Product # PQ24018QGA25

Phone 1-888-567-9596

Doc.# 005-2QG218D_A

3/1/02

Page 3

Technical Specification

24Vin 1.8Vout 25A

Quarter

Quarter

Brick

Brick

PARAMETER

NOTES and CONDITIONS

PQ24018QGA25

Min.

Typ.

Max.

Units

INPUT CHARACTERISTICS

Operating Input Voltage Range

18

24

36

V

Input Under-Voltage Lockout

Turn-On Voltage Threshold

15.5

16.0

16.5

V

Turn-Off Voltage Threshold

14.0

14.5

15.0

V

Lockout Hysteresis Voltage

1.0

1.5

2.0

V

Maximum Input Current

100% Load, 18Vin

3.0

A

No-Load Input Current

60

100

mA

Off Converter Input Current

1.6

3

mA

Input Reflected-Ripple Current

P-P thru 3.3µH inductor; Figures 13 & 15

6

mA

OUTPUT CHARACTERISTICS

Output Voltage Set Point

1.782

1.800

1.816

V

Output Voltage Regulation

Over Line

+0.1 (2)

+0.3 (5)

% (mV)

Over Load

+0.1 (2)

+0.3 (5)

% (mV)

Over Temperature

+9

+27

mV

Total Output Voltage Range

over sample line, load and temperature

1.75

1.85

V

Output Voltage Ripple and Noise

20MHz bandwidth; Figures 13 & 16

Peak-to-Peak

Full Load, 1µF ceramic, 10µF tantalum

25

50

mV

RMS

Full Load, 1µF ceramic, 10µF tantalum

612

mV

Operating Output Current Range

025

A

Output DC Current-Limit Inception

Output Voltage 10% Low; Fig. 17 & 18

26

30

34

A

Short-Circuit Protection (redundant shutdown)

52

56

60

A

DYNAMIC CHARACTERISTICS

Input Voltage Ripple Rejection

120 Hz; Figure 20

TBD

dB

Output Voltage Current Transient

470µF load cap, 5A/µs; Figure 12

Positive Step Change in Output Current

50% Io to 75% Io

190

mV

Negative Step Change in Output Current

75% Io to 50% Io

190

mV

Settling Time to within 1% Vout nominal

700

µs

Turn-On Transient

Turn-On Time

Full load, Vout=90% nom.; Figs 9 & 10

1

4

8

ms

Start-Up Inhibit Period

-40°C to +125°C; Figure F

180

200

215

ms

Maximum Output Capacitance

35,000

µF

EFFICIENCY

100% Load

Figure 1

84

%

50% Load

87

%

TEMPERATURE LIMITS FOR POWER DERATING CURVES

Semiconductor Junction Temperature

Plastic Package rated to 150°C

125

°C

Board Temperature

Board rated to 165°C

125

°C

Transformer Temperature

Figures 5 - 8

125

°C

ISOLATION CHARACTERISTICS

Isolation Voltage

2000

V

Isolation Resistance

10

M

Ω

Isolation Capacitance

470

pF

FEATURE CHARACTERISTICS

Switching Frequency

220

240

260

kHz

ON/OFF Control (Option P)

Off-State Voltage

-2

0.8

V

On-State Voltage

2.4

18

V

ON/OFF Control (Option N)

Off-State Voltage

2.4

18

V

On-State Voltage

-2

0.8

V

ON/OFF Control (Either Option)

Pull-Up Voltage

See circuit diagram; Figure B

Vin/3

9.6

V

Pull-Up Resistance

Pull up to Vin/3

33

k

Ω

Output Voltage Trim Range

Across Pins 8 & 4; Figures C & D

-20

+10

%

Output Over-Voltage Protection

Over full temp range; % of nominal Vout

117

122

127

%

Over-Temperature Shutdown

Average PCB Temperature

125

°C

PQ24018QGA25 ELECTRICAL CHARACTERISTICS

+115°C ambient temperature with appropriate power derating. Specifications subject to change without notice.

Patents: SynQor is protected under various patents, including but not limited to U.S. Patent # 5,999,417.