RT5035B datasheet(25/44 Pages) RICHTEK

25 / 44 page

RT5035A/B

is a registered trademark of Richtek Technology Corporation.

DS5035A/B-02

February

2017

www.richtek.com

Part.B : 2AA (SHDN_PFM1 = 1)

EN pin

REF_GOOD

VREF, OSC, OTP, VDDM_UVLO, SEQ detection are ready.

CH3

CH2

CH4

VOUT1

5.0V (for instance)

BAT

Battery Installed

And BATUVLO goes LOW

ENDLY3

ENDLY2

ENDLY4

CH10

ENDLY10

PFM operation

PWM operation

VDDM

3.1 or BAT

3.1V

3.6V

PFM operation

VM(internal)

A13.SHDN_EN10=0

/RESET

VDDM>2.4V and RTCOSC stable

(Sync with C32K)

SHDLY2=0

SHDLY4=0

SHDLY10=0

SHDLY3

3.6V

CH1 :

For 2AA case, as long as the BAT voltage is higher than UVLO and EN pin = L, CH1 keeps working in PFM mode

3.6V (default SHDN_EN1 = 1). However, when A14.PWM1 = 1, EN pin = H and the VDDM voltage is higher than

UVLO, CH1 will switch from PFM mode to PWM mode.

As for Li battery case, to save electricity, when BAT voltage is higher than UVLO and EN pin = L, the CH1 would be

off and truly shutdown (default SHDN_EN1 = 0)

CH2/3/4 :

CH2, CH3 and CH4 are both enabled by EN pin and with turn on delay time defined in I2C register A9 to A10.

CH10 :

CH10 is also equipped PFM operation to reduce operating quiescent current for memory self-refresh application.

When EN = H, I2C registers can be set to ready to get into standby mode. (Set SHDN_EN1 = 1 and SHDN_EN10 =

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