7 + 1 Channel DC/DC PMU with Li-Ion Battery Charger for DSC
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 step-
up 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.
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
One WLED Driver in either Sync Step-Up or Current
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
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
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS5002C-00 January 2013
is a registered trademark of Richtek Technology Corporation.