Texas Instruments TPS62040DGQ, TPS62040DRC, TPS62042DGQ, TPS62042DRC, TPS62043DGQ Schematic [ru]
...
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SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER
TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
FEATURES
D Up to 95% Conversion Efficiency
D Typical Quiescent Current: 18 µA
D Load Current: 1.2 A
D Operating Input Voltage Range: 2.5 V to 6.0 V
D Switching Frequency: 1.25 MHz
D Adjustable and Fixed Output Voltage
D Power Save Mode Operation at Light load
Currents
D 100% Duty Cycle for Lowest Dropout
D Internal Softstart
D Dynamic Output Voltage Positioning
D Thermal Shutdown
D Short-Circuit Protection
D 10 Pin MSOP PowerPad™ Package
D 10 Pin QFN 3 X 3 mm Package
APPLICATIONS
D PDA, Pocket PC and Smart Phones
D USB Powered Modems
D CPUs and DSPs
D PC Cards and Notebooks
D xDSL Applications
D Standard 5-V to 3.3-V Conversion
DESCRIPTION
The TPS6204x family of devices are high efficiency
synchronous step-down dc-dc converters optimized for
battery powered portable applications. The devices are
ideal for portable applications powered by a single Li-Ion
battery cell or by 3-cell NiMH/NiCd batteries. With an
output voltage range from 6.0 V down to 0.7 V, the devices
support low voltage DSPs and processors in PDAs,
pocket PCs, as well as notebooks and subnotebook
computers. The TPS6204x operates at a fixed switching
frequency of 1.25 MHz and enters the power save mode
operation at light load currents to maintain high efficiency
over the entire load current range. For low noise
applications, the devices can be forced into fixed
frequency PWM mode by pulling the MODE pin high. The
TPS6204x supports up to 1.2-A load current.
Typical Application Circuit 1.2-A Output Current
2
3
1
6
4
VIN
VIN
EN
MODE
GND
TPS6204x
PGND
PGND
SW
SW
FB
L1
6.2 µH
8
7
5
10
9
0.7 V to V
V
I
2.5 V to 6 V
C1
22 µF
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
V
C2
22 µF
O
/1.2 A
I
EFFICIENCY
vs
100
VO = 1.8 V
95
VI = 2.7 V
90
VI = 3.6 V
85
80
VI = 5 V
75
70
65
Efficiency − %
60
55
50
45
40
0 0.01 0.1 1 10 100 1 k 10 k
Copyright © 2003 − 2005, Texas Instruments Incorporated
LOAD CURRENT
MODE = Low
VI = 3.6 V
MODE = High
IL − Load Current − mA
TPS62040
40 C to 85 C
TPS62042, TPS62043
TPS62044, TPS62046
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during
storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
T
A
VOLTAGE OPTIONS
MSOP
Adjustable TPS62040DGQ TPS62040DRC BBI BBO
1.5 V TPS62042DGQ TPS62042DRC BBL BBS
−40°C to 85°C
1.6 V TPS62043DGQ TPS62043DRC BBM BBT
1.8 V TPS62044DGQ TPS62044DRC BBN BBU
3.3 V TPS62046DGQ TPS62046DRC BBQ BBW
(1)
The DGQ package is available in tape and reel. Add R suffix (DGQR) to order quantities of 2500 parts per reel.
(2)
The DRC package is available in tape and reel. Add R suffix (DRCR) to order quantities of 3000 parts per reel.
PACKAGE PACKAGE MARKING
(1)
QFN
(2)
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MSOP QFN
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted
Supply voltage VIN
Voltages on EN, MODE, FB, SW
(2)
(2)
Continuous power dissipation See Dissipation Rating Table
Operating junction temperature range −40°C to 150°C
Storage temperature range −65°C to 150°C
Lead temperature (soldering, 10 sec) 260°C
(1)
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-rated conditions for extended periods may affect device reliability.
(2)
All voltage values are with respect to network ground terminal.
(1)
UNITS
−0.3 V to 7 V
−0.3 V to VCC +0.3 V
PACKAGE DISSIPATION RATINGS
PACKAGE R
MSOP 60°C/W 1.67 W 917 mW 667 mW
QFN 48.7°C/W 2.05 W 1.13 W 821 mW
(1)
The thermal resistance, R
(1)
Q
JA
is based on a soldered PowerPAD using thermal vias.
Θ
JA
TA ≤ 25°C
POWER RATING
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
RECOMMENDED OPERATING CONDITIONS
MIN TYP MAX UNIT
V
Supply voltage 2.5 6.0 V
I
V
Output voltage range for adjustable output voltage version 0.7 V
O
I
Output current 1.2 A
O
L Inductor
C
I
C
O
T
A
T
J
(1)
Refer to application section for further information
(1)
Input capacitor
Output capacitor
(1)
(1)
Operating ambient temperature −40 85 °C
Operating junction temperature −40 125 °C
6.2 µH
22 µF
22 µF
I
V
2
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TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
ELECTRICAL CHARACTERISTICS
VI = 3.6 V, VO = 1.8 V, IO = 600 mA, EN = VIN, TA = −40°C to 85°C, typical values are at TA = 25°C (unless otherwise noted)
SUPPLY CURRENT
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
I
I
(Q)
I
SD
V
UVLO
ENABLE AND MODE
V
EN
V
EN
I
EN
V
(MODE)
V
(MODE)
I
(MODE)
POWER SWITCH
r
DS(ON)
I
lkg(P)
r
DS(ON)
I
Ikg(N)
I
L
OSCILLATOR
f
S
OUTPUT
V
O
V
ref
V
FB
V
O
I
Ikg(SW)
f Short circuit switching frequency V
(1)
The line and load regulations are digitally controlled to assure an output voltage accuracy of ±3%.
Input voltage range 2.5 6.0 V
Operating quiescent current IO = 0 mA, device is not switching 18 35 µA
Shutdown supply current EN = GND 0.1 1 µA
Under−voltage lockout threshold 1.5 2.3 V
EN high level input voltage 1.4 V
EN low level input voltage 0.4 V
EN input bias current EN = GND or VIN 0.01 1.0 µA
MODE high level input voltage 1.4 V
MODE low level input voltage 0.4 V
MODE input bias current MODE = GND or VIN 0.01 1.0 µA
P-channel MOSFET on−resistance VI = VGS = 3.6 V 115 210 mΩ
P-channel MOSFET on−resistance VI = VGS = 2.5 V 145 270 mΩ
P-channel leakage current VDS = 6.0 V 1 µA
N-channel MOSFET on−resistance VI = VGS = 3.6 V 85 200 mΩ
N-channel MOSFET on−resistance VI = VGS = 2.5 V 115 280 mΩ
N-channel leakage current VDS = 6.0 V 1 µA
P-channel current limit 2.5 V < VI< 6.0 V 1.5 1.85 2.2 A
Thermal shutdown 150 °C
V
= 0.5 V 1 1.25 1.5 MHz
Oscillator frequency
FB
V
= 0 V 625 kHz
FB
Adjustable output voltage range TPS62040 0.7 V
Reference voltage 0.5 V
Feedback voltage
Fixed output voltage
Line regulation
Load regulation
(1)
(1)
TPS62040
Adjustable
TPS62042
1.5V
TPS62043
1.6V
TPS62044
1.8V
TPS62046
3.3V
VI = 2.5 V to 6.0 V; IO= 0 mA
VI = 2.5 V to 6.0 V; 0 mA ≤ I
VI = 2.5 V to 6.0 V; I
VI = 2.5 V to 6.0 V; 0 mA ≤ I
VI = 2.5 V to 6.0 V; I
VI = 2.5 V to 6.0 V; 0 mA ≤ I
VI = 2.5 V to 6.0 V; I
VI = 2.5 V to 6.0 V; 0 mA ≤ I
VI = 3.6 V to 6.0 V; I
VI = 3.6 V to 6.0 V; 0 mA ≤ I
VI = VO + 0.5 V (min. 2.5 V) to 6.0 V,
IO = 10 mA
IO = 10 mA to 1200 mA 0 %/mA
Leakage current into SW pin VI>VO, 0 V ≤ Vsw ≤ V
Reverse leakage current into pin SW V
= open; EN = GND; V
I
= 0 V 625 kHz
FB
≤ 1.2 A
O
= 0 mA
O
O
O
O
≤ 1.2 A
O
= 0 mA
≤ 1.2 A
O
= 0 mA
≤ 1.2 A
O
= 0 mA
≤ 1.2 A
O
I
= 6.0 V 0.1 1 µA
SW
0%
−3%
0%
−3%
0%
−3%
0%
−3%
0%
−3%
0.1 1 µA
(1)
V
IN
3%
3%
3%
3%
3%
3%
3%
3%
3%
3%
0 %/V
3
TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
PIN ASSIGNMENTS
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DGQ PACKAGE
(TOP VIEW)
EN
VIN
VIN
GND
FB
NOTE:The PowerPAD must be connected to GND.
1
2
3
4
5
10
9
8
7
6
PGND
PGND
SW
SW
MODE
GND
EN
VIN
VIN
FB
DRC PACKAGE
(TOP VIEW)
1
2
3
4
5
10
PGND
9
PGND
8
SW
7
SW
6
MODE
Terminal Functions
TERMINAL
NAME NO.
EN 1 I Enable. Pulling EN to ground forces the device into shutdown mode. Pulling EN to VI enables the device. EN should
VIN 2,3 I Supply voltage input
GND 4 Analog ground
FB 5 I Feedback pin. Connect FB directly to the output if the fixed output voltage version is used. For the adjustable version
MODE 6 I Pulling the MODE pin high allows the device to be forced into fixed frequency operation. Pulling the MODE pin to low
SW 7,8 I/O This is the switch pin of the converter and is connected to the drain of the internal power MOSFETs
PGND 9,10 Power ground
I/O DESCRIPTION
not be left floating and must be terminated.
an external resistor divider is connected to this pin. The internal voltage divider is disabled for the adjustable version.
enables the power save mode where the device operates in fixed frequency PWM mode at high load currents and
in PFM mode (pulse frequency modulation) at light load currents.
4
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FUNCTIONAL BLOCK DIAGRAM
VIN
VIN
Undervoltage
Lockout
Bias supply
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
Current limit Comparator
+
−
Ref
TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
EN
V
I
Comp High
Comp Low
Comp Low 2
Vcomp
Saw Tooth
Generator
−
Gm
+
Compensation
Vref = 0.5 V
GNDMODE
Soft
Start
1.25 MHz
Oscillator
Comparator
+
−
+
−
S
R
Comp High
Comp Low
Comp Low 2
R1
R2
+
SkipComparator
−
MODE
Control Logic
FB PGND
For the Adjustable Version the FB Pin Is
Directly Connected to the Gm Amplifier
Shoot−thru
LoadComparator
+
−
Ref
Driver
Logic
P−Channel
Power MOSFET
SW
SW
N−Channel
Power MOSFET
PGND
5
TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
η Efficiency vs Load current 1, 2, 3
η Efficiency vs Input voltage 4
I
Q
f
s
r
DS(on)
r
DS(on)
Quiescent current vs Input voltage 5, 6
Switching frequency vs Input voltage 7
P-Channel r
N-Channel rectifier r
Load transient response 10
PWM operation 11
Power save mode 12
Start-up 13
DS(on)
) vs Input voltage 9
DS(on
vs Input voltage 8
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FIGURE
100
VO = 3.3 V
95
90
MODE = Low
85
80
75
70
65
Efficiency − %
60
55
50
45
40
0 0.01 0.1 1
EFFICIENCY
LOAD CURRENT
VI = 3.6 V
IL − Load Current − mA
Figure 1
vs
VI = 5 V
MODE = Low
VI = 3.6 V
MODE = High
VI = 5 V
MODE = High
10 100 1 k 10 k
EFFICIENCY
vs
LOAD CURRENT
Efficiency − %
100
95
90
85
80
75
70
65
60
55
50
45
40
VO = 1.8 V
VI = 2.7 V
VI = 3.6 V
VI = 5 V
MODE = Low
VI = 3.6 V
MODE = High
0 0.01 0.1 1 10 100 1 k 10 k
IL − Load Current − mA
Figure 2
6
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TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
EFFICIENCY
vs
LOAD CURRENT
100
VO = 1.5 V
95
90
85
80
75
70
65
Efficiency − %
60
55
50
45
40
0 0.01 0.1 1 10 100 1 k 10 k
VI = 2.7 V
VI = 3.6 V
VI = 5 V
IL − Load Current − mA
Figure 3
QUIESCENT CURRENT
vs
INPUT VOLTAGE
23
MODE = Low
21
TA = 85°C
EFFICIENCY
vs
INPUT VOLTAGE
100
VO = 1.8 V
MODE = Low
95
IL = 500 mA
90
85
IL = 1000 mA
Efficiency − %
80
75
70
2.5 3 3.5 4 4.5 5 5.5 6
VI − Input Voltage − V
IL = 1 mA
Figure 4
QUIESCENT CURRENT
vs
INPUT VOLTAGE
7.5
MODE = High
7
19
Aµ
17
15
13
11
Quisecent Current −
9
7
5
2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6
TA = 25°C
TA = −40°C
VI − Input Voltage − V
Figure 5
6.5
mA
6
5.5
5
4.5
Quisecent Current −
4
3.5
3
2.5 3 3.5 4 4.5 5 5.5 6
TA = 25°C
VI − Input Voltage − V
Figure 6
7
TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
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SWITCHING FREQUENCY
vs
INPUT VOLTAGE
1.23
1.23
1.22
1.22
1.21
1.21
1.20
1.20
1.19
f − Switching Frequency − MHz
1.19
1.18
1.18
2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 5.7 6
VI − Input Voltage − V
TA = 85°C
TA = −40°C
Figure 7
0.150
TA = 25°C
P−Channel r
N-CHANNEL RECTIFIER r
vs
INPUT VOLTAGE
P-CHANNEL r
DS(on)
vs
INPUT VOLTAGE
0.180
0.170
0.160
ΩDS(on) −
0.150
0.140
0.130
0.120
0.110
0.100
0.090
0.080
2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 5.7 6
TA = 85°C
TA = 25°C
TA = −40°C
VI − Input Voltage − V
Figure 8
DS(on)
0.140
Ω
0.130
0.120
DS(on) −
0.110
0.100
0.090
0.080
N-Channel Rectifier r
0.070
0.060
0.050
TA = −40°C
2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 5.7 6
TA = 85°C
TA = 25°C
VI − Input Voltage − V
Figure 9
8
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TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
V
SW
VI = 3.6 V
VO = 1.8 V
PWM/PFM Operation
O
V
100 mV/div150mA to 1.15 A
O
I
5 V/div
LOAD TRANSIENT RESPONSE
50 µs/div
Figure 10
POWER SAVE MODE
SW
V
5 V/div
O
V
20 mV/div
L
I
500 mA/div
2 V/div
Enable
PWM OPERATION
500 ns/div
Figure 11
START-UP
O
V
20 mV/div
L
I
500 mA/div
2.5 µs/div
Figure 12
O
V
1 V/div
IN
I
200 mA/div
VI = 3.6 V
VO = 1.8 V
IO = 1.1 A
200 µs/div
Figure 13
9
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