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CAT3606 Datasheet(PDF) 4 Page - Catalyst Semiconductor |
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CAT3606 Datasheet(HTML) 4 Page - Catalyst Semiconductor |
4 / 11 page CAT3606 4 Doc. No. 5009, Rev. B © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice BLOCK DIAGRAM BASIC OPERATION At power-up, the CAT3606 starts operation in 1x mode. If it is able to drive the programmed LED current, it continues in 1x mode. If the battery voltage drops to a level where the LED current cannot be met, the driver automatically switches into 1.5x mode, to boost the output voltage high enough to achieve the nominal LED current. The above sequence is reinitialized each and every time the chip is powered up or is taken out of shutdown mode (via EN pin). The use of the Main and Sub display enable pins ( ENM or ENS) does not affect the mode of operation. Figure 1: CAT3606 Functional Block Diagram LED CURRENT SETTING The LED current is set by the external resistor RSET connected between the RSET pin and ground. Table 1 lists various LED currents and the associ- ated RSET resistor value for standard 1% precision surface mount resistors. ) A m ( t n e r r u C D E LR T E S k ( Ω Ω Ω Ω Ω) 19 4 6 27 8 2 52 0 1 0 19 . 9 4 5 14 . 2 3 0 27 . 3 2 0 34 . 5 1 Table 1. RSET Resistor Selection 1.2V Reference 1MHz Oscillator Mode Control 1x mode (LDO) 1.5x Charge Pump VIN CIN + - 3 ≤VIN≤4.2V Battery EN RSET ENM ENS LED1 LED2 LED3 LED4 LED5 LED6 LED Output Selection 6 Current Sink Regulators COUT 20mA VOUT C1- C2- C1+ C2+ Sub Main GND Current Setting |
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Descripción similar - CAT3606 |
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