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Número de pieza | TDA21201 | |
Descripción | Integrated Switch(MOSFET Driver and MOSFETs) | |
Fabricantes | Infineon Technologies | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de TDA21201 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
No Preview Available ! Preliminary Data Sheet
TDA21201
Integrated Switch
(MOSFET Driver and MOSFETs)
Features
• Replaces with one part only the semiconductors of a DC/DC
power stage for a 12 V à 1 ... 3.3 V conversion:
FET driver + High side FET + Low side FET
• Raises the efficiency by reducing static and dynamic losses
beyond 85 % due to optimized MOSFETs and Driver
• Reduces overall part count and board space consumption P-TO220-7-3
• Simplifies and shortens the circuit design and the layout
• Eliminates the need for external bootstrap components
• Provides simplest overall output current scalability
• Protects the Driver and the MOSFETs against over-
temperature and shoot-through problems Vcc à Gnd
• Achieves the lowest thermal resistance Rthjc and Rthja
• Uses the well-known, easy-to-assemble and robust
P-TO220-7-230
standard TO-220 and TO-263 (D²Pak) package
• Requires no separate supply voltage to operate except 12 V
• Three state input to enable a shut down mode to turn off
both MOSFETs
• Compatible with standard 2-, 3-, 4-, 6-phase PWM controller
ICs
1
• Ideal for compact, highly-efficient, multi-phase voltage
P-TO263-7-2
regulators on motherboards and VRMs
7
Type
TDA21201-P7
TDA21201-S7
TDA21201-B7
Package
Marking
TO-220-7-3 21201P7
TO-220-7-230 21201S7
TO-263-7-2 21201B7
Ordering Code
Q67042-S4100
Q67042-S4101
Q67042-S4099
Pin Configuration and Function
Pin number
1,2,3
4/tab
5
6,7
Pin name
GND
VOUT
IN
VCC
Pin description
Ground
Output voltage from common node of the MOSFETs
Input signal from PWM controller
Supply voltage to MOSFETs and Driver IC
General Description
The Integrated Switch TDA21201 incorporates an intelligent MOSFET driver and two
Power MOSFETs in a single package to form a fully integrated and optimized power
stage of a DC/DC synchronous buck converter including the bootstrap components
for the high-side MOSFET.
The Power MOSFETs are optimized for lowest static and dynamic losses for a 12 V
to sub-3.5 V conversion and can handle up to 30 A output current. The TDA21201 is
manufactured in Infineon´s state-of-the-art multi-chip assembly using a low-Rth 7-Pin
Page 1
Apr-29, 2002
1 page Preliminary Data Sheet
TDA21201
Designing a 12 V to sub-3.3 V converter using the TDA21201
General info
To design a multi-phase converter with a 12 V input simply use in each phase
just one TDA21201 instead of using a MOSFET driver, a high side MOSFET,
bootstrap components, and one or more low side MOSFETs. The entire
converter is completed by the input filter, the output filter and a multi-phase
PWM IC.
Input compatibility to standard PWM controllers / shut-down mode
The Integrated Switch TDA21201 has a high impedance input pin ‘IN’ to be
connected to PWM controller outputs ‘PWM1’, ‘PWM2’ etc. It sinks or sources
only a fraction of a mA from the controller’s output. The TDA21201 is
compatible to standard controller and driver signals in terms of the signal level
(5 V TTL) and in terms of the ‘Low’/’High’ relationship (’Low’ turns the low side
MOSFET on, ‘High` turns the High side MOSFET on).
The TDA21201 can be shut down (the high side MOSFET and the low side
MOSFET is turned off) by applying an input signal VIN = 1.2 ... 1.6 V for more
than 1.5 µs typical. This way the TDA21201 reduces the power dissipation by
saving the gate charges of both the high side and the low side MOSFET
during no load conditions. The shutdown state is terminated when VIN moves
into the ‘Low’ or ‘High’ threshold.
Typical Application: 12 V à 1.x V N-Phase Converter using the TDA21201
12 V
PWM
IC
PWM 1
PWM 2
PWM N
FET
Driver
1
FET
Driver
N
L1 1...2 V
C
LN
Page 5
Apr-29, 2002
5 Page Preliminary Data Sheet
TDA21201
Having the power dissipation Pd of the Integrated Switch, the required thermal
resistance RthCA can be calculated. RthCA is the value of the heat sink
attached to the TO-220 version of the Integrated Switch. RthCA is the
“effective” thermal resistance (takes airflow etc. into account):
RthCA ≤ Tj _ max− TA − Rthjc
Pd
Wherein:
RthCA = Thermal resistance from the package’s metal backside
(= lead frame) to ambient air that is required to operate the
Integrated Switch under given load and environmental
conditions without exceeding the maximum allowed
junction temperature; in [°C/W]
Tj_max = Maximum allowed junction temperature of the Integrated
Switch; in [°C], use 110 °C for the SMD version of the
Integrated Switch, use 125 °C for the TO-220 version of
the Integrated Switch
TA = The ambient temperature; in [°C], usually this is the
maximum temperature of the surrounding air @ worst
case, e.g. 55 °C
Pd = The power loss generated in the Integrated Switch that
needs to be dissipated through the heat sink à air
(TO-220) or the PCB à air for thermal balance; in [W], use
one of the two diagrams Pd vs. Iphase or Pd vs. f_sw to
find the this value for your particular application
Rthjc = Thermal resistance junction to case of the Integrated Switch;
in [K/W], use ≤ 2 K/W (s. also pg. 3 and 4 “Thermal
characteristic of the High side/Low side MOSFET” in this
data sheet; the majority of the losses are generated within
the MOSFETs, not in the driver)
Efficiency of a DC/DC converter using the Integrated Switch TDA21201
The following measurements were performed on a 4-phase Evaluation Board.
Phase 4 can be disabled so that the converter operates in a 3-phase mode.
Boundary Conditions: Vcc = 12 V, Vo = 1.6 V, TDA21201 as SMD
I 4-Phase Converter: Efficiency vs. Load current
95
90
85
80
75
70
65
0
f_1 = 185 kHz
f_2 = 305 kHz
20 40 60
Load Current [A]
80
Page 11
Apr-29, 2002
11 Page |
Páginas | Total 15 Páginas | |
PDF Descargar | [ Datasheet TDA21201.PDF ] |
Número de pieza | Descripción | Fabricantes |
TDA21201 | Integrated Switch(MOSFET Driver and MOSFETs) | Infineon Technologies |
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