Buck Regulators. SMB209 Datasheet

SMB209 Regulators. Datasheet pdf. Equivalent


SUMMIT SMB209
SMB207/A/208/A/209/A
Preliminary Information 1 (See Last Page)
Single & Dual Programmable Buck Regulators with Integrated MOSFETs and Digital Control
FEATURES & APPLICATIONS
Features
Single/Dual Step-Down DC-DC Outputs
- Integrated power MOSFET switches
- 1A/2A/4A output current with built in current limit
- Input voltage range: +4.5V to +16V
- +0.8V to +5.0V output voltage (+/-2.5% accuracy)
- Automatic PFM mode for light load efficiency
- 1800 phase interleave (SMB207/A/208/A)
- Integrated frequency compensation
- Input undervoltage lockout (UVLO)
Integrated Power Control and Programmability
- I2C Digital or Pin Control
- Coarse and Fine Output Voltage Setting
16-level “Coarse” nominal setpoint
+0.8V to +1.8V @ 100mV/step
+2.5/2.3/3.0/3.3/5.0V
8-level “Fine” Margining (20XA only)
+1.14% to +7.95% (vs. coarse setting)
- PWM frequency: 500kHz or 1MHz
- Output up/down sequence (SMB207/A/208/A)
- Digital output softstart/stop
- Output UV monitoring with PGOOD/RESET output
- Independent output enable pins (SMB207/A/208/A)
Applications
Digital LCD/Plasma TV
Digital Set-Top Box/PVR/DVR
Datacom/Telecom Equipment
INTRODUCTION
The SMB20X/20XA are a highly integrated and flexible
Single/Dual-output DC-DC regulator designed for use in a wide
variety of applications. High integration reduces system cost,
component count and development time while the built-in non-
volatile digital programmability allows system designers to custom
tailor the device to suit almost any application.
The SMB20X/20XA include single/dual DC-DC step-down
regulators with integrated high-side MOSFET switches for up to
1A/2A/4A continuous output current. Programmable output
voltages as low as +0.8V support the latest VLSI digital cores.
Minimum external components result in a very compact solution
size for space constrained applications.
Also sophisticated power control/monitoring functions required by
many systems are built-in and accessible via digital I2C interface.
These include digitally programmable output voltage setpoint,
power-up/down softstart and sequencing, independent
enable/disable, output UV monitoring with Power Good/Reset
output. Additionally on the SMB20XA fine resolution voltage
margining is provided to allow for sophisticated system
optimization.
The integration of features and built-in flexibility of the
SMB20X/20XA allow the system designer to create a “platform
solution” that can be easily modified without hardware changes.
The SMB20X/20XA are well suited to applications with an input
range of +4.5 to +16V. The operating temperature range is -40oC
to +85oC and the available package is a 3mm X 3mm 20-pad QFN.
Figure 1 - SIMPLIFIED APPLICATION
SMB207/A/208/A
+4.5V to +16V
DC IN
Step-Down 0
int. FET
I2C I/F
System
Control
Enable Inputs
and
PGOOD/RESET Output Monitoring
Step-Down 1
int. FET
+0.8V to +5.0V (Prog.)
up to 1A/2A
+0.8V to +5.0V (Prog.)
up to 1A/2A
CPU
Memory
+4.5V to +16V
DC IN
SMB209/A
I2C I/F
System
Control
Enable Input
and
PGOOD/RESET Output Monitoring
Step-Down
int. FET
+0.8V to +5.0V (Prog.)
4A
ASIC/SoC
SUMMIT Microelectronics, Inc. 2009 • 757 N. Mary Ave • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com/
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SMB209 Datasheet
Recommendation SMB209 Datasheet
Part SMB209
Description Single & Dual Programmable Buck Regulators
Feature SMB209; SMB207/A/208/A/209/A Preliminary Information 1 (See Last Page) Single & Dual Programmable Buck Regul.
Manufacture SUMMIT
Datasheet
Download SMB209 Datasheet




SUMMIT SMB209
GENERAL DESCRIPTION
Digital Interface/Non-Volatile Programming
The built-in serial digital I2C/SMBus compatible port and
built-in non-volatile programming bring several benefits
to power supply design with the SMB20X/20XA. Many
external components are eliminated that would
otherwise be used to set configuration and parametric
values. Additionally the digital interface allows for quick
and easy development and debug without hardware
changes. Finally, after the non-volatile power-up
configuration the serial port can used to re-program the
SMB20X/20XA by host software after the system is
running. For quick programming development and
debug use Summit’s prebuilt evaluation kit including a
PC-based graphical user interface (GUI).
Single/Dual PWM DC-DC Regulators
The SMB20X/20XA contain one/two integrated PWM
DC-DC step-down (buck) regulator(s). In the
SMB207A/208/A both regulators are identical and share
the same features and functions. The input voltage
range is +4.5V to +16V to support a wide variety of
system applications. The outputs support a full
1A/2A/4A continuous output current with built-in cycle-
by-cycle current limit. The output voltage range is
similarly flexible over +0.8V and +5.0V and fully
programmable in non-volatile (static) or volatile
(dynamic, on-the-fly) via the serial digital interface. The
nominal “coarse” voltage programming provides
flexibility for various types of loads without hardware
changes. In the SMB20XA the “fine” programming
provides “margining” capability for sophisticated system
validation and optimization
Built-in high-side MOSFETs work in conjunction with
external Schottky diode rectifiers in constant frequency
SMB207/A/208/A/209/A
Preliminary Information
PWM-mode at high load currents or high efficiency pulse
skipping PFM-mode at light loads. Switching frequency
is programmable (500kHz/1000kHz) to trade off
efficiency and component size. Each output
(SMB207A/208/A) switches 180o out of phase with the
other to reduce input ripple current, switching noise and
input capacitance requirement. Bootstrapped high-side
drive improves efficiency and extends operating voltage
range. Frequency compensation is fully integrated to
further reduce component count and cost.
Power Control/Management Functions
The SMB20X/20XA integrate several power
management functions that are typically otherwise
performed by external circuits. These include output
sequencing with programmable timing, hardware or
software-based output enable/disable, and
programmable softstart timing. Also the output voltages
are monitored with a programmable PGOOD/RESET
output (PGOOD asserts immediately, RESET delays
125ms). Software Enable bits and hardware Enable
pins work together to provide flexible power up/down
and manual/auto sequencing
The SMB20X/20XA also support digitally programmable
output voltage. The non-volatile setting determines the
power-up/static value but it can be re-programmed by
software via the serial interface. The settings are +0.8V
to +1.8V with 100mV step plus +2.5/2.3/3.0/3.3/5.0V
settings. This can support dynamic voltage/clock CPU
cores or low power memory modes.
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SUMMIT SMB209
Figure 2 - TYPICAL APPLICATION SMB207A/208/A
+4.5V to +16V
PVIN(4)
10/
22uF
AVIN
VDD
1uF
SDA
SCL
EN1
EN0
PGOOD/RESET
GND
SMB207/A/208/A
UVLO
Internal
5V LDO
I2C I/F
Digital
Control
NV OTP
Oscillator
Θ0
Θ1
Output
Voltage
Sequencer
Softstart
Vref
PWM
PWM
SMB207/A/208/A/209/A
Preliminary Information
BST0
SW0(2)
6.8/3.3uH +0.8V to +5V @ 1A/2A
FB0
BST1
SW1(2)
1A/2A
1 x 22uF
or
2 x 22uF
6.8/3.3uH
+0.8V to +5V @ 1A/2A
FB1
1A/2A
1 x 22uF
or
2 x 22uF
Figure 3 - TYPICAL APPLICATION SMB209
+4.5V to +16V
22uF
PVIN(4)
AVIN
VDD
1uF
SDA
SCL
EN
PGOOD/RESET
SMB209/A
UVLO
Internal
5V LDO
I2C I/F
Digital
Control
NV OTP
Oscillator
Vout
Sequencer
Softstart
Vref
PWM
BST(2)
0.1uF
SW(4)
1.5uH
FB
4A
GND
+0.8V to +5V @ 4A
4x
22uF
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