CE8301 Series. Introduction. Features. Ordering Information. Applications SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER

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1 SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER Introduction The is a CMOS PFM-control step-up switching DC/DC converter that mainly consists of a reference voltage source, an oscillator, and a comparator. The PFM controller allows the duty ratio to be automatically switched according to the load (light load: 50%, high output current: 75%), enabling products with a low ripple over a wide range, high efficiency, and high output current. With the, a step-up switching DC/DC converter can be configured by using an external coil, capacitor, and diode. The built-in MOS FET is turned off by a protection circuit when the voltage at the LX pin exceeds the limit to prevent it from being damaged. This feature, along with the mini package and low current consumption, makes the ideal for applications such as the power supply unit of portable equipment. Features Low voltage operation: Startup at 0.9 V min. (I OUT = 1 ma) guaranteed Duty ratio: 66/78%, builtin auto switching type PFM controller External parts: Coil, capacitor, diode Output voltage: Settable to between 1.8 to 6.5 V in 0.1 V steps Accuracy of ±2% High efficiency:85%(typ.) Standard function (product type A) Shutdown function (product type C D) Output voltage Adjustable type (product type E F) External transistor type available (product type B E F) Applications Ordering Information Power supply for portable equipment such as digital cameras, electronic notebooks, and PDAs Power supply for audio equipment such as portable CD/MD players Constant voltage power supply for cameras, video equipment, and communications equipment Power supply for microcomputers

2 Block Diagrams Pin Assignment Table 1 CE8301A Series(SOT-23-3 PKG) 1 V OUT Output voltage pin 2 V SS GND pin 3 LX External inductor connection pin Table 2 CE8301B Series(SOT-23-3 PKG) 1 V OUT Output voltage pin 2 V SS GND pin 3 EXT External transistor connection pin Table 3 CE8301C Series(SOT-23-5 PKG) 1 EN Shutdown pin H : Normal operation L : Step-up stopped 2 V OUT Output voltage pin 3 NC (N.C.) 4 V SS GND pin 5 LX External transistor connection pin Table 4 CE8301D Series(SOT-23-5 PKG) 1 EN Shutdown pin H : Normal operation L : Step-up stopped 2 V OUT Output voltage pin 3 NC (N.C.) 4 V SS GND pin 5 EXT External transistor connection pin

3 Table 5 CE8301 ESeries(SOT-23-5 PKG) Output voltage fixed output type; 1 VOUT Output voltage monitoring pin (FB) (Output voltage external setting type; Feedback pin) 2 V DD IC power supply pin 3 NC (N.C.) 4 V SS GND pin 5 LX External transistor connection pin Table 6 CE8301 FSeries(SOT-23-5 PKG) Output voltage fixed output type; 1 VOUT Output voltage monitoring pin (FB) (Output voltage external setting type; Feedback pin) 2 V DD IC power supply pin 3 NC (N.C.) 4 V SS GND pin 5 EXT External transistor connection pin Table 7 CE8301A Series (SOT-89-3 PKG) 1 V SS GND pin 2 V OUT Output voltage pin 3 LX External inductor connection pin Table 8 CE8301B Series (SOT-89-3 PKG) 1 V SS GND pin 2 V OUT Output voltage pin 3 EXT External transistor connection pin Table 9 CE8301E Series (SOT-89-5 PKG) 1 NC (N.C.) 2 V DD IC power supply pin Output voltage fixed output type; 3 VOUT Output voltage monitoring pin (FB) (Output voltage external setting type; Feedback pin) 4 LX External transistor connection pin 5 V SS GND pin Table 10 CE8301F Series(SOT-89-5 PKG)

4 1 NC (N.C.) 2 V DD IC power supply pin Output voltage fixed output type; 3 VOUT Output voltage monitoring pin (FB) (Output voltage external setting type; Feedback pin) 4 EXT External transistor connection pin 5 V SS GND pin Absolute Maximum Ratings (Unless otherwise specified, Ta= 25 C) Parameter Symbol Ratings Unit VOUT pin voltage V OUT V SS -0.3 ~ V SS +10 V EN pin voltage EN V SS -0.3 ~ V SS +10 V LX pin voltage V LX V SS -0.3 ~ V SS +10 V LX pin current I LX 1000 ma SOT mw Power SOT-23-5 PD 250 mw dissipation SOT mw Operating temperature Topr -40 ~+85 C Storage temperature Tstg -40 ~+125 C Electrical Characteristics (Unless otherwise specified, Ta = 25 C) Parameter Symbol Conditions Min. Typ. Max. Unit Output voltage V OUT - V OUT(S) 0.98 V OUT V OUT(S) 1.02 Input voltage V IN V Operation start voltage V ST1 I OUT = 1 ma V Oscillation start voltage V ST2 No external parts, voltage applied to V OUT LX pulled up V to V OUT via 300Ω resistor Current consumption 1 I SS1 V OUT =0.95 V OUT :3.0V µa V OUT V OUT :5.0V µa Current consumption 2 I SS2 V OUT =V OUT +0.5 V µa Current consumption during I SSS V EN = 0 V µa shutdown Switching current I SW V LX = 0.4 V ma Switching transistor No external parts, I SWQ leakage current V LX=V OUT =10 V,V EN = 0 V µa Line regulation V OUT1 V IN = 0.4 V OUT ~ 0.6 V OUT mv V

5 Load regulation V OUT2 I OUT = 10 µa ~ 50mA mv Maximum Oscillation frequency Duty ratio 1 Duty ratio 2 f OSC V OUT= 0.95 V OUT,measure waveform at LX pin 100 khz V OUT = 0.95 V OUT, Duty1 measure waveform at % LX pin Duty2 Measure waveform at LX pin with light load % Efficiency EFFI 85 % Shutdown pin input voltage V SH V SL1 V OUT =0.95 V OUT,judge oscillation at LX pin V V OUT = 0.95 V OUT, judge stop at LX pin V Shutdown pin input I SH V EN =10V µa current I SL V EN =0V µa Remark: V IN =V OUT(S) 0.6 applied, I OUT= V OUT(S) / 250 Ω Shutdown function built-in type: EN pin is connected to V OUT V OUT(S) specified above is the set output voltage value, and V OUT is the typical value of the actual output voltage. Standard Circuits 1 CE8301A Circuits: 2 CE8301C Circuits:

6 3 CE8301B Circuits: 4 CE8301D Circuits: 5 CE8301E Circuits: 6 CE8301F Circuits:

7 Characteristics 1. CE8301A30P: a V OUT vs. I OUT : b. Efficiency vs. I OUT :

8 2. CE8301A33P: a V OUT vs. I OUT : b Efficiency vs. I OUT :

9 3. CE8301A50P: a. V OUT vs. I OUT : b. Efficiency vs. I OUT :

10 Package information SOT-23 SOT-89 Symbols Dimensions in millimeters Min Nom Max A b b b C D E E θ L L

11 SOT SOT- 89-5

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