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STOD1317B
User Manual
22 pgs1.07 Mb0
Table of contents
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ST STOD1317B User Manual

Features
■ Operating input voltage range from 2.6 V to
4.8 V
■ Low output ripple
■ True-shutdown
■ Short-circuit protection
■ Digital low power function
■ Very high efficiency at light load thanks to pulse
skipping operation
■ Very fast line and load transients
■ 1.2 MHz switching frequency
■ 1 µA max. quiescent current
■ DFN12L (3 x 3 x 0.8 mm)
Applications
■ Single rail AMOLED display
■ Cellular phones
■ Battery powered equipment
STOD1317B
170 mA 13 V, high efficiency
boost converter + LDO
DFN12L (3 x 3 mm)
integrated and contribute to achieving high efficiency. The true-shutdown feature allows physical disconnection of the battery from the load when the device is in shutdown mode. The control technique is able to maintain efficiency higher than 85% at light loads and higher than 80% at full load. The device includes soft-start control, inrush current limiter, thermal shutdown and inductor peak current limit. The STOD1317B is packaged in DFN12L 3 x 3 x 0.8 mm height.
Description
The STOD1317B is a fixed frequency, high efficiency, boost DC-DC converter with cascaded LDO able to provide output voltages ranging from 6 V to 13 V starting with an input voltage from
2.6 V to 4.8 V. The device is designed to supply loads that are very sensitive to output ripple such as AMOLED display panels. A dedicated LDO is able to suppress any ripple and noise coming out from the DC-DC converter. The LDO works with a constant drop in order to maintain high efficiency in the whole operating range. The low R channel and P-channel MOSFET switches are

Table 1. Device summary

Order code Marking Package Packaging
STOD1317BPUR 1317B DFN12L (3 x 3mm) 3000 parts per reel
December 2011 Doc ID 022607 Rev 1 1/22
DSon
N-
www.st.com
22
Contents STOD1317B
Contents
1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1 BOOST multiple mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1.1 Pulse skipping operation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1.2 Discontinuous conduction mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1.3 Continuous conduction mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2 Enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.3 Soft-start and inrush current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.4 Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.5 Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.6 Digital low power function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1 External passive components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1.1 Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1.2 Input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2 Recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22 Doc ID 022607 Rev 1
STOD1317B Schematic

1 Schematic

Figure 1. Application schematic

Table 2. Typical external components

Comp. Manufacturer Part number Value Ratings Size
MURATA
C
IN
C
MID
C
OUT
(1)
L
R1 kΩ 0402
R2 kΩ 0402
1. Inductor used for the typical application conditions. Inductance values ranging from 3.3 µH to 6.8 µH can be used together with the STOD1317B. A minimum saturation current of 1.2 A must be ensured to support 170 mA at 2.6 V in full range.
Taiyo Yuden
TDK
MURATA
TDK
MURATA
TDK
CoilCraft
TDK
DASTEK
GRM219R61A106KE44
LMK212BJ106KD-T
C1608X5R0J106
GRM219R61C475KE15
C2012X5R1C475
GRM219R61C475KE15
C2012X5R1C475
LPS4012-472ML
VLS252012T-4R7MR81
PNL3008-4R7M
10µF
4.7µF
4.7µF
4.7µH
±10%, X5R, 10V ±10%, X5R, 10V
±10%, X5R, 6.3V
±10%, X5R, 16V ±10%, X5R, 16V
±10%, X5R, 16V ±10%, X5R, 16V
±20%, curr. 1.7A, resist. 0.175Ω ±20%, curr. 1.3A, resist. 0.338Ω ±20%, curr. 0.9A, resist. 0.280Ω
0805 0805 0603
0805 0805
0805 0805
4.0 x 4.0 x 1.2
2.5 x 2.0 x 1.2
3.1 x 3.1 x 0.8
Note: All the above components refer to a typical application. Operation of the device is not limited
to the choice of these external components.
Doc ID 022607 Rev 1 3/22
Schematic STOD1317B

Figure 2. Block schematic

VMIDLX
PGND
GND
VIN
RING
KILLER
PGND
OVP
M1
DMD
M0
s
PWM LOGIC CONTROL
&
DRIVER
OCP
COMP
+-
ss
M2
s
M3
OTA
+-
SOFT
START
+-
EA
SCP
VOUT
VO_SET
FB
VREF
+
OSC
SHUT
DOWN
ENNC
OTP
4/22 Doc ID 022607 Rev 1
STOD1317B Pin configuration

2 Pin configuration

Figure 3. Pin configuration (top view)

VMID
VOUT
VO_SET
AGND
GND
FB
EN

Table 3. Pin description

Pin name Pin number Description
VMID 1 Step-up output voltage
VOUT 2 LDO output voltage
VO_SET 3 LDO output voltage set
GND 4 Analog ground
FB 5 Feedback voltage
Enable pin. Connect this pin to GND or a voltage lower than 0.4V
EN 6
NC 7 Not connected
to shut down the IC. A voltage higher than 1.2V is required to enable the IC
LX
LX
PGND
PGND
VIN
NC
VIN 8 Supply voltage
PGND 9, 10 Power ground
LX 11, 12 Switch pin. Inductor connection to the internal switches
Exposed
PA D
Internally connected to PGND
Doc ID 022607 Rev 1 5/22
Maximum ratings STOD1317B

3 Maximum ratings

Table 4. Absolute maximum ratings

Symbol Parameter Value Unit
V
IN
Supply voltage -0.3 to +7.0 V
LX Switching node -0.3 to +16 V
V
OUT_SET
V
OUT
LDO output voltage set 16 V
Output voltage -0.3 to +16 V
EN Logic pin -0.3 to 4.6 V
FB Feedback pin -0.3 to +2.5 V
Machine model ±200 V
ESD
Human body model ±2000 V
T
T
AMB
T
J
STG
Operating ambient temperature -40 to 85 °C
Maximum operating junction temperature +150 °C
Storage temperature -65 to 150 °C
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.

Table 5. Thermal data

Symbol Parameter Value Unit
R
R
thJA
thJC
Thermal resistance junction-ambient 49.1 °C/W
Thermal resistance junction-case (FR-4 PCB) 4.216 °C/W
6/22 Doc ID 022607 Rev 1
STOD1317B Electrical characteristics

4 Electrical characteristics

TJ = 25 °C, VIN = 3.7 V, V L = 4.7 µH, V

Table 6. Electrical characteristics

= 2 V, unless otherwise specified.
EN
= 10 V, CIN = 2 x 10 µF, C
OUT
= 2 x 4.7 µF, C
MID
= 2 x 4.7 µF,
OUT
Symbol Parameter Test conditions Min. Typ. Max. Unit
General section
V
IN
Operating power input voltage range
Shutdown mode
Iq
No switching V
V
UVLO
f
SW
I
PK
Undervoltage lockout threshold
Switching frequency 1 1.2 1.35 MHz
Switch current limitation 1.6 2 2.4 A
Output voltage (V
Feedback voltage TA=25°C 1.08 1.2 1.32 V
Accuracy -40°C<TA<85°C 1.02 1.38 V
FB
Output voltage range 6 10 13 V
Total line/load static variation
Output voltage ripple
Overvoltage protection VFB=0 14 15 16 V
FB pin leakage current VFB=5V to 13V 1 µA
Step-up output voltage regulation
ΔV
V
ΔV
V
RIPPLE
V
I
VMID
V
FB
OUT
LINE/LOA
D
OUT
OVP
LKFB
OUT
Shutdown mode, V
=GND
EN
=3.7V, VFB=1.3V 1 1.5 mA
EN=VIN
rising 2.4 2.5
V
IN
falling 2.1 2.2
V
IN
)
(1)
TA=25°C; VIN=2.6V to
4.8V; I
V
IN
I
OUT
=5mA to 170mA
OUT
=3.7V, V
=10mA
OUT
=10V,
2.6 3.7 4.8 V
0.5 1 µA
30 40 mV
30 mV
OUT +
V
0.38
VOUT +
0.56
VOUT +
0.7
V
V
Logic inputs
EN low-level input voltage 0.4 V
IL
EN high-level input voltage 1.2 V
EN input leakage current VEN=VIN=4.8V 1 µA
V
I
V
IH
LK-I
Power switches
P-Channel ON resistance I
R
DSON
I
LKG-LX
N-Channel ON resistance I
LX leakage current VIN=VLX=4.8V; VEN=0 1 µA
=100mA 550 900
SW_P
=100mA 250 400
SW_N
Doc ID 022607 Rev 1 7/22
mΩ
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