Texas Instruments TPS62040DGQ, TPS62040DRC, TPS62042DGQ, TPS62042DRC, TPS62043DGQ Schematic [ru]

	TPS62040
	TPS62042, TPS62043
www.ti.com	TPS62044, TPS62046
	SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER

FEATURES

DUp to 95% Conversion Efficiency

DTypical Quiescent Current: 18 A

DLoad Current: 1.2 A

DOperating Input Voltage Range: 2.5 V to 6.0 V

DSwitching Frequency: 1.25 MHz

DAdjustable and Fixed Output Voltage

DPower Save Mode Operation at Light load Currents

D100% Duty Cycle for Lowest Dropout

DInternal Softstart

DDynamic Output Voltage Positioning

DThermal Shutdown

DShort-Circuit Protection

D10 Pin MSOP PowerPad™ Package

D10 Pin QFN 3 X 3 mm Package

APPLICATIONS

DPDA, Pocket PC and Smart Phones

DUSB Powered Modems

DCPUs and DSPs

DPC Cards and Notebooks

DxDSL Applications

DStandard 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

VI		TPS6204x			L1		VO
2.5 V to 6 V	2		SW	8	6.2	H	0.7 V to VI /1.2 A
		VIN
C1	3	VIN	SW	7			C2
	1	EN	FB	5
22 F							22 F
	6	MODE	PGND 10
	4	GND	PGND	9

					EFFICIENCY
						vs
				LOAD CURRENT
	100		VO = 1.8 V
	95
	90		VI = 2.7 V
	85		VI = 3.6 V
− %	80		VI = 5 V
	75
Efficiency
	70
	65				MODE = Low
	60
	55
	50						VI = 3.6 V
	45
							MODE = High
	40	0	0.01	0.1	1	10	100	1 k	10 k
				IL − Load Current − mA

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	Copyright ♥ 2003 − 2005, Texas Instruments Incorporated
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.

TPS62040
TPS62042, TPS62043
TPS62044, TPS62046	www.ti.com
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

	TA	VOLTAGE OPTIONS	PACKAGE		PACKAGE MARKING
			MSOP(1)	QFN(2)	MSOP	QFN
		Adjustable	TPS62040DGQ	TPS62040DRC	BBI	BBO
		1.5 V	TPS62042DGQ	TPS62042DRC	BBL	BBS
°	°	1.6 V	TPS62043DGQ	TPS62043DRC	BBM	BBT
−40 C to 85 C
		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.

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range unless otherwise noted(1)

	UNITS
Supply voltage VIN (2)	−0.3 V to 7 V
Voltages on EN, MODE, FB, SW(2)	−0.3 V to V +0.3 V
	CC
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.

PACKAGE DISSIPATION RATINGS

PACKAGE		RQ (1)	TA ≤ 25°C	TA = 70°C	TA = 85°C
		JA	POWER RATING	POWER RATING	POWER RATING
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	ΘJA	is based on a soldered PowerPAD using thermal vias.

RECOMMENDED OPERATING CONDITIONS

		MIN	TYP MAX	UNIT
VI	Supply voltage	2.5	6.0	V
VO	Output voltage range for adjustable output voltage version	0.7	VI	V
IO	Output current		1.2	A
L	Inductor(1)		6.2	H
C	Input capacitor(1)		22	F
I
C	Output capacitor(1)		22	F
O
TA	Operating ambient temperature	−40	85	°C
TJ	Operating junction temperature	−40	125	°C

(1) Refer to application section for further information

2

						TPS62040
				TPS62042, TPS62043
www.ti.com				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)(1)
SUPPLY CURRENT
	PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
VI	Input voltage range			2.5		6.0	V
I(Q)	Operating quiescent current		IO = 0 mA, device is not switching		18	35	µA
ISD	Shutdown supply current		EN = GND		0.1	1	µA
VUVLO	Under−voltage lockout threshold			1.5		2.3	V
ENABLE AND MODE
VEN	EN high level input voltage			1.4			V
VEN	EN low level input voltage					0.4	V
IEN	EN input bias current		EN = GND or VIN		0.01	1.0	µA
V(MODE)	MODE high level input voltage			1.4			V
V(MODE)	MODE low level input voltage					0.4	V
I(MODE)	MODE input bias current		MODE = GND or VIN		0.01	1.0	µA
POWER SWITCH
rDS(ON)	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
Ilkg(P)	P-channel leakage current		VDS = 6.0 V			1	µA
rDS(ON)	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
IIkg(N)	N-channel leakage current		VDS = 6.0 V			1	µA
IL	P-channel current limit		2.5 V < VI< 6.0 V	1.5	1.85	2.2	A
	Thermal shutdown				150		°C
OSCILLATOR
fS	Oscillator frequency		VFB = 0.5 V	1	1.25	1.5	MHz
			VFB = 0 V		625		kHz
OUTPUT
VO	Adjustable output voltage range	TPS62040		0.7		VIN	V
Vref	Reference voltage				0.5		V
VFB	Feedback voltage	TPS62040	VI = 2.5 V to 6.0 V; IO= 0 mA	0%		3%
		Adjustable	VI = 2.5 V to 6.0 V; 0 mA ≤ IO ≤ 1.2 A	−3%		3%
		TPS62042	VI = 2.5 V to 6.0 V; IO = 0 mA	0%		3%
		1.5V	VI = 2.5 V to 6.0 V; 0 mA ≤ IO ≤ 1.2 A	−3%		3%
		TPS62043	VI = 2.5 V to 6.0 V; IO = 0 mA	0%		3%
VO	Fixed output voltage	1.6V	VI = 2.5 V to 6.0 V; 0 mA ≤ IO ≤ 1.2 A	−3%		3%
		TPS62044	VI = 2.5 V to 6.0 V; IO = 0 mA	0%		3%
		1.8V	VI = 2.5 V to 6.0 V; 0 mA ≤ IO ≤ 1.2 A	−3%		3%
		TPS62046	VI = 3.6 V to 6.0 V; IO = 0 mA	0%		3%
		3.3V	VI = 3.6 V to 6.0 V; 0 mA ≤ IO ≤ 1.2 A	−3%		3%
	Line regulation(1)		VI = VO + 0.5 V (min. 2.5 V) to 6.0 V,		0		%/V
			IO = 10 mA
	Load regulation(1)		I = 10 mA to 1200 mA		0		%/mA
			O
IIkg(SW)	Leakage current into SW pin		VI>VO, 0 V ≤ Vsw ≤ VI		0.1	1	µA
	Reverse leakage current into pin SW		VI = open; EN = GND; VSW = 6.0 V		0.1	1	µA
f	Short circuit switching frequency		VFB = 0 V		625		kHz

(1) The line and load regulations are digitally controlled to assure an output voltage accuracy of ±3%.

3

TPS62040
TPS62042, TPS62043
TPS62044, TPS62046	www.ti.com
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
PIN ASSIGNMENTS
DGQ PACKAGE	DRC PACKAGE
(TOP VIEW)	(TOP VIEW)

EN					1		10				PGND
VIN					2		9				PGND
VIN					3		8				SW
GND					4		7				SW
FB					5		6				MODE
NOTE:
		The PowerPAD must be connected to GND.

EN	1	10	PGND
VIN	2	9	PGND
VIN	3	8	SW
GND	4	7	SW
FB	5	6	MODE

				Terminal Functions
	TERMINAL		I/O	DESCRIPTION
	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
				not be left floating and must be terminated.
	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
				an external resistor divider is connected to this pin. The internal voltage divider is disabled 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
				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.
	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

4

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FUNCTIONAL BLOCK DIAGRAM

VIN
VIN	Undervoltage
	Lockout
	Bias supply

EN

V	Vcomp
	I

Soft

Start

1.25 MHz

Oscillator

TPS62040 TPS62042, TPS62043 TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

Current limit Comparator

+

− Ref

+	Channel−P PowerMOSFET
	SkipComparator
−	Ref
MODE

	Comparator		S
					Driver
	+		R
				Control Logic	Shoot−thru
Saw Tooth
	−				Logic
Generator
			Comp High
			Comp Low
			Comp Low 2
Comp High				LoadComparator
−
Gm	Compensation		R1		+
+			R2
Comp Low		+			−
Comp Low 2
		−
	Vref = 0.5 V

SW

SW

Power MOSFET

N−Channel

MODE

GND

FB

PGND PGND

For the Adjustable Version the FB Pin Is

Directly Connected to the Gm Amplifier

5

TPS62040
TPS62042, TPS62043
TPS62044, TPS62046				www.ti.com
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
		TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
				FIGURE
η	Efficiency		vs Load current	1, 2, 3
η	Efficiency		vs Input voltage	4
IQ	Quiescent current		vs Input voltage	5, 6
fs	Switching frequency		vs Input voltage	7
rDS(on)	P-Channel rDS(on)		vs Input voltage	8
rDS(on)	N-Channel rectifier rDS(on)		vs Input voltage	9
	Load transient response			10
	PWM operation			11
	Power save mode			12
	Start-up			13

					EFFICIENCY
						vs
				LOAD CURRENT
	100		VO = 3.3 V
	95
	90		VI = 3.6 V
	85		MODE = Low
	80						VI = 5 V
− %							MODE = Low			− %
	75
Efficiency	70						VI = 3.6 V			Efficiency
	65						MODE = High
	60						VI = 5 V
	55						MODE = High
	50
	45
	40	0	0.01	0.1	1	10	100	1 k	10 k
				IL − Load Current − mA

Figure 1

				EFFICIENCY
					vs
				LOAD CURRENT
100		VO = 1.8 V
95
		VI = 2.7 V
90
85		VI = 3.6 V
80		VI = 5 V
75
70				MODE = Low
65
						VI = 3.6 V
60
						MODE = High
55
50
45
40	0	0.01	0.1	1	10	100	1 k	10 k
			IL − Load Current − mA

Figure 2

6

																	TPS62040
															TPS62042, TPS62043
	www.ti.com														TPS62044, TPS62046
													SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
					EFFICIENCY									EFFICIENCY
						vs									vs
					LOAD CURRENT								INPUT VOLTAGE
	100		VO = 1.5 V								100	VO = 1.8 V
	95
												MODE = Low
	90		VI = 2.7 V								95
	85		VI = 3.6 V												IL = 500 mA
	80										90
− %										− %
	75		VI = 5 V
Efficiency	70									Efficiency	85	IL = 1000 mA
	65														IL = 1 mA
	60										80
	55
	50										75
	45
	40	0	0.01	0.1	1	10	100	1 k	10 k		70
											2.5	3	3.5	4	4.5	5	5.5	6
				IL − Load Current − mA									VI − Input Voltage − V
					Figure 3									Figure 4
				QUIESCENT CURRENT									QUIESCENT CURRENT
						vs									vs
					INPUT VOLTAGE									INPUT VOLTAGE
	23										7.5

MODE = Low

MODE = High

	21				TA = 85°C							7
A	19				TA = 25°C						mA	6.5				TA = 25°C
−	17										−	6
Current											Current
	15				TA = −40°C							5.5
Quisecent	13										Quisecent	5
	11											4.5
	9											4
	7											3.5
	5											3
	2.4	2.8	3.2	3.6	4	4.4	4.8	5.2	5.6	6		2.5	3	3.5	4	4.5	5	5.5	6
				VI − Input Voltage − V										VI − Input Voltage − V
				Figure 5											Figure 6

7

TPS62040
TPS62042, TPS62043
TPS62044, TPS62046																			www.ti.com
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
			SWITCHING FREQUENCY												P-CHANNEL rDS(on)
					vs											vs
				INPUT VOLTAGE											INPUT VOLTAGE
	1.23											0.180
	1.23						TA = 85°C					0.170
MHz	1.22							TA = 25°C			−Ω	0.160
	1.22													TA = 85°C
												0.150
−											DS(on)
	1.21											0.140				TA = 25°C
SwitchingFrequency	1.21						°				P−Channel r	0.130
	1.20				TA = −40 C
	1.20											0.120
	1.19											0.110
f −														TA = −40°C
	1.19											0.100
	1.18											0.090
	1.18											0.080
	2.5	2.9	3.3	3.7	4.1	4.5	4.9	5.3	5.7	6		2.5	2.9	3.3	3.7	4.1	4.5	4.9	5.3	5.7	6
				VI − Input Voltage − V											VI − Input Voltage − V
				Figure 7											Figure 8

N-CHANNEL RECTIFIER rDS(on) vs

INPUT VOLTAGE

	0.150
	0.140
Ω	0.130
−
DS(on)	0.120		TA = 85°C
	0.110			TA = 25°C
r
Rectifier	0.100
	0.090
N-Channel
	0.080
	0.070
		TA = −40°C
	0.060
	0.050
	2.5	2.9	3.3	3.7	4.1	4.5	4.9	5.3	5.7	6
				VI − Input Voltage − V

Figure 9

8

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LOAD TRANSIENT RESPONSE

VI = 3.6 V

VO = 1.8 V

PWM/PFM Operation

V	100mV/div
O
O to 1.15 A
I	150mA

50 s/div

Figure 10

POWER SAVE MODE

V	V/div5
SW
V	mV/div
O
	20
I	mA/div
L
	500

2.5 s/div

Figure 12

V	V/div5
SW
V	mV/div
O
	20
I	mA/div
L
	500

Enable	2 V/div
V	V/div1
O
I	mA/div
IN
	200

TPS62040 TPS62042, TPS62043 TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

PWM OPERATION

500 ns/div

Figure 11

START-UP

VI = 3.6 V

VO = 1.8 V

IO = 1.1 A

200 s/div

Figure 13

9