RT8205L/M
High Efficiency, Main Power Supply Controller for Notebook Computer
General Description
The RT8205L/M is a dual step-down, switch mode power supply controller generating logic-supply voltages in battery powered systems. It includes two Pulse-Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and also features fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the PWM outputs. An optional external charge pump can be monitored through SECFB (RT8205M). The RT8205L/M includes on-board power up sequencing, a power good output, internal soft-start, and internal soft-discharge output that prevents negative voltage during shutdown.
The constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, the diode-emulation mode maximizes efficiency for light load applications. The RT8205L/M is available in a WQFN-24L 4x4 package.
Features
zConstant On-time Control with 100ns Load Step Response
zWide Input Voltage Range : 6V to 25V
zDual Adjustable Outputs from 2V to 5.5V
zSecondary Feedback Input Maintains Charge Pump Voltage (RT8205M)
zFixed 3.3V and 5V LDO Output : 100mA
z2V Reference Voltage
zFrequency Selectable via TONSEL Setting
z4700ppm/°C RDS(ON) Current Sensing
zProgrammable Current Limit Combined with Enable Control
zSelectable PWM, DEM, or Ultrasonic Mode
zInternal Soft-Start and Soft-Discharge
zHigh Efficiency up to 97%
z5mW Quiescent Power Dissipation
zThermal Shutdown
zRoHS Compliant and Halogen Free
Applications
zNotebook and Sub-Notebook Computers
z3-Cell and 4-Cell Li+ Battery-Powered Devices
Ordering Information
RT8205 
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Pin Function
L : Default
M : With SECFB
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.
DS8205L/M-05 June 2011 |
www.richtek.com |
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RT8205L/M
Marking Information
RT8205LGQW |
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RT8205MGQW |
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EM= : Product Code |
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EN= : Product Code |
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EM=YM |
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YMDNN : Date Code |
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EN=YM |
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YMDNN : Date Code |
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DNN |
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DNN |
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RT8205LZQW |
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RT8205MZQW |
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EM : Product Code |
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EN : Product Code |
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EM YM |
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YMDNN : Date Code |
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EN YM |
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YMDNN : Date Code |
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DNN |
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DNN |
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Pin Configurations
(TOP VIEW)
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VOUT1 |
PGOOD |
BOOT1 |
UGATE1 |
PHASE1 |
LGATE1 |
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24 |
23 |
22 |
21 |
20 |
19 |
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ENTRIP1 |
1 |
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18 |
NC |
FB1 |
2 |
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17 |
VREG5 |
REF |
3 |
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GND |
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16 |
VIN |
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TONSEL |
4 |
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15 |
GND |
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FB2 |
5 |
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25 |
14 |
SKIPSEL |
ENTRIP2 |
6 |
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13 |
EN |
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7 |
8 |
9 |
10 |
11 |
12 |
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VOUT2 |
VREG3 |
BOOT2 |
UGATE2 |
PHASE2 |
LGATE2 |
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WQFN-24L 4x4 |
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RT8205L
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VOUT1 |
PGOOD |
BOOT1 |
UGATE1 |
PHASE1 |
LGATE1 |
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24 |
23 |
22 |
21 |
20 |
19 |
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ENTRIP1 |
1 |
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18 |
SECFB |
FB1 |
2 |
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17 |
VREG5 |
REF |
3 |
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GND |
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16 |
VIN |
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TONSEL |
4 |
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15 |
GND |
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FB2 |
5 |
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25 |
14 |
SKIPSEL |
ENTRIP2 |
6 |
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13 |
EN |
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7 |
8 |
9 |
10 |
11 |
12 |
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VOUT2 |
VREG3 |
BOOT2 |
UGATE2 |
PHASE2 |
LGATE2 |
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WQFN-24L 4x4 |
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RT8205M
www.richtek.com |
DS8205L/M-05 June 2011 |
2 |
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RT8205L/M
Typical Application Circuit
VIN
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R8 |
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6V to 25V |
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C1 |
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RT8205L |
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R10 |
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C13 |
C12 |
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3.9 |
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10µF |
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16 |
VIN |
UGATE2 |
10 |
0 |
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Q2 |
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10µF |
10µF |
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C10 |
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R |
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BSC119 |
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0 |
N03S |
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0.1µF |
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BOOT2 |
9 |
BOOT2 |
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R4 0 |
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C11 |
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L2 |
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Q1 |
21 UGATE1 |
PHASE2 |
11 |
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0.1µF |
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4.7µH |
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VOUT2 |
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BSC119 |
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3.3V |
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N03S |
RBOOT1 |
0 |
22 BOOT1 |
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12 |
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Q4 |
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LGATE2 |
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R11 |
C17 |
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C2 |
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GND 15 |
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BSC119 |
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220µF |
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V |
L1 |
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N03S |
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C14 |
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6.8µH |
0.1µF |
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OUT1 |
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20 PHASE1 |
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5V |
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VOUT2 |
7 |
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C3 |
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Q3 |
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19 |
LGATE1 |
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R5 |
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FB2 |
5 |
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R14 |
C21 |
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220µF |
BSC119 |
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R |
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6.5k |
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C4 |
N03S |
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ILIM1 |
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ENTRIP1 1 |
150k |
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C20 |
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24 VOUT1 |
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RILIM2 |
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R15 |
0.1µF |
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C18 |
R12 |
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ENTRIP2 6 |
150k |
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10k |
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15k |
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2 FB1 |
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25 (Exposed Pad) |
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C19 |
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GND |
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R13 |
VREF |
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3 REF |
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0.1µF |
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10k |
2V |
C15 |
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VREG5 |
17 |
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5V Always On |
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0.22µF |
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C9 |
R6 |
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Frequency Control |
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4 TONSEL |
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4.7µF |
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100k |
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PGOOD 23 |
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PWM/DEM/Ultrasonic |
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14 SKIPSEL |
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PGOOD Indicator |
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ON |
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13 EN |
VREG3 |
8 |
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C16 |
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3.3V Always On |
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OFF |
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4.7µF |
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VIN
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R8 |
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6V to 25V |
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C1 |
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RT8205M |
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R10 |
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C13 |
C12 |
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3.9 |
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10µF |
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16 VIN |
UGATE2 10 |
0 |
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Q2 |
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10µF |
10µF |
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C10 |
R |
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BSC119 |
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0 |
N03S |
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0.1µF |
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BOOT2 9 |
BOOT2 |
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R4 0 |
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C11 |
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L2 |
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Q1 |
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21 UGATE1 |
PHASE2 |
11 |
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0.1µF |
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4.7µH |
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VOUT2 |
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BSC119 |
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3.3V |
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N03S |
R |
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0 |
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22 BOOT1 |
LGATE2 12 |
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Q4 |
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BOOT1 |
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R11 |
C17 |
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C2 |
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GND 15 |
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BSC119 |
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220µF |
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V |
L1 |
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N03S |
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C14 |
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6.8µH |
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0.1µF |
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OUT1 |
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20 PHASE1 |
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5V |
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VOUT2 |
7 |
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C3 |
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Q3 |
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19 |
LGATE1 |
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R5 |
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FB2 |
5 |
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R14 |
C21 |
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220µF |
BSC119 |
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C4 |
N03S |
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RILIM1 |
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6.5k |
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C20 |
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ENTRIP1 1 |
150k |
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R15 |
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24 VOUT1 |
R |
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0.1µF |
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C18 |
R12 |
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ILIM2 |
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10k |
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ENTRIP2 6 |
150k |
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15k |
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2 FB1 |
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C19 |
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25 (Exposed Pad) |
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R13 |
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D1 |
C5 |
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GND |
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0.1µF |
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10k |
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0.1µF |
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C6 |
D2 |
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VREG5 |
17 |
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5V Always On |
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0.1µF |
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C7 |
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C9 |
R6 |
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D3 |
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4.7µF |
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0.1µF |
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100k |
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PGOOD 23 |
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D4 |
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PGOOD Indicator |
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C8 |
BAT254 |
R6 |
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18 SECFB |
VREG3 8 |
C16 |
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3.3V Always On |
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0.1µF |
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200k |
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R7 |
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4.7µF |
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3 |
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VREF |
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CP |
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39k |
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REF |
C15 |
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2V |
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0.22µF |
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ON |
13 |
TONSEL 4 |
EN |
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OFF |
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SKIPSEL 14 |
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Frequency Control
PWM/DEM/Ultrasonic
DS8205L/M-05 June 2011 |
www.richtek.com |
|
3 |
RT8205L/M
Functional Pin Description
Pin No. |
Pin Name |
Pin Function |
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Channel 1 Enable and Current Limit Setting Input. Connect a resistor to GND to |
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set the threshold for channel 1 synchronous RDS(ON) sense. The GND − PHASE1 |
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1 |
ENTRIP1 |
current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.515V to 3V |
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range. There is an internal 10μA current source from VREG5 to ENTRIP1. Leave |
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ENTRIP1 floating or drive it above 4.5V to shutdown channel 1. |
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2 |
FB1 |
SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from VOUT1 |
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to GND to adjust output from 2V to 5.5V. |
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2V Reference Output. Bypass to GND with a minimum 0.22μF capacitor. REF |
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3 |
REF |
can source up to 100μA for external loads. Loading REF degrades FBx and |
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output accuracy according to the REF load regulation error. |
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Frequency Selectable Input for VOUT1/VOUT2 respectively. |
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4 |
TONSEL |
400kHz/500kHz : Connect to VREG5 or VREG3 |
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300kHz/375kHz : Connect to REF |
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200kHz/250kHz : Connect to GND |
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5 |
FB2 |
SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from VOUT2 |
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to GND to adjust output from 2V to 5.5V. |
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Channel 2 Enable and Current Limit Setting Input. Connect a resistor to GND to |
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6 |
ENTRIP2 |
set the threshold for channel 2 synchronous RDS(ON) sense. The GND − PHASE2 |
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current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.515V to 3V |
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range. There is an internal 10μA current source from VREG5 to ENTRIP2. Leave |
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ENTRIP2 floating or drive it above 4.5V to shutdown channel 1. |
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7 |
VOUT2 |
Bypass Pin for SMPS2. Connect to the SMPS2 output to bypass efficient power |
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for VREG3 pin. VOUT2 is also for the SMPS2 output soft-discharge. |
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8 |
VREG3 |
3.3V Linear Regulator Output. |
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9 |
BOOT2 |
Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor |
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according to the typical application circuits. |
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10 |
UGATE2 |
Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and |
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BOOT2. |
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Switch Node for SMPS2. PHASE2 is the internal lower supply rail for the |
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11 |
PHASE2 |
UGATE2 high side gate driver. PHASE2 is also the current sense input for the |
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SMPS2. |
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12 |
LGATE2 |
Lower Gate Drive Output for SMPS2. LGATE2 swings between GND and |
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VREG5. |
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13 |
EN |
Master Enable Input. The REF/VREG5/VREG3 are enabled if it is within logic |
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high level and disabled if it is less than the logic low level. |
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Operation Mode Selectable Input. |
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14 |
SKIPSEL |
Connect to VREG5 or VREG3 : Ultrasonic Mode |
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Connect to REF : DEM Mode |
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Connect to GND : PWM Mode |
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15, |
GND |
Ground for SMPS Controller. The exposed pad must be soldered to a large PCB |
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25 (Exposed Pad) |
and connected to GND for maximum power dissipation. |
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16 |
VIN |
Supply Input for 5V/3.3V LDO and Feed Forward On Time Circuitry. |
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17 |
VREG5 |
5V Linear Regulator Output. VREG5 is also the supply voltage for the lower gate |
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driver and analog supply voltage for the device. |
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To be continued |
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www.richtek.com |
DS8205L/M-05 June 2011 |
4 |
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RT8205L/M
Pin No. |
Pin Name |
Pin Function |
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NC |
No Internal Connection. |
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(RT8205L) |
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18 |
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Charge Pump Control Pin. The SECFB is used to monitor the optional external 14V |
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SECFB |
charge pump. Connect a resistive voltage divider from the 14V charge pump output to |
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GND to detect the output. If SECFB drops below the threshold voltage, LGATE1 will |
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(RT8205M) |
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provide 33kHz switching frequency for the charge pump. This will refresh the external |
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charge pump driven by LGATE1 without over discharging the output voltage. |
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19 |
LGATE1 |
Lower Gate Drive Output for SMPS1. LGATE1 swings between GND and VREG5. |
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20 |
PHASE1 |
Switch Node for SMPS1. PHASE1 is the internal lower supply rail for the UGATE1 high |
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side gate driver. PHASE1 is also the current sense input for the SMPS1. |
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21 |
UGATE1 |
Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and BOOT1. |
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22 |
BOOT1 |
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor |
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according to the typical application circuits. |
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23 |
PGOOD |
Power Good Output for Channel 1 and Channel 2. (Logical AND) |
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24 |
VOUT1 |
Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass efficient power for |
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VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge. |
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Function Block Diagram
TONSEL SKIPSEL
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BOOT1 |
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BOOT2 |
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UGATE1 |
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UGATE2 |
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PHASE1 |
VREG5 |
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PHASE2 |
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VREG5 |
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SMPS1 |
SMPS2 |
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LGATE1 |
PWM Buck |
PWM Buck |
LGATE2 |
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Controller |
Controller |
VREG5 |
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VREG5 |
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FB1 |
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VOUT2 |
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FB2 |
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ENTRIP1 |
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ENTRIP2 |
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EN |
Power-On |
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PGOOD |
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Sequence |
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Clear Fault Latch |
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GND |
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SW5 Threshold |
SW3 Threshold |
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VOUT1 |
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Thermal |
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Shutdown |
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VREG5 |
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VREG3 |
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VREG5 |
REF |
VREG3 |
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VIN |
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REF |
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DS8205L/M-05 |
June 2011 |
|
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www.richtek.com |
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|
5 |
RT8205L/M
Absolute Maximum Ratings (Note 1)
z VIN, EN to GND ----------------------------------------------------------------------------------------------- |
−0.3V to 30V |
z PHASEx to GND |
|
DC ---------------------------------------------------------------------------------------------------------------- |
−0.3V to 30V |
< 20ns----------------------------------------------------------------------------------------------------------- |
−8V to 38V |
z BOOTx to PHASEx ------------------------------------------------------------------------------------------ |
−0.3V to 6V |
z ENTRIPx, SKIPSEL, TONSEL, PGOOD to GND ------------------------------------------------------ |
−0.3V to 6V |
z VREG5, VREG3, FBx , VOUTx, SECFB, REF to GND ---------------------------------------------- |
−0.3V to 6V |
z UGATEx to PHASEx |
|
DC ---------------------------------------------------------------------------------------------------------------- |
−0.3V to (VREG5 + 0.3V) |
< 20ns----------------------------------------------------------------------------------------------------------- |
−5V to 7.5V |
z LGATEx to GND |
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DC ---------------------------------------------------------------------------------------------------------------- |
−0.3V to (VREG5 + 0.3V) |
< 20ns----------------------------------------------------------------------------------------------------------- |
−2.5V to 7.5V |
z Power Dissipation, PD @ TA = 25°C |
|
WQFN-24L-4x4 ------------------------------------------------------------------------------------------------ |
1.923W |
z Package Thermal Resistance (Note 2) |
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WQFN-24L-4x4, θJA ------------------------------------------------------------------------------------------ |
52°C/W |
WQFN-24L-4x4, θJC ------------------------------------------------------------------------------------------ |
7°C/W |
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------ |
260°C |
z Junction Temperature ---------------------------------------------------------------------------------------- |
150°C |
z Storage Temperature Range -------------------------------------------------------------------------------- |
−65°C to 150°C |
z ESD Susceptibility (Note 3) |
|
HBM (Human Body Mode) ---------------------------------------------------------------------------------- |
2kV |
MM (Machine Mode) ----------------------------------------------------------------------------------------- |
200V |
Recommended Operating Conditions |
(Note 4) |
z Supply Input Voltage, VIN ----------------------------------------------------------------------------------- |
6V to 25V |
z Junction Temperature Range ------------------------------------------------------------------------------- |
−40°C to 125°C |
z Ambient Temperature Range ------------------------------------------------------------------------------- |
−40°C to 85°C |
www.richtek.com |
DS8205L/M-05 June 2011 |
6 |
|
RT8205L/M
Electrical Characteristics
(VIN = 12V, VEN = 5V, VENTRIP1 = VENTRIP2 = 2V, No Load, TA = 25°C, unless otherwise specified)
Parameter |
|
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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Input Supply |
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VIN Standby Current |
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IVIN_SBY |
VIN = 6V to 25V, ENTRIPx = GND |
-- |
200 |
-- |
μA |
||
VIN Shutdown Supply |
|
IVIN_SHDN |
VIN = 6V to 25V, |
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-- |
20 |
40 |
μA |
Current |
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ENTRIPx = EN = GND |
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Quiescent Power |
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PVIN |
Both SMPS On, VFBx = 2.1V, |
-- |
5 |
7 |
mW |
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SKIPSEL = REF, VOUT1 = 5V, |
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Consumption |
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+PPVCC |
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VOUT2 = 3.3V |
(Note 5) |
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SMPS Output and FB Voltage |
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DEM Mode |
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1.975 |
2 |
2.025 |
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FBx Voltage |
|
VFBx |
PWM Mode (Note 6) |
-- |
2 |
-- |
V |
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Ultrasonic Mode |
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-- |
2.032 |
-- |
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SECFB Voltage |
|
VSECFB |
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1.92 |
2 |
2.08 |
V |
Output Voltage Adjust |
|
VOUTx |
SMPS1, SMPS2 |
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2 |
-- |
5.5 |
V |
Range |
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VOUTx Discharge |
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VOUTx = 0.5V, VENTRIPx = 0V |
10 |
45 |
-- |
mA |
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Current |
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On-Time |
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TONSEL = GND |
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VOUT1 = 5.05V (200kHz) |
1895 |
2105 |
2315 |
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VOUT2 = 3.33V (250kHz) |
999 |
1110 |
1221 |
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On-Time Pulse Width |
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tON |
TONSEL = REF |
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VOUT1 = 5.05V (300kHz) |
1227 |
1403 |
1579 |
ns |
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VOUT2 = 3.33V (375kHz) |
647 |
740 |
833 |
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TONSEL = |
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VOUT1 = 5.05V (400kHz) |
895 |
1052 |
1209 |
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VREG5 |
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VOUT2 = 3.33V (500kHz) |
475 |
555 |
635 |
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Minimum Off-Time |
|
tOFF |
FBx = 1.9V |
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200 |
300 |
400 |
ns |
Ultrasonic Mode |
|
|
SKIPSEL = VREG5 or VREG3 |
22 |
33 |
-- |
kHz |
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Frequency |
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Soft-Start |
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Soft-Start Time |
|
tSSx |
Internal Soft-Start |
-- |
2 |
-- |
ms |
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Current Sense |
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ENTRIPx Source |
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IENTRIPx |
VENTRIPx = 0.9V |
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9.4 |
10 |
10.6 |
μA |
Current |
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|
||||||
ENTRIPx Current |
|
|
In Comparison with 25°C (Note 6) |
-- |
4700 |
-- |
ppm/°C |
||
Temperature |
|
TCIENTRIPx |
|||||||
Coefficient |
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ENTRIPx Adjustment |
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VENTRIPx = IENTRIPx x RENTRIPx |
0.515 |
-- |
3 |
V |
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Range |
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Current Limit |
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GND − PHASEx, VENTRIPx = 2V |
180 |
200 |
220 |
mV |
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Threshold |
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Zero-Current |
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GND − PHASEx in DEM |
-- |
3 |
-- |
mV |
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Threshold |
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To be continued |
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|
DS8205L/M-05 June 2011 |
|
|
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|
www.richtek.com |
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7 |
RT8205L/M
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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Internal Regulator and Reference |
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VOUT1 = GND, IVREG5 < 100mA |
4.8 |
5 |
5.2 |
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VREG5 Output Voltage |
VVREG5 |
VOUT1 = GND, 6.5V < VIN < 25V, |
4.75 |
5 |
5.25 |
V |
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IVREG5 < 100mA |
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VOUT1 = GND, 5.5V < VIN < 25V, |
4.75 |
5 |
5.25 |
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IVREG5 < 50mA |
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VOUT2 = GND, IVREG3 < 100mA |
3.2 |
3.33 |
3.46 |
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VREG3 Output Voltage |
VVREG3 |
VOUT2 = GND, 6.5V < VIN < 25V, |
3.13 |
3.33 |
3.5 |
V |
|
IVREG3 < 100mA |
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|
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VOUT2 = GND, 5.5V < VIN < 25V, |
3.13 |
3.33 |
3.5 |
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IVREG3 < 50mA |
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VREG5 Output Current |
IVREG5 |
VVREG5 = 4.5V, VOUT1 = GND |
100 |
175 |
250 |
mA |
|
VREG3 Output Current |
IVREG3 |
VVREG3 = 3V, VOUT2 = GND |
100 |
175 |
250 |
mA |
|
VREG5 Switchover |
VSW5 |
VOUT1 Rising Edge |
4.6 |
4.75 |
4.9 |
V |
|
Threshold to VOUT1 |
VOUT1 Falling Edge |
4.3 |
4.4 |
4.5 |
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VREG3 Switchover |
VSW3 |
VOUT2 Rising Edge |
2.975 |
3.125 |
3.25 |
V |
|
Threshold to VOUT2 |
VOUT2 Falling Edge |
2.775 |
2.875 |
2.975 |
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|
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VREGx Switchover Equivalent |
RSWx |
VREGx to VOUTx, 10mA |
-- |
1.5 |
3 |
Ω |
|
Resistance |
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|
|
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|
|
REF Output Voltage |
VREF |
No External Load |
1.98 |
2 |
2.02 |
V |
|
REF Load Regulation |
|
0 < ILOAD < 100μA |
-- |
10 |
-- |
mV |
|
REF Sink Current |
|
REF in Regulation |
5 |
-- |
-- |
μA |
|
UVLO |
|
|
|
|
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|
|
VREG5 Under Voltage |
|
Rising Edge |
-- |
4.20 |
4.35 |
V |
|
Lockout Threshold |
|
Falling Edge |
3.7 |
3.9 |
4.1 |
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VREG3 Under Voltage |
|
SMPSx off |
-- |
2.5 |
-- |
V |
|
Lockout Threshold |
|
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Power Good |
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PGOOD Threshold |
|
PGOOD Detect, FBx Falling Edge |
82 |
85 |
88 |
% |
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|||
|
Hysteresis, Rising Edge with SS |
-- |
6 |
-- |
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|
Delay Time |
|
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||
PGOOD Propagation Delay |
|
Falling Edge, 50mV Overdrive |
-- |
10 |
-- |
μs |
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|
|
PGOOD Leakage Current |
|
High State, Forced to 5.5V |
-- |
-- |
1 |
μA |
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PGOOD Output Low Voltage |
|
ISINK = 4mA |
-- |
-- |
0.3 |
V |
|
Fault Detection |
|
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|
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|
|
Over Voltage Protection Trip |
VFB_OVP |
OVP Detect, FBx Rising Edge |
109 |
112 |
116 |
% |
|
Threshold |
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||
Over Voltage Protection |
|
FBx = 2.35V |
-- |
5 |
-- |
μs |
|
Propagation Delay |
|
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|
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|
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||
Under Voltage Protection Trip |
VFB_UVP |
UVP Detect, FBx Falling Edge |
49 |
52 |
56 |
% |
|
Threshold |
|
|
|
|
|
|
|
UVP Shutdown Blanking Time |
tSHDN_UVP |
From ENTRIPx Enable |
-- |
5 |
-- |
ms |
|
|
To be continued |
|
|
www.richtek.com |
DS8205L/M-05 June 2011 |
8 |
|
RT8205L/M
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
|
Thermal Shutdown |
|
|
|
|
|
|
|
Thermal Shutdown |
TSHDN |
|
-- |
150 |
-- |
°C |
|
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|
|
Thermal Shutdown |
|
|
-- |
10 |
-- |
°C |
|
Hysteresis |
|
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Logic Input |
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|
|
Low Level (PWM Mode) |
-- |
-- |
0.8 |
|
SKIPSEL Input Voltage |
|
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|
|
|
REF Level (DEM Mode) |
1.8 |
-- |
2.3 |
V |
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High Level (Ultrasonic Mode) |
2.7 |
-- |
-- |
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|
|
Low Level (SMPS Off) |
-- |
-- |
0.25 |
|
ENTRIPx Input Voltage |
VENTRIPx |
On Level (SMPS On) |
0.515 |
-- |
3 |
V |
|
|
|
|
High Level (SMPS Off) |
4.5 |
-- |
-- |
|
EN Threshold |
Logic-High |
VIH |
|
1 |
-- |
-- |
V |
Voltage |
Logic-Low |
VIL |
|
-- |
-- |
0.4 |
|
|
|
||||||
EN Voltage |
|
VEN |
Floating, Default Enable |
2.4 |
3.3 |
4.2 |
V |
EN Current |
|
IEN |
VEN = 0.2V, Source |
1.5 |
3 |
5 |
μA |
|
VEN = 5V, Sink |
-- |
3 |
8 |
|||
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|
||||
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|
|
VOUT1 / VOUT2 = 200kHz / 250kHz |
-- |
-- |
0.8 |
|
TONSEL Setting Voltage |
|
VOUT1 / VOUT2 = 300kHz / 375kHz |
1.8 |
-- |
2.3 |
V |
|
|
|
|
VOUT1 / VOUT2 = 400kHz / 500kHz |
2.7 |
-- |
-- |
|
Input Leakage Current |
|
VTONSEL, VSKIPSEL = 0V or 5V |
−1 |
-- |
1 |
μA |
|
|
VSECFB = 0V or 5V |
−1 |
-- |
1 |
|||
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|
||||
Internal BOOT Switch |
|
|
|
|
|
|
|
Internal Boost Switch |
|
VREG5 to BOOTx, 10mA |
-- |
40 |
80 |
Ω |
|
On-Resistance |
|
|
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Power MOSFET Drivers |
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|
|
|
|
UGATEx, High State, |
-- |
4 |
8 |
|
|
|
|
BOOTx to PHASEx Forced to 5V |
|
|||
UGATEx On-Resistance |
|
|
|
|
Ω |
||
|
UGATEx, Low State, |
-- |
1.5 |
4 |
|||
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|
||||
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|
|
BOOTx to PHASEx Forced to 5V |
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|||
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LGATEx On-Resistance |
|
LGATEx, High State |
-- |
4 |
8 |
Ω |
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|||
|
LGATEx, Low State |
-- |
1.5 |
4 |
|||
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|
||||
Dead Time |
|
|
LGATEx Rising |
-- |
30 |
-- |
ns |
|
|
UGATEx Rising |
-- |
40 |
-- |
||
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|
||||
DS8205L/M-05 June 2011 |
www.richtek.com |
|
9 |
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