LM2773_15 Datasheet, PDF (1/18 Pages) Texas Instruments – LM2773 Low-Ripple 1.8V/1.6V Spread-Spectrum Switched Capacitor Step-Down Regulator

LM2773
www.ti.com
SNVS554A – JANUARY 2008 – REVISED MAY 2013
LM2773 Low-Ripple 1.8V/1.6V Spread-Spectrum Switched Capacitor Step-Down Regulator
Check for Samples: LM2773
FEATURES
1
•2 Low-Noise Spread Spectrum Operation
• 1.8V/1.6V Selectable Output Voltage
• 2% Output Voltage Regulation
• > 75% Efficiency in 1.8V Mode
• Very Low Output Ripple: 10mV @ 300mA
• Output Currents up to 300mA
• 2.5V to 5.5V Input Voltage Range
• Shutdown Disconnects Load from V_IN
• 1.15MHz Switching Frequency
• No Inductors…Small Solution Size
• Short Circuit and Thermal Protection
• 0.5mm pitch, DSBGA-9 (1.511 × 1.511mm ×
0.6mm)
DESCRIPTION
The LM2773 is a switched capacitor step-down
regulator that produces a selectable 1.8V or 1.6V
output. It is capable of supplying loads up to 300mA.
The LM2773 operates with an input voltage from 2.5V
to 5.5V, accommodating 1-cell Li-Ion batteries and
chargers.
The LM2773 utilizes a regulated charge pump with
gains of 2/3x and 1x. It has very low ripple and noise
on both the input and output due to its pre-regulated
1.15MHz (typ.) switching frequency and spread
spectrum operation. When output currents are low,
the LM2773 automatically switches to a low-ripple
PFM regulation mode to maintain high efficiency over
the entire load range.
The LM2773 is available in TI's 0.5mm pitch 9-bump
DSBGA.
APPLICATIONS
• Power Supply for DSP's, Memory, and
Microprocessors
• Mobile Phones and Pagers
• Digital Cameras, Portable Music Players, and
Other Portable Electronic Devices
Typical Application Circuit
V_IN = 2.5V to
5.5V
C_IN
1 PF
V_IN
GND
V_OUT: 1.8V or 1.6V
I_OUT up to 300 mA
V_OUT
LM2773
C_OUT
4.7 PF
C2+
C2
1 PF
C2-
EN
C1+
C1-
SEL
C1
1 PF
Capacitors: 1 PF - C1005 (0402), X5R, 6.3V
4.7 PF - C1608 (0603), X5R, 6.3V
or equivalent
Figure 1.
Figure 2. LM2773 Efficiency vs.
Low-Dropout Linear Regulator (LDO) Efficiency
1
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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.
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