ST ST8R00 User Manual
Micropower 1 A synchronous step-up DC-DC converter
Features
■ Output voltage adjustable from 6 V to 12 V
■ Output voltage accuracy: ± 2%
■ Output current up to 1 A
■ Low ripple voltage: 5 mV (typ.)
■ Synchronous rectification
■ High 90% efficiency: V
■ Few external components
■ Thermal shutdown protection
■ Very small DFN8 (4 x 4 mm) package
Description
The ST8R00 is a synchronous PWM step-up DCDC converter. The device is able to provide an
output voltage in the range of 6 to 12 V with an
input voltage from 4 to 6 V. The high switching
frequency (1.7 MHz) permits the use of tiny
surface-mount components. In addition to the
resistor divider to set the output voltage value,
only an inductor and two capacitors are required.
Moreover, a low output ripple is guaranteed by the
current mode PWM topology and by the use of
low ESR SMD ceramic capacitors. The device is
available in a very small DFN8 (4 x 4 mm)
package.
= 9 V (typ.)
O
ST8R00
DFN8 4 x 4 mm
Table 1. Device summary
Part number Order code Output voltage
ST8R00 ST8R00WPUR ADJ
February 2012 Doc ID 13449 Rev 2 1/18
www.st.com
18
Contents ST8R00
Contents
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2/18 Doc ID 13449 Rev 2
ST8R00 Block diagram
1 Block diagram
Figure 1. Schematic diagram
LX
LX
Thermal
Thermal
OUT
OUT
INH
INH
IN
IN
Inhibit
Inhibit
V
V
REF
REF
PGND
PGND
PWM Control
PWM Control
FB
FB
GNDPGND
GNDPGND
Doc ID 13449 Rev 2 3/18
Pin configuration ST8R00
2 Pin configuration
Figure 2. Pin connections (top view)
Table 2. Pin description
Pin n° Symbol Name and function
1 LX Switching output
2 PGND Power ground
3 GND Analog ground
4 IN Power input for analog circuit
5 FB Feedback
Inhibit. Connecting the pin to a voltage higher than 2 V = device ON.
6INH
7 HV Trimming (floating or connected to GND)
8 OUT Output voltage
EXP pad GND Exposed pad. Must be connected to GND
Connecting the pin to a voltage lower than 0.8 V = device OFF,
resulting in no current flow to the load
4/18 Doc ID 13449 Rev 2
ST8R00 Typical application circuit
3 Typical application circuit
Figure 3. Application circuit
V
V
I
I
CI=10µF
CI=10µF
L=4.7µH
L=4.7µH
IN LX
IN LX
OUT
OUT
INH
INH
ST8R00
ST8R00
GND PGND
GND PGND
FB
FB
R1
R1
R2
R2
V
V
O
O
CO=10µF
CO=10µF
Doc ID 13449 Rev 2 5/18
Maximum ratings ST8R00
4 Maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
Output voltage 16 V
Input voltage 6 V
Inhibit voltage 6 V
LX pin voltage 16 V
LX pin output current Internally limited
Storage temperature range -50 to 150 °C
Operating junction temperature range -25 to 125 °C
T
V
V
V
V
I
STG
T
O
I
INH
LX
LX
OP
Table 4. Thermal Data
Symbol Parameter Value Unit
R
R
thJC
thJA
Thermal resistance junction-case 10 °C/W
Thermal resistance junction-ambient 50 °C/W
Table 5. ESD Performance
Symbol Parameter Test conditions Value Unit
ESD ESD protection voltage HBM 4 KV
ESD ESD protection voltage MM 500 V
6/18 Doc ID 13449 Rev 2
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