Datasheet

ManualsBrandsANALOG DEVICES ManualsPMICsPMIC - DC/DC voltage regulator Boost LFCSP 6 UD

2 MHz, Synchronous Boost

DC-to-DC Converter

Data Sheet

ADP1607

Rev. C Document Feedback

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 infringements 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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support www.analog.com

FEATURES

Up to 96% efficiency

0.8 V to V

OUT

input voltage range

Low 0.9 V input start-up voltage

1.8 V to 3.3 V output voltage range

23 µA quiescent current

Fixed PWM and light load PFM mode options

Synchronous rectification

True shutdown output Isolation

Internal soft start, compensation, and current limit

2 mm × 2 mm, 6-lead LFCSP

Compact solution size

APPLICATIONS

1-cell and 2-cell alkaline and NiMH/NiCd powered devices

Portable audio players, instruments, and medical devices

Solar cell applications

Miniature hard disk power supplies

Power LED status indicators

GENERAL DESCRIPTION

The ADP1607 is a high efficiency, synchronous, fixed

frequency, step-up dc-to-dc switching converter with an

adjustable output voltage between 1.8 V and 3.3 V for use

in portable applications.

The 2 MHz operating frequency enables the use of small

footprint, low profile external components. Additionally, the

synchronous rectification, internal compensation, internal fixed

current limit, and current mode architecture allow for excellent

transient response and a minimal external part count.

Other key features include fixed PWM and light load PFM

mode options, true output isolation, thermal shutdown (TSD),

and logic controlled enable. Available in a lead-free, thin, 6-lead

LFCSP package, the ADP1607 is ideal for providing efficient

power conversion in portable devices.

TYPICAL APPLICATION CIRCUIT

10276-001

ADP1607

VIN

VOUT

OFF

GND

ADJUSTABLE

OUTPUT VOLTAGE

1.8V TO 3.3V

INPUT VOLTAGE

0.8V TO V

OUT

2.2µH

10µF

OUT

10µF

Figure 1.

Summary of content (16 pages)

PAGE 1
2 MHz, Synchronous Boost DC-to-DC Converter ADP1607 Data Sheet FEATURES GENERAL DESCRIPTION Up to 96% efficiency 0.8 V to VOUT input voltage range Low 0.9 V input start-up voltage 1.8 V to 3.
PAGE 2
ADP1607 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Overview ..................................................................................... 10 Applications ....................................................................................... 1 Enable/Shutdown ....................................................................... 10 General Description ...................................................
PAGE 3
Data Sheet ADP1607 SPECIFICATIONS VIN = VEN = 1.2 V, VOUT = 3.3 V at TA = −40°C to +85°C for minimum/maximum specifications, and TA = 25°C for typical specifications, unless otherwise noted. 1 Table 1.
PAGE 4
ADP1607 Data Sheet ABSOLUTE MAXIMUM RATINGS Table 2. Parameter VIN, VOUT to GND FB to GND EN, SW to GND (when VIN ≥ VOUT) EN, SW to GND (when VIN < VOUT) EPAD to GND Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Soldering Conditions Rating −0.3 V to +3.6 V −0.3 V to +1.4 V −0.3 V to VIN + 0.3 V −0.3 V to VOUT + 0.3 V −0.3 V to + 0.
PAGE 5
Data Sheet ADP1607 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS VIN 1 6 VOUT ADP1607 FB 3 TOP VIEW (Not to Scale) 7 EPAD 5 SW 4 GND NOTES 1. CONNECT THE EXPOSED PAD TO GND. 10276-002 EN 2 Figure 2. Pin Configuration Table 4. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 Mnemonic VIN EN FB GND SW VOUT EPAD Description Analog and Power Supply Pin. Shutdown Control Pin. Drive EN high to turn on the synchronous boost, drive EN low to turn it off. Output Voltage Feedback Pin.
PAGE 6
ADP1607 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS VIN = 1.2 V, VOUT = 3.3 V, L = 2.2 µH (DCRMAX = 66 mΩ, VLF302512MT-2R2M), CIN = 10 µF, COUT = 10 µF (10 V, 20%, LMK107BJ106MALT), VEN = VIN, and TA = 25°C, unless otherwise noted. 1.84 VOUT = 1.8V VIN = 0.8V VIN = 1.2V VIN = 1.5V VOUT = 1.8V 90 1.83 OUTPUT VOLTAGE (V) 80 60 50 40 30 20 10 100 1000 LOAD CURRENT (mA) 1.78 0.1 2.56 VOUT = 2.5V 100 OUTPUT VOLTAGE (V) 2.54 70 60 50 40 30 0 0.1 1 10 100 1000 LOAD CURRENT (mA) 2.
PAGE 7
ADP1607 270 30 ISW = 500mA 240 PMOS RDSON (mΩ) 27 24 21 TA = –40°C TA = +25°C TA = +45°C TA = +85°C 15 1.8 3.3 2.8 2.3 INPUT VOLTAGE (V) 210 TA = +90°C 180 TA = +25°C 150 TA = –40°C 120 1.8 3.3 2.8 OUTPUT VOLTAGE (V) Figure 12. PMOS Drain-to-Source On Resistance Figure 9. Nonswitching PFM Mode Quiescent Current vs. Input Voltage 1200 5 TA = –40°C TA = +25°C TA = +45°C TA = +90°C VOUT = 3.3V VOUT = 2.5V 1100 VOUT = 1.8 V CURRENT LIMIT (mA) 4 3 2 1000 900 800 1 1.4 1.9 2.
PAGE 8
ADP1607 Data Sheet 88.4 VIN = 1.2V VOUT = 3.3V ILOAD = 1mA TO 50mA MAXIMUM DUTY CYCLE (%) 88.0 1 TA = +90°C TA = –40°C 87.6 OUTPUT VOLTAGE (100mV/DIV) AC-COUPLED 87.2 TA = +25°C LOAD CURRENT (50mA/DIV) 86.8 2.3 2.8 3.3 OUTPUT VOLTAGE (V) TIME (200µs/DIV) 10276-015 86.4 1.8 Figure 15. Maximum Duty Cycle vs. Output Voltage 10276-018 4 Figure 18. PFM Mode Load Transient Response (Auto Mode Part) 2.04 VIN = 1.2V VOUT = 3.3V ILOAD = 50mA TO 100mA FREQUENCY (MHz) 2.02 1 VOUT = 3.
PAGE 9
Data Sheet ADP1607 VIN = 1.2V VOUT = 3.3V RLOAD = 33Ω OUTPUT VOLTAGE (20mV/DIV) AC COUPLED OUTPUT VOLTAGE (1V/DIV) 1 SW PIN VOLTAGE (2V/DIV) SW PIN VOLTAGE (2V/DIV) 1 2 2 INDUCTOR CURRENT (500mA/DIV) 10276-021 EN PIN VOLTAGE (1V/DIV) VIN = 1.2V VOUT = 3.3V ILOAD = 100mA 3 TIME (200µs/DIV) 4 TIME (400ns/DIV) Figure 21. Startup, RLOAD = 33 Ω Figure 23.
PAGE 10
ADP1607 Data Sheet THEORY OF OPERATION L1 VIN SW 5 VIN 1 CIN BULK CONTROL VOUT VDD VIN VSEL VSEL + VOUT R1 ERROR AMPLIFIER VOUT 6 CURRENT SENSING COUT P FB OSCILLATOR 3 R2 A + PWM COMPARATOR PMOS BULK CONTROL P DRIVER VREF RCOMP CCOMP QP S CURRENT-LIMIT COMPARATOR N DRIVER SW N QN R SOFT START RP RESET ZERO CROSS TSD COMPARATOR TSENSE TREF SHUTDOWN PFM COMPARATOR VREF 2 4 GND 10276-033 EN AGND PFM CONTROL ON OFF Figure 24.
PAGE 11
Data Sheet ADP1607 operates in PFM mode for light load currents and switches to PWM mode for medium and heavy load currents. INTERNAL CONTROL FEATURES Pulse Frequency Modulation (PFM) While in shutdown, the ADP1607 manages the voltage of the bulk of the PMOS to force it off and internally isolate the path from the input to output. This allows the output to drop to ground, reducing the current consumption of the application in shutdown.
PAGE 12
ADP1607 Data Sheet APPLICATIONS INFORMATION SETTING THE OUTPUT VOLTAGE The ADP1607 can be configured for output voltages between 1.8 V and 3.3 V. The output voltage is set by a resistor voltage divider, R1, from the output voltage (VOUT) to the 1.259 V feedback input at FB and R2 from FB to GND (see Figure 24). Resistances between 100 kΩ and 1 MΩ are recommended.
PAGE 13
Data Sheet ADP1607 CHOOSING THE INPUT CAPACITOR CHOOSING THE OUTPUT CAPACITOR The ADP1607 also requires a 10 µF output capacitor (COUT) to maintain the output voltage and supply current to the load. The output capacitor supplies the current to the load when the Nchannel switch is turned on. Similar to CIN, a 4 V or greater, low ESR, X5R or X7R ceramic capacitor is recommended for COUT.
PAGE 14
ADP1607 Data Sheet LAYOUT GUIDELINES CIN 0402 For high efficiency, good regulation, and stability, a welldesigned printed circuit board layout is required. COUT 0402 Use the following guidelines when designing printed circuit boards (also see Figure 24 for a block diagram and Figure 2 for a pin configuration). VOUT 6 VIN 1 ADP1607 EN 2 TOP VIEW • 5 SW 4 GND FB 3 R1 0402 6.5mm 7 EPAD • R2 0402 • L 2.2µH 0805 10276-035 3.0mm • Figure 26.
PAGE 15
Data Sheet ADP1607 OUTLINE DIMENSIONS 1.70 1.60 1.50 2.10 2.00 SQ 1.90 0.65 BSC 6 PIN 1 INDEX AREA 0.15 REF 1.10 1.00 0.90 EXPOSED PAD 0.425 0.350 0.275 3 TOP VIEW 0.60 0.55 0.50 SEATING PLANE 0.05 MAX 0.02 NOM 0.35 0.30 0.25 0.20 MIN 1 BOTTOM VIEW PIN 1 INDICATOR (R 0.15) FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. 0.20 REF 02-06-2013-D 4 Figure 27. 6-Lead Lead Frame Chip Scale Package [LFCSP_UD] 2.