 1.05 V
V
FB
= 1.55 V
1
V
FB
= 1.4 V
–1
50
–10
2
–2
3
60
–1
60
10
1
mA
dB
mV
MHz
mA
dB
PSM Modulator
Switch On Time
Switch Off Blanking Time
t
ON
t
OFF
V
DD
= 7.2 V, V
OUT
= 3.3 V, Buck Mode
180
330
ns
Output Drive (D
H
and D
L
)
Output High Voltage
Output Low Voltage
Peak Output Source
Peak Output Sink
Break-Before-Make
V
OH
V
OL
I
SOURCE
I
SINK
t
BBM
V
S
= 7.2 V, I
OUT
= –20 mA
V
S
= 7.2 V, I
OUT
= 20 mA
V
S
= 7.2 V, D
H
= D
L =
V
S
/2
V
S
= V
DD
= 10 V
500
7.08
7.14
0.06
–1000
1000
40
0.12
–500
V
mA
ns
Supply
Normal Mode
PSM Mode
Shutdown Mode
I
DD
V
DD
= 7.2 V, f
OSC
= 2 MHz
V
DD
= 7.2 V
V
DD
= 7.2 V, SD = 0 V
1100
350
2.0
mA
A
Notes
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
b. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing.
c. Guaranteed by design and characterization, not subject to production testing.
Document Number: 70899
S-00022—Rev. A, 10-Jan--00
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Si9168
Vishay Siliconix
New Product
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
V
REF
vs. V
DD
1.310
1.308
1.306
1.304
V
REF
(V)
V
REF
(V)
1.302
1.300
1.298
1.296
1.294
1.292
1.29
4
6
8
10
12
14
1.320
1.316
1.312
1.308
1.304
1.300
1.296
1.292
1.288
1.284
1.28
–50
V
DD
= 7.2 V
V
REF
vs. Temperature
–25
0
25
50
75
100
V
DD
– (V)
Temperature (_C)
Frequency vs. Temperature
2.2
V
DD
= 7.2 V
R
OSC
= 25 kW
10000
Frequency vs. R
OSC
2.1
Frequency (MHz)
2.0
Frequency (kHz)
1000
1.9
1.8
1.7
–50
0
50
Temperature (_C)
100
100
10
100
R
OSC
(kW)
1000
Max Duty Cycle vs. Frequency (Buck Mode)
98
V
IN
= 7.2 V
94
90
86
82
78
74
70
400
74
70
66
% Max Duty Cycle
62
58
54
50
46
Max Duty Cycle vs. Frequency (Boost Mode)
V
IN
= 7.2 V
% Max Duty Cycle
600
800 1000 1200 1400 1600 1800 2000 2200
Frequency (kHz)
42
400
600
800 1000 1200 1400 1600 1800 2000 2200
Frequency (kHz)
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Document Number: 70899
S-00022—Rev. A, 10-Jan--00
Si9168
New Product
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
PWM Supply Current vs. V
DD
(Buck Mode)
1400
F
OSC
= 1.6 MHz
1200
1200
1400
F
OSC
= 1.6 MHz
Vishay Siliconix
PWM Supply Current vs. V
DD
(Boost Mode)
1000
I
DD
(
(m
A)
I
DD
(
(mA)
4
6
8
10
12
14
1000
800
800
600
600
400
400
200
V
DD
– (V)
200
4
6
8
10
V
DD
– (V)
12
14
PSM Supply Current vs. V
DD
(Buck Mode)
300
300
PSM Supply Current vs. V
DD
(Boost Mode)
250
250
I
DD
(
(mA)
150
I
DD
(
(mA)
4
6
8
10
12
14
200
200
150
100
100
50
V
DD
– (V)
50
4
6
8
10
V
DD
– (V)
12
14
100
Efficiency —Buck, V
OUT
= 3.6 V
PSM = 5 V
IN
100
Efficiency —Boost, V
OUT
= 7.2 V
90
Efficiency (%)
Efficiency (%)
PWM = 5 V
IN
80
PWM = 7.2 V
IN
PSM = 7.2 V
IN
70
PSM = 8.4 V
IN
60
PWM = 8.4 V
IN
90
PSM: 5.4 V
IN
80
PSM: 6.0 V
IN
PSM: 7.0 V
IN
70
PWM: 5.4 V
IN
PWM: 6.0 V
IN
PWM: 7.0 V
IN
60
50
10
100
1000
10000
50
10
100
1000
10000
Load Current (mA)
Load Current (mA)
Document Number: 70899
S-00022—Rev. A, 10-Jan--00
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