ON Semiconductor CS5171, CS5172, CS5173, CS5174 Technical data

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CS5171, CS5172, CS5173,
CS5174

1.5 A 280 kHz/560 kHz
Boost Regulators

The CS5171/2/3/4 products are 280 kHz/560 kHz switching
regulators with a high efficiency, 1.5 A integrated switch. These parts
operate over a wide input voltage range, from 2.7 V to 30 V. The
flexibility of the design allows the chips to operate in most power
supply configurations, including boost, flyback, forward, inverting,
and SEPIC. The ICs utilize current mode architecture, which allows
excellent load and line regulation, as well as a practical means for
limiting current. Combining high frequency operation with a highly
integrated regulator circuit results in an extremely compact power
supply solution. The circuit design includes provisions for features
such as frequency synchronization, shutdown, and feedback controls
for either positive or negative voltage regulation. These parts are
pin−to−pin compatible with LT1372/1373.

Part Number Frequency Feedback Voltage Polarity

CS5171 280 kHz positive
CS5172 280 kHz negative
CS5173 560 kHz positive
CS5174 560 kHz negative

Features

• Pb−Free Packages are Available

• Integrated Power Switch: 1.5 A Guaranteed

• Wide Input Range: 2.7 V to 30 V

• High Frequency Allows for Small Components

• Minimum External Components

• Easy External Synchronization

• Built in Overcurrent Protection

• Frequency Foldback Reduces Component Stress During an

Overcurrent Condition

• Thermal Shutdown with Hysteresis

• Regulates Either Positive or Negative Output Voltages

• Shut Down Current: 50 A Maximum

• Pin−to−Pin Compatible with LT1372/1373

• Wide Temperature Range

♦ Industrial Grade: −40°C to 125°C
♦ Commercial Grade: 0°C to 125°C

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SOIC−8

D SUFFIX

CASE 751

PIN CONNECTIONS AND

MARKING DIAGRAM

CS5171/3

1

V

C

SS

CS5172/4

1

V

C

SS

x = 1, 2, 3, or 4
x = E, G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week

See detailed ordering and shipping information in the
package dimensions section on page 17 of this data sheet.

ORDERING INFORMATION

ALYW

ALYW

517xx

517xx

8

V

SW

PGNDFB
AGNDTest
V

CC

8

V

SW

PGNDTest
AGNDNFB
V

CC

 Semiconductor Components Industries, LLC, 2004

June, 2004 − Rev. 20

1 Publication Order Number:

CS5171/D

0.01 F

SS

3.3 V

C1

CS5171, CS5172, CS5173, CS5174

R2

3.72 k

1

V

C

2

FB

3

Test

45

SS

PGND

AGND

CS5171/3

8

V

SW

7

6

L1

V

CC

22 H

D1

MBRS120T3

+

V

OUT

C3
22 F

5 V

R1
5 k

R3

1.28 k

+

C2

22 F

Figure 1. Applications Diagram

MAXIMUM RATINGS

Rating Value Unit

Junction Temperature Range, T
Storage Temperature Range, T

J

STORAGE

Package Thermal Resistance: Junction−to−Case, R

Junction−to−Ambient, R



JC



JA

−40 to +150 °C

−65 to +150 °C
45

165

°C/W
°C/W

Lead Temperature Soldering: Reflow (Note 1) 230 Peak °C
ESD, Human Body Model 1.2 kV

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously . If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.

1. 60 second maximum above 183°C.

MAXIMUM RATINGS

Pin Name Pin Symbol V

IC Power Input V

CC

MAX

30 V −0.3 V N/A 200 mA

Shutdown/Sync SS 30 V −0.3 V 1.0 mA 1.0 mA

V

MIN

I

SOURCE

I

SINK

Loop Compensation V
Voltage Feedback Input FB

C

6.0 V −0.3 V 10 mA 10 mA
10 V −0.3 V 1.0 mA 1.0 mA

(CS5171/3 only)

Negative Feedback Input
(transient, 10 ms)

NFB

(CS5172/4 only)

−10 V 10 V 1.0 mA 1.0 mA

Test Pin Test 6.0 V −0.3 V 1.0 mA 1.0 mA
Power Ground PGND 0.3 V −0.3 V 4 A 10 mA
Analog Ground AGND 0 V 0 V N/A 10 mA
Switch Input V

SW

40 V −0.3 V 10 mA 3.0 A

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CS5171, CS5172, CS5173, CS5174

ELECTRICAL CHARACTERISTICS (2.7 V< V

Commercial Grade: 0°C < T

Characteristic

< 125°C; For all CS5171/2/3/4 specifications unless otherwise stated.)

J

< 30 V; Industrial Grade: −40°C < TJ < 125°C;

CC

Test Conditions Min Typ Max Unit

Positive and Negative Error Amplifiers

FB Reference Voltage (CS5171/3 only) VC tied to FB; measure at FB 1.246 1.276 1.300 V
NFB Reference Voltage (CS5172/4 only) VC = 1.25 V −2.55 −2.45 −2.35 V
FB Input Current (CS5171/3 only) FB = V

REF

NFB Input Current (CS5172/4 only) NFB = NV
FB Reference Voltage Line Regulation

VC = FB − 0.01 0.03 %/V

REF

−1.0 0.1 1.0 A

−16 −10 −5.0 A

(CS5171/3 only)
NFB Reference Voltage Line Regulation

VC = 1.25 V − 0.01 0.05 %/V

(CS5172/4 only)
Positive Error Amp Transconductance IVC = ± 25 A 300 550 800 Mho
Negative Error Amp Transconductance IVC = ± 5 A 115 160 225 Mho
Positive Error Amp Gain (Note 2) 200 500 − V/V
Negative Error Amp Gain (Note 2) 100 180 320 V/V
VC Source Current FB = 1.0 V or NFB = −1.9 V, VC = 1.25 V 25 50 90 A
VC Sink Current FB = 1.5 V or NFB = −3.1 V, VC = 1.25 V 200 625 1500 A
VC High Clamp Voltage FB = 1.0 V or NFB = −1.9 V;

V

sources 25 A

C

1.5 1.7 1.9 V

VC Low Clamp Voltage FB = 1.5 V or NFB = −3.1 V, VC sinks 25 A 0.25 0.50 0.65 V
VC Threshold Reduce VC from 1.5 V until switching stops 0.75 1.05 1.30 V

Oscillator

Base Operating Frequency CS5171/2, FB = 1 V or NFB = −1.9 V 230 280 310 kHz
Reduced Operating Frequency CS5171/2, FB = 0 V or NFB = 0 V 30 52 120 kHz
Maximum Duty Cycle CS5171/2 90 94 − %
Base Operating Frequency CS5173/4, FB = 1 V or NFB = −1.9 V 460 560 620 kHz
Reduced Operating Frequency CS5173/4, FB = 0 V or NFB = 0 V 60 104 160 kHz
Maximum Duty Cycle CS5173/4 82 90 − %
NFB Frequency Shift Threshold Frequency drops to reduced operating frequency −0.80 −0.65 −0.50 V
FB Frequency Shift Threshold Frequency drops to reduced operating frequency 0.36 0.40 0.44 V

Sync/ Shutdown

Sync Range CS5171/2 320 − 500 kHz
Sync Range CS5173/4 640 − 1000 kHz
Sync Pulse Transition Threshold Rise time = 20 ns 2.5 − − V
SS Bias Current SS = 0 V

SS = 3.0 V

−15−−3.0

3.0

8.0

−

A
A

Shutdown Threshold − 0.50 0.85 1.20 V
Shutdown Delay 2.7 V ≤ VCC ≤ 12 V

12 V < V

≤ 30 V

CC

12
12

80
36

350
200

s
s

2. Guaranteed by design, not 100% tested in production.

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3

CS5171, CS5172, CS5173, CS5174

ELECTRICAL CHARACTERISTICS (continued) (2.7 V< V

Commercial Grade: 0°C < T

< 125°C; For all CS5171/2/3/4 specifications unless otherwise stated.)

J

< 30 V; Industrial Grade: −40°C < TJ < 125°C;

CC

Characteristic UnitMaxTypMinTest Conditions

Power Switch

I

Switch Saturation Voltage

= 1.5 A, (Note 3)

SWITCH

I

= 1.0 A, 0°C ≤ TJ ≤ 85°C

SWITCH

I

= 1.0 A, −40°C ≤ TJ ≤ 0°C

SWITCH

I

= 10 mA

SWITCH

Switch Current Limit 50% duty cycle, Note 3

80% duty cycle, Note 3

1.6

1.5

−

−

−

−

0.8

0.55

0.75

0.09

1.9

1.7

1.4

−

−

0.45

2.4

2.2
Minimum Pulse Width FB = 0 V or NFB = 0 V, ISW = 4.0 A, (Note 3) 200 250 300 ns
ICC/ IV

SW

2.7 V ≤ VCC ≤ 12 V, 10 mA ≤ISW ≤ 1.0 A
12 V < V

2.7 V ≤ V
12 V < V

≤ 30 V, 10 mA ≤ISW ≤ 1.0 A

CC

≤ 12 V, 10 mA ≤ISW ≤ 1.5 A, (Note 3)

CC

≤ 30 V, 10 mA ≤ISW ≤ 1.5 A, (Note 3)

CC

−

−

−

−

10

17

30

−

100

30

−

100

Switch Leakage VSW = 40 V, VCC = 0V − 2.0 100 A

General

Operating Current
Shutdown Mode Current VC < 0.8 V, SS = 0 V, 2.7 V ≤ VCC ≤ 12 V

Minimum Operation Input Voltage VSW switching, maximum I

ISW = 0 − 5.5 8.0 mA

V

< 0.8 V, SS = 0 V, 12 V ≤ VCC ≤ 30 V

C

10 mA − 2.45 2.70 V

SW =

−

−

12

60

−

100

Thermal Shutdown (Note 3) 150 180 210 °C
Thermal Hysteresis (Note 3) − 25 − °C

3. Guaranteed by design, not 100% tested in production.

V
V
V
V

A
A

mA/A
mA/A
mA/A
mA/A

A

PACKAGE PIN DESCRIPTION

Package

Pin #

1 V

2

(CS5171/3

only)

2

(CS5172/4)

3

(CS5171/3)

3

(CS5172/4)

4 SS Synchronization and shutdown pin. This pin may be used to synchronize the part to nearly twice the base

5 V

6 AGND Analog ground. This pin provides a clean ground for the controller circuitry and should not be in the path of

7 PGND Power ground. This pin is the ground connection for the emitter of the power switching transistor. Connection

8 V

Pin

Symbol

C

Loop compensation pin. The V
current limit and soft start. Loop compensation can be implemented by a simple RC network as shown in the

pin is the output of the error amplifier and is used for loop compensation,

C

Function

application diagram on page 2 as R1 and C1.

FB Positive regulator feedback pin. This pin senses a positive output voltage and is referenced to 1.276 V. When

the voltage at this pin falls below 0.4 V, chip switching frequency reduces to 20% of the nominal frequency.

Test These pins are connected to internal test logic and should either be left floating or tied to ground. Connection

to a voltage between 2 V and 6 V shuts down the internal oscillator and leaves the power switch running.

NFB Negative feedback pin. This pin senses a negative output voltage and is referenced to −2.5 V. When the volt-

age at this pin goes above −0.65 V, chip switching frequency reduces to 20% of the nominal frequency.

frequency. A TTL low will shut the part down and put it into low current mode. If synchronization is not used,
this pin should be either tied high or left floating for normal operation.

Input power supply pin. This pin supplies power to the part and should have a bypass capacitor connected to

CC

AGND.

large currents. The output voltage sensing resistors should be connected to this ground pin. This pin is con­nected to the IC substrate.

to a good ground plane is essential.
High current switch pin. This pin connects internally to the collector of the power switch. The open voltage

SW

across the power switch can be as high as 40 V. To minimize radiation, use a trace as short as practical.

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4

V

CC

SS

NFB

CS5172/4

only

FB

CS5171/3

only

250 k

Shutdown

Delay
Timer

200 k

2.0 V

1.276 V

CS5171, CS5172, CS5173, CS5174

Thermal

Shutdown

2.0 V

Regulator

PWM

S

Latch

+

Sync

Negative
Error Amp

+

−

−0.65 V Detector

0.4 V Detector

−
+

Positive
Error Amp

Oscillator

Frequency

Shift 5:1

Q

R

Slope
Compensation

PWM
Comparator

−

Driver

Ramp
Summer

×5

Switch

63 m

V

SW

PGND

AGND

V

C

Figure 2. Block Diagram

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CS5171, CS5172, CS5173, CS5174

TYPICAL PERFORMANCE CHARACTERISTICS

7.2

7.0

6.8

6.6

6.4

6.2

6.0

Current (mA)

5.8

5.6
0

Temperature (°C)

50 100

Figure 3. ICC (No Switching) vs. Temperature

1200
1000

800

(mV)

600

CE(SAT)

400

V

200

0

500 1000

I

SW

(mA)

VCC = 30 V

VCC = 12 V

VCC = 2.7 V

−40 °C
85 °C

25 °C

70
60
50

40

(mA/A)

30
20

10

0

1.9

1.8

(V)

1.7

IN

V

1.6

1.5

VCC = 30 V

ISW = 1.5 A

VCC = 12 V

VCC = 2.7 V

0

Temperature (°C)

50 100

Figure 4. ICC/ IVSW vs. Temperature

0 10050

Temperature (°C)

285
280
275
270

(kHz)

OSC

265

f

260
255

Figure 5. V

0 10050

Temperature (°C)

CE(SAT)

vs. I

SW

Figure 7. Switching Frequency vs. Temperature

(CS5171/2 only)

Figure 6. Minimum Input V oltage vs. Temperature

570
565

560
555

550

(kHz)

545

OSC

f

540
535
530
525
520

0 10050

Temperature (°C)

Figure 8. Switching Frequency vs. Temperature

(CS5173/4 only)

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CS5171, CS5172, CS5173, CS5174

TYPICAL PERFORMANCE CHARACTERISTICS

VCC = (12 V)

100

−40°C

75

50

(% of Typical)

OSC

25

f

0

350

25°C

380 400 420 450

V

(mV)

FB

Figure 9. Switching Frequency vs. V

(CS5171/3 only)

1.280

1.278

1.276

1.274

Voltage (V)

1.272

1.270

1.268

VCC = 2.7 V

0 10050

Temperature (°C)

Figure 11. Reference Voltage vs. Temperature

(CS5171/3 only)

85°C

FB

VCC = 12 V

VCC = 30 V

VCC = (12 V)

100

85°C

75

50

(% of Typical)

OSC

f

25

25°C

0

−550

−660

V

(mV)

NFB

Figure 10. Switching Frequency vs. V

(CS5172/4 only)

−2.42

−2.43

−2.44

−2.45

Voltage (V)

−2.46

−2.47

−2.48

= 12 V

V

CC

0 10050

Temperature (°C)

V

CC

Figure 12. Reference Voltage vs. Temperature

(CS5172/4 only)

−40°C

−725

NFB

= 30 V

VCC = 2.7 V

0.20

0.18

0.16

(A)

0.14

FB

I

0.12

0.10

0.08

Figure 13. I

= 12 V

V

CC

V

= 2.7 V

CC

0 10050

Temperature (°C)

vs. Temperature (CS5171/3 only)

FB

−7

−8

−9

−10

(A)

−11

NFB

I

−12

−13

−14

Figure 14. I

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7

0 50 100

Temperature (°C)

vs. Temperature (CS5172/ 4 only)

NFB