FAN48610BUC33X - ON SEMICONDUCTOR

July, 2018 − Rev. 2

1Publication Order Number:

FAN48610/D

FAN48610

Fixed-Output Synchronous

Regulator, TINYBOOST),

2.5 MHz

Description

The FAN48610 is a low-power boost regulator designed to provide

a minimum voltage-regulated rail from a standard single-cell Li-Ion

battery and advanced battery chemistries. Even below the minimum

system battery voltage, the device maintains the output voltage

regulation for a minimum output load current of 1.0 A. The

combination of built-in power transistors, synchronous rectification,

and low supply current suit the FAN48610 for battery-powered

applications.

The FAN48610 is available in a 9-bump, 0.4 mm pitch, Wafer-Level

Chip-Scale Package (WLCSP).

Features

•Input Voltage Range: 2.5 V to 4.8 V

•Output Voltages Range: 3.0 V to 5.0 V

•IOUT ≥ 1 A at VOUT = 5.0 V, VIN ≥ 2.5 V

•IOUT ≥ 1.5 A at VOUT = 5.0 V, VIN ≥ 3.0 V

•Up to 94% Efficient

•Internal Synchronous Rectification

•Soft-Start with True Load Disconnect

•Short-Circuit Protection

•9-Bump, 1.215 mm × 1.215 mm, 0.4 mm Pitch WLCSP

•Three External Components: 2016 0.47 mH Inductor,

0603 Case Size Input / Output Capacitors

•Total Application Board Solution Size: < 11 mm2

Applications

•Class-D Audio Amplifier and USB OTG Supply

•Boost for Low-Voltage Li-Ion Batteries

•Smart Phones, Tablets, Portable Devices, Wearables

Figure 1. Typical Application

FAN48610

VOUT

PGND

COUT

0.47 mH

22 mF

VIN

CIN

Battery SYSTEM

LOAD

AGND

10 mF

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WLCSP9

CASE 567QW

See detailed ordering and shipping information on page 2 of

this data sheet.

ORDERING INFORMATION

MARKING DIAGRAM

XX = KA / KF / KN

&K = Lot Code

&. = Alphabetical Year Code

&2 = Numeric Date Code

&Z = Assembly Plant Code

XX&K

&.&2&Z

PIN ASSIGNMENT

(Top View)

B3B2

C3C2

A3A2

VOUT

PGND

VIN

AGND

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Table 1. ORDERING INFORMATION

Part Number VOUT

Operating

Temperature Package Packing†Device Marking

FAN48610UC50X 5.0 V −40°C to 85°CWLCSP, 0.4 mm Pitch Tape and Reel KF

FAN48610BUC50X (Note 1)

FAN48610BUC45X (Note 1) 4.5 V KA

FAN48610BUC33X (Note 1) 3.3 V KN

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

1. Includes backside lamination.

BLOCK DIAGRAM

Figure 2. IC Block Diagram

Q2B Q2A

COUT

VOUT

Modulator

Logic & Control

VIN

CIN

Synchronous

Rectifier

Control

PGND

AGND

Table 2. RECOMMENDED COMPONENTS

Component Description Ventor Parameter Typ. Unit

L1 0.47 mH, 30%, 2016 Toko: DFE201612C DFR201612C

Cyntec: PIFE20161B

L 0.47 mH

DCR (Series R) 40 mW

CIN 10 mF, 10%, 6.3 V, X5R, 0603 Murata: GRM188R60J106K

TDK: C1608X5R0J106K

C 10 mF

COUT 22 mF, 20%, 6.3 V, X5R, 0603 TDK: C1608X5R0J226M C 22 mF

FAN48610

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PIN CONFIGURATION

Figure 3. Top View Figure 4. Bottom View

B3 B2

C3 C2

A3 A2

B3B2

C3C2

A3A2

VOUT

PGND

VIN

AGND

Table 3. PIN DEFINITIONS

Pin # Name Description

A1, A2 VOUT Output Voltage. This pin is the output voltage terminal; connect directly to COUT.

A3 VIN Input Voltage. Connect to Li-Ion battery input power source and the bias supply for the gate drivers.

B1, B2 SW Switching Node. Connect to inductor.

B3 EN Enable. When this pin is HIGH, the circuit is enabled.

C1, C2 PGND Power Ground. This is the power return for the IC. COUT capacitor should be returned with the shortest

path possible to these pins.

C3 AGND Analog Ground. This is the signal ground reference for the IC. All voltage levels are measured with

respect to this pin – connect to PGND at a single point.

Table 4. ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Min. Max. Unit

VIN Voltage on VIN Pin −0.3 6.0 V

VOUT Voltage on VOUT Pin 6.0 V

SW SW Node DC −0.3 6.0 V

Transient: 10 ns, 3 MHz −1.0 8.0

VCC Voltage on Other Pins −0.3 6.0

(Note 2) V

ESD Electrostatic Discharge Protection Level Human Body Model per JESD22−A114 2kV

Charged Device Model per JESD22−C101 1

TJJunction Temperature −40 +150 °C

TSTG Storage Temperature −65 +150 °C

TLLead Soldering Temperature, 10 Seconds +260 °C

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality

should not be assumed, damage may occur and reliability may be affected.

2. Lesser of 6.0 V or VIN + 0.3 V.

FAN48610

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Table 5. RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min. Max. Unit

VIN Supply Voltage 2.5 4.8 V

IOUT Maximum Output Current 1000 mA

TAAmbient Temperature –40 +85 °C

TJJunction Temperature –40 +125 °C

Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond

the Recommended Operating Ranges limits may affect device reliability.

Table 6. THERMAL PROPERTIES

Symbol Parameter Typical Unit

qJA Junction-to-Ambient Thermal Resistance 50 °C/W

Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with four-layer 2s2p boards in

accordance to JEDEC standard JESD51. Special attention must be paid not to exceed junction temperature TJ(max) at a given ambient temperate

TA.

Table 7. ELECTRICAL CHARACTERISTICS

(Recommended operating conditions, unless otherwise noted, circuit per Figure 1, VOUT= 3.0 V to 5.0 V, VIN = 2.5 V to 4.5 V, TA = −40°C

to 85°C. Typical values are given VIN = 3.6 V and TA = 25°C)

Symbol Parameter Conditions Min. Typ. Max. Unit

POWER SUPPLY

IQVIN Quiescent Current VIN = 3.6 V, IOUT = 0 A, EN = VIN 85 125 mA

Shutdown: EN = 0, VIN = 3.6 V 3 10

VUVLO Under-Voltage Lockout VIN Rising 2.2 2.3 V

VUVLO_HYS Under-Voltage Lockout

Hysteresis

150 mV

INPUTS

VIH Enable HIGH Voltage 1.05 V

VIL Enable LOW Voltage 0.4 V

IPD Current Sink Pull-Down EN Pin, Logic HIGH 100 nA

RLOW Low-State Active Pull-Down EN Pin, Logic LOW 200 300 400 kW

OUTPUTS

VREG Output Voltage Accuracy DC (Note 3) Referred to VOUT,

2.5 V ≤ VIN ≤ VOUT −150 mV

−24 %

ILK_OUT VIN-to-VOUT Leakage Current VOUT = 0, EN = 0, VIN = 4.2 V 1mA

ILK VOUT-to-VIN Reverse Leakage

Current

VOUT = 5.0 V, EN = 0, VIN = 2.5 V 3.5 mA

VTRSP Output Voltage Accuracy Transient

(Note 4)

Referred to VOUT

, 50−500 mA Load Step −5 5 %

TIMING

fSW Switching Frequency VIN = 3.6 V, VOUT = 5.0 V, Load = 1000 mA 2.0 2.5 3.0 MHz

tSS Soft-Start EN HIGH to Regulation

(Note 4)

50 W Load, VOUT = 5.0 V 600 mA

tRST FAULT Restart Timer (Note 4) 20 ms

FAN48610

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Table 7. ELECTRICAL CHARACTERISTICS (continued)

(Recommended operating conditions, unless otherwise noted, circuit per Figure 1, VOUT= 3.0 V to 5.0 V, VIN = 2.5 V to 4.5 V, TA = −40°C

to 85°C. Typical values are given VIN = 3.6 V and TA = 25°C)

Symbol UnitMax.Typ.Min.ConditionsParameter

POWER STAGE

RDS(ON)N N-Channel Boost Switch RDS(ON) VIN = 3.6 V, VOUT = 5.0 V 80 130 mW

RDS(ON)P P-Channel Sync. Rectifier RDS(ON) VIN = 3.6 V, VOUT = 5.0 V 65 115 mW

IV_LIM Boost Valley Current Limit VOUT = 5.0 V 3.0 A

IV_LIM_SS Boost Soft-Start Valley Current Limit VIN < VOUT < VOUT_TARGET, SS Mode 1.7 A

VMIN_1.0A Minimum VIN for 1000 mA Load

(Note 4)

VOUT = 5.0 V 2.5 V

VMIN_1.5A Minimum VIN for 1500 mA Load

(Note 4)

VOUT = 5.0 V 3.0 V

T150T Over-Temperature Protection (OTP) 150 °C

T150H OTP Hysteresis 20 °C

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product

performance may not be indicated by the Electrical Characteristics if operated under different conditions.

3. DC ILOAD from 0 to 1 A. VOUT measured from mid-point of output voltage ripple. Effective capacitance of COUT > 3 mF.

4. Guaranteed by design and characterization; not tested in production.

FAN48610

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TYPICAL CHARACTERISTICS

(Unless otherwise specified; VIN = 3.6 V, VOUT = 5.0 V, TA = 25°C, and circuit and components according to Figure 1)

76%

80%

84%

88%

92%

96%

1 10 100 1000

Efficiency

Load Current (mA)

2.6 VIN

3.0 VIN

3.6 VIN

4.2 VIN

−2

−1

0 250 500 750 1000

Output Regulation (%)

Load Current (mA)

−40C

+25C

+85C

−2

−1

0 250 500 750 1000

Output Regulation (%)

Load Current (mA)

2.6 VIN

3.0 VIN

3.6 VIN

4.2 VIN

78%

82%

86%

90%

94%

98%

10 100 1000

Efficiency

Load Current (mA)

−40C

+25C

+85C

80%

84%

88%

92%

96%

10 100 1000

Efficiency

Load Current (mA)

2.5 VIN

2.7 VIN

3.0 VIN

76%

80%

84%

88%

92%

96%

1 10 100 1000

Efficiency

Load Current (mA)

−40C

+25C

+85C

Figure 5. Efficiency vs. Load Current

and Input Voltage

Figure 6. Efficiency vs. Load Current

and Temperature

Figure 7. Efficiency vs. Load Current

and Input Voltage, VOUT = 3.3 V

Figure 8. Efficiency vs. Load Current and

Temperature, VIN = 3.0 V, VOUT = 3.3 V

Figure 9. Output Regulation vs. Load

Current and Input Voltage (Normalized

to 3.6 VIN, 500 mA Load)

Figure 10. Output Regulation vs. Load

Current and Temperature (Normalized to

3.6 VIN, 500 mA Load, TA = 255C)

FAN48610

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TYPICAL CHARACTERISTICS

(Unless otherwise specified; VIN = 3.6 V, VOUT = 5.0 V, TA = 25°C, and circuit and components according to Figure 1)

500

1,000

1,500

2,000

2,500

3,000

0 250 500 750 1000

Switching Frequency (KHz)

Load Current (mA)

2.6 VIN

3.0 VIN

3.6 VIN

4.2 VIN

0 250 500 750 1000

Output Ripple (mVpp)

Load Current (mA)

2.6 VIN

3.0 VIN

3.6 VIN

4.2 VIN

100

120

2.0 2.5 3.0 3.5 4.0 4.5

Input Current ( A)

Input Voltage (V)

−40C Auto

+25C Auto

+85C Auto

Figure 11. Quiescent Current vs. Input

Voltage, Temperature

Figure 12. Output Ripple vs. Load Current and

Input Voltage

Figure 13. Frequency vs. Load Current

and Input Voltage

Figure 14. Startup, 50 W Load

Figure 15. Overload Protection Figure 16. Load Transient, 100−500 mA,

100 ns Edge

FAN48610

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TYPICAL CHARACTERISTICS

(Unless otherwise specified; VIN = 3.6 V, VOUT = 5.0 V, TA = 25°C, and circuit and components according to Figure 1)

Figure 17. Load Transient, 500−1000 mA,

100 ns Edge

Figure 18. Simultaneous Line / Load

Transient, 3.3 −3.9 VIN, 10 ms Edge,

500−1000 mA Load, 100 ns Edge

Figure 19. Line Transient, 3.3−3.9 VIN,

10 ms Edge, 500 mA Load

Figure 20. Typical Maximum Output Current

vs. Input Voltage

0.60

1.00

1.40

1.80

2.20

2.60

2.5 3.0 3.5 4.0 4.5

Maximum Output Current (A)

Input Voltage (V)

+25C

+85C

FAN48610

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CIRCUIT DESCRIPTION

FAN48610 is a synchronous boost regulator, typically

operating at 2.5 MHz in Continuous Conduction Mode

(CCM), which occurs at moderate to heavy load current and

low VIN voltages. The regulator’s Pass-Through Mode

automatically activates when VIN is above the boost

regulator’s set point.

Table 8. OPERATING MODES

Mode Description Invoked When:

LIN Linear Startup VIN > VOUT

SS Boost Soft-Start VIN < VOUT < VOUT(TARGET)

BST Boost Operating Mode VOUT= VOUT(TARGET)

PT Pass-Through Mode VIN > VOUT(TARGET)

Boost Mode Regulation

The FAN48610 uses a current-mode modulator to achieve

excellent transient response and smooth transitions between

CCM and DCM operation. During CCM operation, the

device maintains a switching frequency of about 2.5 MHz.

In lightload operation (DCM), frequency is naturally

reduced to maintain high efficiency.

Shutdown and Startup

When EN is LOW, all bias circuits are off and the regulator

is in Shutdown Mode. During shutdown, current flow is

prevented from VIN to VOUT, as well as reverse flow from

VOUT to VIN. It is recommended to keep load current draw

below 500 mA until the devices successfully executes

startup. The following table describes the startup sequence.

Table 9. BOOST STARTUP SEQUENCE

Start Mode Entry Exit End Mode Timeout (ms)

LIN1 VIN > VUVLO, EN = 1 VOUT > VIN − 300 mV SS

TIMEOUT LIN2 512

LIN2 LIN1 Exit VOUT > VIN − 300 mV SS

TIMEOUT FAULT 1024

SS LIN1 or LIN2 Exit VOUT = VOUT(TARGET) BST

OVERLOAD TIMEOUT FAULT 64

LIN Mode

When EN is HIGH and VIN > VUVLO, the regulator first

attempts to bring VOUT within 300 mV of VIN by using the

internal fixed-current source from VIN (Q2). The current is

limited to the LIN1 set point.

If VOUT reaches VIN −300 mV during LIN1 Mode, the SS

Mode is initiated. Otherwise, LIN1 times out after 512 ms

and LIN2 Mode is entered.

In LIN2 Mode, the current source is incremented to 1.6 A.

If VOUT fails to reach VIN −300 mV after 1024 ms, a fault

condition is declared and the device waits 20 ms to attempt

an automatic restart.

Soft−Start (SS) Mode

Upon the successful completion of LIN Mode

(VOUT ≥VIN −300 mV), the regulator begins switching

with boost pulses current limited to 50% of nominal level.

During SS Mode, if VOUT fails to reach regulation during

the SS ramp sequence for more than 64 ms, a fault is

declared. If large COUT is used, the reference is

automatically stepped slower to avoid excessive input

current draw.

Boost (BST) Mode

This is a normal operating mode of the regulator.

Pass-Through (PT) Mode

In normal operation, the device automatically transitions

from Boost Mode to Pass-Through Mode if VIN goes above

the target VOUT. In Pass-Through Mode, the device fully

enhances Q2 to provide a very low impedance path from

VIN to VOUT. Entry to the Pass-Through Mode is triggered

by condition where VIN > VOUT and no switching has

occurred during the past 5 ms. To soften the entry into

Pass-Through Mode, Q2 is driven as a linear current source

for the first 5 ms. Pass-Through Mode exit is triggered when

VOUT reaches the target VOUT voltage. During Automatic

Pass-Through Mode, the device is short-circuit protected by

a voltage comparator tracking the voltage drop from VIN to

VOUT; if the drop exceeds 300 mV, a fault is declared.

Fault State

The regulator enters Fault State under any of the following

conditions:

•VOUT fails to achieve the voltage required to advance

from LIN Mode to SS Mode.

•VOUT fails to achieve the voltage required to advance

from SS Mode to BST Mode.

•Boost current limit triggers for 2 ms during BST Mode.

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•VIN – VOUT > 300 mV; this fault can occur only after

successful completion of the soft-start sequence.

•VIN < VUVLO.

Once a fault is triggered, the regulator stops switching and

presents a high-impedance path between VIN and VOUT.

After waiting 20 ms, an automatic restart is attempted.

Over-Temperature

The regulator shuts down if the die temperature exceeds

150°C. Restart occurs when the IC has cooled by

approximately 20°C.

APPLICATION INFORMATION

Output Capacitance (COUT)

The effective capacitance (CEFF (Note 5)) of small,

high-value ceramic capacitors decreases as their bias

voltage increases, as illustrated in the graph below:

Figure 21. CEFF for 22 mF, 0603, X5R, 6.3 V-Rated

Capacitor (TDK C1608X5R0J226M)

0123456

Capacitance ( F)

DC Bias Voltage (V)

FAN48610 is guaranteed for stable operation with the

minimum value of CEFF (CEFF(MIN)) outlined in Table 10.

Table 10. MINIMUM CEFF REQUIRED FOR STABILITY

Operating Conditions CEFF(MIN)

(mF)

VOUT (V) VIN (V) ILOAD (mA)

5.0 2.5 to 4.5 0 to 1000 3.0

5. CEFF varies by manufacturer, capacitor material, and case size.

6. CEFF、。

Introduction Selection

Recommended nominal inductance value is 0.47 mH. The

FAN48610 employs valley-current limiting, so peak

inductor current can reach 3.8 A for a short duration during

overload conditions. Saturation effects cause the inductor

current ripple to become higher under high loading, as only

the valley of the inductor current ripple is controlled.

Startup

Input current limiting is in effect during soft-start, which

limits the current available to charge COUT and any

additional capacitance on the VOUT line. If the output fails

to achieve regulation within the limits described in the

Soft-Start section above, a fault occurs, causing the circuit

to shut down. It waits about 20 ms before attempting

a restart. If the total combined output capacitance is very

high, the circuit may not start on the first attempt, but

eventually achieves regulation if no load is present. If a high

current load and high capacitance are both present during

soft-start, the circuit may fail to achieve regulation and

continually attempt soft-start, only to have the output

capacitance discharged by the load when in Fault State.

Output Voltage Ripple

Output voltage ripple is inversely proportional to COUT.

During tON, when the boost switch is on, all load current is

supplied by COUT.

VRIPPLE(P*P) +tON @

ILOAD

COUT

(eq. 1)

And

tON +tSW @D+tSW @ǒ1*

VIN

VOUTǓ(eq. 2)

therefore:

VRIPPLE(P*P) +tSW @ǒ1*

VIN

VOUTǓ@

ILOAD

COUT

(eq. 3)

tSW +1

fSW

(eq. 4)

The maximum VRIPPLE occurs when VIN is minimum and

ILOAD is maximum. For better ripple performance, more

output capacitance can be added.

Layout Recommendations

The layout recommendations below highlight various

topcopper pours by using different colors.

To minimize spikes at VOUT, COUT must be placed as

close as possible to PGND and VOUT, as shown below.

For thermal reasons, it is suggested to maximize the pour

area for all planes other than SW. Especially the ground pour

should be set to fill all available PCB surface area and tied

to internal layers with a cluster of thermal vias.

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Figure 22. Layout Recommendation

PRODUCT-SPECIFIC DIMENSIONS (This table pertains to the package information on the following page.)

DE X Y

1.215 ±0.030 mm 1.215 ±0.030 mm 0.2075 mm 0.2075 mm

TINYBOOST is a registered trademark of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States

and/or other countries.

WLCSP9 1.215x1.215x0.581

CASE 567QW

ISSUE O DATE 31 OCT 201

MECHANICAL CASE OUTLINE

PACKAGE DIMENSIONS

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October, 2002 − Rev. 0 Case Outline Number:

XXX

DOCUMENT NUMBER:

STATUS:

NEW STANDARD:

DESCRIPTION:

98AON13355G

ON SEMICONDUCTOR STANDARD

WLCSP9 1.215x1.215x0.581

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accessed directly from the Document Repository. Printed

versions are uncontrolled except when stamped

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ORELEASED FOR PRODUCTION FROM FAIRCHILD UC009AK TO ON SEMICON-

DUCTOR. REQ. BY F. ESTRADA. 31 OCT 2016

October, 2016 − Rev. O Case Outline Number

567QW

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