BC3770 Datasheet, PDF (18/45 Pages) Freescale Semiconductor, Inc – 2.0 A Switch-Mode Charger

DEVICE IN STANDBY/
SHUTDOWN MODE
- VBUS < VUV LO
- SUSPEND=0
- I2C not available if SHDNB=N
- I2C active if SHDNB=H
Q4=ON
Valid VBUS attached
CHARGING Resumes automatically
at where the suspended occurred
QUALIFICATION PROCESS
FOR CHARGER ENABLE
- VUVLO < VBUS < VOVP
- Battery Presence Detection
Each condition
released
- BATREG < BAT_OVP
-Die Temp < 130C
-VBUS > BATREG+150mV
CHARGING SUSPENDED
- CHGENB=LOW
- Interrupt triggered
- CHGEN=1
-POK=H
-VL=ON
BAT < 2.5V
Toggle CHGEN bit
or
t oggle CHGENB pin
or
Re-Attach VBUS input
- Timer Reset
- VBUS < UVLO or
- VL=OFF or
- CHGEN=0 or
- CHGENB=HIGH
TRICKLE CHARGE MODE
- VBUS > OVP or
- Die Temp > 130C or
-VSYS =3.6 V
- BAT OVP detected
- ICHG=90mA
- I2C Active
2.5V = BATREG
PRE-CHARGE MODE
-VSYS=3.6V
- ICHG=150mA(Default)
- I2C Active
Pre-charge timer=ON
BATREG > 3.6V &
Soft -Start w/ 2ms
=_T3_iT._m6_imV_{eeoouTutTimtiamaenenrdr--dOOBuuBAttA&&TTRBB&RAA}E_TE^T_TR^GGR_-OE1^{EG<<P0G<30V_<V.6O}_Bm³_BAAVV^._F⁶_{TTVVV_B_FR-RB1EA&AG0EdTT0GeRRtm&BEtEGVeTAGo-TcV&p_-tOB-eRtFABVdFTEA_BdRTC_eEARHteGTEcGtC_e?dHRGEG}
=
TIMER FAULT
- Interrupt triggered
Any Charging
State
-Re ch^R_Va^Er_Bg^C_A-e₁^H_TI_0R^An_0Et^Re_G&^G_mrr ^Eu_-TVp_VO^Mt_&Bg_P^O_Ae_{t_}^D_Tn_{BO_}^Ee_ARr_TFa_{E_F}te_RGd_{Ed=CeHteG-c1&t0VeTB0domApT-OVRFE&FGd-teBVtABeTAct_eTRd_}^V_EREC^B_HG^A_G^-_?^1T0R0EG&m-TVVO&^-B1P^A0Vt__T^0TBBoOm^_AApRT_V-^T_OF^RE__fE&F_f^R_d^GGe_t-B^Ed_tVe⁼_A^C_ce_BTteA^H_{_}t_de_TR^G_{_E}c_RCEt_He_GGd_&?
FAST-CHARGE MODE
TOP-OFF MODE
Top-Off timer
-VSYS=Track BATREG
- ICHG=500mA(Default)
- I2C Activee
Fast-charge timer=ON if enabled
BATREG
=VBA T_REG
&
-VSYS=BATREG+ ICHG x RDSON_Q4
- I2C Act ive
- Top-Off timer=ON
- Top-Off Interrupt triggered
expires
AUTOSTOP=1
?
YES
ICHG =Itop -off
NO
DONE MODE
-VSYS=VB AT_REG
- I2C Active
- DONE Interrupt triggered
- ICHG=0mA
- Charger stopped
CV MODE
- VSYS= VBAT_R EG
- I2C Active
- DONE Interrupt triggered
- Charger kept ON in CV mode
Figure 6. Charger State Diagram
Analog Integrated Circuit Device Data
Freescale Semiconductor
BC3770
18