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PDF RT9986A Data sheet ( Hoja de datos )
| Número de pieza | RT9986A | |
| Descripción | 7-CH DC/DC Converter | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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RT9986A
7-CH DC/DC Converter for DSC
General Description
The RT9986A is a complete power supply solution for
digital still cameras and other handheld devices. It includes
one synchronous step-up DC/DC converter with load
disconnect, one selectable synchronous step-up/step-
down DC/DC converter, two synchronous step-down DC/
DC converters, one synchronous high voltage step-up DC/
DC converter, one inverting DC/DC converter, and one
selectable synchronous high voltage step-up/current-
source for WLED. In addition, the RT9986A also includes
one RTC_LDO, one voltage detector, and one System
Reset. All power MOSFETs are integrated in the RT9986A.
The RT9986A is designed to fulfill the applications for DSC
as follows :
CH1 is a synchronous step-up output for motor or DSC
system I/O power
CH2 is a selectable synchronous step-up/step-down
output for motor or DSC system I/O power
CH3 and CH4 are synchronous step-down outputs for DSP
core and memory power supply
CH5 is a synchronous high voltage step-up output for CCD
bias power supply
CH6 is an inverting output for negative CCD bias power
supply
CH7 is a selectable synchronous high voltage step-up/
current source for driving WLED
The selectable step-up/step-down converter can be auto
selected by external component topology. For the
RT9986A, all 7-CHs have built in internal compensation.
The RT9986A also provides a transformerless inverting
converter for supplying CCD power. For the low voltage
synchronous step-up and step down converters, efficiency
can be up to 95%.
The RT9986A provides comprehensive protection features
including over current protection, thermal shutdown
protection, over voltage protection, overload protection,
and under voltage protection.
Features
z CH2 Step-Up/Step-Down Auto-Selected by External
Topology
z Preset On/Off Sequence of CH1, CH2, CH3, CH4
(1 → 3 → 4 → 2)
z Preset On/Off Sequence of CH5, CH6 (5 → 6)
z All Channels with Internal Compensation
z All Power Switches Integrated
z All Step-Up Converter with Load Disconnect
z Step-Down DC/DC Converter
` Up to 95% Efficiency
` 100% (max) Duty Cycle
z Low Voltage Step-Up DC/DC Converter
` Adjustable Output Voltage
` Up to 95% Efficiency
z WLED Driver
` Auto-Selected by External Topology
` Current Source Mode with 30mA DC Current
` Step-Up Mode with LED Open Protection (OVP7)
` Direct PWM Dimming Control
z Fixed 2MHz Switching Frequency for CH1/2/3/4,
Fixed 1MHz Switching Frequency for CH5/6/7
z Small 32-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z Digital Still Camera
z PDA
z Portable Devices
Marking Information
EZ= : Product Code
EZ=YM
DNN
YMDNN : Date Code
DS9986A-00 May 2011
www.richtek.com
1
1 page  
Timing Diagram
Timing Diagram for CH1 to CH4
VDDM = Max
(BAT, PVDD1)
User define
EN1234
CH1 VOUT
CH3 VOUT
CH4 VOUT
CH2 VOUT
3.5ms
3.5ms
3.5ms
3.5ms
RT9986A
Wait until FB3 < 0.1V
Wait until FB4 < 0.1V
Wait until FB2 < 0.1V
CH5 and CH6 Power Sequence
The power on sequence is :
When EN56 goes high, CH5 will turn on first. After 10ms, CH6 will turn on.
The power off sequence is :
When EN56 goes low, CH6 will turn off first and VOUT6 will be internally pulled to GND.
When VOUT6 > −0.12V, CH6 discharging completes and then CH5 turns off. Finally, the whole IC shuts down.
Power On Sequence : CH5 HV Step-Up 15V → CH6 INV −7V
Power Off Sequence : CH6 INV −7V → CH5 HV Step-Up 15V
EN56
CH5
VOUT
CH6
VOUT
10ms
Constant Current
Pre-Charge.
10ms
Discharge by internal N-MOSFET
Wait until VOUT6 close to 0V
DS9986A-00 May 2011
www.richtek.com
5
5 Page 
RT9986A
Parameter
Thermal Protection
Thermal Shutdown
Thermal Shutdown Hysteresis
System Reset
SYSR, FB2 Regulation Threshold
SYSR, FB2 Hysteresis
SYSR Rising Delay Time
SYSR Sink Capability
Voltage Detector
Voltage Detector Reset Threshold
(VCHK < Threshold Æ RST = L)
Voltage Detector Reset Hysteresis
Standby Current
RST Rising Delay Time
RST Sink Capability
RTC LDO
Standby Current
Regulated Output Voltage @
RTCPWR
Max Output Current (Current Limit)
Dropout Voltage
Symbol
Test Conditions
TSD
ΔTSD
for SYSR to go low
VSYSR = 0.5V
VCHK Falling
VVCHK = 3V
VRST = 0.5V, VVCHK = 1.5V
VDDM = 4.2V
IOUT = 0mA
VDDM = 4.2V
IOUT = 50mA
IOUT = 10mA
IOUT = 3mA
Min Typ Max Unit
125 160
-- 20
--
--
°C
°C
0.709 0.72 0.731
-- 40 --
-- 10 --
4 -- --
V
mV
ms
mA
1.57 1.6 1.63 V
-- 16 -- mV
-- 2 4 μA
35 55 75 ms
4 -- -- mA
-- 5 8 μA
3.1 3.2 3.3 V
60 130 200 mA
-- -- 1000
-- -- 150 mV
-- -- 60
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. 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 for extended periods may
remain possibility to affect device reliability.
Note 2. θJA is measured in natural convection at TA = 25°C on a high-effective thermal conductivity four-layer test board of JEDEC
51-7 thermal measurement standard. The measurement case position of θJC is on the exposed pad 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.
DS9986A-00 May 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet RT9986A.PDF ] | |
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