MAX1687EUE datasheet(4/12 Pages) MAXIM

Part #	MAX1687EUE

Description	Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM

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Manufacturer	MAXIM [Maxim Integrated Products]

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Step-Up DC-DC Converters with Precise,

Adaptive Current Limit for GSM

4

_______________________________________________________________________________________

_____________________________Typical Operating Characteristics (continued)

(VIN = +3.3V, VOUT = 5V, VLIM = 1V, Figures 6b and 7, TA = +25°C, unless otherwise noted.)

300

450

400

350

500

550

600

650

700

750

800

100

200

150

250

300

350

400

MAX1688

IPEAK vs. VOUT DROOP

VOUT DROOP (mV)

RCHG = 40.2k

0

800

700

600

500

400

300

200

100

15

20

25

30

35

40

MAX1688 PEAK INDUCTOR CURRENT

vs. RCHG (1A GSM LOAD)

RCHG (kΩ)

0

100

200

300

400

500

600

700

800

15

20

25

30

35

40

MAX1688 PEAK BATTERY CURRENT

vs. RCHG (1A GSM LOAD)

RCHG (kΩ)

1.5

2.5

2.0

3.5

3.0

4.0

4.5

-40

20

40

-20

0

60

80

100

TEMPERATURE (°C)

NO-LOAD BATTERY INPUT CURRENT vs.

TEMPERATURE (VOUT = 5V, VLIM = 1V )

VIN = 5V

VIN = 3.3V

VIN = 2.7V

VIN = 6V

REFERENCE VOLTAGE vs. REFERENCE

CURRENT (VIN = 3.3V, VOUT = 5V)

IREF (µA)

1.245

1.200

1

1000

100

10

1.215

1.205

1.235

1.225

1.250

1.220

1.210

1.240

1.230

1.245

1.247

1.249

1.251

1.253

TEMPERATURE (°C)

-40

20

40

-20

0

60

80

100

REFERENCE VOLTAGE vs. TEMPERATURE

(VIN = 3.3V, VOUT = 5V)

1200

0

1

10

100

SWITCHING FREQUENCY vs. INDUCTANCE

(VIN = 3.3V, VOUT = 5V,

ILOAD = 100mA, VLIM = 1V)

200

INDUCTANCE (

µH)

600

400

1000

800

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