Group: TOSHIBA
Catalog excerpts
TOSHIBA CMOS Integrated Circuit Silicon Monolithic System Power IC 1. Overview TC7738WBG is a system power IC which builds in 6 channels of a buck DC-DC convertor and 2 channels of LDO. The IC operation voltage(3.3 V or 5 V) can be changed using I2C interface and pin settings, power supply can be provided to various systems. In addition, this product incorporates the PROTECTION-SW for the input protection. (*Refer to as hereinafter, Channel: CH, DC-DC convertor: DC-DC) SSD (Solid State Drive), portable devices, etc. 3. Features • Power supply voltage (VIN):2.9 V to 5.5 V (PVIN1 to 6):2.9 V to 5.5 V (LDO1_IN): 2.9 V to 5.5 V • IC operation condition setting when the power supply voltage is set to 3.3 V/5.0 V by MODE_SEL pin. • 6 CH DC-DC convertor + 2 CH LDO ■ LDO1: 2.325 V to 2.700 V / 1.625 V to 2.000 V (25 mV step), 0.3 A (MAX) ■ LDO2: 3.125 V to 3.500 V (25 mV step), 0.3 A (MAX) • Built-in BYPASS-SW: CH1, LDO2 • Built-in LOAD-SW: CH5 • Efficiency control in the case of the light load (PWM/PFM operation) • Control by I2C interface • Initial values selection of DC-DC (CH1 to CH6) and LDO1 output by VSEL0 pin • Built-in input PROTECTION-SW • Built-in protection functions ■ Low input voltage detection circuit (UVLO) ■Input power supply Over Voltage Protection (OVP_1) ■Input power supply Over Current Limitation (OCL_1) ■Input power supply Over Current Protection (OCP) ■Output Over Voltage Protection (OVP_2) ■Output Under Voltage Protection (UVP) ■Output Over Current Limitation (OCL_2) ■Thermal Shutdown protection (TSD) • Package: S-UFBGA45-0403-0.40-001 (2.91 mm *3.31 mm, 0.4 mm Pitch)
Open the catalog to page 1TC7738WBG 6. I/O Equivalent Pin Circuit Table 6.1 I/O Equivalent Pin Circuit Note: Equivalent circuit is simplified to understand. Pin name VIN
Open the catalog to page 4Note: Equivalent circuit is simplified to understand
Open the catalog to page 5Input protection block RESETn detection Output control block Block diagram Note: Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified for explanatory purposes.
Open the catalog to page 68. Functional specifications 8.1. Operation description TC7738WBG consists with PROTECTION-SW for the input protection, 6 channels of DC-DC and 2 channels of LDO. When the voltage is applied to the VIN, PROTECTION-SW is turned on, supplied to the output control block, and each 2 channels start to output. Since it includes I C interface, various settings such as output voltage can be set. Since using MODE_SEL pin enables setting of RESET n and OVP_1 threshold voltage, both 3.3 V and 5 V system can be used. Moreover, VSEL0 pin input enables default output voltage setting of each channel. 8.2....
Open the catalog to page 7Input overvoltage protection (OVP_1) This product incorporates an input overvoltage protection (OVP_1) circuit and the threshold is determined by MODE_SEL pin setting. When VIN voltage exceeds OVP detection value, PROTECTION-SW is turned off. It is turned on after the voltage is returned to less than OVP deactive voltage. Table 8.2 OVP_1 voltage MODE_SEL OVP_1 detection (rise) OVP_1 deactive (fall) PROTECTION-SW DC-DC / LDO RESETn pin Soft start function If VIN input voltage exceeds UVLO deactive voltage, VOUT voltage rises with the soft start function. This product incorporates 200 mA...
Open the catalog to page 8Current limitation function (OCL_1) / Over current protection (OCP) If the current which flows into PROTECTION-SW reaches OCL current value, the input current is limited (min 4.5 A). (1) Output stopped by OCP If the input OCL state continues for 100 μs, all channels are stopped, registers are initialized, and RESETn changes from H to L. Additionally the internal OCP counter is counted up 1. When the input OCL state is reset by channel stop, each channel restarts up according to startup sequence. Output stopped by VOUT voltage dropping If the VOUT voltage is dropped by increasing output...
Open the catalog to page 98.3. Output control block When PROTECTION-SW is turned on and supplied voltage to VOUT, the output control block starts operation. It can be set by output voltage, input pin of each channel, and register setting by I2C. 8.3.1. RESETn detection operation RESET n pin outputs signals to be noticed the completion of TC7738WBG startup sequence to external systems. When VOUT voltage exceeds RESETn deactive threshold, and reaches VIN voltage after power on, the startup sequence is started, and RESET n pin outputs from L to H after passing regulation delay time. Additionally if VOUT voltage is...
Open the catalog to page 10TC7738WBG RESETn deactive/detection operation (rising/falling operation) (1) VOUT UVLO deactive detection signal RESETn deactive detection signal DC-DC/LDO operation start RESETn pin output signal VSEL0 = L:10ms (typ.) Note: UVLO deactive detection signal and RESETn deactive detection signal are internal signals. RESETn deactive/detection operation (VSEL0 ="L", MODE_SEL ="L") Note: UVLO deactive detection signal and RESETn deactive detection signal are internal signals. RESETn deactive/detection operation (VSEL
Open the catalog to page 118.3.2. Output voltage range The power supply of TC7738WBG consists of DC-DC1 to DC-DC6, LDO1, and LDO2. DC-DC1 and LDO2 can set BYPASS MODE. DC-DC5 incorporates LOAD-SW for extension output. Table 8.5 Power supply configuration Note1: For output mode and default voltage setting, refer to Table 8.6. Note2: For output voltage setting by registers, refer to Table 8.9 to Table 8.24.
Open the catalog to page 128.3.3. Default output voltage setting Default voltage of each channel at startup can be set by VSEL0 and MODE_SEL pin input. Table 8.6 Default output voltage Note1: VSEL0 and MODE_SEL input should not change settings during operation. Note2: When MODE_SEL=Open, the setting should not be BYPASS MODE setting (FB1=GND).
Open the catalog to page 13Startup sequence TC7738WBG can change the timing by writing to eFuse when the power supply of each channel turns ON. Delay time can set maximum SLT6 (3 ms (typ.)) for each channel, assuming that the SLOT time 0.5 ms (typ.) is one step. The following shows the startup sequence of each power supply of “TC7738WBG-P00”. P00 means the setting code. (Example) TC7738WBG-P00 setting SLT0: CH5, CH6, LDO2 SLT1: CH2, CH3, CH4 SLT2: CH1, LDO1 VIN = 3.3 V, VSEL0 = H, MODE_SEL = L, FB1 = L Tss 3.3V IC startup Default output voltage according to VSEL0 Voltage output of register setting UVLO deacitive...
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