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PDF SiP12107 Data sheet ( Hoja de datos )
| Número de pieza | SiP12107 | |
| Descripción | 3A Current-Mode Constant On-Time Synchronous Buck Regulator | |
| Fabricantes | Vishay | |
| Logotipo |  |
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www.vishay.com
SiP12107
Vishay Siliconix
5 V, 3 A Current-Mode Constant On-Time
Synchronous Buck Regulator
DESCRIPTION
The SiP12107 is a high frequency current-mode constant
on-time (CM-COT) synchronous buck regulator with
integrated high-side and low-side power MOSFETs. Its
power stage is capable of supplying 3 A continuous current
at 4 MHz switching frequency. This regulator produces an
adjustable output voltage down to 0.6 V from 2.8 V to 5.5 V
input rail to accommodate a variety of applications,
including computing, consumer electronics, telecom, and
industrial.
SiP12107’s CM-COT architecture delivers ultra-fast
transient response with minimum output capacitance and
tight ripple regulation at very light load. No ESR or external
ESR network is required for loop stability purpose. The
device also incorporates a power saving scheme that
significantly increases light load efficiency.
The regulator integrates a full protection feature set,
including output overvoltage protection (OVP), output under
voltage protection (UVP) and thermal shutdown (OTP). It
also has UVLO for input rail and internal soft-start ramp.
The SiP12107 is available in lead (Pb)-free power enhanced
MLP-16L package in 3 mm x 3 mm dimension.
FEATURES
• Halogen-free According to IEC 61249-2-21
Definition
• 2.8 V to 5.5 V input voltage
• Adjustable output voltage down to 0.6 V
• 3 A continuous output current
• Programmable switching frequency up to 4 MHz
• 95 % peak efficiency
• Supports all ceramic capacitors No external ESR required
• Ultrafast transient response
• Selectable power saving mode or force current mode
• ± 1 % accuracy
• Pulse-by-pulse current limit
• Scalable with SiP12108 - 5A
• Fully protected with OTP, SCP, UVP, OVP
• PGood Indicator
• Compliant to RoHS Directive 2011/65/EU
APPLICATIONS
• Notebook computers
• Desktop PCs and servers
• Handheld devices
• POLs for telecom
• Consumer electronics
• Industrial and automation
TYPICAL APPLICATION CIRCUIT AND PACKAGE OPTIONS
PWR_SAVE_MODE
ENABLE
POWER GOOD
INPUT = 2.8 V to 5.5 V
PGD
VIN
EN AUTO
LX
VOUT
AVIN
PGND
AGND
VFB
GMO
RON
VOUT
Fig. 1 - Typical Application Circuit for SiP12107
S12-0412-Rev. B, 20-Feb-12
1
Document Number: 63395
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
1 page  
www.vishay.com
PIN CONFIGURATION
16 15 14 13
VIN 1
AVIN 2
EN 3
RON 4
5 678
12 LX
11 LX
10 VOUT
9 VFB
MLPQ 3 x 3 - 16L
Fig. 3 - SiP12107 Pin Configuration (Top View)
SiP12107
Vishay Siliconix
PIN CONFIGURATION
PIN NUMBER
NAME
1 VIN
2 AVIN
3 EN
4 RON
5 AUTO
6 PGD
7 GMO
8 AGND
9 VFB
10 VOUT
11 LX
12 LX
13 LX
14 PGND
15 PGND
16 VIN
FUNCTION
Input supply voltage for power MOS. VIN = 2.8 V to 5.5 V
Input supply voltage for internal circuitry. AVIN = 2.8 V to 5.5 V
Enable pin. Enable > 1.5 V
An external resistor between RON and GND sets the switching on time.
Sets switching mode AUTO to AVIN = PWM, AUTO to GND = light load mode
Power good output. Open drain.
Connect to an external RC network for loop compensation and droop function
Analog ground
Feedback voltage. 0.6 V (typ.)
VOUT, output voltage sense connection
Switching output, inductor connection point
Switching output, inductor connection point
Switching output, inductor connection point
Power ground
Power ground
Input supply voltage for power MOS. VIN = 2.8 V to 5.5 V
S12-0412-Rev. B, 20-Feb-12
5
Document Number: 63395
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
5 Page 
www.vishay.com
OPERATIONAL DESCRIPTION
Device Overview
SiP12107 is a high-efficiency monolithic synchronous buck
regulator capable of delivering up to 3 A continuous current.
The device has programmable switching frequency up to
4 MHz. The control scheme is based on current-mode
constant-on-time architecture, which delivers fast transient
response and minimizes external components. Thanks to
the internal current ramp information, no high-ESR output
bulk or virtual ESR network is required for the loop stability.
This device also incorporates Power-Saving feature by
enabling diode emulation mode and frequency foldback as
load decrease.
SiP12107 has a full set of protection and monitoring
features:
- Over current protection in pulse-by-pulse mode
- Output over voltage protection
- Output under voltage protection with device latch
- Over temperature protection with hysteresis
- Dedicated enable pin for easy power sequencing
- Power Good open drain output
This device is available in MLPQ 3 x 3-16L package to
deliver high power density and minimize PCB area.
SiP12107
Vishay Siliconix
Power Stage
SiP12107 integrates a high-performance power stage with
a ~ 64 m p-channel MOSFET and a ~ 33 m n-channel
MOSFET. The MOSFETs are optimized to achieve 95 %
efficiency at 2 MHz switching frequency.
The power input voltage (VIN) can go up to 5.5 V and down
as low as 2.8 V for the power conversion. The logic bias
voltage (AVIN) ranges from 2.8 V to 5.5 V.
PWM Control Mechanism
SiP12107 employs a state-of-the-art current-mode COT
control mechanism. During steady-state operation, output
voltage is compared with internal reference (0.6 V typ.) and
the amplified error signal (VCOMP) is generated on the COMP
pin. In the meantime, inductor valley current is sensed, and
its slope (Isense) is converted into a voltage signal (Vcurrent) to
be compared with VCOMP. Once Vcurrent is lower than VCOMP,
a single shot on-time is generated for a fixed time
programmed by the external RON. Figure 4 illustrates the
basic block diagram for CM-COT architecture and figure 5
demonstrates the basic operational principle:
VOUT
VIN
HG
LS FET
LG
Bandgap
Vref
+
OTA
-
Current
Mirror
+
Isense I-AMP
-
RON
V comp
V current
VOUT
VIN
+
-
PWM
COMPARATOR
ON-TIME
Generator
Fig. 4 - CM-COT Block Diagram
Control
Logic &
MOSFET
Driver
HG
LG
S12-0412-Rev. B, 20-Feb-12
11
Document Number: 63395
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SiP12107.PDF ] | |
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