T
echcode
®
High-Performance PWM Controller
Features
DATASHEET
TD1730
General Description
The TD1730 is a single‐phase, constant‐on‐time,
synchronous PWM controller, which drives N‐channel
MOSFETs. The TD1730 steps down high voltage to
generate low‐voltage chipset or RAM supplies in notebook
computers.
The TD1730 provides excellent transient response and
accurate DC voltage output in either PFM or PWM Mode. In
Pulse Frequency Mode (PFM), the TD1730 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 TD1730 is equipped with accurate positive current‐ limit,
output under‐voltage, and output over‐voltage
protections, perfect for NB applications. The Power‐On‐
Reset function monitors the voltage on VCC to prevent
wrong operation during power‐on. The TD1730 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 TD1730 is available in 10pin TDFN 3x3 package.
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 +32V
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
Adjustable Current‐Limit Protection
Using Sense Low‐Side MOSFET’s R
DS(ON)
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
December, 20, 2011
Techcode Semiconductor Limited
www.techcodesemi.com
1
T
echcode
®
High-Performance PWM Controller
DATASHEET
TD1730
Pin Assignments
GND and Thermal Pad (connected to GND plane for better heat dissipation)
PIN
NO.
TDFN3x3
TDFN2x2
FUNCTION
NAME
1
2
3
4
1
2
3
4
5
‐
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 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.
EN 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
FB 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
RF 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.
POK
Output of The Low‐side MOSFET Driver. Connect this pin to Gate of the low‐side
LGATE MOSFET. Swings from GND to VCC.
Supply Voltage Input Pin for Control Circuitry. Connect +5V from the VCC pin to the GND pin.
VCC
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
PHASE
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.
UGATE
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
BOOT
capacitor
to
create
a
boosted
voltage
suitable
to
drive
a
logic‐level N‐channel
MOSFET.
GND
Signal Ground for The IC
6
7
8
9
10
Exposed
Pad
6
7
8
9
10
5
December, 20, 2011
Techcode Semiconductor Limited
www.techcodesemi.com
2
T
echcode
®
High-Performance PWM Controller
TD1730
□
□
DATASHEET
TD1730
Ordering Information
Circuit Type
Packing:
Blank：Tube
R:Type and Reel
Package
Q:TDFN
Functional Block Diagram
Functional Block Diagram of TD1730
December, 20, 2011
Techcode Semiconductor Limited
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T
echcode
®
High-Performance PWM Controller
Symbol
V
CC
V
BOOT‐GND
V
BOOT
Parameter
VCC Supply Voltage (VCC to GND)
BOOT Supply Voltage (BOOT to GND)
BOOT Supply Voltage (BOOT to PHASE)
All Other Pins (POK, OCSET, EN, FB, and RF to GND)
UGATE Voltage (UGATE to PHASE)
Pulse Width <400ns
Pulse Width>400ns
LGATE Voltage (LGATE to GND)
PHASE Voltage (PHASE to GND)
V
PHASE
T
J
T
STG
T
SDR
Pulse Width <400ns
Pulse Width>400ns
Pulse Width <400ns
Pulse Width>400ns
DATASHEET
TD1730
Absolute Maximum Ratings
Rating
‐0.3 ~ 7
‐0.3 ~ 35
‐0.3 ~ 7
‐0.3 ~ V
CC
+0.3
‐5 ~ V
BOOT
+0.3
‐0.3 ~ V
BOOT
+0.3
‐5 ~ V
CC
+0.3
‐0.3 ~ V
CC
+0.3
‐5 ~ 35
‐1 ~ 32
150
‐65 ~ 150
260
Unit
V
V
V
V
V
V
V
C
o
C
o
C
o
Maximum Junction Temperature
Storage Temperature
Maximum Soldering Temperature, 10 Seconds
Note: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability
Recommended Operating Conditions
Symbol
V
IN
VCC
V
OUT
I
OUT
T
A
T
J
Parameter
Converter Input Voltage
VCC Supply Voltage
Converter Output Voltage
Converter Output Current
Ambient Temperature
Junction Temperature
Range
1.8 ~32
4.5 ~ 5.5
0.7 ~ 5.5
~ 25
‐40 ~ 85
‐40 ~ 125
Unit
V
V
V
A
o
C
o
C
Note: Refer to the typical application circuit.
Thermal Characteristics
Symbol
θ
JA
Parameter
Thermal Resistance‐Junction to Ambient
3mmx3mm TDFN‐10
Typical Value
Unit
°C/W
55
Note:
θ
JA
is measured with the component mounted on a high effective the thermal conductivity test board in free air. The exposed pad of package is
soldered directly on the PCB.
December, 20, 2011
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T
echcode
®
Symbol
Parameter
Test Conditions
VOUT AND VFB VOLTAGE
V
OUT
V
REF
Output Voltage
Reference Voltage
T
A
= 25
o
C
Regulation Accuracy
I
FB
T
DIS
FB Input Bias Current
V
OUT
Discharge Time
T
A
= 0
o
C ~ 85
o
C
T
A
= -40
o
C ~ 85
o
C
FB = 0.7V
EN low to FB = 0V
SUPPLY CURRENT
I
VCC
I
VCC
SHDN
DATASHEET
High-Performance PWM Controller
Electrical Characteristics
TD1730
Min.
TD1730
Refer to the typical application circuit. These specifications apply over V
VCC
= 12V, T
A
= ‐40°C to 85°C, unless otherwise noted. Typical values are at T
A
= 25°C.
Unit
Typ.
Max.
Adjustable output range
0.7
-
-0.5
-0.8
-1.0
-
-
0.02
12
0.7
-
5.5
-
V
V
%
%
%
uA
-
ms
-
-
-
0.1
+0.5
+0.8
+1.0
VCC Input Bias Current
VCC Shutdown Current
VCC Current, PWM, EN = 5V, VFB = 0.735V, PHASE =
0 5V
EN = GND, VCC = 5V
SWITCHING FREQUENCY AND SUTY AND INTERNAL SOFT-START
R
RF
= 470k
R
RF
= 200k
, T
A
= 25
o
C, V
IN
=8V, V
OUT
=1.1V, I
OUT
=10A
, T
A
= 25
o
C, V
IN
=8V, V
OUT
=1.1V, I
OUT
=10A
, T
A
= 25
o
C, V
IN
=8V, V
OUT
=1.1V, I
OUT
=10A
, T
A
= 25
o
C, V
IN
=8V, V
OUT
=1.1V, I
OUT
=10A
-
-
250
0
520 uA
1
uA
115
140
155
185
80
135
165
185
215
110
450
1.0
155
180
215
245
140
550
1.3
ns
ns
ms
Ω
Ω
Ω
Ω
ns
-
ns
kHz
F
SW
Switching Frequency
R
RF
= 100k
R
RF
= 39k
T
ON(MIN)
T
OFF(MIN)
T
SS
Minimum On Time
Minimum Off Time
Internal Soft-Start Time
V
FB
= 0.65V, V
PHASE
= -0.1V, OCSET = OPEN
EN High to V
OUT
Regulation (95%)
GATE DRIVER
UGATE Pull-Up Resistance
UGATE Sink Resistance
LGATE Pull-Up Resistance
LGATE Sink Resistance
UGATE to LGATE Dead-Time
LGATE to UGATE Dead-Time
BOOT-UGATE = 0.5V
UGATE-PHASE = 0.5V
PVCC-LGATE = 0.5V
LGATE-GND = 0.5V
UGATE falling to LGATE rising
LGATE falling to UGATE rising
BOOTSTRAP SWITCH
350
0.7
-
-
-
-
-
-
1.5
0.7
1.0
0.5
20
20
3
1.8
2.2
1.2
-
V
F
I
R
Ron
Reverse Leakage
V
VCC
- V
BOOT-GND
, I
F
= 10mA
V
BOOT-GND
= 30V, V
PHASE
= 25V, V
VCC
= 5V
VCC POR THRESHOLD
-
-
0.5
-
0.8
0.5
V
uA
V
VCC
THR
Rising VSS POR Threshold
VCC POR Hysteresis
CONTROL INPUTS
Enable
EN Voltage Threshold
Shutdown
4.2
-
4.35
100
4.45
-
V
mV
1.8
-
-
-
0.5
-
V
V
December, 20, 2011
Techcode Semiconductor Limited
www.techcodesemi.com
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