LTM4605 Просмотр технического описания (PDF) - Linear Technology

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LTM4605

High Efficiency Buck-Boost DC/DC uModule

Linear Technology 

LTM4605

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the –40°C to 85°C

temperature range, otherwise specifications are at TA = 25°C, VIN = 12V. Per typical application (front page) configuration.

SYMBOL

PARAMETER

CONDITIONS

MIN TYP

MAX UNITS

Control Section

VFB

VRUN

ISS

VSTBYMD(START)

VSTBYMD(KA)

VFCB

IFCB

VBURST

Feedback Reference Voltage

RUN Pin ON/OFF Threshold

Soft-Start Charging Current

Start-Up Threshold

Keep-Active Power On Threshold

Forced Continuous Threshold

Forced Continuous Pin Current

Burst Inhibit (Constant Frequency)

Threshold

VCOMP = 1.2V

VRUN = 2.2V

VSTBYMD Rising

VSTBYMD Rising, VRUN = 0V

VFCB = 0.85V

Measured at FCB Pin

l 0.792 0.8

0.808

V

1

1.6

2.2

V

1

1.7

μA

0.4

0.7

V

1.25

V

0.76 0.8

0.84

V

–0.3 –0.2

–0.1

μA

5.3

5.5

V

DF(BOOST, MAX)

DF(BUCK, MAX)

tON(MIN, BUCK)

Maximum Duty Factor

% Switch M4 On

Maximum Duty Factor

% Switch M1 On

Minimum On-Time for Synchronous Switch M1 (Note 5)

Switch in Buck Operation

99

%

99

%

200

250

ns

RFBHI

Resistor Between VOUT and VFB pins

Internal VCC Regulator

INTVCC

Internal VCC Voltage

ΔVLDO/VLDO

Internal VCC Load Regulation

VEXTVCC

EXTVCC Switchover Voltage

ΔVEXTVCC(HYS)

EXTVCC Switchover Hysteresis

ΔVEXTVCC

EXTVCC Switch Drop Voltage

Current Sensing Section

VIN > 7V, VEXTVCC = 5V

ICC = 0mA to 20mA, VEXTVCC = 5V

ICC = 20mA, VEXTVCC Rising

ICC = 20mA, VEXTVCC = 6V

99.5 100

100.5

kΩ

l 5.7

6

6.3

V

0.3

2

%

l 5.4

5.6

V

300

mV

60

150

mV

VSENSE(MAX)

Maximum Current Sense Threshold Boost Mode

Buck Mode

l

160

190

mV

l –95 –130

–150

mV

VSENSE(MIN, BUCK)

ISENSE

PGOOD

Minimum Current Sense Threshold Discontinuous Mode

Sense Pins Total Source Current

VSENSE– = VSENSE+ = 0V

–6

mV

–380

μA

ΔVFBH

ΔVFBL

ΔVFB(HYS)

VPGL

IPGOOD

PGOOD Upper Threshold

PGOOD Lower Threshold

PGOOD Hysteresis

PGOOD Low Voltage

PGOOD Leakage Current

VFB Rising

VFB Falling

VFB Returning

IPGOOD = 2mA

VPGOOD = 5V

5.5

7.5

10

%

–5.5 –7.5

–10

%

2.5

%

0.2

0.3

V

1

μA

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTM4605E is guaranteed to meet performance specifications

from 0°C to 85°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. The LTM4605I is guaranteed over the

–40°C to 85°C temperature range.

Note 3: The LTM4605 is tested in a feedback loop that servos VCOMP to a

specified voltage and measures the resultant VFB.

Note 4: Turn-on and turn-off time are measured using 10% and 90%

levels. Transition delay time is measured using 50% levels.

Note 5: 100% tested at wafer level only.

4605fa

4

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