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PDF LD6938 Data sheet ( Hoja de datos )

Número de pieza LD6938
Descripción Dual low-dropout regulators
Fabricantes NXP Semiconductors 
Logotipo NXP Semiconductors Logotipo



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No Preview Available ! LD6938 Hoja de datos, Descripción, Manual

LD6938 series
Dual low-dropout regulators, low noise, 300 mA
Rev. 1 — 11 July 2013
Objective data sheet
1. Product profile
1.1 General description
The LD6938 series consists of small-size dual Low DropOut regulators (LDO). Each
device delivers two times 300 mA with a typical voltage drop of 240 mV at full output load.
The devices offer two separate fixed nominal output voltages (VO(nom)) in the range of
1.2 V to 3.3 V.
The LDO has an integrated Soft start to control the inrush current during start-up. The
output mode, when disabled, can be high-ohmic 3-state or auto discharge. Optionally a
delayed start-up circuit is available for the second output. The devices are available in a
6-bump Wafer-Level Chip-Scale Package (WLCSP) with a height of 0.47 mm.
1.2 Features and benefits
High Power Supply Rejection Ratio (PSRR)
Low output noise
Low quiescent current
Extremely low standby current (0.1 A)
Soft start circuit to limit inrush current
Output current limiter with foldback circuit
Overtemperature protection
Delayed output circuit for second LDO (optional)
Auto discharge or high-ohmic mode for output when disabled
WLCSP6 with 0.4 mm pitch and package size of 1.2 mm 0.8 mm 0.47 mm
1.3 Applications
Smartphones
Mobile handsets
Digital still cameras
Tablet PCs
Mobile internet devices
Portable media players
1.4 Quick reference data
IO = 300 mA for each LDO
PSRR = 80 dB at 1 kHz
RMS noise Vn(o)RMS = 70 V
at 10 Hz to 100 kHz
tstartup(reg) 200 s
VI = 1.7 V to 5.5 V
VO = 1.2 V to 3.3 V (fixed value)
Drop voltage Vdo = 240 mV
at IO = 300 mA
Quiescent current Iq = 30 A for each
LDO at IO = 0 mA

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LD6938 pdf
NXP Semiconductors
LD6938 series
Dual low-dropout regulators, low noise, 300 mA
5. Limiting values
Table 5. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).
Symbol Parameter
Conditions
Min Max Unit
Tstg
Tj
Tamb
Ptot
VESD
storage temperature
junction temperature
ambient temperature
total power dissipation
electrostatic discharge
voltage
human body model level 4
machine model class 3
55
40
40
[1] -
[2] -
[3] -
+150
+125
+85
1000
2
200
C
C
C
mW
kV
V
Pin IN, EN1 and EN2
VI input voltage
VEN voltage on pin EN
Pin OUT1 and OUT2
4 ms transient
4 ms transient
0.5 +6.0 V
0.5 +6.0 V
VO output voltage
IO output current
4 ms transient
0.5 +6.0 V
0 500 mA
[1] The (absolute) maximum power dissipation depends on the junction temperature Tj. Higher power
dissipation is allowed with lower ambient temperatures. The conditions to determine the specified values
are Tamb = 25 C and the use of a two-layer Printed-Circuit Board (PCB).
[2] According to IEC 61340-3-1.
[3] According to JESD22-A115C.
6. Recommended operating conditions
Table 6. Operating conditions
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
Tamb
Tj
Pin IN
ambient temperature
junction temperature
VI input voltage
Cext(IN) external capacitance on pin IN
Pin EN1 and EN2
VEN voltage on pin EN
Pin OUT1 and OUT2
VO
CL(ext)
output voltage
external load capacitance
[1] See Section 9.1 “Input and output capacitor values”.
Min Max Unit
40 +85 C
- +125 C
1.7 5.5 V
[1] 1.0
-
F
0 VI V
0 5.5 V
[1] 1.0
-
F
LD6938_SER
Objective data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 11 July 2013
© NXP B.V. 2013. All rights reserved.
5 of 15

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LD6938 arduino
NXP Semiconductors
c
f
LD6938 series
Dual low-dropout regulators, low noise, 300 mA
D
e
e
E
e
solder resist
solder paste = solderland
occupied area
Dimensions in mm
Fig 7. Soldering footprint WLCSP6
Table 13.
Symbol
c
D
E
e
f
Dimensions of soldering footprint WLCSP6 (Figure 7)
Min Typ Max
- 0.25 -
0.71 0.76 0.81
1.11 1.16 1.21
- 0.4 -
-
0.325
-
wlcsp6_2x3_fr
Unit
mm
mm
mm
mm
mm
LD6938_SER
Objective data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 11 July 2013
© NXP B.V. 2013. All rights reserved.
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