ADP2121 datasheet(3/20 Pages) AD

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ADP2121

Rev. B | Page 3 of 20

SPECIFICATIONS

VIN = EN = 3.6 V; VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V, and 2.3 V; typical values are at TA = 25°C; and minimum/maximum limits

guaranteed for TJ = −40°C to +125°C,1

Table 2.

unless otherwise noted.

Parameters

Conditions

Min

Typ

Max

Unit

SUPPLY

Input Voltage Range

VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V

2.3

5.5

VOUT = 2.3 V

2.9

5.5

Quiescent Current

Auto mode, no load, not switching, TA = −40°C to 85°C

µA

PWM mode, no load

Shutdown Current

VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V, VEN = 0 V, TA = −40°C to 85°C

0.3

µA

VOUT = 2.3 V, VEN = 0 V, TA = −40°C to 85°C

0.4

1.5

µA

UNDERVOLTAGE LOCKOUT

Undervoltage Lockout Threshold

VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V, VIN rising

2.1

2.3

VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V, VIN falling

1.6

2.0

VOUT = 2.3 V, VIN rising

2.4

2.6

VOUT = 2.3 V, VIN falling

1.9

2.3

OUTPUT

Maximum Continuous Output Current2

VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V, VIN = 2.3 V

300

VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V, VIN = 2.5 V

500

VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V, VIN = 2.7 V to 5.5 V

600

VOUT = 2.3 V, VIN = 2.9 V to 5.5 V

600

Output Voltage Accuracy3

Auto mode, VIN = 3.6 V, TA = 25°C, no load, with respect to VOUT

−3

PWM mode, VIN = 2.5 V to 4.5 V, no load, with respect to VOUT

−3

Load Regulation4

PWM mode, ILOAD = 1 mA to 600 mA

−0.2

%/A

Feedback Bias Current

VOUT = 1.8 V, VFB = 1.8 V and VOUT = 1.82 V, VFB = 1.82 V

3.8

µA

VOUT = 1.85, VFB = 1.85 V and VOUT = 1.875 V, VFB = 1.875 V

4.1

µA

VOUT = 2.3 V, VFB = 2.3 V

6.4

µA

SWITCHING CHARACTERISTICS

SW On Resistance (RDSon)

P-channel switch

220

440

mΩ

N-channel synchronous rectifier

260

550

mΩ

SW Leakage Current

VIN = 5.5 V, VSW = 0 V and 5.5 V

µA

SW Current Limit

P-channel switch, open loop, TA = −40°C to 125°C

790

1000

1222

P-channel switch, open loop, TA = −40°C to 85°C

828

1000

1222

Oscillator Frequency

5.36

6.64

MHz

EN/MODE INPUT LOGIC

VIN = 2.3 V to 5.5 V

High Threshold Voltage

1.3

Low Threshold Voltage

0.4

Leakage Current

VIN = VEN = VMODE = 5.5 V

0.01

µA

SOFT START

Time from EN ≥ 1.2 V to stable VOUT

Soft Start Period5

VOUT = 1.82 V, RLOAD = 5.1 Ω

275

310

µs

VOUT = 1.8 V, 1.85 V, 1.875 V, RLOAD = 5.1 Ω

µs

VOUT = 2.3 V, RLOAD = 5.1 Ω

100

115

µs

SHORT-CIRCUIT THRESHOLD

1.24

THERMAL SHUTDOWN

Thermal Shutdown Threshold

150

°C

Thermal Shutdown Hysteresis

°C

1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC); typical values are at T

A = 25°C.

2 Guaranteed by design. The maximum output current guarantee for 2.3 V to 2.5 V increases linearly from 300 mA to 500 mA. The maximum output current guarantee for 2.5 V to

2.7 V increases linearly from 500 mA to 600 mA. For greater than 2.7 V, the maximum output current guarantee is 600 mA.

3 Transients not included in voltage accuracy specifications. For PFM mode, the VOUT accuracy specification is for the upper point of the ripple.

4 The load regulation typical value includes all voltage options. The typical value is different for each voltage option, but can be up to −0.2%/A.

5 Typical value characterized on bench. Maximum specification guaranteed by design.

CIN = 2.2 µF (GRM155R60J225M), L = 0.47 µH (LQM2HPNR47MG0L), COUT = 4.7 µF

(

GRM155R60J475ME87D).

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