LM2832_14 Datasheet, PDF (1/33 Pages) Texas Instruments – High Frequency 2.0A Load - Step-Down DC-DC Regulator

LM2832
www.ti.com
SNVS455 – AUGUST 2006
LM2832 High Frequency 2.0A Load - Step-Down DC-DC Regulator
Check for Samples: LM2832
FEATURES
1
•2 Input voltage range of 3.0V to 5.5V
• Output voltage range of 0.6V to 4.5V
• 2.0A output current
• High Switching Frequencies
– 1.6MHz (LM2832X)
– 0.55MHz (LM2832Y)
– 3.0MHz (LM2832Z)
• 150mΩ PMOS switch
• 0.6V, 2% Internal Voltage Reference
• Internal soft-start
• Current mode, PWM operation
• Thermal Shutdown
• Over voltage protection
APPLICATIONS
• Local 5V to Vcore Step-Down Converters
• Core Power in HDDs
• Set-Top Boxes
• USB Powered Devices
• DSL Modems
DESCRIPTION
The LM2832 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6 Pin LLP and a 8
Pin eMSOP package. It provides all the active functions to provide local DC/DC conversion with fast transient
response and accurate regulation in the smallest possible PCB area. With a minimum of external components,
the LM2832 is easy to use. The ability to drive 2.0A loads with an internal 150 mΩ PMOS switch using state-of-
the-art 0.5 µm BiCMOS technology results in the best power density available. The world-class control circuitry
allows on-times as low as 30ns, thus supporting exceptionally high frequency conversion over the entire 3V to
5.5V input operating range down to the minimum output voltage of 0.6V. Switching frequency is internally set to
550 kHz, 1.6 MHz, or 3.0 MHz, allowing the use of extremely small surface mount inductors and chip capacitors.
Even though the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is
included, featuring an ultra-low stand-by current of 30 nA. The LM2832 utilizes current-mode control and internal
compensation to provide high-performance regulation over a wide range of operating conditions. Additional
features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal
shutdown, and output over-voltage protection.
Typical Application Circuit
R3
V_IN = 5V
C1
EN
FB
LM2832 ^GND
V_IN
SW
L1
D1
V_O = 3.3V @ 2.0A
R1
C2
C3
R2
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated