SI9176DM-T1 [VISHAY]
High Performance Step-Down DC-DC Converter With Adjustable Output Voltage; 高性能降压型DC -DC转换器可调节输出电压
| 型号： | SI9176DM-T1 |
| 厂家： | 
VISHAY |
| 描述： | High Performance Step-Down DC-DC Converter With Adjustable Output Voltage |
| 文件： | 总12页 (文件大小：321K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Si9176
Vishay Siliconix
New Product
High Performance Step-Down DC-DC Converter
With Adjustable Output Voltage
D User Selectable PWM, PSM, or AUTO Mode
FEATURES
D PSM Frequency ≥20 kHz for Inaudible
D 2-MHz PWM Operation
Harmonics
D Integrated MOSFET Switches
D 2.6-V to 6.0-V Input Voltage Range
D Minimal Number of External Components
D Up to 96% conversion efficiency
D 600-mA Load Capability
D 100% Duty Cycle Allows Low Dropout
D Integrated Compensation Circuit
D Over-Current Protection
D Shutdown Current < 2 mA
D Thermal Shutdown
D Integrated UVLO
D 10-Pin MSOP and Space Saving MLP33 Packaging
APPLICATIONS
D W-CDMA Cell Phone
D PDAs/Palmtop PCs
D LCD Modules
D Portable Image Scanners
D GPS Receivers
D Smart Phones
D MP3 Players
D 3G Cell Phone
D Digital Cameras
DESCRIPTION
The Si9176 is a high efficiency 600-mA step down converter
with internal low on resistance power MOSFET switch and
synchronous rectifier transistors. It is designed to convert one
cell LiIon battery or three cell alkaline battery voltages to a
2-MHz switching permits use of small external inductor and
capacitor sizes allowing one of the smallest solutions.
PSM mode provides increased efficiency at light loads. In PSM
mode the oscillator frequency is kept above 20 kHz to avoid
audio band interference. When operating in Auto mode, the
converter automatically selects operating in either PWM or
PSM mode according to load current demand.
dynamically adjustable dc output.
The integrated high
frequency error amplifier with internal compensation
minimizes external components.
In order to insure efficient conversion throughout the entire
load range, PWM (pulse width modulation), PSM (pulse
skipping mode) or Auto mode can be selected. In PWM mode,
The Si9176 is available in 10-pin MSOP and even smaller
MLP33 packages and is specified to operate over the
industrial temperature range of –40_C to 85_C.
TYPICAL APPLICATIONS CIRCUIT
BATTERY
V
IN
2.2 mH
V
OUT
LX
V
DD
C
IN
10 mF
C
OUT
4.7 mF
R
1
Si9176
PGND
FB
SD
ENABLE
PWM/PSM/AUTO
REF
AGND
REF
R
2
MODE
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
1
Si9176
New Product
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to AGND = 0 V
Thermal Impedance (Θ )
JA
10-Pin MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135_C/W
10-Pin MLP33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71_C/W
V
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 V
IN, DD
Lx, SD, MODE, FB, C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . --0.3 to 6.2 V
REF
(or to V
+0.3 V whichever is less)
Peak Inductor Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 A
DD
GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . --0.3 to +0.3 V
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . --65 to 125_C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.4 mW/_C above 85_C.
c. Derate 14 mW/_C above 85_C.
a
Power Dissipation (Package)
b
10-pin MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 481 mW
10-pin MLP33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 915 mW
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
V
C
C
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.6 V to 5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mF Ceramic
Inductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 mH
Operating Load Current PWM Mode . . . . . . . . . . . . . . . . . . . . . . 0 to 600 mA
Operating Load Current PSM Mode . . . . . . . . . . . . . . . . . . . . . . . 0 to 150 mA
IN
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7 mF Ceramic
OUT
SPECIFICATIONS
Test Conditions Unless Specified
Parameter
Limits
-- 4 0 _C to 85_C, V = V , C = 10 mF, C = 4.7 mF
IN
DD,
IN
OUT
f
a
b
a
Mode
Symbol
Min
Typ
Max
Unit
L = 2.2 mH, 2.6 V ≤ V ≤ 5.5 V, R = 11.3 kΩ, R = 20 kΩ
IN
1
2
Under Voltage Lockout (UVLO)
Under Voltage Lockout (turn-on)
Hysteresis
V
IN
rising
2.3
2.5
V
0.1
Shutdown (SD)
Logic HIGH
Logic LOW
V
1.6
SDH
V
V
0.4
SDL
R
= 3.3 Ω
= 51 Ω
100
L
Settle Within ±2% accuracy SD rising
t < 1 ms
c
Delay to Output
t
en
ms
r
R
100
L
Pull Down
I
Input at V
mA
SD
IN
Mode Selection Tri-Level Logic (MODE)
MODE Pin HIGH
MODE Pin LOW
PWM
Auto
V
-- 0 . 4
V
IN
IN
V
0.4
2.4
MODE = GND
MODE = V
-- 5
Mode Pin Input Current
mA
5
IN
Oscillator
Frequency
f
1.6
2
MHz
V
OSC
Error Amplifier (FB Pin)
T
= 25_C
1.190
1.173
1.215
1.240
1.257
A
FB Voltage Accuracy
V
FB
T
A
= --40 to 85_C
Power Supply Rejection
Input Bias Current
PSRR
V
IN
= 2.6 V to 5.5 V
60
db
DC
I
FB
V
FB
= 1.25 V
-- 1
0.01
1
mA
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
2
Si9176
Vishay Siliconix
New Product
SPECIFICATIONS
Test Conditions Unless Specified
Parameter
Limits
-- 4 0 _C to 85_C, V = V , C = 10 mF, C = 4.7 mF
IN
DD,
IN
OUT
f
a
b
a
Mode
Symbol
Min
Typ
Max
Unit
L = 2.2 mH, 2.6 V ≤ V ≤ 5.5 V, R = 11.3 kΩ, R = 20 kΩ
IN
1
2
Converter Operation
Maximum Output
Current
PWM
PSM
I
I
V
V
= 3.6 V
= 3.6 V
600
mA
mA
LOAD
IN
Maximum Output
Current
150
300
LOAD
IN
e
Dropout Voltage
V
DD
V
= 2.6 V, I = 600 mA
OUT
190
300
0.5
mV
IN
Closed Loop Bandwidth
BW
kHz
PWM
PSM
PWM
PSM
I
= 30 mA to 600 mA
= 30 mA to 75 mA
OUT
V
= 3.6 V
IN
c
Load Regulation
%
V
= 1.9 V @ 25_C
OUT
I
0.25
0.1
0.1
200
1500
250
250
60
OUT
Line Regulation
V
= 3.0 V, V = 3.5 V to 5.5 V
%/V
mA
mΩ
OUT
IN
PWM/PSM Switch Threshold Current
Maximum Inductor Peak Current Limit
P-Channel
I
AUpk
I
Lpk
On Resistance
N-Channel
r
V
IN
= 3.6 V
DS(on)
PWM
I
I
= 600 mA
= 30 mA
= 600 mA
= 30 mA
OUT
Output Ripple Voltage
PSM
0.05 Ω C
mV
p-p
OUT(ESR)
I
80
OUT
OUT
PWM
90
Efficiency
PSM
V
= 3.6 V, V
= 3.3 V
%
IN
OUT
I
80
OUT
Frequency
PSM
I
≥ 30 mA
20
kHz
OUT
Supply Current
PWM
PSM
450
400
750
2
I
SUPPLY
Input Supply Current
(V
&
I
= 0 mA, V = 3.6 V (not switching, FB = GND)
IN
DD
OUT
mA
V
IN
)
Shutdown Supply Current
I
SD = Low
SD
Thermal Shutdown
c
Thermal Shutdown Temperature
T
165
20
J(S/D)
_C
c
Thermal Hysteresis
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.
d. Settling times, t , apply after t
.
s
en
e. Bypass is a device mode of operation, in which, the device is in 100% duty cycle. Bypass operation is possible in either PWM or PSM.
f. Operating modes are controlled with the MODE pin where Auto mode = MODE = LOW, PWM Mode = MODE = HIGH, and PSM mode = MODE = OPEN.
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
3
Si9176
New Product
Vishay Siliconix
PIN CONFIGURATION
MSOP-10
MLP33
1
2
3
4
5
10
9
L
PGND
X
L
10
9
8
7
6
PGND
X
AGND
FB
V
IN
AGND
FB
2
3
4
5
V
IN
8
AGND
SD
AGND
SD
MODE
V
7
V
DD
REF
DD
6
REF
MODE
Top View
Top View
PIN DESCRIPTION
Pin Number
Name
Function
1
2
3
4
5
L
Inductor connection
X
AGND
FB
Low power analog ground
Output voltage feedback
V
DD
Input supply voltage for the analog circuit.
REF
Internal reference, no connection should be made to this pin.
Used to select switching mode of the buck converter
PWM/PSM Pin Logic:
6
MODE
MODE Pin
Operating Mode
PWM
V
IN
Open
GND
PSM
AUTO
7
8
SD
Logic low disables IC and reduces quiescent current to below 2 mA
Must be connected to AGND.
AGND
9
V
IN
Input supply voltage
10
PGND
Low impedance power ground
ORDERING INFORMATION
MSOP-10
MLP33
Part Number
Marking
Temperature
Part Number
Marking
Temperature
Si9176DH-T1
9176
--40 to 85_C
Si9176DM-T1
9176
--40 to 85_C
Additional voltage options are available.
Eval Kit
Temperature Range
Board
Si9176DB
--40 to 85_C
Surface Mount
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
4
Si9176
Vishay Siliconix
New Product
FUNCTIONAL BLOCK DIAGRAM
V
DD
V
IN
Si9176
PMOS
Current Sense
Error
PWM
Comparator
Amplifier
FB
PWM and
Pulse
Skipping
Logic
--
+
Clamp
--
L
X
REF
+
To IC Bias
Voltage
Reference,
UVLO
2 MHz
Oscillator
AGND
AGND
MODE SD
PGND
DETAIL DESCRIPTION
General
conditions. Switching to other modes of operation occurs
according to the state of the MODE pin and the load current.
The start-up sequence occurs after SD switches from LOW to
The Si9176 is a high efficiency synchronous dc-dc converter
that is ideally suited for lithium ion battery or three cell alkaline
applications, as well as step-down of 3.3-V or 5.0-V supplies.
The major blocks of the Si9176 are shown in the Functional
Block Diagram. The 0.25-Ω internal MOSFETs switching at a
frequency of 2-MHz minimize PC board space while providing
high conversion efficiency and performance. The high
frequency error-amplifier with built-in loop compensation
minimizes external components and provides rapid output
settling times of <30 ms. Sensing of the inductor current for
control is accomplished internally without power wasting
resistors.
HIGH with V applied, or after V rises above the UVLO
IN
IN
threshold and SD is a logic HIGH.
Mode Control (MODE)
The MODE pin allows the user to control the mode of operation
or to enable the Si9176 to automatically optimize the mode of
operation according to load current. There are three different
modes of operation as controlled by the MODE pin. Switching
waveforms are shown in the Typical Switching Waveform
sections, page 9.
Start-Up
PWM Mode (MODE pin = HIGH)
When voltage is applied to V and V , the under-voltage
IN
DD
lockout (UVLO) circuit prevents the oscillator and control
circuitry from turning on until the voltage on the exceeds 2.4 V.
With a typical UVLO hysteresis of 0.1 V, the converter
With the MODE pin in the logic HIGH condition, the Si9176
operates as a 2-MHz fixed frequency voltage mode converter.
A
NMOS synchronous rectification MOSFET transistor
operates continuously until the voltage on V drops below
provides very high conversion efficiency for large load currents
by minimizing the conduction losses. PWM mode provides low
output ripple, fast transient response, and switching frequency
synchronization. Output load currents can range from 0 to
600 mA.
IN
2.3 V, whereupon the converter shuts down. This hysteresis
prevents false start-stop cycling as the input voltage
approaches the UVLO switching threshold. Start-up is always
accomplished in PWM mode to ensure start-up under all load
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
5
Si9176
New Product
Vishay Siliconix
The error amplifier and comparator control the duty cycle of the
PMOS MOSFET to continuously force the REF pin and FB pin
voltages to be equal. As the input-to-output voltage difference
drops, the duty cycle of the PMOS MOSFET can reach 100%
to allow system designers to extract the maximum stored
energy from the battery. The dropout voltage is 190 mV at
600 mA.
currents, the converter operates in PSM mode to conserve
power. The switchover threshold between the two modes is
determined by the peak inductor current, which is 300 mA
nominal. There is hysteresis in the switchover threshold to
provide smooth operation. Thus, the mode PSM-to-PWM
mode switchover current for increasing load currents is higher
than that of PWM-to-PSM mode switchover for decreasing
load currents.
During each cycle, the PMOS switch current is limited to a
maximum of 1.5 A (typical) thereby protecting the IC while
continuing to force maximum current into the load.
Oscillator
The internal oscillator provides for a fixed 2-MHz switching
frequency.
Pulse Skipping Mode (MODE pin = OPEN)
By leaving the MODE pin open-circuit, the converter runs in
pulse skipping mode (PSM). In PSM mode the oscillator
continues to operate, but switching only occurs if the FB pin
voltage is below the REF voltage at the start of each clock
cycle. Clock cycles are skipped thereby reducing the
switching frequency to well below 100 kHz and minimizing
switching losses for improved efficiency at loads under
150 mA. Although PSM mode switching frequency varies with
line and load conditions, the minimum PSM frequency will be
kept above 20 kHz for load currents of 30 mA or more to
prevent switching noise from reaching the audio frequency
range.
Dynamic Output Voltage Control (REF)
The Si9176 is designed with an adjustable output voltage
which has a change of V to V -- V . VOUT is defined
DROP
FB
IN
according to the following relationship:
R1
R2
= 1 +
VOUT
× VFB
Each time the PMOS switch is turned on, the inductor current
is allowed to reach 300 mA. Once achieved, the PMOS switch
is turned off and the NMOS switch is turned on in the normal
manner. However, unlike PWM mode, the NMOS switch, turns
off as the switch current approaches zero current to maximize
efficiency. The PMOS switch remains on continuously (100%
duty cycle) when the input-voltage-to-output-voltage
difference is low enabling maximum possible energy
extraction from the battery.
Converter Shutdown (SD pin)
With logic LOW level on the SD pin, the Si9176 is shutdown.
Shutdown reduces current consumption to less than 2-mA by
shutting off all of the internal circuits. Both the PMOS and
NMOS transistors are turned off. A logic HIGH enables the IC
to start up as described in “Start-up” section.
Thermal Shutdown
PSM mode is recommend for load currents of 150 mA or less.
The Si9176 includes thermal shutdown circuitry, which turns
off the regulator when the junction temperature exceeds
165_C. Once the junction temperature drops below 145_C,
the regulator is enabled. If the condition causing the over
temperature, the Si9176 begins thermal cycling, turning the
regulator on and off in response to junction temperature.
Restart from a thermal shutdown condition is the same as
described in the “Start-up” section.
Auto Mode
When the MODE pin grounded, the converter is set to Auto
mode. Switching between PWM mode and PSM modes takes
place automatically without an external control signal. For
heavy load operation, the converter will operate in PWM mode
to achieve maximum efficiency. When delivering light load
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
6
Si9176
Vishay Siliconix
New Product
APPLICATIONS CIRCUIT
BATT
V
IN
2.2 mH
V
OUT
LX
V
DD
C
1
C
IN
10 mF
C
OUT
C
2
4.7 mF
Si9176
R
1
PGND
FB
REF
AGND
REF
ENABLE
PWM/PSM/AUTO
SD
R
2
MODE
AGND
C
= 10 mF, Ceramic, Murata GRM42-2X5R106K16
IN
1
C , C = 0.01 mF, Vishay VJ0603Y 104KXXAT
2
C
R
R
L
= 4.7 mF, Ceramic, Murata GRM42-6X5R475K16
OUT
= 8.2 kΩ, Vishay CRCW06031132F
= 20 kΩ, Vishay CRCW06032002F
= 2.2 mH, Toko A914BYW-2R2M
1
2
ꢀ
TYPICAL CHARACTERISTICS
V
SDH
V
SDL
SD
t
r
t
f
Undefined
(Load Dependent)
t
en
V
OUT
Time
d Indicates V
settles to ±2% of the final value.
OUT
Figure 1.
PWM Mode V
Settling
OUT
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
7
Si9176
New Product
Vishay Siliconix
TYPICAL CHARACTERISTICS
Dropout Voltage vs. I
Auto Mode Efficiency vs. Load
LOAD
100
200
V
IN
= 3.6 V
95
90
85
80
75
70
160
120
80
40
0
V
= 3.0 V
OUT
V
= 2.6 V
IN
V
= 3.6 V
IN
V
= 1.9 V
OUT
V
IN
= 5.5 V
0
100
200
300
400
500
600
0
100
200
300
400
500
600
Load Current (mA)
Load Current (mA)
PSM vs. PWM Efficiency
100
95
90
85
80
75
PWM
PSM
V
OUT
Ripple
100
80
60
40
20
0
V
V
= 3.6 V
IN
= 1.9 V
OUT
PSM
C
= 4.7 mF
OUT
0
100
200
300
400
500
600
Load Current (mA)
Auto Mode Efficiency vs. Load Direction
100
95
90
85
80
75
Load Decreasing
Load Increasing
PWM
0
30
60
90
120
150
Load Current (mA)
0
100
200
300
400
500
600
Load Current (mA)
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
8
Si9176
Vishay Siliconix
New Product
TYPICAL SWITCHING WAVEFORMS (VIN = 3.6 V, VOUT = 3.0 V)
PWM mode Heavy-Load Switching Waveforms,
= 600 mA, MODE = HIGH
PWM Mode Medium-Load Switching Waveforms,
= 300 mA, MODE = HIGH
I
I
OUT
OUT
V , 5 V/div
LX
V , 2 V/div
LX
Inductor Current
500 mA/div
Inductor Current
500 mA/div
V
OUT
V
OUT
(AC-Coupled)
10 mV/div
(AC-Coupled)
10 mV/div
200 nS/div
200 nS/div
PSM Mode Light-Load Switching Waveforms,
PWM Mode Light-Load Switching Waveforms,
= 0 mA, MODE = HIGH
I
I
= 150 mA, MODE = OPEN
OUT
OUT
V , 5 V/div
LX
V , 5 V/div
LX
Inductor Current
200 mA/div
Inductor Current
200 mA/div
V
V
OUT
(AC-Coupled)
10 mV/div
OUT
(AC-Coupled)
10 mV/div
200 nS/div
1.0 mS/div
PSM Mode Light-Load Switching Waveforms,
I
= 30 mA, MODE = OPEN
OUT
V , 5 V/div
LX
Inductor Current
200 mA/div
V
OUT
(AC-Coupled)
100 mV/div
2.0 mS/div
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
9
Si9176
New Product
Vishay Siliconix
TYPICAL WAVEFORMS (VIN = 3.6 V, VOUT = 1.9 V)
PWM Mode Heavy-Load Switching Waveforms,
= 600 mA, MODE = HIGH
PWM Mode Medium-Load Switching Waveforms,
= 300 mA, MODE = HIGH
I
I
OUT
OUT
V , 5 V/div
LX
V , 5 V/div
LX
Inductor Current
500 mA/div
Inductor Current
500 mA/div
V
V
OUT
OUT
(AC-Coupled)
10 mV/div
(AC-Coupled)
10 mV/div
200 nS/div
200 nS/div
PWM Mode Light-Load Switching Waveforms,
= 0 mA, MODE = HIGH
PSM Mode Light-Load Switching Waveforms,
I
I
= 150 mA, MODE = OPEN
OUT
OUT
V , 5 V/div
LX
V , 5 V/div
LX
Inductor Current
200 mA/div
Inductor Current
200 mA/div
V
OUT
V
OUT
(AC-Coupled)
10 mV/div
(AC-Coupled)
100 mV/div
200 nS/div
1.0 mS/div
PSM Mode Light-Load Switching Waveforms,
I
= 30 mA, MODE = OPEN
OUT
V , 5 V/div
LX
Inductor Current
200 mA/div
V
OUT
(AC-Coupled)
100 mV/div
2.0 mS/div
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
10
Si9176
Vishay Siliconix
New Product
TYPICAL START-UP AND SHUTDOWN TRANSIENT WAVEFORMS (VIN = 3.6 V, VOUT = 1.9 V)
Start-Up, R
= 4 Ω
Start-Up, V = V = 3.6 V, R
= 4 Ω
LOAD
LOAD
IN
SD
V , V , 1 V/div
IN SD
V , 1 V/div
SD
V , 500 mV/div
OUT
V , 500 mV/div
OUT
20 mS/div
Shutdown, R
20 mS/div
= 4 Ω
Enable Switching, R
= 4 Ω
LOAD
LOAD
V , 1 V/div
SD
V
SD
1 V/div
V , 500 mV/div
OUT
V , 500 mV/div
OUT
200 mS/div
20 mS/div
TYPICAL MODE SWITCH TRANSIENT WAVEFORM
Output Transient At Mode Switch, I
= 30 mA
LOAD
V
OUT
(AC-Coupled)
200 mV/div
Mode Pin
1 V/div
100 mS/div
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
11
Si9176
New Product
Vishay Siliconix
TYPICAL LOAD TRANSIENT WAVEFORMS (VIN = 3.6 V, VOUT = 1.9 V)
Load Transient, Auto Mode, I
= 30 to
Load Transient, PWM Mode,
= 30 to 500 mA, L = 2.2 mH, MODE= HIGH
LOAD
500 mA, MODE = LOW
I
LOAD
I , 200 mA /div
LOAD
I , 200 mA /div
LOAD
V
OUT
V
OUT
(AC-Coupled)
50 mV/div
(AC-Coupled)
50 V/div
10 mS/div
10 mS/div
Load Transient (PSM Mode),
= 30 to 150 mA, L = 2.2 mH
I
LOAD
I , 200 mA /div
LOAD
V
OUT
(AC-Coupled)
50 mV/div
100 mS/div
Document Number: 71753
S-21825—Rev. A, 07-Oct-02
www.vishay.com
12
相关型号：
SI9177BH-TI-E3
IC IC,SMPS CONTROLLER,VOLTAGE-MODE,TSSOP,10PIN,PLASTIC, Switching Regulator or Controller
VISHAY
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