RT5035A/B
Part.B : 2AA (SHDN_PFM1 = 1)
BAT
Battery Installed
And BATUVLO goes LOW
0V
PWM operation
5.0V (for instance)
PFM operation
PFM operation
3.6V
3.6V
VOUT1
5V
0V
3.6V
3.6V
VM(internal)
3.1V
3.1 or BAT
VDDM
0V
VDDM>2.4V and RTCOSC stable
/RESET
(Sync with C32K)
EN pin
VREF, OSC, OTP, VDDM_UVLO, SEQ detection are ready.
REF_GOOD
CH3
ENDLY3
SHDLY3
ENDLY2
CH2
CH4
ENDLY4
ENDLY10
A13.SHDN_EN10=0
CH10
SHDLY2=0
SHDLY4=0
SHDLY10=0
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 =
1)
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5035A/B-03 February 2020
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
