AS3709
Micro-PMIC with 5 DC/DCs and 2 LDOs
General Description
The AS3709 is an ultra compact Micro-PMIC containing 5
high-efficiency, constant-frequency synchronous buck
converters in addition with two universal IO LDOs are available
for lower current power rails. The wide input voltage range (2.7V
to 5.5V), automatic power-save mode and minimal external
component requirements make the AS3709 perfect for any
single Li-Ion battery-powered or fixed 3.3V/5V supply
application. Typical supply current with no load is 110μA and
decreases to
≤
7μA in shutdown mode. An internal synchronous
switch increases efficiency and eliminates the need for an
external Schottky diode. The internally fixed switching
frequency (2MHz, 3MHz or 4MHz) allows the use of small surface
mount external components. Very low output voltages can be
delivered with the internal 0.6V feedback reference voltage. The
AS3709 is available in a 32-pin QFN 4x4mm package and in a
very compact WL-CSP36 with 0.4mm pitch.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS3709, Micro-PMIC with 5 DC/DCs
and 2 LDOs are listed below:
Figure 1:
Added Value of Using AS3709
Benefits
•
Compact design due to small coils for IO and
memory voltage generation
•
Independent voltage rails for general purpose
IO supplies
•
Flexible and fast adaptation to different
processors/applications
•
Power saving control according to the
processor‘s needs.
•
Self-contained start-up and control for
single-cell battery applications.
Safety shutdown feature.
•
Dedicated packages for specific applications.
Optimization for PCB cost or size.
Features
•
5 DC/DC step down regulators (2-4MHz)
•
2 universal IO LDOs
•
OTP programmable boot sequence
•
Stand-by function with selectable rails and
programmable voltages
•
•
•
•
Control Interface
I²C control lines
ON key with 4s/8s emergency shut-down
POR with RESET I/O
•
32-pin QFN (4mmx4mm), 0.4mm pitch
•
36-ball WL-CSP 0.4mm pitch
ams Datasheet
[v1-06] 2017-Mar-01
Page 1
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AS3709 −
Pin Assignments
Figure 5:
Pin Description
Pin Number
Pin Name
QFN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Pin Type
DIG OUT
SUP IN
SUP IN
DIG OUT
GND
ANA IN
SUP IN
DIG OUT
GND
ANA IN
SUP IN
ANA OUT
ANA OUT
SUP IN
ANA IN
GND
DIG OUT
SUP IN
ANA IN
GND
DIG OUT
SUP IN
ANA OUT
DIG IN
DIG IO
DIG IN
DIG IO
Description
DC/DC SD5 switch output to coil
DC/DC SD5 pos supply terminal
DC/DC SD4 pos supply terminal
DC/DC SD4 switch output to coil
DC/DC SD4 neg supply terminal
DC/DC SD4 Feedback pin
DC/DC SD3 pos supply terminal
DC/DC SD3 switch output to coil
DC/DC SD3 neg supply terminal
DC/DC SD3 Feedback pin
Supply pin for LDO2
Output Voltage of LDO2
Output Voltage of LDO1
Supply pin for LDO1
DC/DC SD2 Feedback pin
DC/DC SD2 neg supply terminal
DC/DC SD2 switch output to coil
DC/DC SD2 pos supply terminal
DC/DC SD1 Feedback pin
DC/DC SD1 neg supply terminal
DC/DC SD1 switch output to coil
DC/DC SD1 pos supply terminal
Internal 2.5V regulator output
2-wire Serial IF Clock Input
2-wire Serial IF Data IO
Power Up Input
Reset IO, external pull-up resistor
needed
If Not Used
Open
Always needed
Always needed
Open
Always needed
Open
Always needed
Open
Always needed
Open
Always needed
Open
Open
Always needed
Open
Always needed
Open
Always needed
Open
Always needed
Open
Always needed
Always needed
Pull-up to V2_5
Pull-up to V2_5
Open
Always needed
WL-CSP
B5
B6
B6
C6
D5
C5
E6
E5
F5
E4
F4
D4
D3
F3
E3
F2
E2
E1
C3
D2
C2
C1
B1
A1
B2
B3
A2
LX_SD5
VSUP_SD5
VSUP_SD4
LX_SD4
PVSS_SD4
FB_SD4
VSUP_SD3
LX_SD3
PVSS_SD3
FB_SD3
VIN_LDO2
LDO2
LDO1
VIN_LDO1
FB_SD2
PVSS_SD2
LX_SD2
VSUP_SD2
FB_SD1
PVSS_SD1
LX_SD1
VSUP_SD1
V2_5
SCL
SDA
ON
XRES
Page 4
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ams Datasheet
[v1-06] 2017-Mar-01
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