概述
数据手册SI9165 概述
High Frequency 600-mA Synchronous Buck/Boost Converter 高频600毫安同步降压/升压转换器
SI9165 数据手册
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PDF下载Si9165
Vishay Siliconix
High Frequency 600-mA Synchronous Buck/Boost Converter
FEATURES
D Voltage Mode Control
D Integrated UVLO and POR
D Integrated Soft-Start
D Synchronization
D Fully Integrated MOSFET Switches
D 2.7-V to 6-V Input Voltage Range
D Programmable PWM/PSM Control
D Shutdown Current <1 mA
− Up to 600-mA Output Current @ 3.3 V in PWM
− Up to 2-MHz Adjustable Switching Frequency in PWM
− Less than 200-mA Quiescent Current in PSM
DESCRIPTION
The Si9165 provides fully integrated synchronous buck or
boost converter solution for the latest one cell Lithium Ion
cellular phones. Capable of delivering up to 600 mA of output
current at +3.3 V, the Si9165 provides ample power for various
baseband circuits as well as for some PAs. It combines the
2-MHz switching controller with fully integrated high-frequency
MOSFETs to deliver the smallest and most efficient converter
available today. The 2-MHz switching frequency reduces the
inductor height to new level of 2 mm and minimizes the output
capacitance requirement to less than 10 mF with peak-to-peak
output ripple as low as 10 mV. Combined with low-gate charge
high-frequency MOSFETs, the Si9165 delivers efficiency up to
95%. The programmable pulse skipping mode maintains this
high efficiency even during the standby and idle modes to
increase overall battery life and talktime. In order to extract the
last ounce of power from the battery, the Si9165 is designed
with 100% duty cycle control for buck mode. With 100% duty
cycle, the Si9165 operates like a saturated linear regulator to
deliver the highest potential output voltage for longer talktime.
The Si9165 is available in both standard and lead (Pb)-free
TSSOP-20 pin packages. In order to satisfy the stringent
ambient temperature requirements, the Si9165 is rated to
handle the industrial temperature range of −25_C to 85_C.
STANDARD APPLICATION CIRCUITS
V
V
OUT
0 X 600 mA
IN
2.7 X 6 V
V
IN
2.7 X 6 V
V
V
V
V
V
S
IN/OUT
O
OUT
V
COIL
V
V
O
0 X 600 mA
DD
COIL
MODE
V
S
PGND
FB
DD
IN/OUT
FB
MODE
COMP
SHUTDOWN COMP
SHUTDOWN
PWM/PSM
R
OSC
PWM/PSM
SYNC
R
OSC
REF
GND
REF
SYNC
PGND
PGND GND
Boost Configuration
Buck Configuration
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
www.vishay.com
1
Si9165
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND
Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65 to 150_C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V
MODE, PWM/PSM, SYNC, SD,
V
, R
COMP, FB . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to V +0.3 V
a
REF OSC DD
Power Dissipation (Package)
V
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to V +0.3 V
b
S
20-Pin TSSOP (Q Suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 W
PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "0.3 V
Thermal Impedance (Θ
)
JA
Voltages Referenced to PGND
20-Pin TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125_C/W
V , V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V
S
IN/OUT
Notes
COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.4 V to V
+0.4 V
a. Device mounted with all leads soldered or welded to PC board.
IN/OUT
b. Derate 8.0 mW/_C above 25_C.
Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A
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 CONDITIONS
Voltages Referenced to GND
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7 V to 6 V
F
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 kHz to 2 MHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 kW to 300 kW
Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 mF
DD
osc
MODE, PWM/PSM, SYNC, SD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to V
Voltages Referenced to PGND
R
DD
osc
V
REF
V , V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7 V to 6 V
S
IN/OUT
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
Limits
2.7 V <
IN/OUT
V
< 6V,
S
DD
Symbol
Mina
Typb Maxa
Unit
V
= 3.3 V, V = 3.3 V
Parameter
Reference
I
= 0
1.268
1.280
1.3
1.3
3
1.332
1.320
REF
Output Voltage
V
V
REF
T
A
= 25°C, I
= 0
REF
Load Regulation
DV
V
DD
= 3.3 V, −500 µA < I <0
REF
mV
dB
REF
Power Supply Rejection
P
SRR
60
UVLO
Under Voltage Lockout (turn-on)
Hysteresis
V
2.3
2.4
0.1
2.5
UVLOLH
V
V
HYS
V
− V
UVLOLH UVLOHL
Soft-Start Time
SS time
tss
6
ms
Mode
Logic High
Logic Low
V
0.7 V
DD
IH
V
V
0.3 V
DD
IL
L
Input Current
I
−1.0
1.0
mA
SD, SYNC, PWM/PSM
Logic High
V
2.4
IH
V
Logic Low
V
0.8
1.0
IL
L
Input Current
I
−1.0
mA
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
www.vishay.com
2
Si9165
Vishay Siliconix
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
Limits
2.7 V <
IN/OUT
V
< 6V,
S
DD
Symbol
V
= 3.3 V, V = 3.3 V
Mina
Typb Maxa
Unit
Parameter
Oscillator
Maximum Frequency
Accuracy
F
2
MHz
%
MAX
Nominal 1.60 MHz, R
= 30 kW
−20
75
20
OSC
Max Duty Cycle (Buck, Non LDO Mode)
Max Duty Cycle (Boost)
SYNC Range
85
65
1.5
D
Fsw = 2 MHz
MAX
50
F
/F
1.2
50
SYNC OSC
SYNC Low Pulse Width
SYNC High Pulse Width
50
ns
SYNC t , t
50
r
f
Error Amplifier
Input Bias Current
I
V
FB
= 1.5 V
−1
50
1
mA
BIAS
Open Loop Voltage Gain
A
60
dB
VOL
T
A
= 25_C
1.270
1.258
1.30
1.30
2
1.330
1.342
FB Threshold
Unity Gain BW
V
V
FB
BW
MHz
Source (V = 1.05 V), V
= 0.75 V
−3
3
−1
FB
COMP
Output Current
I
EA
mA
Sink (V = 1.55 V), V
= 0.75 V
1
FB
COMP
Output Current
Output Current (PWM)
c
c
Boost Mode
V
V
v V
w V
= 2.7 to 5.0 V
= 2.7 to 6.0 V
600
600
150
150
IN
OUT
d
Buck Mode
Boost Mode
IN
OUT
I
mA
OUT
V
= 3.3 V, V
= 3.6 V
= 2.7 V
IN
OUT
OUT
Output Current (PSM)
d
Buck Mode
V
= 3.6 V, V
IN
r
r
N-channel
P-channel
130
160
300
330
DS(on)
DS(on)
r
V
S
w 3.3 V
mW
DS(on)
Over temperature protection
Trip Point
Rising Temperature
165
25
°C
mA
Hysteresis
Supply Current
Normal Mode
PSM Mode
V
= 3.3 V, F
= 2 MHz
500
180
750
250
1
DD
OSC
V
DD
= 3.3 V
I
DD
Shutdown Mode
V
DD
= 3.3 V, SD = 0 V
Notes
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
c.
d.
V
IN
V
IN
= V
V
= V
= V = V , L = 1.5 mH
DD, OUT
IN/OUT S O
= V = V = V
, V
= V , L = 1.5 mH
DD
S
IN/OUT OUT O
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
www.vishay.com
3
Si9165
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS OTHERWISE NOTED)
V
vs. V
V
REF
vs. Temperature
REF
DD
1.310
1.305
1.300
1.295
1.290
1.32
1.31
1.30
1.29
1.28
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
−50
0
50
100
150
V
DD
− (V)
Temperature (_C)
Frequency vs. Temperature
Frequency vs. R
OSC
10000
1000
100
2.00
1.95
1.90
1.85
1.80
1.75
1.70
R
OSC
= 25 kW
−100
−50
0
50
100
150
10
100
1000
Temperature (_C)
R
OSC
(kW)
Buck Mode Efficiency, V = 2.7 V
Boost Mode Efficiency, V = 3.6 V
O
O
100
95
95
90
PWM−2.7 V
PWM−3.3 V
PSM−3 V
90
85
85
80
PSM−3.6 V
PSM−4.2 V
PSM−3.3 V
PSM−2.7 V
PWM−3 V
80
75
70
PWM−3.6 V
75
70
PWM−4.2 V
65
60
65
60
10
100
10
100
1000
1
1000
1
Load Current (mA)
Load Current (mA)
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
www.vishay.com
4
Si9165
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS OTHERWISE NOTED)
PWM Supply Current
PSM Supply Current
800
700
600
500
400
300
200
250
200
150
100
50
2
3
4
5
6
7
2
3
4
5
6
7
V
DD
− (V)
V
DD
− (V)
PIN CONFIGURATION AND ORDERING INFORMATION
TSSOP-20
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
SD
COIL
COIL
Ordering Information
Temperature Range
PWM/PSM
MODE
PGND
PGND
Part Number
Package
V
V
V
IN/OUT
IN/OUT
Si9165BQ-T1
−25 to 85_C
Tape and Reel
Si9165BQ
Si9165BQ-T1—E3
V
V
V
IN/OUT
SYNC
GND
S
O
DD
Eval Kit
Temperature Range
Board Type
V
R
OSC
COMP
REF
FB
Si9165DB
−25 to 85_C
Surface Mount
Top View
PIN DESCRIPTION
Pin
Symbol
Description
1
N/C
SD
Not Used
2
3
Shuts down the IC completely and decreases current consumed by the IC to <1 mA.
Logic high = PWM mode, logic low = PSM mode. In PSM mode, synchronous rectification is disabled.
Input node for buck mode and output node for boost mode.
PWM/PSM
4, 5, 6
V
IN/OUT
Externally controlled synchronization signal. Logic high to low transition forces the clock synchronization. If not used, the
7
SYNC
GND
pin must be connected to V , or logic high.
DD
8
9
Low power controller ground
V
REF
1.3-V reference. Decoupled with 0.1-mF capacitor.
Output voltage feedback connected to the inverting input of an error amplifier.
Error amplifier output for external compensation network.
External resistor to determine the switching frequency.
Input supply voltage for the analog circuitry. Input voltage range is 2.7 V to 6 V.
Direct output voltage sensing to control peak inductor current in PSM mode.
Supply voltage for the internal MOSFET drive circuit.
Power ground.
10
FB
11
COMP
Rosc
12
13
V
DD
14
V
O
15
V
S
16, 17
18
PGND
MODE
COIL
Determines the converter topology. Connect to AGND for buck or V for boost.
DD
19, 20
Inductor connection node
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
www.vishay.com
5
Si9165
Vishay Siliconix
FUNCTIONAL BLOCK DIAGRAM
V
DD
SD
V
S
V
IN/OUT
Positive
Supply
Reference
Bias
Generator
Soft-Start
Timer
UVLO
POR
OTP
Threshold
Generator
V
REF
FB
COMP
PWM
Modulator
P
N
PWM
IN
1.0 V
Ramp
PWM
EN
COIL
0.5 V
Drivers
SYNC
PWM/PSM
Select
Oscillator
OSC
PSM
R
OSC
IN
PSM
EN
C
PSM
Modulator
V
O
PWM/PSM
MODE
Negative
Return and
Substrate
GND
PGND
DETAIL OPERATIONAL DESCRIPTION
Start-Up
Si9165 will always soft starts in the PWM mode regardless of
the voltage level on the PWM/PSM pin.
The UVLO circuit prevents the internal MOSFET switches and
oscillator circuit from turning on, if the voltage on VDD pin is less
than 2.5 V. With typical UVLO hysteresis of 0.1 V, controller is
continuously powered on until the VDD voltage drops below
2.4 V. This hysteresis prevents the converter from oscillating
during the start-up phase and unintentionally locking up the
system. Once the VDD voltage exceeds the UVLO threshold,
and with no other shutdown condition detected, an internal
Power-On-Reset timer is activated while most circuitry, except
the output driver, are turned on. After the POR timeout of about
1 ms, the internal soft-start capacitor is allowed to charge.
When the soft-start capacitor voltage reaches 0.5 V, the PWM
circuit is enabled. Thereafter, the constant current charging
the soft-start capacitor will force the output voltage to rise
gradually without overshooting. To prevent negative
undershoot, the synchronous switch is tri-stated until the duty
cycle reaches about 10%. In tri-state, the high-side p-channel
MOSFET is turned off by pulling up the gate voltage to VS
potential. The low-side n-channel MOSFET is turned off by
pulling down the gate voltage to PGND potential. Note that the
Shutdown
The Si9165 is designed to conserve as much battery life as
possible by decreasing current consumption of IC during
normal operation as well as the shutdown mode. With logic low
level on the SD pin, current consumption of the Si9165 is
decreased to less than 1 mA by shutting off most of the circuits.
The logic high enables the controller and starts up as
described in “Start-Up” section above.
Over Temperature Protection
The Si9165 is designed with over temperature protection
circuit to prevent MOSFET switches from running away. If the
temperature reaches 165_C, internal soft-start capacitor is
discharged, shutting down the output stage. Converter
remains in the disabled mode until the temperature in the IC
decreases below 140_C.
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
www.vishay.com
6
Si9165
Vishay Siliconix
PWM Mode
the Si9165 is designed with pulse skipping mode. If the
PWM/PSM pin is connected to logic low level, converter
operates in pulse skipping modulation (PSM) mode. During
the pulse skipping mode, quiescent current of the controller is
decreased to approximately 200 mA, instead of 500 mA during
the PWM mode. This is accomplished by turning off most of
internal control circuitry and utilizing a simple constant on-time
control with feedback comparator. The controller is designed
to have a constant on-time and a minimum off-time acting as
the feedback comparator blanking time. If the output voltage
drops below the desired level, the main switch is first turned on
and then off. If the applied on-time is insufficient to provide the
desired voltage, the controller will force another on and off
sequence, until the desired voltage is accomplished. If the
applied on-time forces the output to exceed the desired level,
as typically found in the light load condition, the converter stays
off. The excess energy is delivered to the output slowly, forcing
the converter to skip pulses as needed to maintain regulation.
The on-time and off-time are set internally based on inductor
used (1.5-mH Typical), Mode pin selection and maximum load
current. Wide duty cycle range can be achieved in both buck
With PWM/PSM mode pin in logic high condition, the Si9165
operates in constant frequency (PWM) mode. As the load and
line varies, switching frequency remain constant. The
switching frequency is programmed by the Rosc value as
shown by the Oscillator curve. In the PWM mode, the
synchronous drive is always enabled, even when the output
current reaches 0 A. In continuous current mode, transfer
function of the converter remain constant, providing fast
transient response. If the converter operates in discontinuous
current mode, overall loop gain decreases and transient
response time can be ten times longer than if the converter
remain in continuous current mode. This transient response
time advantage can significantly decrease the hold-up
capacitors needed on the output of dc-dc converter to meet the
transient voltage regulation. Therefore, the PWM/PSM pin is
available to dynamically program the controller.
The maximum duty cycle of the Si9165 can reach 100% in
buck mode. This allows the system designers to extract out
the maximum stored energy from the battery. Once the
controller delivers 100% duty cycle, converter operates like a
saturated linear regulator. At 100% duty cycle, synchronous
rectification is completely turned off. Up to a maximum duty
cycle of 80% at 2-MHz switching frequency, controller
maintains perfect output voltage regulation. If the input voltage
drops below the level where the converter requires greater
than 80% duty cycle, controller will deliver 100% duty cycle.
This instantaneous jump in duty cycle is due to fixed BBM time,
MOSFET delay/rise/fall time, and the internal propagational
delays. In order to maintain regulation, controller might
fluctuate its duty cycle back and forth from 100% to something
less than maximum duty cycle while the converter is operating
in this input voltage range. If the input voltage drops further,
controller will remain on 100%. If the input voltage increases
to a point where it requires less than 80% duty cycle,
synchronous rectification is once again activated.
and boost configurations.
In pulse skipping mode,
synchronous rectifier drive is also disabled to further decrease
the gate charge loss, which in turn improves overall converter
efficiency.
Reference
The reference voltage of the Si9165 is set at 1.3 V. The
reference voltage is internally connected to the non-inverting
inputs of the error amplifier. The reference is decoupled with
0.1-mF capacitor.
Error Amplifier
The error amplifier gain-bandwidth product and slew rate is
critical parameters which determines the transient response of
converter. The transient response is function of both small and
large signal response. The small signal is the converter closed
loop bandwidth and phase margin while the large signal is
determined by the error amplifier dv/dt and the inductor di/dt
slew rate. Besides the inductance value, error amplifier
determines the converter response time. In order to minimize
the response time, the Si9165 is designed with 2-MHz error
amplifier gain-bandwidth product to generate the widest
converter bandwidth and 3.5 V/msec slew rate for ultra-fast
large signal response.
The maximum duty cycle under boost mode is internally limited
to 75% to prevent inductor saturation. If the converter is turned
on for 100% duty cycle, inductor never gets a chance to
discharge its energy and eventually saturates. In boost mode,
synchronous rectifier is always turned on for minimum or
greater duration as long as the switch has been turned on. The
controller will deliver 0% duty cycle, if the input voltage is
greater than the programmed output voltage. Because of
signal propagation time and MOSFET delay/rise/fall time,
controller will not transition smoothly from minimum
controllable duty cycle to 0% duty cycle. For example,
controller may decrease its duty cycle from 5% to 0% abruptly,
instead of gradual decrease you see from 75% to 5%.
Oscillator
The oscillator is designed to operate up to 2-MHz minimal. The
2-MHz operating frequency allows the converter to minimize
the inductor and capacitor size, improving the power density
of the converter. Even with 2-MHz switching frequency,
quiescent current is only 500 mA with unique power saving
circuit design. The switching frequency is easily programmed
by attaching a resistor to ROSC pin. See oscillator frequency
versus ROSC curve to select the proper values for desired
Pulse Skipping Mode
The gate charge losses produced from the Miller capacitance
of MOSFETs are the dominant power dissipation parameter
during light load (i.e. < 10 mA). Therefore, less gate switching
will improve overall converter efficiency. This is exactly why
operating frequency.
The tolerance on the operating
frequency is "20% with 1% tolerance resistor.
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
www.vishay.com
7
Si9165
Vishay Siliconix
Synchronization
limited by the BBM time. Since the BBM time is fixed,
maximum controllable duty cycle will vary depending on the
switching frequency.
The synchronization to external clock is easily accomplished
by connecting the external clock into the SYNC pin. A logic
high to low transition synchronizes the clock. The external
clock frequency must be within 1.2 to 1.5 times the internal
clock frequency.
Output MOSFET Stage
The high- and low-side switches are integrated to provide
optimum performance and to minimize the overall converter
size. Both, high and low-side switches are designed to handle
up to 600 mA of continuous current. The MOSFET switches
were designed to minimize the gate charge loss as well as the
conduction loss. For the high frequency operation, switching
losses can exceed conduction loss, if the switches are
designed incorrectly. Under full load, efficiency of 90% is
accomplished with 3.6-V battery voltage in both buck and
boost modes (+2.7-V output voltage for buck mode and +5-V
output voltage for boost mode).
Break-Before-Make Timing
A proper BBM time is essential in order to prevent
shoot-through current and maintain high efficiency. The
break-before-make time is set internally at 20 ns @ VS = 3.6 V.
The high and low-side MOSFET drain voltages are monitored
and when the drain voltage reaches the 1.75 V below or above
its initial starting voltage, 20 ns BBM time is set before the other
switch turns on. The maximum controllable duty cycle is
Document Number: 70845
S-40693—Rev. C, 19-Apr-04
www.vishay.com
8
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| SI9166DB | VISHAY | High Frequency Programmable Topology Controller | 获取价格 |
|
| SI9166_04 | VISHAY | High Frequency Programmable Topology Controller | 获取价格 |
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| SI9167 | VISHAY | High-Frequency, High-Efficiency Buck Converter Design For Multi-Cell Battery Configured Systems Using Si9167 | 获取价格 |
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