DC6M50xX6 family
6 MHz, 500 mA, ultra small DC-to-DC buck converter
Rev. 1 — 13 February 2013
Product data sheet
1. Product profile
1.1 General description
The DC6M50xX6 family consists of highly efficient 6 MHz, 500 mA step-down DC-to-DC
converters. The devices convert input voltages between 2.3 V and 5.5 V to fixed output
voltages of 1.2 V, 1.5 V or 1.8 V.
The devices of DC6M50xX6 family are optimized for battery-driven applications. Their
high efficiency of up to 95 % enables an extended battery life in all portable designs. Buck
operation at a switching frequency of 6 MHz allows using only a small low-cost 470 nH
coil and two capacitors. Besides working with standard chip inductors, the DC6M50xX6
family devices also support Printed-Circuit Board (PCB) coils and air coils.
Product versions with and without automatic mode selection between Pulse Frequency
Modulation (PFM) and Pulse Width Modulation (PWM) are available. Optionally the
devices can be switched to forced PWM mode.
1.2 Features and benefits
Efficiency up to 95 %
Extremely low output ripple in PWM and PFM mode
2
% total DC output voltage accuracy
Soft start function for limiting inrush current
Short circuit and over-temperature protection
Enable input operates with an active HIGH or with a clock signal
Optional power good indicator output (XSHUTDOWN version)
Wafer-Level Chip-Size Package (WLCSP) with 0.4 mm pitch
1.3 Applications
Smartphones
Mobile handsets
Digital Still Cameras (DSC)
Tablet PCs
Mobile Internet Devices (MID)
Portable Media Players (PMP)
1.4 Quick reference data
I
O
= 500 mA (max)
V
O
= 1.2 V, 1.5 V or 1.8 V
Supply current I
CC
= 0.2
A
in standby
mode
Switching frequency f
clk(PWM)
= 6 MHz
V
I
= 2.3 V to 5.5 V
NXP Semiconductors
DC6M50xX6 family
6 MHz, 500 mA, ultra small DC-to-DC buck converter
2. Pinning information
bump A1
index area
MODE
SW
FB
A1
B1
C1
A2
B2
C2
IN
EN
GND
018aaa210
Transparent top view
solder balls facing down
Fig 1.
Table 1.
Symbol
IN
SW
EN
FB
GND
[1]
Pin configuration WLCSP6
Pin description
Pin
A2
B1
B2
C1
C2
Description
voltage select/mode select/XSHUTDOWN
supply input voltage
output voltage switch regulator
enable
control feedback
ground
MODE
[1]
A1
Mode function depends on the chosen version of the buck converter as listed in
Table 3.
DC6M50XX6_FAM
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 1 — 13 February 2013
2 of 25
NXP Semiconductors
DC6M50xX6 family
6 MHz, 500 mA, ultra small DC-to-DC buck converter
3. Ordering information
DC6M50xX6 family is available with different modes or output voltages and can be
supplied upon request and acceptance from NXP Semiconductors. For more details, see
Section 19.
Table 2.
Ordering information
Package
Name
DC6M50xX6 family
[1]
Type number
Description
wafer-level chip-size package; 6 bumps (3
2)
[1]
Version
-
WLCSP6
Size 1.36
0.96
0.47 mm
3.1 Ordering options
Table 3.
Ordering options for DC6M501X6 and DC6M503X6
[1]
Mode option
select automatic PWM/PFM or forced PWM mode
select automatic PWM/PFM or forced PWM mode
select automatic PWM/PFM or forced PWM mode
power good (XSHUTDOWN) output; automatic PWM/PFM mode
power good (XSHUTDOWN) output; automatic PWM/PFM mode
power good (XSHUTDOWN) output; automatic PWM/PFM mode
Nominal output
voltage (V
O(nom)
)
1.2 V
1.5 V
1.8 V
1.2 V
1.5 V
1.8 V
Type number
DC6M501X6/12S
DC6M501X6/15S
DC6M501X6/18S
DC6M503X6/12A
DC6M503X6/15A
DC6M503X6/18A
[1]
For detail information about options see
Section 5,
about functional selection see
Section 5.6.
Table 4.
Ordering options for DC6M502X6
[1]
Mode option
output voltage select; automatic PWM/PFM mode
output voltage select; automatic PWM/PFM mode
output voltage select; automatic PWM/PFM mode
output voltage select; forced PWM mode
output voltage select; forced PWM mode
output voltage select; forced PWM mode
Nominal output voltage (V
O(nom)
)
MODE = LOW
MODE = HIGH
1.5 V
1.8 V
1.8 V
1.5 V
1.8 V
1.8 V
1.2 V
1.2 V
1.5 V
1.2 V
1.2 V
1.5 V
Type number
DC6M502X6/1215A
DC6M502X6/1218A
DC6M502X6/1518A
DC6M502X6/1215F
DC6M502X6/1218F
DC6M502X6/1518F
[1]
For detail information about options see
Section 5,
about functional selection see
Section 5.6.
DC6M50XX6_FAM
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 1 — 13 February 2013
3 of 25
NXP Semiconductors
DC6M50xX6 family
6 MHz, 500 mA, ultra small DC-to-DC buck converter
3.1.1 Naming convention
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Fig 2.
Naming convention
4. Block diagram
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Fig 3.
Block diagram
DC6M50XX6_FAM
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 1 — 13 February 2013
4 of 25
NXP Semiconductors
DC6M50xX6 family
6 MHz, 500 mA, ultra small DC-to-DC buck converter
5. Functional description
The step-down converter (Figure
4)
generates a regulated constant output voltage behind
an externally connected coil at pin SW. For this operation only the inductor and two filter
capacitors are required. No additional flyback diode is needed. Place the pick-off pin for
FB behind the inductor to sense the output voltage.
9
,
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,1
02'(
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(1
6:
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9
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Fig 4.
Simple application schematic
The step-down converter starts a switching cycle with an active P-channel MOS (PMOS)
which allows rising the output voltage until a defined value is reached. Then the feedback
circuit turns off the PMOS switch and turns on the N-channel MOS (NMOS) as active
rectification.
The step-down converter (Figure
3)
consists of an integrated oscillator. It runs at high
frequency to compare the return path and to control the PWM/PFM logic block and the
break-before-make circuit of the integrated NMOS and PMOS transistor. This allows
reaching constant output voltage with high efficiency and low output ripple.
5.1 Automatic PWM/PFM mode
Battery-driven applications need power-saving options. Therefore the DC-to-DC converter
provides a current-sensing circuit which detects the output current. If the current is below
a certain threshold, the system switches to PFM mode. In this operation, the converter
uses less current and saves battery operation time. This automode can be switched off to
the forced PFM mode (see
Section 5.6).
5.2 Inrush current limiter (soft start)
The DC6M50xX6 family has an integrated soft start function to limit the maximum inrush
current and to reduce an input voltage dip. Therefore the system has a turn-on procedure
which starts up step-by-step over 300
s
and limits the inrush current via a duty cycle
control up to the maximum current capability.
5.3 Thermal protection
The DC6M50xX6 family products have an integrated thermal protection. The protection
circuit senses the internal temperature of the chip and switches off the integrated PMOS
power switch transistor when a defined maximum temperature is reached. After the
temperature returns to a safe value, the system restarts with a soft start.
DC6M50XX6_FAM
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 1 — 13 February 2013
5 of 25
Analog electronics
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