Maker : National Semiconductor
Part No. : LM3350

  Datasheet PDF : LM3350.pdf
  Cross Reference : LM3350 Cross Reference
  Buy Component : LM3350 Find Stock and Price

Shortcut : LM335  LM335  LM335  LM3350  LM3350MM  LM3350MMX  LM3351  LM3351MM  LM3351MMX  LM3352  LM3352MTC-2.5  LM3352MTC-3.0  LM3352MTC-3.3  LM3352MTCX-2.5  LM3352MTCX-3.0  LM3352MTCX-3.3  LM3354  LM3354-37  LM3354MM-1.8  LM3354MM-3.3  LM3354MM-3.7  LM3354MM-4.1  LM3354MM-5.0  LM3354MMX-1.8  LM3354MMX-3.3  LM3354MMX-3.7  LM3354MMX-4.1  LM3354MMX-5.0  LM3355  LM335A  LM335A  LM335A  LM335AH  LM335AZ  LM335H  LM335M  LM335Z  LM335Z 

Product Information

LM3350 Switched Capacitor Voltage Converter December 1999 LM3350 Switched Capacitor Voltage Converter General Description The LM3350 is a CMOS charge-pump voltage converter which efficiently provides a 3.3V to 5V step-up, or 5V to 3.3V step-down. The LM3350 uses four small, low cost capacitors to provide the voltage conversion. It eliminates the cost, size and radiated EMI related to inductor based circuits, or the power loss of a linear regulator. Operating power conversion efficiency greater than 90% provides ideal performance for battery powered portable systems. The architecture provides a fixed voltage conversion ratio of 3/2 or 2/3. Thus it can be used for other DC-DC conversions as well. n n n n 4.2Ω typical step-up output impedance 1.8Ω typical step-down output impedance 90% typical power conversion efficiency at 50 mA 250 nA typical shutdown current Features n Conversion of 3.3V to 5V, or 5V to 3.3V n Small Mini SO-8 package n No inductor required Applications n n n n Any mixed 5V and 3.3V system Laptop computers and PDAs Handheld instrumentation PCMCIA cards Key Specifications n 800 kHz switch frequency allows use of very small, inexpensive capacitors. Ordering Information Order Number LM3350MMX LM3350MM Package Type Mini SO-8 Mini SO-8 NSC Package Drawing MUA08A MUA08A Package Marking S00A S00A Supplied As 3500k Units on Tape and Reel 1000 Units on Tape and Reel Basic Operating Circuits Step-Up Converter Step-Down Converter DS100002-1 DS100002-2 Connection Diagram Mini SO8 Package DS100002-3 Top View © 1999 National Semiconductor Corporation DS100002 www.national.com LM3350 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Input Voltage, Step-Down Maximum Input Voltage, Step-Up Power Dissipation (PD) (TA=25˚C, (Note 2)) θja (Note 2) Tj Max (Note 2) 5.5V 3.65V 500 mW 250˚C/W 150˚C Storage Temperature Lead Temperature (Soldering, 10 secs) ESD Susceptibility (Note 3) Not short circuit protected. −65˚C to +150˚C 260˚C 2kV Operating Conditions (Note 1) Ambient Temperature Range −40˚C to + 85˚C Electrical Characteristics 3/2 Step-Up Voltage Converter Specifications in standard type face are for Tj = 25˚C, and those with boldface type apply over full operating temperature range. Unless otherwise specified, Vin = 3.3V, VEnable = 3.3V, Iload = 50 mA. Symbol VoutNL VoutFL Vin Parameter Output Voltage at No Load Output Voltage at 50 mA Input Supply Voltage Range Quiescent Current Quiescent Current Output Source Impedance Switching Frequency Enable Threshold Voltage Leakage Current Power Efficiency Current into ENABLE pin; ENABLE = 5V and all other pins at ground Shutdown Mode, VEnable = 0V, Iload=0 A; Current into pin Vlow Normal Mode, IIoad = 0A; Current into pin VIow Iload = 50 mA (Note 6) Conditions C1, C2, Cin and Cout: 0.33µF, esr ≤ 0.33 Ω at 1MHz. Iload = 0 A C1, C2, Cin and Cout: 0.33µF, esr ≤ 0.33 Ω at 1MHz. Iload = 50 mA Typ (Note 4) 5.0 4.7 3.3 2.5 3.65 IQ1 IQ2 Zout fSW 0.025 3 3.75 5 4.2 6.25 800 500 1100 VEnable 1.7 1.0 2.5 IEnable Pη 0.025 1 90 Limits (Note 5) Units V V V V(Min) V(Max) µA µA(Max) mA mA(Max) Ω Ω (Max) kHz kHz(Min) kHz(Max) V V(Min) V(Max) µA µA(Max) % Electrical Characteristics 2/3 Step-Down Voltage Converter Specifications in standard type face are for Tj = 25˚C, and those with boldface type apply over full operating temperature range. Unless otherwise specified, Vhigh = 5V, VEnable = 5V, Iload = 50 mA. Symbol VoutNL VoutFL Vin Parameter Output Voltage at No Load Output Voltage at 50 mA Input Supply Voltage Range Quiescent Current Shutdown Mode, VEnable = 0V, Iload=0 A; Current into pin Vhigh 2 Conditions C1, C2, Cin and Cout: 0.33µF, esr ≤ 0.33 Ω at 1MHz. Iload = 0 A C1, C2, Cin and Cout: 0.33 µF, esr ≤ 0.33Ω at 1MHz. Iload =50 mA Typ (Note 4) 3.3 3.2 5 Limits (Note 5) Unit...

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