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PWM Controller. TD9000 Datasheet |
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T echcode®
High-Performance
PWM
Controller
DATASHEET
TD9000
General Description
Features
The TD9000 is a single‐phase, constant‐on‐time, synchron‐
ous PWM controller, which drives N‐channel MOSFETs.
The TD9000 steps down high voltage to generate low
voltage chipset or RAM supplies in notebook computers.
The TD9000 provides excellent transient response and
accurate DC voltage output in either PFM or PWM Mode. In
Pulse Frequency Mode (PFM), the TD9000 provides very high
efficiency over light to heavy loads with loading‐ modulated
switching frequencies. In PWM Mode, the converter works
nearly at constant frequency for low‐noise requirements.
The TD9000 is equipped with accurate positive current‐ limit,
output under‐voltage, and output over‐voltage prote‐
ctions, perfect for NB applications. The Power‐On‐ Reset
function monitors the voltage on VCC to prevent wrong
operation during power‐on. The TD9000 has a 1ms digital
soft‐start and built‐in an integrated output discharge
method for soft‐stop. An internal integrated soft‐start
ramps up the output voltage with programmable slew rate to
reduce the start‐up current. A soft‐stop function actively
discharges the output capacitors with controlled reverse
inductor current.
The TD9000 is available in 10pin TDFN 3x3 package.
Easy pass EMI test
Adjustable Output Voltage from +0.7V to +5.5V
0.7V Reference Voltage
±1% Accuracy Over‐Temperature
Operates from an Input Battery Voltage Range of +1.8V
to +36V
Power‐On‐Reset Monitoring on VCC Pin
Excellent Line and Load Transient Responses
PFM Mode for Increased Light Load Efficiency
Selectable PWM Frequency from 4 Preset Values
Integrated MOSFET Drivers
Integrated Bootstrap Forward P‐CH MOSFET
Adjustable Integrated Soft‐Start and Soft‐Stop
Selectable Forced PWM or Automatic PFM/PWM Mode
Power Good Monitoring
70% Under‐Voltage Protection
125% Over‐Voltage Protection
Using Sense Low‐Side MOSFET’s RDS(ON) adjustable
Current‐Limit Protection
Over‐Temperature Protection
Auto Rework from Protection Mode
TDFN‐10 3x3 Package
Lead Free and Green Devices Available (RoHS Compliant)
Applications
Notebook
Table PC
Hand‐Held Portable
AIO PC
LCD Monitor / TV
Battery Charger
ADSL Modem
Telecom / Networking Equipment
August 20, 2014 Techcode Semiconductor Limited www.techcodesemi.com
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T echcode®
High-Performance
PWM
Controller
Pin Assignments
DATASHEET
TD9000
TDFN3x3
PIN NO.
1
2
3
4
5
6
7
8
9
10
Exposed Pad
GND and Thermal Pad (connected to GND plane for better heat dissipation)
NAME
FUNCTION
POK
OCSET
EN
FB
RF
LGATE
VCC
PHASE
UGATE
BOOT
GND
Power Good Output. POK is an open drain output used to indicate the status of the output voltage.
Connect the POK in to +5V through a pull‐high resistor.
Current‐Limit Threshold Setting Pin. There is an internal source current 10 uA through a resistor from OCSET
pin to GND. This pin is used to monitor the voltage drop across the Drain and Source of the low‐side MOSFET
for current‐limit.
Enable Pin of The PWM Controller. When the EN is above enable logic level, the Device is workable. When
the EN is below shutdown logic level, the device is in shutdown and only low leakage current is taken from
VCC and VIN.
Output Voltage Feedback Pin. This pin is connected to the resistive divider that set the desired output
voltage. The POK, UVP, and OVP circuits detect this signal to report output voltage status.
This Pin is Allowed to Adjust The Switching Frequency. Connect a resistor RRF to set switching frequency
as show in Table1. The pin also controls forced PWM mode or PFM/PWM auto skip mode selection. When
RF pin is pulled down to GND, the device is in automatic PFM/PWM Mode. When RF pin is pulled high to
POK, the device is in force PWM mode.
Output of The Low‐side MOSFET Driver. Connect this pin to Gate of the low‐side
MOSFET. Swings from GND to VCC.
Supply Voltage Input Pin for Control Circuitry. Connect +5V from the VCC pin to the GND pin. Decoupling
at least 1u F of a MLCC capacitor from the VCC pin to the GND pin.
Junction Point of The High‐side MOSFET Source, Output Filter Inductor and The Low‐side
MOSFET Drain. Connect this pin to the Source of the high‐side MOSFET. PHASE serves as the lower supply
rail for the UGATE high‐side gate driver.
Output of The High‐side MOSFET Driver. Connect this pin to Gate of the high‐side MOSFET.
Supply Input for The UGATE Gate Driver and An Internal Level‐shift Circuit. Connect to an external
capacitor to create a boosted voltage suitable to drive a logic‐level N‐channel
MOSFET.
Signal Ground for The IC
August 20, 2014 Techcode Semiconductor Limited www.techcodesemi.com
2
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T echcode®
High-Performance
PWM
Controller
Ordering Information
DATASHEET
TD9000
TD9000 □ □
Circuit Type Packing:
Blank：Tube
R:Type and Reel
Package
Q:TDFN
Functional Block Diagram
Functional Block Diagram of TD9000
August 20, 2014 Techcode Semiconductor Limited www.techcodesemi.com
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