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PDF RT8205M Data sheet ( Hoja de datos )
| Número de pieza | RT8205M | |
| Descripción | (RT8205L/M) Main Power Supply Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8205M (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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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.
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 require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z Constant On-time Control with 100ns Load Step
Response
z Wide Input Voltage Range : 6V to 25V
z Dual Adjustable Outputs from 2V to 5.5V
z Secondary Feedback Input Maintains Charge Pump
Voltage (RT8205M)
z Fixed 3.3V and 5V LDO Output : 100mA
z 2V Reference Voltage
z Frequency Selectable via TONSEL Setting
z 4700ppm/°C RDS(ON) Current Sensing
z Programmable Current Limit Combined with
Enable Control
z Selectable PWM, DEM, or Ultrasonic Mode
z Internal Soft-Start and Soft-Discharge
z High Efficiency up to 97%
z 5mW Quiescent Power Dissipation
z Thermal Shutdown
z RoHS Compliant and Halogen Free
http://www.DataSheet4U.net/
Applications
z Notebook and Sub-Notebook Computers
z 3-Cell and 4-Cell Li+ Battery-Powered Devices
DS8205L/M-05 June 2011
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
RT8205L/M
Pin No.
18
19
20
21
22
23
24
Pin Name
NC
(RT8205L)
SECFB
(RT8205M)
LGATE1
PHAS E1
UGATE1
BOOT1
PGOOD
VOUT1
No Internal Connection.
Pin Function
Charge Pump Control Pin. The SECFB is used to monitor the optional external 14V
charge pump. Connect a resistive voltage divider from the 14V charge pump output to
GND to detect the output. If SECFB drops below the threshold voltage, LGATE1 will
provide 33kHz switching frequency for the charge pump. This will refresh the external
charge pump driven by LGATE1 without over discharging the output voltage.
Lower Gate Drive Output for SMPS1. LGATE1 swings between GND and VREG5.
Switch Node for SMPS1. PHASE1 is the internal lower supply rail for the UGATE1 high
side gate driver. PHASE1 is also the current sense input for the SMPS1.
Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and BOOT1.
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor
according to the typical application circuits.
Power Good Output for Channel 1 and Channel 2. (Logical AND)
Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass efficient power for
VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge.
Function Block Diagram
TONSEL SKIPSEL
BOOT1
UGATE1
PHASE1
LGATE1
VREG5
VREG5
SMPS1
PWM Buck
Controller
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VREG5
SMPS2
PWM Buck
Controller
VREG5
FB1
ENTRIP1
EN
VOUT1
VREG5
VIN
Power-On
Sequence
Clear Fault Latch
SW5 Threshold
Thermal
Shutdown
VREG5
SW3 Threshold
REF
VREG3
DS8205L/M-05 June 2011
REF
BOOT2
UGATE2
PHASE2
LGATE2
VOUT2
FB2
ENTRIP2
PGOOD
GND
VREG3
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Typical Operating Characteristics
VOUT1 Efficiency vs. Load Current
100
90 DEM Mode
80
70
60 Ultrasonic Mode
50
PWM Mode
40
30
20
10
0
0.001
VIN = 8V, TONSEL = GND, VENTRIP1 = 1.5V,
ENTRIP2 =GND, EN= FLOATING
0.01 0.1
1
Load Current (A)
10
RT8205L/M
VOUT1 Efficiency vs. Load Current
100
90 DEM Mode
80
70
60 Ultrasonic Mode PWM Mode
50
40
30
20
10
0
0.001
VIN = 12V, TONSEL = GND,
VENTRIP1 = 1.5V, ENTRIP2 = GND,
EN = FLOATING
0.01
0.1
1
Load Current (A)
10
VOUT1 Efficiency vs. Load Current
100
90
DEM Mode
80
70
60
50 PWM Mode
40 Ultrasonic Mode
30
20
10
0
0.001
VIN = 20V, TONSEL = GND,
VENTRIP1 = 1.5V, ENTRIP2 = GND,
EN= FLOATING
0.01 0.1
1
Load Current (A)
10
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VOUT2 Efficiency vs. Load Current
100
90
80
70 DEM Mode
60
50 PWM Mode
40
30 Ultrasonic Mode
20
10
0
0.001
0.01
VIN = 12V, TONSEL = GND,
ENTRIP1 = GND, VENTRIP2 = 1.5V,
EN= FLOATING
0.1 1 10
Load Current (A)
VOUT2 Efficiency vs. Load Current
100
90
80 DEM Mode
70
60
50 PWM Mode
40 Ultrasonic Mode
30
20
10
0
0.001
VIN = 8V, TONSEL = GND,
ENTRIP1 = GND, VENTRIP2 = 1.5V,
EN= FLOATING
0.01 0.1
1
Load Current (A)
10
VOUT2 Efficiency vs. Load Current
100
90
80
70 DEM Mode
60
50 Ultrasonic PWM Mode
Mode
40
30
20
10
0
0.001
VIN = 20V, TONSEL = GND,
ENTRIP1 = GND, VENTRIP2 = 1.5V,
EN= FLOATING
0.01 0.1
1
Load Current (A)
10
DS8205L/M-05 June 2011
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet RT8205M.PDF ] | |
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