LM3262 Datasheet, PDF (1/41 Pages) Texas Instruments – Miniature, Adjustable, Step-Down DC-DC Converter

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LM3262
SNVS875O – AUGUST 2012 – REVISED DECEMBER 2015
LM3262 6-MHz, 800-mA Miniature, Adjustable, Step-Down DC-DC
Converter With Auto Bypass for RF Power Amplifiers
1 Features
•1 Operates from a Single Li-Ion Cell (2.5 V to 5.5 V)
• 6-MHz (Typical) PWM Switching Frequency
• Adjustable Output Voltage (0.4 V to 3.6 V)
• 800-mA Maximum Load Capability (up to 1 A in
Bypass Mode)
• High Efficiency (93% Typical at 3.8 V_IN, 3.4 V_OUT
at 500 mA)
• Automatic ECO/PWM/BP Mode Change
• Current and Thermal Overload Protection
• Multi-Function VCON Pin
(Eliminates Need for Separate BPEN Control)
• Soft-Start Function
• Small Chip Inductor in 0805 (2012) Case Size
• 25-µA (Typical) I_Q in Sleep Mode
• 5-µs (Typical) Rise Time and Fall Time for
2-V Step
• 9-Pin DSBGA Package
2 Applications
• HSUPA, LTE Cellular Phones
• TD-SCDMA and TD-LTE
• Hand-Held Radios
• RF PC Cards
• Battery-Powered RF Devices
• USB-Powered Portable Applications
3 Description
The LM3262 is a DC-DC converter optimized for
powering RF power amplifiers (PAs) from a single
lithium-ion cell; however, it may be used in many
other applications such as USB-powered portable
applications. The device 2.5-V to 5.5-V input voltage
can be stepped down to an adjustable output voltage
range from 0.4 V to 3.6 V. Output voltage is set using
a VCON analog input which enables improved RF-
stage PA efficiencies.
The LM3262 offers five modes of operation. In pulse
width modulation (PWM) mode the device operates at
a fixed frequency of 6 MHz (typical), which minimizes
RF interference at medium-to-low loads. At light load,
the device enters into ECO mode automatically and
operates with reduced switching frequency. In ECO
mode, the quiescent current is reduced and extends
the battery life. Shutdown mode turns the device off
and reduces battery consumption to 0.1 µA (typical).
At low-battery condition, bypass mode reduces the
voltage dropout to less than 50 mV (typical). The
device also features a sleep mode.
The LM3262 is available in a 9-pin, lead-free DSBGA
package. A high-switching frequency (6 MHz) allows
use of only three tiny surface-mount components: one
inductor and two ceramic capacitors.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3262
DSGBA (9)
1.51 mm × 1.385 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
2.5 V to 5.5V
Typical Application Circuit
10 PF
GPO1
DAC
VIN
BPEN
SW
EN
LM3262
FB
VCON
SGND PGND
VOUT = 2.5 x VCON
0.5 PH _{0.4 V to 3.6 V}
4.7 PF
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.