Texas Instruments TPS62200DBV, TPS62201DBV, TPS62202DBV, TPS62203DBV, TPS62204DBV Schematic [ru]

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FEATURES

DESCRIPTION

APPLICATIONS

GND

4.7 µF

10 µH

10 µF

TPS62202

2.5 V − 6 V

1.8 V / 300 mA

100

0.010 0.100 1

10 100 1000

Efficiency − %

EFFICIENCY

LOAD CURRENT

−Load Current − mA

= 1.8 V

= 2.7 V

= 3.7 V

= 5 V

TPS62200 , , TPS62201

TPS62202 , TPS62203 , TPS62207

TPS62204 , TPS62205 , TPS62208

SLVS417E – MARCH 2002 – REVISED MAY 2006

HIGH-EFFICIENCY, SOT23

STEP-DOWN, DC-DC CONVERTER

• High Efficiency Synchronous Step-Down

The TPS6220x devices are a family of high-efficiency

Converter With up to 95% Efficiency

synchronous step-down converters ideally suited for

• 2.5-V to 6-V Input Voltage Range

portable systems powered by 1-cell Li-Ion or 3-cell

• Adjustable Output Voltage Range From 0.7 V

NiMH/NiCd batteries. The devices are also suitable

to V

to operate from a standard 3.3-V or 5-V voltage rail.

• Fixed Output Voltage Options Available

With an output voltage range of 6 V down to 0.7 V

• Up to 300 mA Output Current

and up to 300 mA output current, the devices are

ideal to power low voltage DSPs and processors

• 1-MHz Fixed Frequency PWM Operation

used in PDAs, pocket PCs, and smart phones.

• Highest Efficiency Over Wide Load Current

Under nominal load current, the devices operate with

Range Due to Power Save Mode

a fixed switching frequency of typically 1 MHz. At

• 15-µA Typical Quiescent Current

light load currents, the part enters the power save

mode operation; the switching frequency is reduced

• Soft Start

and the quiescent current is typically only 15 µA;

• 100% Duty Cycle Low-Dropout Operation

therefore, it achieves the highest efficiency over the

• Dynamic Output-Voltage Positioning

entire load current range. The TPS6220x needs only

three small external components. Together with the

• Available in a 5-Pin SOT23 Package

SOT23 package, a minimum system solution size is

achieved. An advanced fast response voltage mode

control scheme achieves superior line and load

• PDAs and Pocket PC

regulation with small ceramic input and output

• Cellular Phones, Smart Phones

capacitors.

• Low Power DSP Supply

• Digital Cameras

• Portable Media Players

• Portable Equipment

Figure 1. Typical Application

(Fixed Output Voltage Version)

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.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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DBV PACKAGE

(TOP VIEW)

GND

TPS62200 , , TPS62201

TPS62202 , TPS62203 , TPS62207

TPS62204 , TPS62205 , TPS62208

SLVS417E – MARCH 2002 – REVISED MAY 2006

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be

more susceptible to damage because very small parametric changes could cause the device not to meet its published

specifications.

ORDERING INFORMATION

(1)

OUTPUT VOLTAGE SOT23 PACKAGE SYMBOL

Adjustable TPS62200DBV PHKI

1.2 V TPS62207DBV PJGI

1.5 V TPS62201DBV PHLI

1.6 V TPS62204DBV PHSI

-40°C to 85°C

1.8 V TPS62202DBV PHMI

1.875 V TPS62208DBV ALW

2.5 V TPS62205DBV PHTI

3.3 V TPS62203DBV PHNI

(1) The DBV package is available in tape and reel. Add R suffix (DBVR) to order quantities of 3000 parts.

Add T suffix (DBVT) to order quantities of 250 parts

Terminal Functions

TERMINAL

I/O DESCRIPTION

NAME NO.

This is the enable pin of the device. Pulling this pin to ground forces the device into shutdown mode. Pulling this

EN 3 I

pin to Vin enables the device. This pin must not be left floating and must be terminated.

This is the feedback pin of the device. Connect this pin directly to the output if the fixed output voltage version is

FB 4 I used. For the adjustable version an external resistor divider is connected to this pin. The internal voltage divider

is disabled for the adjustable version.

GND 2 Ground

SW 5 I/O Connect the inductor to this pin. This pin is the switch pin and is connected to the internal MOSFET switches.

1 I Supply voltage pin

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REF

Load Comparator

Skip Comparator

Current Limit Comparator

P-Channel

Power MOSFET

Driver

Shoot-Through

Logic

Control

Logic

Soft Start

1 MHz

Oscillator

Comparator

N-Channel

Power MOSFET

Comparator High

Comparator Low

Comparator Low 2

(COMP)

Sawtooth

Generator

Undervoltage

Lockout

Bias Supply

Comparator High

Comparator Low

Comparator Low 2

Compensation

REF

= 0.5 V

See Note

FB GND

DETAILED DESCRIPTION

OPERATION

TPS62200 , , TPS62201

TPS62202 , TPS62203 , TPS62207

TPS62204 , TPS62205 , TPS62208

SLVS417E – MARCH 2002 – REVISED MAY 2006

FUNCTIONAL BLOCK DIAGRAM

For the adjustable version (TPS62200) the internal feedback divider is disabled and the FB pin is directly connected

to the internal GM amplifier

The TPS6220x is a synchronous step-down converter operating with typically 1-MHz fixed frequency pulse width

modulation (PWM) at moderate to heavy load currents and in power save mode operating with pulse frequency

modulation (PFM) at light load currents.

During PWM operation the converter uses a unique fast response, voltage mode, controller scheme with input

voltage feed forward. This achieves good line and load regulation and allows the use of small ceramic input and

output capacitors. At the beginning of each clock cycle initiated by the clock signal (S), the P-channel MOSFET

switch is turned on, and the inductor current ramps up until the comparator trips and the control logic turns off

the switch. The current limit comparator also turns off the switch in case the current limit of the P-channel switch

is exceeded. Then the N-channel rectifier switch is turned on and the inductor current ramps down. The next

cycle is initiated by the clock signal again turning off the N-channel rectifier and turning on the P-channel switch.

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POWER SAVE MODE OPERATION

skip

v 66 mA )

Vin

160 W

peak

+ 66 mA )

Vin

80 W

PFM Mode at Light Load

Comparator High

Comparator Low

Comparator Low 2

PWM Mode at Medium to Full Load

1.6%

0.8%

TPS62200 , , TPS62201

TPS62202 , TPS62203 , TPS62207

TPS62204 , TPS62205 , TPS62208

SLVS417E – MARCH 2002 – REVISED MAY 2006

DETAILED DESCRIPTION (continued)

The GM amplifier and input voltage determines the rise time of the Sawtooth generator; therefore any change in

input voltage or output voltage directly controls the duty cycle of the converter. This gives a very good line and

load transient regulation.

As the load current decreases, the converter enters the power save mode operation. During power save mode,

the converter operates with reduced switching frequency in PFM mode and with a minimum quiescent current to

maintain high efficiency.

Two conditions allow the converter to enter the power save mode operation. One is when the converter detects

the discontinuous conduction mode. The other is when the peak switch current in the P-channel switch goes

below the skip current limit. The typical skip current limit can be calculated as

During the power save mode the output voltage is monitored with the comparator by the thresholds comp low

and comp high. As the output voltage falls below the comp low threshold set to typically 0.8% above Vout

nominal, the P-channel switch turns on. The P-channel switch is turned off as the peak switch current is

reached. The typical peak switch current can be calculated:

The N-channel rectifier is turned on and the inductor current ramps down. As the inductor current approaches

zero the N-channel rectifier is turned off and the P-channel switch is turned on again, starting the next pulse.

The converter continues these pulses until the comp high threshold (set to typically 1.6% above Vout nominal) is

reached. The converter enters a sleep mode, reducing the quiescent current to a minimum. The converter

wakes up again as the output voltage falls below the comp low threshold again. This control method reduces the

quiescent current typically to 15 µA and reduces the switching frequency to a minimum, thereby achieving the

high converter efficiency. Setting the skip current thresholds to typically 0.8% and 1.6% above the nominal

output voltage at light load current results in a dynamic output voltage achieving lower absolute voltage drops

during heavy load transient changes. This allows the converter to operate with a small output capacitor of just 10

µF and still have a low absolute voltage drop during heavy load transient changes. Refer to Figure 2 for detailed

operation of the power save mode.

Figure 2. Power Save Mode Thresholds and Dynamic Voltage Positioning

The converter enters the fixed frequency PWM mode again as soon as the output voltage falls below the comp

low 2 threshold.

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DYNAMIC VOLTAGE POSITIONING

SOFT START

LOW DROPOUT OPERATION 100% DUTY CYCLE

Vin

min

+ Vout

max

) Iout

max

(ON)

max

) R

Iout

max

= maximum output current plus inductor ripple current

(ON)

max

= maximum P-channel switch r

(ON)

= DC resistance of the inductor

Vout

max

= nominal output voltage plus maximum output voltage tolerance

ENABLE

UNDERVOLTAGE LOCKOUT

TPS62200 , , TPS62201

TPS62202 , TPS62203 , TPS62207

TPS62204 , TPS62205 , TPS62208

SLVS417E – MARCH 2002 – REVISED MAY 2006

DETAILED DESCRIPTION (continued)

As described in the power save mode operation sections and as detailed in Figure 2 , the output voltage is

typically 0.8% above the nominal output voltage at light load currents, as the device is in power save mode. This

gives additional headroom for the voltage drop during a load transient from light load to full load. During a load

transient from full load to light load, the voltage overshoot is also minimized due to active regulation turning on

the N-channel rectifier switch.

The TPS6220x has an internal soft start circuit that limits the inrush current during start-up. This prevents

possible voltage drops of the input voltage in case a battery or a high impedance power source is connected to

the input of the TPS6220x.

The soft start is implemented as a digital circuit increasing the switch current in steps of typically 60 mA,120 mA,

240 mA and then the typical switch current limit of 480 mA. Therefore the start-up time mainly depends on the

output capacitor and load current. Typical start-up time with 10 µF output capacitor and 200 mA load current is

800 µs.

The TPS6220x offers a low input to output voltage difference, while still maintaining operation with the 100%

duty cycle mode. In this mode, the P-channel switch is constantly turned on. This is particularly useful in battery

powered applications to achieve longest operation time by taking full advantage of the whole battery voltage

range. The minimum input voltage to maintain regulation, depending on the load current and output voltage, can

be calculated as

Pulling the enable low forces the part into shutdown, with a shutdown quiescent current of typically 0.1 µA. In

this mode, the P-channel switch and N-channel rectifier are turned off, the internal resistor feedback divider is

disconnected, and the whole device is in shutdown mode. If an output voltage, which could be an external

voltage source or super cap, is present during shutdown, the reverse leakage current is specified under

electrical characteristics. For proper operation the enable pin must be terminated and must not be left floating.

Pulling the enable high starts up the TPS6220x with the soft start as previously described.

The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the

converter from turning on the switch or rectifier MOSFET under undefined conditions.

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ABSOLUTE MAXIMUM RATINGS

DISSIPATION RATING TABLE

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS

TPS62200 , , TPS62201

TPS62202 , TPS62203 , TPS62207

TPS62204 , TPS62205 , TPS62208

SLVS417E – MARCH 2002 – REVISED MAY 2006

over operating free-air temperature (unless otherwise noted)

(1)

UNIT

Supply voltages, V

(2)

-0.3 V to 7.0 V

Voltages on pins SW, EN, FB

(2)

-0.3 V to V

+0.3 V

Continuous power dissipation, P

See Dissipation Rating Table

Operating junction temperature range, T

-40°C to 150°C

Storage temperature, T

stg

-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.

≤ 25°C T

= 70°C T

= 85°C

PACKAGE R

θ JA

POWER RATING POWER RATING POWER RATING

DBV 250°/W 400 mW 220 mW 160 mW

MIN NOM MAX UNIT

Supply voltage, V

2.5 6.0 V

Output voltage range for adjustable output voltage version, V

0.7 V

Output current, I

300 mA

Inductor, L

(1)

4.7 10 µH

Input capacitor, C

(1)

4.7 µF

Output capacitor, C

(1)

10 µF

Operating ambient temperature, T

40 85 °C

Operating junction temperature, T

40 125 °C

(1) See the application section for further information.

= 3.6 V, V

= 1.8 V, I

= 200 mA, EN = VIN, T

= -40 °C to 85 °C, typical values are at T

= 25 °C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY CURRENT

Input voltage range 2.5 6.0 V

Operating quiescent current I

= 0 mA, Device is not switching 15 30 µA

Shutdown supply current EN = GND 0.1 1 µA

Undervoltage lockout threshold 1.5 2.0 V

ENABLE

(EN)

EN high level input voltage 1.3 V

EN low level input voltage 0.4 V

(EN)

EN input bias current EN = GND or VIN 0.01 0.1 µA

POWER SWITCH

= V

= 3.6 V 530 690

P-channel MOSFET on-resistance m Ω

= V

= 2.5 V 670 850

(ON)

= V

= 3.6 V 430 540

N-channel MOSFET on-resistance m Ω

= V

= 2.5 V 530 660

lkg_(P)

P-channel leakage current V

= 6.0 V 0.1 1 µA

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TPS62200 , , TPS62201

TPS62202 , TPS62203 , TPS62207

TPS62204 , TPS62205 , TPS62208

SLVS417E – MARCH 2002 – REVISED MAY 2006

ELECTRICAL CHARACTERISTICS (continued)

= 3.6 V, V

= 1.8 V, I

= 200 mA, EN = VIN, T

= -40 °C to 85 °C, typical values are at T

= 25 °C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

lkg_(N)

N-channel leakage current V

= 6.0 V 0.1 1 µA

(LIM)

P-channel current limit 2.5 V < Vin < 6.0 V 380 480 670 mA

OSCILLATOR

Switching frequency 650 1000 1500 kHz

OUTPUT

Adjustable output voltage

TPS62200 0.7 V

range

ref

Reference voltage 0.5 V

TPS62200 V

= 3.6 V to 6.0 V, I

= 0 mA 0% 3%

Feedback voltage

(1)

Adjustable V

= 3.6 V to 6.0 V, 0 mA ≤ I

≤ 300 mA -3% 3%

TPS62207 V

= 2.5 V to 6.0 V, I

= 0 mA 0% 3%

1.2 V V

= 2.5 V to 6.0 V, 0 mA ≤ I

≤ 300 mA -3% 3%

TPS62201 V

= 2.5 V to 6.0 V, I

= 0 mA 0% 3%

1.5 V V

= 2.5 V to 6.0 V, 0 mA ≤ I

≤ 300 mA -3% 3%

TPS62204 V

= 2.5 V to 6.0 V, I

= 0 mA 0% 3%

1.6 V V

= 2.5 V to 6.0 V, 0 mA ≤ I

≤ 300 mA -3% 3%

TPS62202 V

= 2.5 V to 6.0 V, I

= 0 mA 0% 3%

Fixed output voltage

(1)

1.8 V V

= 2.5 V to 6.0 V, 0 mA ≤ I

≤ 300 mA -3% 3%

TPS62208 V

= 2.5 V to 6.0 V, I

= 0 mA 0% 3%

1.875 V V

= 2.5 V to 6.0 V, 0 mA ≤ I

≤ 300 mA -3% 3%

TPS62205 V

= 2.7 V to 6.0 V, I

= 0 mA 0% 3%

2.5 V V

= 2.7 V to 6.0 V, 0 mA ≤ I

≤ 300 mA -3% 3%

TPS62203 V

= 3.6 V to 6.0 V, I

= 0 mA 0% 3%

3.3 V V

= 3.6 V to 6.0 V, 0 mA ≤ I

≤ 300 mA -3% 3%

Line regulation V

= 2.5 V to 6.0 V, I

= 10 mA 0.26 %/V

Load regulation I

= 100 mA to 300 mA 0.0014 %/mA

lkg

Leakage current into SW pin Vin > Vout, 0 V ≤ Vsw ≤ Vin 0.1 1 µA

lkg

(Rev) Reverse leakage current into pin SW Vin = open, EN = GND, V

= 6.0 V 0.1 1 µA

(1) For output voltages ≤ 1.2 V a 22 µF output capacitor value is required to achieve a maximum output voltage accuracy of 3% while

operating in power save mode (PFM mode)

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