RT9471
Single Cell Switching Battery ChargerThe RT9471 is a single cell switching battery charger from Richtek. View the full RT9471 datasheet below including key specifications, electrical characteristics.
Official RT9471 datasheet (PDF) — the source this page was extracted from.
RT9471 Key Specifications
| Parameter | Value |
|---|---|
| ESD (HBM) | 2kV |
| Charge Efficiency | 92% at 2A (5V input, 3.8V battery) |
| OTG Output Voltage | 5.15V (typical per efficiency spec) |
| Package Dimensions | 4mm x 4mm, 0.5mm pitch |
| Input Voltage Range | 3.9V to 13.5V |
| Switching Frequency | 1.5MHz |
| Charge Current (Max) | 3.15A |
| OTG Boost Efficiency | 92% at 1A (3.8V battery, 5.15V output) |
| Communication Interface | I2C |
| Maximum Battery Voltage | 4.7V |
| Storage Temperature Range | -65°C to 150°C |
| Thermal Resistance (θJA) | 28°C/W |
| Junction Temperature (Max) | 150°C |
| Maximum Input Current (IBUS) | 3.2A |
| VBUS/VAC Absolute Max Voltage | 22V |
RT9471 Overview
Part: RT9471DGQW — Richtek
Type: Single-Cell Switching Battery Charger with Power Path Management
Description: 3 A, 1.5 MHz synchronous switch-mode buck charger for single-cell Li-Ion/Li-polymer batteries, with a 3.9–13.5 V input range, I²C control, USB OTG boost output, and D+/D- USB port detection (RT9471D variant).
Operating Conditions:
- Input (VAC/VBUS) voltage: 3.9–13.5 V
- Ambient temperature: -40 to 85 °C
- Junction temperature: -40 to 150 °C
- Maximum battery voltage: 4.7 V
- Maximum input current IBUS: 3.2 A (2 A when VBUS ≥ 12 V)
Absolute Maximum Ratings:
- VAC / VBUS: -1.4 V to 22 V
- PMID: -0.3 V to 22 V
- SW: -0.3 V to 16 V
- BTST-SW, SYS, BAT, and other pins (STAT, SCL, SDA, INT, CE, TS, QON, REGN, D+, D-): -0.3 V to 6 V
- Junction temperature: 150 °C
- Storage temperature: -65 to 150 °C
- Lead temperature (soldering, 10 s): 260 °C
- ESD (HBM): 2 kV
Key Specs:
- VBUS operating range: 3.9–13.5 V
- Charge voltage range: 3.9–4.7 V in 10 mV steps, ±0.5% accuracy (default 4.2 V)
- Charge current range: 0–3150 mA in 50 mA steps (default 2000 mA)
- Pre-charge current range: 50–800 mA (default 150 mA)
- End-of-charge current range: 50–800 mA (default 200 mA)
- Average input current regulation (AICR): 0.05–3.2 A in 50 mA steps (default 0.5 A)
- MOSFET on-resistance (typ): Q1 38 mΩ, Q2 52 mΩ, Q3 54 mΩ, BAT-SYS 18 mΩ
- Battery discharge current, Q4 disabled (VBAT = 4.5 V, High-Z): 15 μA typ, 32 μA max
- Thermal shutdown: 160 °C typ
Features:
- 1.5 MHz synchronous switch-mode buck charger
- 92% charge efficiency at 2 A (5 V input, 3.8 V battery)
- USB OTG boost with 92% efficiency at 1 A (3.8 V battery, 5.15 V output)
- Input regulation: AICR, MIVR, MIVR Track
- Charge regulation: CCR, CVR, CVR Track
- Junction thermal regulation
- JEITA temperature profile support via TS pin
- Protections: OTP, VBUS OVP, VBAT OVP, VSYS OVP/UVP/OLP, cycle-by-cycle OCP, OTG low-battery protection
- I²C serial interface
- BC1.2 D+/D- detection (RT9471D)
Applications:
- Smart phone / tablet PC
- Personal information appliances
- Portable devices and accessories
Package:
- WQFN-24L 4x4
RT9471 Features
- High Efficiency, 1.5MHz, Synchronous SwitchMode Buck Charger
- 92% Charge Efficiency at 2A with 5V Input and 3.8V Battery
- Support 3.9V to 13.5V Input Voltage Range
- Average Input Current Regulation (AICR)
- Minimum Input Voltage Regulation (MIVR)
- Minimum Input Voltage Regulation Track (MIVR Track)
- Charge Current Regulation (CCR)
- Charge Voltage Regulation (CVR)
- Charge Voltage Regulation Track (CVR Track)
- Junction Thermal Regulation (JTR)
- Supports USB On-The-Go (OTG)
- 92% Boost Efficiency at 1A with 3.8V Battery and 5.15V Output
- OTG Current Limit Regulation (OCLR)
- OTG Voltage Limit Regulation (OVLR)
- Protection
- Over-Temperature Protection (OTP)
- VBUS Over-Voltage Protection (VBUS OVP)
- Battery Over-Voltage Protection (VBAT OVP)
- System Over-Voltage Protection (VSYS OVP)
- System Under-Voltage Protection (VSYS UVP)
- System Over-Load Protection (VSYS OLP)
- Cycle-by-Cycle Over-Current Protection (OCP)
- OTG Low Battery Protection (OTG LBP)
RT9471 Applications
- Smart Phone/Tablet PC
- Personal Information Appliances
- Portable Device and Accessory
RT9471 Pin Configuration
WQFN-24L 4x4 (RT9471)
RT9471 Electrical Characteristics
(VBUS_MIN_RISE < VAC < VAC_OVP_RISE and VAC > VBAT + VSLEEP_RISE, TA = 25 C, unless otherwise specified) (Note 5)
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Quiescent Current | Quiescent Current | Quiescent Current | Quiescent Current | Quiescent Current | Quiescent Current | Quiescent Current |
| Battery Discharge Current (BAT) in Q4 Disabled | I BAT_Q4_DIS | V BAT = 4.5V, High-Z mode and I 2 C disabled, Q4 disabled | -- | 15 | 32 | A |
| Battery Discharge Current (BAT) in Q4 Enable | I BAT_Q4_EN | V BAT = 4.5V, High-Z mode and I 2 C disabled, Q4 enabled | -- | 55 | 85 | A |
| Input Supply Current (VBUS) in Buck Mode | I BUS_HIZ | V BUS = 5V, High-Z mode and no battery | -- | 50 | 86 | A |
| Input Supply Current (VBUS) in Buck Mode | I BUS_HIZ | V BUS = 12V, High-Z mode and no battery | -- | 52 | 88 | A |
| Input Supply Current (VBUS) in Buck Mode | I BUS_BUCK | V BUS > V BUS_MIN_RISE , V BUS > V BAT , converter switching, V BAT = 3.8V, I SYS = 0A | -- | 5 | 7 | mA |
| Battery Discharge Current (BAT) in Boost Mode | I BAT_BOOST | V BAT = 4.2V, boost mode, I BUS = 0A, converter switching | -- | 4 | 5 | mA |
| VAC, VBUS and BAT Power | VAC, VBUS and BAT Power | VAC, VBUS and BAT Power | VAC, VBUS and BAT Power | VAC, VBUS and BAT Power | VAC, VBUS and BAT Power | VAC, VBUS and BAT Power |
| VBUS Operating Range | V BUS_OP | V BUS rising | 3.9 | -- | 13.5 | V |
| REGN Turn Off Level with Only VBUS | V BUS_UVLO | V BUS falling | 3.0 | 3.3 | 3.6 | V |
| Sleep Mode Falling Threshold | V SLEEP_FALL | V AC falling, V AC - V BAT | 10 | 60 | 120 | mV |
| Sleep Mode Rising Threshold | V SLEEP_RISE | V AC rising, V AC - V BAT | 160 | 250 | 340 | mV |
| VAC 5.8V Over-Voltage rising threshold | V AC_OVP_RISE | V AC rising | 5.5 | 5.8 | 6.1 | V |
| VAC 6.5V Over-Voltage rising threshold | V AC_OVP_RISE | V AC rising | 6.2 | 6.5 | 6.8 | V |
| VAC 10.9V Over-Voltage Rising Threshold | V AC_OVP_RISE | V AC rising | 10.3 | 10.9 | 11.5 | V |
| VAC 14V Over-Voltage Rising Threshold | V AC_OVP_RISE | V AC rising | 13.3 | 14 | 14.7 | V |
| VAC 5.8V Over-Voltage Hysteresis | V AC_OVP_HYS | V AC falling | -- | 300 | -- | mV |
| VAC 6.5V Over-Voltage Hysteresis | V AC_OVP_HYS | V AC falling | -- | 300 | -- | mV |
| VAC 10.9V Over-Voltage Hysteresis | V AC_OVP_HYS | V AC falling | -- | 300 | -- | mV |
| VAC 14V Over-Voltage Hysteresis | V AC_OVP_HYS | V AC falling | -- | 300 | -- | mV |
| BAT for Active I 2 C, No Adapter | V BAT_UVLO | V BAT rising | 2.0 | 2.2 | 2.4 | V |
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
| Battery Depletion Falling Threshold | V BAT_DPL_FALL | V BAT falling | 2.15 | 2.38 | 2.65 | V |
| Battery Depletion Rising Threshold | V BAT_DPL_RISE | V BAT rising | 2.4 | 2.6 | 2.8 | V |
| Battery Depletion Rising Hysteresis | V BAT_DPL_HYS | V BAT rising | -- | 220 | -- | mV |
| Bad Adapter Detection Rising Threshold | V BUS_MIN_RISE | V BUS rising | 3.6 | 3.8 | 4 | V |
| Bad Adapter Detection Hysteresis | V BUS_MIN_HYS | V BUS falling | -- | 200 | -- | mV |
| Bad Adapter Detection Current Source | I BADSRC | Sink current from V BUS to GND | -- | 40 | -- | mA |
| Power Path | ||||||
| System Regulation Voltage | V SYS_MIN | V BAT < V SYS_MIN = 3.5V, Q4 disabled/enable | 3.5 | 3.5 + 0.2 | -- | V |
| System Regulation Voltage | V SYS | I SYS = 0A, V BAT > V SYS_MIN = 3.5V, Q4 disabled | -- | V BAT + 0.05 | -- | V |
| Top Reverse Blocking MOSFET On-Resistance Between VBUS and PMID | R ON(Q1) | 40°C ≤ T A ≤ 125°C | -- | 38 | -- | m |
| Top Switching MOSFET On- Resistance Between PMID and SW | R ON(Q2) | V REGN = 5V, 40°C ≤ T A ≤ 125°C | -- | 52 | -- | m |
| Bottom Switching MOSFET On-Resistance Between SW and GND | R ON(Q3) | V REGN = 5V, 40°C ≤ T A ≤ 125°C | -- | 54 | -- | m |
| SYS-BAT MOSFET On- Resistance | R ON(BAT-SYS) | Measured from BAT to SYS, V BAT = 4.2V, T J = 25°C | -- | 18 | -- | m |
| Battery Charger | ||||||
| Charge Voltage Range | V BAT_REG_RANGE | Default = 4.2V | 3.9 | -- | 4.7 | V |
| Charge Voltage Step | V BAT_REG_STEP | -- | 10 | -- | mV | |
| Charge Voltage Setting Accuracy | V BAT_REG_ACC | -0.5 | -- | 0.5 | % | |
| Charge Current Regulation Range | I CHG_REG_RANGE | Default = 2000mA | 0 | -- | 3150 | mA |
| Charge Current Regulation Step | I CHG_REG_STEP | -- | 50 | -- | mA | |
| Charge Current Regulation Accuracy | I CHG_REG_ACC | VBAT=3.8V, I CHG_REG < 150mA | -20 | -- | 20 | % |
| Charge Current Regulation Accuracy | I CHG_REG_ACC | VBAT=3.8V, 150mA ≤ I CHG_REG < 750mA | -10 | -- | 10 | % |
| Charge Current Regulation Accuracy | I CHG_REG_ACC | VBAT=3.8V, I CHG_REG ≥ 750mA | -5 | -- | 5 | % |
| Pre-Charge Falling Threshold | V PRE_CHG_FALL | I CHG = 200mA, V PRE_CHG = 3.1V | 2.75 | 2.9 | 3.05 | V |
| Pre-Charge Rising Threshold | V PRE_CHG_RISE | Pre-charge to fast charge, V PRE_CHG = 3.1V | 2.95 | 3.1 | 3.25 | V |
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
| Pre-Charge Current Range | I PRE_CHG_RANGE | Default = 150mA | 50 | -- | 800 | mA |
| Pre-Charge Current Step | I PRE_CHG_STEP | -- | 50 | -- | mA | |
| Pre-Charge Accuracy | I PRE_CHG_ACC | V BUS = 5V, I PRE_CHG = 150mA | 15 | -- | 25 | % |
| End-Of-Charge Current Range | I EOC_CHG_RANGE | Default = 200mA | 50 | -- | 800 | mA |
| End-Of-Charge Current Step | I EOC_CHG_STEP | -- | 50 | -- | mA | |
| End-Of-Charge Accuracy | I EOC_CHG_ACC | I CHG_REG > 700mA, I EOC_CHG = 200mA, VBAT = 4.2V | 20 | -- | 20 | % |
| I EOC_CHG_ACC | I CHG_REG ≤ 700mA, I EOC_CHG = 200mA, VBAT = 4.2V | 10 | -- | 10 | % | |
| I EOC_CHG_ACC | I CHG_REG = 600mA, I EOC_CHG = 50mA, VBAT = 4.2V | 25 | -- | 25 | % | |
| Trickle-Charge Falling Threshold | V TRICKLE_CHG_ FALL | V BAT falling | 1.8 | 2 | 2.2 | V |
| Trickle-Charge Rising Threshold | V TRICKLE_CHG_ RISE | V BAT rising | 2.05 | 2.25 | 2.45 | V |
| Trickle-Charge Current | I TRICKLE_CHG | V BAT < V TRICKLE_CHG_RISE | 80 | 100 | 120 | mA |
| Re-Charge Threshold Below VBAT_REG | V RE_CHG | V BAT falling, V RECHG = 100mV | 70 | 100 | 130 | mV |
| V BAT falling, V RECHG = 200mV | 170 | 200 | 230 | |||
| System Discharge Load Current | I SYS_LOAD | V SYS = 4.2V | -- | 30 | -- | mA |
| Input Voltage and Current Regulation | Input Voltage and Current Regulation | Input Voltage and Current Regulation | Input Voltage and Current Regulation | Input Voltage and Current Regulation | Input Voltage and Current Regulation | Input Voltage and Current Regulation |
| Minimum Input Voltage Regulation Range | V MIVR_RANGE | Default = 4.5V | 3.9 | -- | 5.4 | V |
| Minimum Input Voltage Regulation Step | V MIVR_STEP | -- | 100 | -- | mV | |
| Minimum Input Voltage Regulation Accuracy | V MIVR_ACC | V MIVR = 3.9V and 4.4V | 1.5 | -- | 1.5 | % |
| MIVR Tracking VBAT | V MIVR_BAT_TRACK | V MIVR = 3.9V, V MIVR_BAT_TRACK = 300mV, V BAT = 4V | -- | 4.3 | -- | V |
| MIVR Tracking VBAT Accuracy | V MIVR_BAT_TRACK _ACC | 3 | -- | 3 | % | |
| Average Input Current Regulation Range | I AICR_RANGE | Default = 0.5A | 0.05 | -- | 3.2 | A |
| Average Input Current Regulation Step | I AICR_STEP | -- | 50 | -- | mA | |
| Average Input Current Regulation Accuracy | I AICR_ACC | V BUS = 5V, I AICR = 500mA | 450 | 470 | 500 | |
| I AICR_ACC | V BUS = 5V, I AICR = 900mA | 780 | 840 | 900 | mA | |
| I AICR_ACC | V BUS = 5V, I AICR = 1500mA | 1300 | 1400 | 1500 | ||
| I AICR_ACC | V BUS = 5V, I AICR > 1500mA | 15 | -- | 0 | % | |
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
| BAT Over-Voltage Protection | BAT Over-Voltage Protection | BAT Over-Voltage Protection | BAT Over-Voltage Protection | BAT Over-Voltage Protection | BAT Over-Voltage Protection | BAT Over-Voltage Protection |
| Battery Over-Voltage Rising | V BAT_OVP_RISE | V BAT rising, as percentage of V BAT_REG | 103 | 104 | 105 | % |
| Battery Over-Voltage Falling | V BAT_OVP_FALL | V BAT falling, as percentage of V BAT_REG | 101 | 102 | 103 | % |
| Input Reverse Blocking NFET and Regulation | Input Reverse Blocking NFET and Regulation | Input Reverse Blocking NFET and Regulation | Input Reverse Blocking NFET and Regulation | Input Reverse Blocking NFET and Regulation | Input Reverse Blocking NFET and Regulation | Input Reverse Blocking NFET and Regulation |
| Junction Thermal Regulation Range | T J_THREG_RANGE | Default = 120°C | 100 | -- | 120 | °C |
| Junction Thermal Regulation Step | T J_THREG_STEP | -- | 20 | -- | °C | |
| Thermal Shutdown Rising | T OTP | Temperature rising | -- | 160 | -- | °C |
| Thermal Shutdown Hysteresis | T OTP_HYS | Temperature falling | -- | 30 | -- | °C |
| NTC Monitor (Charger Mode) | NTC Monitor (Charger Mode) | NTC Monitor (Charger Mode) | NTC Monitor (Charger Mode) | NTC Monitor (Charger Mode) | NTC Monitor (Charger Mode) | NTC Monitor (Charger Mode) |
| Battery Temperature COLD Threshold (0°C) | V VTS_COLD | V TS rising, the ratio of V REGN | 72.5 | 73.5 | 74.5 | % |
| Battery Temperature COOL Threshold (10°C) | V VTS_COOL | V TS rising, the ratio of V REGN | 67.5 | 68.5 | 69.5 | % |
| Battery Temperature WARM Threshold (45°C) | V VTS_WARM | V TS falling, the ratio of V REGN | 44 | 45 | 46 | % |
| Battery Temperature HOT Threshold (60°C) | V VTS_HOT | V TS falling, the ratio of V REGN | 33.5 | 34.5 | 35.5 | % |
| Battery Temperature Hysteresis | V VTS_HYS | -- | 1.5 | -- | % | |
| NTC Monitor (OTG Mode) | NTC Monitor (OTG Mode) | NTC Monitor (OTG Mode) | NTC Monitor (OTG Mode) | NTC Monitor (OTG Mode) | NTC Monitor (OTG Mode) | NTC Monitor (OTG Mode) |
| Battery Temperature COLD Threshold OTG mode ( 20°C) | V VTS_COLD_OTG | V TS rising, the ratio of V REGN | 79 | 80 | 81 | % |
| Battery Temperature HOT Threshold OTG mode (60°C) | V VTS_HOT_OTG | V TS falling, the ratio of V REGN | 33.5 | 34.5 | 35.5 | % |
| Battery Temperature Hysteresis OTG mode | V VTS_HYS_OTG | -- | 1.5 | -- | % | |
| Charger Over-Current Threshold | Charger Over-Current Threshold | Charger Over-Current Threshold | Charger Over-Current Threshold | Charger Over-Current Threshold | Charger Over-Current Threshold | Charger Over-Current Threshold |
| UGFET Cycle-by-Cycle Over-Current Threshold | I OCP_UG | 5.5 | 6.5 | 7.5 | A | |
| System Over-Load Threshold | I OCP_BATFET | 6 | -- | -- | A | |
| USB On-The-Go (OTG) | USB On-The-Go (OTG) | USB On-The-Go (OTG) | USB On-The-Go (OTG) | USB On-The-Go (OTG) | USB On-The-Go (OTG) | USB On-The-Go (OTG) |
| OTG Low Battery Protection | V OTG_LBP | V BAT falling, V OTG_LBP = 2.8V | 2.65 | 2.8 | 2.95 | V |
| V OTG_LBP | V BAT rising, V OTG_LBP = 2.8V | 2.75 | 2.9 | 3.05 | V | |
| V OTG_LBP | V BAT falling, V OTG_LBP = 2.5V | 2.35 | 2.5 | 2.65 | V | |
| V OTG_LBP | V BAT rising, V OTG_LBP = 2.5V | 2.45 | 2.6 | 2.75 | V | |
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
| OTG Voltage Limit Regulation Range | V OTG_CV_RANGE | Default = 5.15V | 4.85 | -- | 5.3 | V |
| OTG Voltage Limit Regulation Step | V OTG_CV_STEP | -- | 150 | -- | mV | |
| OTG Voltage Limit Regulation Accuracy | V OTG_CV_ACC | V BAT = 3.8V, I PMID = 0A, V OTG_REG = 5.15V | 3 | -- | 3 | % |
| OTG Current Limit | I OTG_CC | I OTG_LIMIT_REG_SEL = 1.2A | 1.2 | 1.4 | 1.6 | A |
| Regulation Accuracy | I OTG_CC | I OTG_LIMIT_REG_SEL = 0.5A | 0.5 | 0.6 | 0.7 | A |
| OTG Over-Voltage Threshold | V OTG_OVP | V AC rising, V AC_OVP = 6.5V | 6.2 | 6.5 | 6.8 | V |
| PWM | ||||||
| PWMSwitching Frequency | f SW_BUCK | Oscillator frequency, buck mode | 1350 | 1500 | 1650 | kHz |
| f SW_BOOST | Oscillator frequency, boost mode | 1350 | 1500 | 1650 | kHz | |
| Maximum PWMDuty Cycle | D MAX | -- | 97 | -- | % | |
| REGN | ||||||
| REGN LDO Output | VREGN | V BUS = 9V, I REGN = 40mA | 4.5 | 4.9 | 5.3 | V |
| Voltage | VREGN | V BUS = 5V, I REGN = 20mA | 4.5 | 4.9 | 5 | V |
| Control I/O Pin (CE, PSEL, SCL and SDA) | Control I/O Pin (CE, PSEL, SCL and SDA) | |||||
| Input High Threshold Voltage | V IH_CTRL | 1.3 | -- | -- | V | |
| Input Low Threshold Voltage | V IL_CTRL | -- | -- | 0.4 | V | |
| High Level Leakage Current | I BIAS | Pull high to 1.8V | -- | -- | 1 | A |
| Control I/O Pin (PG, STAT and INT) | Control I/O Pin (PG, STAT and INT) | |||||
| Output Low Threshold Voltage | V OL_CTRL | -- | -- | 0.4 | V | |
| INT Pull Low Time | t INT_PULL_LOW | INT pull low time | -- | 256 | -- | s |
| D+/D- Detection | D+/D- Detection | |||||
| Data Detect Voltage | V DAT_REF | 0.25 | 0.325 | 0.4 | V | |
| D- Current Sink | I D-_ISNK | 50 | 100 | 150 | A | |
| D+D- Leakage Current | I D+D-_LKG | 1 | -- | 1 | A | |
| D- Pulldown for Connection Check | R D-_19K | 14.25 | 19.53 | 24.8 | k | |
| D+D- Threshold for Non- Standard Adapter (1.2V) | V D+D-_1P2 | -- | 1.2 | -- | V | |
| D+D- Threshold for Non- Standard Adapter (2.0V) | V D+D-_2P0 | -- | 2 | -- | V | |
| D+D- Threshold for Non- Standard Adapter (2.8V) | V D+D-_2P8 | -- | 2.8 | -- | V | |
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
| Timing Requirements | Timing Requirements | Timing Requirements | Timing Requirements | Timing Requirements | Timing Requirements | Timing Requirements |
| VAC OVP Reaction Time | t VAC_OVP | -- | 200 | -- | ns | |
| Bad Adapter Detection Duration | t BAD_AD_ DETECTION | -- | 30 | -- | ms | |
| Deglitch Time for Charger EOC | t EOC_DGL | -- | 256 | -- | ms | |
| Deglitch Time for Re- Charge | t RE_CHG_DGL | -- | 256 | -- | ms | |
| Charge Safe Timer | t CHG_SAFE_TMR | Timer = 10hr | 9 | 10 | 11 | hr |
| Back-Ground Charge Timer | t BG_CHG_TMR | Timer = 30min | 29 | 30 | 31 | min |
| QONTiming | QONTiming | QONTiming | QONTiming | QONTiming | QONTiming | QONTiming |
| QON Low Time to Exit Shipping Mode | t SHIPMODE_EXIT | 0.9 | 1.1 | 1.3 | s | |
| QON Low Time to Reset System | t QON_RST | 9 | 10 | 11 | s | |
| BATFET Reset Time | t BATFET_RST | 430 | 453 | 480 | ms | |
| Enter Shipping Mode Delay Time | t SHIP_MODE_ ENTER | 11 | 12 | 13 | s | |
| I 2 C Clock and Watchdog Timer | I 2 C Clock and Watchdog Timer | I 2 C Clock and Watchdog Timer | I 2 C Clock and Watchdog Timer | I 2 C Clock and Watchdog Timer | I 2 C Clock and Watchdog Timer | I 2 C Clock and Watchdog Timer |
| SCL Clock | f SCL | CB ≤ 100pF | -- | -- | 3.4 | MHz |
| SCL Clock | f SCL | 100pF < CB ≤ 400pF | -- | -- | 1.7 | MHz |
| Watchdog Timer | t WDT | Default = 40s | -- | 40 | -- | s |
| Watchdog Reset Wait Time | t WDT_WAIT | -- | 500 | -- | ms |
- Note 1. Stresses beyond those listed under 'Absolute Maximum Ratings' may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability.
- Note 2. JA is measured under natural convection (still air) at TA = 25°C with the component mounted on a high effective-thermalconductivity four-layer test board on a JEDEC 51-7 thermal measurement standard. JC is measured at the top of the package.
- Note 3. Devices are ESD sensitive. Handling precaution is recommended.
- Note 4. The device is not guaranteed to function outside its operating conditions.
- Note 5. Specification is guaranteed by design and/or correlation with statistical process control.
RT9471 Thermal Information
To start a boost mode to discharge from battery, the voltage on TS pin must be in T0 to T4 range. The device will stop converter if the battery temperature is lower than T0 (COLD_OTG) or higher than T4 (HOT_OTG). In this case, the IC_STAT = 1000 for charge fault and an INT is asserted to the host.
Once temperature returns to normal range, the boost mode is recovered.
Figure 7. Thermal Protect During Boost Mode
RT9471 Typical Application
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
| Part Number | Manufacturer | Package |
|---|---|---|
| RT9471/D | Richtek | WQFN-24 4x4mm |
| RT9471D | Richtek | — |
| RT9471DGQW | Richtek | WQFN-24-EP(4x4) |
| RT9471GQW | Richtek | WQFN-24 4x4mm |
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