iC-DC

2-CHANNEL BUCK/BOOST DC/DC CONVERTER

Rev B1, Page 8/19

ELECTRICAL CHARACTERISTICS

Operating conditions: VB = +4 V to +36 V, RREF = 20 kΩ ±1 %, Tj = -40°C to +125°C, reference is GND (GNDA = GND),

unless otherwise stated.

Item

Symbol

Parameter

Conditions

Unit

No.

Min.

Typ.

Max.

203 Vt1()hys

Hysteresis VBR

Vt1()hys = Vt1()hi − Vt1()lo

300

600

mV

204 Vt2()hi

Overvoltage Detection at VBR

VBR increasing,

VBROK: open → lo

40.4

42

V

205 Vt2()lo

Reset Overvoltage Detection at

VBR

VBR decreasing,

VBROK: lo → open

35

37.6

V

206 Vt2()hys

Hysteresis VBR

Vt2()hys = Vt2()hi − Vt2()lo

1

2.8

4

V

210 Vs()lo

Saturation Voltage lo at VBROK

I(VBROK) = 5 mA, VBROK = lo

0.4

V

211 Isc()lo

Short-Circuit Current lo in

VBROK

V(VBROK) = 2..8 V, VBROK = lo

50

mA

212 Ilk()

Leakage Current in VBROK

V(VBROK) = 0..8 V, VBROK = hi

-10

10

µA

213 V(VBR)

Minimal Supply Voltage for

VBROK Function

I(VBROK) = 5 mA, VBROK = lo,

Vs(VBROK)lo < 0.4 V

3.3

V

Switching Regulator VH, VH1, VH2

305 V()

Voltage at VH

LVBH = 22 µH ±20 %, Ri(LVBH) < 1.1 Ω,

CVH = 1 µF;

VB ≤ 5 V, I(VH) = -50 mA,

7

7.75

8

V

VB > 5 V, I(VH) = -100 mA,

7.25

7.75

8

V

VB ≥ 12 V, I(VH) = -200 mA,

7.25

7.75

8

V

VB ≥ 24 V, I(VH) = -300 mA

7.25

7.75

8

V

307 CVH

Required Capacitor at VH

tolerance ±30 %

1

4.7

µF

308 RiVH

Permissible Internal Resistance

of Capacitor at VH

1

Ω

309 V()

Voltage at VH1

versus VCC1, CVH1 = 1 µF,

300

400

600

mV

VB ≤ 5 V, I(VH1) = -50 mA,

VB > 5 V, I(VH1) = -100 mA,

VB ≥ 12 V, I(VH1) = -200 mA,

VB ≥ 24 V, I(VH1) = -300 mA

311 CVH1

Required Capacitor at VH1

tolerance ±30 %

2.2

10

µF

312 RiCVH1

Permissible Internal Resistance

of Capacitor at VH1

1

Ω

313 V()

Voltage at VH2

versus VCC2, CVH2 = 1 µF,

300

400

600

mV

VB ≤ 5V, I(VH2) = -50 mA,

VB > 5 V, I(VH2) = -100 mA,

VB ≥ 12 V, I(VH2) = -200 mA,

VB ≥ 24 V, I(VH2) = -300 mA

315 CVH2

Required Capacitor at VH2

tolerance ±30 %

2.2

10

µF

316 RiCVH2

Permissible Internal Resistance

of Capacitor at VH2

1

Ω

330 ηVH

Efficiency of Switching Converter

VH

VB = 4 V, V(VH) > 7 V, VB = VBR,

VH1 > VCC1 + 800 mV, VH2 > VCC2 + 800 mV

70

%

331 ηVH

Efficiency of Switching Converter

VH

VB = 6.5 V, V(VH) > 7 V, VB = VBR,

VH1 > VCC1 + 800 mV, VH2 > VCC2 + 800 mV

80

%

332 ηVH1

Efficiency of Switching Converter

VH1

VB = 4 V, V(VH) > 8.1 V, VB = VBR,

ENV1 = hi, ENV2 = lo

70

%

333 ηVH1

Efficiency of Switching Converter

VH1

80

%

334 ηVH2

Efficiency of Switching Converter

VH2

VB = 4 V, V(VH) > 8.1 V, VB = VBR,

ENV1 = lo, ENV2 = hi

70

%

335 ηVH2

Efficiency of Switching Converter

VH2

VB = 6.5 V, V(VH) > 8.1 V, VB = VBR,

ENV1 = lo, ENV2 = hi

80

%

Bias, Oscillator and Reference RREF

401 V(RREF)

Voltage at RREF

resistor RREF = 20 kΩ ±1 %,

resistor RREF versus GNDA

1.16

1.24

1.32

V

402 R(RREF)

Permissible Resistor at RREF

±1 %

19.6

34

kΩ

403 Isc(RREF) Short-Circuit Current lo in RREF V(RREF) = 0 V

-3

-0.5

mA