High-Efficiency, PWM, Step-Down

DC-DC Controllers in 16-Pin QSOP

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3

Note 1: Since the reference uses VL as its supply, V+ line-regulation error is insignificant.

Note 2: At very low input voltages, quiescent supply current may increase due to excessive PNP base current in the VL linear

regulator. This occurs if V+ falls below the preset VL regulation point (5V nominal).

ELECTRICAL CHARACTERISTICS (continued)

SECFB, 0 or 4V

SHDN, 0 or 30V

SHDN, SKIP

SYNC

SYNC = 0 or 5V

SYNC = REF

Guaranteed by design, not tested

CSH = CSL = 5.5V

V+ = 4.5V, CSH = CSL = 4.0V (Note 2)

SYNC = 0 or 5V

Falling edge

SYNC = REF

SHDN = 0V, CSL = 5.5V, CSH = 5.5V, V+ = 0 or 30V,

VL = 0V

CONDITIONS

0.1

µA

3.0

No external load (Note 1)

Input Current

2.0

V

VL - 0.5

Input High Voltage

%

98

99

97

98

Dropout-Mode Maximum Duty

Cycle

kHz

190

340

Oscillator Sync Range

ns

200

SYNC Rise/Fall Time

ns

200

SYNC Low Pulse Width

ns

200

SYNC High Pulse Width

125

150

175

kHz

270

300

330

Oscillator Frequency

2.46

2.50

2.54

1

2

Quiescent Power Consumption

1

8

Dropout Power Consumption

5

15

V+ Shutdown Current

V

2.0

2.4

Reference Fault Lockout Voltage

mV

15

Reference Load Regulation

µA

0.1

1

CSL, CSH Shutdown Leakage

Current

UNITS

MIN

TYP

MAX

PARAMETER

SHDN = 0V, V+ = 30V, CSL = 0 or 5.5V

FB = CSH = CSL = 5.5V, VL switched over to CSL

V+ Off-State Leakage Current

DL forced to 2V

FB, FB = REF

CSH, CSL, CSH = CSL

≤ 4V

SYNC, SKIP

A

1

DL Sink/Source Current

±0.1

70

1.0

SHDN, SKIP

SYNC

0.5

V

0.8

Input Low Voltage

DH forced to 2V, BST - LX = 4.5V

A

1

DH Sink/Source Current

High or low, BST - LX = 4.5V

High or low

Ω

1.5

5

DH On-Resistance

Ω

1.5

5

DL On-Resistance

Reference Output Voltage

V

OSCILLATOR AND INPUTS/OUTPUTS

3

7

5

15

µA

µA

mW

mW