Maker : National Semiconductor
Part No. : LM3351MM

  Datasheet PDF : LM3351MM.pdf
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Product Information

LM3351 Switched Capacitor Voltage Converter December 1999 LM3351 Switched Capacitor Voltage Converter General Description The LM3351 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 LM3351 is pin for pin compatible with the LM3350 but consumes 66% less quiescent current. The LM3351 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 n 4.2Ω typical step-up output impedance 1.8Ω typical step-down output impedance 95% typical power conversion efficiency at 50 mA 250 nA typical shutdown current Low quiescent current extends battary life 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 200 kHz switch frequency allows use of very small, inexpensive capacitors. Ordering Information Order Number LM3351MMX LM3351MM Package Type Mini SO-8 Mini SO-8 NSC Package Drawing MUA08A MUA08A Package Marking S05A S05A Supplied As 3500 Units on Tape and Reel 1000 Units on Tape and Reel Basic Operating Circuits Step-Up Converter Step-Down Converter DS100146-1 DS100146-2 Connection Diagram Mini SO8 Package DS100146-3 Top View © 1999 National Semiconductor Corporation DS100146 www.national.com LM3351 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, C1, C2, Cin and Cout = 1 µF. 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) Iload = 0 A Iload = 50 mA Conditions Typ (Note 4) 5.0 4.7 3.3 2.5 3.65 IQ1 IQ2 Zout fSW 0.025 3 1.1 1.5 4.2 6.25 200 125 275 VEnable 1.7 1.0 2.5 IEnable Pη 0.025 1 95 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, C1, C2, Cin and Cout = 1 µF. 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 Iload = 0 A Iload =50 mA Typ (Note 4) 3.3 3.2 5 Limits (Note 5) Units V V V 2.2 5.5 0.25 3 V(Min) V...

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