SI9169 Datasheet, PDF (5/8 Pages) Vishay Siliconix – High Frequency 1-A Synchronous Buck/Boost Converter

Si9169
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
PWM Supply Current
800
250
PSM Supply Current
700
200
600
500
150
400
100
300
200
2
3
4
5
6
7
V_DD − (V)
50
2
3
4
5
6
7
V_DD − (V)
PIN CONFIGURATION AND ORDERING INFORMATION
GND
SD
PWM/PSM
V_IN/OUT
V_IN/OUT
V_IN/OUT
SYNC
GND
V_REF
FB
TSSOP-20
1
20
2
19
3
18
4
17
5
16
6 ^Si9169 15
7
14
8
13
9
12
10
11
COIL
COIL
MODE
PGND
PGND
V_S
V_O
V_DD
R_OSC
COMP
ORDERING INFORMATION
Part Number Temperature Range
Package
Si9169BQ-T1
Si9169BQ-T1—E3
Si9169DQ-T1
Si9169DQ-T1—E3
−25 to 85_C
−40 to 85_C
Tape and Reel
Top View
PIN DESCRIPTION
Pin
Symbol
1
2
3
4, 5, 6
GND
SD
PWM/PSM
V_IN/OUT
7
SYNC
8
9
10
11
12
13
14
15
16, 17
18
19, 20
GND
V_REF
FB
COMP
Rosc
V_DD
V_O
V_S
PGND
MODE
COIL
Description
Low power controller ground. Can be left unconnected for load currents below 600 mA.
Shuts down the IC completely and decreases current consumed by the IC to <1 mA.
Logic high = PWM mode, logic low = PSM mode. In PSM mode, synchronous rectification is disabled.
Input node for buck mode and output node for boost mode.
Externally controlled synchronization signal. Logic high to low transition forces the clock synchronization. If not used, the
pin must be connected to V_DD, or logic high.
Low power controller ground
1.3-V reference. Decoupled with 0.1-mF capacitor.
Output voltage feedback connected to the inverting input of an error amplifier.
Error amplifier output for external compensation network.
External resistor to determine the switching frequency.
Input supply voltage for the analog circuitry. Input voltage range is 2.7 V to 6 V.
Direct output voltage sensing to control peak inductor current in PSM mode.
Supply voltage for the internal MOSFET drive circuit.
Power ground.
Determines the converter topology. Connect to AGND for buck or V_DD for boost.
Inductor connection node
Document Number: 70945
S-40695—Rev. D, 19-Apr-04
www.vishay.com
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