3 MHz, 600 mA, Low Quiescent Current
Buck with 300 mA LDO Regulator
Data Sheet
ADP2140
Rev. A
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FEATURES
Input voltage range: 2.3 V to 5.5 V
LDO input (VIN2) 1.65 V to 5.5 V
Buck output voltage range: 1.0 V to 3.3 V
LDO output voltage range: 0.8 V to 3.3 V
Buck output current: 600 mA
LDO output current: 300 mA
LDO quiescent current: 22 糀 with zero load
Buck quiescent current: 20 糀 in PSM mode
Low shutdown current: <0.3 糀
Low LDO dropout 110 mV @ 300 mA load
High LDO PSRR
65 dB @ 10 kHz at VOUT2 = 1.2 V
55 dB @ 100 kHz at VOUT2 = 1.2 V
Low noise LDO: 40 糣 rms at VOUT2 = 1.2 V
Initial accuracy: ?%
Current-limit and thermal overload protection
Power-good indicator
Optional enable sequencing
10-lead 0.75 mm ?3 mm ?3 mm LFCSP package
APPLICATIONS
Mobile phones
Personal media players
Digital camera and audio devices
Portable and battery-powered equipment
GENERAL DESCRIPTION
The ADP2140 includes a high efficiency, low quiescent 600 mA
stepdown dc-to-dc converter and a 300 mA LDO packaged in a
small 10-lead 3 mm ?3 mm LFCSP. The total solution requires
only four tiny external components.
The buck regulator uses a proprietary high speed current-mode,
constant frequency, pulse-width modulation (PWM) control
scheme for excellent stability and transient response. To ensure
the longest battery life in portable applications, the ADP2140 has
a power saving variable frequency mode to reduce switching fre-
quency under light loads.
The LDO is a low quiescent current, low dropout linear regulator
designed to operate in a split supply mode with V
IN2 as low as
1.65 V. The low input voltage minimum allows the LDO to be
powered from the output of the buck regulator increasing effi-
ciency and reducing power dissipation. The ADP2140 runs from
input voltages of 2.3 V to 5.5 V allowing single Li+/Li polymer
TYPICAL APPLICATION CIRCUITS
VIN1
PGND
PG
SW
EN1
AGND
EN2
PG
EN1
EN2
FB
VOUT2
10
9
8
7
6
VIN2
1
2
3
4
5
ADP2140
100k&
+
C
IN
10礔
+
C
OUT2
1礔
+
C
OUT
10礔
IN1
= 3.6
V
OUT2
= 1.8V
1礖
V
OUT
= 1.2V
Figure 1. ADP2140 with LDO Connected to VIN1
VIN1
PGND
PG
SW
EN1
AGND
EN2
PG
EN1
EN2
FB
VOUT2
10
9
8
7
6
VIN2
1
2
3
4
5
ADP2140
100k&
+
C
IN
10礔
+
C
OUT2
1礔
+
C
OUT
10礔
IN1
= 3.3
V
OUT2
= 1.2V
1礖
V
OUT
= 1.8V
Figure 2. ADP2140 with LDO Connected to Buck Output
cell, multiple alkaline/NiMH cell, PCMCIA, and other standard
power sources.
ADP2140 includes a power-good pin, soft start, and internal
compensation. Numerous power sequencing options are user-
selectable through two enable inputs. In autosequencing mode,
the highest voltage output enables on the rising edge of EN1.
During logic controlled shutdown, the input disconnects from
the output and draws less than 300 nA from the input source.
Other key features include: undervoltage lockout to prevent deep
battery discharge, soft start to prevent input current overshoot
at startup, and both short-circuit protection and thermal overload
protection circuits to prevent damage in adverse conditions.
When the ADP2140 is used with two 0603 capacitors, one 0402
capacitor, one 0402 resistor, and one 0805 chip inductor, the total
solution size is approximately 90 mm
2
resulting in the smallest foot-
print solution to meet a variety of portable applications.
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