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RT5002C
7 + 1 Channel DC/DC PMU with Li-Ion Battery Charger for DSC
General Description
The RT5002C is a complete power supply solution for digital still cameras and other handheld devices. It includes a 7+1 channel DC/DC power converter unit, a single-cell Li-ion battery charger, and an I2C control interface.
The power converter unit includes one synchronous stepup converter and three synchronous step-down converters for DSP core, I/O, Motor, and memory power supply, one synchronous high voltage step-up converter and one asynchronous inverting converter for CCD± bias, one WLED driver in either synchronous high voltage step-up or current source operation, and one low quiescent LDO for RTC application. All converters are internally frequency compensated and integrate power MOSFETs. The power converter unit provides complete protection functions: over current, thermal shutdown, over voltage, over-load, and under voltage protection.
The battery charger includes Auto Power Path Management (APPM). No external MOSFETs are required. The charger enters sleep mode when power is removed. Charging tasks are optimized by using a control algorithm to vary the charge rate, including pre-charge mode, fast charge mode and constant voltage mode. The charge current can also be programmed with an external resistor and modified via the I2C control interface. The scope that the battery regulation voltage can be modified via the I2C
interface depends on the battery temperature. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The charging task will always be terminated in constant voltage mode when the charging current reduces to the termination current of 10% x ICHG_FAST. The charger includes under voltage and over-voltage protection for the supply input voltage, VIN.
Features
Power Converter Unit : One Channel LV Sync Step-Up and Three Channel LV Sync Step-Down Up to 95% Efficiency One Sync Step-Up and One Async Inverting for CCD± bias One WLED Driver in either Sync Step-Up or Current Source Operation WLED Driver with Dimming Control Step-Up Mode with LED Open Protection (OVP7) One Low Quiescent LDO with Reverse Leakage Prevention for RTC Power Supply Preset On/Off Sequence of CH1, CH2, CH3, CH4 (1 → 3 → 4 → 2) Three Preset On/Off Sequences of CH5, CH6 (5 → 6, 6 → 5, and 5/6 at the same time)
Simplified Application Circuit
Input Power Chip Enable
I2C Control
VIN SYS RT5002C
PVD1
LX2
EN1234
LX3 LX4
PVD5
SCL SDA
VOUT6 PVD7
RTCPWR
GND BAT
System Power
Step-Up For Motor Step-Up/Down for I/O Step-Down for DDR II Step-Down for Core HV Step-Up for CCD HV Inverting for CCD Step-Up for LED Backlight LDO for RTC
Battery
Copyright ©2013 Richtek Technology Corporation. All rights reserved. DS5002C-00 January 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com 1
RT5002C
All Power Switches Integrated with Internal Compensation All Step-Up Converters with Load Disconnect Wake Up Impulse to Monitor BAT and VIN Plug-In Charger Unit : 28V Maximum Rating for VIN Power Selectable Power Current Limit (0.1A / 0.5A / 1.5A) Auto Power Path Management (APPM) and Integrated Power MOSFETs Battery Charging Current Control Battery Regulation Voltage Control Programmable Charging Current and Safe Charge Timer Under Voltage and Over Voltage Protection Charge Status Indicator Optimized Charge Rate via Thermal Feedback Interrupt Indicator to Fault/Status Events I2C Control Interface : Support Fast Mode up to 400kb/s Small 40-Lead WQFN Package RoHS Compliant and Halogen Free
Ordering Information
RT5002C
Package Type QW : WQFN-40L 5x5 (W-Type) Lead Plating System Z : ECO (Ecological Element with
Halogen Free and Pb free)
Note : Richtek products are :
RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
RT5002C ZQW YMDNN
RT5002CZQW : Product Number YMDNN : Date Code
Applications
DSC
Pin Configurations
(TOP VIEW)
LX1 PVD1 RTCPWR VIN SYS SYS BAT BAT PVD2 LX2
40 39 38 37 36 35 34 33 32 31
INT 1
30
FB1 2
29
VDDM 3
28
FB7 4
27
PVD7 5 LX7 6
GND
26 25
CHG 7
24
LX4 8 PVD4 9
23 41
22
FB4 10
21
11 12 13 14 15 16 17 18 19 20
WAKE FB2 TSSEL LX5 PVD5 FB5 EN1234 LX3 PVD3 FB3
ISETA TS VP
SDA SCL PVD6 LX6 VOUT6 FB6 VREF
WQFN-40L 5x5
Copyright ©2013 Richtek Technology Corporation. All rights reserved. www.richtek.com 2
is a registered trademark of Richtek Technology Corporation.
DS5002C-00 January 2013
RT5002C
Functional Pin Description
Pin No. 1
Pin Name INT
Pin Function
Interrupt Indicator Open Drain Output. If any toggle events of TS_FAULT, PGOOD, EOC, NoBAT, or SAFE happen, the output INT goes low. After I2C register bank address 0x2 is read or power on reset, INT goes high.
2 FB1 Feedback Input of CH1.
3
VDDM
IC Analog Power Pin.
4
FB7
Feedback Input of CH7 in Step-Up Mode or Current Sink Pin of CH7.