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A4407

2.2 MHz Constant On-Time Buck Regulator With Two External and Two Internal Linear Regulators

Allegro MicroSystems 

A4407

2.2 MHz Constant On-Time Buck Regulator

With Two External and Two Internal Linear Regulators

ELECTRICAL CHARACTERISTICS (continued) Valid at 5.5 V < VIN < 36 V, −40ºC < TJ < 150ºC; unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Buck Switching Regulator (VREG) (continued)

Current Feedback Gain2

Error Amplifier Transconductance2

Error Amplifier Open Loop Gain2

0 dB Crossover Frequency2

Soft Start Ramp Time

5 V and 5VP Linear Regulators

GISEN

gm

AVOL

fC

tSS

VIN = 13.5 V, RSENSE = 300 mΩ, CO = 10 μF,

RL = 5.5 Ω

–

4.0

–

V/V

–

7.5

–

μA/V

–

57

–

dB

–

65

–

kHz

–

10

–

ms

V5 Accuracy and Load Regulation

V5P Accuracy and Load Regulation

V5P/3V3 Tracking Ratio

V5P/3V3 Tracking Accuracy

errV5

errV5P

errTrack3V3

V5P/V5 Tracking Accuracy3

errTrackV5

3.3 V Linear Regulator and FET Driver

10 mA < IV5 < 215 mA, VREG ≥ 5.25 V

10 mA < IV5P < 280 mA, VREG ≥ 5.25 V

VV5P / V3V3

2.69 V < V3V3 < 3.37 V, IV5P = 75 mA,

5.5 V < VIN < 27 V

IV5P = IV5 = 75 mA, 5.5 V < VIN < 27 V,

–20°C < TJ < 150°C

IV5P = IV5 = 75 mA, 5.5 V < VIN < 27 V,

TJ = –40°C

4.9

5.0

5.1

V

4.9

5.0

5.1

V

1.507

1.515

1.523

–

−0.5

–

+0.5

%

−25

–

+25

mV

−32

–

+32

mV

3V3 Accuracy

err3V3 10 mA < I3V3 < 700 mA

3V3 Input Resistance

RIN3V3

G3V3 Source Current1

IG3V3(SRC) V3V3 = 3.0 V, VG3V3 = VG3V3(MAX) – 1 V

G3V3 Sink Current1

IG3V3(SINK) V3V3 = 3.6 V, VG3V3 = 6 V

G3V3 Maximum Voltage

VG3V3(MAX) V3V3 = 3.0 V

G3V3 Minimum Voltage

VG3V3(MIN) V3V3 = 3.6 V

G3V3 Output Impedance2

ROUT(G3V3)

3V3 External FET Gate Capacitance2 CISS3V3

1.2 V/1.5 V/1.8 V Linear Regulator and FET Driver

3.23

3.30

3.37

V

–

300

–

kΩ

−160

−320

–480

μA

0.5

4

–

mA

9

–

15

V

–

0.7

1.0

V

–

175

–

Ω

250

–

5200

pF

1V2 Accuracy

1V2 Bias Current1

G1V2 Source Current1

G1V2 Sink Current1

G1V2 Maximum Voltage

G1V2 Minimum Voltage

G1V2 Output Impedance2

1V2 External FET Gate Capacitance2

Charge Pump (VCP)

err1V2 10 mA < I1V2 < 500 mA

I1V2

IG1V2(SRC) V1V2 = 0.9 V, VG1V2 = VG1V2(MAX) – 1V

IG1V2(SINK) V1V2 = 1.5 V, VG1V2 = 6 V

VG1V2(MAX) V1V2 = 0.9 V

VG1V2(MIN) V1V2 = 1.5 V

ROUT(G1V2)

CISS1V2

1.174

1.205

1.236

V

–

−100

–

nA

−120

−240

–360

μA

0.5

3

–

mA

9

–

15

V

–

0.7

1.0

V

–

175

–

Ω

250

–

3900

pF

VCP Output Voltage

VCP Switching Frequency

ΔVCP

fSW(CP)

VCP − VIN

4.1

6.6

–

V

–

100

–

kHz

Continued on the next page…

Allegro MicroSystems, Inc.

6

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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