Datasheet AP3211HKTR-G1 Datasheet (BCD) [ru]

1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

PART OBSOLETE - USE AP3211 and AP5100

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SOT-23-6

Preliminary Datasheet

General Description

The AP3211H is a 1.4MHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 1.5A load with high efficiency,
excellent line and load regulation. The device
integrates N-channel power MOSFET switch with
low on-resistance. Current mode control provides fast
transient response and cycle-by-cycle current limit.

A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3211H. This feature greatly simplifies the
design of switch-mode power supplies.

The AP3211H is available in SOT-23-6 package.

Features

• Input Voltage Range: 4.5V to 23V

• Fixed 1.4MHz Frequency

• High Efficiency: up to 92%

• Output Current: 1.5A

• Current Mode Control

• Built-in Over Current Protection

• Built-in Thermal Shutdown Function

• Built-in UVLO Function

• Built-in Over Voltage Protection

• Built-in Soft-start

Applications

• LCD TV

• DPF

• Portable DVD

Figure 1. Package Type of AP3211H

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1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

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BS

1

2

3 4

5

Pin 1 Mark

6

GND

FB

SW

IN

EN

Pin Number

Pin Name

Function

1

BS

Bootstrap pin. A bootstrap capacitor is connected between the
BS pin and SW pin. The voltage across the bootstrap
capacitor drives the internal high-side NMOS switch

2

GND

Ground pin

3

FB

Feedback pin. This pin is connected to an external resistor
divider to program the system output voltage. When VFB
exceeds 20% of the nominal regulation value of 0.81V, the

OVP is triggered. When VFB＜0.25V, the oscillator frequency
is lowered to realize short circuit protection

4

EN

Control input pin. Forcing this pin above 1.5V enables the IC.
Forcing this pin below 0.4V shuts down the IC. When the IC
is in shutdown mode, all functions are disabled to decrease
the supply current below 1A

5

IN

Supply input pin. A capacitor should be connected between
the IN pin and GND pin to keep the DC input voltage
constant

6

SW

Power switch output pin. This pin is connected to the inductor
and bootstrap capacitor

Preliminary Datasheet

Pin Configuration

K Package

(SOT-23-6)

Figure 2. Pin Configuration of AP3211H (Top View)

Pin Description

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1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

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REFERENCE

VOLTAGE

ERR AMP

PWM

COMPARATOR

FB

GND

EN

VDD/VDD1

REGULATOR

IN

OSC

1.4MHz/
460KHz

RAMP

GENERATOR

V

LIMIT

R

R

S

OSC

Q

SWITCH/ LDO

SW

CS

CL

BOOSTRAP

REGULATOR

V

REF

BS

HICCUP

FB

CL

SS

SS

2A/V

SCHOTTKY

1pF

220k27pF

5

2

4

3

6

1

3.3V

1M

Package

Temperature

Range

Part Number

Marking ID

Packing

Type

SOT-23-6

-40 to 85C

AP3211HKTR-G1

GBK

Tape & Reel

TR: Tape & Reel

Preliminary Datasheet

Functional Block Diagram

Figure 3. Functional Block Diagram of AP3211H

Ordering Information

AP3211H -

Circuit Type G1: Green

Package
K: SOT-23-6

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant

and green.

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1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

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Parameter

Symbol

Value

Unit

Input Pin Voltage

VIN

-0.3 to 25

V

EN Pin Voltage

VEN

-0.3 to VIN+0.3

V

SW Pin Voltage

VSW

26

V

Bootstrap Pin Voltage

VBS

-0.3 to VSW+6

V

Feedback Pin Voltage

VFB

-0.3 to 6

V

Operating Junction Temperature

TJ

150

ºC

Storage Temperature

T

STG

-65 to 150

ºC

Lead Temperature
(Soldering, 10sec)

T

LEAD

260

ºC

Thermal Resistance
(Junction to Ambient)

θ

JA

220

ºC/W

Parameter

Symbol

Min

Max

Unit

Input Voltage

VIN

4.5

23

V

Operating Ambient Temperature

TA

-40

85

ºC

Preliminary Datasheet

Absolute Maximum Ratings (Note 1)

Note 1: Stresses greater than 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 Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

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1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

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Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Input Voltage

VIN

4.5 23

V

Quiescent Current

IQ

VFB=0.9V

0.8

1.1

mA

Shutdown Supply Current

I

SHDN

VEN=0V

0.1

1.0

µA

Feedback Voltage

VFB

0.785

0.810

0.835

V

Feedback Over Voltage Threshold

V

FBOV

0.972 V

Feedback Bias Current

IFB

VFB=0.85V

-0.1 0.1

µA

Switch On-resistance

R

DSON

ISW=1A

0.385 Ω

Switch Leakage Current

I

LEAK

VIN=23V,
VEN=0V

0.1

10

µA

Switch Current Limit

I

LIM

1.8

2.4 A

EN Pin Threshold

V

ENH

1.5 V V

ENL

0.4

Input UVLO Threshold

V

UVLO

VIN Rising

3.3

3.8

4.3

V

Input UVLO Hysteresis

V

HYS

0.2 V

Oscillator Frequency

f

OSC1

1.1

1.4

1.7

MHz

f

OSC2

Short Circuit

460

kHz

Max. Duty Cycle

D

MAX

VFB=0.6V

90 %

Min. Duty Cycle

D

MIN

VFB=0.9V

0 % Minimum On Time

tON

100 ns

Thermal Shutdown

T

OTSD

160 ºC

Thermal Shutdown Hysteresis

T

HYS

20 ºC

Soft-start Time

tSS

200 µs

Preliminary Datasheet

Electrical Characteristics

VIN=VEN=12V, V

=3.3V, TA=25ºC , unless otherwise specified.

OUT

Note 2: R

Jun. 2014 Rev. 2. 4 BCD Semiconductor Manufacturing Limited

DSON , tON, TOTSD, THYS

and t

are guaranteed by design.

SS

5

1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

PART OBSOLETE - USE AP3211 and AP5100

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0.01 0.1 1

0

10

20

30

40

50

60

70

80

90

100

Efficiency (%)

Output Current (A)

-60 -40 -20 0 20 40 60 80 100 120 140 160

0.68

0.72

0.76

0.80

0.84

0.88

0.92

0.96

1.00

Quiescent Current (mA)

Case Temperature (oC)

-60 -40 -20 0 20 40 60 80 100 120 140 160

0.40

0.48

0.56

0.64

0.72

0.80

0.88

0.96

Feedback Voltage (V)

Case Temperature (oC)

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

3.12

3.16

3.20

3.24

3.28

3.32

3.36

3.40

Output Voltage (V)

Output Current (A)

Preliminary Datasheet

Typical Performance Characteristics

TA=25ºC , VIN=12V, V

=3.3V, unless otherwise noted.

OUT

Figure 4. Efficiency vs. Output Current Figure 5. Quiescent Current vs. Case Temperature

Figure 6. Feedback Voltage vs. Case Temperature Figure 7. Output Voltage vs. Output Current

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1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

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VSW

(5V/div)

V

OUT_AC

(10mV/div)

IL

(500mA/div)

Time (400ns/div)

V

OUT_AC

(100mV/div)

Time (200s/div)

I

OUT

(500mA/div)

VSW

(5V/div)

VEN

(5V/div)

V

OUT

(2V/div)

Time (100s/div)

VSW

(5V/div)

VEN

(5V/div)

V

OUT

(2V/div)

Time (40s/div)

Preliminary Datasheet

Typical Performance Characteristics (Continued)

TA=25ºC , VIN=12V, V

=3.3V, unless otherwise noted.

OUT

Figure 8. Output Ripple (I

=1.5A) Figure 9. Load Transient (I

OUT

Figure 10. Enable Turn on Characteristic Figure 11. Enable Turn off Characteristic

=1A to 1.5A)

OUT

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VSW

(5V/div)

V

OUT

(2V/div)

IL

(1A/div)

Time (100s/div)

VSW

(5V/div)

V

OUT

(2V/div)

IL

(1A/div)

Time (100s/div)

Preliminary Datasheet

Typical Performance Characteristics (Continued)

TA=25ºC , VIN=12V, V

=3.3V, unless otherwise noted.

OUT

Figure 12. Short Circuit Protection (I

=1A) Figure 13. Short Circuit Recovery (I

OUT

OUT

=1A)

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1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

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R1

R2

49.9kΩ

16.2kΩ

IN

EN

BS

SW

FB

L1 4.7H

C1

10F

25V

VIN=12V

GND

CB

10nF

C2

22F

6.3V

D1

1

6

3

2

4

5

AP3211H

V

OUT

=3.3V

(1.5A)

ON OFF

Preliminary Datasheet

Typical Application

Figure 14. Typical Application Circuit of AP3211H

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1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

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2.820(0.111)

3.100(0.122)

2.650(0.104)

3.000(0.118)

1.500(0.059)

1.700(0.067)

0.950(0.037)TYP

1.800(0.071)

2.000(0.079)

0.300(0.012)

0.500(0.020)

0.700(0.028)REF

0.100(0.004)

0.200(0.008)

0°
8°

0.200(0.008)

0.300(0.012)

0.600(0.024)

0.000(0.000)

0.150(0.006)

0.900(0.035)

1.300(0.051)

1.450(0.057)
MAX

1 2 3

4

5

6

Pin 1 Mark

Preliminary Datasheet

Mechanical Dimensions

SOT-23-6 Unit: mm(inch)

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1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H

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E E

G

Z

Y

X

Dimensions

Z

(mm)/(inch)

G

(mm)/(inch)

X

(mm)/(inch)

Y

(mm)/(inch)

E

(mm)/(inch)

Value

3.600/0.142

1.600/0.063

0.700/0.028

1.000/0.039

0.950/0.037

Preliminary Datasheet

Mounting Pad Layout

SOT-23-6

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