LM2750 Datasheet, PDF (1/29 Pages) National Semiconductor (TI) – Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter

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LM2750, LM2750-ADJ
SNVS180N – APRIL 2002 – REVISED APRIL 2016
LM2750 Low-Noise Switched-Capacitor Boost Regulator
1 Features
•1 Wide Input Voltage Range: 2.7 V to 5.6 V
• Inductorless Solution: Application Requires Only
Three Small Ceramic Capacitors
• Fixed 5-V Output and Adjustable Output Voltage
Options Available
• 85% Peak Efficiency
– 70% Average Efficiency Over Li-Ion Input
Range (2.9 V to 4.2 V)
• Output Current up to 120 mA With 2.9 V ≤ V_IN ≤
5.6 V
– Output Current up to 40 mA With 2.7 V ≤ V_IN ≤
2.9 V
• Fixed 1.7-MHz Switching Frequency for a Low-
Noise, Low-Ripple Output Signal
• Pre-Regulation Minimizes Input Current Ripple,
Keeping the Battery Line
(V_IN) Virtually Noise-Free
• Shutdown Supply Current Less Than 2 µA
• Tiny WSON Package With Outstanding Power
Dissipation: Usually No Derating Required
2 Applications
• White and Colored LED-Based Display Lighting
• Cellular Phone SIM Cards
• Audio Amplifier Power Supplies
• General Purpose Li-Ion-to-5-V Conversion
• EPOS Barcode Scanners
• Industrial Handheld Radios
3 Description
The LM2750 is a regulated switched-capacitor
doubler that produces a low-noise output voltage. The
5-V output voltage option (LM2750-5.0) can supply up
to 120 mA of output current over a 2.9-V to 5.6-V
input range, as well as up to 40 mA of output current
when the input voltage is as low as 2.7 V. An
adjustable output voltage option with similar output
current capabilities is also available (LM2750-ADJ).
The LM2750 has been placed in TI's 10-pin WSON, a
package with excellent thermal properties that keeps
the part from overheating under almost all rated
operating conditions.
A perfect fit for space-constrained, battery-powered
applications, the LM2750 requires only three external
components: one input capacitor, one output
capacitor, and one flying capacitor. Small,
inexpensive ceramic capacitors are recommended for
use. In conjunction with the
1.7-MHz fixed switching frequency of the LM2750,
these capacitors yield low output-voltage ripple, which
is beneficial for systems requiring a low-noise supply.
Pre-regulation minimizes input current ripple, thus
reducing input noise to negligible levels.
A tightly controlled soft-start feature limits inrush
currents during part activation. Shutdown completely
disconnects the load from the input. Output current
limiting and thermal shutdown circuitry protect both
the LM2750 and other connected devices in the event
of output shorts or excessive current loads.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2750
LM2750-ADJ
WSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
2.7 V to 5.6 V
Typical Application Circuit
8, 9
VIN
VOUT
CIN
2.2 PF
LM2750-5.0
IOUT up to 120 mA, (VIN t 2.9 V)
IOUT up to 40 mA, (VIN t 2.7 V)
1, 2
VOUT
5 V ± 4%
COUT
2.2 PF
4
SD
Capacitors: 1 PF - TDK C1608X5R1A105K
2.2 PF - TDK C2012X7R1A225K
CAP+ ¹⁰
GND
CAP-
7
3, 5, 6, DAP
CFLY
1 PF
Copyright © 2016, Texas Instruments Incorporated
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.