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PDF RT5021 Data sheet ( Hoja de datos )
| Número de pieza | RT5021 | |
| Descripción | 6 + 3 Channels DC/DC PMU | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT5021
6 + 3 Channels DC/DC PMU with Li-ion Battery Charger
for CMOS DSC/DV
General Description
The RT5021 is a complete power supply solution for digital
still cameras and other hand held devices. The RT5021 is
composed of a multi-channel DC/DC power converter unit,
a single-cell linear Li-ion battery charger, a charger type
detector, and an I2C control interface.
The power converter unit includes one synchronous step-
up converter (CH1), one synchronous step-up/down
converter (CH2), three synchronous step-down converters
(CH3/4/5), two LDOs with input power as low as 1.5V
(CH6/8), one WLED driver in synchronous high-voltage
step-up mode or low-voltage current regulator mode (CH7),
and a keep-alive LDO (CH9) 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, and under voltage
protection. RT5021 has a WAKEUP impulse generation
circuitry to monitor VIN or BAT installation event. To fulfill
most of applications, RT5021 has six preset power on/off
sequences.
The battery charger includes Auto Power Path
Management (APPM). No external MOSFETs are required.
The charger can enter 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 via the I2C control
interface. The battery regulation voltage and current can
be adjusted by JEITA standard temperature control or other
schemes set via the I2C interface. 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. The charger includes USB charger detection
circuitry via D+ and D- pins of USB interface to detect
USB standard downstream ports (SDP), USB charging
downstream port (CDP), dedicated charger port (DCP),
or Apple/Sony charger ports. RT5021 uses some
indicators to show charger states : two open drain ports
CHG and CHG2, and an interrupt (INT) to immediately notify
the state change.
RT5021 has I2C interface to control rich functions of Power
Converter Unit and Charger Unit. The RT5021 is available
in the WQFN-40L 5x5 package.
Simplified Application Circuit
Adapter/USB
System Power
I2C Control
VIN
SYS
SCL
SDA
GND
RT5021
BAT
PVD1
VO2
LX3
LX4
LX5
VO6
PVD7
VO8
VRTC
Charger for Battery
Step-Up for Motor
Step-Up/Down for I/O
Step-Down for Core
Step-Down for Memory
Step-Down
LDO
Step-Up for LED Backlight
LDO
LDO for RTC
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS5021-01 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT5021
Pin No.
Pin Name
Pin Function
28 FB3 Feedback Input Pin of CH3.
Temperature Sense Input. The TS pin connects to a battery’s thermistor to
29
TS
determine if the battery is too hot or too cold to charge. If the battery’s
temperature is out of range, charging is paused until it re-enters the valid range.
TS also detects whether the battery (with NTC) is present or not.
30 VP Power Output Pin of 3.3V Buffer for Battery Temperature Sensing.
31 LX3 Switch Node of CH3.
32
PVD3
Power Input Pin of CH3.
33, 34 BAT Charger Output for Battery.
35, 36
SYS
Power Output for System. Connect this pin to System with a minimum 10μF
ceramic capacitor to GND.
37 VIN Supply Voltage Input.
38 DP USB D+ Input for Charger Type Detection.
39 DN USB D- Input for Charger Type Detection.
40
VRTC
RTC LDO Power Output Pin.
41 (Exposed pad) GND
Exposed PAD Should be Soldered to PCB and Connected to GND.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS5021-01 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT5021
Parameter
Symbol
Test Conditions
CH5 LV Sync Step-Down
Output Voltage Accuracy at
VO5
Target voltage defined at A6.VOUT5
[3:0] = 4’b1000 to 4’b1111
Target voltage defined at A6.VOUT5
[3:0] = 4’b0001 to 4’b0111
Feedback Regulation Voltage
at FB5
A6.VOUT5 [3:0 ] = 4’b0000
Maximum Duty Cycle
Soft-Start Time
VO5 = 0V to Target
On Resistance of MOSFET
RDS(ON)_P P-MOSFET, PVD5 = 3.3V
RDS(ON)_N N-MOSFET, PVD5 = 3.3V
Current Limitation
IL IM_5
Under Voltage Protection at
VO5
Target voltage is the chosen one in
A6.VOUT5 [3:0] = 0000 (FB5 = 0.8)
Over Load Protection at VO5
Target voltage is the chosen one in
A6.VOUT5 [3:0] = 0001 to 0111
Target voltage is the chosen one in
A6.VOUT5 [3:0] = 0111 to 1111
Off Discharge Current at VO5
VO5 = 1.8V, SYS = 3.3V
Discharge Finishing Threshold
at VO5
CH6 LDO
Input Voltage Range (PVD6)
Quiescent Current into PVD6
Regulation Voltage Accuracy
at VO6
PVD6 = 3.3V, IOUT = 0mA
A6.VOUT6 [3:0] = 4’b1000 to
4’b1111
A6.VOUT6 [3:0] = 4’b0000 to
4’b0111
Drop Out Voltage
(PVD6-VO6)
IOUT = 300mA, VO6 = 1.3V
PSRR+
Max Output Current
(Current Limit)
IOUT = 10mA, PVD6 = 3.3V at 1kHz
PVD6 = 1.5V, VO6 = 1.3V
Off Discharge Current at VO6
SYS = 3.3V
CH7 WLED Driver
Feedback Regulation Voltage
at FB7
(Both Step-Up and Current)
A2.EN7_DIM7 [4:0] = 5’b11111
Minimum On Time for PSM
(Step-Up)
Maximum Duty Cycle
(Step-Up mode)
FB7 = 0.15V
Min Typ
−1.5 --
−2 --
0.788 0.8
-- --
-- 4
-- 400
-- 250
1 1.5
--
Target
x 0.5
--
Target
− 0.1
Target
-- − 0.167
--
Target
− 0.25
-- 30
-- 0.1
1.5 --
-- --
−1.5 --
-2 --
-- --
-- −60
300 450
-- --
0.237 0.25
-- 300
91 93
Max
1.5
2
0.812
100
--
550
400
2
--
--
--
--
--
--
5.5
75
1.5
2
0.15
--
600
10
0.263
--
97
Unit
%
%
V
%
ms
mΩ
mΩ
A
V
mA
V
V
μA
%
%
V
dB
mA
mA
V
ns
%
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS5021-01 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT5021.PDF ] | |
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