ANALOG DEVICES ADP2301 Service Manual

1.2 A, 20 V, 700 kHz/1.4 MHz,

C

Nonsynchronous Step-Down Regulator

FEATURES

1.2 A maximum load current ±2% output accuracy over temperature range Wide input voltage range: 3.0 V to 20 V 700 kHz (ADP2300) or 1.4 MHz (ADP2301)

switching frequency options High efficiency up to 91% Current-mode control architecture Output voltage from 0.8 V to 0.85 × V Automatic PFM/PWM mode switching Precision enable pin with hysteresis Integrated high-side MOSFET Integrated bootstrap diode Internal compensation and soft start Minimum external components Undervoltage lockout (UVLO) Overcurrent protection (OCP) and thermal shutdown (TSD) ADIsimPower™ online design tool Available in ultrasmall, 6-lead TSOT package

APPLICATIONS

LDO replacement for digital load applications Intermediate power rail conversion Communications and networking Industrial and instrumentation Healthcare and medical Consumer

IN

ADP2300/ADP2301

TYPICAL APPLICATIONS CIRCUIT

Figure 1.

I

(A)

OUT

BST

SW

FB

f

SW

f

SW

3.0V TO 20V

OFF

100

95

90

85

Y (%)

80

75

EFFICIEN

70

65

60

0 0.2 0.4 0.6 0.8 1.0 1.2

VIN

ADP2300/

ADP2301

EN

ON

Figure 2. Efficiency vs. Output Current

GND

= 1.4MHz = 700kHz

V

= 12V

IN

V

OUT

V

= 5.0V

OUT

08342-001

08342-069

GENERAL DESCRIPTION

The ADP2300/ADP2301 are compact, constant-frequency, current-mode, step-down dc-to-dc regulators with integrated power MOSFET. The ADP2300/ADP2301 devices run from input voltages of 3.0 V to 20 V, making them suitable for a wide range of applications. A precise, low voltage internal reference makes these devices ideal for generating a regulated output voltage as low as 0.8 V, with ±2% accuracy, for up to 1.2 A load current.

There are two frequency options: the ADP2300 runs at 700 kHz, and the ADP2301 runs at 1.4 MHz. These options allow users to make decisions based on the trade-off between efficiency and

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringem ents of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

total solution size. Current-mode control provides fast and stable line and load transient performance. The ADP2300/ADP2301 devices include internal soft start to prevent inrush current at power-up. Other key safety features include short-circuit protection, thermal shutdown (TSD), and input undervoltage lockout (UVLO). The precision enable pin threshold voltage allows the ADP2300/ADP2301 to be easily sequenced from other input/ output supplies. It can also be used as a programmable UVLO input by using a resistive divider.

The ADP2300/ADP2301 are available in a 6-lead TSOT package and are rated for the −40°C to +125°C junction temperature range.

ADP2300/ADP2301

REVISION HISTORY

6/10—Rev. 0 to Rev. A

Changes to Figure 54 ...................................................................... 25

Changes to Ordering Guide .......................................................... 26

2/10—Revision 0: Initial Version

Rev. A | Page 2 of 28

ADP2300/ADP2301

SPECIFICATIONS

VIN = 3.3 V, TJ = −40°C to +125°C for minimum/maximum specifications, and TA = 25°C for typical specifications, unless otherwise noted.

Table 1.

Parameter Symbol Test Conditions Min Typ Max Unit

VIN

Voltage Range VIN 3 20 V

Supply Current I

Shutdown Current I

Undervoltage Lockout Threshold UVLO VIN rising 2.80 2.95 V

V

FB

Regulation Voltage VFB T

T

Bias Current IFB 0.01 0.1 μA

SW

On Resistance1 V

Peak Current Limit2 V

Minimum On Time 100 135 ns

Minimum Off Time ADP2300 145 190 ns

ADP2301 70 120 ns

OSCILLATOR FREQUENCY ADP2300 0.5 0.7 0.9 MHz

ADP2301 1.0 1.4 1.75 MHz

SOFT START TIME ADP2300 1460 μs

ADP2301 730 μs

EN

Input Threshold VEN 1.13 1.2 1.27 V

Input Hysteresis 100 mV

Pull-Down Current 1.2 μA

BOOTSTRAP VOLTAGE V THERMAL SHUTDOWN

Threshold 140 °C

Hysteresis 15 °C

1

Pin-to-pin measurements.

2

Guaranteed by design.

No switching, VIN = 12 V 640 800 μA

VIN

VEN = 0 V, VIN = 12 V 18 35 μA

SHDN

falling 2.15 2.40 V

IN

= 0°C to +125°C 0.788 0.800 0.812 V

J

= −40°C to +125°C 0.784 0.800 0.816 V

J

− VSW = 5 V, ISW = 150 mA 440 700 mΩ

BST

− VSW = 5 V, VIN = 12 V 1.5 1.9 2.5 A

BST

No switching, VIN = 12 V 5.0 V

BOOT

Rev. A | Page 3 of 28

ADP2300/ADP2301

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

VIN, EN −0.3 V to +28 V SW −1.0 V to +28 V BST to SW −0.6 V to +6 V BST −0.3 V to +28 V FB −0.3 V to +3.3 V Operating Junction Temperature Range −40°C to +125°C Storage Temperature Range −65°C to +150°C Soldering Conditions JEDEC J-STD-020

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Absolute maximum ratings apply individually only, not in combination. Unless otherwise specified, all voltages are referenced to GND.

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.

Table 3. Thermal Resistance

Package Type θJA θ

6-Lead TSOT 186.02 66.34 °C/W

1

θJA and θJC are measured using natural convection on a JEDEC 4-layer board.

1

Unit

JC

ESD CAUTION

Rev. A | Page 4 of 28

ADP2300/ADP2301

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

BST

GND

FB

1

ADP2300/

ADP2301

2

TOP VIEW

(Not to Scale)

3

6

SW

5

VIN

4

EN

08342-002

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1 BST

Boost Supply for the High-Side MOSFET Driver. A 0.1 μF capacitor is connected between the SW and BST pins

to form a floating supply to drive the gate of the MOSFET switch above the VIN supply voltage. 2 GND Ground. Connect this pin to the ground plane. 3 FB

4 EN

Feedback Voltage Sense Input. Connect this pin to a resistive divider from V

desired V

OUT

.

Output Enable. Pull this pin high to enable the output. Pull this pin low to disable the output. This pin can

. Set the voltage to 0.8 V for a

OUT

also be used as a programmable UVLO input. This pin has a 1.2 μA pull-down current to GND. 5 VIN Power Input. Connect to the input power source with a ceramic bypass capacitor to GND directly from this pin. 6 SW Switch Node Output. Connect an inductor to V

and a catch diode to GND from this pin.

OUT

Rev. A | Page 5 of 28

ADP2300/ADP2301

C

TYPICAL PERFORMANCE CHARACTERISTICS

VIN = 3.3 V, TA = 25°C, VEN = VIN, unless otherwise noted.

100

90

100

INDUCTOR: LPS6225-103MLC DIODE: B230A

90

80

70

EFFICIENCY (%)

60

50

INDUCTOR: L PS6225-472MLC DIODE: B230A

40

0 0.2 0.4 0.6 0.8 1.0 1.2

I

(A)

OUT

V V V V

Figure 4. Efficiency Curve, VIN = 18 V, fSW = 1.4 MHz

100

90

80

Y (%)

70

EFFICIEN

60

50

INDUCTOR: L PS6225-103MLC DIODE: B230A

40

0 0.2 0.4 0.6 0.8 1.0 1.2

I

(A)

OUT

Figure 5. Efficiency Curve, VIN = 18 V, fSW = 700 kHz

80

Y (%)

70

EFFICIEN

60

V

= 5.0V

OUT OUT OUT OUT

= 12V = 9V = 5.0V = 3.3V

50

40

0 0.2 0.4 0.6 0.8 1.0 1.2

I

08342-070

OUT

(A)

OUT

V

= 3.3V

OUT

V

= 2.5V

OUT

V

= 1.8V

OUT

V

= 1.2V

OUT

8342-073

Figure 7. Efficiency Curve, VIN = 12 V, fSW = 700 kHz

100

INDUCTOR: L PS6225-472MLC DIODE: B230A

90

80

Y (%)

70

EFFICIEN

60

V

= 12V

OUT

V

= 9V

OUT

V

= 5.0V

OUT

V

= 3.3V

OUT

08342-071

50

40

0 0.2 0.4 0.6 0.8 1.0 1.2

I

(A)

OUT

V

= 2.5V

OUT

V

= 1.8V

OUT

V

= 1.2V

OUT

08342-074

Figure 8. Efficiency Curve, VIN = 5.0 V, fSW = 1.4 MHz

100

90

80

Y (%)

70

EFFICIEN

60

50

INDUCTOR: LPS6225-472MLC DIODE: B230A

40

0 0.2 0.4 0.6 0.8 1.0 1.2

I

(A)

OUT

Figure 6. Efficiency Curve, VIN = 12 V, fSW = 1.4 MHz

V

= 5.0V

OUT

V

= 3.3V

OUT

V

= 2.5V

OUT

08342-072

100

INDUCTOR: L PS6225-103MLC DIODE: B230A

90

80

70

EFFICIENCY (%)

60

50

40

0 0.2 0.4 0.6 0.8 1.0 1.2

I

(A)

OUT

Figure 9. Efficiency Curve, VIN = 5.0 V, fSW = 700 kHz

V

= 2.5V

OUT

= 1.8V

V

OUT

= 1.2V

V

OUT

08342-075

Rev. A | Page 6 of 28

ADP2300/ADP2301

A

C

100

90

80

70

EFFICIENCY (%)

60

50

INDUCTOR: L PS6225-472MLC DIODE: B230A

40

0 0.2 0.4 0.6 0.8 1.0 1.2

I

(A)

OUT

V

= 1.8V

OUT

V

= 1.2V

OUT

V

= 0.8V

OUT

Figure 10. Efficiency Curve, VIN = 3.3 V with External 5.0 V Bootstrap Bias

Voltage, f

= 1.4 MHz

SW

08342-089

0.20

0.15

0.10

0.05

TION (%)

0

–0.05

LINE REGUL

–0.10

–0.15

–0.20

5 8 11 14 17 20

VIN (V)

Figure 13. Line Regulation, V

= 3.3 V, I

OUT

f

SW

f

SW

= 500 mA

OUT

= 1.4MHz = 700kHz

8342-068

100

90

80

70

EFFICIENCY (%)

60

50

INDUCTOR: LPS6225-103MLC DIODE: B230A

40

0 0.2 0.4 0.6 0.8 1.0 1.2

(A)

I

OUT

V

= 1.8V

OUT

V

= 1.2V

OUT

V

= 0.8V

OUT

Figure 11. Efficiency Curve, VIN = 3.3 V with External 5.0 V Bootstrap Bias

Voltage, f

0.20

0.15

0.10

0.05

TION (%)

0

= 700 kHz

SW

FSW = 1.4MHz F

= 700kHz

SW

1600

1400

1200

Y (kHz)

1000

800

FREQUEN

600

400

–50 –20 10 40 70 100 130

08342-066

TEMPERATURE (°C)

f

SW

f

SW

= 1.4MHz = 700kHz

08342-076

Figure 14. Frequency vs. Temperature

1600

1400

1200

Y (kHz)

1000

f

SW

f

SW

= 1.4MHz = 700kHz

–0.05

LOAD REGUL

–0.10

–0.15

–0.20

0.20 0.4 0.6 0.8 1.0 1.2

Figure 12. Load Regulation, V

I

OUT

(A)

OUT

8342-067

= 3.3 V, VIN = 12 V

800

FREQUEN

600

400

2 5 8 11 14 17 20

V

(V)

IN

Figure 15. Frequency vs. VIN

08342-077

Rev. A | Page 7 of 28

ADP2300/ADP2301

40

35

160

140

f

SW

f

SW

= 1.4MHz = 700kHz

30

25

20

15

10

SHUTDOWN CURRENT (µA)

5

0

2 5 8 11 14 17 20

VIN (V)

Figure 16. Shutdown Current vs. VIN

0.804

0.802

0.800

0.798

0.796

0.8V FEEDBACK VO LTAGE (V)

0.794

T

= −40°C

J

T

= +25°C

J

T

= +125°C

J

120

100

80

60

MINIMUM OFF TIME (ns)

40

20

0

–50 –20 10 40 70 100 130

8342-078

TEMPERATURE (°C)

08342-081

Figure 19. Minimum Off Time vs. Temperature

2.5

2.0

1.5

1.0

CURRENT LIMIT (A)

0.5

0.792

–50 –20 10 40 70 100 130

TEMPERATURE (°C)

Figure 17. 0.8 V Feedback Voltage vs. Temperature

110

105

100

95

90

MINIMUM ON TIME (ns)

85

80

–50 –20 10 40 70 100 130

TEMPERATURE (°C)

Figure 18. Minimum On Time vs. Temperature

0

2 5 8 11 14 17 20

08342-079

Figure 20. Current-Limit Threshold vs. VIN, V

2.5

2.0

1.5

1.0

CURRENT LIMIT (A)

0.5

0

–50 –20 10 40 70 100 130

08342-080

VIN (V)

TEMPERATURE (°C)

BST − VSW

= 5.0 V

08342-082

08342-083

Figure 21. Current-Limit Threshold vs. Temperature

Rev. A | Page 8 of 28

ADP2300/ADP2301

m

700

660

620

580

QUIESCENT CURRENT (µA)

540

500

25811141720

V

(V)

IN

TJ = −40°C T

= +25°C

J

T

= +125°C

J

Figure 22. Quiescent Current vs. VIN

900

800

700

Ω)

600

(

500

DS (ON)

400

300

MOSFET R

200

100

0

–50 –20 10 40 70 100 130

TEMPERATURE (°C)

Figure 23. MOSFET R

vs. Temperature (Pin-to-Pin Measurements)

DS(ON)

VGS = 5V V

GS

V

GS

= 4V = 3V

08342-084

08342-085

3.0

2.9

2.8

2.7

2.6

2.5

2.4

2.3

UVLO THRESHO LD (V)

2.2

2.1

2.0

–50 –20 10 40 70 100 130

TEMPERATURE (°C)

Figure 25. UVLO Threshold vs. Temperature

V

OUT

1

4

2

CH1 5mV

B

CH2 5V M400ns A CH2 7.4V

W

CH4 500mA Ω

Figure 26. Steady State at Heavy Load, f

IL

SW

B

W

B

W

= 1.4 MHz, I

SW

RISING FALLING

= 1 A

OUT

08342-087

08342-024

1.30

1.25

RISING FALLING

V

1

OUT

1.20

1.15

4

IL

1.10

ENABLE THRESHOLD (V)

1.05

1.00

–50 –20 10 40 70 100 130

TEMPERATURE (°C)

Figure 24. Enable Threshold vs. Temperature

2

CH1 20mV

08342-086

B

CH2 5V M10µs A CH2 8V

W

CH4 200mA Ω

Figure 27. Steady State at Light Load, fSW = 1.4 MHz, I

SW

B

W

B

W

OUT

= 40 mA

8342-025

Rev. A | Page 9 of 28

ANALOG DEVICES ADP2301 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

APPLICATIONS

TYPICAL APPLICATIONS CIRCUIT

GENERAL DESCRIPTION

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

THERMAL RESISTANCE

ESD CAUTION

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TYPICAL PERFORMANCE CHARACTERISTICS