sip12203 Vishay, sip12203 Datasheet

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sip12203

Manufacturer Part Number
sip12203
Description
Triple Step Down Controller Ic For 2 Synchronous And 1 Linear Power Rails
Manufacturer
Vishay
Datasheet
DESCRIPTION
The SiP12203 is a triple-output controller designed for high
performance conversion of intermediate bus voltages into the
load supplies in set top boxes, base stations, wall adapters,
or network applications. Each output is adjustable down to
0.6 V. This IC controls two independent PWM outputs that
have 180° phase difference and are capable of driving 6 A
load. It also provides a built-in LDO controller that drives a
discrete P-channel MOSFET or a PNP transistor in linear
mode for up to 1 A current capability.
The SiP12203 also includes, for each PWM output,
independent
compensation and internal soft start functions. A single
power good (PG) pin feeds back the regulation status of the
3 outputs. This IC is designed for minimum number of
external components.
The SiP12203 incorporates several protection features. An
adjustable over current protection circuit monitors the output
current by sensing the voltage drop across the low-side
MOSFET. The over current hiccup operation protects the
DC/DC components from being damaged under overload or
short circuit conditions. Other protection features include
under voltage lockout, over voltage protection and thermal
shutdown.
The SiP12203 is available in a lead (Pb)-free MLP55-28
package and is specified to operate within - 40 °C to 125 °C
junction temperature.
TYPICAL APPLICATION CIRCUIT
Document Number: 69986
S-82337-Rev. B, 22-Sep-08
enable,
SYNC_IN
Triple Step Down Controller IC for 2 Synchronous
V
R18
IN
EN2
R4
current
R15
C8
C13
R11
C17
Q5
< 5.5 V
+
limit,
C15
Vo_LDO
C3
C5
R6
10
11
12
13
14
and 1 Linear Power Rails
8
9
FB2
AGND
V
SYNC
FB3
D3
AGND
C14
R3
R16
C1
IN
feed
R17
U1
SiP12203
C16
forward
R5
R14
C18
BST2
BST1
DH2
DL2
DH1
DL1
LX1
Figure 1.
C4
EN1
D1
28
27
26
25
24
23
22
V
L
D2
FEATURES
APPLICATIONS
• 4.5 V to 18 V input voltage range
• Three independent outputs with adjustable
• Two switching channels operate with 180° out of phase
• Load current up to 6 A x 2 switching channels and 1 A
• > 94 % efficiency
• Drives 5 external MOSFETs
• 500 kHz fixed switching frequency
• The oscillator frequency can be externally synchronized
• Internal soft start
• Voltage feed-forward compensation
• Independent enable pins for switching channels
• Independent adjustable output current limit
• Power good indication with optional output delay
• MLP55-28 package
• DSP, ASIC and FPGA power supplies
• Dual power supply applications: µP and DSP cores,
• Distributed and intermediate bus architectures
• LCD TV and set-top box
• Battery operated equipment
• Telecom
C10
voltages of as low as 0.6 V (2 switching and
1 linear)
linear
to a range of 6.72 MHz to 9.28 MHz
memory and logic I/Os
V
R7
IN
R8
R10
R9
Q1
Q2
V
IN
Q3
Q4
C2
L1
L2
C9
R12
R2
C12
C7
+
+
Vishay Siliconix
C11
C6
Vo_1
Vo_2
SiP12203
www.vishay.com
1

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sip12203 Summary of contents

Page 1

... DC/DC components from being damaged under overload or short circuit conditions. Other protection features include under voltage lockout, over voltage protection and thermal shutdown. The SiP12203 is available in a lead (Pb)-free MLP55-28 package and is specified to operate within - 40 °C to 125 °C junction temperature. TYPICAL APPLICATION CIRCUIT ...

Page 2

... RECOMMENDED OPERATING RANGE Parameter and I to GND IN SENSE DH and BST to LX All other pins to GND Output Voltage Operating Junction Temperature ORDERING INFORMATION Part Number SiP12203DLP-T1-E3 SPECIFICATIONS Parameter Symbol Controller Input Voltage Regulated Voltage a Oscillator Frequency ΔV Oscillator Ramp Amplitude b V Oscillator Ramp Offset ...

Page 3

... Pull-up resistor = 100 kΩ Lkg Percentage of set point when FB1 or FB2 is THH rising until Percentage of set point when FB1 or FB2 is THL falling until Percentage of set point when FB3 is falling LDO until SiP12203 Vishay Siliconix Limits a b Min. Typ. Max. 2 100 0.6 6.5 0.8 2 ...

Page 4

... SiP12203 Vishay Siliconix SPECIFICATIONS Parameter Symbol Protection Under Voltage Lockout for Under Voltage Lockout UVLO Hysteresis T Thermal Shutdown Threshold T Thermal Shutdown Hysteresis V Over Voltage Trip Threshold V Over Voltage Hysteresis OVHYS Hiccup Period Over Current Limit (Channel 1 and Channel 2) Current Limit Source Current ...

Page 5

... V. If one of the 2 channels powers the linear regulator, then during startup the output of the linear regulator will track the input with the voltage differential between the input and the output of the SiP12203 Vishay Siliconix voltage drop, the actual current limit has DS(ON) ...

Page 6

... Sync pin low and DS(ON) high, since the SiP12203 has an internal 100K pull down resistor. When not used, connect this pin to an adjacent analog ground pin or leave it open. Power good (PG) Power good is a system level feature. PG has an open-drain output so a pull-up resistor is required ...

Page 7

... LX1 to BST1 25 DL1 Converter 1 low-side gate drive 26 DL2 Converter 2 low-side gate drive Bootstrap voltage for converter 2 high-side MOSFET driver. Connect a 0.1 µF or greater capacitor 27 BST2 between LX2 to BST2 28 DH2 Converter 2 high-side gate drive Document Number: 69986 S-82337-Rev. B, 22-Sep-08 Vishay Siliconix Function L SiP12203 www.vishay.com 7 ...

Page 8

... SiP12203 Vishay Siliconix APPLICATION INFORMATION Startup Circuit What is a startup circuit? Why is it needed? To answer this question, let us take a look at an application example pulled through a 100k resistor. L After input power supply is turned on, V and V ramps up at the same rate regulated voltage, typical 5 V) ...

Page 9

... The SiP12203 uses voltage mode control in conjunction with a high frequency transconductance error amplifier. The volt- age feedback loop is compensated at the COMP pin, which is the output node of the error amplifier. The feedback loop is generally compensated with (one pole, one zero) network from COMP to AGND ...

Page 10

... However, noise levels can be minimized by properly laying out the components. Here are some general guidelines for laying out a step-down converter with the SiP12203. Since power traces in step down converters carry pulsating current, energy stored in trace inductance during the pulse can cause high-frequency ringing with input and output capacitors ...

Page 11

... Temperature (°C) Switching Frequency f SW Document Number: 69986 S-82337-Rev. B, 22-Sep-08 110 160 vs. Temperature 110 160 Max. Duty Cycle vs. Temperature in Steady State Mode 110 160 vs. Temperature SiP12203 Vishay Siliconix 100 120 140 160 Temperature (°C) Max ...

Page 12

... SiP12203 Vishay Siliconix TYPICAL CHARACTERISTICS 3 2 Temperature (°C) Quiescent Current I vs. Temperature Q 3.36 3.34 3.32 3.30 3.28 3.26 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Load Current (V) Channel 1 Load Regulation www.vishay.com 110 160 - 40 5.05 5. 4.99 4.97 4. 110 Temperature (°C) Current Limit I vs Temperature 5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Load Current (A) ...

Page 13

... ms/div t: 1 ms/div V/div V/div (COMP2: 0.5 V/div V/div) O2 SiP12203 Vishay Siliconix V/div (EN2: 2 V/div) C3 (COMP2: 0.5 V/div 0.5 V/div 4.7 µ ms/div Channel 2 Startup (COMP1: 0.5 V/div) ...

Page 14

... SiP12203 Vishay Siliconix TYPICAL WAVEFORMS V/div) LDO_IN V/div) LDO_OUT C2 C3 C4: D3: 1 V/div) C4 LDO Steady State mV/div, AC coupled 0.5 A/div) O1 Slew Rate: 1 A/µs V set to 3.3 V/div 4.7 µ 600 µ 200 µs/div Channel 1 Transient Response mV/div, AC coupled) ...

Page 15

... Document Number: 69986 S-82337-Rev. B, 22-Sep-08 = 600 µ set to 3 ms/div set to 3 4.7 µ 600 µ SiP12203 Vishay Siliconix L = 4.7 µ 600 µ Over Current set A/div) O2 Load Current = V/div) V set to 1 ...

Page 16

... Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’ ...

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