Features: ` Output voltage options:
2.0V ± 5%, 1.8V ± 5%, 1.5V ± 6%
` 120mA output current capability
` Multi-Gain and Gain Hopping for Highest Possible Efficiency - up to 90% Efficient
` 2.6V to 5.5V input range
` Low operating supply current: 32A
` Shutdown supply current: 0.1A
` Thermal and short circuit protection
` Available in an 8-Pin MSOP PackageApplication· Cellular Phones
· Pagers
· H/PC and P/PC Devices
· Portable Electronic Equipment
· Handheld InstrumentationPinout
Specifications
| Output Current |
120 mA |
| Output Min |
2.0 Volt |
| Output Max |
2.0 Volt |
| Adjustable Output |
No |
| Input Min Voltage |
2.6 Volt |
| Input Max Voltage |
5.5 Volt |
| Frequency Min |
500 kHz |
| Frequency Max |
500 kHz |
| Efficiency (peak) |
90 % |
| Adj Switch Frequency |
No |
| On/Off Pin |
Yes |
| Quiescent Current |
0.032 mA |
| PWM Mode |
Multiple Fractional Gain SwCap |
| Topology |
SwCap Buck |
| Step-Down |
Yes |
| Step-Up |
No |
| Inverting |
No |
| RegType |
Switched Cap Regulator |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
| View Using Catalog |
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
VIN, EN pins: Voltage to Ground
(Note 3) ........................................................−0.3V to 5.6V
Junction Temperature (TJ-MAX-ABS) .........................150°C
Continuous Power Dissipation
(Note 4) ...................................................Internally Limited
VOUT Short-Circuit to GND Duration
(Note 4) ................................................................Unlimited
Storage Temperature Range................... −65°C to 150°C
Lead Temperature
(Soldering, 5 Sec.) ...................................................260°C
ESD Rating (Note 5)
Human-body model:.......................................................2KV
Machine model ..........................................................200KV
DescriptionThe LM2788 switched capacitor step-down DC/DC converter efficiently produces a 120mA regulated low-voltage rail from a 2.6V to 5.5V input. Fixed output voltage options of 1.5V, 1.8V, and 2.0V are available. The LM2788 uses multiple fractional gain configurations to maximize conversion efficiency over the entire input voltage and output current ranges. Also contributing to high overall efficiency is the extremely low supply current of the LM2788: 32µA operating unloaded and 0.1µA in shutdown.
The optimal external component requirements of the LM2788 solution minimize size and cost, making the part ideal for Li-Ion and other battery powered designs. Two 1µF flying capacitors and two 10µF bypass capacitors are all that are required, and no inductors are needed.
The LM2788 also features noise-reducing soft-start circuitry, short-circuit protection and over-temperature protection.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM2788MM-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM2788MM-1.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM2788MMX-1.5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM2788MMX-1.8 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.For more information on Reliability Metrics, please click here.
More Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-1209: Application Note 1209 LM2787 Evaluation Board |
33 Kbytes |
10-May-04 |
Download |
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|
LM2788 Data Sheet
