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PDF RT9711B Data sheet ( Hoja de datos )
| Número de pieza | RT9711B | |
| Descripción | 1.5A/0.6A High-Side Power Switches | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9711B (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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RT9711A/B/C/D
80mΩ, 1.5A/0.6A High-Side Power Switches with Flag
General Description
The RT9711A/B/C/D are cost-effective, low voltage, single
N-MOSFET high-side power switches, optimized for self-
powered and bus-powered Universal Serial Bus (USB)
applications. The RT9711 series are equipped with a
charge pump circuitry to drive the internal MOSFET switch.
The switch's low RDS(ON), 80mΩ, meets USB voltage drop
requirements. A flag output is available to indicate fault
conditions to the local USB controller.
Additional features include soft-start to limit inrush current
during plug-in, thermal shutdown to prevent catastrophic
switch failure from high-current loads, under-voltage
lockout (UVLO) to ensure that the device remains off
unless there is a valid input voltage present, fault current
is limited to typically 2.5A for RT9711A/B in dual ports
and 1A for RT9711C/D in single port in accordance with
the USB power requirements, lower quiescent current as
25μA making this device ideal for portable battery-operated
equipment.
The RT9711 series are available in SOT-23-5, TSOT-23-5,
SOP-8 and MSOP-8 packages fitting different aspect of
broad applications.
Features
z Compliant to USB Specifications
z Built-In N-MOSFET
` Typical RDS(ON) : 80mΩ (SOT-23-5 & TSOT-23-5) and
90mΩ (SOP-8 & MSOP-8)
z Output Can Be Forced Higher Than Input (Off-State)
z Low Supply Current :
25μA Typical at Switch On State
1μA Typical at Switch Off State
z Guaranteed 1.5A for RT9711A/B and 0.6A for
RT9711C/D Continuous Load Current
z Wide Input Voltage Ranges : 2.5V to 5.5V
z Open-Drain Fault Flag Output
z Hot Plug-In Application (Soft-Start)
z 1.7V Typical Under-Voltage Lockout (UVLO)
z Current Limiting Protection
z Thermal Shutdown Protection
z Reverse Current Flow Blocking (no body diode)
z Smallest SOT-23-5 and TSOT-23-5 Packages
Minimizes Board Space
z UL Approved−E219878
z TUV IEC60950-1 : 2005 Certified
z RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9711
Applications
Package Type
z USB Bus/Self Powered Hubs
B : SOT-23-5
z USB Peripherals
BG : SOT-23-5 (G-Type)
J5 : TSOT-23-5
S : SOP-8
F : MSOP-8
Lead Plating System
P : Pb Free
z ACPI Power Distribution
z PC Card Hot Swap
z Notebook, Motherboard PCs
z Battery-Powered Equipment
z Hot-Plug Power Supplies
G : Green (Halogen Free and Pb Free) z Battery-Charger Circuits
Note :
Output Current/EN Function
A : 1.5A/Active High
B : 1.5A/Active Low
C : 0.6A/Active High
D : 0.6A/Active Low
Richtek products are :
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
` 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.
DS9711A/B/C/D-03 April 2011
www.richtek.com
1
1 page  
Typical Operating Characteristics
Switch On Resistance vs. Temperature
0.25
0.2
0.15
0.1
0.05
SOP-8, VIN = 5V, ILOAD = 1.5A
CIN = 1uF/X7R, COUT = 10μF/X7R
0
-40 -20 0 20 40 60 80
Temperature (°C)
100 120
Switch on Resistance vs. Input Voltage
140
120
100
80
60
40
SOT-23-5, ILOAD = 1.5A
CIN = COUT = 33μF/Electrolytic
20
2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Supply Current vs. Temperature
30
25
20
15
10
5
VIN = 5V, Switch On, RLOAD Open
CIN = COUT = 33μF/Electrolytic
0
-40 -20 0 20 40 60
80
Temperature (°C)
100 120
DS9711A/B/C/D-03 April 2011
RT9711A/B/C/D
Switch On Resistance vs. Temperature
0.25
0.2
0.15
0.1
0.05
SOT-23-5, VIN = 5V, ILOAD = 1.5A
CIN = 1μF/X7R, COUT = 10μF/X7R
0
-40 -20 0 20 40 60
80
Temperature (°C)
100 120
Supply Current vs. Input Voltage
40
35
30
25
20
15
10
5 SOT-23-5, RL = Open
CIN = COUT = 33μF/Electrolytic
0
2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Current Limit vs. Input Voltage
2
1.8
1.6
1.4
1.2
RT9711A/B, VIN = VEN = 5V
CIN = 1μF/X7R, COUT = 10μF/X7R
1
2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
www.richtek.com
5
5 Page 
limit threshold is exceeded the device enters constant
current mode until the thermal shutdown occurs or the
fault is removed.
Thermal Shutdown
Thermal shutdown is employed to protect the device from
damage if the die temperature exceeds approxi- mately
130°C. If enabled, the switch automatically restarts when
the die temperature falls 20°C. The output and FLG signal
will continue to cycle on and off until the device is disabled
or the fault is removed.
Power Dissipation
The junction temperature of the RT9711 series depend on
several factors such as the load, PCB layout, ambient
temperature and package type. The output pin of
RT9711A/B/C/D can deliver the current of up to 1.5A
(RT9711A/B), and 0.6A (RT9711C/D) respectively over the
full operating junction temperature range. However, the
maximum output current must be derated at higher
ambient temperature to ensure the junction temperature
does not exceed 100°C. With all possible conditions, the
junction temperature must be within the range specified
under operating conditions. Power dissipation can be
calculated based on the output current and the RDS(ON) of
switch as below.
PD = RDS(ON) x IOUT2
Although the devices are rated for 1.5A and 0.6A of output
current, but the application may limit the amount of output
current based on the total power dissipation and the
ambient temperature. The final operating junction
temperature for any set of conditions can be estimated
by the following thermal equation :
PD (MAX) = (TJ (MAX) - TA) / θJA
Where TJ(MAX) is the maximum operation junction
temperature 125°C, TA is the ambient temperature and the
θJA is the junction to ambient thermal resistance.
The junction to ambient thermal resistance θJA is layout
dependent. For SOT-23-5 and TSOT-23-5 packages, the
thermal resistance θJA is 250°C/W on the standard JEDEC
51-3 single-layer thermal test board.
RT9711A/B/C/D
And for SOP-8 and MSOP-8 packages, the thermal
resistance θJA is 160°C/W. The maximum power
dissipation at TA = 25°C can be calculated by following
formula :
PD(MAX) = (125°C − 25°C) / 250°C/W = 0.4W for
SOT-23-5 and TSOT-23-5 packages
PD(MAX) = (125°C − 25°C) / 160°C/W = 0.625W for
SOP-8 and MSOP-8 packages
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(MAX) and thermal
resistance θJA. For RT9711A/B/C/D packages, the Figure
1 of derating curves allows the designer to see the effect
of rising ambient temperature on the maximum power
allowed.
0.7
Single Layer PCB
0.6
0.5 SOP-8, MSOP-8
0.4
0.3
0.2 SOT-23-5, TSOT-23-5
0.1
0
0 25 50 75 100 125
Ambient Temperature (°C)
Figure 1. Derating Curves for RT9711A/B/C/D Package
Universal Serial Bus (USB) & Power Distribution
The goal of USB is to be enabled device from different
vendors to interoperate in an open architecture. USB
features include ease of use for the end user, a wide range
of workloads and applications, robustness, synergy with
the PC industry, and low-cost implement- ation. Benefits
include self-identifying peripherals, dynamically attachable
and reconfigurable peripherals, multiple connections
(support for concurrent operation of many devices), support
for as many as 127 physical devices, and compatibility
with PC Plug-and-Play architecture.
The Universal Serial Bus connects USB devices with a
USB host: each USB system has one USB host. USB
devices are classified either as hubs, which provide
DS9711A/B/C/D-03 April 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet RT9711B.PDF ] | |
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