RT9759

Smart Cap Divider Charger

The RT9759 is a high efficiency and high charge current charger. The efficiency is up to 97.8% when VBAT = 4.2V, IBAT = 2.5A and the maximum charge current is up to 8A. The device integrates smart cap divider topology, external over-voltage protection control, an input reverse blocking NFET and 2-way regulation, a dual-phase charge pump core, 15-way protection, 7-way system alarm and 9-Channel high speed analog-to-digital converter. The high speed analog-to-digital converter provides input and output voltage, current and temperature information for the host. The host can monitor the information by I²C serial interface.

Applications

Smart Phones
Tablet
PC

Key Spec.
	RT9759
Status	Active
Vin (min) (V)	2.8
Vin (max) (V)	17
Battery Charge Voltage (max) (V)	5
Battery Charge Current (max) (A)	8
Status Indicator	Yes
Charger Type	Switching
Input Source	USB
Features	Adjustable Frequency;I2C;OCP;OVP;SCP;Stable with Ceramic Capacitor;UVP
Package Type	WL-CSP3.35x3.35-56(BSC)
Built-in Power MOSFETs	Yes

Features

External OVP Control and Regulation
► High Absolute Maximum Rating of 40V
► Fast Reaction Time 100ns and Fast Turn Off Time 100ns
► VBAT Voltage Regulation (VBAT REG)
► IBAT Current Regulation (IBAT REG)
Input Reverse Blocking NFET
► Block the Reverse Current
Dual-Phase Charge Pump Core
► 8A Output Current Capability
► Efficiency Up to 97.8% when VBAT = 4.2V, IBAT = 2.5A
► 250kHz to 750kHz Variable Switching Frequency Stay Out of Audio Band
► Spread Spectrum Technology for EMI Reduction
4-Error Charge Pump Switch Protection
► VBUS Voltage Too High Error Protection before Switch (VBUS_HIGH_ERR)
► VBUS Voltage Too Low Error Protection before Switch (VBUS_LOW_ERR)
► CFLY Short Error Protection Before Switch (CFLY_DIAG)
► NFET Over-Current Error Protection During Switch (CON_OCP)
10-Way System Protection
► VBUS Over-Voltage Protection (VBUS_OVP)
► IBUS Over-Current Protection (IBUS_OCP)
► IBUS Under-Current Protection (IBUS_UCP)
► VOUT Over-Voltage Protection (VOUT_OVP)
► VBAT Over-Voltage Protection (VBAT_OVP)
► IBAT Over-Current Protection (IBAT_OCP)
► Dropout Over-Voltage Protection (VDR_OVP)
► TSBUS Over-Temperature Protection (TBUS_OTP)
► TSBAT Over-Temperature Protection (TBAT_OTP)
► Junction Over-Temperature Protection (TDIE_OTP)
7-Way System Alarm
► VBUS Over-Voltage Alarm (VBUS_OVP_ALM)
► IBUS Over-Current Alarm (IBUS_OCP_ALM)
► VBAT Over-Voltage Alarm (VBAT_OVP_ALM)
► IBAT Over-Current Alarm (IBAT_OCP_ALM)
► IBAT Under-Current Alarm (IBAT_UCP-ALM)
► TSBUS and TSBAT Over-Temperature Alarm (TBUS_TSBAT_OTP_ALM)
► TDIE Over-Temperature Alarm (TDIE_OTP_ALM)
9-Channel 12-bit ADC
► High Speed Data Rate for 128 Times Average Per Channel
► VBUS, IBUS, VOUT, VBAT, IBAT, TSBUS, TSBAT, TDIE, VAC 9-Channel for Voltage/Current Measurement

Datasheet
Title	Version	Last Update	Download
RT9759: Smart Cap Divider Charger	V2.0	2019/06/25

Technical Documents
Title	Item Type	Last Update	Download
Richtek Product Selection Guide [Jan., 2024]	Selection Guide	2024/01/18
Power Management for Video Doorbell	App. Note	2021/10/08

Videos
Title	Last Update	Views
Introducing the Versatile Buck-Boost Controller for USB PD Fast Charging Solutions	2023/09/11	287
How does mobile phone fast charging work?	2020/04/28	1421

Part Number	Package Type	Package Qty.	Free Sample	Distributor	Stock	Buy From Authorized Distributor
RT9759WSC	WL-CSP3.35x3.35-56(BSC)	1,500	Request	Digikey	1,445	Buy
				Mouser	Lead-Time: 14 weeks	Not Available
				WPG	Lead-Time: 14 weeks	Not Available

Please confirm with our distributor or sales representative for actual stock status.