〇Product structure : Silicon monolithic integrated circuit 〇This product has no designed protection against radioactive rays

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TSZ02201-0Q1Q0AJ00400-1-2

10.Aug.2017 Rev.001

TSZ22111 • 14 • 001

www.rohm.com

Nano Energy

Ultra Low Iq Buck Converter

For Low Power Applications

BD70522GUL

General Description

The BD70522GUL is a Buck Converter featuring 180nA

quiescent current and supports output current up to

500mA. The Constant ON-Time (COT) control with ULP

(Ultra Low Power) mode provides superior transient

response and extends battery life by providing excellent

light load efficiency below 10µA load range. The output

voltage can be selected from 9 pre-set voltages by VSEL

pins. When the input voltage gets close to the output

voltage, the IC enters 100%ON mode where the

switching operation stops.

Features

 Nano Energy

 180nA (Typ) Quiescent Current

 Up to 90% Efficiency at 10µA Output Current

 Up to 500mA Output Current

 9 Selectable Output Voltages

(1.2V, 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.2V, 3.3V)

 Power Good Output

 100%ON Mode for Low Input Voltage

 Discharge Function on VOUT.

Applications

 Smoke Detector

 Thermostat

 Portable Devices

 Wearable Devices

 Low-Iq Applications without Standby Switcher

 Energy Harvesting

Key Specifications

 Input Voltage Range: 2.5V to 5.5V

 Output Voltage Range: 1.2V to 3.3V

 Maximum Output Current: 500mA

 Operating Quiescent Current: 180nA (Typ)

 Standby Current: 50nA (Typ)

 Operating Temperature Range: -40°C to +85°C

Package W(Typ) x D(Typ) x H(Max)

VCSP50L1C 1.76mm x 1.56mm x 0.57mm

Typical Application Circuit

VIN

VSEL1

VSEL2

VOUT

PGND

VIN VOUT

CIN

VPG

COUT

10μF

22μF

2.2μH

1.2V-3.3V

2.5V-5.5V

VEN

VSEL1

VSEL2

RPULLUP

AGND

Figure 1. Typical Application Circuit

「Nano Energy

」is a trademark of Rohm Co., Ltd.

Datashee

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TSZ02201-0Q1Q0AJ00400-1-2

10.Aug.2017 Rev.001

www.rohm.com

TSZ22111 • 15 • 001

BD70522GUL

Contents

General Description ........................................................................................................................................................................ 1

Features.......................................................................................................................................................................................... 1

Applications .................................................................................................................................................................................... 1

Key Specifications .......................................................................................................................................................................... 1

Package .......................................................................................................................................................................................... 1

Typical Application Circuit ................................ ................................ ............................................................................................... 1

Contents ................................................................................................................................................................ ......................... 2

Pin Configuration ............................................................................................................................................................................ 3

Pin Descriptions .............................................................................................................................................................................. 3

Block Diagram ................................................................................................................................................................................ 3

Absolute Maximum Ratings ............................................................................................................................................................ 4

Thermal Resistance ........................................................................................................................................................................ 4

Recommended Operating Conditions ............................................................................................................................................. 4

Electrical Characteristics................................................................................................................................................................. 4

Electrical Characteristics - continued .............................................................................................................................................. 5

Detailed Descriptions ...................................................................................................................................................................... 6

Typical Performance Curves ........................................................................................................................................................... 8

Figure 7-10. Efficiency vs Output Current ................................................................................................................................... 8

Figure 11-14. Output Voltage vs Output Current ......................................................................................................................... 9

Figure 15-18. Switching Frequency vs Output Current ............................................................................................................. 10

Figure 19-22. Output Ripple Voltage vs Output Current ............................................................................................................ 11

Figure 23-26. Load Transient Response ................................................................................................................................... 12

Figure 27-30. Line Transient Response .................................................................................................................................... 13

Figure 31-34. Line Transient Response .................................................................................................................................... 14

Figure 35-36. Startup................................................................................................................................................................. 15

Figure 37-38. Shutdown ............................................................................................................................................................ 15

Figure 39-42. Input Voltage Ramp Up/Down ............................................................................................................................. 16

Timing Chart ................................................................................................................................................................................. 17

Application Examples ................................................................................................................................................................... 18

I/O Equivalence Circuits................................................................................................................................................................ 19

Operational Notes ................................................................................................ ................................ ......................................... 20

Ordering Information ..................................................................................................................................................................... 22

Marking Diagram .......................................................................................................................................................................... 22

Physical Dimension and Packing Information ............................................................................................................................... 23

Revision History ............................................................................................................................................................................ 24