Datasheet LTC3445 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN |
| 页数 / 页 | 24 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 486 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LTC3445
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC1 = VCC2 = 3.6V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IS Additional Input DC Bias Current For Buck (Note 4) Active Mode VOUT = 90%, ILOAD = 0A 220 µA Sleep Mode VOUT = 103%, ILOAD = 0A 6 µA fOSC Nominal Oscillator Frequency VOUT = 100% ● 1.2 1.5 1.8 MHz VOUT = 0V 300 kHz RPFET RDS(ON) of P-Channel FET ISW = 100mA 0.45 Ω RNFET RDS(ON) of N-Channel FET ISW = –100mA 0.325 Ω ILSW SW Leakage VRUN = 0V, VSW = 0V or 5V, VCC1 = 5V 1 µA
LDO1
IS Additional DC Bias for LDO1 23 30 µA VOUT Regulated Output Voltage 2.5V < VIN < 5.5V, 1mA < ILOAD < 50mA 0.582 VCC2 – V 0.3 Line Regulation ∆VCC2 = 2.5V to 5.5V, ILOAD = 1mA, VOUT = 1.2V 1 5 mV Load Regulation VCC2 = 2.5V, ∆ILOAD = 1mA to 50mA, VOUT = 1.2V 15 mV Dropout Voltage ILOAD = 50mA 0.3 V VFB LDO Feedback Voltage ILOAD = 0mA ● 0.582 0.6 0.618 V
LDO2
IS Additional DC Bias for LDO2 23 30 µA VOUT Regulated Output Voltage 2.5V < VIN < 5.5V, 1mA < ILOAD < 50mA 0.582 VCC2 – V 0.3 Line Regulation ∆VCC2 = 2.5V to 5.5V, ILOAD = 1mA, VOUT = 1.2V 1 5 mV Load Regulation VCC2 = 2.5V, ∆ILOAD = 1mA to 50mA, VOUT = 1.2V 15 mV Dropout Voltage ILOAD = 50mA 0.3 V VFB LDO Feedback Voltage ILOAD = 0mA ● 0.582 0.6 0.618 V
PowerPath Controller
VTRACK Tracked Input Voltage 3 VCC1 – V 0.2 VTRACK – Tracked Output Voltage at VCC BATT 3V < VTRACK < VCC1 – 0.2V –0.2 0 0.2 V VCC BATT VBACKUP Backup Battery Voltage 2 5.5 V IBACKUP Backup Battery Bias Current VCC1 = VTRACK = 0V, VBACKUP = 2.5V 4 6.5 µA VCC BATT VCC BATT Output VTRACK = 0V, VCC1 = 4V, IVCCBAT = 8mA 2.85 3 3.1 V IVCCBATT Max VCC BATT Output Current VCC1 = 2.5V 8 mA BATTFAULT VCC1 High Level (Good) Where BATTFAULT Goes High 2.65 2.8 2.9 V VCC1 Low Level (Bad) Where BATTFAULT Goes Low 2.4 2.5 2.6 V Hysteresis VCC1 = 0V to 4.2V, 4.2 to 0V 0.3 V
I2C Interface
fI2C(MAX) Maximum I2C Operating Frequency (Note 5) 400 kHz tBUF Bus Free Time Between Stop and Start (Note 5) 1.3 µs Condition tHD(RSTA) Hold Time After (Repeated) (Note 5) 600 ns Start Condition 3445fa 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC1 = VCC2 = 3.6V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IS Additional Input DC Bias Current For Buck (Note 4) Active Mode VOUT = 90%, ILOAD = 0A 220 µA Sleep Mode VOUT = 103%, ILOAD = 0A 6 µA fOSC Nominal Oscillator Frequency VOUT = 100% ● 1.2 1.5 1.8 MHz VOUT = 0V 300 kHz RPFET RDS(ON) of P-Channel FET ISW = 100mA 0.45 Ω RNFET RDS(ON) of N-Channel FET ISW = –100mA 0.325 Ω ILSW SW Leakage VRUN = 0V, VSW = 0V or 5V, VCC1 = 5V 1 µA
LDO1
IS Additional DC Bias for LDO1 23 30 µA VOUT Regulated Output Voltage 2.5V < VIN < 5.5V, 1mA < ILOAD < 50mA 0.582 VCC2 – V 0.3 Line Regulation ∆VCC2 = 2.5V to 5.5V, ILOAD = 1mA, VOUT = 1.2V 1 5 mV Load Regulation VCC2 = 2.5V, ∆ILOAD = 1mA to 50mA, VOUT = 1.2V 15 mV Dropout Voltage ILOAD = 50mA 0.3 V VFB LDO Feedback Voltage ILOAD = 0mA ● 0.582 0.6 0.618 V
LDO2
IS Additional DC Bias for LDO2 23 30 µA VOUT Regulated Output Voltage 2.5V < VIN < 5.5V, 1mA < ILOAD < 50mA 0.582 VCC2 – V 0.3 Line Regulation ∆VCC2 = 2.5V to 5.5V, ILOAD = 1mA, VOUT = 1.2V 1 5 mV Load Regulation VCC2 = 2.5V, ∆ILOAD = 1mA to 50mA, VOUT = 1.2V 15 mV Dropout Voltage ILOAD = 50mA 0.3 V VFB LDO Feedback Voltage ILOAD = 0mA ● 0.582 0.6 0.618 V
PowerPath Controller
VTRACK Tracked Input Voltage 3 VCC1 – V 0.2 VTRACK – Tracked Output Voltage at VCC BATT 3V < VTRACK < VCC1 – 0.2V –0.2 0 0.2 V VCC BATT VBACKUP Backup Battery Voltage 2 5.5 V IBACKUP Backup Battery Bias Current VCC1 = VTRACK = 0V, VBACKUP = 2.5V 4 6.5 µA VCC BATT VCC BATT Output VTRACK = 0V, VCC1 = 4V, IVCCBAT = 8mA 2.85 3 3.1 V IVCCBATT Max VCC BATT Output Current VCC1 = 2.5V 8 mA BATTFAULT VCC1 High Level (Good) Where BATTFAULT Goes High 2.65 2.8 2.9 V VCC1 Low Level (Bad) Where BATTFAULT Goes Low 2.4 2.5 2.6 V Hysteresis VCC1 = 0V to 4.2V, 4.2 to 0V 0.3 V
I2C Interface
fI2C(MAX) Maximum I2C Operating Frequency (Note 5) 400 kHz tBUF Bus Free Time Between Stop and Start (Note 5) 1.3 µs Condition tHD(RSTA) Hold Time After (Repeated) (Note 5) 600 ns Start Condition 3445fa 3