无电感升压芯片,外围仅3个电容,PS3120A.docx

PS3120A无电感升压芯片，适用在小电流供电应用上。
PS3120A代理：深圳市百盛新纪元半导体有限公司

PULAN TECHNOLOGY CO., LIMITED
PS3120A

Description

The PS3120A is a low no ise switched capacitor voltage doubler. It produces a regulated output voltage from a 2.7V to 4.5V input. Low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the PS3120A ideally suited for small, battery-powered applications.

The PS3120A have thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to <1ìA.

The PS3120A is available in the industry standard SOT-23-6L power packages.
Features

Ø Fixed 4.94V±3% Output
Ø VIN Range: 2.7V to 4.5V 设计应用：
Ø Output Current: Up to 110mA (VIN≥3V) Up to 230mA (VIN≥3.6V)
Ø Low Noise Constant Frequency (360kHz) Operation
Ø Shutdown Current <1ìA
Ø No Inductors
Ø Available in Low Profile 6-Lead SOT23
Package

Applications

Ø White LED Backlighting
Ø Li-Ion Battery Backup Supplies
Ø Smart Card Readers
Ø PCMCIA Local 5V Supplies

Typical Application

外围超简单，不需要电感，不需要整流二极管，仅需要三个电容。
代理：深圳市百盛新纪元半导体有限公司
C FLY 10µF

4 6
C- C+

DC+
5 1 VOUT

VIN
VOUT

2.7V ~ 4.5V 4.94V

CIN
10µF


3
ON OFF
PS3120A

EN
GND
2

COUT
10µF

Figure 1: Regulated 4.94V Output

PS3120A-GV2.3 PULAN TECHNOLOGY 1

PS3120A
PULAN TECHNOLOGY CO., LIMITED

Pin Assignment and Description

6 5 4

1 2 3
SOT-23-6L

PIN

NAME

DESCRIPTION

1

VOUT

Output

2

GND

Ground

3

EN

ON/OFF Control (High Enable)

4

C-
Flying Capacitor Negative Terminal.

5

VIN

Input

6

C+

Flying Capacitor Positive Terminal.

Absolute Maximum Ratings (Note 1)

Ø VIN ……………………………….…………………………….…….….…..….………-0.3V ～ 6V
Ø VOUT ………………………………………………………………………………….….-0.3V ～ 5.5V
Ø V EN ……………………………………………………...………………… ….…...……-0.3V ～ 6V
Ø IOUT (Note 2) …………………….................................………………………...................... 300mA
Ø Operating Temperature Range (Note 3)…………………………………………...……-40℃ ～ +85℃
Ø Lead Temperature (Soldering 10, sec.) ……………………………………..………………+265℃
Ø Storage Temperature Range ………………………………………………..…..-65℃ ～ +125℃

Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability.

Note 2: Based on long term current density limitations.
Note 3: The PS3120A are guaranteed to meet perfo rmance specifications from 0　C to 70　C. Specifications over the
–40　C to 85　C operating temperature range are assured by design, characterization and correlation with statistical
process controls.

PULAN TECHNOLOGY
PS3120A-GV2.3
4

Electrical Characteristics

Operating Conditions: TA = 25 ℃, VEN = VIN, CIN = COUT = CFLY = 10ìF, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Input Voltage Range

2.7

4.5

V

VOUT

Output Voltage Range
2.7V <VIN < 5.5V, IOUT <
65mA

4.8

4.94

5.1

V

ISHDN

Shutdown Current

VEN = 0V,VOUT = 0V

0.2

ìA

INO-LOAD

No Load Input Current

IOUT = 0mA, VIN = 3V

0.17

mA

VRIPPLE

Output Ripple

VIN = 3.6V , IOUT = 100mA

20

mVP-P

EFFI

Efficiency

VIN = 3V, IOUT =100mA

78

%

fOSC

Switching Frequency

VIN = 3.6V , IOUT = 100mA

360

kHz

VEN

EN Voltage

High Enable

VIN/2

V

Typical Performance Characteristics
Operating Conditions: TA=25℃, VEN = VIN, CIN = COUT = CFLY = 10ìF, unless otherwise noted.

Efficiency vs. Output Current
90

80 VIN=3V

Output Voltage (V)
70 VIN=3.6V


5

4.9

4.8
Output Voltage vs. Output Current

60

50

40 VIN=4.2V
30

20

10

0
4.7

4.6

4.5

4.4

4.3

4.2

4.1

4

VIN

=3V
VIN=3.6V

VIN=4.2V

50 100 150 200 250 300

Output Current (mA)
50 100 150 200 250 300

Output Current (mA)

Efficiency (%)

5.2

5.1

5

Output Voltage (V)
4.9

4.8

4.7

4.6

4.5

4.4

4.3

4.2
Output Voltage vs. Supply Voltage
(ILOAD=0mA)

2.5 2.9 3.3 3.7 4.1 4.5

Supply Voltage (V)
Supply Current vs. Supply Voltage
(ILOAD=0mA)
7

6

Supply Current (mA)
5

4

3

2

1

0
2.5 2.9 3.3 3.7 4.1 4.5
Supply Voltage (V)

PS3120A-GV2.3
PULAN TECHNOLOGY
8

500

450

Oscillator Frequency (kHz)
400

350

300

250

200

150

100

50

0
Oscillator Frequency vs.Supply Voltage
(ILOAD=100mA)

2.5 2.9 3.3 3.7 4.1 4.5

Supply Voltage (V)

Output Noise（VIN=3.6V, ILOAD=100mA） SW Noise（VIN=3.6V, ILOAD=100mA）

Output Noise（VIN=4.2V, ILOAD=100mA） SW Noise（VIN=4.2V, ILOAD=100mA）

Pin Functions

VOUT (Pin 1): Regulated Output Voltage. VOUT should be bypassed with a low ESR ceramic capacitor providing at least 2.2ìF of capacitance as close to the pin as possible for best performance.

GND (Pin 2): Ground. These pins should be tied to a ground plane for best performance.

EN (Pin 3): Active Low Shutdown Input. This pin must not be allowed to float.

C- (Pin 4): Flying Capacitor Negative Terminal.

VIN (Pin 5): Input Supply Voltage. VIN should be bypassed with a low ESR ceramic capacitor providing at least 2.2ìF of capacitance as close to the pin as possible for best performance.

C+ (Pin 6): Flying Capacitor Positive Terminal.

Block Diagram

Application Information

Operation

The PS3120A use a switched capacitor charge pump to boost VIN to a regulated output voltage. Regulation is achieved by sensing the output voltage through an internal resistor divider and modulating the charge pump output current based on the error signal. A 2-phase nonoverlapping clock activates the charge pump switches. The flying capacitor is charged from VIN on the first phase of the clock. On the second phase of the clock it is stacked in series with VIN and connected to VOUT. This sequence of charging and discharging the flying capacitor continues at a free running frequency of 360kHz (typ).

In shutdown mode all circuitry is turned off and the PS3120A draw only leakage current from the VIN supply. Furthermore, VOUT is disconnected from VIN. The EN pin is a CMOS input with a threshold voltage of approximately 0.8V. The PS3120A is in s hutdown when a logic low is applied to the EN pin. Since the EN pin is high impedance CMOS input it should never be allowed to float. To ensure that its state is defined it must always be driven with a valid logic level.

VIN, VOUT Capacitor Selection

The style and value of capacitors used with the PS3120A determine seve ral important parameters such as regulator control loop stability, output ripple, charge pump strength and minimum start-up time.

To reduce noise and ripple, it is recommended that low ESR (< 0.1Ω) ceramic capacitors be used for both CIN and COUT. These capacitors should be greater than 2.2ìF. Tantalum and aluminum capacitors are not recommended because of their high ESR.

Flying Capacitor Selection

Warning: A polarized capacitor such as tantalum or aluminum should never be used for the flying capacitor since its voltage can reverse upon start-up of the PS3120A . Low ESR ceramic capacitors should always be used for the flying capacitor.

The flying capacitor controls the strength of the charge pump. In order to achieve the rated output current it is necessary to have more than 2.2ìF of capacitance for the flying capacitor.

Layout Considerations

Due to its high switching frequency and the high transient currents produced by the PS3120A, careful board layout is necessary. A true ground plane and short connections to all capacitors will improve performance and ensure proper regulation under all conditions. Figure 2 shows an example layout for the PS3120A.

Figure 2: Recommended Layout

Packaging Information

SOT-23-6L Package Outline Dimension

Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
1.050
1.250
0.041
0.049
A1
0.000
0.100
0.000
0.004
A2
1.050
1.150
0.041
0.045
b
0.300
0.500
0.012
0.020
c
0.100
0.200
0.004
0.008
D
2.820
3.020
0.111
0.119
E
1.500
1.700
0.059
0.067
E1
2.650
2.950
0.104
0.116
e
0.950(BSC)
0.037(BSC)
e1
1.800
2.000
0.071
0.079
L
0.300
0.600
0.012
0.024
è
0°
8°
0°
8°

PS3120A-GV2.3
PULAN TECHNOLOGY
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